:root {
  --primary: #2f6fed;
  --primary-dark: #1f52c4;
  --primary-soft: #eaf1ff;
  --text: #1f2329;
  --text-2: #646a73;
  --text-3: #8f959e;
  --border: #e5e6eb;
  --bg: #f5f6f7;
  --card: #ffffff;
  --success: #0aa06e;
  --warning: #e8891c;
  --danger: #d94f6a;
  --radius: 10px;
  --shadow: 0 1px 3px rgba(31, 35, 41, .08);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  font-size: 14px;
  line-height: 1.6;
}

a { color: var(--primary); text-decoration: none; }
a:hover { color: var(--primary-dark); }
h1, h2, h3, h4 { margin: 0 0 12px; font-weight: 600; line-height: 1.35; }
h1 { font-size: 22px; }
h2 { font-size: 18px; }
h3 { font-size: 16px; }
p { margin: 0 0 10px; }
.muted { color: var(--text-3); }
code { font-family: "JetBrains Mono", Consolas, Monaco, monospace; }

/* ---------- 顶栏 ---------- */
.topbar {
  background: #fff;
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
}
.topbar-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
  height: 56px;
  display: flex;
  align-items: center;
  gap: 24px;
}
.brand { display: flex; align-items: center; gap: 8px; color: var(--text); font-weight: 600; font-size: 16px; }
.brand-mark {
  width: 28px; height: 28px; border-radius: 8px;
  background: linear-gradient(135deg, var(--primary), #5b8def);
  color: #fff; display: inline-flex; align-items: center; justify-content: center; font-size: 15px;
}
.nav { display: flex; gap: 4px; flex: 1; }
.nav-link { padding: 6px 12px; border-radius: 6px; color: var(--text-2); }
.nav-link:hover { background: var(--bg); color: var(--text); }
.nav-link.active { background: var(--primary-soft); color: var(--primary); font-weight: 500; }
.topbar-right { display: flex; align-items: center; gap: 10px; }

.avatar {
  width: 28px; height: 28px; border-radius: 50%;
  display: inline-flex; align-items: center; justify-content: center;
  color: #fff; font-size: 12px; font-weight: 600; flex: none;
}
.avatar-lg { width: 48px; height: 48px; font-size: 18px; }
.avatar-btn {
  display: flex; align-items: center; gap: 8px;
  background: none; border: 0; cursor: pointer; padding: 4px 8px; border-radius: 6px; color: var(--text);
}
.avatar-btn:hover { background: var(--bg); }
.user-menu { position: relative; }
.dropdown {
  display: none; position: absolute; right: 0; top: 42px; min-width: 180px;
  background: #fff; border: 1px solid var(--border); border-radius: var(--radius);
  box-shadow: 0 4px 16px rgba(31,35,41,.12); padding: 6px; z-index: 200;
}
.dropdown.open { display: block; }
.dropdown a { display: block; padding: 8px 10px; border-radius: 6px; color: var(--text); }
.dropdown a:hover { background: var(--bg); }

.site-notice {
  background: #fff7e6; border-bottom: 1px solid #ffe0a3; color: #8a5a00;
  padding: 8px 20px; text-align: center; font-size: 13px;
}

/* ---------- 布局 ---------- */
.container { max-width: 1200px; margin: 0 auto; padding: 20px; }
.card {
  background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 18px; box-shadow: var(--shadow);
}
.card + .card { margin-top: 16px; }
.card-title { display: flex; align-items: center; justify-content: space-between; margin-bottom: 14px; }
.card-title h2, .card-title h3 { margin: 0; }
.grid { display: grid; gap: 16px; }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
@media (max-width: 900px) {
  .grid-3, .grid-4, .grid-2 { grid-template-columns: 1fr; }
}
.row { display: flex; gap: 12px; align-items: center; flex-wrap: wrap; }
.row-between { display: flex; justify-content: space-between; align-items: center; gap: 12px; flex-wrap: wrap; }
.spacer { flex: 1; }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  padding: 7px 14px; border-radius: 6px; border: 1px solid var(--border);
  background: #fff; color: var(--text); cursor: pointer; font-size: 14px; line-height: 1.4;
}
.btn:hover { border-color: var(--primary); color: var(--primary); }
.btn-primary { background: var(--primary); border-color: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); color: #fff; }
.btn-danger { color: var(--danger); border-color: #f3c6ce; }
.btn-danger:hover { background: #fdeef1; border-color: var(--danger); color: var(--danger); }
.btn-sm { padding: 4px 10px; font-size: 13px; }
.btn-block { width: 100%; }

