/* 全局设计变量：颜色、阴影、圆角在这里集中维护，避免页面里到处写散值。 */
:root {
  --page-bg:
    radial-gradient(circle at 14% -8%, rgba(255, 255, 255, .98) 0%, rgba(255, 255, 255, 0) 38%),
    linear-gradient(135deg, #f8fbff 0%, #edf6ff 44%, #deedff 100%);
  --surface: #ffffff;
  --surface-soft: #f8fbff;
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --primary-soft: #eaf2ff;
  --text-main: #14213d;
  --text-secondary: #64748b;
  --border: #dfe8f3;
  --radius: 8px;
  --shadow-soft: 0 10px 28px rgba(31, 72, 125, 0.07);
  --shadow: 0 14px 34px rgba(31, 72, 125, 0.1);
  --focus-ring: 0 0 0 4px rgba(37, 99, 235, 0.16);
  --container: 1180px;
  --bg: var(--page-bg);
  --card: var(--surface);
  --text: var(--text-main);
  --muted: var(--text-secondary);
  --line: var(--border);
}

/* 基础排版和页面容器。 */
* { box-sizing: border-box; }

html,
body {
  min-height: 100%;
}

body {
  min-height: 100vh;
  margin: 0;
  display: flex;
  flex-direction: column;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--page-bg);
  color: var(--text-main);
  line-height: 1.5;
}

a { color: inherit; text-decoration: none; }

.container { width: min(var(--container), calc(100% - 40px)); margin: 0 auto; }

/* 顶部导航：品牌名在左侧，页面入口紧跟在品牌右侧。 */
.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(223, 232, 243, 0.92);
}

.navbar { display: flex; align-items: center; justify-content: flex-start; gap: 30px; min-height: 72px; }
.brand {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  font-size: 22px;
  letter-spacing: 0;
}
.site-brand { line-height: 1.05; }
.site-logo {
  width: 36px;
  height: 36px;
  flex: 0 0 auto;
  display: block;
  object-fit: contain;
}
.brand-copy { display: grid; gap: 2px; }
.brand-copy strong { color: var(--text-main); font-size: 18px; line-height: 1; }
.brand-copy small {
  color: var(--text-secondary);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.02em;
}
.nav-links { display: flex; gap: 6px; }
.nav-links a {
  padding: 9px 13px;
  border-radius: var(--radius);
  color: var(--text-secondary);
  font-weight: 700;
  transition: background .16s ease, color .16s ease;
}
.nav-links a.active,
.nav-links a:hover { color: var(--primary); background: var(--primary-soft); }
.nav-links .teacher-nav-link {
  position: relative;
  padding-right: 18px;
}
.nav-new-badge {
  position: absolute;
  top: 2px;
  right: 3px;
  color: #dc2626;
  font-size: 9px;
  font-weight: 900;
  line-height: 1;
  letter-spacing: 0;
  text-transform: lowercase;
}
.auth-area { margin-left: auto; display: flex; align-items: center; gap: 10px; }
.auth-avatar {
  width: 40px;
  height: 40px;
  display: grid;
  place-items: center;
  border: 0;
  border-radius: 50%;
  background: var(--primary);
  color: #fff;
  cursor: pointer;
  font-size: 16px;
  font-weight: 900;
  box-shadow: 0 8px 20px rgba(37, 99, 235, 0.22);
}
.auth-avatar:hover { background: var(--primary-dark); }
.auth-avatar { position: relative; overflow: hidden; }
.auth-avatar img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  pointer-events: none;
  user-select: none;
}
.auth-avatar.logged-out {
  background: #eef2f7;
  color: #667085;
  box-shadow: none;
}
.auth-avatar.logged-out:hover { background: #e3e8f0; color: var(--text); }

/* 通用面板。卡片圆角控制在 8px，保持工具型界面的克制感。 */
.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow-soft);
  padding: 24px;
}

/* 首页布局。 */
.page-grid { display: grid; grid-template-columns: 1.2fr 0.8fr; gap: 20px; padding: 28px 0 36px; }
.full-width { grid-column: 1 / -1; }
.hero {
  min-height: 280px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  background: linear-gradient(112deg, #ffffff 0%, #e7f3ff 100%);
}
.hero > p:not(.eyebrow) { max-width: 680px; }
.eyebrow { color: var(--primary); font-weight: 800; letter-spacing: 0.12em; text-transform: uppercase; font-size: 12px; }
h1, h2, h3, p { margin-top: 0; }
h1 { font-size: clamp(34px, 6vw, 52px); line-height: 1.08; letter-spacing: 0; margin-bottom: 16px; }
h2 { margin-bottom: 6px; }
p { color: var(--muted); line-height: 1.8; }

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: fit-content;
  padding: 12px 18px;
  border-radius: 8px;
  background: var(--primary);
  color: white;
  font-weight: 800;
  box-shadow: 0 10px 22px rgba(37, 99, 235, 0.2);
  transition: background .16s ease, border-color .16s ease, color .16s ease, transform .16s ease;
}
.button:hover { background: var(--primary-dark); transform: translateY(-1px); }
.button.secondary {
  border: 1px solid var(--line);
  background: #fff;
  color: var(--primary);
  box-shadow: none;
}
.button.secondary:hover { border-color: var(--primary); background: #f7f9ff; }
.button.compact { padding: 10px 14px; white-space: nowrap; }

/* 区块标题和表单控件。 */
.section-title { display: flex; justify-content: space-between; align-items: flex-start; gap: 16px; margin-bottom: 18px; }
.section-title span { color: var(--muted); font-size: 14px; }
.with-control { align-items: center; }
.section-title h1 { margin-bottom: 6px; font-size: clamp(28px, 4vw, 36px); }

.announcement-list { list-style: none; padding: 0; margin: 0; display: grid; gap: 12px; }
.announcement-list li {
  padding: 14px 16px;
  border-radius: var(--radius);
  background: var(--surface-soft);
  border: 1px solid #e8eff8;
  color: #34455d;
}

.input {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 11px 13px;
  background: white;
  color: var(--text);
  outline: none;
}
.input:focus { border-color: var(--primary); box-shadow: var(--focus-ring); }
.input.small { width: 130px; }
.input,
button,
a {
  -webkit-tap-highlight-color: transparent;
}
a:focus-visible,
button:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 3px;
}
.button:disabled,
button:disabled,
.input:disabled {
  opacity: 0.56;
  cursor: not-allowed;
}
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* 项目卡片和项目列表行。 */
.project-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; }
.project-card, .project-row {
  display: block;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  transition: transform .16s ease, box-shadow .16s ease, border-color .16s ease;
}
.project-card:hover, .project-row:hover { transform: translateY(-2px); box-shadow: var(--shadow); border-color: #bfd3f3; }
.project-card {
  min-height: 270px;
  padding: 18px;
  display: flex;
  flex-direction: column;
}
.project-icon {
  position: relative;
  width: 64px;
  height: 64px;
  display: grid;
  place-items: center;
  overflow: hidden;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--primary-soft);
  color: var(--primary);
  font-weight: 900;
  margin-bottom: 14px;
}
.project-logo-frame::before {
  content: attr(data-logo-text);
  display: block;
  width: calc(100% - 12px);
  overflow: hidden;
  color: inherit;
  line-height: 1;
  text-align: justify;
  text-align-last: justify;
  white-space: nowrap;
}
.project-logo-frame.logo-text-short::before { font-size: 18px; }
.project-logo-frame.logo-text-medium::before { font-size: 13px; }
.project-logo-frame.logo-text-long::before { font-size: 10px; }
.project-logo-frame.has-image::before { content: none; }
.project-icon img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
  object-fit: contain;
  padding: 5px;
  background: #fff;
}
.project-logo-frame.is-failed img { display: none; }
.meta { display: flex; flex-wrap: wrap; gap: 8px; color: var(--muted); font-size: 13px; }
.badge { padding: 5px 9px; border-radius: 8px; background: var(--primary-soft); color: var(--primary-dark); font-weight: 800; }
.cas-tags { display: flex; gap: 6px; margin-top: 12px; }
.project-card > .cas-tags { margin-top: auto; }
.cas-tag {
  min-width: 30px;
  height: 30px;
  display: grid;
  place-items: center;
  border: 1px solid #e2e8f0;
  border-radius: 8px;
  background: #f1f5f9;
  color: #94a3b8;
  font-size: 13px;
  font-weight: 900;
}
.cas-tag.on.creativity { border-color: #cfe2ff; background: #eaf2ff; color: #2563eb; }
.cas-tag.on.activity { border-color: #c7efdd; background: #eafaf1; color: #15803d; }
.cas-tag.on.service { border-color: #e3d6ff; background: #f3edff; color: #7c3aed; }

/* 项目库页面：左侧筛选栏 + 右侧项目列表。 */
.library-layout { display: grid; grid-template-columns: 264px minmax(0, 1fr); gap: 20px; padding: 28px 0 36px; align-items: start; }
.sidebar { position: sticky; top: 92px; display: grid; gap: 10px; }
.sidebar label { font-size: 13px; color: var(--muted); font-weight: 700; margin-top: 6px; }
.category-list { display: grid; gap: 8px; }
.category-button {
  border: 1px solid transparent;
  padding: 10px 12px;
  text-align: left;
  border-radius: 8px;
  background: var(--surface-soft);
  cursor: pointer;
  color: #34455d;
  font-weight: 700;
}
.category-button.active,
.category-button:hover { border-color: #d8e6f8; background: var(--primary-soft); color: var(--primary); }
.category-button[draggable="true"] { cursor: grab; }
.category-button.is-dragging { opacity: 0.55; cursor: grabbing; }

