:root {
  --bg: #F5F7F8;
  --card: #ffffff;
  --ink: #1A1A1A;
  --text: #1A1A1A;
  --muted: #6B7280;
  --primary: #B3382C;
  --primary-dark: #8F2B22;
  --border: #E2E5E9;
  --radius: 0px;
  --serif: "Noto Serif SC", "Songti SC", "SimSun", serif;
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, "Courier New", monospace;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

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

/* ── 导航：期刊顶栏（双线收边） ─────────────── */
.nav {
  background: var(--card);
  border-bottom: 4px double var(--ink);
  position: sticky;
  top: 0;
  z-index: 10;
}

.nav-inner {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 24px;
  height: 58px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  font-family: var(--serif);
  font-weight: 900;
  font-size: 19px;
  color: var(--ink);
  text-decoration: none;
  letter-spacing: 0.02em;
}

.brand-sub { color: var(--primary); margin-left: 6px; }

.nav-links { display: flex; align-items: center; gap: 20px; }

.nav-links a:not(.btn) {
  color: var(--ink);
  text-decoration: none;
  font-size: 13px;
  letter-spacing: 0.12em;
}

.nav-links a:not(.btn):hover { color: var(--primary); }

.nav-user { color: var(--muted); font-size: 12px; font-family: var(--mono); }

/* ── 主容器与页眉小标 ─────────────────── */
.main {
  max-width: 1120px;
  margin: 0 auto;
  padding: 48px 24px 64px;
  width: 100%;
  flex: 1;
}

.page-kicker {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.3em;
  color: var(--primary);
  margin-bottom: 10px;
}

h2, h3 { font-family: var(--serif); }

.dash h2, .auth-box h2 {
  font-weight: 900;
  font-size: 26px;
  letter-spacing: 0.02em;
  margin-bottom: 10px;
}

.dash-sub { color: var(--muted); margin-bottom: 10px; font-size: 14px; }

/* ── 卡片：白纸 + 细墨线 + 红方标 ─────────── */
.card {
  background: var(--card);
  border: 1px solid var(--ink);
  border-radius: var(--radius);
  padding: 24px;
}

.main a:not([class]) { color: var(--primary); text-decoration: none; }

.main a:not([class]):hover { text-decoration: underline; }

.card h3 { margin-bottom: 10px; font-size: 17px; font-weight: 600; }

.card p { color: var(--muted); font-size: 14px; line-height: 1.6; }

.admin-card { margin-top: 20px; }

.admin-card h3::before {
  content: '';
  display: inline-block;
  width: 8px;
  height: 8px;
  background: var(--primary);
  margin-right: 10px;
}

.admin-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

a.card-link { display: block; text-decoration: none; color: inherit; }

a.card-link:hover { border-color: var(--primary); }

/* ── 表格 ─────────────────────────── */
.table-wrap { overflow-x: auto; }

.admin-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}

.admin-table th, .admin-table td {
  text-align: left;
  padding: 10px 12px;
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
}

.admin-table th {
  color: var(--muted);
  font-weight: 500;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.2em;
}

.admin-table tbody tr:hover { background: #FAFBFC; }

.admin-table .actions { display: flex; gap: 8px; flex-wrap: wrap; }

.tag {
  display: inline-block;
  margin-left: 6px;
  padding: 1px 7px;
  border: 1px solid var(--primary);
  color: var(--primary);
  background: transparent;
  border-radius: 0;
  font-size: 11px;
  letter-spacing: 0.1em;
}

/* ── 表单：方角输入 · 红色聚焦 ─────────── */
.auth-box {
  max-width: 440px;
  margin: 40px auto;
  background: var(--card);
  border: 1px solid var(--ink);
  border-top: 4px solid var(--ink);
  border-radius: var(--radius);
  padding: 40px 44px 36px;
}

.auth-box label {
  display: block;
  font-size: 14px;
  color: var(--muted);
  margin-bottom: 14px;
}

.auth-box input {
  display: block;
  width: 100%;
  margin-top: 6px;
  padding: 10px 12px;
  border: 1px solid #D1D5DB;
  border-radius: var(--radius);
  font-size: 15px;
  outline: none;
  background: #fff;
}

.account-field { margin-bottom: 14px; }

.account-field label {
  display: block;
  font-size: 13px;
  color: var(--muted);
  margin-bottom: 6px;
}

.account-field input {
  width: 100%;
  max-width: 320px;
  padding: 10px 12px;
  border: 1px solid #D1D5DB;
  border-radius: var(--radius);
  font-size: 15px;
  outline: none;
  background: #fff;
}

.auth-box input:focus, .account-field input:focus { border-color: var(--primary); }

.form-msg { color: var(--primary); font-size: 13px; min-height: 18px; margin-bottom: 10px; }