/* ---------- 表单 ---------- */
.field { margin-bottom: 14px; }
.field label { display: block; margin-bottom: 6px; font-weight: 500; }
.field .hint { color: var(--text-3); font-size: 12px; margin-top: 4px; }
input[type=text], input[type=password], input[type=email], input[type=number], select, textarea {
  width: 100%; padding: 8px 12px; border: 1px solid var(--border); border-radius: 6px;
  font-size: 14px; font-family: inherit; background: #fff; color: var(--text);
}
input:focus, select:focus, textarea:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px rgba(47,111,237,.12); }
textarea { min-height: 120px; resize: vertical; }
textarea.tall { min-height: 320px; }
.checkbox { display: inline-flex; align-items: center; gap: 6px; font-weight: normal; }
.checkbox input { width: auto; }
.form-inline { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }
.form-inline input, .form-inline select { width: auto; }

/* ---------- 提示 ---------- */
.flash-wrap { margin-bottom: 16px; }
.flash { padding: 10px 14px; border-radius: 8px; margin-bottom: 8px; border: 1px solid transparent; }
.flash-info { background: var(--primary-soft); border-color: #c9dbff; color: var(--primary-dark); }
.flash-success { background: #e8f8f1; border-color: #b9e7d3; color: #06734f; }
.flash-warning { background: #fff7e6; border-color: #ffe0a3; color: #8a5a00; }
.flash-error { background: #fdeef1; border-color: #f5c6ce; color: #a32643; }

.badge {
  display: inline-block; padding: 1px 8px; border-radius: 10px; font-size: 12px;
  background: var(--bg); color: var(--text-2); border: 1px solid var(--border);
}
.badge-primary { background: var(--primary-soft); color: var(--primary); border-color: #c9dbff; }
.badge-success { background: #e8f8f1; color: #06734f; border-color: #b9e7d3; }
.badge-warning { background: #fff7e6; color: #8a5a00; border-color: #ffe0a3; }
.badge-danger { background: #fdeef1; color: #a32643; border-color: #f5c6ce; }

/* ---------- 社团头部与标签 ---------- */
.club-header { display: flex; justify-content: space-between; align-items: center; gap: 16px; margin-bottom: 14px; flex-wrap: wrap; }
.club-title { display: flex; align-items: center; gap: 12px; }
.club-title h1 { margin: 0; }
.club-title p { margin: 0; }
.club-invite { text-align: right; }
.invite-code {
  display: inline-block; background: var(--primary-soft); color: var(--primary-dark);
  padding: 3px 12px; border-radius: 6px; font-weight: 600; letter-spacing: 2px; font-size: 15px;
}
.tabs { display: flex; gap: 4px; border-bottom: 1px solid var(--border); margin-bottom: 18px; overflow-x: auto; }
.tab { padding: 8px 14px; border-bottom: 2px solid transparent; color: var(--text-2); white-space: nowrap; }
.tab:hover { color: var(--text); }
.tab.active { color: var(--primary); border-bottom-color: var(--primary); font-weight: 500; }

/* ---------- 列表 ---------- */
.list { list-style: none; margin: 0; padding: 0; }
.list-item {
  display: flex; justify-content: space-between; align-items: center; gap: 12px;
  padding: 12px 0; border-bottom: 1px solid var(--border);
}
.list-item:last-child { border-bottom: 0; }
.list-item .title { font-weight: 500; color: var(--text); }
.list-item .meta { color: var(--text-3); font-size: 12px; }
.club-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 16px; }
.club-card { display: block; padding: 16px; border: 1px solid var(--border); border-radius: var(--radius); background: #fff; box-shadow: var(--shadow); }
.club-card:hover { border-color: var(--primary); }
.club-card h3 { margin: 0 0 6px; color: var(--text); }
.stat-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(140px, 1fr)); gap: 14px; }
.stat { background: #fff; border: 1px solid var(--border); border-radius: var(--radius); padding: 14px; }
.stat .num { font-size: 24px; font-weight: 600; color: var(--primary); }
.stat .label { color: var(--text-3); font-size: 13px; }

.empty { text-align: center; padding: 40px 20px; color: var(--text-3); }
.empty-icon { font-size: 34px; margin-bottom: 8px; }

.pagination { display: flex; gap: 6px; margin-top: 16px; }
.pagination a { padding: 4px 10px; border: 1px solid var(--border); border-radius: 6px; background: #fff; color: var(--text-2); }
.pagination a.active { background: var(--primary); color: #fff; border-color: var(--primary); }

/* ---------- 表格 ---------- */
table.table { width: 100%; border-collapse: collapse; font-size: 13px; }
.table th, .table td { padding: 10px 12px; border-bottom: 1px solid var(--border); text-align: left; vertical-align: middle; }
.table th { color: var(--text-2); font-weight: 500; background: #fafbfc; }
.table tr:hover td { background: #fafbfc; }
.table-actions { display: flex; gap: 6px; flex-wrap: wrap; }

