/* ============================================================
   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-user-name{display:inline-flex;align-items:center;gap:5px;color:#f3dfb2}
.nav-avatar{border-radius:50%;background:rgba(255,255,255,.14);border:1px solid rgba(201,163,92,.45);vertical-align:middle}
.nav-logout{font-size:12.5px;color:#c8d1c8;padding:4px 10px;border:1px solid rgba(255,255,255,.18);border-radius:999px}
.nav-logout:hover{color:#fff;border-color:var(--gold)}
.nav-admin{font-size:12.5px;color:#f3dfb2;padding:4px 10px;border:1px solid rgba(201,163,92,.5);border-radius:999px}
.nav-admin:hover{background:var(--gold);color:#123440}
.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}
}

/* =====================================================================
   移动端增强 v2（2026-08-19）
   修复：①正文表格撑破屏幕 → 窄屏可横滑
        ②登录/注册卡片顶满全屏 → 四周留白、头部紧凑
        ③手机端整体视觉细化
   ===================================================================== */

/* ---- ① 正文表格：≤860px 横向滚动，不再撑破页面 ---- */
/* 表格包装层（生成器新版 doc-table-wrap）：窄屏可横滑 */
.doc-table-wrap{max-width:100%;overflow-x:auto;-webkit-overflow-scrolling:touch}
.doc-table-wrap .doc-table{max-width:100%}
@media (max-width:860px){
  .doc{overflow-x:auto;-webkit-overflow-scrolling:touch}
  .doc table.doc-table{display:table;max-width:100%}
  .doc table.doc-table th,.doc table.doc-table td{white-space:nowrap}
  .doc table.doc-table tr:nth-child(even) td{background:#faf8f2}
  .doc pre.doc-pre{max-width:100%;overflow-x:auto}
}

/* ---- ② 登录 / 注册卡片：移动端留白 + 紧凑 ---- */
@media (max-width:480px){
  .lg-card{max-width:none;width:calc(100vw - 28px);margin:32px auto;border-radius:16px}
  .reg-card{max-width:none;width:calc(100vw - 28px);margin:24px auto;border-radius:16px}
  .lg-head{padding:22px 20px 18px}
  .reg-head{padding:20px 20px 16px}
  .lg-head .logo{font-size:19px}
  .reg-head h1{font-size:18px}
  .lg-head p,.reg-head p{font-size:12px;margin-top:6px}
  .lg-body{padding:20px 20px 22px}
  .reg-body{padding:18px 20px 20px}
  .lg-field{margin-bottom:13px}
  .reg-field{margin-bottom:14px}
  .lg-field label,.reg-field label{font-size:12.5px;margin-bottom:5px}
  .lg-field input,.reg-field input{padding:13px 12px;font-size:15px;border-radius:10px}
  .lg-btn,.reg-btn{padding:13px;font-size:15px;border-radius:10px;min-height:46px}
  .lg-foot{padding:0 20px 20px;font-size:13px}
  .reg-foot{padding:0 20px 20px;font-size:13px}
  .reg-tip{font-size:12px;padding:11px 12px;margin:12px 0 18px}
  .lg-msg,.reg-msg{font-size:12.5px;padding:9px 12px}
}

/* ---- ③ 手机端整体视觉细化 ---- */
@media (max-width:480px){
  /* 导航：更紧凑精致 */
  .nav .wrap{height:56px;padding:0 12px;gap:10px}
  .nav .brand{font-size:15px;letter-spacing:.5px;gap:8px}
  .nav .logo{width:26px;height:26px;font-size:14px;border-radius:7px}
  .menu-btn{font-size:22px}

  /* Hero 质感 */
  .hero{background:linear-gradient(180deg,var(--deep-2),var(--deep) 55%,#0b222b);padding:22px 0 6px}
  .featured{gap:20px;padding-bottom:30px}
  .feat-info h1{font-size:25px !important;line-height:1.3}
  .feat-info .kicker{font-size:9.5px;letter-spacing:4px;margin-bottom:8px}
  .feat-info .sub{font-size:13px;line-height:1.75;margin:10px 0 16px}
  .feat-info .pill{font-size:12px;padding:6px 13px;margin-bottom:16px}
  .stats{padding-top:16px}
  .stat .num{font-size:23px}
  .stat .lbl{font-size:10.5px;letter-spacing:.5px}
  .stats .stat{min-width:25%;padding:8px 6px}

