:root{
  --bg:#f7f3ee; --card:#ffffff; --border:#e8dfd6; --fg:#2c3e50; --dim:#7a6f63;
  --accent:#8b6b4f; --accent2:#b68b6b; --ink:#1e2a3a; --amber:#b07a12;
  --amber-bg:#fff7e6; --green:#2f855a; --red:#c53030; --paper:#ffffff;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{background:var(--bg);color:var(--fg);font-family:"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;line-height:1.7}
a{color:inherit;text-decoration:none}
img{max-width:100%}
.wrap{max-width:1080px;margin:0 auto;padding:0 20px}

header{background:#fff;border-bottom:1px solid var(--border);position:sticky;top:0;z-index:30}
.header-in{display:flex;align-items:center;gap:16px;padding:12px 20px;max-width:1080px;margin:0 auto}
.brand{display:flex;align-items:center;gap:9px;font-size:19px;font-weight:800;color:var(--accent)}
.brand img{width:30px;height:30px;border-radius:8px}
.nav{margin-left:auto;display:flex;gap:16px;font-size:14px;color:var(--dim)}
.nav a:hover{color:var(--accent)}
nav a.on{color:var(--accent);font-weight:600}

.hero{text-align:center;padding:44px 20px 28px;background:linear-gradient(180deg,#fdfaf7,var(--bg))}
.hero h1{font-size:2.6rem;font-weight:800;letter-spacing:2px;color:var(--ink)}
.hero h1 em{font-style:normal;background:linear-gradient(145deg,#b68b6b,#8b6b4f);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.hero .sub{color:var(--dim);letter-spacing:3px;margin-top:8px;font-weight:300}
.hero .stats{display:flex;gap:26px;justify-content:center;margin-top:18px;flex-wrap:wrap}
.hero .stats b{font-size:1.5rem;color:var(--accent);display:block}
.hero .stats span{font-size:12px;color:var(--dim)}

.section{padding:10px 0 8px}
.section-title{font-size:1.4rem;font-weight:700;border-left:6px solid var(--accent2);padding-left:14px;margin:22px 0 16px;color:var(--ink)}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:18px}
.grid.wide{grid-template-columns:repeat(auto-fill,minmax(300px,1fr))}
.card{background:var(--card);border:1px solid var(--border);border-radius:14px;overflow:hidden;transition:transform .12s,box-shadow .12s;display:flex;flex-direction:column}
.card.hover:hover{transform:translateY(-3px);box-shadow:0 8px 24px rgba(60,40,20,.08)}
.cover-wrap{position:relative;aspect-ratio:3/4;background:#f1ece6;overflow:hidden}
.cover-wrap img{width:100%;height:100%;object-fit:cover;display:block}
.c-body{padding:12px 14px 14px;display:flex;flex-direction:column;flex:1}
.c-title{font-size:14px;font-weight:600;line-height:1.45;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;min-height:40px}
.c-meta{font-size:12px;color:var(--dim);margin-top:5px}
.badge{display:inline-block;font-size:11px;padding:2px 9px;border-radius:30px;margin-right:6px}
.badge.lit{background:#eef2ff;color:#2f6fed}
.badge.tech{background:#e6f7ec;color:#2f855a}
.badge.scan{background:#fff3e0;color:#b07a12}
.badge.free{background:#e6f7ec;color:#2f855a}
.badge.paid{background:#ffe9e9;color:#c53030}
.badge-dot{display:inline-block;width:6px;height:6px;border-radius:50%;background:var(--accent2);margin-right:5px;vertical-align:middle}

.pager{display:flex;gap:8px;justify-content:center;margin:26px 0 10px;flex-wrap:wrap}
.pager button,.pager a{min-width:38px;padding:8px 13px;border:1px solid var(--border);border-radius:8px;background:#fff;color:var(--dim);cursor:pointer;font-size:14px}
.pager .cur{background:var(--accent);border-color:var(--accent);color:#fff}
.pager :disabled{opacity:.4;cursor:not-allowed}
.empty{text-align:center;color:var(--dim);padding:50px 0;font-size:15px}

