/* ============================================================
   太素脉诀 · 共享样式
   视觉方向：宣纸医书 · 墨色 · 朱砂印章 · 五行五色
   ============================================================ */

:root{
  /* 纸底与墨色 */
  --paper:#f6f1e7;
  --paper-deep:#efe7d6;
  --paper-soft:#fbf8f0;
  --ink:#26221c;
  --ink-soft:#4a443b;
  --ink-faint:#7a7266;
  --line:#d8cfbb;
  --line-strong:#b9ad92;
  /* 朱砂印章 */
  --cinnabar:#b03a2e;
  --cinnabar-deep:#8e2f24;
  /* 五行五色 */
  --wu-fire:#c0392b;   /* 火赤 */
  --wu-earth:#d19a3e;  /* 土黄 */
  --wu-metal:#aeb6bd;  /* 金白 */
  --wu-water:#264d70;  /* 水青黑 */
  --wu-wood:#3f7d4e;   /* 木青 */
  --ok:#2f6b46; --warn:#b5852a; --bad:#a83232;

  --radius:10px;
  --shadow:0 6px 20px rgba(58,48,32,.10);
  --maxw:1120px;
}

*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0;
  font-family:"Noto Sans SC","Microsoft YaHei","PingFang SC",system-ui,-apple-system,"Segoe UI",sans-serif;
  background:
    radial-gradient(1200px 600px at 85% -10%, rgba(176,58,46,.06), transparent 60%),
    radial-gradient(900px 500px at -10% 20%, rgba(63,125,78,.05), transparent 55%),
    var(--paper);
  color:var(--ink);
  line-height:1.75;
  font-size:16px;
}
h1,h2,h3,h4{font-family:"Noto Serif SC","Songti SC","SimSun",serif;line-height:1.3;color:var(--ink);margin:0 0 .5em}

/* 顶部导航 */
.topbar{
  position:sticky;top:0;z-index:60;
  background:rgba(251,248,240,.92);
  backdrop-filter:blur(8px);
  border-bottom:1px solid var(--line);
}
.topbar-inner{max-width:var(--maxw);margin:0 auto;display:flex;align-items:center;gap:12px;padding:10px 18px}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--ink);min-width:0}
.brand-seal{
  width:38px;height:38px;flex:none;border-radius:8px;background:var(--cinnabar);color:#fdf6e9;
  display:flex;align-items:center;justify-content:center;font-family:"Noto Serif SC",serif;font-weight:700;
  font-size:15px;letter-spacing:.5px;box-shadow:inset 0 0 0 1px rgba(255,255,255,.25);
}
.brand-name{font-family:"Noto Serif SC",serif;font-weight:700;font-size:18px;white-space:nowrap}
.brand-name small{display:block;font-size:10px;font-weight:400;color:var(--ink-faint);letter-spacing:2px;font-family:"Noto Sans SC",sans-serif}
.nav{margin-left:auto;display:flex;align-items:center;gap:2px}
.nav a{
  text-decoration:none;color:var(--ink-soft);padding:8px 12px;border-radius:8px;font-size:15px;
  transition:background .18s,color .18s;white-space:nowrap;
}
.nav a:hover{background:var(--paper-deep);color:var(--ink)}
.nav a.active{color:var(--cinnabar);font-weight:600;background:rgba(176,58,46,.08)}
.nav-toggle{display:none;margin-left:auto;background:none;border:1px solid var(--line-strong);border-radius:8px;width:42px;height:40px;cursor:pointer;color:var(--ink);align-items:center;justify-content:center}
.nav-toggle svg{width:22px;height:22px}

.wrap{max-width:var(--maxw);margin:0 auto;padding:22px 18px 60px}

/* 印章式页眉 */
.page-head{display:flex;align-items:flex-end;gap:14px;margin:6px 0 22px;border-bottom:2px solid var(--ink);padding-bottom:12px}
.page-seal{flex:none;width:52px;height:52px;border-radius:10px;background:var(--cinnabar);color:#fdf6e9;display:flex;align-items:center;justify-content:center;font-family:"Noto Serif SC",serif;font-weight:700;font-size:20px;box-shadow:inset 0 0 0 1px rgba(255,255,255,.25)}
.page-head h1{font-size:26px;margin:0}
.page-head p{margin:2px 0 0;color:var(--ink-faint);font-size:14px}
.eyebrow{font-size:12px;letter-spacing:3px;color:var(--cinnabar);font-weight:600;margin-bottom:2px}