  /* 畅销榜横滑卡片 v3：内容单行省略，杜绝文字竖排 */
  .rank{border-radius:14px;padding:10px 8px}
  .rank ol{gap:10px;padding:4px 0 8px}
  .rank li{flex:0 0 90%;min-width:90%;padding:12px 9px;gap:9px;scroll-snap-align:start}
  .rank .rn{font-size:17px;width:22px;flex:none}
  .rank .rcover{width:48px;height:48px;border-radius:9px;flex:none}
  .rank li .rname{font-size:13.5px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;flex:1;min-width:0}
  .rank li .rname small{font-size:11px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
  .rank li .rmeta{font-size:12px;padding:6px 12px;white-space:nowrap;flex:none;border-radius:999px;background:var(--gold-bg)}

  /* 分类浏览 */
  .cat-grid{gap:8px}
  .cat-cell{border-radius:12px;padding:12px 4px}
  .cat-cell .ic{width:40px;height:40px;font-size:20px;margin-bottom:7px;border-radius:10px}
  .cat-cell .nm{font-size:11.5px}
  .cat-cell .ct{font-size:10px}

  /* 书籍卡片 */
  .grid{gap:12px}
  .card{border-radius:12px}
  .card .info{padding:9px 10px 11px;gap:3px}
  .card .name{font-size:13.5px;-webkit-line-clamp:2;line-height:1.4}
  .card .meta{font-size:11px}
  .card .go{font-size:11.5px;padding-top:6px}
  .card .tag{font-size:10.5px;padding:3px 8px}
  .card .vol{font-size:10px;padding:2px 7px}

  /* 签到横幅 */
  .signin-card{padding:13px 15px !important;gap:10px !important;border-radius:14px !important}
  .signin-card>div:first-child{font-size:32px !important}
  .signin-card .signin-go{padding:9px 18px !important;font-size:13px !important;min-height:40px}
  .signin-card>div:nth-child(2){min-width:0 !important;flex:1 1 60%}
  #signin-banner{padding:0 12px !important;margin:12px auto 20px !important}

  /* 详情页 */
  .book-hero{padding:24px 0 22px}
  .bh-cover .cover{width:118px;height:164px;border-radius:5px 11px 11px 5px}
  .bh-crumb{font-size:12px;margin-bottom:10px}
  .bh-info h1{font-size:21px}
  .bh-meta{gap:10px;font-size:12.5px;margin-bottom:12px}
  .bh-desc{font-size:13px;line-height:1.75;margin-bottom:16px}
  .bh-acts{gap:9px}
  .bh-acts .btn{padding:11px 18px;font-size:13.5px;min-height:44px;border-radius:9px}
  .btn{min-height:44px}

  /* 卷 Tab */
  .vol-tabs{gap:6px;padding-bottom:6px;margin:0 0 6px}
  .vol-tab{padding:8px 14px;font-size:12.5px}

  /* 阅读器 */
  .reader-top .wrap{height:48px;padding:0 10px;gap:10px}
  .reader-top button{font-size:12.5px;padding:6px 8px}
  .rt-title{font-size:12.5px}
  .reader-wrap{padding:0 0 24px}
  .reader-title{font-size:21px;margin:16px 0 4px;line-height:1.4}
  .reader-sub{font-size:11.5px;margin-bottom:6px}
  .reader-bar{top:48px;padding:8px 10px;gap:8px}
  .reader-bar .rbtn{padding:7px 11px;font-size:12.5px;min-height:34px}
  .reader-bar .progress{font-size:11.5px}
  .doc{padding:18px 14px;font-size:15.5px;line-height:1.95;border-radius:10px}
  .doc h1.doc-h1,.doc h2.doc-h1{font-size:20px;margin:26px 0 12px;padding-bottom:9px}
  .doc h2.doc-h2{font-size:17px;margin:22px 0 10px}
  .doc h3.doc-h3{font-size:15.5px;margin:18px 0 8px}
  .doc p.doc-p{margin:10px 0}
  .doc ul.doc-ul,.doc ol.doc-ol{margin:10px 0 10px 20px}
  .doc code.doc-code{font-size:.9em}
  .doc pre.doc-pre{font-size:12.5px;padding:13px 14px;border-radius:9px;margin:13px 0}
  .doc blockquote.doc-quote{padding:9px 14px;margin:12px 0}
  .chap-pager{margin-top:22px;gap:8px}
  .chap-pager a{padding:12px 10px;font-size:13px;min-height:44px;display:flex;align-items:center;justify-content:center}
  .toc-drawer .panel{padding:16px 14px}
  .toc-drawer .panel h4{font-size:15px}
  .toc-link{padding:10px 8px;font-size:14px}