.project-filter-bar,
.resource-filter-bar { padding-top: 20px; }
.project-search-card {
  padding: 6px;
  display: flex;
  align-items: center;
  gap: 6px;
}
.project-search-field {
  min-width: 0;
  min-height: 44px;
  flex: 1;
  padding: 0 13px;
  display: flex;
  align-items: center;
  gap: 9px;
  border: 1px solid transparent;
  border-radius: var(--radius);
  background: var(--surface-soft);
  transition: border-color .16s ease, background .16s ease, box-shadow .16s ease;
}
.project-search-field:focus-within {
  border-color: var(--primary);
  background: #fff;
  box-shadow: var(--focus-ring);
}
.project-search-field img,
.project-filter-toggle img {
  width: 19px;
  height: 19px;
  flex: 0 0 auto;
  opacity: .62;
}
.project-search-field input {
  min-width: 0;
  width: 100%;
  border: 0;
  outline: 0;
  background: transparent;
  color: var(--text-main);
  font: inherit;
}
.project-search-field input::-webkit-search-cancel-button { cursor: pointer; }
.project-filter-toggle {
  position: relative;
  width: 44px;
  min-width: 44px;
  min-height: 44px;
  padding: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 0;
  border-radius: var(--radius);
  background: transparent;
  color: #34455d;
  cursor: pointer;
  font: inherit;
  transition: background .16s ease, color .16s ease;
}
.project-filter-toggle:hover,
.project-filter-toggle.is-open {
  background: var(--primary-soft);
  color: var(--primary);
}
.project-filter-toggle.has-active-filters { color: var(--primary); }
.project-filter-count {
  position: absolute;
  top: 2px;
  right: 1px;
  min-width: 17px;
  height: 17px;
  padding: 0 5px;
  display: inline-grid;
  place-items: center;
  border-radius: 999px;
  background: var(--primary);
  color: #fff;
  font-size: 10px;
  line-height: 1;
}
.project-filter-count[hidden] { display: none; }
.project-advanced-filters {
  margin-top: 10px;
  padding: 22px;
  display: grid;
  grid-template-columns: minmax(280px, .55fr) minmax(0, 1.45fr);
  gap: 24px;
  box-shadow: var(--shadow-soft);
}
.project-filter-options-only { display: block; }
.project-advanced-filters[hidden] { display: none; }
.project-filter-controls {
  max-width: 520px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}
.project-filter-controls label { min-width: 0; }
.project-filter-controls label > span {
  display: block;
  margin-bottom: 7px;
  color: var(--text-secondary);
  font-size: 13px;
  font-weight: 800;
}
.project-filter-controls .input { width: 100%; }
.filter-category-sidebar {
  position: sticky;
  top: 86px;
}
.filter-sidebar-title {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 16px;
}
.filter-sidebar-title h2 { margin: 0; }
.filter-sidebar-title button {
  padding: 2px 0;
  border: 0;
  background: transparent;
  color: var(--primary);
  cursor: pointer;
  font: inherit;
  font-size: 12px;
  font-weight: 800;
}
.filter-sidebar-title button:disabled { color: #a1adbc; cursor: default; }
.project-library-layout { padding: 20px 0 36px; }
.project-library-layout .content-panel { min-width: 0; }
.resource-library-layout { padding: 20px 0 36px; }
.resource-library-layout .resource-panel { min-width: 0; }

.project-list { display: grid; gap: 14px; }
.project-row { padding: 18px; display: grid; grid-template-columns: 72px minmax(0, 1fr); gap: 18px; align-items: start; }
.project-row .project-icon { width: 72px; height: 72px; }
.project-row .project-icon { margin: 0; }
.project-row h3, .project-card h3 { margin: 0 0 8px; }
.project-row p, .project-card p { margin-bottom: 12px; }
.admin-project-row {
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: start;
}
.admin-project-main {
  min-width: 0;
  width: 100%;
  border: 0;
  padding: 0;
  background: transparent;
  display: grid;
  grid-template-columns: 64px minmax(0, 1fr);
  gap: 16px;
  color: inherit;
  text-decoration: none;
  cursor: pointer;
  text-align: left;
}
.admin-project-main:hover h3 { color: var(--primary); }

/* 资源中心复用项目库的紧凑搜索与展开筛选结构。 */
.resource-sidebar {
  position: sticky;
  top: 86px;
}
.resource-sidebar h2, .resource-sidebar h3 { margin-bottom: 0; }
.admin-sidebar-title { display: flex; align-items: baseline; justify-content: space-between; gap: 10px; }
.admin-sidebar-title span { color: var(--muted); font-size: 12px; font-weight: 700; white-space: nowrap; }
.resource-sidebar .category-button { display: flex; align-items: center; gap: 8px; }
.photo-filters {
  display: none;
  margin-top: 12px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
  gap: 10px;
}
.photo-filters.is-visible { display: grid; }
.resource-panel { min-width: 0; }
.is-hidden { display: none; }

.resource-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}
.resource-card {
  display: flex;
  flex-direction: column;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  transition: transform .16s ease, box-shadow .16s ease, border-color .16s ease;
}
.resource-card:hover { transform: translateY(-2px); box-shadow: var(--shadow); border-color: #bfd3f3; }
.resource-summary-card {
  min-height: 112px;
  color: var(--text);
  cursor: pointer;
  font: inherit;
  text-align: left;
  text-decoration: none;
}
.resource-summary-card .resource-body {
  display: flex;
  width: 100%;
  flex-direction: column;
  justify-content: space-between;
  gap: 18px;
}
.resource-summary-card .resource-year {
  color: var(--muted);
  font-size: 14px;
  font-weight: 700;
}
.managed-resource-card { position: relative; cursor: default; }
.resource-card-main {
  min-width: 0;
  width: 100%;
  min-height: 100%;
  padding: 0;
  display: flex;
  flex: 1;
  flex-direction: column;
  border: 0;
  background: transparent;
  color: inherit;
  cursor: pointer;
  font: inherit;
  text-align: left;
  text-decoration: none;
}
.resource-card-admin-actions {
  position: absolute;
  top: 12px;
  right: 12px;
  z-index: 3;
  display: flex;
  gap: 8px;
}
.resource-card-admin-actions .button { box-shadow: 0 3px 12px rgba(12, 40, 74, .18); }
.resource-thumb {
  position: relative;
  display: block;
  height: 160px;
  overflow: hidden;
  background: var(--primary-soft);
}
.resource-thumb img { width: 100%; height: 100%; object-fit: cover; display: block; }
.resource-thumb-placeholder {
  display: block;
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, var(--primary-soft), #dce8f8);
}
.resource-thumb .badge { position: absolute; top: 12px; left: 12px; background: rgba(255, 255, 255, 0.92); }
.resource-detail-video-frame {
  position: relative;
  overflow: hidden;
  background: #05070a;
}
.resource-detail-video {
  width: 100%;
  height: 100%;
  display: block;
  background: #05070a;
  object-fit: contain;
}
.resource-video-fallback {
  position: absolute;
  top: 50%;
  left: 50%;
  z-index: 2;
  padding: 9px 12px;
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.94);
  color: var(--primary-dark);
  font-size: 13px;
  font-weight: 800;
  white-space: nowrap;
  transform: translate(-50%, -50%);
}
.resource-video-fallback.is-hidden { display: none; }
.resource-body { display: grid; gap: 10px; padding: 16px; flex: 1; }
.resource-body h2 { margin: 0; font-size: 18px; }
.resource-body p { margin: 0; color: #52657e; }

.photo-view { display: none; }
.photo-view.is-visible { display: block; }
.yearbook-view { display: none; }
.yearbook-view.is-visible { display: block; }
.yearbook-actions { display: flex; flex-wrap: wrap; gap: 10px; justify-content: flex-end; }
.button.disabled,
.button[aria-disabled="true"] {
  opacity: 0.55;
  cursor: not-allowed;
  pointer-events: none;
}
.yearbook-reader {
  position: relative;
  display: grid;
  align-items: center;
  min-height: 360px;
  padding: 0 58px;
}
.yearbook-pages {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  align-items: start;
}
.yearbook-page {
  min-width: 0;
  margin: 0;
  border: 1px solid var(--line);
  border-radius: 8px;
  overflow: hidden;
  background: var(--surface);
  box-shadow: var(--shadow-soft);
}
.yearbook-page-button {
  width: 100%;
  border: 0;
  padding: 0;
  background: transparent;
  cursor: zoom-in;
}
.yearbook-page-button img {
  width: 100%;
  display: block;
  background: #f7f9ff;
}
.yearbook-page figcaption,
.yearbook-page-placeholder {
  color: var(--muted);
  font-size: 13px;
  font-weight: 700;
  text-align: center;
}
.yearbook-page figcaption { padding: 10px; border-top: 1px solid var(--line); }
.yearbook-page-placeholder {
  min-height: 280px;
  display: grid;
  place-items: center;
  border: 1px dashed var(--line);
  border-radius: 8px;
  background: #f7f9ff;
}
.yearbook-nav {
  position: absolute;
  top: 50%;
  z-index: 1;
  width: 44px;
  height: 72px;
  display: grid;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  color: var(--primary);
  cursor: pointer;
  font-size: 42px;
  line-height: 1;
  box-shadow: var(--shadow);
  transform: translateY(-50%);
}
.yearbook-nav:disabled { opacity: 0.35; cursor: not-allowed; box-shadow: none; }
.yearbook-nav.prev { left: 0; }
.yearbook-nav.next { right: 0; }
.activity-count { margin-left: auto; color: var(--muted); font-size: 12px; font-weight: 700; }
.photo-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 10px;
}
.photo-grid.photo-groups {
  grid-template-columns: 1fr;
  gap: 22px;
}
.photo-grid.photo-activity-cards {
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}
.photo-activity-card {
  width: 100%;
  padding: 0;
  color: var(--text);
  cursor: pointer;
  text-align: left;
}
.photo-activity-card .resource-thumb {
  width: 100%;
}
.photo-activity-card .resource-body {
  display: grid;
}
.photo-activity-section {
  display: grid;
  gap: 12px;
}
.photo-activity-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  border-bottom: 1px solid var(--line);
  padding-bottom: 8px;
}
.photo-activity-head h2 {
  margin: 0;
  font-size: 20px;
}
.photo-activity-head span {
  color: var(--muted);
  font-size: 13px;
  font-weight: 700;
}
.photo-item {
  display: grid;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 8px;
  background: var(--surface);
  color: var(--text);
  cursor: zoom-in;
  text-align: left;
}
.photo-item img {
  width: 100%;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  border-radius: 8px;
  background: #f0f4ff;
}

.photo-modal {
  position: fixed;
  inset: 0;
  z-index: 30;
  display: none;
  padding: 32px;
}
.photo-modal.is-open { display: grid; place-items: center; }
.photo-modal-backdrop { position: absolute; inset: 0; background: rgba(23, 32, 51, 0.72); }
.photo-modal-panel {
  position: relative;
  width: min(980px, 100%);
  max-height: calc(100vh - 64px);
  overflow: auto;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--surface);
  box-shadow: 0 24px 70px rgba(23, 32, 51, 0.3);
}
.photo-modal-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  padding: 16px 18px;
  border-bottom: 1px solid var(--line);
}
.photo-modal-head h2, .photo-modal-head p { margin: 0; }
.photo-modal-head p { color: var(--muted); font-size: 13px; }
.modal-actions { display: flex; align-items: center; gap: 10px; }
.icon-button {
  width: 40px;
  height: 40px;
  display: grid;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  color: var(--text);
  cursor: pointer;
  font-size: 24px;
  line-height: 1;
}
.icon-button:hover { border-color: var(--primary); color: var(--primary); }
.photo-modal-stage {
  position: relative;
  display: grid;
  place-items: center;
  min-height: 240px;
  background: #f7f9ff;
}
.photo-modal-panel img {
  width: 100%;
  max-height: calc(100vh - 160px);
  display: block;
  object-fit: contain;
  background: #f7f9ff;
}
.photo-modal-nav {
  position: absolute;
  top: 50%;
  z-index: 1;
  width: 44px;
  height: 56px;
  display: grid;
  place-items: center;
  border: 1px solid rgba(255, 255, 255, 0.72);
  border-radius: 8px;
  background: rgba(23, 32, 51, 0.62);
  color: #fff;
  cursor: pointer;
  font-size: 42px;
  line-height: 1;
  transform: translateY(-50%);
}
.photo-modal-nav:hover { background: rgba(23, 32, 51, 0.82); }
.photo-modal-nav.prev { left: 14px; }
.photo-modal-nav.next { right: 14px; }