/* 卡片 */
.grid{display:grid;gap:16px}
.grid-2{grid-template-columns:repeat(auto-fit,minmax(300px,1fr))}
.grid-3{grid-template-columns:repeat(auto-fit,minmax(250px,1fr))}
.card{background:var(--paper-soft);border:1px solid var(--line);border-radius:var(--radius);padding:18px 18px;box-shadow:var(--shadow)}
.card h3{margin-top:0;font-size:18px}
.card h3 .seal-dot{color:var(--cinnabar)}

/* 五行色块 */
.wu{display:inline-block;width:.72em;height:.72em;border-radius:50%;vertical-align:.06em;margin-right:5px}
.wu-fire{background:var(--wu-fire)} .wu-earth{background:var(--wu-earth)} .wu-metal{background:var(--wu-metal);box-shadow:inset 0 0 0 1px #999}
.wu-water{background:var(--wu-water)} .wu-wood{background:var(--wu-wood)}

/* 按钮 */
.btn{display:inline-flex;align-items:center;gap:8px;padding:10px 18px;border-radius:9px;border:1px solid var(--line-strong);background:var(--paper-soft);color:var(--ink);cursor:pointer;font-size:15px;text-decoration:none;transition:all .18s}
.btn:hover{border-color:var(--cinnabar);color:var(--cinnabar)}
.btn-primary{background:var(--cinnabar);border-color:var(--cinnabar);color:#fdf6e9}
.btn-primary:hover{background:var(--cinnabar-deep);color:#fff}
.btn-ghost{background:transparent}
button.btn{font-family:inherit}
.btn.small{padding:6px 12px;font-size:13px}

/* 英雄区 */
.hero{
  position:relative;border-radius:14px;overflow:hidden;border:1px solid var(--line-strong);
  min-height:360px;display:flex;align-items:flex-end;color:#f6f1e7;
}
.hero-img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}
.hero-shade{position:absolute;inset:0;background:linear-gradient(180deg,rgba(20,16,10,.10) 0%,rgba(20,16,10,.72) 78%)}
.hero-body{position:relative;z-index:2;padding:26px 24px;max-width:640px}
.hero-kicker{font-size:12px;letter-spacing:4px;color:#e8b54d;font-weight:600}
.hero h1{color:#fff;font-size:clamp(26px,5vw,40px);margin:.2em 0 .2em}
.hero p{color:#eee6d8;margin:0 0 14px;font-size:15px}
.hero .btn{background:rgba(255,255,255,.14);border-color:rgba(255,255,255,.45);color:#fff;backdrop-filter:blur(4px)}
.hero .btn:hover{background:var(--cinnabar);border-color:var(--cinnabar)}

/* 段落 & 分隔 */
.section-title{display:flex;align-items:center;gap:10px;margin:34px 0 14px}
.section-title .rule{flex:1;height:1px;background:var(--line-strong)}
.section-title h2{font-size:22px;margin:0;white-space:nowrap}
.section-title h2 span{color:var(--cinnabar);font-size:14px;margin-right:8px;letter-spacing:2px}
.muted{color:var(--ink-faint)}
.small{font-size:13px}

/* 表格 */
.table-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:var(--radius);background:var(--paper-soft)}
table{border-collapse:collapse;width:100%;font-size:14px;min-width:520px}
th,td{padding:10px 12px;text-align:left;border-bottom:1px solid var(--line)}
thead th{background:var(--paper-deep);font-weight:600;color:var(--ink);position:sticky;top:0}
tbody tr:hover{background:#f1e9d8}
td .tag{display:inline-block;padding:1px 8px;border-radius:20px;font-size:12px;margin-right:4px}
.tag-fire{background:rgba(192,57,43,.12);color:var(--wu-fire)}
.tag-earth{background:rgba(209,154,62,.16);color:#8a5d14}
.tag-metal{background:rgba(174,182,189,.25);color:#4b5560}
.tag-water{background:rgba(38,77,112,.14);color:var(--wu-water)}
.tag-wood{background:rgba(63,125,78,.14);color:var(--wu-wood)}
.tag-cinn{background:rgba(176,58,46,.10);color:var(--cinnabar)}

/* 交互控件 */
.searchbar{display:flex;gap:8px;flex-wrap:wrap;align-items:center}
.searchbar input[type=text]{flex:1;min-width:200px;padding:11px 14px;border:1px solid var(--line-strong);border-radius:9px;background:var(--paper-soft);font-size:15px;color:var(--ink);font-family:inherit}
.searchbar input:focus{outline:none;border-color:var(--cinnabar);box-shadow:0 0 0 3px rgba(176,58,46,.12)}
select{padding:10px 12px;border:1px solid var(--line-strong);border-radius:9px;background:var(--paper-soft);font-family:inherit;font-size:14px;color:var(--ink)}
.chips{display:flex;flex-wrap:wrap;gap:8px;margin:10px 0}
.chip{padding:6px 12px;border:1px solid var(--line-strong);border-radius:20px;background:var(--paper-soft);cursor:pointer;font-size:13px;color:var(--ink-soft);transition:all .15s;font-family:inherit}
.chip:hover{border-color:var(--cinnabar);color:var(--cinnabar)}
.chip.active{background:var(--cinnabar);border-color:var(--cinnabar);color:#fff}