  /* 上传页 */
  .up-hero{padding:28px 0}
  .up-hero h1{font-size:22px}
  .up-hero p{font-size:13px;line-height:1.7;padding:0 16px}
  .dropzone{margin:24px auto 0;padding:30px 16px;border-radius:16px}
  .dropzone .dz-ic{font-size:38px;margin-bottom:10px}
  .dropzone .dz-t{font-size:15px}
  .dropzone .dz-s{font-size:12px;padding:0 8px}
  .uploaded .file{padding:12px 14px}
  .up-steps{margin:24px auto 0;padding:0 14px}
  .up-steps h3{font-size:15.5px}
  .up-steps li{font-size:13px}
  .up-status{font-size:13px;padding:12px 14px}

  /* 底部 Tab 微调 */
  .mtab{height:56px}
  .mtab a .mi{font-size:19px}
  .mtab a{font-size:10px}

  /* 页脚 */
  .footer{padding:30px 0 76px;margin-top:44px}
  .footer .wrap{padding:0 16px}
  .footer .fbrand{font-size:16px}
  .footer .cols{gap:28px}
  .footer small{font-size:11px}
}

/* ---- 超小屏（≤360px）再压缩 ---- */
@media (max-width:360px){
  .nav .brand{font-size:13.5px}
  .feat-info h1{font-size:22px !important}
  .stats .stat{min-width:50%}
  .grid{gap:10px}
  .card .name{font-size:13px}
  .bh-acts .btn{padding:10px 14px;font-size:13px}
}

/* =====================================================================
   v3 视觉升级（2026-08-19）— 现代高级感设计系统
   保持书店质感，升级为：动态光效 / 玻璃拟态 / 精致动效 / 层次阴影
   ===================================================================== */
:root{
  --gold-soft:#e8cf96;
  --gold-grad:linear-gradient(135deg,#e6c87e 0%,#c9a35c 45%,#a98545 100%);
  --deep-grad:linear-gradient(160deg,#163f4d 0%,#0d2a34 55%,#0a212a 100%);
  --shadow-lg:0 24px 60px rgba(10,33,42,.22),0 6px 18px rgba(10,33,42,.10);
  --r-lg:20px;
  --ease:cubic-bezier(.22,.61,.36,1);
}
::selection{background:rgba(201,163,92,.35);color:#123440}
*{scrollbar-width:thin;scrollbar-color:rgba(201,163,92,.5) transparent}
::-webkit-scrollbar{width:8px;height:8px}
::-webkit-scrollbar-thumb{background:linear-gradient(180deg,#c9a35c,#a98545);border-radius:8px}
::-webkit-scrollbar-track{background:transparent}

/* ---------- 导航：毛玻璃 + 金色光边 ---------- */
.nav{background:linear-gradient(180deg,rgba(13,42,52,.96),rgba(10,33,42,.96));backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px)}
.nav::after{content:"";position:absolute;left:0;right:0;bottom:0;height:1px;background:linear-gradient(90deg,transparent,rgba(201,163,92,.55),transparent)}
.nav .wrap{height:62px}
.brand .logo{box-shadow:inset 0 -2px 0 rgba(0,0,0,.18),0 4px 12px rgba(201,163,92,.35);transition:transform .3s var(--ease)}
.brand:hover .logo{transform:rotate(-6deg) scale(1.06)}
.nav .btn-up{border-color:rgba(201,163,92,.75);box-shadow:0 0 0 rgba(201,163,92,0);transition:.25s var(--ease)}
.nav .btn-up:hover{box-shadow:0 4px 18px rgba(201,163,92,.4)}

