:root {
  --primary: #2563eb; --primary-hover: #1d4ed8;
  --bg: #f6f7f9; --card: #ffffff; --text: #1a1d21; --muted: #6b7280;
  --border: #e5e7eb; --red: #dc2626; --green: #16a34a; --amber: #d97706;
  --radius: 10px; --shadow: 0 1px 3px rgba(16,24,40,.08);
}
* { box-sizing: border-box; margin: 0; padding: 0; }
body { font-family: -apple-system, "PingFang SC", "Microsoft YaHei", "Segoe UI", sans-serif; background: var(--bg); color: var(--text); font-size: 15px; line-height: 1.6; }
a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }

/* 顶栏 */
.nav { position: sticky; top: 0; z-index: 50; display: flex; align-items: center; gap: 20px; height: 56px; padding: 0 20px; background: var(--card); border-bottom: 1px solid var(--border); }
.brand { font-weight: 700; font-size: 17px; color: var(--text); }
.brand:hover { text-decoration: none; }
.nav-links { display: flex; gap: 4px; flex: 1; }
.nav-links a { padding: 6px 12px; border-radius: 8px; color: var(--muted); font-size: 14px; }
.nav-links a:hover, .nav-links a.active { background: #eef2ff; color: var(--primary); text-decoration: none; }
.nav-right { display: flex; align-items: center; gap: 8px; font-size: 14px; }
.nav-right .who { color: var(--muted); }

.container { max-width: 1080px; margin: 0 auto; padding: 24px 20px 60px; }

/* 组件 */
.card { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); box-shadow: var(--shadow); padding: 20px; margin-bottom: 16px; }
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 6px; border: 1px solid transparent; border-radius: 8px; padding: 8px 16px; font-size: 14px; cursor: pointer; background: var(--primary); color: #fff; transition: background .15s; }
.btn:hover { background: var(--primary-hover); }
.btn:disabled { opacity: .5; cursor: not-allowed; }
.btn-outline { background: #fff; color: var(--text); border-color: var(--border); }
.btn-outline:hover { background: #f3f4f6; }
.btn-danger { background: var(--red); }
.btn-danger:hover { background: #b91c1c; }
.btn-sm { padding: 4px 10px; font-size: 13px; border-radius: 6px; }
.input, select, textarea { width: 100%; border: 1px solid var(--border); border-radius: 8px; padding: 9px 12px; font-size: 14px; font-family: inherit; background: #fff; color: var(--text); }
.input:focus, select:focus, textarea:focus { outline: 2px solid #bfdbfe; border-color: var(--primary); }
textarea { min-height: 160px; resize: vertical; }
label.field { display: block; margin-bottom: 14px; }
label.field span { display: block; font-size: 13px; color: var(--muted); margin-bottom: 5px; }
.badge { display: inline-block; padding: 2px 8px; border-radius: 999px; font-size: 12px; background: #eef2ff; color: var(--primary); }
.badge-gray { background: #f3f4f6; color: var(--muted); }
.badge-green { background: #dcfce7; color: var(--green); }
.badge-amber { background: #fef3c7; color: var(--amber); }
.badge-red { background: #fee2e2; color: var(--red); }
.muted { color: var(--muted); font-size: 13px; }
.row { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; }
.spacer { flex: 1; }
.grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
@media (max-width: 760px) { .grid2 { grid-template-columns: 1fr; } }

/* 标签页 */
.tabs { display: flex; gap: 4px; border-bottom: 1px solid var(--border); margin-bottom: 16px; flex-wrap: wrap; }
.tabs button { border: none; background: none; padding: 8px 14px; font-size: 14px; color: var(--muted); cursor: pointer; border-bottom: 2px solid transparent; }
.tabs button.active { color: var(--primary); border-bottom-color: var(--primary); font-weight: 600; }

/* 表格 */
table.tbl { width: 100%; border-collapse: collapse; font-size: 14px; }
.tbl th { text-align: left; padding: 8px 10px; border-bottom: 1px solid var(--border); color: var(--muted); font-weight: 500; white-space: nowrap; }
.tbl td { padding: 8px 10px; border-bottom: 1px solid #f3f4f6; vertical-align: middle; }
.tbl tr:hover td { background: #fafafa; }

/* 首页 hero */
.hero { background: linear-gradient(135deg, #1e3a8a, #2563eb); color: #fff; border-radius: var(--radius); padding: 40px 32px; margin-bottom: 20px; }
.hero h1 { font-size: 26px; margin-bottom: 8px; }
.hero p { opacity: .85; margin-bottom: 18px; }
.hero .btn { background: #fff; color: var(--primary); }
.hero .btn:hover { background: #eff6ff; }
.announce { background: #fffbeb; border: 1px solid #fde68a; color: #92400e; border-radius: 8px; padding: 10px 14px; margin-bottom: 16px; font-size: 14px; }
.stat-row { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; margin-bottom: 20px; }
@media (max-width: 760px) { .stat-row { grid-template-columns: repeat(2, 1fr); } }
.stat { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 14px 16px; text-align: center; }
.stat b { display: block; font-size: 22px; }
.stat span { color: var(--muted); font-size: 13px; }