/* ---- 单篇 ---- */
.page-card{background:var(--card);border:1px solid var(--border);border-radius:18px;padding:30px 34px;margin:26px 0 10px;box-shadow:0 6px 22px rgba(60,40,20,.05)}
@media (max-width:640px){.page-card{padding:18px 16px}}
.arthead{display:flex;gap:22px;margin:24px 0}
.arthead .cov{width:170px;flex:none;border-radius:12px;overflow:hidden;box-shadow:0 6px 20px rgba(60,40,20,.15);background:#f1ece6}
.arthead .cov img{width:100%;display:block}
.arthead h1{font-size:24px;color:var(--ink);font-weight:800;line-height:1.4}
.arthead .meta{color:var(--dim);font-size:13px;margin-top:8px}
.chips{display:flex;gap:8px;flex-wrap:wrap;margin-top:12px}
.chip{font-size:12px;color:var(--dim);border:1px solid var(--border);padding:3px 11px;border-radius:999px;background:#fbf8f4}
.tabs{display:flex;gap:6px;border-bottom:1px solid var(--border);margin:20px 0 0;overflow-x:auto}
.tab{background:none;border:none;border-bottom:3px solid transparent;padding:9px 16px;font-size:14px;color:var(--dim);cursor:pointer;white-space:nowrap}
.tab.on{color:var(--accent);border-bottom-color:var(--accent);font-weight:600}
.panel{display:none;padding:18px 2px 30px;margin-top:6px}
.panel.on{display:block}
.panel h4{font-size:14px;color:var(--dim);margin:18px 0 8px}
.panel h4:first-child{margin-top:0}
.rv{font-size:14.5px;line-height:1.95;color:#3d4459;white-space:pre-wrap}
.speedview{background:#f4ede8;border-left:6px solid var(--accent2);border-radius:0 12px 12px 0;padding:16px 20px;margin-bottom:18px}
.speedview .sv-t{font-size:12px;color:var(--accent);font-weight:700;letter-spacing:2px;margin-bottom:6px}
.case{border-left:3px solid var(--accent);background:#fbf8f4;border-radius:0 10px 10px 0;padding:10px 14px;margin:8px 0;font-size:13.5px}
.cdim{color:var(--dim);font-size:12px}
.rv-meta{margin-top:16px;padding-top:10px;border-top:1px dashed var(--border);color:var(--dim);font-size:12px}
.g-h{font-size:13.5px;color:var(--accent);margin:18px 0 6px;font-weight:700}
.g-accept{font-size:13px;color:var(--amber);background:var(--amber-bg);border-radius:8px;padding:8px 12px;margin:6px 0}
ul.plain{list-style:none;padding-left:2px}
ul.plain li{padding:4px 0;font-size:13.5px;color:#3d4459}
.faq-item{margin:10px 0;border:1px solid var(--border);border-radius:10px;overflow:hidden}
.faq-item .q{background:#fbf8f4;padding:10px 14px;font-weight:600;color:var(--ink);font-size:14px;cursor:pointer}
.faq-item .a{padding:10px 14px;font-size:13.5px;color:#3d4459;display:none}
.faq-item.open .a{display:block}

/* ---- 课程播放 ---- */
.course-shell{display:grid;grid-template-columns:280px 1fr;gap:22px;margin:20px 0}
.course-side{background:#fff;border:1px solid var(--border);border-radius:14px;padding:14px;max-height:78vh;overflow:auto;position:sticky;top:74px}
.course-side h4{font-size:13px;color:var(--dim);margin:12px 0 6px}
.course-side .mod{padding:8px 10px;border-radius:8px;margin:3px 0;cursor:pointer;font-size:13px;color:var(--fg)}
.course-side .mod.cur{background:#f4ede8;color:var(--accent);font-weight:600}
.course-side .mod.done::after{content:"✓";float:right;color:var(--green)}
.course-side .less{font-size:12.5px;padding:4px 0 4px 22px;color:var(--dim);cursor:pointer}
.course-side .less.cur{color:var(--accent);font-weight:600}
.course-side .less.done{color:var(--green)}
.lesson-card{background:#fff;border:1px solid var(--border);border-radius:14px;padding:22px 26px}
.lesson-card h2{font-size:20px;color:var(--ink);margin-bottom:10px}
.lesson-card .obj{background:var(--amber-bg);color:var(--amber);border-radius:8px;padding:8px 14px;font-size:13px;margin:6px 0 16px}
.lock-overlay{text-align:center;padding:50px 30px;background:#fff;border:1px solid var(--border);border-radius:14px}
.lock-overlay h3{margin-bottom:10px}
.qz{background:#fbf8f4;border:1px solid var(--border);border-radius:10px;padding:12px 16px;margin:10px 0}
.qz .opt{display:block;padding:6px 10px;margin:4px 0;border:1px solid var(--border);border-radius:8px;background:#fff;cursor:pointer;font-size:13px}
.qz .opt.correct{background:#e6f7ec;border-color:var(--green);color:var(--green)}
.qz .opt.wrong{background:#ffe9e9;border-color:var(--red);color:var(--red)}
.qz .expl{display:none;font-size:12.5px;color:var(--dim);margin-top:6px}
.qz .opt.correct ~ .expl,.qz .opt.wrong ~ .expl{display:block}
.navbtns{display:flex;gap:10px;margin-top:18px}
.btn{padding:9px 20px;border-radius:9px;border:1px solid var(--border);background:#fff;color:var(--fg);cursor:pointer;font-size:14px}
.btn.primary{background:var(--accent);border-color:var(--accent);color:#fff}
.btn:hover{opacity:.92}
.progress{height:6px;background:#ece4da;border-radius:99px;overflow:hidden;margin:8px 0}
.progress>i{display:block;height:100%;background:var(--green);width:0;transition:width .3s}