/* 结果列表 */
.result-item{border:1px solid var(--line);border-radius:var(--radius);padding:14px 16px;margin-bottom:12px;background:var(--paper-soft)}
.result-item h4{margin:0 0 4px;font-size:16px;color:var(--cinnabar-deep)}
.result-item .vol{font-size:12px;color:var(--ink-faint);letter-spacing:1px}
.result-item p{margin:6px 0 0;color:var(--ink-soft);font-size:14px}
mark{background:rgba(176,58,46,.18);color:var(--ink);border-radius:3px;padding:0 2px}

/* 学习卡 */
.flashcard{min-height:220px;display:flex;flex-direction:column;justify-content:center;text-align:center;cursor:pointer;user-select:none;perspective:900px}
.flashcard .fc-inner{position:relative;transition:transform .5s;transform-style:preserve-3d;width:100%}
.flashcard.flipped .fc-inner{transform:rotateY(180deg)}
.fc-face{backface-visibility:hidden;border-radius:12px;padding:22px;min-height:210px;display:flex;flex-direction:column;justify-content:center;align-items:center}
.fc-front{background:var(--paper-deep);border:1px solid var(--line-strong)}
.fc-back{position:absolute;inset:0;transform:rotateY(180deg);background:var(--paper-soft);border:1px solid var(--line-strong);color:var(--ink-soft)}

/* 五行环 / 图容器 */
.diagram-box{border:1px solid var(--line);border-radius:12px;background:var(--paper-soft);padding:14px;min-height:320px}
.diagram-box.full{width:100%;min-height:340px}
figure{margin:0}
figure img{width:100%;height:auto;border-radius:8px;border:1px solid var(--line)}
figcaption{font-size:12px;color:var(--ink-faint);margin-top:6px;text-align:center}

/* 测验 */
.quiz-q{font-family:"Noto Serif SC",serif;font-size:18px;margin-bottom:14px}
.quiz-opt{display:block;width:100%;text-align:left;padding:12px 14px;margin:8px 0;border:1px solid var(--line-strong);border-radius:9px;background:var(--paper-soft);cursor:pointer;font-size:15px;font-family:inherit;transition:all .15s}
.quiz-opt:hover{border-color:var(--cinnabar)}
.quiz-opt.correct{background:rgba(47,107,70,.14);border-color:var(--ok);color:var(--ok)}
.quiz-opt.wrong{background:rgba(168,50,50,.12);border-color:var(--bad);color:var(--bad)}
.quiz-opt:disabled{cursor:default}
.score-badge{font-size:14px;color:var(--ink-faint)}

/* 统计条 */
.stat{text-align:center;padding:10px}
.stat b{display:block;font-family:"Noto Serif SC",serif;font-size:30px;color:var(--cinnabar);line-height:1.1}
.stat span{font-size:13px;color:var(--ink-faint)}

/* 页脚 */
.footer{border-top:1px solid var(--line);background:var(--paper-deep);padding:26px 18px;margin-top:40px}
.footer-inner{max-width:var(--maxw);margin:0 auto;display:flex;flex-wrap:wrap;gap:16px;justify-content:space-between;align-items:center;font-size:13px;color:var(--ink-faint)}
.footer-inner .seal{width:30px;height:30px;border-radius:7px;background:var(--cinnabar);color:#fdf6e9;display:inline-flex;align-items:center;justify-content:center;font-weight:700;font-size:13px}

/* 提示条 */
.notice{border-left:4px solid var(--cinnabar);background:rgba(176,58,46,.06);padding:12px 16px;border-radius:8px;font-size:14px;color:var(--ink-soft)}
.notice b{color:var(--cinnabar-deep)}

/* 响应式 */
@media (max-width:860px){
  .nav{position:fixed;inset:auto 12px 12px 12px;flex-direction:column;align-items:stretch;background:var(--paper-soft);border:1px solid var(--line-strong);border-radius:14px;box-shadow:var(--shadow);padding:8px;display:none;z-index:70}
  .nav.open{display:flex}
  .nav a{padding:12px 14px;border-radius:10px;font-size:16px}
  .nav-toggle{display:flex}
  .hero{min-height:300px}
  .stat b{font-size:24px}
  .page-head h1{font-size:22px}
}
@media (prefers-reduced-motion:reduce){
  *{transition:none!important;animation:none!important}
  .flashcard .fc-inner{transition:none}
}