.auth-modal {
  position: fixed;
  inset: 0;
  z-index: 40;
  display: none;
  padding: 28px;
}
.auth-modal.is-open { display: block; }
.auth-backdrop { position: absolute; inset: 0; background: rgba(23, 32, 51, 0.16); backdrop-filter: blur(2px); }
.auth-panel {
  position: absolute;
  top: var(--auth-panel-top, 76px);
  left: var(--auth-panel-left, 16px);
  width: var(--auth-panel-width, min(380px, calc(100vw - 32px)));
  max-height: calc(100vh - var(--auth-panel-top, 76px) - 16px);
  overflow: auto;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.98);
  box-shadow: 0 24px 70px rgba(31, 72, 125, 0.18);
  padding: 16px 18px 18px;
}
.auth-panel.is-account-menu { padding: 0; }
.auth-head { display: grid; gap: 4px; margin-bottom: 14px; }
.auth-head.is-hidden,
.auth-tabs.is-hidden { display: none; }
.auth-head h2, .auth-head p { margin: 0; }
.auth-head h2 { font-size: 22px; line-height: 1.2; }
.auth-head p { color: var(--muted); font-size: 17px; line-height: 1.45; }
.auth-head p span { color: var(--muted); }
.auth-tabs {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin-bottom: 12px;
}
.auth-tab {
  height: 46px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
  color: #5d6678;
  cursor: pointer;
  font-size: 16px;
  font-weight: 800;
}
.auth-tab.active {
  border-color: #aac5ee;
  background: var(--primary-soft);
  color: var(--primary);
}
.auth-tab:hover { border-color: #a8b8ff; color: var(--primary); }
.auth-form { display: grid; gap: 12px; }
.auth-form.is-hidden { display: none; }
.auth-form label { display: grid; }
.auth-form .input {
  height: 40px;
  border-color: #dfe5ef;
  font-size: 16px;
  font-weight: 700;
}
.auth-form .input::placeholder { color: #aab2c0; }
.auth-submit,
.auth-admin-button,
.auth-logout-button {
  width: 100%;
  height: 40px;
  padding: 0 16px;
  font-size: 17px;
  box-shadow: none;
}
.auth-submit { background: var(--primary); }
.auth-submit:hover { background: var(--primary-dark); }
.auth-password-toggle {
  width: fit-content;
  border: 0;
  padding: 0;
  background: transparent;
  color: var(--primary);
  cursor: pointer;
  font: inherit;
  font-size: 16px;
  font-weight: 800;
}
.auth-password-toggle:hover { color: var(--primary-dark); }
.auth-account-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.auth-message {
  min-height: 22px;
  color: #ff3333;
  font-size: 16px;
  line-height: 1.4;
}
.auth-message.error { color: #d92d20; background: transparent; border: 0; }
#authAccountState {
  display: grid;
  gap: 14px;
  margin-top: 24px;
}
#authAccountState:empty { display: none; }
.is-account-menu #authAccountState { gap: 0; margin-top: 0; }
.auth-profile-summary {
  padding: 20px;
  display: grid;
  grid-template-columns: 54px minmax(0, 1fr);
  align-items: center;
  gap: 13px;
  border-bottom: 1px solid var(--border);
  background: linear-gradient(135deg, #f8fbff, #eef5ff);
}
.auth-profile-avatar {
  position: relative;
  width: 54px;
  height: 54px;
  overflow: hidden;
  display: grid;
  place-items: center;
  border: 2px solid #fff;
  border-radius: 50%;
  background: var(--primary);
  color: #fff;
  box-shadow: 0 7px 18px rgba(37, 99, 235, .2);
  font-size: 19px;
  font-weight: 900;
}
.auth-profile-avatar::before { content: attr(data-initial); }
.auth-profile-avatar img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }
.auth-profile-copy { min-width: 0; display: grid; gap: 3px; }
.auth-profile-copy strong { overflow: hidden; color: var(--text-main); font-size: 18px; text-overflow: ellipsis; white-space: nowrap; }
.auth-profile-copy small { overflow: hidden; color: var(--text-secondary); font-size: 13px; text-overflow: ellipsis; white-space: nowrap; }
.auth-account-menu { padding: 8px; display: grid; }
.auth-menu-item {
  width: 100%;
  min-height: 52px;
  padding: 0 12px;
  display: grid;
  grid-template-columns: 24px minmax(0, 1fr) auto;
  align-items: center;
  gap: 12px;
  border: 0;
  border-radius: 9px;
  background: transparent;
  color: #34455d;
  cursor: pointer;
  font: inherit;
  font-size: 15px;
  font-weight: 800;
  text-align: left;
}
.auth-menu-item:hover { background: var(--primary-soft); color: var(--primary); }
.auth-menu-account-button {
  margin: 5px 0;
  border: 1px solid rgba(37, 99, 235, .2);
  background: var(--primary-soft);
  color: var(--primary);
}
.auth-menu-account-button:hover { border-color: rgba(37, 99, 235, .38); background: #dce9ff; }
.auth-menu-item svg {
  width: 22px;
  height: 22px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
}
.auth-menu-arrow { color: #8b98a9; font-size: 26px; font-weight: 400; line-height: 1; }
.auth-menu-logout {
  margin-top: 6px;
  padding-top: 6px;
  border-top: 1px solid var(--border);
  border-radius: 0 0 9px 9px;
}
.auth-menu-logout:hover { color: #d92d20; background: #fff1f0; }
.is-account-menu .auth-account-actions { padding: 12px 20px 16px; border-top: 1px solid var(--border); }
.is-account-menu > .auth-form { margin: 0 20px 16px; }
.is-account-menu > .auth-message { margin: 0 20px 12px; }

