:root {
  --bg: #0e0b12;
  --bg-soft: #17121e;
  --card: #1c1526;
  --gold: #c9a86a;
  --gold-dim: #8a744c;
  --crimson: #a63d5a;
  --text: #e8ddcf;
  --text-dim: #9a8fa3;
  --line: #2c2238;
}

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

body {
  background: var(--bg);
  color: var(--text);
  font-family: "Noto Serif SC", "Songti SC", "STSong", serif;
  min-height: 100vh;
}

/* ---------- 入馆确认 ---------- */
.gate {
  position: fixed; inset: 0; z-index: 100;
  background: rgba(8, 5, 12, 0.97);
  display: flex; align-items: center; justify-content: center;
}
.gate.hidden { display: none; }
.gate-card {
  text-align: center; padding: 48px 56px;
  border: 1px solid var(--gold-dim); border-radius: 12px;
  background: var(--bg-soft); max-width: 420px;
}
.gate-title { font-size: 40px; color: var(--gold); letter-spacing: 12px; margin-bottom: 8px; }
.gate-sub { color: var(--text-dim); font-size: 14px; letter-spacing: 4px; margin-bottom: 24px; }
.gate-desc { font-size: 14px; line-height: 2; color: var(--text-dim); margin-bottom: 28px; }
.gate-btn {
  display: block; width: 100%; margin: 10px 0; padding: 12px;
  background: var(--crimson); color: #fff; border: none; border-radius: 6px;
  font-size: 16px; font-family: inherit; cursor: pointer; letter-spacing: 2px;
}
.gate-btn.ghost { background: transparent; border: 1px solid var(--line); color: var(--text-dim); }

/* ---------- 页眉 ---------- */
.site-header {
  border-bottom: 1px solid var(--line);
  background: linear-gradient(180deg, #141021, #0e0b12);
  padding: 36px 20px 28px; text-align: center;
}
.logo { font-size: 44px; color: var(--gold); letter-spacing: 14px; text-indent: 14px; }
.logo-sub { color: var(--text-dim); font-size: 13px; letter-spacing: 6px; margin-top: 10px; }
.logo-meta { color: var(--text-dim); font-size: 13px; letter-spacing: 4px; margin-top: 12px; }
.logo-meta .meta-dot { margin: 0 10px; color: var(--gold-dim); }
.search-box { margin-top: 22px; }
.search-box input {
  width: min(420px, 90%); padding: 10px 18px; border-radius: 24px;
  border: 1px solid var(--line); background: var(--bg-soft); color: var(--text);
  font-family: inherit; font-size: 14px; outline: none;
}
.search-box input:focus { border-color: var(--gold-dim); }

/* ---------- 筛选 ---------- */
.filters { max-width: 1080px; margin: 0 auto; padding: 20px 20px 0; }
.filter-row { display: flex; align-items: flex-start; gap: 12px; margin-bottom: 12px; }
.filter-label {
  flex-shrink: 0; font-size: 13px; color: var(--gold-dim);
  border: 1px solid var(--line); border-radius: 4px; padding: 6px 10px;
  letter-spacing: 2px; margin-top: 2px;
}
.chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chip {
  font-size: 13px; padding: 7px 16px; border-radius: 20px; cursor: pointer;
  border: 1px solid var(--line); color: var(--text-dim); background: transparent;
  font-family: inherit; transition: all 0.2s;
}
.chip:hover { border-color: var(--gold-dim); color: var(--text); }
.chip.active { background: var(--crimson); border-color: var(--crimson); color: #fff; }

