/* ============================================================
   京峰教育 · 技术藏书阁  —  书店风设计系统
   参考当当/京东图书：暖白底 + 藏青墨绿导航 + 金色点缀
   桌面优先，移动端自适应
   ============================================================ */
:root{
  --ink:#20242a;            /* 主文字 */
  --ink-2:#4a525e;          /* 次级文字 */
  --ink-3:#8b93a0;          /* 弱文字 */
  --paper:#f7f4ee;          /* 暖白背景 */
  --card:#ffffff;
  --line:#e7e2d8;
  --deep:#123440;           /* 藏青墨绿 主色 */
  --deep-2:#0d2a34;
  --gold:#c9a35c;           /* 金色 */
  --gold-2:#a98545;
  --gold-bg:#f3e9d3;
  --crimson:#b03a2e;
  --serif:"Noto Serif SC","Songti SC","SimSun",serif;
  --sans:"Noto Sans SC","PingFang SC","Microsoft YaHei","Hiragino Sans GB",sans-serif;
  --shadow:0 10px 30px rgba(18,52,64,.10), 0 2px 8px rgba(18,52,64,.06);
  --shadow-sm:0 2px 10px rgba(18,52,64,.08);
  --r:14px;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:var(--sans);color:var(--ink);background:var(--paper);line-height:1.7;-webkit-font-smoothing:antialiased}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
.wrap{max-width:1200px;margin:0 auto;padding:0 20px}
.wrap-wide{max-width:1400px;margin:0 auto;padding:0 20px}

/* ---------- 顶部导航 ---------- */
.nav{background:linear-gradient(180deg,var(--deep-2),var(--deep));color:#f4efe4;position:sticky;top:0;z-index:100;
  box-shadow:0 2px 18px rgba(0,0,0,.25)}
.nav .wrap{display:flex;align-items:center;gap:22px;height:64px}
.brand{display:flex;align-items:center;gap:10px;font-family:var(--serif);font-size:19px;font-weight:700;letter-spacing:1px;white-space:nowrap}
.brand .logo{width:34px;height:34px;border-radius:8px;background:linear-gradient(135deg,var(--gold),#e2c48b);color:#123440;
  display:flex;align-items:center;justify-content:center;font-size:19px;font-weight:900;box-shadow:inset 0 -2px 0 rgba(0,0,0,.15)}
.nav .cats{display:flex;gap:4px;overflow-x:auto;scrollbar-width:none;flex:1}
.nav .cats::-webkit-scrollbar{display:none}
.nav .cats a{padding:6px 11px;border-radius:8px;font-size:14px;color:#cfd8d0;white-space:nowrap;transition:.2s}
.nav .cats a:hover,.nav .cats a.on{background:rgba(201,163,92,.18);color:#f3dfb2}
.nav .tools{display:flex;align-items:center;gap:10px;white-space:nowrap}
.nav .btn-up{padding:7px 15px;border:1px solid rgba(201,163,92,.65);border-radius:999px;color:#f3dfb2;font-size:13.5px;transition:.2s}
.nav .btn-up:hover{background:var(--gold);color:#123440;border-color:var(--gold)}
.menu-btn{display:none;background:none;border:0;color:#f4efe4;font-size:24px;cursor:pointer;line-height:1}

/* 移动端抽屉菜单 */
.drawer{position:fixed;inset:0;background:rgba(13,42,52,.5);z-index:200;display:none}
.drawer.open{display:block}
.drawer .panel{position:absolute;top:0;left:0;bottom:0;width:min(320px,84vw);background:var(--deep-2);color:#f4efe4;
  padding:24px;overflow-y:auto;box-shadow:8px 0 30px rgba(0,0,0,.35);animation:slide .25s ease}
@keyframes slide{from{transform:translateX(-100%)}to{transform:none}}
.drawer .panel .d-brand{font-family:var(--serif);font-size:20px;font-weight:700;margin-bottom:18px;display:flex;justify-content:space-between;align-items:center}
.drawer .panel a{display:block;padding:11px 6px;border-bottom:1px solid rgba(255,255,255,.07);color:#d8ded6;font-size:15px}
.drawer .panel a:hover{color:#f3dfb2}

