:root {
  --primary: #1f3a5f;
  --primary-dark: #16304d;
  --accent: #2a9d8f;
  --bg: #f5f7fa;
  --surface: #ffffff;
  --text: #1f2933;
  --muted: #667085;
  --border: #e3e8ef;
  --line: #eef2f7;
  --shadow: 0 6px 22px rgba(31, 58, 95, 0.08);
  --radius: 14px;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
.ico { vertical-align: middle; flex: none; }

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
}
.header-inner {
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 20px;
  height: 66px;
  display: flex;
  align-items: center;
  gap: 18px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 18px;
  color: var(--primary);
  white-space: nowrap;
}
.brand-name { letter-spacing: 0.5px; }
.nav {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-left: 14px;
}
.nav-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 12px;
  border-radius: 9px;
  color: var(--muted);
  font-size: 15px;
  transition: background 0.15s, color 0.15s;
}
.nav-link:hover { background: var(--line); color: var(--primary); }
.nav-link.active { background: var(--primary); color: #fff; }
.nav-link.admin-link { color: var(--accent); }
.header-auth { margin-left: auto; display: flex; align-items: center; gap: 8px; }
.menu-toggle { display: none; background: none; border: none; color: var(--primary); cursor: pointer; margin-left: auto; }

/* ---------- Layout ---------- */
.container { max-width: 1180px; margin: 0 auto; padding: 28px 20px 60px; }
.section-title { display: flex; align-items: center; gap: 10px; font-size: 22px; color: var(--primary); margin: 6px 0 18px; }
.section-title .bar { width: 5px; height: 22px; background: var(--accent); border-radius: 3px; }

/* ---------- Hero ---------- */
.hero {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  color: #fff;
  border-radius: 0 0 26px 26px;
  padding: 54px 20px 60px;
}
.hero-inner { max-width: 1180px; margin: 0 auto; }
.hero h1 { font-size: 34px; margin: 0 0 12px; font-weight: 800; letter-spacing: 1px; }
.hero p { font-size: 16px; opacity: 0.9; max-width: 640px; margin: 0 0 22px; }
.hero-search { display: flex; gap: 10px; max-width: 560px; }
.hero-search input {
  flex: 1; padding: 13px 16px; border-radius: 10px; border: none; font-size: 15px; outline: none;
}
.hero-search button { padding: 0 22px; }

/* ---------- Buttons ---------- */
.btn-primary, .btn-ghost, .btn-accent {
  display: inline-flex; align-items: center; gap: 7px; justify-content: center;
  padding: 11px 20px; border-radius: 10px; font-size: 15px; cursor: pointer;
  border: 1px solid transparent; transition: all 0.15s; font-weight: 600;
}
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); }
.btn-accent { background: var(--accent); color: #fff; }
.btn-accent:hover { filter: brightness(1.05); }
.btn-ghost { background: transparent; border-color: var(--border); color: var(--text); }
.btn-ghost:hover { border-color: var(--primary); color: var(--primary); }
.btn-sm { padding: 7px 13px; font-size: 14px; }
.btn-danger { background: #b42318; color: #fff; border-color: #b42318; }
.btn-danger:hover { filter: brightness(1.05); }
button[disabled] { opacity: 0.55; cursor: not-allowed; }

/* ---------- Category bar ---------- */
.cat-bar { display: flex; flex-wrap: wrap; gap: 10px; margin: 18px 0 26px; }
.cat-chip {
  display: inline-flex; align-items: center; gap: 7px;
  padding: 9px 15px; border: 1px solid var(--border); border-radius: 999px;
  background: var(--surface); color: var(--muted); font-size: 14px; cursor: pointer; transition: all 0.15s;
}
.cat-chip:hover { border-color: var(--primary); color: var(--primary); }
.cat-chip.active { background: var(--primary); color: #fff; border-color: var(--primary); }

