/* ===== 火龙果文库 公共样式（浅色文库风） ===== */
:root{
  --bg:#f5f6f8; --card:#fff; --line:#e8eaee; --line2:#f0f1f4;
  --t:#333; --m:#666; --d:#999;
  --red:#f04438; --red-d:#d92d20;
  --c-pdf:#ef4444; --c-word:#3b82f6; --c-excel:#10b981; --c-ppt:#f59e0b; --c-wps:#8b5cf6; --c-other:#94a3b8;
}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;background:var(--bg);color:var(--t);-webkit-font-smoothing:antialiased;font-size:14px}
a{text-decoration:none;color:inherit}
img{border:none}
.wrap{max-width:1200px;margin:0 auto;padding:0 20px}
em{font-style:normal;color:var(--red)}

/* ===== 顶部导航 ===== */
.nav{position:fixed;top:0;left:0;right:0;z-index:100;height:56px;background:rgba(255,255,255,.9);backdrop-filter:saturate(160%) blur(16px);-webkit-backdrop-filter:saturate(160%) blur(16px);border-bottom:1px solid var(--line)}
.nav-in{max-width:1200px;margin:0 auto;padding:0 20px;height:100%;display:flex;align-items:center;gap:22px}
.logo{display:flex;align-items:center;gap:9px;flex-shrink:0}
.logo-badge{width:30px;height:30px;border-radius:8px;background:var(--red);display:flex;align-items:center;justify-content:center;flex-shrink:0}
.logo-badge svg{width:17px;height:17px;fill:#fff}
.logo-name{font-size:17px;font-weight:800;color:var(--t);letter-spacing:.5px;white-space:nowrap}
.logo-name small{display:block;font-size:8px;font-weight:600;color:var(--red);letter-spacing:1.6px;text-transform:uppercase;line-height:1}
.nav-links{display:flex;align-items:center;gap:4px;flex-shrink:0}
.nav-links a{font-size:13px;color:var(--m);padding:6px 12px;border-radius:8px;transition:all .15s;white-space:nowrap}
.nav-links a:hover{color:var(--t);background:var(--line2)}
.nav-links a.on{color:var(--red);font-weight:650}
.nav-search{flex:1;max-width:420px;position:relative;margin-left:auto}
.nav-search input{width:100%;height:34px;padding:0 38px 0 14px;border:1px solid var(--line);border-radius:999px;background:#f7f8fa;font-size:13px;color:var(--t);outline:none;transition:border .15s}
.nav-search input:focus{border-color:var(--red);background:#fff}
.nav-search button{position:absolute;right:4px;top:4px;width:26px;height:26px;border:none;background:none;cursor:pointer;color:var(--d);display:flex;align-items:center;justify-content:center}
.nav-search button:hover{color:var(--red)}
.nav-search svg{width:15px;height:15px}
.nav-portal{font-size:12px;color:var(--m);white-space:nowrap;flex-shrink:0;padding:6px 10px;border-radius:8px;transition:all .15s}
.nav-portal:hover{color:var(--red);background:#fef3f2}
.page-body{padding-top:56px;min-height:calc(100vh - 56px)}

/* ===== 首页 Hero ===== */
.hero{background:linear-gradient(160deg,#eef4ff 0%,#f6f9ff 45%,#fff5f4 100%);border-bottom:1px solid var(--line);padding:64px 0 52px;text-align:center}
.hero h1{font-size:clamp(24px,4vw,38px);font-weight:900;letter-spacing:1px}
.hero h1 .hl{color:var(--red)}
.hero p{margin-top:10px;font-size:14px;color:var(--m)}
.big-search{max-width:560px;margin:26px auto 0;display:flex;background:#fff;border:1px solid var(--line);border-radius:999px;overflow:hidden;box-shadow:0 6px 24px rgba(30,50,90,.07);transition:border .15s}
.big-search:focus-within{border-color:var(--red)}
.big-search input{flex:1;border:none;outline:none;padding:13px 22px;font-size:14px;color:var(--t);background:none}
.big-search button{border:none;background:var(--red);color:#fff;font-size:14px;font-weight:650;padding:0 30px;cursor:pointer;transition:background .15s}
.big-search button:hover{background:var(--red-d)}
.hot-words{margin-top:14px;font-size:12px;color:var(--d);display:flex;justify-content:center;gap:8px;flex-wrap:wrap}
.hot-words a{color:var(--m);padding:3px 12px;background:rgba(255,255,255,.7);border:1px solid var(--line);border-radius:999px;transition:all .15s}
.hot-words a:hover{color:var(--red);border-color:#f5c6c2;background:#fff}