/* ---------- 首页 Hero / 推荐位 ---------- */
.hero{background:radial-gradient(1200px 500px at 80% -10%,rgba(201,163,92,.16),transparent 60%),
  linear-gradient(180deg,var(--deep-2),var(--deep) 60%,#0b222b);color:#f4efe4;padding:56px 0 0}
.hero .featured{display:grid;grid-template-columns:300px 1fr;gap:44px;align-items:center;padding-bottom:46px}
.feat-cover{position:relative}
.feat-cover .cover{width:300px;border-radius:6px 16px 16px 6px;box-shadow:24px 30px 60px rgba(0,0,0,.45), 6px 0 0 rgba(0,0,0,.25);
  transform:perspective(900px) rotateY(-4deg)}
.feat-cover .badge{position:absolute;top:-14px;left:-14px;background:linear-gradient(135deg,var(--crimson),#d4543f);color:#fff;
  padding:8px 16px;border-radius:999px;font-size:13px;font-weight:700;box-shadow:0 6px 18px rgba(176,58,46,.45);letter-spacing:1px}
.feat-info .kicker{color:var(--gold);letter-spacing:6px;font-size:13px;font-weight:700;margin-bottom:10px}
.feat-info h1{font-family:var(--serif);font-size:44px;font-weight:900;line-height:1.25;margin-bottom:6px}
.feat-info h1 .accent{color:var(--gold);font-weight:900}
.feat-info .sub{color:#c8d1c8;font-size:16px;max-width:620px;margin:12px 0 20px}
.feat-info .pill{display:inline-flex;align-items:center;gap:8px;background:rgba(201,163,92,.14);border:1px solid rgba(201,163,92,.4);
  color:#f3dfb2;padding:7px 16px;border-radius:999px;font-size:13.5px;margin-bottom:22px}
.stats{display:flex;gap:0;border-top:1px solid rgba(255,255,255,.12);padding-top:22px;max-width:620px}
.stat{flex:1;padding:0 18px;border-right:1px solid rgba(255,255,255,.12)}
.stat:first-child{padding-left:0}
.stat:last-child{border-right:0}
.stat .num{font-family:var(--serif);font-size:30px;font-weight:900;color:#f3dfb2}
.stat .lbl{font-size:12.5px;color:#9fb0a6;letter-spacing:1px;margin-top:2px}

/* ---------- 板块标题 ---------- */
.section{padding:40px 0 8px}
.section-head{display:flex;align-items:baseline;justify-content:space-between;margin-bottom:20px}
.section-head h2{font-family:var(--serif);font-size:26px;font-weight:900;letter-spacing:1px;position:relative;padding-left:16px}
.section-head h2::before{content:"";position:absolute;left:0;top:8px;bottom:8px;width:5px;border-radius:3px;
  background:linear-gradient(180deg,var(--gold),#e0b96f)}
.section-head .more{font-size:13.5px;color:var(--ink-3)}
.section-head .more:hover{color:var(--gold-2)}

/* ---------- 畅销榜（带排名） ---------- */
.rank{background:var(--card);border-radius:var(--r);box-shadow:var(--shadow-sm);padding:20px 22px}
.rank ol{list-style:none}
.rank li{display:flex;align-items:center;gap:16px;padding:12px 6px;border-bottom:1px dashed var(--line)}
.rank li:last-child{border-bottom:0}
.rank .rn{font-family:var(--serif);font-size:22px;font-weight:900;width:34px;text-align:center;flex:none}
.rank li:nth-child(1) .rn{color:var(--crimson)}
.rank li:nth-child(2) .rn{color:#d98a2b}
.rank li:nth-child(3) .rn{color:#b8912f}
.rank li:nth-child(n+4) .rn{color:#c9c2b2}
.rank .rcover{width:44px;border-radius:4px;box-shadow:0 2px 6px rgba(0,0,0,.18);flex:none}
.rank .rname{flex:1;min-width:0;font-weight:600;font-size:15px}
.rank .rname small{display:block;color:var(--ink-3);font-weight:400;font-size:12.5px}
.rank .rmeta{font-size:12.5px;color:var(--ink-3);white-space:nowrap}