/* ---- 后台 ---- */
.admin-layout{display:grid;grid-template-columns:200px 1fr;gap:24px;margin:22px 0}
.admin-nav{background:#fff;border:1px solid var(--border);border-radius:14px;padding:12px;align-self:start;position:sticky;top:74px}
.admin-nav a{display:block;padding:9px 12px;border-radius:8px;font-size:13.5px;color:var(--dim)}
.admin-nav a.on,.admin-nav a:hover{background:#f4ede8;color:var(--accent)}
.admin-box{background:#fff;border:1px solid var(--border);border-radius:14px;padding:18px 20px;margin-bottom:16px}
table.tbl{width:100%;border-collapse:collapse;font-size:13px}
table.tbl th,table.tbl td{text-align:left;padding:8px 10px;border-bottom:1px solid var(--border)}
table.tbl th{color:var(--dim);font-weight:600;font-size:12px}
form.flds label{display:block;font-size:12.5px;color:var(--dim);margin:10px 0 4px}
form.flds input,form.flds textarea,form.flds select{width:100%;padding:9px 12px;border:1px solid var(--border);border-radius:8px;font-size:13.5px;background:#fff;color:var(--fg)}
form.flds textarea{min-height:90px;font-family:inherit}
.row2{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.msg{position:fixed;top:14px;right:14px;z-index:99;padding:11px 18px;border-radius:10px;color:#fff;font-size:13.5px;opacity:0;transition:opacity .2s;background:var(--green);box-shadow:0 6px 18px rgba(0,0,0,.15)}
.msg.err{background:var(--red)}
.msg.show{opacity:1}

footer{border-top:1px solid var(--border);margin-top:40px;padding:22px 20px 40px;text-align:center;color:var(--dim);font-size:12.5px}

@media (max-width:760px){
  .hero h1{font-size:2rem}
  .arthead{flex-direction:column}
  .arthead .cov{width:130px}
  .course-shell{grid-template-columns:1fr}
  .course-side{position:static;max-height:none}
  .admin-layout{grid-template-columns:1fr}
  .row2{grid-template-columns:1fr}
}