/* 项目详情页。 */
.detail-container {
  display: grid;
  gap: 12px;
  padding: 18px 0 0;
}
.detail-breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  min-height: 28px;
  color: var(--text-secondary);
  font-size: 13px;
  font-weight: 700;
}
.detail-breadcrumb a {
  color: var(--text-secondary);
}
.detail-breadcrumb a:hover {
  color: var(--primary);
}
.detail-breadcrumb > * + *::before {
  content: ">";
  margin-right: 8px;
  color: #9aa8bc;
}
.detail-page {
  display: grid;
  gap: 14px;
  padding-bottom: 32px;
}
.detail-hero,
.detail-intro {
  border-color: var(--border);
  box-shadow: var(--shadow-soft);
}
.detail-hero {
  position: relative;
  min-height: 176px;
  display: grid;
  grid-template-columns: 190px minmax(0, 1fr);
  gap: 32px;
  align-items: center;
  overflow: hidden;
  padding: 30px 42px;
  background: linear-gradient(112deg, #ffffff 0%, #e7f3ff 100%);
}
.detail-hero-visual,
.project-visual {
  position: relative;
  width: 142px;
  height: 142px;
  display: grid;
  place-items: center;
  justify-self: center;
  overflow: hidden;
  border: 1px solid rgba(216, 226, 239, 0.92);
  border-radius: 8px;
  background: linear-gradient(150deg, #ffffff, #eef7ff);
  color: #2563eb;
  font-size: 42px;
  font-weight: 900;
  box-shadow: 0 14px 34px rgba(31, 72, 125, 0.1);
}
.member-avatar::before,
.image-frame.is-failed::after {
  content: attr(data-initial);
}
.project-visual.project-logo-frame::before { width: calc(100% - 26px); }
.project-visual.project-logo-frame.logo-text-short::before { font-size: 30px; }
.project-visual.project-logo-frame.logo-text-medium::before { font-size: 23px; }
.project-visual.project-logo-frame.logo-text-long::before { font-size: 17px; }
.project-visual img {
  position: absolute;
  inset: 0;
  z-index: 1;
  width: 100%;
  height: 100%;
  object-fit: contain;
  padding: 12px;
  background: #fff;
}
.project-visual.is-failed img,
.member-avatar.is-failed img {
  display: none;
}
.detail-hero-copy {
  position: relative;
  z-index: 1;
  min-width: 0;
}
.detail-hero-copy h1 {
  margin: 0 0 10px;
  color: var(--text-main);
  font-size: clamp(30px, 4vw, 40px);
  line-height: 1.14;
  letter-spacing: 0;
  overflow-wrap: anywhere;
}
.detail-hero-copy p {
  max-width: 680px;
  margin: 9px 0 0;
  color: #43536b;
  font-size: 16px;
  line-height: 1.75;
}
.detail-hero-meta,
.detail-cas-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
}
.detail-cas-tags {
  margin-top: 12px;
}
.detail-chip {
  display: inline-flex;
  align-items: center;
  min-height: 28px;
  padding: 5px 10px;
  border: 1px solid #dbe7f5;
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.76);
  color: #4b617c;
  font-size: 13px;
  font-weight: 800;
}
.detail-chip.primary {
  border-color: rgba(37, 99, 235, 0.18);
  background: #2563eb;
  color: #fff;
}
.detail-chip.muted {
  background: #f1f5f9;
  color: var(--text-secondary);
}
.detail-chip.cas-creativity {
  border-color: #cfe2ff;
  background: #eaf2ff;
  color: #2563eb;
}
.detail-chip.cas-activity {
  border-color: #c7efdd;
  background: #eafaf1;
  color: #15803d;
}
.detail-chip.cas-service {
  border-color: #e3d6ff;
  background: #f3edff;
  color: #7c3aed;
}
.detail-intro {
  display: grid;
  grid-template-columns: 1fr;
  align-items: center;
  padding: 8px;
  background: var(--surface);
}
.detail-section-copy {
  padding: 14px 20px;
}
.detail-section-copy h2,
.detail-panel-head h2 {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0;
  color: var(--text-main);
  font-size: 20px;
  line-height: 1.3;
}
.detail-section-copy h2 span,
.detail-panel-head h2 span {
  width: 6px;
  height: 6px;
  flex: 0 0 auto;
  border-radius: 50%;
  background: var(--primary);
  box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.1);
}
.detail-section-copy p {
  max-width: 700px;
  margin: 12px 0 0;
  color: #4b5f79;
  line-height: 1.9;
}
.image-frame {
  position: relative;
  overflow: hidden;
  background: #edf5ff;
}
.image-frame.is-failed {
  min-height: 120px;
  display: grid;
  place-items: center;
  color: var(--text-secondary);
  font-size: 13px;
  font-weight: 800;
}
.image-frame.is-failed::after {
  content: "图片暂不可用";
}
.detail-main-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 292px;
  gap: 16px;
  align-items: start;
}
.detail-panel {
  min-width: 0;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface);
  box-shadow: var(--shadow-soft);
}
.feed-panel {
  padding: 12px;
}
.member-panel {
  position: sticky;
  top: 88px;
  padding: 12px;
}
.detail-panel-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
}
.detail-panel-head small {
  height: 30px;
  display: inline-flex;
  align-items: center;
  border: 1px solid #dce7f5;
  border-radius: 8px;
  padding: 0 10px;
  color: var(--text-secondary);
  background: rgba(255, 255, 255, 0.72);
  font-size: 12px;
  font-weight: 800;
}
.detail-panel-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: flex-end;
  gap: 8px;
}
.project-update-modal-panel { width: min(620px, 100%); }
body.modal-open { overflow: hidden; }
.project-update-modal .auth-message { margin: 0; }
.project-update-modal .auth-message:not(.error) { color: var(--text-secondary); }
.project-update-modal.is-submitting .admin-modal-backdrop,
.project-update-modal.is-submitting [data-project-update-close] { cursor: wait; }
.project-update-modal.is-submitting [data-project-update-close] { pointer-events: none; opacity: .55; }
.feed-list,
.member-list {
  display: grid;
  gap: 7px;
}
.feed-card {
  display: grid;
  gap: 8px;
  border: 1px solid #dfe8f3;
  border-radius: 8px;
  padding: 12px;
  background: #fff;
  transition: border-color .16s ease, box-shadow .16s ease, transform .16s ease;
}
.feed-card:hover {
  border-color: #c9daf0;
  box-shadow: 0 10px 24px rgba(31, 72, 125, 0.06);
  transform: translateY(-1px);
}
.feed-card-head {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  min-width: 0;
}
.feed-delete-button {
  margin-left: auto;
  border: 1px solid #f2c7c7;
  border-radius: 7px;
  padding: 6px 9px;
  background: #fff7f7;
  color: #b42318;
  cursor: pointer;
  font: inherit;
  font-size: 12px;
  font-weight: 800;
}
.feed-delete-button:hover { border-color: #d92d20; background: #fff0f0; }
.feed-delete-button:disabled { cursor: wait; opacity: .6; }
.feed-card-head strong,
.member-title strong {
  color: var(--text-main);
  font-weight: 900;
}
.feed-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 3px;
  color: var(--text-secondary);
  font-size: 12px;
  font-weight: 700;
}
.feed-card p {
  margin: 0;
  color: #34455d;
  line-height: 1.72;
  overflow-wrap: anywhere;
}
.member-avatar {
  position: relative;
  width: 42px;
  height: 42px;
  flex: 0 0 auto;
  display: grid;
  place-items: center;
  overflow: hidden;
  border: 1px solid #d8e4f2;
  border-radius: 50%;
  background: linear-gradient(145deg, #eaf2ff, #e9fbf5);
  color: #2563eb;
  font-size: 13px;
  font-weight: 900;
}
.member-avatar img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.feed-avatar {
  width: 40px;
  height: 40px;
}
.feed-media-grid {
  display: grid;
  gap: 8px;
}
.feed-media-grid.single {
  grid-template-columns: 1fr;
}
.feed-media-grid.few {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}
.feed-media-grid.many {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}
.feed-image {
  min-height: 0;
  border-radius: 8px;
  background: #eef6ff;
}
.feed-image img {
  width: 100%;
  height: 100%;
  aspect-ratio: 16 / 9;
  display: block;
  object-fit: cover;
}
.feed-media-grid.single .feed-image img {
  max-height: 220px;
}
.feed-media-grid.few .feed-image img,
.feed-media-grid.many .feed-image img {
  aspect-ratio: 4 / 3;
}
.feed-more {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  background: rgba(20, 33, 61, 0.56);
  color: #fff;
  font-size: 22px;
  font-weight: 900;
}
.feed-video-list {
  display: grid;
  gap: 8px;
}
.feed-video,
.feed-video-link {
  position: relative;
  overflow: hidden;
  border-radius: 8px;
  background: #0f172a;
}
.feed-video video,
.feed-video-link img {
  width: 100%;
  max-height: 230px;
  display: block;
  object-fit: cover;
}
.feed-video span,
.feed-video-link small {
  position: absolute;
  right: 10px;
  bottom: 8px;
  border-radius: 8px;
  padding: 3px 7px;
  background: rgba(15, 23, 42, 0.7);
  color: #fff;
  font-size: 12px;
  font-weight: 800;
}
.play-mark {
  position: absolute;
  left: 50%;
  top: 50%;
  width: 54px;
  height: 54px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.84);
  color: var(--primary);
  font-size: 22px;
  transform: translate(-50%, -50%);
}
.feed-actions {
  display: flex;
  gap: 16px;
  align-items: center;
  border-top: 1px solid #edf2f8;
  padding-top: 4px;
  color: var(--text-secondary);
  font-size: 12px;
  font-weight: 800;
}
.member-card {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  gap: 10px;
  align-items: start;
  border: 1px solid #dfe8f3;
  border-radius: 8px;
  padding: 10px;
  background: rgba(255, 255, 255, 0.9);
}
.member-card.is-collapsed {
  display: none;
}
.member-panel.is-expanded .member-card.is-collapsed {
  display: grid;
}
.member-body {
  min-width: 0;
}
.member-title {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  align-items: center;
}
.member-title span {
  border-radius: 8px;
  padding: 2px 6px;
  background: #eaf2ff;
  color: #2563eb;
  font-size: 11px;
  font-weight: 900;
}
.member-body p {
  margin: 4px 0 0;
  color: var(--text-secondary);
  font-size: 12px;
  line-height: 1.45;
}
.member-contact {
  display: grid;
  gap: 4px;
  margin-top: 6px;
}
.member-contact a,
.member-contact > span {
  color: #52657e;
  font-size: 12px;
  line-height: 1.35;
  overflow-wrap: anywhere;
}
.member-contact a:hover {
  color: var(--primary);
}
.member-more {
  width: 100%;
  height: 36px;
  margin-top: 12px;
  border: 1px solid #cfe0f5;
  border-radius: 8px;
  background: #f8fbff;
  color: var(--primary);
  cursor: pointer;
  font-weight: 900;
}
.member-more:hover {
  border-color: #aecaef;
  background: #eef6ff;
}
.detail-empty {
  background: rgba(248, 251, 255, 0.84);
}
.detail-state {
  display: grid;
  gap: 12px;
  justify-items: start;
  margin-top: 8px;
}
.detail-state.is-hidden { display: none; }
.detail-state h1,
.detail-state p {
  margin: 0;
}
.skeleton-line {
  height: 14px;
  border-radius: 8px;
  background: linear-gradient(90deg, #eef4fb, #f9fbff, #eef4fb);
}
.skeleton-line.short {
  width: 120px;
}
.skeleton-line.medium {
  width: 50%;
}
.skeleton-line.title {
  width: 72%;
  height: 34px;
}
.detail-hero.is-loading .detail-hero-copy {
  display: grid;
  gap: 14px;
}
.media-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; margin-top: 12px; }
.media-grid img { width: 100%; border-radius: 8px; border: 1px solid var(--line); object-fit: cover; max-height: 280px; }
.link-card { display: block; padding: 14px; border: 1px solid var(--line); border-radius: 8px; color: var(--primary); word-break: break-all; }
.site-footer {
  margin-top: auto;
  border-top: 1px solid var(--border);
  background: var(--surface);
  color: var(--text-secondary);
}
.site-footer-inner {
  min-height: 62px;
  display: flex;
  align-items: center;
  gap: 24px;
}
.site-footer .site-logo {
  width: 28px;
  height: 28px;
}
.site-footer .brand-copy strong { font-size: 14px; }
.site-footer .brand-copy small { font-size: 9px; }
.site-footer .site-brand {
  gap: 8px;
}
.site-footer-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 8px 16px;
  margin-left: auto;
}
.site-footer-links a {
  color: var(--text-secondary);
  font-size: 13px;
  font-weight: 700;
}
.site-footer-links a:hover { color: var(--primary); }
.site-footer-copy {
  margin: 0;
  padding: 0;
  color: #8a98ac;
  font-size: 12px;
  white-space: nowrap;
}
.empty { color: var(--muted); padding: 26px; text-align: center; border: 1px dashed #ccd4e5; border-radius: 8px; }
.error { color: #b42318; background: #fff1f0; border-color: #ffd4d1; }
.error-text { color: #b42318 !important; }

@media (max-width: 900px) {
  .detail-container {
    width: min(100% - 32px, 760px);
  }
  .detail-hero {
    grid-template-columns: 1fr;
    gap: 22px;
    padding: 26px;
  }
  .detail-hero-visual,
  .project-visual {
    justify-self: start;
    width: 132px;
    height: 132px;
  }
  .detail-intro,
  .detail-main-grid {
    grid-template-columns: 1fr;
  }
  .detail-section-copy {
    padding: 14px;
  }
  .member-panel {
    position: static;
  }
}

@media (max-width: 600px) {
  .detail-container {
    width: min(100% - 24px, 100%);
  }
  .detail-hero {
    padding: 20px;
  }
  .detail-hero-copy h1 {
    font-size: 28px;
  }
  .detail-hero-visual,
  .project-visual {
    width: 112px;
    height: 112px;
    font-size: 34px;
  }
  .project-visual img {
    padding: 12px;
  }
  .feed-panel,
  .member-panel {
    padding: 10px;
  }
  .feed-card,
  .member-card {
    padding: 10px;
  }
  .feed-media-grid.few,
  .feed-media-grid.many {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .feed-media-grid.single .feed-image img {
    max-height: 240px;
  }
}