/* ---------- 书籍卡片 ---------- */
.grid{display:grid;grid-template-columns:repeat(5,1fr);gap:26px 22px}
.card{background:var(--card);border-radius:var(--r);overflow:hidden;box-shadow:var(--shadow-sm);transition:.25s;
  display:flex;flex-direction:column;position:relative}
.card:hover{transform:translateY(-6px);box-shadow:var(--shadow)}
.card .cov{position:relative;aspect-ratio:3/4;overflow:hidden;background:linear-gradient(160deg,#eef0f3,#dde2e8)}
.card .cov img{width:100%;height:100%;object-fit:cover;transition:.4s}
.card:hover .cov img{transform:scale(1.05)}
.card .tag{position:absolute;top:10px;left:10px;background:rgba(18,52,64,.82);color:#f3dfb2;font-size:11.5px;
  padding:3px 10px;border-radius:999px;letter-spacing:1px;backdrop-filter:blur(4px)}
.card .tag.hot{background:linear-gradient(135deg,var(--crimson),#d4543f);color:#fff}
.card .vol{position:absolute;top:10px;right:10px;background:rgba(0,0,0,.55);color:#fff;font-size:11px;
  padding:3px 8px;border-radius:6px;backdrop-filter:blur(4px)}
.card .info{padding:12px 14px 14px;display:flex;flex-direction:column;gap:4px;flex:1}
.card .name{font-weight:700;font-size:15px;line-height:1.4;display:-webkit-box;-webkit-line-clamp:1;-webkit-box-orient:vertical;overflow:hidden}
.card .meta{font-size:12px;color:var(--ink-3);display:flex;justify-content:space-between;align-items:center}
.card .go{margin-top:auto;padding-top:8px;border-top:1px dashed var(--line);display:flex;justify-content:space-between;align-items:center;
  font-size:12.5px;color:var(--gold-2);font-weight:600}
.card .go .ic{transition:.2s}
.card:hover .go .ic{transform:translateX(4px)}

/* ---------- 工具栏（搜索+分类） ---------- */
.toolbar{background:var(--card);border-bottom:1px solid var(--line);padding:16px 0;position:sticky;top:64px;z-index:90;
  box-shadow:0 4px 14px rgba(18,52,64,.05)}
.search{position:relative;max-width:560px;margin:0 auto 14px}
.search svg{position:absolute;left:14px;top:50%;transform:translateY(-50%);color:var(--ink-3)}
.search input{width:100%;padding:12px 16px 12px 44px;border:1.5px solid var(--line);border-radius:999px;font-size:15px;
  font-family:var(--sans);outline:none;background:var(--paper);transition:.2s}
.search input:focus{border-color:var(--gold);box-shadow:0 0 0 4px rgba(201,163,92,.15);background:#fff}
.chips{display:flex;gap:8px;justify-content:center;flex-wrap:wrap}
.chip{padding:6px 15px;border-radius:999px;border:1px solid var(--line);font-size:13px;color:var(--ink-2);cursor:pointer;transition:.2s;background:#fff}
.chip:hover{border-color:var(--gold);color:var(--gold-2)}
.chip.on{background:var(--deep);color:#f3dfb2;border-color:var(--deep)}
.empty{text-align:center;color:var(--ink-3);padding:60px 0;font-size:15px}

/* ---------- 分类浏览 ---------- */
.cat-grid{display:grid;grid-template-columns:repeat(6,1fr);gap:16px}
.cat-cell{background:var(--card);border-radius:var(--r);box-shadow:var(--shadow-sm);padding:18px 10px;text-align:center;cursor:pointer;transition:.2s}
.cat-cell:hover{transform:translateY(-4px);box-shadow:var(--shadow);border-color:transparent}
.cat-cell .ic{width:46px;height:46px;margin:0 auto 10px;border-radius:12px;display:flex;align-items:center;justify-content:center;
  font-size:22px;background:var(--gold-bg)}
.cat-cell .nm{font-size:14px;font-weight:600}
.cat-cell .ct{font-size:12px;color:var(--ink-3)}