.auth-alt { margin-top: 16px; font-size: 14px; color: var(--muted); }

.auth-alt a { color: var(--primary); text-decoration: none; }

.auth-alt a:hover { text-decoration: underline; }

/* ── 按钮：方角 · 墨底 · 悬停转红 ─────────── */
.btn {
  display: inline-block;
  padding: 8px 18px;
  border: 1px solid var(--ink);
  border-radius: var(--radius);
  background: var(--card);
  color: var(--ink);
  font-size: 14px;
  letter-spacing: 0.06em;
  text-decoration: none;
  cursor: pointer;
}

.btn:hover { border-color: var(--primary); color: var(--primary); }

.btn-primary {
  background: var(--ink);
  border-color: var(--ink);
  color: #fff;
}

.btn-primary:hover { background: var(--primary); border-color: var(--primary); color: #fff; }

.btn-lg { padding: 12px 28px; font-size: 16px; }

.btn-block { display: block; width: 100%; padding: 12px; text-align: center; }

button.btn { border-width: 1px; font-family: inherit; }

.btn-sm { padding: 4px 10px; font-size: 13px; }

.btn-danger {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
}

.btn-danger:hover { background: var(--primary-dark); border-color: var(--primary-dark); color: #fff; }

/* ── 页脚：双线收口 ─────────────────── */
.footer {
  border-top: 4px double var(--ink);
  background: var(--card);
  margin-top: 40px;
}

.footer-inner {
  max-width: 1120px;
  margin: 0 auto;
  padding: 20px 24px;
  color: var(--muted);
  font-size: 12px;
  font-family: var(--mono);
  letter-spacing: 0.12em;
  text-align: center;
}

/* ── Markdown 渲染（项目详情） ─────────── */
.md { font-size: 14px; line-height: 1.75; color: var(--text); }

.md h1, .md h2, .md h3, .md h4 { font-family: var(--serif); margin: 18px 0 8px; }

.md h1 { font-size: 21px; font-weight: 900; }

.md h2 { font-size: 18px; font-weight: 900; border-bottom: 1px solid var(--border); padding-bottom: 6px; }

.md h3 { font-size: 16px; font-weight: 600; }

.md p { margin: 8px 0; }

.md ul, .md ol { margin: 8px 0 8px 22px; }

.md blockquote {
  border-left: 3px solid var(--ink);
  background: #FAFBFC;
  padding: 10px 14px;
  margin: 10px 0;
  color: var(--muted);
}

.md blockquote p { margin: 4px 0; }

.md table { border-collapse: collapse; width: 100%; margin: 10px 0; font-size: 13px; }

.md th, .md td { border: 1px solid var(--border); padding: 7px 10px; text-align: left; }

.md th { background: #FAFBFC; font-family: var(--mono); font-size: 12px; letter-spacing: 0.08em; }

.md code { font-family: var(--mono); background: #F3F4F6; padding: 1px 5px; font-size: 12.5px; }

.md pre { background: #F3F4F6; padding: 12px; overflow-x: auto; margin: 10px 0; }

.md pre code { background: none; padding: 0; }

.md hr { border: none; border-top: 1px solid var(--border); margin: 16px 0; }

.md .mermaid { text-align: center; margin: 14px 0; overflow-x: auto; }

@media (max-width: 600px) {
  .md table, .md .mermaid, .md pre { display: block; overflow-x: auto; white-space: nowrap; }
}

@media (max-width: 600px) {
  .nav-inner { padding: 0 16px; height: 54px; }
  .brand { font-size: 17px; }
  .main { padding: 32px 16px 48px; }
  .auth-box { margin: 24px auto; padding: 28px 22px; }
  .dash h2, .auth-box h2 { font-size: 22px; }
}