/* 管理后台。后台是高频操作界面，布局以表格和表单为主。 */
.admin-shell {
  min-height: 100vh;
  display: grid;
  grid-template-columns: 248px minmax(0, 1fr);
  background: var(--page-bg);
}
.admin-sidebar {
  position: sticky;
  top: 0;
  height: 100vh;
  display: flex;
  flex-direction: column;
  gap: 18px;
  padding: 22px;
  border-right: 1px solid var(--border);
  background: var(--surface);
}
.admin-brand { font-size: 21px; }
.admin-nav { display: grid; gap: 8px; }
.admin-nav-item {
  width: 100%;
  border: 0;
  border-radius: 8px;
  padding: 12px 14px;
  border: 1px solid transparent;
  background: transparent;
  color: #465062;
  cursor: pointer;
  text-align: left;
  font-size: 15px;
  font-weight: 800;
}
.admin-nav-item.active,
.admin-nav-item:hover {
  border-color: #d8e6f8;
  background: var(--primary-soft);
  color: var(--primary);
}
.admin-home-link { margin-top: auto; width: 100%; }
.admin-main { min-width: 0; padding: 28px; }
.admin-topbar {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 16px;
  margin-bottom: 18px;
}
.admin-topbar h1 { margin-bottom: 6px; font-size: 30px; line-height: 1.1; }
.admin-topbar p { margin: 0; }
.admin-gate { max-width: 560px; }
.admin-workspace { display: grid; gap: 18px; }
.admin-view { display: none; min-width: 0; }
.admin-view.active { display: grid; gap: 16px; }
.admin-transfer-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  align-items: start;
}
.admin-transfer-card {
  display: grid;
  gap: 14px;
  padding: 22px;
}
.admin-transfer-card h3,
.admin-transfer-card p { margin: 0; }
.admin-transfer-card > p {
  color: var(--text-secondary);
  line-height: 1.7;
}
.admin-transfer-file {
  display: grid;
  gap: 8px;
  color: var(--text-main);
  font-weight: 800;
}
.admin-transfer-result {
  min-height: 92px;
  padding: 14px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface-soft);
}
.admin-transfer-result > p { margin: 0; }
.admin-transfer-summary {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 8px;
}
.admin-transfer-summary span {
  display: grid;
  gap: 2px;
  padding: 10px;
  border-radius: 8px;
  background: #fff;
  color: var(--text-secondary);
  font-size: 12px;
}
.admin-transfer-summary strong {
  color: var(--text-main);
  font-size: 20px;
}
.admin-transfer-warning {
  margin: 12px 0 0;
  padding: 12px 12px 12px 30px;
  border: 1px solid #f5d38a;
  border-radius: 8px;
  background: #fff9e8;
  color: #8a5a00;
  font-size: 13px;
  line-height: 1.6;
}
.admin-transfer-error {
  color: #b42318;
  white-space: pre-wrap;
}
.admin-transfer-success {
  color: #166534;
  font-weight: 800;
}
.admin-section-head {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 16px;
}
.admin-section-head h2,
.admin-section-head h3,
.admin-section-head p { margin: 0; }
.admin-section-head p { margin-top: 4px; font-size: 14px; }
.compact-head h3 { font-size: 20px; }
.admin-toolbar { display: flex; align-items: center; gap: 10px; min-width: 0; }
.admin-toolbar .input:not(.small) { max-width: 360px; }
.admin-muted { color: var(--muted); font-size: 14px; margin-right: auto; }
.admin-resource-layout { align-items: start; }
.admin-table-wrap {
  min-width: 0;
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
}
.admin-table { width: 100%; border-collapse: collapse; min-width: 720px; }
.admin-table th,
.admin-table td {
  padding: 11px 12px;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
  font-size: 14px;
}
.admin-table th { background: var(--surface-soft); color: #465062; font-weight: 900; }
.admin-table tr:last-child td { border-bottom: 0; }
.admin-table td:last-child { white-space: nowrap; }
.admin-table tbody tr:hover { background: #f7fbff; }
.admin-sortable-list {
  display: grid;
  gap: 8px;
}
.admin-sortable-list-items {
  display: grid;
  gap: 8px;
}
.admin-sortable-list-item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  gap: 8px;
  align-items: center;
}
.admin-sortable-list-item.is-dragging { opacity: 0.55; }
.admin-sortable-list-handle {
  color: var(--muted);
  font-size: 12px;
  font-weight: 800;
  cursor: grab;
  white-space: nowrap;
}
.admin-media-toolbar {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 10px;
}
.admin-media-toolbar h2 {
  margin: 0;
  margin-right: auto;
}
.admin-media-note {
  color: var(--muted);
  font-size: 12px;
  font-weight: 800;
}
.admin-project-member-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 10px;
}
.admin-project-member-card {
  display: grid;
  gap: 7px;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface-soft);
}
.admin-project-member-card > div {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}
.admin-project-member-card p,
.admin-project-member-card small { margin: 0; color: var(--muted); overflow-wrap: anywhere; }
.admin-project-member-card > div span { color: var(--primary); font-size: 12px; font-weight: 800; }
.admin-project-member-binding {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding-top: 8px;
  border-top: 1px solid var(--line);
}
.admin-form-note { margin: 0; color: var(--muted); font-size: 13px; line-height: 1.55; }
.admin-member-editor-list { display: grid; gap: 10px; }
.admin-member-editor-item {
  display: grid;
  grid-template-columns: minmax(130px, 1.1fr) 100px 110px minmax(150px, 1fr) auto;
  gap: 8px;
  align-items: end;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface-soft);
}
.admin-member-editor-item label { min-width: 0; }
.admin-project-update-list,
.admin-project-update-editor-list {
  display: grid;
  gap: 12px;
}
.admin-project-update-card {
  display: grid;
  gap: 10px;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface-soft);
}
.admin-project-update-card p {
  margin: 0;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}
.admin-project-update-card p span,
.admin-project-update-card small { color: var(--muted); }
.admin-project-update-photos {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(90px, 1fr));
  gap: 8px;
}
.admin-project-update-photos img {
  width: 100%;
  aspect-ratio: 1;
  object-fit: cover;
  border-radius: 7px;
  border: 1px solid var(--line);
}
.admin-project-update-photos span {
  display: grid;
  place-items: center;
  min-height: 90px;
  border-radius: 7px;
  background: #e9f1ff;
  color: var(--primary);
  font-weight: 800;
}
.admin-project-update-editor-item {
  align-items: start;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface-soft);
}
.admin-project-update-editor-fields {
  display: grid;
  gap: 12px;
  min-width: 0;
}
.admin-project-update-editor-fields label { min-width: 0; }
.admin-project-update-editor-fields textarea { resize: vertical; }
.admin-project-update-editor-item > .danger { margin-top: 24px; }
.admin-project-update-editor-item.is-dragging {
  opacity: 0.55;
}
.admin-card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 16px;
}
.admin-content-card {
  display: grid;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  transition: border-color .16s ease, box-shadow .16s ease, transform .16s ease;
}
.admin-content-card:hover { border-color: #bfd3f3; box-shadow: var(--shadow-soft); transform: translateY(-1px); }
.admin-card-cover {
  width: 100%;
  border: 0;
  padding: 0;
  background: #f0f4ff;
  cursor: pointer;
}
.admin-card-cover img {
  width: 100%;
  aspect-ratio: 16 / 9;
  display: block;
  object-fit: cover;
}
.admin-card-body {
  display: grid;
  gap: 10px;
  padding: 14px;
}
.admin-card-body h3,
.admin-card-body p { margin: 0; }
.admin-card-button {
  width: 100%;
  border: 0;
  background: transparent;
  color: var(--text);
  cursor: pointer;
  text-align: left;
}
.admin-detail-panel {
  display: grid;
  gap: 18px;
  box-shadow: none;
}
.admin-detail-panel.is-hidden { display: none; }
.admin-detail-head {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: flex-start;
}
.admin-detail-head h2,
.admin-detail-head p { margin: 0; }
.admin-detail-actions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}
.admin-detail-grid {
  display: grid;
  grid-template-columns: minmax(240px, 380px) minmax(0, 1fr);
  gap: 18px;
}
.admin-detail-image {
  width: 100%;
  border-radius: 8px;
  border: 1px solid var(--line);
  object-fit: cover;
  aspect-ratio: 16 / 10;
  background: #f0f4ff;
}
.admin-detail-list {
  display: grid;
  gap: 10px;
  margin: 0;
}
.admin-detail-list div {
  display: grid;
  grid-template-columns: 92px minmax(0, 1fr);
  gap: 12px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
}
.admin-detail-list dt {
  color: var(--muted);
  font-weight: 800;
}
.admin-detail-list dd {
  margin: 0;
  min-width: 0;
}
.button.danger { color: #b42318; }
.button.danger:hover { border-color: #fda29b; background: #fff1f0; }
.admin-split {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(340px, 0.9fr);
  gap: 16px;
  align-items: start;
}
.admin-photo-panel { display: grid; gap: 14px; box-shadow: none; }
.admin-url-cell {
  display: inline-block;
  max-width: 320px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.admin-file-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 300px;
  gap: 16px;
  align-items: start;
}
.admin-file-panel,
.admin-upload-panel {
  display: grid;
  gap: 12px;
  box-shadow: none;
}
.admin-file-action {
  display: grid;
  gap: 8px;
}
.admin-file-action + .admin-file-action {
  border-top: 1px solid var(--border);
  padding-top: 14px;
}
.admin-file-action h3,
.admin-file-action p { margin: 0; }
.admin-file-target {
  overflow-wrap: anywhere;
  color: var(--primary-dark);
  font-weight: 800;
}
.admin-link-button {
  border: 0;
  padding: 0;
  background: transparent;
  color: var(--primary);
  cursor: pointer;
  font: inherit;
  font-weight: 800;
}
.admin-link-button:hover { color: var(--primary-dark); }
.admin-modal {
  position: fixed;
  inset: 0;
  z-index: 60;
  display: none;
  padding: 24px;
}
.admin-modal.is-open { display: grid; place-items: center; }
.admin-modal-backdrop { position: absolute; inset: 0; background: rgba(23, 32, 51, 0.28); }
.admin-modal-panel {
  position: relative;
  width: min(720px, 100%);
  max-height: calc(100vh - 48px);
  overflow: auto;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  box-shadow: 0 24px 70px rgba(23, 32, 51, 0.2);
}
.admin-file-picker-panel {
  width: min(1080px, calc(100vw - 48px));
}
.admin-file-picker-panel .admin-table-wrap {
  max-height: min(620px, calc(100vh - 220px));
  overflow: auto;
}
.admin-file-picker-panel .admin-table {
  min-width: 880px;
}
.admin-modal-head {
  position: sticky;
  top: 0;
  z-index: 1;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  padding: 16px;
  border-bottom: 1px solid var(--line);
  background: var(--surface);
}
.admin-modal-head h2 { margin: 0; font-size: 22px; }
.admin-form { display: grid; gap: 14px; padding: 16px; }
.admin-form label {
  display: grid;
  gap: 6px;
  color: #465062;
  font-size: 13px;
  font-weight: 800;
}
.admin-form textarea.input { resize: vertical; min-height: 96px; }
.admin-check {
  display: flex !important;
  grid-template-columns: none;
  align-items: center;
  gap: 10px !important;
}
.admin-input-row { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 8px; }
.admin-modal-actions { display: flex; justify-content: flex-end; gap: 10px; padding-top: 4px; }
.admin-report-context-panel { width: min(760px, 100%); }
.admin-report-context { display: grid; gap: 12px; padding: 16px; }
.admin-report-reason { margin: 0; padding: 12px; border-radius: 12px; background: var(--surface-soft); }
.admin-report-message-list { display: grid; gap: 8px; }
.admin-report-message {
  display: grid;
  gap: 4px;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--surface);
}
.admin-report-message.reported {
  border-color: var(--danger);
  box-shadow: 0 0 0 2px rgba(194, 62, 62, 0.12);
}
.admin-report-message header { display: flex; justify-content: space-between; gap: 12px; color: var(--text-secondary); font-size: 12px; }
.admin-report-message p { margin: 0; white-space: pre-wrap; overflow-wrap: anywhere; }