/* ---------- 书籍详情页 ---------- */
.book-hero{background:linear-gradient(150deg,#fdfbf6,#f1ead9);border-bottom:1px solid var(--line);padding:44px 0 40px}
.book-hero .wrap{display:grid;grid-template-columns:260px 1fr;gap:40px;align-items:start}
.bh-cover{position:relative}
.bh-cover .cover{width:260px;border-radius:6px 14px 14px 6px;box-shadow:18px 22px 46px rgba(18,52,64,.28), 5px 0 0 rgba(0,0,0,.18)}
.bh-cover .tag{position:absolute;top:-12px;left:-12px;background:linear-gradient(135deg,var(--crimson),#d4543f);color:#fff;
  padding:6px 14px;border-radius:999px;font-size:12.5px;font-weight:700;box-shadow:0 6px 16px rgba(176,58,46,.4)}
.bh-crumb{font-size:13px;color:var(--ink-3);margin-bottom:12px}
.bh-crumb a:hover{color:var(--gold-2)}
.bh-cat{display:inline-block;background:var(--gold-bg);color:var(--gold-2);font-size:12.5px;padding:4px 13px;border-radius:999px;
  letter-spacing:2px;font-weight:600;margin-bottom:12px}
.bh-info h1{font-family:var(--serif);font-size:34px;font-weight:900;line-height:1.3;margin-bottom:8px}
.bh-meta{display:flex;gap:18px;color:var(--ink-3);font-size:13.5px;margin-bottom:16px;flex-wrap:wrap}
.bh-meta b{color:var(--ink-2);font-weight:600}
.bh-desc{color:var(--ink-2);font-size:15px;max-width:720px;margin-bottom:22px;line-height:1.8}
.bh-desc .expand{display:none}
.bh-acts{display:flex;gap:12px;flex-wrap:wrap}
.btn{display:inline-flex;align-items:center;gap:8px;padding:12px 26px;border-radius:10px;font-size:15px;font-weight:700;
  font-family:var(--sans);cursor:pointer;border:0;transition:.2s}
.btn-primary{background:linear-gradient(135deg,var(--gold),#d9b36a);color:#123440;box-shadow:0 8px 20px rgba(201,163,92,.35)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 12px 26px rgba(201,163,92,.45)}
.btn-ghost{background:#fff;border:1.5px solid var(--line);color:var(--ink-2)}
.btn-ghost:hover{border-color:var(--gold);color:var(--gold-2)}
.btn-dark{background:var(--deep);color:#f3dfb2}
.btn-dark:hover{background:var(--deep-2)}
.bh-side{grid-column:2;display:flex;gap:14px;margin-top:4px;flex-wrap:wrap}
.bh-stat{background:#fff;border:1px solid var(--line);border-radius:12px;padding:12px 20px;text-align:center}
.bh-stat .n{font-family:var(--serif);font-size:20px;font-weight:900;color:var(--deep)}
.bh-stat .l{font-size:12px;color:var(--ink-3)}

/* 卷切换 */
.vol-tabs{display:flex;gap:10px;flex-wrap:wrap;margin:0 0 8px}
.vol-tab{padding:8px 18px;border-radius:999px;background:#fff;border:1px solid var(--line);font-size:14px;color:var(--ink-2);cursor:pointer;transition:.2s}
.vol-tab:hover{border-color:var(--gold)}
.vol-tab.active{background:var(--deep);color:#f3dfb2;border-color:var(--deep);font-weight:600}
.vol-panel{display:none}
.vol-panel.active{display:block;animation:fade .3s ease}
@keyframes fade{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}

/* ---------- 正文文档排版（详情页内嵌 & 阅读器共用） ---------- */
.doc{background:#fff;border-radius:var(--r);box-shadow:var(--shadow-sm);padding:44px 52px;font-size:16px;line-height:2}
.doc h1.doc-h1,.doc h2.doc-h1{font-family:var(--serif);font-size:28px;font-weight:900;margin:34px 0 16px;padding-bottom:12px;border-bottom:2px solid var(--gold-bg)}
.doc h2.doc-h2{font-family:var(--serif);font-size:22px;font-weight:800;margin:28px 0 12px;color:var(--deep)}
.doc h3.doc-h3{font-family:var(--serif);font-size:18px;font-weight:700;margin:22px 0 10px;color:var(--ink-2)}
.doc p.doc-p{margin:12px 0;color:var(--ink-2)}
.doc ul.doc-ul,.doc ol.doc-ol{margin:12px 0 12px 26px;color:var(--ink-2)}
.doc li.doc-li{margin:5px 0}
.doc table.doc-table{width:100%;border-collapse:collapse;margin:16px 0;font-size:14px}
.doc table.doc-table th,.doc table.doc-table td{border:1px solid var(--line);padding:9px 13px;text-align:left}
.doc table.doc-table th{background:var(--gold-bg);color:var(--deep);font-weight:700}
.doc table.doc-table tr:nth-child(even) td{background:#faf8f2}
.doc code.doc-code{background:#f0ede4;color:#8a5a12;padding:2px 7px;border-radius:5px;font-size:.92em;font-family:Consolas,Menlo,monospace}
.doc pre.doc-pre{background:#10242c;color:#d8e3da;border-radius:10px;padding:18px 20px;overflow-x:auto;margin:16px 0;font-size:13.5px;line-height:1.7}
.doc pre.doc-pre code{background:none;color:inherit;padding:0}
.doc blockquote.doc-quote{border-left:4px solid var(--gold);background:var(--gold-bg);margin:14px 0;padding:10px 18px;color:var(--ink-2);border-radius:0 8px 8px 0}
.doc strong{color:var(--deep)}