/* ===== 区块标题 ===== */
.section{padding:34px 0 8px}
.sec-head{display:flex;align-items:baseline;justify-content:space-between;margin-bottom:16px}
.sec-t{font-size:18px;font-weight:800;display:flex;align-items:center;gap:9px}
.sec-t::before{content:'';width:4px;height:17px;border-radius:2px;background:var(--red)}
.sec-more{font-size:12px;color:var(--d)}
.sec-more:hover{color:var(--red)}

/* ===== 推荐封面卡片 ===== */
.rec-grid{display:grid;grid-template-columns:repeat(6,1fr);gap:16px}
.rec-card{background:var(--card);border:1px solid var(--line);border-radius:12px;overflow:hidden;transition:all .2s;display:block}
.rec-card:hover{transform:translateY(-3px);box-shadow:0 10px 26px rgba(30,50,90,.1);border-color:#ddd}
.rec-thumb{position:relative;height:150px;background:#f1f5f9;overflow:hidden;display:flex;align-items:center;justify-content:center}
.rec-thumb img{width:100%;height:100%;object-fit:cover}
.rec-badge{position:absolute;top:7px;right:7px;padding:2px 7px;border-radius:6px;font-size:9px;font-weight:700;color:#fff;text-transform:uppercase;pointer-events:none}
.rec-title{padding:9px 11px 3px;font-size:12.5px;font-weight:600;color:var(--t);line-height:1.45;height:39px;overflow:hidden;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical}
.rec-meta{padding:0 11px 10px;font-size:11px;color:var(--d)}

/* 缩略图占位（无图时） */
.thumb-fb{width:100%;height:100%;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:6px;color:#fff;font-weight:800}
.thumb-fb .fb-fmt{font-size:22px;letter-spacing:1px}
.thumb-fb .fb-txt{font-size:10px;font-weight:500;opacity:.85}

/* ===== 分类卡片 ===== */
.cat-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(215px,1fr));gap:14px}
.cat-card{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:18px;display:flex;align-items:center;gap:13px;transition:all .2s}
.cat-card:hover{transform:translateY(-2px);box-shadow:0 8px 22px rgba(30,50,90,.09);border-color:#f0b8b3}
.cat-ic{width:42px;height:42px;border-radius:10px;background:#fef3f2;color:var(--red);display:flex;align-items:center;justify-content:center;flex-shrink:0}
.cat-ic svg{width:21px;height:21px}
.cat-cn{font-size:14.5px;font-weight:700}
.cat-cm{font-size:11.5px;color:var(--d);margin-top:2px}

/* ===== 各分类最新 ===== */
.latest-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.latest-box{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:16px 20px}
.latest-head{display:flex;align-items:center;justify-content:space-between;padding-bottom:10px;border-bottom:1px solid var(--line2);margin-bottom:6px}
.latest-head .ln{font-size:15px;font-weight:750}
.latest-head a{font-size:12px;color:var(--d)}
.latest-head a:hover{color:var(--red)}
.latest-box ul{list-style:none}
.latest-box li{display:flex;align-items:center;gap:8px;padding:7px 0;font-size:13px;border-bottom:1px dashed var(--line2)}
.latest-box li:last-child{border-bottom:none}
.latest-box li a{flex:1;min-width:0;color:var(--m);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.latest-box li a:hover{color:var(--red)}
.latest-box li .ld{font-size:11px;color:var(--d);flex-shrink:0}

/* ===== 面包屑 ===== */
.crumb{background:var(--card);border-bottom:1px solid var(--line);padding:12px 0;font-size:13px;color:var(--m)}
.crumb a{color:var(--m)}
.crumb a:hover{color:var(--red)}
.crumb .sep{margin:0 8px;color:var(--d)}
.crumb .cur{color:var(--t);font-weight:600}