/* 移动端布局：导航换行，筛选栏和内容改为单列。 */
@media (max-width: 820px) {
  .container { width: min(var(--container), calc(100% - 28px)); }
  .navbar { flex-wrap: wrap; gap: 10px 16px; min-height: 0; padding: 12px 0; }
  .navbar > .site-brand { order: 1; }
  .navbar > .auth-area { order: 2; width: auto; margin-left: auto; }
  .navbar > .nav-links {
    order: 3;
    width: 100%;
    overflow-x: auto;
    scrollbar-width: none;
  }
  .navbar > .nav-links > a { flex: 0 0 auto; white-space: nowrap; }
  .navbar > .nav-links::-webkit-scrollbar { display: none; }
  .auth-user { text-align: left; }
  .page-grid, .library-layout { grid-template-columns: 1fr; padding-top: 20px; }
  .project-grid, .resource-grid, .photo-grid.photo-activity-cards { grid-template-columns: 1fr; }
  .yearbook-actions { justify-content: flex-start; }
  .yearbook-reader { padding: 56px 0 0; }
  .yearbook-pages { grid-template-columns: 1fr; }
  .yearbook-page-placeholder { min-height: 120px; }
  .yearbook-nav {
    top: 0;
    width: 48px;
    height: 44px;
    font-size: 34px;
    transform: none;
  }
  .yearbook-nav.prev { left: 0; }
  .yearbook-nav.next { right: 0; }
  .sidebar { position: static; }
  .project-advanced-filters { grid-template-columns: 1fr; }
  .project-row { grid-template-columns: 64px minmax(0, 1fr); }
  .project-row .project-icon { width: 64px; height: 64px; }
  .admin-project-row { grid-template-columns: 1fr; }
  .admin-project-main { grid-template-columns: 64px minmax(0, 1fr); }
  .media-grid { grid-template-columns: 1fr; }
  .photo-modal { padding: 16px; }
  .photo-modal-head { align-items: flex-start; flex-direction: column; }
  .admin-shell {
    width: 100%;
    max-width: 100vw;
    grid-template-columns: minmax(0, 1fr);
    overflow-x: clip;
  }
  .admin-sidebar {
    position: static;
    width: 100%;
    min-width: 0;
    height: auto;
    padding: 16px;
    overflow: hidden;
  }
  .admin-nav {
    width: 100%;
    min-width: 0;
    max-width: 100%;
    display: flex;
    overflow-x: auto;
  }
  .admin-nav-item { white-space: nowrap; }
  .admin-main {
    width: 100%;
    min-width: 0;
    max-width: 100vw;
    padding: 16px;
    overflow: hidden;
  }
  .admin-table-wrap { max-width: 100%; }
  .admin-topbar,
  .admin-section-head,
  .admin-toolbar {
    align-items: stretch;
    flex-direction: column;
  }
  .admin-toolbar .input:not(.small),
  .admin-toolbar .input.small {
    max-width: none;
    width: 100%;
  }
  .admin-split,
  .admin-file-layout,
  .admin-detail-grid { grid-template-columns: 1fr; }
  .admin-detail-head { flex-direction: column; }
  .admin-input-row { grid-template-columns: 1fr; }
  .admin-member-editor-item { grid-template-columns: 1fr; align-items: stretch; }
  .admin-project-update-editor-item { grid-template-columns: 1fr; }
  .admin-project-update-editor-item > .danger { margin-top: 0; }
  .site-footer-inner {
    min-height: 0;
    padding: 14px 0;
    align-items: center;
    flex-wrap: wrap;
    gap: 10px 16px;
  }
  .site-footer-links {
    order: 3;
    width: 100%;
    margin-left: 0;
    justify-content: flex-start;
  }
  .site-footer-copy { margin-left: auto; }
}

@media (max-width: 600px) {
  .card { padding: 20px; }
  .hero { min-height: 250px; }
  .page-grid { gap: 14px; }
  .library-layout { gap: 14px; }
  .project-filter-bar,
  .resource-filter-bar { padding-top: 14px; }
  .project-search-card { padding: 5px; }
  .project-search-field { min-height: 42px; padding: 0 11px; }
  .project-filter-toggle { width: 42px; min-width: 42px; min-height: 42px; }
  .project-advanced-filters { padding: 18px; gap: 18px; }
  .project-library-layout,
  .resource-library-layout { padding-top: 14px; }
  .project-row {
    grid-template-columns: 1fr;
    gap: 14px;
  }
  .project-row .project-icon { width: 72px; height: 72px; }
  .admin-project-main { grid-template-columns: 1fr; }
  .site-footer-links { gap: 8px 16px; }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
}

/* 用户系统与消息中心。 */
.message-nav-link {
  position: relative;
  width: 40px;
  height: 40px;
  flex: 0 0 auto;
  display: grid;
  place-items: center;
  border-radius: 50%;
  color: var(--text-secondary);
  transition: background .16s ease, color .16s ease;
}
.message-nav-link:hover,
.message-nav-link.active { background: var(--primary-soft); color: var(--primary); }
.message-nav-link:focus-visible { outline: 0; box-shadow: var(--focus-ring); }
.message-nav-link svg {
  width: 23px;
  height: 23px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
}
.message-nav-badge {
  position: absolute;
  top: -3px;
  right: -4px;
  min-width: 17px;
  height: 17px;
  padding: 0 4px;
  display: grid;
  place-items: center;
  border: 2px solid #fff;
  border-radius: 999px;
  background: #ef4444;
  color: #fff;
  font-size: 10px;
  line-height: 1;
}
.message-nav-badge.is-hidden { display: none; }
.messages-page { overflow: hidden; }
.messages-shell { flex: 1; min-height: 0; padding: 22px 0; }
.messages-gate { max-width: 560px; margin: 72px auto; text-align: center; }
.messages-gate h1 { margin-top: 0; }
.messages-app {
  height: calc(100vh - 116px);
  min-height: 560px;
  display: grid;
  grid-template-columns: 170px minmax(0, 1fr);
  overflow: hidden;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: #fff;
  box-shadow: var(--shadow-soft);
}
.messages-app.is-hidden { display: none; }
.message-center-nav {
  min-width: 0;
  border-right: 1px solid var(--border);
  background: #f8fbff;
}
.message-center-brand { min-height: 84px; padding: 19px 18px; border-bottom: 1px solid var(--border); }
.message-center-brand h1,
.message-center-brand p { margin: 0; }
.message-center-brand h1 { margin-top: 2px; font-size: 21px; }
.message-center-brand .eyebrow,
.message-activity-head .eyebrow { color: var(--primary); font-size: 10px; }
.message-center-nav nav { padding: 12px 9px; display: grid; gap: 5px; }
.message-center-nav-item {
  position: relative;
  width: 100%;
  min-height: 44px;
  padding: 10px 9px;
  display: grid;
  grid-template-columns: 20px minmax(0, 1fr) auto;
  gap: 8px;
  align-items: center;
  border: 0;
  border-radius: 8px;
  background: transparent;
  color: #52647c;
  cursor: pointer;
  text-align: left;
  font: inherit;
  font-size: 13px;
  font-weight: 800;
}
.message-center-nav-item:hover { background: #eef5ff; color: var(--primary); }
.message-center-nav-item.active { background: var(--primary-soft); color: var(--primary); }
.message-center-nav-item svg {
  width: 20px;
  height: 20px;
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 1.8;
}
.message-center-nav-item b {
  min-width: 19px;
  height: 19px;
  padding: 0 5px;
  display: grid;
  place-items: center;
  border-radius: 999px;
  background: #ef4444;
  color: #fff;
  font-size: 10px;
}
.message-center-nav-item b.is-hidden { display: none; }
.message-center-content { min-width: 0; min-height: 0; }
.direct-messages-view { height: 100%; min-height: 0; display: grid; grid-template-columns: 310px minmax(0, 1fr); }
.direct-messages-view.is-hidden { display: none; }
.conversation-sidebar {
  min-width: 0;
  display: flex;
  flex-direction: column;
  border-right: 1px solid var(--border);
  background: #fbfdff;
}
.conversation-sidebar-head {
  min-height: 84px;
  padding: 18px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--border);
}
.conversation-sidebar-head h2,
.conversation-sidebar-head p { margin: 0; }
.conversation-sidebar-head h2 { font-size: 21px; }
.conversation-sidebar-head .eyebrow { color: var(--primary); font-size: 11px; }
.icon-button {
  width: 38px;
  height: 38px;
  border: 1px solid var(--border);
  border-radius: 50%;
  background: #fff;
  color: var(--primary);
  cursor: pointer;
  font-size: 24px;
  line-height: 1;
}
.icon-button:hover { background: var(--primary-soft); }
.user-search-panel { padding: 12px; border-bottom: 1px solid var(--border); }
.user-search-panel label { display: block; margin-bottom: 6px; color: var(--text-secondary); font-size: 12px; font-weight: 800; }
.message-user-results { max-height: 230px; margin-top: 8px; overflow-y: auto; }
.message-user-results > p { margin: 10px 4px; color: var(--text-secondary); font-size: 13px; }
.message-user-result {
  width: 100%;
  padding: 9px;
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr) auto;
  gap: 10px;
  align-items: center;
  border: 0;
  border-radius: 8px;
  background: transparent;
  text-align: left;
  cursor: pointer;
}
.message-user-result:hover { background: #eef5ff; }
.message-user-result span:nth-child(2) { min-width: 0; display: grid; }
.message-user-result small { color: var(--text-secondary); }
.verified-dot { color: var(--primary); font-weight: 900; }
.conversation-list { min-height: 0; flex: 1; padding: 8px; overflow-y: auto; }
.conversation-empty { padding: 42px 20px; color: var(--text-secondary); text-align: center; font-size: 14px; }
.conversation-item {
  position: relative;
  width: 100%;
  padding: 12px;
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr);
  gap: 11px;
  align-items: center;
  border: 0;
  border-radius: 9px;
  background: transparent;
  color: inherit;
  text-align: left;
  cursor: pointer;
}
.conversation-item:hover { background: #f1f6fc; }
.conversation-item.active { background: var(--primary-soft); }
.user-avatar,
.message-avatar {
  position: relative;
  width: 44px;
  height: 44px;
  overflow: hidden;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: linear-gradient(145deg, #dbeafe, #eff6ff);
  color: var(--primary);
  font-weight: 900;
}
.user-avatar::before,
.message-avatar::before { content: attr(data-initial); }
.user-avatar img,
.message-avatar img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }
.conversation-copy { min-width: 0; display: grid; gap: 3px; }
.conversation-title { display: flex; align-items: center; gap: 8px; }
.conversation-title strong { min-width: 0; flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.conversation-title time { color: #94a3b8; font-size: 11px; }
.conversation-preview { overflow: hidden; color: var(--text-secondary); font-size: 13px; text-overflow: ellipsis; white-space: nowrap; }
.conversation-unread {
  position: absolute;
  right: 11px;
  bottom: 10px;
  min-width: 18px;
  height: 18px;
  padding: 0 5px;
  display: grid;
  place-items: center;
  border-radius: 999px;
  background: #ef4444;
  color: #fff;
  font-size: 10px;
}
.chat-panel { min-width: 0; min-height: 0; background: #f7f9fc; }
.chat-empty { height: 100%; display: grid; align-content: center; justify-items: center; padding: 30px; text-align: center; }
.chat-empty.is-hidden,
.chat-active.is-hidden { display: none; }
.chat-empty h2 { margin: 18px 0 5px; }
.chat-empty p { margin: 0; color: var(--text-secondary); }
.chat-empty-mark {
  width: 72px;
  height: 72px;
  display: grid;
  place-items: center;
  border-radius: 24px;
  background: var(--primary-soft);
  color: var(--primary);
  font-size: 30px;
  font-weight: 900;
}
.chat-active { height: 100%; min-height: 0; display: grid; grid-template-rows: auto minmax(0, 1fr) auto; }
.chat-head {
  min-height: 72px;
  padding: 12px 22px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--border);
  background: #fff;
}
.mobile-chat-back {
  display: none;
  border: 0;
  background: transparent;
  color: var(--primary);
  cursor: pointer;
  font-size: 30px;
}
.chat-user { display: flex; align-items: center; gap: 11px; }
.chat-user > span:last-child { display: grid; }
.chat-user small { color: var(--text-secondary); }
.text-button {
  padding: 6px;
  border: 0;
  background: transparent;
  color: var(--text-secondary);
  cursor: pointer;
}
.text-button:hover { color: var(--primary); }
.text-button.danger:hover { color: #dc2626; }
.message-list { min-height: 0; padding: 24px clamp(18px, 4vw, 54px); overflow-y: auto; }
.message-day-tip { margin: 10px auto; color: #94a3b8; font-size: 12px; text-align: center; }
.message-row { margin: 15px 0; display: flex; align-items: flex-start; gap: 10px; }
.message-row.own { justify-content: flex-end; }
.message-avatar { width: 36px; height: 36px; flex: 0 0 auto; font-size: 13px; }
.message-bubble-wrap { max-width: min(68%, 620px); }
.message-bubble {
  padding: 10px 13px;
  border: 1px solid var(--border);
  border-radius: 4px 14px 14px 14px;
  background: #fff;
  box-shadow: 0 3px 10px rgba(30, 64, 110, 0.04);
}
.message-row.own .message-bubble {
  border-color: #bcd5ff;
  border-radius: 14px 4px 14px 14px;
  background: #dfeeff;
}
.message-bubble p { margin: 0; white-space: pre-wrap; overflow-wrap: anywhere; }
.message-bubble.recalled { color: #94a3b8; font-size: 13px; font-style: italic; }
.message-meta { min-height: 20px; display: flex; justify-content: flex-end; gap: 8px; color: #94a3b8; font-size: 10px; }
.message-meta button { padding: 0; border: 0; background: transparent; color: #94a3b8; cursor: pointer; }
.message-meta button:hover { color: var(--primary); }
.message-project-card { min-width: 220px; display: grid; gap: 3px; }
.message-project-card span { color: var(--text-secondary); font-size: 12px; }
.message-composer { padding: 14px 20px; border-top: 1px solid var(--border); background: #fff; }
.composer-project-share {
  margin-bottom: 8px;
  padding: 9px 11px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  border: 1px solid #bcd5ff;
  border-radius: 8px;
  background: #f4f8ff;
}
.composer-project-share.is-hidden { display: none; }
.composer-project-share span { display: grid; }
.composer-project-share small { color: var(--text-secondary); }
.composer-project-share button { border: 0; background: transparent; color: var(--text-secondary); cursor: pointer; font-size: 22px; }
.message-composer textarea {
  width: 100%;
  min-height: 68px;
  max-height: 150px;
  padding: 8px;
  resize: vertical;
  border: 0;
  outline: none;
  color: var(--text-main);
  font: inherit;
}
.message-composer-foot { display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.message-composer-foot span { color: var(--text-secondary); font-size: 12px; }
.message-activity-view { height: 100%; min-height: 0; display: grid; grid-template-rows: auto minmax(0, 1fr) auto; background: #fff; }
.message-activity-view.is-hidden { display: none; }
.message-activity-head {
  min-height: 84px;
  padding: 18px 24px;
  display: flex;
  align-items: center;
  border-bottom: 1px solid var(--border);
}
.message-activity-head h2,
.message-activity-head p { margin: 0; }
.message-activity-head h2 { margin-top: 3px; font-size: 22px; }
.message-activity-list { min-height: 0; overflow-y: auto; }
.message-activity-empty { padding: 72px 24px; color: var(--text-secondary); text-align: center; }
.message-activity-item {
  min-height: 92px;
  padding: 18px 24px;
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr) auto;
  gap: 13px;
  align-items: center;
  border-bottom: 1px solid #edf1f6;
  color: inherit;
}
a.message-activity-item:hover { background: #f8fbff; }
.message-activity-item.unread { background: #fbfdff; }
.message-activity-item.unread .message-activity-copy::before {
  position: absolute;
  top: 3px;
  left: -9px;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--primary);
  content: '';
}
.message-activity-copy { position: relative; min-width: 0; display: grid; gap: 5px; }
.message-activity-copy p { margin: 0; color: #334155; line-height: 1.55; overflow-wrap: anywhere; }
.message-activity-copy p strong { color: var(--text-main); }
.message-activity-copy small { color: var(--text-secondary); line-height: 1.45; }
.message-activity-copy time { color: #94a3b8; font-size: 11px; }
.message-activity-target {
  max-width: 190px;
  overflow: hidden;
  color: var(--text-secondary);
  font-size: 12px;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.message-activity-item.disabled { background: #fafafa; color: #94a3b8; }
.message-activity-item.disabled .message-activity-copy p { color: #94a3b8; }
.message-activity-more { min-height: 54px; padding: 10px; display: flex; justify-content: center; border-top: 1px solid var(--border); }
.profile-layout,
.public-profile-wrap { padding-top: 32px; padding-bottom: 56px; }
.profile-grid { display: grid; grid-template-columns: 280px minmax(0, 1fr); gap: 22px; align-items: start; }
.profile-summary { position: sticky; top: 104px; display: grid; justify-items: center; text-align: center; }
.profile-avatar,
.public-profile-avatar {
  position: relative;
  width: 104px;
  height: 104px;
  overflow: hidden;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: linear-gradient(145deg, #dbeafe, #eff6ff);
  color: var(--primary);
  font-size: 38px;
  font-weight: 900;
}
.profile-avatar::before,
.public-profile-avatar::before { content: attr(data-initial); }
.profile-avatar img,
.public-profile-avatar img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }
.profile-summary h1 { margin: 16px 0 2px; }
.profile-summary > p { margin: 0 0 14px; color: var(--text-secondary); }
.profile-summary .button { width: 100%; margin-top: 18px; }
.verified-chip {
  display: inline-flex;
  padding: 4px 9px;
  border-radius: 999px;
  background: #e9f8ef;
  color: #15803d;
  font-size: 12px;
  font-weight: 800;
}
.profile-content { display: grid; gap: 22px; }
.profile-form { display: grid; gap: 16px; }
.profile-form label { display: grid; gap: 7px; color: var(--text-secondary); font-size: 13px; font-weight: 800; }
.profile-form textarea { resize: vertical; font: inherit; }
.profile-avatar-actions { display: flex; align-items: center; flex-wrap: wrap; gap: 10px; }
.profile-avatar-actions .account-center-button { display: inline-flex; align-items: center; gap: 8px; text-decoration: none; }
.profile-avatar-actions small { flex-basis: 100%; color: var(--text-secondary); }
.profile-form-actions { display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.profile-form-actions span { color: var(--text-secondary); font-size: 13px; }