/* ---------- 阅读器（移动端友好） ---------- */
.reader-top{background:var(--deep-2);color:#eef2e9;position:sticky;top:0;z-index:90}
.reader-top .wrap{display:flex;align-items:center;gap:14px;height:54px}
.reader-top .rt-title{font-family:var(--serif);font-weight:700;font-size:15px;flex:1;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.reader-top button{background:none;border:0;color:#d8ded6;font-size:15px;cursor:pointer;padding:6px 10px;border-radius:8px}
.reader-top button:hover{background:rgba(255,255,255,.1)}
.reader-wrap{max-width:760px;margin:0 auto;padding:10px 20px 60px}
.reader-title{font-family:var(--serif);font-size:26px;font-weight:900;text-align:center;margin:26px 0 6px;color:var(--deep)}
.reader-sub{text-align:center;color:var(--ink-3);font-size:13px;margin-bottom:10px}
.reader-bar{position:sticky;top:54px;background:rgba(247,244,238,.95);backdrop-filter:blur(8px);z-index:80;display:flex;
  align-items:center;gap:10px;padding:10px 0;border-bottom:1px solid var(--line);flex-wrap:wrap}
.reader-bar .rbtn{background:#fff;border:1px solid var(--line);border-radius:8px;padding:6px 13px;font-size:13px;color:var(--ink-2);cursor:pointer;font-family:var(--sans)}
.reader-bar .rbtn.on{background:var(--deep);color:#f3dfb2;border-color:var(--deep)}
.reader-bar .sp{flex:1}
.reader-bar .progress{font-size:12px;color:var(--ink-3)}
.reader-body{padding:8px 0}
.reader-body.dark{background:#16222a;border-radius:12px;padding:14px 22px}
.reader-body.dark .doc{background:#16222a;box-shadow:none}
.reader-body.dark .doc p,.reader-body.dark .doc li,.reader-body.dark .doc td{color:#c9d4ca}
.reader-body.dark .doc h1,.reader-body.dark .doc h2,.reader-body.dark .doc h3{color:#f3dfb2;border-color:rgba(201,163,92,.25)}
.reader-body.dark .doc table th{background:rgba(201,163,92,.15);color:#f3dfb2}
.reader-body.dark .doc code{background:rgba(255,255,255,.08);color:#e0c386}
.font-a .doc{font-size:17px}
.font-b .doc{font-size:19px}
.font-c .doc{font-size:21px}
.chap-pager{display:flex;justify-content:space-between;gap:10px;margin-top:30px}
.chap-pager a{flex:1;text-align:center;padding:13px;border-radius:10px;background:#fff;border:1px solid var(--line);font-size:14px;color:var(--ink-2);transition:.2s}
.chap-pager a:hover{border-color:var(--gold);color:var(--gold-2)}
.chap-pager a.disabled{opacity:.35;pointer-events:none}

/* 目录抽屉（阅读器） */
.toc-drawer{position:fixed;inset:0;background:rgba(13,42,52,.5);z-index:150;display:none}
.toc-drawer.open{display:block}
.toc-drawer .panel{position:absolute;top:0;right:0;bottom:0;width:min(340px,88vw);background:#fff;box-shadow:-8px 0 30px rgba(0,0,0,.25);
  padding:20px;overflow-y:auto}
.toc-drawer .panel h4{font-family:var(--serif);margin-bottom:12px;color:var(--deep)}
.toc-drawer .toc-link{display:block;padding:9px 10px;border-radius:8px;font-size:14px;color:var(--ink-2);border-bottom:1px dashed var(--line)}
.toc-drawer .toc-link:hover{background:var(--gold-bg)}
.toc-drawer .toc-link.lvl2{padding-left:24px;font-size:13px}
.toc-drawer .toc-link.lvl3{padding-left:38px;font-size:12.5px;color:var(--ink-3)}
.toc-drawer .toc-link.cur{background:var(--gold-bg);color:var(--gold-2);font-weight:700}