/* ---------- Hero：动态光效 ---------- */
.hero{position:relative;overflow:hidden;background:var(--deep-grad)}
.hero::before{content:"";position:absolute;width:560px;height:560px;border-radius:50%;top:-200px;right:-120px;
  background:radial-gradient(circle,rgba(201,163,92,.22),transparent 62%);
  animation:heroGlow 7s ease-in-out infinite alternate;pointer-events:none}
.hero::after{content:"";position:absolute;width:420px;height:420px;border-radius:50%;bottom:-180px;left:-100px;
  background:radial-gradient(circle,rgba(41,128,155,.20),transparent 62%);
  animation:heroGlow 9s ease-in-out infinite alternate-reverse;pointer-events:none}
@keyframes heroGlow{from{transform:translate3d(0,0,0) scale(1);opacity:.85}to{transform:translate3d(24px,18px,0) scale(1.12);opacity:1}}
.hero .featured{position:relative;z-index:1}
.feat-info h1{background:linear-gradient(180deg,#fffdf6 10%,#f3dfb2 60%,#d9b36a 100%);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.feat-info h1 .accent{background:var(--gold-grad);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;filter:drop-shadow(0 2px 10px rgba(201,163,92,.35))}
.feat-info .kicker{letter-spacing:8px;background:var(--gold-grad);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.feat-info .sub{color:#c9d6d0}
.feat-info .pill{border-color:rgba(201,163,92,.55);background:rgba(201,163,92,.12);box-shadow:0 0 20px rgba(201,163,92,.15) inset}
.feat-cover .cover{transition:transform .6s var(--ease),box-shadow .6s var(--ease)}
.feat-cover:hover .cover{transform:perspective(900px) rotateY(-8deg) translateY(-6px)}
.stat .num{background:var(--gold-grad);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}

/* ---------- 书籍卡片：高级感 + 入场动画 ---------- */
.grid{perspective:1200px}
.card{background:#fff;border:1px solid rgba(231,226,216,.8);box-shadow:0 6px 18px rgba(10,33,42,.06);transition:transform .35s var(--ease),box-shadow .35s var(--ease),border-color .35s}
.card:hover{transform:translateY(-8px);box-shadow:var(--shadow-lg);border-color:rgba(201,163,92,.45)}
.card .cov img{transition:transform .5s var(--ease),filter .5s var(--ease)}
.card:hover .cov img{transform:scale(1.07);filter:saturate(1.08)}
.card .cov::after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,transparent 55%,rgba(10,33,42,.28));pointer-events:none;opacity:0;transition:opacity .35s}
.card:hover .cov::after{opacity:1}
.card .tag{box-shadow:0 4px 12px rgba(18,52,64,.3)}
.card .name{transition:color .25s}
.card:hover .name{color:#a07a35}
.card .go .ic{transition:transform .3s var(--ease)}
.card:hover .go .ic{transform:translateX(6px)}
/* 入场动画（交错淡入） */
.card{animation:cardIn .5s var(--ease) both}
.card:nth-child(3n+2){animation-delay:.06s}
.card:nth-child(3n){animation-delay:.12s}
@keyframes cardIn{from{opacity:0;transform:translateY(16px) scale(.98)}to{opacity:1;transform:none}}

/* ---------- 畅销榜：金渐变数字 ---------- */
.rank{background:linear-gradient(180deg,#fff,#fdfbf6);border:1px solid rgba(231,226,216,.6)}
.rank li{transition:background .25s,padding .25s}
.rank li:hover{background:linear-gradient(90deg,rgba(201,163,92,.09),transparent)}
.rank .rn{background:var(--gold-grad);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;filter:drop-shadow(0 2px 6px rgba(201,163,92,.3))}
.rank li:nth-child(1) .rn{background:linear-gradient(135deg,#ffd700,#e8a33d,#c0392b);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.rank .rcover{transition:transform .35s var(--ease),box-shadow .35s var(--ease)}
.rank li:hover .rcover{transform:translateY(-2px) rotate(-2deg);box-shadow:0 8px 18px rgba(10,33,42,.22)}

/* ---------- 分类浏览：悬浮动效 ---------- */
.cat-cell{position:relative;overflow:hidden;transition:transform .3s var(--ease),box-shadow .3s,border-color .3s;border:1px solid transparent}
.cat-cell:hover{transform:translateY(-5px);box-shadow:0 14px 30px rgba(10,33,42,.12);border-color:rgba(201,163,92,.5)}
.cat-cell .ic{transition:transform .35s var(--ease)}
.cat-cell:hover .ic{transform:scale(1.15) rotate(-6deg)}
.cat-cell::after{content:"";position:absolute;top:0;left:-80%;width:60%;height:100%;background:linear-gradient(105deg,transparent,rgba(255,255,255,.75),transparent);transform:skewX(-20deg);transition:left .5s var(--ease);pointer-events:none}
.cat-cell:hover::after{left:130%}