/* ---------- 书架 ---------- */
.book-grid {
  max-width: 1080px; margin: 0 auto; padding: 24px 20px 60px;
  display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 20px;
}
.book-card {
  background: var(--card); border: 1px solid var(--line); border-radius: 10px;
  overflow: hidden; cursor: pointer; transition: transform 0.2s, border-color 0.2s;
}
.book-card:hover { transform: translateY(-4px); border-color: var(--gold-dim); }
.book-cover {
  height: 150px; display: flex; align-items: flex-end; padding: 16px;
  position: relative;
}
.book-cover::after {
  content: ""; position: absolute; inset: 0;
  background: linear-gradient(180deg, transparent 30%, rgba(0,0,0,0.55));
}
.book-cover h3 { position: relative; z-index: 1; font-size: 21px; letter-spacing: 2px; }
.cover-bl  { background: linear-gradient(135deg, #1b2a5e, #4a2a6e); }
.cover-gl  { background: linear-gradient(135deg, #5e1b3a, #8e2a52); }
.cover-bg  { background: linear-gradient(135deg, #5e1b1b, #a66a2a); }
.cover-rw  { background: linear-gradient(135deg, #0f4a3a, #1b5e5e); }
.cover-abo { background: linear-gradient(135deg, #3a1b5e, #a64a2a); }
.cover-dr  { background: linear-gradient(135deg, #5e1b4a, #8e1b1b); }
.cover-xy  { background: linear-gradient(135deg, #4a1b2a, #7a2a3a); }
.cover-ss  { background: linear-gradient(135deg, #1b3a5e, #2a6e8e); }
.cover-zn  { background: linear-gradient(135deg, #2a1b4a, #5e1b5e); }
.cover-ntr { background: linear-gradient(135deg, #3a3a1b, #6e5e1b); }
.cover-tj  { background: linear-gradient(135deg, #4a1b1b, #7a3a1b); }
.cover-zc  { background: linear-gradient(135deg, #1b4a3a, #2a7a5e); }
.cover-ll  { background: linear-gradient(135deg, #3a2a1b, #8e6a2a); }
.cover-sf  { background: linear-gradient(135deg, #1b1b4a, #3a3a7a); }
.cover-hx  { background: linear-gradient(135deg, #0f2a4a, #4a1b6e); }
.cover-nx  { background: linear-gradient(135deg, #5e1b3a, #a34a6e); }
.cover-sj  { background: linear-gradient(135deg, #4a2c10, #8a5a1e); }
.cover-cs  { background: linear-gradient(135deg, #0e3a2e, #4a1b6e); }
.cover-sm  { background: linear-gradient(135deg, #6e1b1b, #c9962e); }
.cover-jx  { background: linear-gradient(135deg, #1b2a3a, #5a7a9e); }
.cover-hg  { background: linear-gradient(135deg, #4a1b4e, #a34a9e); }
.cover-jj  { background: linear-gradient(135deg, #2a0e0e, #7a1b1b); }
.cover-dl  { background: linear-gradient(135deg, #23233a, #4a4a7a); }
.cover-qz  { background: linear-gradient(135deg, #1a1a1a, #7a1b2e); }
.cover-rs  { background: linear-gradient(135deg, #5e2e3a, #c97a8e); }
.cover-cy  { background: linear-gradient(135deg, #0e3a4a, #2e8e9e); }
.book-info { padding: 16px 18px 18px; }
.book-tags { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 10px; }
.tag {
  font-size: 12px; color: var(--gold); border: 1px solid var(--gold-dim);
  border-radius: 4px; padding: 2px 8px;
}
.book-desc { font-size: 13.5px; color: var(--text-dim); line-height: 1.9; }
.book-words { margin-top: 10px; font-size: 12px; color: var(--gold-dim); letter-spacing: 1px; }

.empty-state { text-align: center; padding: 80px 20px; color: var(--text-dim); }
.empty-state.hidden { display: none; }

/* ---------- 页脚 ---------- */
.site-footer {
  text-align: center; padding: 36px 20px; color: var(--text-dim);
  font-size: 12px; line-height: 2.2; border-top: 1px solid var(--line);
}

/* ---------- 阅读器 ---------- */
.reader {
  position: fixed; inset: 0; z-index: 50; overflow-y: auto;
  background: var(--bg);
}
.reader.hidden { display: none; }
.reader.theme-sepia { background: #f4ecd8; color: #4a3f30; }
.reader.theme-sepia .reader-content p { color: #4a3f30; }
.reader.theme-light { background: #fafafa; color: #222; }
.reader.theme-light .reader-content p { color: #222; }

.reader-progress {
  position: sticky; top: 0; height: 3px; background: var(--line); z-index: 51;
}
#progress-bar { height: 100%; width: 0; background: var(--crimson); }