/* 档案库布局 */
.wiki-layout { display: grid; grid-template-columns: 240px 1fr; gap: 16px; align-items: start; }
@media (max-width: 760px) { .wiki-layout { grid-template-columns: 1fr; } }
.tree { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 10px; max-height: 72vh; overflow: auto; position: sticky; top: 72px; }
.tree details { margin: 2px 0; }
.tree summary { cursor: pointer; padding: 5px 8px; border-radius: 6px; font-size: 14px; list-style: none; }
.tree summary::-webkit-details-marker { display: none; }
.tree summary:hover { background: #f3f4f6; }
.tree summary::before { content: "▸ "; color: var(--muted); font-size: 11px; }
.tree details[open] > summary::before { content: "▾ "; }
.tree .t-item { display: block; padding: 4px 8px 4px 22px; border-radius: 6px; font-size: 13px; color: var(--text); }
.tree .t-item:hover { background: #f3f4f6; text-decoration: none; }
.tree .t-item.active { background: #eef2ff; color: var(--primary); font-weight: 600; }
.tree .t-count { color: var(--muted); font-size: 12px; }

/* Markdown 内容 */
.md { word-break: break-word; }
.md h1, .md h2, .md h3, .md h4 { margin: 18px 0 8px; line-height: 1.4; }
.md h1 { font-size: 22px; } .md h2 { font-size: 18px; } .md h3 { font-size: 16px; } .md h4 { font-size: 15px; }
.md p { margin: 8px 0; }
.md ul, .md ol { margin: 8px 0 8px 22px; }
.md code { background: #f3f4f6; border-radius: 4px; padding: 1px 6px; font-size: 13px; font-family: Consolas, monospace; }
.md pre { background: #f8fafc; border: 1px solid var(--border); border-radius: 8px; padding: 12px; overflow: auto; margin: 10px 0; }
.md pre code { background: none; padding: 0; }
.md blockquote { border-left: 3px solid var(--border); padding-left: 12px; color: var(--muted); margin: 10px 0; }
.md a { word-break: break-all; }
.md hr { border: none; border-top: 1px solid var(--border); margin: 16px 0; }
.empty { text-align: center; color: var(--muted); padding: 48px 0; }

/* 弹窗 / toast */
.modal-mask { position: fixed; inset: 0; background: rgba(15,23,42,.45); display: flex; align-items: center; justify-content: center; z-index: 100; padding: 20px; }
.modal { background: #fff; border-radius: 12px; padding: 22px; width: 100%; max-width: 440px; max-height: 86vh; overflow: auto; }
.modal h3 { margin-bottom: 14px; }
.modal .row { justify-content: flex-end; margin-top: 16px; }
#toast-root { position: fixed; top: 70px; left: 50%; transform: translateX(-50%); z-index: 200; display: flex; flex-direction: column; gap: 8px; }
.toast { background: #111827; color: #fff; padding: 9px 18px; border-radius: 8px; font-size: 14px; box-shadow: 0 4px 12px rgba(0,0,0,.2); animation: tin .18s ease; }
.toast.err { background: var(--red); }
@keyframes tin { from { opacity: 0; transform: translateY(-6px); } }

/* 登录/注册独立页 */
.auth-body { min-height: 100vh; display: flex; align-items: center; justify-content: center; background: #eef1f5; padding: 20px; }
.auth-card { background: #fff; border-radius: 14px; box-shadow: 0 8px 30px rgba(16,24,40,.10); padding: 32px; width: 100%; max-width: 400px; }
.auth-brand { text-align: center; font-size: 20px; font-weight: 700; margin-bottom: 4px; }
.auth-sub { text-align: center; color: var(--muted); font-size: 13px; margin-bottom: 20px; }
.auth-tabs { display: flex; background: #f3f4f6; border-radius: 9px; padding: 3px; margin-bottom: 20px; }
.auth-tabs button { flex: 1; border: none; background: none; padding: 8px; border-radius: 7px; font-size: 14px; cursor: pointer; color: var(--muted); }
.auth-tabs button.active { background: #fff; color: var(--text); font-weight: 600; box-shadow: var(--shadow); }
.auth-card .btn { width: 100%; padding: 10px; margin-top: 4px; }
.auth-hint { text-align: center; font-size: 12px; color: var(--muted); margin-top: 16px; }
.pw-wrap { position: relative; }
.pw-toggle { position: absolute; right: 10px; top: 50%; transform: translateY(-50%); border: none; background: none; color: var(--muted); font-size: 12px; cursor: pointer; }