/* ---------- Cards ---------- */
.grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.card {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  overflow: hidden; display: flex; flex-direction: column; transition: transform 0.15s, box-shadow 0.15s; cursor: pointer;
}
.card:hover { transform: translateY(-3px); box-shadow: var(--shadow); }
.card-cover { aspect-ratio: 16/10; background: var(--line); position: relative; overflow: hidden; }
.card-cover img { width: 100%; height: 100%; object-fit: cover; }
.card-badge {
  position: absolute; top: 10px; left: 10px; display: inline-flex; align-items: center; gap: 5px;
  background: rgba(42,157,143,0.95); color: #fff; font-size: 12px; padding: 4px 9px; border-radius: 999px;
}
.card-body { padding: 14px 16px 18px; display: flex; flex-direction: column; gap: 8px; flex: 1; }
.card-title { font-size: 16px; font-weight: 700; color: var(--primary); line-height: 1.45; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.card-cat { display: inline-flex; align-items: center; gap: 5px; color: var(--accent); font-size: 13px; }
.card-summary { color: var(--muted); font-size: 13.5px; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.card-meta { margin-top: auto; display: flex; align-items: center; justify-content: space-between; color: var(--muted); font-size: 12.5px; padding-top: 6px; border-top: 1px solid var(--line); }

/* ---------- Empty / loading ---------- */
.empty { text-align: center; padding: 60px 20px; color: var(--muted); }
.empty .ico { width: 46px; height: 46px; color: var(--border); }
.spinner { text-align: center; padding: 50px; color: var(--muted); }

/* ---------- Detail ---------- */
.detail-back { display: inline-flex; align-items: center; gap: 6px; color: var(--muted); margin-bottom: 16px; cursor: pointer; }
.detail-back:hover { color: var(--primary); }
.detail-wrap { display: grid; grid-template-columns: 1.4fr 1fr; gap: 26px; }
.detail-main { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 22px; }
.detail-cover { width: 100%; border-radius: 12px; margin-bottom: 18px; border: 1px solid var(--line); }
.detail-main h1 { font-size: 24px; color: var(--primary); margin: 0 0 12px; }
.detail-content { white-space: pre-wrap; color: #344; font-size: 15px; line-height: 1.85; }
.detail-side { display: flex; flex-direction: column; gap: 16px; }
.side-card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 18px; }
.side-card h3 { margin: 0 0 14px; color: var(--primary); font-size: 16px; display: flex; align-items: center; gap: 8px; }
.side-row { display: flex; align-items: center; gap: 9px; padding: 8px 0; border-bottom: 1px solid var(--line); font-size: 14px; }
.side-row:last-child { border-bottom: none; }
.side-row .ico { color: var(--accent); }

/* ---------- Forms ---------- */
.form-card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 26px; max-width: 720px; margin: 0 auto; }
.form-row { margin-bottom: 18px; }
.form-row label { display: block; font-weight: 600; margin-bottom: 7px; font-size: 14.5px; color: var(--primary); }
.form-row .hint { font-weight: 400; color: var(--muted); font-size: 12.5px; margin-left: 6px; }
input[type=text], input[type=password], input[type=email], input[type=tel], select, textarea {
  width: 100%; padding: 12px 14px; border: 1px solid var(--border); border-radius: 10px; font-size: 15px; outline: none; background: #fff; transition: border 0.15s; font-family: inherit;
}
input:focus, select:focus, textarea:focus { border-color: var(--primary); }
textarea { min-height: 150px; resize: vertical; }
.field-error { color: #b42318; font-size: 13px; margin-top: 6px; min-height: 18px; }

/* 协议勾选 */
.agree-box { border: 1px solid var(--border); border-radius: 10px; padding: 14px 16px; background: var(--line); }
.agree-row { display: flex; align-items: flex-start; gap: 10px; margin: 8px 0; font-size: 14px; color: var(--text); }
.agree-row input { margin-top: 4px; width: 16px; height: 16px; }
.agree-row a { color: var(--accent); text-decoration: underline; }

/* 封面上传 */
.cover-preview { margin-top: 10px; width: 220px; border-radius: 10px; border: 1px solid var(--border); overflow: hidden; }
.cover-preview img { width: 100%; }
.file-btn { display: inline-flex; align-items: center; gap: 7px; }

/* ---------- Account / Admin ---------- */
.tabs { display: flex; gap: 8px; border-bottom: 1px solid var(--border); margin-bottom: 20px; flex-wrap: wrap; }
.tab { padding: 10px 16px; cursor: pointer; color: var(--muted); border-bottom: 2px solid transparent; font-size: 15px; }
.tab.active { color: var(--primary); border-bottom-color: var(--primary); font-weight: 600; }
.profile-card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 22px; display: flex; align-items: center; gap: 18px; margin-bottom: 22px; }
.profile-avatar { width: 64px; height: 64px; border-radius: 50%; background: var(--primary); color: #fff; display: flex; align-items: center; justify-content: center; font-size: 26px; font-weight: 700; }
.profile-meta h2 { margin: 0 0 4px; color: var(--primary); font-size: 20px; }
.profile-meta p { margin: 2px 0; color: var(--muted); font-size: 14px; }