/* ---------- 云盘 ---------- */
.breadcrumb { display: flex; gap: 6px; align-items: center; margin-bottom: 12px; flex-wrap: wrap; color: var(--text-2); }
.breadcrumb a { color: var(--text-2); }
.breadcrumb .sep { color: var(--text-3); }
.file-row { display: flex; align-items: center; gap: 10px; padding: 10px 12px; border-bottom: 1px solid var(--border); }
.file-row:hover { background: #fafbfc; }
.file-icon { width: 28px; text-align: center; font-size: 18px; }
.file-name { flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.file-meta { color: var(--text-3); font-size: 12px; width: 120px; text-align: right; }
.dropzone {
  border: 2px dashed var(--border); border-radius: var(--radius); padding: 22px; text-align: center;
  color: var(--text-3); background: #fafbfc; cursor: pointer;
}
.dropzone.dragover { border-color: var(--primary); background: var(--primary-soft); color: var(--primary); }

/* ---------- 评论 ---------- */
.comment { border-left: 2px solid var(--border); padding-left: 14px; margin-top: 14px; }
.comment-body { background: #fff; border: 1px solid var(--border); border-radius: 8px; padding: 12px; }
.comment-head { display: flex; align-items: center; gap: 8px; margin-bottom: 6px; }
.comment-content { white-space: pre-wrap; word-break: break-word; }
.comment-actions { margin-top: 6px; display: flex; gap: 10px; font-size: 13px; }
.reply-form { display: none; margin-top: 8px; }
.reply-form.open { display: block; }

/* ---------- Markdown 正文 ---------- */
.markdown { line-height: 1.75; word-break: break-word; }
.markdown h1 { font-size: 22px; margin-top: 22px; }
.markdown h2 { font-size: 19px; margin-top: 20px; padding-bottom: 6px; border-bottom: 1px solid var(--border); }
.markdown h3 { font-size: 16px; margin-top: 18px; }
.markdown p { margin: 10px 0; }
.markdown ul, .markdown ol { padding-left: 22px; }
.markdown code { background: #f2f3f5; padding: 1px 6px; border-radius: 4px; font-size: 13px; }
.markdown pre { background: #f7f8fa; border: 1px solid var(--border); border-radius: 8px; padding: 12px; overflow-x: auto; }
.markdown pre code { background: none; padding: 0; }
.markdown blockquote { margin: 10px 0; padding: 6px 14px; border-left: 3px solid var(--primary); color: var(--text-2); background: #fafbfc; }
.markdown img { max-width: 100%; border-radius: 6px; }
.markdown hr { border: 0; border-top: 1px solid var(--border); margin: 18px 0; }

/* ---------- 后台 ---------- */
.admin-wrap { display: grid; grid-template-columns: 190px 1fr; gap: 18px; align-items: start; }
@media (max-width: 800px) { .admin-wrap { grid-template-columns: 1fr; } }
.admin-side { background: #fff; border: 1px solid var(--border); border-radius: var(--radius); padding: 12px; position: sticky; top: 76px; }
.admin-side h3 { font-size: 14px; margin: 6px 8px 12px; }
.side-link { display: block; padding: 8px 10px; border-radius: 6px; color: var(--text-2); }
.side-link:hover { background: var(--bg); }
.side-link.active { background: var(--primary-soft); color: var(--primary); font-weight: 500; }
.admin-main { min-width: 0; }

/* ---------- 首页 hero ---------- */
.hero {
  background: linear-gradient(135deg, #2f6fed, #5b8def); color: #fff;
  border-radius: 14px; padding: 34px; margin-bottom: 18px;
}
.hero h1 { font-size: 26px; margin-bottom: 8px; }
.hero p { opacity: .92; margin-bottom: 16px; }
.hero .btn { border-color: rgba(255,255,255,.6); background: rgba(255,255,255,.14); color: #fff; }
.hero .btn-primary { background: #fff; color: var(--primary); border-color: #fff; }

/* ---------- 其他 ---------- */
.footer { margin-top: 30px; padding: 18px 0; border-top: 1px solid var(--border); background: #fff; }
.footer-inner { display: flex; justify-content: space-between; color: var(--text-3); font-size: 13px; }
.auth-wrap { max-width: 420px; margin: 30px auto; }
.auth-switch { text-align: center; margin-top: 14px; color: var(--text-2); }
.segmented { display: flex; border: 1px solid var(--border); border-radius: 8px; overflow: hidden; margin-bottom: 16px; }
.segmented label { flex: 1; text-align: center; padding: 9px; cursor: pointer; color: var(--text-2); border-right: 1px solid var(--border); }
.segmented label:last-child { border-right: 0; }
.segmented input { display: none; }
.segmented input:checked + span { color: var(--primary); font-weight: 600; }
.segmented label:has(input:checked) { background: var(--primary-soft); }
.kv { display: grid; grid-template-columns: 120px 1fr; gap: 8px; font-size: 14px; }
.kv .k { color: var(--text-3); }
.search-row { display: flex; gap: 8px; margin-bottom: 14px; }
.search-row input { flex: 1; }