/* ---------- 工具栏：搜索聚焦光环 ---------- */
.search input{box-shadow:0 2px 10px rgba(10,33,42,.05)}
.search input:focus{box-shadow:0 0 0 4px rgba(201,163,92,.18),0 6px 20px rgba(201,163,92,.15);border-color:var(--gold);transform:translateY(-1px)}
.search input{transition:box-shadow .3s,border-color .3s,transform .3s}
.chip{transition:all .25s var(--ease)}
.chip:hover{transform:translateY(-2px);box-shadow:0 4px 12px rgba(201,163,92,.2)}

/* ---------- 板块标题 ---------- */
.section-head h2{letter-spacing:2px}
.section-head h2::before{background:var(--gold-grad);box-shadow:0 2px 8px rgba(201,163,92,.45)}

/* ---------- 详情页 ---------- */
.book-hero{position:relative;background:linear-gradient(150deg,#fdfbf6,#f3ecd9 60%,#ece2c8)}
.book-hero .bh-cover .cover{transition:transform .5s var(--ease),box-shadow .5s}
.book-hero .bh-cover:hover .cover{transform:translateY(-6px) rotate(-1.5deg);box-shadow:22px 26px 54px rgba(18,52,64,.32),5px 0 0 rgba(0,0,0,.18)}
.btn-primary{box-shadow:0 8px 22px rgba(201,163,92,.4),0 2px 6px rgba(201,163,92,.3);transition:.25s var(--ease)}
.btn-primary:hover{transform:translateY(-3px);box-shadow:0 14px 30px rgba(201,163,92,.5)}
.btn:active{transform:translateY(0) scale(.97)}
.bh-cat{box-shadow:0 4px 10px rgba(201,163,92,.2)}
.bh-stat{transition:transform .3s var(--ease),box-shadow .3s}
.bh-stat:hover{transform:translateY(-3px);box-shadow:0 8px 20px rgba(10,33,42,.1)}
.vol-tab{transition:all .25s var(--ease)}
.vol-tab:not(.active):hover{transform:translateY(-2px);box-shadow:0 6px 14px rgba(10,33,42,.08)}

/* ---------- 阅读器 ---------- */
.reader-top{background:linear-gradient(180deg,#0d2a34,#123440);box-shadow:0 2px 16px rgba(0,0,0,.3)}
.reader-top button{transition:background .2s,transform .2s}
.reader-top button:hover{background:rgba(201,163,92,.22);transform:translateY(-1px)}
.doc{border:1px solid rgba(231,226,216,.7);box-shadow:0 10px 30px rgba(10,33,42,.07)}
.doc h1.doc-h1,.doc h2.doc-h1{border-bottom:2px solid var(--gold-grad);background:linear-gradient(180deg,#123440,#163f4d);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.doc blockquote.doc-quote{border-left:4px solid var(--gold);background:linear-gradient(90deg,var(--gold-bg),#faf6ec)}
.chap-pager a{transition:all .25s var(--ease)}
.chap-pager a:hover:not(.disabled){transform:translateY(-2px);border-color:var(--gold);box-shadow:0 8px 20px rgba(201,163,92,.18)}

/* ---------- 签到横幅 ---------- */
.signin-card{animation:cardIn .45s var(--ease) both}

/* ---------- 后台 ---------- */
.ad-top{background:var(--deep-grad);box-shadow:0 12px 30px rgba(10,33,42,.18)}
.ad-top h1 .avatar{box-shadow:0 4px 14px rgba(201,163,92,.35)}
.ad-tab{transition:all .2s var(--ease)}
.ad-tab:hover{transform:translateY(-1px)}
.ad-stat{transition:transform .3s var(--ease),box-shadow .3s}
.ad-stat:hover{transform:translateY(-3px);box-shadow:0 10px 24px rgba(10,33,42,.1)}
.ad-stat .n{background:var(--gold-grad);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}

/* ---------- 登录/注册 ---------- */
.lg-card,.reg-card{box-shadow:0 24px 70px rgba(10,33,42,.18),0 4px 14px rgba(10,33,42,.08);animation:cardIn .5s var(--ease) both}
.lg-head,.reg-head{background:var(--deep-grad)}