/* ===== 列表页布局 ===== */
.layout{display:flex;gap:20px;padding:22px 0 50px;align-items:flex-start}
.side{width:210px;flex-shrink:0;display:flex;flex-direction:column;gap:16px}
.side-box{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:14px 8px}
.side-t{font-size:14px;font-weight:750;padding:0 12px 10px;border-bottom:1px solid var(--line2);margin-bottom:6px}
.side-box ul{list-style:none}
.side-box li a{display:flex;align-items:center;justify-content:space-between;padding:8px 12px;font-size:13px;color:var(--m);border-radius:8px;transition:all .15s}
.side-box li a:hover{color:var(--red);background:#fef7f6}
.side-box li.on a{color:var(--red);background:#fef3f2;font-weight:650}
.side-box li a .cnt{font-size:11px;color:var(--d)}
.main-col{flex:1;min-width:0;background:var(--card);border:1px solid var(--line);border-radius:12px;overflow:hidden}

/* 排序 tabs */
.sort-tabs{display:flex;align-items:center;gap:2px;padding:0 18px;border-bottom:1px solid var(--line)}
.sort-tabs a{padding:13px 14px 11px;font-size:13.5px;color:var(--m);border-bottom:2px solid transparent;transition:all .15s}
.sort-tabs a:hover{color:var(--t)}
.sort-tabs a.on{color:var(--red);font-weight:650;border-bottom-color:var(--red)}
.total-line{padding:11px 20px;font-size:12.5px;color:var(--d);border-bottom:1px solid var(--line2)}

/* 文档行 */
.doc-row{display:flex;gap:16px;padding:16px 20px;border-bottom:1px solid var(--line2);transition:background .15s}
.doc-row:hover{background:#fafbfc}
.doc-row:last-child{border-bottom:none}
.doc-thumb{width:112px;height:140px;flex-shrink:0;border:1px solid var(--line);border-radius:8px;overflow:hidden;background:#f1f5f9;display:block}
.doc-thumb img{width:100%;height:100%;object-fit:cover}
.doc-info{flex:1;min-width:0;display:flex;flex-direction:column}
.doc-t{display:flex;align-items:center;gap:8px;min-width:0}
.doc-t a{font-size:15px;font-weight:650;color:#1d7fd8;line-height:1.4;overflow:hidden;text-overflow:ellipsis;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical}
.doc-t a:hover{color:var(--red);text-decoration:underline}
.doc-meta{margin-top:auto;padding-top:10px;font-size:12px;color:var(--d);display:flex;align-items:center;gap:8px;flex-wrap:wrap}
.doc-meta .dot{color:#ddd}
.empty-box{padding:60px 20px;text-align:center;color:var(--d);font-size:13px}

/* 格式小图标 */
.chip{display:inline-flex;align-items:center;justify-content:center;min-width:20px;height:20px;padding:0 5px;border-radius:5px;font-size:9.5px;font-weight:800;color:#fff;text-transform:uppercase;flex-shrink:0;letter-spacing:.3px}
.chip.big{height:30px;min-width:30px;padding:0 9px;font-size:12px;border-radius:7px}

/* ===== 分页 ===== */
.pager{display:flex;justify-content:center;align-items:center;gap:6px;padding:22px 16px;flex-wrap:wrap}
.pager a,.pager span{min-width:32px;height:32px;padding:0 9px;display:inline-flex;align-items:center;justify-content:center;border:1px solid var(--line);border-radius:8px;font-size:13px;color:var(--m);background:#fff;transition:all .15s}
.pager a:hover{border-color:var(--red);color:var(--red)}
.pager .cur{background:var(--red);border-color:var(--red);color:#fff;font-weight:650}
.pager .dis{color:#ccc;background:#fafafa;pointer-events:none}