/* ---------- 上传页 ---------- */
.up-hero{background:linear-gradient(160deg,#fdfbf6,#f1ead9);border-bottom:1px solid var(--line);padding:46px 0;text-align:center}
.up-hero h1{font-family:var(--serif);font-size:32px;font-weight:900;color:var(--deep)}
.up-hero p{color:var(--ink-2);margin-top:8px;max-width:640px;margin-left:auto;margin-right:auto}
.dropzone{margin:36px auto 0;max-width:680px;background:#fff;border:2.5px dashed var(--gold);border-radius:20px;padding:54px 30px;
  text-align:center;cursor:pointer;transition:.25s}
.dropzone:hover,.dropzone.drag{border-color:var(--gold-2);background:var(--gold-bg)}
.dropzone .dz-ic{font-size:46px;margin-bottom:14px}
.dropzone .dz-t{font-size:18px;font-weight:700;color:var(--deep)}
.dropzone .dz-s{font-size:13.5px;color:var(--ink-3);margin-top:6px}
.dropzone input{display:none}
.uploaded{max-width:680px;margin:26px auto 0;display:none}
.uploaded .file{display:flex;align-items:center;gap:14px;background:#fff;border:1px solid var(--line);border-radius:12px;padding:14px 18px;margin-bottom:10px}
.uploaded .file .fi{font-size:26px}
.uploaded .file .fn{flex:1;font-weight:600;font-size:14.5px;word-break:break-all}
.uploaded .file .fs{font-size:12px;color:var(--ink-3)}
.up-steps{max-width:680px;margin:34px auto 0;text-align:left}
.up-steps h3{font-family:var(--serif);color:var(--deep);margin-bottom:12px;font-size:17px}
.up-steps ol{margin-left:22px;color:var(--ink-2);font-size:14px}
.up-steps li{margin:7px 0}

/* ---------- 页脚 ---------- */
.footer{background:var(--deep-2);color:#9fb0a6;margin-top:60px;padding:40px 0}
.footer .wrap{display:flex;justify-content:space-between;gap:20px;flex-wrap:wrap}
.footer .fbrand{font-family:var(--serif);font-size:18px;color:#f3dfb2;font-weight:700}
.footer a{color:#c8d1c8}
.footer a:hover{color:var(--gold)}
.footer .cols{display:flex;gap:60px}
.footer .cols .c-title{color:#f3dfb2;font-size:13px;letter-spacing:2px;margin-bottom:10px}
.footer .cols div a{display:block;font-size:13.5px;padding:3px 0}

/* ---------- 响应式 ---------- */
@media (max-width:1024px){
  .grid{grid-template-columns:repeat(4,1fr)}
  .cat-grid{grid-template-columns:repeat(4,1fr)}
}
@media (max-width:860px){
  .nav .cats{display:none}
  .nav .btn-up{display:none}
  .menu-btn{display:block}
  .hero .featured{grid-template-columns:1fr;gap:28px;text-align:center;justify-items:center}
  .feat-info .sub,.feat-info .stats{max-width:none}
  .stats{flex-wrap:wrap}
  .stat{min-width:45%;padding:10px 14px;border-bottom:1px solid rgba(255,255,255,.1)}
  .book-hero .wrap{grid-template-columns:1fr;justify-items:center;text-align:center}
  .bh-side{grid-column:1;justify-content:center}
  .bh-acts{justify-content:center}
  .grid{grid-template-columns:repeat(3,1fr);gap:16px}
  .cat-grid{grid-template-columns:repeat(3,1fr)}
  .toolbar{top:0}
  .doc{padding:26px 20px;font-size:15.5px}
  .feat-info h1{font-size:34px}
}
@media (max-width:560px){
  .grid{grid-template-columns:repeat(2,1fr);gap:14px}
  .cat-grid{grid-template-columns:repeat(3,1fr);gap:10px}
  .card .name{font-size:14px}
  .card .info{padding:10px 11px 12px}
  .rank{padding:14px}
  .reader-bar .rbtn{padding:5px 10px;font-size:12px}
  .doc{padding:20px 16px}
  .section-head h2{font-size:22px}
}

