:root {
  --brand: #c0392b;
  --brand-dark: #922b21;
  --gold: #d4a017;
  --ink: #2c2416;
  --paper: #fdf6e3;
  --paper-2: #fbeecb;
  --card: #ffffff;
  --shadow: 0 6px 20px rgba(0,0,0,.12);
  --radius: 18px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "KaiTi", serif;
  color: var(--ink);
  background: var(--paper);
  background-image:
    radial-gradient(circle at 15% 12%, rgba(212,160,23,.10), transparent 40%),
    radial-gradient(circle at 85% 88%, rgba(192,57,43,.08), transparent 42%);
  line-height: 1.85;
}
a { color: var(--brand); text-decoration: none; }

/* ===== 顶部横幅 ===== */
.hero {
  position: relative;
  padding: 46px 20px 40px;
  text-align: center;
  color: #fff;
  background: linear-gradient(135deg, #922b21, #c0392b 55%, #d35400);
  overflow: hidden;
}
.hero::before {
  content: "三國";
  position: absolute; right: 6%; top: 50%; transform: translateY(-50%);
  font-size: 200px; font-weight: 900; color: rgba(255,255,255,.08);
  font-family: "STKaiti","KaiTi",serif; letter-spacing: 10px; pointer-events: none;
}
.hero h1 { margin: 0; font-size: 44px; letter-spacing: 6px; text-shadow: 2px 2px 0 rgba(0,0,0,.2); }
.hero .sub { margin-top: 10px; font-size: 17px; opacity: .95; }
.hero .tag {
  display: inline-block; margin-top: 16px; padding: 6px 18px;
  background: rgba(255,255,255,.18); border-radius: 999px; font-size: 14px;
  border: 1px solid rgba(255,255,255,.4);
}

.wrap { max-width: 1100px; margin: 0 auto; padding: 0 18px; }

/* ===== 简介卡 ===== */
.intro {
  margin: -26px auto 30px; max-width: 940px;
  background: var(--card); border-radius: var(--radius);
  box-shadow: var(--shadow); padding: 22px 26px;
  display: flex; gap: 20px; align-items: center; position: relative; z-index: 2;
}
.intro img { width: 96px; border-radius: 10px; box-shadow: 0 3px 10px rgba(0,0,0,.2); }
.intro .txt h2 { margin: 0 0 6px; color: var(--brand-dark); font-size: 22px; }
.intro .txt p { margin: 0; font-size: 15px; color: #5a4a35; }
.intro .meta { margin-top: 8px; font-size: 13px; color: #8a7a60; }

/* ===== 分卷 ===== */
.volume { margin: 34px 0 10px; }
.volume-head {
  display: flex; align-items: center; gap: 12px; margin-bottom: 14px;
  padding: 10px 18px; border-radius: 14px; color: #fff; box-shadow: var(--shadow);
}
.volume-head .vname { font-size: 22px; font-weight: 800; letter-spacing: 2px; }
.volume-head .vrange { font-size: 13px; opacity: .9; }
.volume-head .vdesc { font-size: 14px; opacity: .95; margin-left: auto; }

/* ===== 回目网格 ===== */
.grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(230px, 1fr));
  gap: 16px;
}
.card {
  background: var(--card); border-radius: var(--radius); overflow: hidden;
  box-shadow: var(--shadow); cursor: pointer;
  transition: transform .18s, box-shadow .18s; text-decoration: none; color: inherit;
  display: flex; flex-direction: column;
}
.card:hover { transform: translateY(-6px); box-shadow: 0 12px 28px rgba(0,0,0,.18); }
.card .thumb { aspect-ratio: 5/3; width: 100%; }
.card .thumb svg { width: 100%; height: 100%; display: block; }
.card .body { padding: 12px 14px 16px; }
.card .num {
  display: inline-block; background: var(--paper-2); color: var(--brand-dark);
  font-weight: 800; font-size: 13px; padding: 2px 10px; border-radius: 999px; margin-bottom: 6px;
}
.card .ttl { font-size: 15px; font-weight: 700; color: var(--ink); line-height: 1.5; }

/* ===== 详情页 ===== */
.detail-hero {
  color: #fff; padding: 18px 20px; position: relative; overflow: hidden;
  box-shadow: var(--shadow);
}
.detail-hero .dh-bg { position: absolute; inset: 0; z-index: 0; }
.detail-hero .dh-bg svg { width: 100%; height: 100%; }
.detail-hero .dh-mask { position: absolute; inset: 0; background: rgba(0,0,0,.28); z-index: 1; }
.detail-hero .dh-inner { position: relative; z-index: 2; max-width: 900px; margin: 0 auto; }
.detail-hero .dnum {
  display: inline-block; background: rgba(255,255,255,.22); padding: 3px 12px;
  border-radius: 999px; font-size: 12px; border: 1px solid rgba(255,255,255,.4);
}
.detail-hero h1 { margin: 8px 0 0; font-size: 24px; letter-spacing: 2px; text-shadow: 2px 2px 6px rgba(0,0,0,.4); line-height: 1.4; }