/* 项目进展：选择卡 + 抽屉 */
.pj-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; margin-top: 20px; }
.pj-card {
  display: flex; flex-direction: column; align-items: flex-start; gap: 10px;
  text-align: left; padding: 28px 26px; background: #fff;
  border: 1px solid var(--ink); border-radius: 0; cursor: pointer;
  font-family: inherit; transition: border-color .15s, background .15s;
}
.pj-card:hover { border-color: var(--primary); background: #FDFBF9; }
.pj-card .pj-no { font-family: var(--mono); font-size: 13px; font-weight: 700; color: var(--primary); letter-spacing: .1em; }
.pj-card .pj-name { font-family: var(--serif); font-weight: 900; font-size: 24px; color: var(--ink); }
.pj-card .pj-desc { font-size: 13px; color: var(--muted); line-height: 1.6; }
.pj-card .pj-go { margin-top: 4px; font-size: 13px; color: var(--ink); border: 1px solid #D1D5DB; padding: 7px 16px; background: #fff; transition: .15s; }
.pj-card:hover .pj-go { border-color: var(--primary); color: var(--primary); }
.pj-mask { position: fixed; inset: 0; background: rgba(17, 24, 39, .38); opacity: 0; transition: opacity .25s; z-index: 90; }
.pj-mask.show { opacity: 1; }
.pj-drawer {
  position: fixed; top: 0; right: 0; bottom: 0; width: 380px; max-width: 88vw;
  background: #fff; border-left: 4px double var(--ink); z-index: 91;
  transform: translateX(102%); transition: transform .28s ease; padding: 26px 24px;
  display: flex; flex-direction: column;
}
.pj-drawer.open { transform: translateX(0); }
.pj-drawer-head { display: flex; align-items: center; justify-content: space-between; border-bottom: 1px solid var(--ink); padding-bottom: 14px; margin-bottom: 18px; }
.pj-drawer-title { font-family: var(--serif); font-weight: 900; font-size: 20px; }
.pj-close { background: none; border: 1px solid #D1D5DB; font-size: 18px; line-height: 1; padding: 6px 12px; cursor: pointer; color: var(--ink); }
.pj-close:hover { border-color: var(--primary); color: var(--primary); }
.pj-opt { display: flex; align-items: center; gap: 14px; padding: 18px 10px; border-bottom: 1px solid #E5E7EB; text-decoration: none; transition: background .15s; }
.pj-opt:hover { background: #FAFAF8; }
.pj-opt .pj-opt-no { flex: none; width: 40px; height: 40px; display: flex; align-items: center; justify-content: center; border: 1px solid var(--ink); font-family: var(--serif); font-weight: 900; font-size: 17px; }
.pj-opt:hover .pj-opt-no { border-color: var(--primary); color: var(--primary); }
.pj-opt .pj-opt-body { flex: 1; display: flex; flex-direction: column; gap: 4px; }
.pj-opt .pj-opt-name { font-family: var(--serif); font-weight: 600; font-size: 18px; color: var(--ink); }
.pj-opt:hover .pj-opt-name { color: var(--primary); }
.pj-opt .pj-opt-sub { font-size: 12.5px; color: var(--muted); }
.pj-opt .pj-opt-arrow { flex: none; color: var(--muted); font-size: 15px; }
@media (max-width: 600px) {
  .pj-grid { grid-template-columns: 1fr; }
  .pj-drawer { padding: 20px 16px; }
}

/* ── 通知铃铛 ─────────────────────────────── */
.nav-bell { position: relative; cursor: pointer; display: inline-flex; align-items: center; color: var(--ink); padding: 4px; }
.nav-bell:hover { color: var(--primary); }
.bell-badge {
  position: absolute; top: -4px; right: -6px; background: var(--primary); color: #fff;
  font-size: 10px; line-height: 1; padding: 3px 5px; border-radius: 8px; font-family: var(--mono);
}
.bell-panel {
  position: absolute; top: 40px; right: -40px; width: 320px; max-height: 420px;
  background: #fff; border: 1px solid var(--border); box-shadow: 0 6px 24px rgba(0,0,0,.12); z-index: 100;
  display: flex; flex-direction: column;
}
.bell-head {
  display: flex; justify-content: space-between; align-items: center; padding: 10px 12px;
  border-bottom: 1px solid var(--border); font-family: var(--serif); font-weight: 900; font-size: 14px;
}
.bell-head a { font-size: 12px; color: var(--primary); text-decoration: none; font-family: -apple-system, sans-serif; font-weight: 400; }
.bell-list { overflow-y: auto; }
.bell-item { display: flex; flex-direction: column; gap: 2px; padding: 10px 12px; border-bottom: 1px solid #f0f0f0; text-decoration: none; }
.bell-item:hover { background: #fafaf8; }
.bell-item.unread .bell-text { font-weight: 600; }
.bell-item.unread { border-left: 3px solid var(--primary); padding-left: 9px; }
.bell-text { font-size: 13px; color: var(--ink); line-height: 1.5; }
.bell-time { font-size: 11px; color: var(--muted); }
.bell-empty { padding: 24px; text-align: center; color: var(--muted); font-size: 13px; }
@media (max-width: 700px) { .bell-panel { right: -80px; width: 280px; } }

/* ── 导航搜索框 ───────────────────────────── */
.nav-search { display: flex; }
.nav-search input {
  width: 130px; padding: 5px 10px; font-size: 12.5px; border: 1px solid var(--border);
  background: #FAFAF8; outline: none; transition: width .2s, border-color .15s;
}
.nav-search input:focus { width: 190px; border-color: var(--primary); }
@media (max-width: 860px) { .nav-search { display: none; } }

/* ── 错误页 ───────────────────────────────── */
.err-box { text-align: center; }
.err-kicker { color: var(--primary); font-size: 12px; letter-spacing: .25em; margin-bottom: 10px; }
.err-title { font-family: var(--serif); font-weight: 900; font-size: 40px; margin-bottom: 10px; }
.err-sub { color: var(--muted); font-size: 14px; margin-bottom: 22px; }

/* ── 移动端导航收纳 ───────────────────────── */
@media (max-width: 700px) {
  .nav-inner { padding: 0 12px; max-width: 100%; }
  .main { max-width: 100%; padding: 32px 16px 48px; }
  .footer-inner { max-width: 100%; }
  .nav-links { gap: 12px; }
  .nav-links a:not(.btn), .nav-user { white-space: nowrap; font-size: 13px; }
  .nav-user { display: none; }
  .nav-links a[href="/announcements"], .nav-links a[href="/tools/library"] { display: none; }
  .brand { font-size: 17px; }
}