/* 阅读器：PC 宽屏左侧常驻目录 + 移动端保留抽屉 */
.reader-wrap{display:grid;grid-template-columns:280px 1fr;gap:30px;max-width:1100px;margin:0 auto;padding:10px 20px 60px}
.reader-main{min-width:0}
.side-toc{position:sticky;top:124px;align-self:start;max-height:calc(100vh - 150px);overflow-y:auto;background:var(--card);border:1px solid var(--line);border-radius:12px;padding:14px 12px;box-shadow:var(--shadow-sm)}
.side-toc h4{font-family:var(--serif);color:var(--deep);font-size:15px;letter-spacing:2px;margin-bottom:10px;padding-bottom:8px;border-bottom:1px solid var(--line)}
.side-toc .toc-link{display:block;padding:7px 10px;border-radius:8px;font-size:13.5px;color:var(--ink-2);border-bottom:1px dashed var(--line);line-height:1.5;word-break:break-all}
.side-toc .toc-link:last-child{border-bottom:0}
.side-toc .toc-link:hover{background:var(--gold-bg);color:var(--gold-2)}
.side-toc .toc-link.lvl2{padding-left:22px;font-size:12.5px}
.side-toc .toc-link.lvl3{padding-left:36px;font-size:12px;color:var(--ink-3)}
.side-toc .toc-link.cur{background:var(--gold-bg);color:var(--gold-2);font-weight:700}
/* PC 宽屏：左侧已有常驻目录，隐藏顶部"目录"按钮；窄屏保留 */
@media (min-width:861px){
  .reader-top #btn-toc { display: none; }
}
@media (max-width:860px){
  .reader-wrap{grid-template-columns:1fr;max-width:760px}
  .side-toc{display:none}
}

/* =====================================================================
   移动端专属 · 手机 App 风格（≤480px 全量，≤860px 部分生效）
   ===================================================================== */
@media (max-width:480px){
  /* ---- 底部 Tab 导航栏（App 风格，JS 注入） ---- */
  .mtab{display:flex;position:fixed;left:0;right:0;bottom:0;height:58px;background:rgba(255,255,255,.94);
    backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);border-top:1px solid #e9e3d7;z-index:300;
    box-shadow:0 -6px 24px rgba(18,52,64,.08)}
  .mtab a{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:3px;
    font-size:10.5px;color:#7c8894;text-decoration:none;font-weight:600}
  .mtab a.on{color:#a07a35}
  .mtab a .mi{font-size:20px;line-height:1}
  body{padding-bottom:64px}
  .footer{padding-bottom:70px}

  /* ---- 导航：紧凑 ---- */
  .nav .wrap{padding:10px 12px}
  .nav .logo{width:28px;height:28px;font-size:15px}
  .nav .brand{font-size:16px}
  .nav .cats{display:none}
  .nav .btn-up{padding:7px 12px;font-size:12px}
  .nav-user-name{font-size:11.5px}

  /* ---- 签到横幅紧凑 ---- */
  .signin-card{padding:12px 14px !important;gap:10px !important}
  .signin-card>div:first-child{font-size:30px !important}
  .signin-card .signin-go{padding:8px 16px !important;font-size:13px !important}

  /* ---- 首页 hero 紧凑 ---- */
  .hero{padding:20px 0 10px}
  .featured{grid-template-columns:1fr}
  .feat-cover{display:none}
  .feat-info h1{font-size:28px !important}
  .feat-info .kicker{font-size:10px}
  .feat-info .sub{font-size:13.5px;line-height:1.8}
  .stats .stat{min-width:25%}
  .stat .num{font-size:26px}
  .stats{gap:8px}

  /* ---- 畅销榜：横滑 ---- */
  .rank ol{display:flex;overflow-x:auto;gap:10px;padding:4px 2px 8px;-webkit-overflow-scrolling:touch}
  .rank li{flex:0 0 86%;min-width:86%;scroll-snap-align:start}
  .rank li .rname{font-size:14px}
  .rank li .rcover{width:56px;height:56px;border-radius:10px}
  .rank li .rmeta{font-size:12px;padding:6px 14px}