/* ---------- 动效降级 ---------- */
@media (prefers-reduced-motion: reduce){
  *,*::before,*::after{animation:none !important;transition:none !important}
}

/* ---------- 移动端（≤480px）视觉细化 ---------- */
@media (max-width:480px){
  .hero::before{width:340px;height:340px;top:-140px;right:-90px}
  .hero::after{width:280px;height:280px;bottom:-120px;left:-80px}
  .feat-info .kicker{letter-spacing:5px}
  .grid{perspective:none}
  .card{animation:cardIn .4s var(--ease) both}
  .card:nth-child(3n+2),.card:nth-child(3n){animation-delay:0s}
  .rank li:hover{background:none}
  .cat-cell::after{display:none}
}

/* =====================================================================
   v3.1 头像下拉菜单 + paywall 二维码
   ===================================================================== */
.nav-user-dd{position:relative;display:inline-block}
.nav-user-trigger{display:inline-flex;align-items:center;gap:6px;background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.18);border-radius:999px;padding:3px 10px 3px 4px;color:#f3dfb2;cursor:pointer;font-family:inherit;font-size:13px;transition:.25s var(--ease)}
.nav-user-trigger:hover{background:rgba(201,163,92,.2);border-color:rgba(201,163,92,.5);transform:translateY(-1px);box-shadow:0 4px 14px rgba(201,163,92,.25)}
.nav-user-trigger .caret{font-size:10px;opacity:.7;margin-left:1px;transition:transform .25s var(--ease)}
.nav-user-dd.open .caret{transform:rotate(-180deg)}
.nav-user-menu{position:absolute;top:calc(100% + 10px);right:0;min-width:220px;background:linear-gradient(180deg,rgba(18,52,64,.97),rgba(10,33,42,.97));backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);border:1px solid rgba(201,163,92,.35);border-radius:14px;padding:8px;box-shadow:0 18px 48px rgba(0,0,0,.4);z-index:120;animation:menuIn .22s var(--ease)}
.nav-user-menu[hidden]{display:none}
@keyframes menuIn{from{opacity:0;transform:translateY(-8px) scale(.98)}to{opacity:1;transform:none}}
.um-info{display:flex;align-items:center;gap:10px;padding:10px 12px;border-radius:10px;background:rgba(255,255,255,.05);margin-bottom:6px;border:1px solid rgba(255,255,255,.06)}
.um-info .um-avatar{width:38px;height:38px;font-size:22px;display:flex;align-items:center;justify-content:center;border-radius:50%;background:linear-gradient(135deg,#f3e9d3,#d9b36a);box-shadow:0 4px 10px rgba(201,163,92,.3);flex:none}
.um-info .um-meta b{color:#f3dfb2;display:block;font-size:13.5px;font-weight:600;line-height:1.3}
.um-info .um-meta small{color:#9fb0a6;font-size:11px;display:block;margin-top:2px}
.um-item{display:flex;align-items:center;gap:8px;padding:10px 12px;border-radius:8px;font-size:13px;color:#f3dfb2;background:transparent;border:0;width:100%;text-align:left;cursor:pointer;font-family:inherit;text-decoration:none;transition:background .15s,color .15s,transform .15s}
.um-item:hover{background:rgba(201,163,92,.18);color:#fff;transform:translateX(2px)}
.um-item.danger{color:#f3a3a3}
.um-item.danger:hover{background:rgba(176,58,46,.28)}

/* paywall 二维码 */
.pay-qr-list .pay-qr-item{display:flex;flex-direction:column;align-items:center;gap:6px}
.pay-qr-list .pay-qr-item img{width:180px;height:auto;border:2px solid #c9a35c;border-radius:12px;background:#fff;box-shadow:0 6px 18px rgba(201,163,92,.25)}
.pay-qr-list .pay-qr-cap{font-size:13px;color:#7a4f10;font-weight:700}
.pay-amt{transition:all .2s var(--ease)}
.pay-amt:hover{transform:translateY(-2px);box-shadow:0 8px 18px rgba(201,163,92,.3);background:linear-gradient(135deg,#fff7e6,#f3e9d3) !important}
.pay-amt.selected{background:linear-gradient(135deg,#c9a35c,#a07a35) !important;color:#fff !important;border-color:transparent !important}
.pay-note{transition:border-color .2s,box-shadow .2s}
.pay-note:focus{border-color:var(--gold,#c9a35c);box-shadow:0 0 0 3px rgba(201,163,92,.15)}
.pay-gid{display:none}

