/* ============================================================
   藏书阁 · 战斗力量库 —— 高级感深色主题
   ============================================================ */
:root {
  --bg: #0c0e14;
  --bg-2: #12141d;
  --panel: rgba(28, 32, 46, 0.82);
  --panel-solid: #1c2030;
  --border: rgba(255, 255, 255, 0.08);
  --border-hover: rgba(230, 180, 80, 0.5);
  --text: #eef0f7;
  --muted: #9aa4bc;
  --accent: #e6b450;
  --accent-2: #d97d3f;
  --accent-soft: rgba(230, 180, 80, 0.14);
  --danger: #f06565;
  --ok: #57c78b;
  --radius: 16px;
  --shadow: 0 12px 40px rgba(0, 0, 0, 0.45);
  --font-serif: "Noto Serif SC", "Songti SC", serif;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
  font-family: -apple-system, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  background:
    radial-gradient(1200px 600px at 80% -10%, rgba(230, 180, 80, 0.10), transparent 60%),
    radial-gradient(1000px 500px at -20% 20%, rgba(120, 90, 240, 0.08), transparent 55%),
    linear-gradient(160deg, var(--bg) 0%, var(--bg-2) 100%);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
}
.bg-glow {
  position: fixed; inset: 0; z-index: -1; pointer-events: none;
  background: radial-gradient(600px 300px at 50% -5%, rgba(230,180,80,0.06), transparent 70%);
}
a { color: var(--accent); text-decoration: none; transition: color .15s; }
a:hover { color: #f3ce84; }
::selection { background: var(--accent-soft); }

/* ---------- 导航 ---------- */
#navbar {
  display: flex; align-items: center; gap: 22px;
  padding: 16px 32px;
  border-bottom: 1px solid var(--border);
  background: rgba(12, 14, 20, 0.75);
  backdrop-filter: blur(14px);
  position: sticky; top: 0; z-index: 50;
}
.nav-brand { display: flex; align-items: center; gap: 10px; font-family: var(--font-serif); }
.brand-mark {
  width: 34px; height: 34px; display: grid; place-items: center;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #15120a; font-weight: 700; border-radius: 10px; font-size: 1rem;
  box-shadow: 0 4px 14px rgba(230, 180, 80, 0.35);
}
.brand-text { font-weight: 700; font-size: 1.15rem; letter-spacing: 1px; color: var(--text); }
.brand-sub { font-size: 0.72rem; font-weight: 400; color: var(--muted); margin-left: 6px; letter-spacing: 0.5px; }
.nav-links { display: flex; gap: 22px; flex: 1; margin-left: 10px; }
.nav-links a { color: var(--muted); font-size: 0.95rem; position: relative; padding: 4px 0; }
.nav-links a:hover { color: var(--text); }
.nav-links a[data-active] { color: var(--text); font-weight: 600; }
.nav-links a[data-active]::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: -2px;
  height: 2px; border-radius: 2px; background: linear-gradient(90deg, var(--accent), var(--accent-2));
}
.nav-right { display: flex; gap: 10px; align-items: center; }

.container { max-width: 1000px; margin: 0 auto; padding: 34px 24px 40px; animation: fadeUp .35s ease; }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  padding: 9px 18px;
  border: 1px solid var(--border); border-radius: 10px;
  background: var(--panel-solid); color: var(--text);
  cursor: pointer; font-size: 0.92rem; font-family: inherit;
  transition: transform .12s, box-shadow .12s, border-color .12s, background .12s;
}
.btn:hover { transform: translateY(-1px); border-color: var(--border-hover); }
.btn:active { transform: translateY(0); }
.btn-primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #15120a; border: none; font-weight: 700;
  box-shadow: 0 6px 20px rgba(230, 180, 80, 0.3);
}
.btn-primary:hover { box-shadow: 0 8px 24px rgba(230, 180, 80, 0.4); }
.btn-ghost { background: transparent; }
.btn-danger { background: rgba(240, 101, 101, 0.12); color: var(--danger); border-color: rgba(240,101,101,0.35); }
.btn-block { width: 100%; }
.btn-sm { padding: 6px 13px; font-size: 0.85rem; border-radius: 8px; }
.btn:disabled { opacity: 0.55; cursor: not-allowed; transform: none; }

/* ---------- 卡片 ---------- */
.auth-card, .form-section {
  max-width: 460px; margin: 34px auto;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px 34px;
  backdrop-filter: blur(10px);
  box-shadow: var(--shadow);
}
.auth-card h2, .form-section h2 {
  font-family: var(--font-serif); font-size: 1.5rem; margin-bottom: 6px;
}
.form-section { max-width: 100%; }
.form-section h2 { margin-top: 6px; }