/* ===== 详情页 ===== */
.doc-layout{display:flex;gap:20px;padding:22px 0 90px;align-items:flex-start}
.doc-main{flex:1;min-width:0;background:var(--card);border:1px solid var(--line);border-radius:12px;padding:24px 26px}
.doc-head{display:flex;align-items:flex-start;gap:12px}
.doc-head h1{font-size:20px;font-weight:800;line-height:1.45;word-break:break-all}
.doc-meta2{margin-top:12px;padding-bottom:16px;border-bottom:1px solid var(--line2);font-size:12.5px;color:var(--d);display:flex;gap:8px;flex-wrap:wrap}
.doc-side{width:270px;flex-shrink:0}
.rel-list{list-style:none}
.rel-list li a{display:flex;align-items:center;gap:9px;padding:9px 12px;font-size:13px;color:var(--m);border-radius:8px;transition:all .15s}
.rel-list li a:hover{color:var(--red);background:#fef7f6}
.rel-list li a .rt{flex:1;min-width:0;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}

/* 预览区 */
.preview-box{margin-top:18px;border:1px solid var(--line);border-radius:10px;background:#525659;min-height:420px;display:flex;align-items:center;justify-content:center;overflow:hidden;position:relative}
.preview-box:fullscreen{border-radius:0}
.preview-box iframe{width:100%;height:78vh;min-height:560px;border:none;background:#525659}
.preview-box img.pv-img{max-width:100%;max-height:80vh;display:block;margin:0 auto}
.pv-loading,.pv-fail,.pv-none{display:flex;flex-direction:column;align-items:center;gap:14px;color:#e5e7eb;padding:60px 20px;text-align:center}
.pv-loading .spin{width:30px;height:30px;border:3px solid rgba(255,255,255,.25);border-top-color:#fff;border-radius:50%;animation:spin 1s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}
.pv-fail .pf-t,.pv-none .pf-t{font-size:15px;font-weight:650}
.pv-fail .pf-d,.pv-none .pf-d{font-size:12.5px;color:#b9bec5}

/* 底部工具栏 */
.toolbar{position:fixed;left:0;right:0;bottom:0;z-index:90;background:rgba(255,255,255,.92);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);border-top:1px solid var(--line);box-shadow:0 -4px 20px rgba(30,50,90,.06)}
.toolbar-in{max-width:1200px;margin:0 auto;padding:10px 20px;display:flex;align-items:center;justify-content:center;gap:12px}
.tb-btn{display:inline-flex;align-items:center;gap:6px;padding:9px 18px;border-radius:10px;border:1px solid var(--line);background:#fff;font-size:13px;color:var(--m);cursor:pointer;transition:all .15s}
.tb-btn:hover{color:var(--red);border-color:#f0b8b3}
.tb-dl{display:inline-flex;align-items:center;gap:7px;padding:10px 26px;border-radius:10px;background:var(--red);color:#fff;font-size:13.5px;font-weight:700;transition:all .15s;box-shadow:0 4px 14px rgba(240,68,56,.25)}
.tb-dl:hover{background:var(--red-d);transform:translateY(-1px)}
.tb-btn svg,.tb-dl svg{width:15px;height:15px}

/* ===== 搜索页 ===== */
.search-head{background:var(--card);border-bottom:1px solid var(--line);padding:26px 0 22px}
.search-head .big-search{margin:0;max-width:640px}
.search-result-box{margin:22px 0 50px;background:var(--card);border:1px solid var(--line);border-radius:12px;overflow:hidden}

/* ===== 页脚 ===== */
.footer{border-top:1px solid var(--line);background:var(--card);padding:26px 0;text-align:center;font-size:12px;color:var(--d)}
.footer .f-links{margin-bottom:8px;display:flex;justify-content:center;gap:18px}
.footer .f-links a{color:var(--m)}
.footer .f-links a:hover{color:var(--red)}

/* ===== 响应式 ===== */
@media (max-width:1000px){
  .rec-grid{grid-template-columns:repeat(4,1fr)}
  .latest-grid{grid-template-columns:1fr}
}
@media (max-width:900px){
  .layout,.doc-layout{flex-direction:column}
  .side,.doc-side{width:100%}
  .nav-links{display:none}
  .nav-portal{display:none}
}
@media (max-width:640px){
  .rec-grid{grid-template-columns:repeat(2,1fr)}
  .doc-thumb{width:88px;height:112px}
  .nav-search{max-width:none}
  .logo-name small{display:none}
  .doc-main{padding:18px 16px}
  .toolbar-in{gap:8px}
  .tb-dl{padding:10px 16px}
}