  /* ---- 分类浏览：2 列大格 ---- */
  .cat-grid{grid-template-columns:repeat(3,1fr);gap:10px}
  .cat-cell{padding:12px 6px}
  .cat-cell .ic{font-size:24px}
  .cat-cell .nm{font-size:12px}
  .cat-cell .ct{font-size:10.5px}

  /* ---- 工具条 ---- */
  .toolbar{padding:10px 0}
  .toolbar .wrap{padding:0 12px}
  .search input{font-size:14px;padding:10px 14px}
  .chips{display:flex;overflow-x:auto;gap:8px;padding:8px 2px;-webkit-overflow-scrolling:touch}
  .chip{flex:0 0 auto;padding:6px 14px;font-size:12.5px}

  /* ---- 全部著作标题 ---- */
  .section-head{padding:0 14px}
  .section-head h2{font-size:20px}
  .section-head .more,.section-head .hint{font-size:11.5px}

  /* ---- 详情页 ---- */
  .book-hero .wrap{padding:0 14px}
  .bh-cover .cover{width:130px;height:180px}
  .bh-cat{font-size:12px;padding:3px 10px}
  .bh-info h1{font-size:22px}
  .bh-meta span{font-size:12px;padding:5px 10px}
  .bh-desc{font-size:13.5px;line-height:1.8}
  .bh-acts .btn{padding:11px 22px;font-size:14px}
  .vol-tabs{overflow-x:auto;display:flex;gap:6px;padding-bottom:6px}
  .vol-tab{flex:0 0 auto;padding:9px 16px;font-size:13px}
  .vol-head{padding:12px 14px}
  .vol-title{font-size:16px}
  .vmeta{font-size:11.5px}
  .vacts .btn{padding:9px 14px;font-size:13px}

  /* ---- 阅读器 ---- */
  .reader-top .wrap{padding:10px 10px}
  .reader-top button{font-size:13px;padding:6px 10px}
  .rt-title{font-size:13px;max-width:52%;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
  .reader-wrap{padding:4px 0 30px}
  .reader-title{font-size:24px}
  .reader-sub{font-size:12.5px}
  .reader-bar .rbtn{padding:7px 12px;font-size:13px}
  .reader-bar .progress{font-size:12px}
  .doc{padding:20px 14px;font-size:16px;line-height:1.9;border-radius:10px}
  .doc h1{font-size:22px}
  .doc h2{font-size:18.5px}
  .doc h3{font-size:16px}
  .doc table{font-size:13px}
  .chap-pager a{padding:11px 16px;font-size:14px}
  .toc-drawer .panel{width:88vw}
  .toc-link{padding:10px 12px;font-size:14.5px}

  /* ---- 上传页 ---- */
  .dropzone{padding:34px 18px}
  .dz-t{font-size:15px}
  .dz-s{font-size:12px}

  /* ---- 管理页 ---- */
  .ad-wrap{padding:12px 8px 70px}
  .ad-top{padding:16px 14px}
  .ad-top h1{font-size:18px}
  .ad-stats{grid-template-columns:repeat(2,1fr);gap:8px}
  .ad-stat{padding:14px 8px}
  .ad-stat .n{font-size:24px}
  .ad-tabs{padding:4px;overflow-x:auto}
  .ad-tab{padding:9px 14px;font-size:12.5px;white-space:nowrap}
  .ad-card{padding:14px 10px}
  table{font-size:12px}
  th,td{padding:8px 5px}
}

@media (max-width:860px) and (min-width:481px){
  /* 平板：保留桌面布局但紧凑 */
  .grid{grid-template-columns:repeat(3,1fr);gap:14px}
  .doc{padding:26px 22px}
}

/* 阅读器鉴权提示（未登录/待授权全屏卡片） */
.reader-tip{max-width:560px;margin:48px auto;padding:44px 32px;background:var(--card);border:1px solid var(--line);border-radius:18px;text-align:center;box-shadow:var(--shadow-sm)}
.reader-tip .btn{display:inline-block;padding:11px 26px;border-radius:10px;font-size:14.5px;font-weight:700;text-decoration:none;margin:0 4px}
.reader-tip .btn-primary{background:linear-gradient(135deg,#c9a35c,#a07a35);color:#fff;border:0}
.reader-tip .btn{border:1.5px solid #c9a35c;color:#7a4f10;background:#fff}