/* 移动端下拉菜单适配 */
@media (max-width:480px){
  .nav-user-trigger{padding:2px 8px 2px 3px;font-size:12.5px}
  .nav-user-trigger .nav-user-name{max-width:72px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
  .nav-user-menu{min-width:200px;right:-6px}
}

/* =====================================================================
   v3.2 头像清晰度优化 + 随机推荐适配
   ===================================================================== */
.nav-user-trigger .nav-avatar{border-radius:50%;
  background:linear-gradient(135deg,#f3e9d3,#e0c48a);border:1.5px solid rgba(255,255,255,.4);
  box-shadow:0 2px 8px rgba(201,163,92,.45);flex:none;vertical-align:middle}
.nav-user-trigger .nav-avatar:hover{transform:scale(1.08)}
@media (max-width:480px){
  .nav-user-trigger{gap:5px}
}

/* =====================================================================
   v3.3 微信浏览器适配：触发器移动端隐藏名字，避开地址栏"···"覆盖
   ===================================================================== */
@media (max-width:480px){
  /* 触发器只显示头像+小三角，省出右侧空间不被微信"···"按钮遮挡 */
  .nav-user-trigger .nav-user-name{display:none}
  .nav-user-trigger{padding-right:8px;padding-left:3px;gap:0}
  /* 导航整体右侧留白，让地址栏"···"按钮盖到空白 */
  .nav .wrap{padding-right:60px}
}

/* =====================================================================
   v4 桌面版专属设计（≥1200px 宽屏）— 更大气、更精致
   ===================================================================== */
@media (min-width:1200px){
  /* 全局：背景氛围 */
  body{background:#f6f2ea}
  .wrap{max-width:1320px;padding:0 32px}

  /* 导航：更高更精致 */
  .nav .wrap{height:68px;gap:30px}
  .nav .brand{font-size:21px;letter-spacing:1.5px}
  .brand .logo{width:38px;height:38px;font-size:21px;border-radius:9px}
  .nav .cats a{padding:7px 14px;font-size:14.5px}
  .nav .btn-up{padding:8px 18px;font-size:14px}

  /* Hero：大封面 + 双栏大气布局 */
  .hero{padding:72px 0 10px}
  .hero .featured{grid-template-columns:380px 1fr;gap:72px;padding-bottom:64px}
  .feat-cover .cover{width:380px;border-radius:8px 20px 20px 8px}
  .feat-cover .badge{font-size:14px;padding:9px 18px;top:-16px;left:-16px}
  .feat-info .kicker{font-size:14px;letter-spacing:10px;margin-bottom:14px}
  .feat-info h1{font-size:54px;line-height:1.2}
  .feat-info .sub{font-size:17px;max-width:680px;margin:16px 0 24px}
  .feat-info .pill{font-size:14.5px;padding:8px 18px;margin-bottom:26px}
  .stats{max-width:680px;padding-top:26px}
  .stat .num{font-size:36px}
  .stat .lbl{font-size:13px;letter-spacing:1.5px}

  /* 板块间距 */
  .section{padding:52px 0 10px}
  .section-head{margin-bottom:26px}
  .section-head h2{font-size:30px;padding-left:20px}
  .section-head h2::before{width:6px}

  /* 畅销榜：桌面双列，更多信息 */
  .rank{padding:26px 30px;border-radius:18px}
  .rank ol{display:grid;grid-template-columns:1fr 1fr;column-gap:44px}
  .rank li{padding:13px 8px;border-bottom:1px dashed var(--line)}
  .rank li:nth-child(7),.rank li:nth-child(8){border-bottom:0}
  .rank .rn{font-size:26px;width:38px}
  .rank .rcover{width:50px;border-radius:5px}
  .rank li .rname{font-size:15.5px}
  .rank li .rname small{font-size:13px}

  /* 分类浏览：大图标格子 */
  .cat-grid{grid-template-columns:repeat(6,1fr);gap:22px}
  .cat-cell{padding:26px 14px;border-radius:18px}
  .cat-cell .ic{width:58px;height:58px;font-size:28px;border-radius:16px;margin-bottom:14px}
  .cat-cell .nm{font-size:16px}
  .cat-cell .ct{font-size:13px}