/* ---------- 表单 ---------- */
.form-group { margin-bottom: 18px; }
.form-group label { display: block; font-size: 0.85rem; color: var(--muted); margin-bottom: 8px; letter-spacing: .3px; }
.form-group input, .form-group textarea, .form-group select {
  width: 100%; padding: 12px 14px;
  border: 1px solid var(--border); border-radius: 10px;
  background: rgba(12, 14, 20, 0.7); color: var(--text);
  font-size: 0.95rem; font-family: inherit;
  transition: border-color .15s, box-shadow .15s;
}
.form-group textarea { resize: vertical; min-height: 220px; }
.form-group input:focus, .form-group textarea:focus, .form-group select:focus {
  outline: none; border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}
.form-group input::placeholder, .form-group textarea::placeholder { color: #5b6378; }

/* ---------- 页面头部 ---------- */
.page-head { margin-bottom: 26px; }
.page-head h1 { font-family: var(--font-serif); font-size: 1.9rem; margin-bottom: 6px; letter-spacing: .5px; }
.subtitle { color: var(--muted); font-size: 0.92rem; }
.back { color: var(--muted); font-size: 0.9rem; display: inline-flex; align-items: center; gap: 4px; }
.back:hover { color: var(--accent); }

/* ---------- 搜索 ---------- */
.search-bar { margin-bottom: 22px; }
.search-bar input {
  width: 100%; padding: 13px 18px;
  border: 1px solid var(--border); border-radius: 12px;
  background: var(--panel); color: var(--text); font-size: 0.95rem;
  backdrop-filter: blur(8px);
  transition: border-color .15s, box-shadow .15s;
}
.search-bar input:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft); }

/* ---------- 文档网格 ---------- */
.doc-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(290px, 1fr)); gap: 18px; }
.doc-card {
  background: var(--panel); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 20px 22px; display: block; color: var(--text);
  backdrop-filter: blur(8px);
  transition: transform .15s, border-color .15s, box-shadow .15s;
  position: relative; overflow: hidden;
}
.doc-card::before {
  content: ""; position: absolute; top: 0; left: 0; right: 0; height: 2px;
  background: linear-gradient(90deg, var(--accent), transparent); opacity: 0; transition: opacity .2s;
}
.doc-card:hover { transform: translateY(-4px); border-color: var(--border-hover); box-shadow: var(--shadow); }
.doc-card:hover::before { opacity: 1; }
.doc-card-title { font-weight: 600; font-size: 1.05rem; margin-bottom: 6px; color: var(--text); }
.doc-card-title:hover { color: var(--accent); }
.doc-card-meta { font-size: 0.8rem; color: var(--muted); margin-bottom: 10px; }
.doc-card-summary {
  font-size: 0.86rem; color: var(--muted);
  display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden;
}
.doc-actions { margin-top: 14px; display: flex; gap: 10px; }
.tag-mine { color: var(--accent); font-size: 0.75rem; border: 1px solid var(--accent); padding: 1px 8px; border-radius: 6px; margin-left: 6px; }

/* ---------- 阅读页 ---------- */
.reading-head { margin-bottom: 22px; }
.reading-head h1 { font-family: var(--font-serif); font-size: 2rem; margin: 10px 0 8px; }
.reading-body {
  background: var(--panel); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 30px 34px; backdrop-filter: blur(8px);
}
.reading-body p { margin: 0 0 1em; font-size: 1rem; }
hr { border: none; border-top: 1px solid var(--border); margin: 18px 0; }

.empty { color: var(--muted); text-align: center; padding: 60px 0; font-size: 0.98rem; }
.loading { color: var(--muted); text-align: center; padding: 80px 0; }
@keyframes spin { to { transform: rotate(360deg); } }
.loading::before {
  content: ""; display: block; width: 34px; height: 34px; margin: 0 auto 14px;
  border: 3px solid var(--border); border-top-color: var(--accent); border-radius: 50%;
  animation: spin .8s linear infinite;
}

/* ---------- 页脚 ---------- */
.footer {
  text-align: center; padding: 34px 0 40px; color: var(--muted);
  font-size: 0.82rem; letter-spacing: 2px;
}

/* ---------- toast ---------- */
.toast {
  position: fixed; bottom: 28px; left: 50%; transform: translateX(-50%);
  padding: 12px 24px; border-radius: 12px;
  background: var(--panel-solid); border: 1px solid var(--border);
  box-shadow: var(--shadow); z-index: 100; font-size: 0.92rem;
  animation: fadeUp .25s ease;
}
.toast.ok { border-color: rgba(87,199,139,0.6); color: var(--ok); }
.toast.err { border-color: rgba(240,101,101,0.6); color: var(--danger); }

@keyframes fadeUp { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: translateY(0); } }

@media (max-width: 600px) {
  #navbar { padding: 14px 16px; gap: 14px; }
  .container { padding: 24px 16px 30px; }
  .brand-sub { display: none; }
  .doc-grid { grid-template-columns: 1fr; }
  .reading-body { padding: 22px 20px; }
}