.public-profile { display: grid; gap: 22px; }
.public-profile-hero { display: grid; grid-template-columns: 132px minmax(0, 1fr); gap: 26px; align-items: center; }
.public-profile-avatar { width: 120px; height: 120px; }
.public-profile-name { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }
.public-profile-name h1 { margin: 0; }
.public-profile-handle { margin: 3px 0 14px; color: var(--text-secondary); }
.public-profile-bio { max-width: 680px; }
.public-profile-stats { display: flex; gap: 24px; color: var(--text-secondary); }
.public-profile-stats strong { color: var(--text-main); }
.public-profile-actions { margin-top: 18px; display: flex; align-items: center; gap: 9px; flex-wrap: wrap; }
.blocked-message-tip { color: #b91c1c; font-size: 13px; }
.profile-project-list { display: grid; gap: 8px; }
.profile-project-list a { padding: 13px; display: flex; align-items: center; justify-content: space-between; border: 1px solid var(--border); border-radius: 8px; }
.profile-project-list a:hover { border-color: #a8c8f7; background: #f8fbff; }
.profile-project-list a span { display: grid; }
.profile-project-list small,
.profile-project-list time { color: var(--text-secondary); }

.member-title a:hover { color: var(--primary); }
.member-action-link {
  padding: 0;
  border: 0;
  background: transparent;
  color: var(--primary);
  cursor: pointer;
  font: inherit;
}
.member-action-link:disabled { color: var(--text-secondary); cursor: default; }
.admin-subsection { margin-top: 24px; }
.admin-subsection h3 { margin: 0 0 10px; }

.admin-security-form { padding: 20px; display: grid; gap: 24px; }
.admin-security-group { display: grid; gap: 14px; }
.admin-security-group h3,
.admin-security-group p { margin: 0; }
.admin-security-group p { margin-top: 4px; color: var(--muted); font-size: 14px; }
.admin-security-fields {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 14px;
}
.admin-security-fields label { display: grid; gap: 7px; font-weight: 700; }
.admin-security-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  border-top: 1px solid var(--border);
  padding-top: 18px;
}
.admin-security-actions p { margin: 0; }

@media (max-width: 640px) {
  .admin-security-actions { align-items: stretch; flex-direction: column; }
}
.admin-inline-actions { display: flex; gap: 7px; flex-wrap: wrap; }

@media (max-width: 1050px) and (min-width: 761px) {
  .messages-app { grid-template-columns: 142px minmax(0, 1fr); }
  .direct-messages-view { grid-template-columns: 275px minmax(0, 1fr); }
  .message-center-nav-item { padding-left: 8px; padding-right: 8px; }
  .message-list { padding-left: 20px; padding-right: 20px; }
}

@media (max-width: 760px) {
  .messages-page { overflow: auto; }
  .messages-shell { width: 100%; padding: 0; }
  .messages-app { height: calc(100vh - 126px); min-height: 500px; grid-template-columns: 1fr; grid-template-rows: auto minmax(0, 1fr); border-radius: 0; border-left: 0; border-right: 0; }
  .message-center-nav { border-right: 0; border-bottom: 1px solid var(--border); }
  .message-center-brand { display: none; }
  .message-center-nav nav { padding: 7px 8px; display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 4px; }
  .message-center-nav-item { min-height: 42px; padding: 7px 5px; display: flex; justify-content: center; gap: 5px; text-align: center; }
  .message-center-nav-item svg { width: 17px; height: 17px; }
  .message-center-nav-item b { position: static; flex: 0 0 auto; }
  .message-center-content { min-height: 0; }
  .direct-messages-view { grid-template-columns: 1fr; }
  .conversation-sidebar { border-right: 0; }
  .chat-panel { display: none; }
  .messages-app.show-chat .direct-messages-view .conversation-sidebar { display: none; }
  .messages-app.show-chat .direct-messages-view .chat-panel { display: block; }
  .mobile-chat-back { display: block; }
  .message-bubble-wrap { max-width: 82%; }
  .message-activity-head { min-height: 68px; padding: 13px 16px; }
  .message-activity-head .eyebrow { display: none; }
  .message-activity-head h2 { font-size: 20px; }
  .message-activity-item { padding: 15px 14px; grid-template-columns: 40px minmax(0, 1fr); align-items: start; }
  .message-activity-item .user-avatar { width: 40px; height: 40px; }
  .message-activity-target { grid-column: 2; max-width: 100%; }
  .profile-grid { grid-template-columns: 1fr; }
  .profile-summary { position: static; }
  .public-profile-hero { grid-template-columns: 1fr; justify-items: center; text-align: center; }
  .public-profile-copy { display: grid; justify-items: center; }
  .public-profile-stats,
  .public-profile-actions { justify-content: center; }
}