  /* 书籍卡片：更大气 */
  .grid{gap:34px 28px}
  .card{border-radius:16px}
  .card .info{padding:14px 16px 16px}
  .card .name{font-size:16px}
  .card .meta{font-size:12.5px}
  .card .go{font-size:13px;padding-top:9px}
  .card .tag{font-size:12px;padding:4px 12px;top:12px;left:12px}
  .card .vol{font-size:11.5px;padding:4px 9px;top:12px;right:12px}

  /* 工具栏：大搜索框 */
  .toolbar{padding:20px 0}
  .search{max-width:640px;margin-bottom:16px}
  .search input{padding:14px 18px 14px 48px;font-size:15.5px}
  .chip{padding:7px 18px;font-size:13.5px}

  /* 详情页 */
  .book-hero{padding:56px 0 52px}
  .book-hero .wrap{grid-template-columns:300px 1fr;gap:56px}
  .bh-cover .cover{width:300px}
  .bh-info h1{font-size:40px}
  .bh-desc{font-size:16px;max-width:780px}
  .btn{padding:13px 30px;font-size:15.5px}
  .bh-stat .n{font-size:24px}
  .bh-stat{padding:14px 26px}

  /* 阅读器：正文居中 + 侧栏目录 */
  .reader-wrap{grid-template-columns:300px 1fr;gap:40px;max-width:1200px;padding:16px 32px 70px}
  .side-toc{top:140px;max-height:calc(100vh - 170px);padding:18px 16px}
  .side-toc h4{font-size:16px}
  .side-toc .toc-link{font-size:14px;padding:8px 12px}
  .doc{padding:52px 60px;font-size:16.5px;line-height:2.05}
  .doc h1.doc-h1,.doc h2.doc-h1{font-size:30px;margin:38px 0 18px}
  .doc h2.doc-h2{font-size:23px}
  .doc h3.doc-h3{font-size:19px}

  /* 上传页 */
  .dropzone{padding:70px 40px}
  .dropzone .dz-ic{font-size:56px}
  .dropzone .dz-t{font-size:20px}

  /* 页脚 */
  .footer{padding:48px 0}
  .footer .fbrand{font-size:20px}
  .footer .cols{gap:80px}
  .footer a{font-size:14px}
}

/* =====================================================================
   v5 TTS 朗读声音设置面板（男声/女声 + 语速 + 音调）
   ===================================================================== */
.tts-panel{position:absolute;right:0;top:calc(100% + 8px);width:280px;z-index:130;
  background:linear-gradient(180deg,rgba(18,52,64,.98),rgba(10,33,42,.98));backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);
  border:1px solid rgba(201,163,92,.4);border-radius:14px;padding:12px;
  box-shadow:0 18px 48px rgba(0,0,0,.45);animation:menuIn .22s var(--ease)}
.tts-panel[hidden]{display:none}
.tts-p-head{font-size:14px;font-weight:700;color:#f3dfb2;margin-bottom:8px;letter-spacing:1px}
.tts-p-sec{margin-bottom:8px}
.tts-p-lbl{font-size:12px;color:#9fb0a6;margin-bottom:5px;display:flex;justify-content:space-between}
.tts-p-lbl b{color:#f3dfb2;font-weight:600}
.tts-p-row{display:flex;gap:6px;flex-wrap:wrap}
.tts-chip{padding:6px 11px;font-size:12.5px;border-radius:999px;border:1px solid rgba(201,163,92,.45);
  background:rgba(255,255,255,.05);color:#d9cdb5;cursor:pointer;font-family:inherit;transition:all .18s var(--ease);white-space:nowrap}
.tts-chip:hover{border-color:var(--gold,#c9a35c);color:#fff;transform:translateY(-1px)}
.tts-chip.on{background:linear-gradient(135deg,#c9a35c,#a07a35);border-color:transparent;color:#fff;font-weight:700;
  box-shadow:0 4px 12px rgba(201,163,92,.35)}
.tts-p-cur{font-size:11.5px;color:#8fa299;border-top:1px dashed rgba(201,163,92,.3);padding-top:8px;margin-top:4px}
.tts-p-cur span{color:#f3dfb2}
.reader-bar{position:relative}
@media (max-width:560px){
  .tts-panel{width:258px;right:0;position:fixed;top:auto;bottom:74px;left:50%;transform:translateX(-50%);
    box-shadow:0 18px 54px rgba(0,0,0,.55)}
}