.list-table { width: 100%; border-collapse: collapse; background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; }
.list-table th, .list-table td { padding: 13px 14px; text-align: left; border-bottom: 1px solid var(--line); font-size: 14px; }
.list-table th { background: var(--line); color: var(--primary); font-weight: 600; }
.list-table tr:last-child td { border-bottom: none; }
.status-tag { display: inline-flex; align-items: center; gap: 5px; padding: 3px 10px; border-radius: 999px; font-size: 12.5px; }
.status-approved { background: #e6f6f2; color: #1b7a6d; }
.status-pending { background: #fff4e0; color: #b26a00; }
.status-rejected { background: #fdecea; color: #b42318; }
.row-actions { display: flex; gap: 6px; }

/* ---------- Footer ---------- */
.site-footer { background: var(--primary); color: #d6e0ec; margin-top: 40px; }
.footer-inner { max-width: 1180px; margin: 0 auto; padding: 38px 20px 22px; display: grid; grid-template-columns: 1.6fr 1fr 1fr; gap: 30px; }
.footer-brand { display: flex; align-items: center; gap: 9px; color: #fff; font-weight: 700; font-size: 17px; margin-bottom: 12px; }
.footer-desc { font-size: 13.5px; line-height: 1.7; opacity: 0.85; }
.footer-col h4 { color: #fff; font-size: 15px; margin: 0 0 12px; }
.footer-col p { display: flex; align-items: center; gap: 8px; font-size: 13.5px; margin: 7px 0; opacity: 0.92; }
.footer-col a { opacity: 0.92; }
.footer-col a:hover { color: #fff; text-decoration: underline; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,0.14); }
.footer-bottom .copyright { max-width: 1180px; margin: 0 auto; padding: 14px 20px 22px; font-size: 12.5px; display: flex; gap: 8px; flex-wrap: wrap; opacity: 0.85; }
.footer-bottom .copyright a { color: #fff; text-decoration: underline; }

/* ---------- Modal / Toast ---------- */
.modal-overlay { position: fixed; inset: 0; background: rgba(16,24,40,0.45); display: flex; align-items: center; justify-content: center; z-index: 200; }
.modal-box { background: #fff; border-radius: 14px; padding: 24px; width: 340px; max-width: 90vw; box-shadow: var(--shadow); }
.modal-msg { font-size: 15px; margin: 0 0 18px; }
.modal-actions { display: flex; gap: 10px; justify-content: flex-end; }
.toast { position: fixed; top: 80px; left: 50%; transform: translateX(-50%) translateY(-12px); background: var(--primary); color: #fff; padding: 11px 20px; border-radius: 10px; font-size: 14px; opacity: 0; pointer-events: none; transition: all 0.25s; z-index: 300; box-shadow: var(--shadow); }
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }
.toast.error { background: #b42318; }
.toast.success { background: var(--accent); }

/* ---------- About page ---------- */
.about-section { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 26px; margin-bottom: 22px; }
.about-section h2 { color: var(--primary); font-size: 20px; margin: 0 0 14px; display: flex; align-items: center; gap: 9px; }
.about-section p { color: #344; line-height: 1.85; margin: 8px 0; }
.info-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; margin-top: 8px; }
.info-item { border: 1px solid var(--border); border-radius: 10px; padding: 14px 16px; }
.info-item .k { color: var(--muted); font-size: 13px; }
.info-item .v { color: var(--primary); font-weight: 600; font-size: 15px; margin-top: 4px; }
.about-flex { display: grid; grid-template-columns: 1fr 1fr; gap: 22px; }

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
  .grid { grid-template-columns: repeat(2, 1fr); }
  .detail-wrap { grid-template-columns: 1fr; }
  .footer-inner { grid-template-columns: 1fr; }
  .about-flex, .info-grid { grid-template-columns: 1fr; }
}
@media (max-width: 640px) {
  .nav { display: none; position: absolute; top: 66px; left: 0; right: 0; flex-direction: column; background: #fff; border-bottom: 1px solid var(--border); padding: 8px; box-shadow: var(--shadow); }
  .nav.open { display: flex; }
  .nav-link { width: 100%; }
  .menu-toggle { display: inline-flex; }
  .header-auth { display: none; }
  .grid { grid-template-columns: 1fr; }
  .hero h1 { font-size: 26px; }
}