/* 公告列表、内容详情与通用留言区。 */
.section-more-link {
  color: var(--primary);
  font-size: 14px;
  font-weight: 800;
  white-space: nowrap;
}
.section-more-link:hover { color: var(--primary-dark); }
.announcement-list li { padding: 0; overflow: hidden; }
.announcement-list li a {
  min-height: 52px;
  padding: 14px 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
}
.announcement-list li a:hover { background: #eef6ff; }
.announcement-list li span { min-width: 0; }
.announcement-list li strong {
  margin-right: 8px;
  color: var(--primary);
  font-size: 12px;
}
.announcement-list li time { flex: 0 0 auto; color: var(--text-secondary); font-size: 12px; }

.announcements-layout { flex: 1; padding: 48px 0 64px; }
.announcement-list-hero {
  margin-bottom: 28px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(260px, 380px);
  align-items: end;
  gap: 30px;
}
.announcement-list-hero h1 { margin-bottom: 8px; }
.announcement-list-hero p:last-child { margin-bottom: 0; }
.announcement-search { padding-bottom: 7px; }
.announcement-cards { display: grid; gap: 14px; }
.announcement-list-card {
  padding: 22px 24px;
  display: block;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--shadow-soft);
  transition: border-color .16s ease, transform .16s ease, box-shadow .16s ease;
}
.announcement-list-card:hover {
  border-color: #a8c8f7;
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}
.announcement-list-card h2 { margin: 8px 0 5px; font-size: 22px; }
.announcement-list-card p { margin-bottom: 14px; }
.announcement-card-meta,
.announcement-list-card footer,
.announcement-detail-meta,
.resource-detail-tags,
.resource-detail-stats {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  color: var(--text-secondary);
  font-size: 13px;
}
.announcement-list-card footer strong { margin-left: auto; color: var(--primary); }
.announcement-pinned {
  display: inline-flex;
  padding: 3px 8px;
  border-radius: 999px;
  background: var(--primary-soft);
  color: var(--primary);
  font-size: 12px;
  font-weight: 800;
}
.announcement-pagination {
  margin-top: 26px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 18px;
}
.announcement-pagination span { color: var(--text-secondary); font-size: 13px; }

.content-detail-layout { flex: 1; width: min(900px, calc(100% - 40px)); padding: 30px 0 64px; }
.content-detail-layout.is-video-detail { width: min(var(--container), calc(100% - 40px)); }
.detail-breadcrumb {
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text-secondary);
  font-size: 13px;
}
.detail-breadcrumb a { color: var(--primary); font-weight: 800; }
.detail-breadcrumb span::before { margin-right: 10px; content: "/"; color: #b1bdcc; }
.announcement-detail { padding: clamp(26px, 5vw, 54px); }
.announcement-detail header { padding-bottom: 28px; border-bottom: 1px solid var(--border); }
.announcement-detail h1 { margin: 12px 0; font-size: clamp(32px, 5vw, 48px); }
.announcement-detail-summary { max-width: 720px; margin-bottom: 18px; font-size: 17px; }
.announcement-detail-flags { display: flex; align-items: center; gap: 9px; color: var(--primary); font-size: 13px; font-weight: 800; }
.announcement-content { padding-top: 30px; color: #2e3c50; font-size: 16px; line-height: 1.95; }
.announcement-content p { color: inherit; }

.resource-detail-card {
  display: grid;
  grid-template-columns: minmax(220px, 35%) minmax(0, 1fr);
  gap: 30px;
  align-items: center;
}
.resource-detail-card.is-video-resource {
  grid-template-columns: minmax(0, 1fr);
  align-items: start;
}
.resource-detail-cover {
  min-height: 270px;
  overflow: hidden;
  border-radius: var(--radius);
  background: #e9f1fb;
}
.resource-detail-video-frame {
  width: 100%;
  max-width: 1080px;
  margin-inline: auto;
  aspect-ratio: 16 / 9;
  border-radius: var(--radius);
}
.resource-detail-card.is-video-resource .resource-detail-copy {
  width: min(1080px, 100%);
  margin-inline: auto;
}
.resource-detail-cover img { width: 100%; height: 100%; min-height: 270px; display: block; object-fit: cover; }
.resource-detail-copy h1 { margin: 12px 0; font-size: clamp(30px, 5vw, 44px); }
.resource-detail-stats { margin: 18px 0; }
.resource-detail-actions { display: flex; gap: 10px; flex-wrap: wrap; }
.comments-section { margin-top: 22px; padding: clamp(20px, 4vw, 32px); }
.comments-head {
  margin-bottom: 22px;
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 16px;
}
.comments-head h2 { margin: 2px 0 0; }
.comments-head h2 span { color: var(--text-secondary); font-size: 14px; font-weight: 600; }
.home-section-kicker {
  margin: 0;
  color: var(--primary);
  font-size: 11px;
  font-weight: 900;
  letter-spacing: .12em;
  text-transform: uppercase;
}
.comment-sort { display: inline-flex; padding: 3px; border-radius: 8px; background: #f1f5f9; }
.comment-sort button,
.comment-actions button,
.text-button {
  border: 0;
  background: transparent;
  color: var(--text-secondary);
  cursor: pointer;
  font: inherit;
}
.comment-sort button { padding: 7px 12px; border-radius: 6px; font-size: 13px; font-weight: 800; }
.comment-sort button.active { background: #fff; color: var(--primary); box-shadow: 0 2px 8px rgba(31, 72, 125, .1); }
.comment-login-tip {
  padding: 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  border: 1px dashed #c8d9ee;
  border-radius: var(--radius);
  background: var(--surface-soft);
  color: var(--text-secondary);
}
.comment-composer {
  margin-bottom: 8px;
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 12px;
}
.comment-composer > div { min-width: 0; }
.comment-composer textarea,
.inline-reply-form textarea {
  width: 100%;
  min-height: 86px;
  padding: 12px 13px;
  resize: vertical;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  outline: none;
  color: var(--text-main);
  font: inherit;
}
.comment-composer textarea:focus,
.inline-reply-form textarea:focus { border-color: var(--primary); box-shadow: var(--focus-ring); }
.comment-composer footer {
  min-height: 42px;
  padding-top: 8px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}
.comment-composer footer span { color: var(--text-secondary); font-size: 13px; }
.comment-avatar {
  position: relative;
  width: 44px;
  height: 44px;
  flex: 0 0 auto;
  overflow: hidden;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: linear-gradient(145deg, #dbeafe, #eff6ff);
  color: var(--primary);
  font-size: 16px;
  font-weight: 900;
}
.comment-avatar::before { content: attr(data-initial); }
.comment-avatar.small { width: 34px; height: 34px; font-size: 13px; }
.comment-avatar img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }
.comment-list { margin-top: 22px; }
.comment-thread { padding: 20px 0; border-top: 1px solid var(--border); }
.comment-root,
.comment-reply { display: grid; grid-template-columns: auto minmax(0, 1fr); gap: 12px; }
.comment-main { min-width: 0; }
.comment-author-line { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.comment-author-line a { font-size: 14px; font-weight: 900; }
.comment-author-line time { color: var(--text-secondary); font-size: 12px; }
.comment-verified { color: #15803d; font-size: 12px; font-weight: 900; }
.comment-content { margin: 6px 0 8px; color: #334155; line-height: 1.72; white-space: pre-wrap; overflow-wrap: anywhere; }
.comment-reply-to { color: var(--primary); font-weight: 700; }
.comment-deleted { margin: 6px 0; color: #94a3b8; font-style: italic; }
.comment-actions { display: flex; gap: 16px; }
.comment-actions button { padding: 0; font-size: 12px; }
.comment-actions .comment-like-button { display: inline-flex; align-items: center; gap: 4px; }
.comment-like-button svg {
  width: 17px;
  height: 17px;
  overflow: visible;
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 1.7;
}
.comment-like-button.liked svg { fill: currentColor; }
.comment-actions button:hover,
.comment-actions button.liked,
.text-button:hover { color: var(--primary); }
.comment-focus-context {
  margin-bottom: 12px;
  padding: 0 18px;
  border: 1px solid #bfd5f8;
  border-radius: var(--radius);
  background: #f8fbff;
}
.comment-focused {
  border-radius: 8px;
  animation: comment-focus-pulse 2.2s ease-out;
}
@keyframes comment-focus-pulse {
  0%, 35% { background: #dceaff; box-shadow: 0 0 0 10px #dceaff; }
  100% { background: transparent; box-shadow: 0 0 0 0 transparent; }
}
.comment-replies {
  margin: 14px 0 0 56px;
  padding: 14px;
  display: grid;
  gap: 16px;
  border-radius: var(--radius);
  background: var(--surface-soft);
}
.inline-reply-form { margin-top: 12px; }
.inline-reply-form textarea { min-height: 70px; }
.inline-reply-form > div { margin-top: 8px; display: flex; justify-content: flex-end; align-items: center; gap: 12px; }
.text-button { padding: 8px; }
.comment-more-wrap { display: flex; justify-content: center; }
.admin-table-link { color: var(--primary); font-weight: 800; white-space: nowrap; }

@media (max-width: 760px) {
  .admin-transfer-grid { grid-template-columns: 1fr; }
  .admin-transfer-summary { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .announcement-list-hero,
  .resource-detail-card,
  .resource-detail-card.is-video-resource { grid-template-columns: 1fr; }
  .announcement-list-hero { align-items: stretch; }
  .announcement-search { padding-bottom: 0; }
  .announcement-list-card { padding: 18px; }
  .announcement-list-card footer strong { width: 100%; margin-left: 0; }
  .content-detail-layout { width: min(100% - 24px, 900px); padding-top: 22px; }
  .resource-detail-cover,
  .resource-detail-cover img { min-height: 220px; }
  .comments-head { align-items: flex-start; flex-direction: column; }
  .comment-login-tip { align-items: flex-start; flex-direction: column; }
  .comment-replies { margin-left: 20px; padding: 12px; }
}

/* Activity images and videos share one grid and preview stage. */
.photo-item, .resource-thumb { position: relative; }
.photo-item.is-video { cursor: pointer; }
.photo-item > .resource-thumb-placeholder {
  display: block;
  width: 100%;
  aspect-ratio: 1;
  border-radius: 8px;
  background: #f0f4ff;
}
.media-play-marker {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  padding-left: 3px;
  border-radius: 50%;
  background: rgba(23, 32, 51, 0.72);
  color: #fff;
  font-size: 20px;
  pointer-events: none;
}
.activity-modal-video {
  display: block;
  width: 100%;
  max-height: calc(100dvh - 180px);
  min-height: 200px;
  object-fit: contain;
  background: #172033;
}
.photo-modal-stage [hidden] { display: none; }
.media-playback-error { padding: 12px 64px; margin: 0; color: var(--text); }