.detail-body { max-width: 900px; margin: 14px auto 40px; padding: 0 16px; }
.section {
  background: var(--card); border-radius: var(--radius); box-shadow: var(--shadow);
  padding: 14px 20px; margin-bottom: 12px;
}
.section h3 {
  margin: 0 0 10px; font-size: 17px; color: var(--brand-dark);
  display: flex; align-items: center; gap: 6px;
}
.section h3 .ico { font-size: 20px; }
.section p { margin: 0; font-size: 15px; color: #4a3b28; text-indent: 1.5em; line-height: 1.7; }

/* 语音朗读按钮 */
.tts-btn {
  display: inline-flex; align-items: center; gap: 4px;
  margin-top: 10px; padding: 6px 14px;
  background: linear-gradient(135deg, #667eea, #764ba2);
  color: #fff; border: none; border-radius: 999px;
  font-size: 13px; font-weight: 600; cursor: pointer;
  transition: all .2s; box-shadow: 0 2px 6px rgba(102,126,234,.3);
}
.tts-btn:hover { transform: translateY(-1px); box-shadow: 0 3px 8px rgba(102,126,234,.4); }
.tts-btn.playing { background: linear-gradient(135deg, #e74c3c, #c0392b); animation: tts-pulse 1.5s ease-in-out infinite; }
@keyframes tts-pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: .7; }
}

/* 每回 AI 插图（图文并茂） */
.chapter-illu {
  display: block; width: 100%; max-width: 700px;
  margin: 0 auto 14px; border-radius: var(--radius);
  box-shadow: var(--shadow); transition: transform .25s;
}
.chapter-illu:hover { transform: scale(1.01); }

/* 人物卡 */
.chars { display: flex; flex-wrap: wrap; gap: 8px; }
.char {
  flex: 1 1 200px; background: var(--paper); border-radius: 10px; padding: 10px 12px;
  border-left: 4px solid var(--gold);
}
.char .cname { font-weight: 800; color: var(--brand-dark); font-size: 14px; }
.char .cdesc { font-size: 13px; color: #6a5940; margin-top: 2px; }

/* 成语 */
.idioms { display: flex; flex-wrap: wrap; gap: 8px; }
.idiom {
  flex: 1 1 220px; background: linear-gradient(135deg,#fff8e1,#ffecb3);
  border-radius: 10px; padding: 10px 14px; border: 1px dashed var(--gold);
}
.idiom .iw { font-size: 16px; font-weight: 800; color: var(--brand); }
.idiom .im { font-size: 13px; color: #6a5940; margin-top: 3px; }

/* 思考题 */
.think {
  background: linear-gradient(135deg,#e8f5e9,#c8e6c9);
  border-radius: var(--radius); padding: 14px 20px; margin-bottom: 12px;
}
.think h3 { color: #1b5e20; }
.think p { text-indent: 0; color: #2e5030; font-size: 15px; }

/* 导航条 */
.navbar {
  position: sticky; top: 0; z-index: 20; background: rgba(146,43,33,.96);
  backdrop-filter: blur(6px); color: #fff; display: flex; align-items: center;
  gap: 10px; padding: 10px 16px; box-shadow: 0 2px 10px rgba(0,0,0,.2);
}
.navbar a, .navbar span { color: #fff; font-size: 14px; }
.navbar .home { font-weight: 800; font-size: 16px; letter-spacing: 1px; }
.navbar .spacer { flex: 1; }
.navbar .navbtn {
  padding: 6px 14px; background: rgba(255,255,255,.18); border-radius: 999px;
  border: 1px solid rgba(255,255,255,.35); transition: background .15s;
}
.navbar .navbtn:hover { background: rgba(255,255,255,.32); }
.navbar .navbtn.disabled { opacity: .35; pointer-events: none; }

/* 底部翻页 */
.pager { display: flex; justify-content: space-between; gap: 12px; margin-top: 10px; }
.pager a {
  flex: 1; background: var(--card); border-radius: 12px; box-shadow: var(--shadow);
  padding: 14px 18px; display: flex; flex-direction: column; transition: transform .15s;
}
.pager a:hover { transform: translateY(-3px); }
.pager .plabel { font-size: 12px; color: #999; }
.pager .pttl { font-size: 14px; font-weight: 700; color: var(--ink); margin-top: 3px; }
.pager .next { text-align: right; align-items: flex-end; }

/* 搜索框 */
.searchbar { max-width: 940px; margin: 20px auto 0; }
.searchbar input {
  width: 100%; padding: 13px 20px; font-size: 16px; border: 2px solid #e0d5b8;
  border-radius: 999px; background: #fff; outline: none;
  font-family: inherit; box-shadow: var(--shadow);
}
.searchbar input:focus { border-color: var(--brand); }

footer { text-align: center; padding: 30px 20px 40px; color: #8a7a60; font-size: 13px; }

@media (max-width: 600px) {
  .hero h1 { font-size: 32px; }
  .hero::before { font-size: 130px; }
  .intro { flex-direction: column; text-align: center; }
  .volume-head { flex-wrap: wrap; }
  .volume-head .vdesc { margin-left: 0; width: 100%; }
  .grid { grid-template-columns: repeat(auto-fill, minmax(150px,1fr)); gap: 12px; }
}