.reader-topbar {
  position: sticky; top: 3px; z-index: 51;
  display: flex; justify-content: space-between; align-items: center;
  padding: 12px 20px; background: rgba(14, 11, 18, 0.92);
  border-bottom: 1px solid var(--line); backdrop-filter: blur(6px);
}
.reader.theme-sepia .reader-topbar,
.reader.theme-light .reader-topbar { background: rgba(244, 236, 216, 0.94); }
.icon-btn {
  background: transparent; border: 1px solid var(--line); color: var(--text);
  border-radius: 6px; padding: 7px 14px; cursor: pointer;
  font-family: inherit; font-size: 13px; margin-left: 8px;
}
#reader-back { margin-left: 0; }
.reader.theme-sepia .icon-btn, .reader.theme-light .icon-btn { color: #4a3f30; }

.reader-body { max-width: 720px; margin: 0 auto; padding: 48px 24px 80px; }
.reader-body h1 { text-align: center; font-size: 30px; letter-spacing: 6px; margin-bottom: 14px; }
.reader-meta { text-align: center; color: var(--text-dim); font-size: 13px; margin-bottom: 40px; letter-spacing: 1px; }
.reader-content p {
  font-size: 18px; line-height: 2.2; margin-bottom: 1.4em;
  text-align: justify; color: var(--text);
}
.reader-end { text-align: center; color: var(--gold-dim); letter-spacing: 8px; margin: 60px 0 30px; }
.back-btn {
  display: block; margin: 0 auto; padding: 12px 48px;
  background: var(--crimson); color: #fff; border: none; border-radius: 6px;
  font-family: inherit; font-size: 15px; cursor: pointer; letter-spacing: 4px;
}

@media (max-width: 640px) {
  /* ---------- 页眉 ---------- */
  .site-header { padding: 24px 16px 20px; }
  .logo { font-size: 30px; letter-spacing: 8px; text-indent: 8px; }
  .logo-sub { font-size: 12px; letter-spacing: 3px; margin-top: 8px; }
  .logo-meta { font-size: 12px; letter-spacing: 2px; margin-top: 10px; line-height: 2; }
  .logo-meta .meta-dot { margin: 0 8px; }
  .search-box { margin-top: 16px; }

  /* ---------- 入馆确认 ---------- */
  .gate-card { margin: 0 20px; padding: 36px 28px; }
  .gate-title { font-size: 30px; letter-spacing: 8px; text-indent: 8px; }
  .gate-sub { letter-spacing: 2px; }

  /* ---------- 筛选：改为横滑 ---------- */
  .filters { padding: 14px 0 0; }
  .filter-row { gap: 8px; margin-bottom: 10px; padding: 0 16px; align-items: center; }
  .filter-label { font-size: 12px; padding: 6px 8px; letter-spacing: 1px; white-space: nowrap; margin-top: 0; }
  .chips {
    flex: 1; min-width: 0; flex-wrap: nowrap; overflow-x: auto;
    -webkit-overflow-scrolling: touch; scrollbar-width: none;
    margin: 0 -16px; padding: 2px 16px 6px;
  }
  .chips::-webkit-scrollbar { display: none; }
  .chip { flex-shrink: 0; font-size: 12px; padding: 6px 13px; }

  /* ---------- 书架 ---------- */
  .book-grid { padding: 16px 16px 48px; gap: 14px; grid-template-columns: 1fr; }
  .book-cover { height: 118px; padding: 14px; }
  .book-cover h3 { font-size: 18px; }
  .book-info { padding: 12px 14px 14px; }
  .book-desc { font-size: 13px; line-height: 1.8; }

  /* ---------- 页脚 ---------- */
  .site-footer { padding: 28px 16px; }

  /* ---------- 阅读器 ---------- */
  .reader-topbar { padding: 10px 12px; }
  .icon-btn { padding: 6px 10px; font-size: 12px; margin-left: 6px; }
  .reader-body { padding: 32px 18px 64px; }
  .reader-body h1 { font-size: 23px; letter-spacing: 4px; line-height: 1.6; }
  .reader-meta { margin-bottom: 28px; }
  .reader-content p { font-size: 17px; line-height: 2; }
}