/* ---- 后台 shell ---- */
.admin-shell{display:grid;grid-template-columns:200px 1fr;gap:22px;max-width:1160px;margin:22px auto 0;padding:0 20px}
.admin-shell .admin-nav{position:sticky;top:74px}
.admin-shell .admin-nav b{display:block;padding:6px 12px 14px;font-size:14px;color:var(--ink)}
.admin-main{min-width:0;padding-bottom:40px}
.admin-main input:not([type=checkbox]),.admin-main select,.admin-main textarea{
  border:1px solid var(--border);border-radius:8px;padding:8px 12px;font-size:13.5px;background:#fff;color:var(--fg);font-family:inherit}
.admin-main label{font-size:12.5px;color:var(--dim);display:block;margin:12px 0 4px}
.sec-head{display:flex;align-items:center;gap:10px;justify-content:space-between;margin:14px 0 10px;font-size:16px;font-weight:700;color:var(--ink);flex-wrap:wrap}
.admin-main .row{display:flex;gap:8px;align-items:center;background:#fff;border:1px solid var(--border);border-radius:10px;padding:9px 12px;margin:6px 0;font-size:13px;flex-wrap:wrap}
.admin-main .row .st{width:92px}
.admin-main .row .st.err,span.err{color:var(--red)}
span.st{color:var(--green);font-weight:600}
.admin-main .btn.small{padding:5px 11px;font-size:12px;border-radius:7px}
.admin-main .btn.warn{color:var(--red)}
.cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:12px;margin-bottom:16px}
.stat{background:#fff;border:1px solid var(--border);border-radius:12px;padding:16px;text-align:center}
.stat b{display:block;font-size:1.6rem;color:var(--accent)}
.stat span{font-size:12px;color:var(--dim)}
.stat small{color:var(--amber);font-size:11px}
.genbox{display:flex;gap:8px;align-items:center;background:#fff;border:1px dashed var(--border);border-radius:10px;padding:12px;margin-bottom:12px;flex-wrap:wrap}
.genbox input,.genbox select{flex:0 1 auto}
.set-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:8px 18px;background:#fff;border:1px solid var(--border);border-radius:12px;padding:16px 18px}
.set-grid label{margin-top:6px}
.login{max-width:320px;margin:9vh auto 0;background:#fff;border:1px solid var(--border);border-radius:14px;padding:28px 26px;display:flex;flex-direction:column;gap:12px}
.login h1{font-size:20px;color:var(--ink)}
.login input{padding:10px 13px;border:1px solid var(--border);border-radius:9px;font-size:14px}
.lesson-body h3{margin:18px 0 6px;font-size:17px;color:var(--ink)}
.lesson-body p,.lesson-body li{margin-bottom:8px}
.lesson-body blockquote{border-left:4px solid var(--accent2);background:#f4ede8;padding:10px 14px;border-radius:0 10px 10px 0;margin:12px 0;color:#3d4459}
.lesson-body pre{background:#f4f1ec;border:1px solid var(--border);border-radius:10px;padding:12px 14px;overflow-x:auto;font-size:13px}
.lesson-body table{width:100%;border-collapse:collapse;margin:12px 0;font-size:13.5px}
.lesson-body th,.lesson-body td{border:1px solid var(--border);padding:7px 10px;text-align:left}
.lesson-body th{background:#fbf8f4}
@media (max-width:760px){.admin-shell{grid-template-columns:1fr}}

/* 单页编辑器（文本框 + 工具栏） */
.pg-editor{display:flex;flex-direction:column;gap:12px;width:100%}
.pg-fields{display:flex;gap:14px;flex-wrap:wrap}
.pg-field{display:flex;flex-direction:column;gap:4px;flex:1;min-width:200px}
.pg-field label{font-size:12px;color:var(--dim)}
.pg-field input,.pg-field select{padding:8px 10px;border:1px solid var(--border);border-radius:8px;font-size:13.5px}
.pg-field input:focus,.pg-field select:focus,.pg-ta:focus{outline:none;border-color:var(--accent)}
.pg-tool{background:#fff;border:1px solid var(--border);border-radius:10px;padding:10px 12px;display:flex;flex-direction:column;gap:8px}
.pg-tip{font-size:12px;color:var(--dim);line-height:1.6}
.pg-btns{display:flex;flex-wrap:wrap;gap:6px;align-items:center}
.pg-btns .tb{background:#fff;border:1px solid var(--border);border-radius:6px;padding:5px 10px;font-size:12.5px;cursor:pointer;color:var(--ink);line-height:1.4}
.pg-btns .tb:hover{background:var(--accent);color:#fff;border-color:var(--accent)}
.pg-btns .tb.sep{background:none;border:none;color:var(--border);cursor:default;padding:0 2px}
.pg-btns .tb.sep:hover{background:none;color:var(--border)}
.pg-btns .tb.acc{background:var(--accent);color:#fff;border-color:var(--accent);font-weight:600}
.pg-btns .tb.acc:hover{background:var(--accent2)}
.pg-ta{width:100%;height:500px;border:1px solid var(--border);border-radius:10px;padding:14px 16px;font-family:ui-monospace,Menlo,Consolas,monospace;font-size:13px;line-height:1.7;resize:vertical;box-sizing:border-box}
.pg-ta:focus{border-color:var(--accent)}
.pg-actions{display:flex;gap:8px}

/* 可视化/源码双模式切换 */
.pg-modebar{display:flex;align-items:center;gap:10px;justify-content:space-between;flex-wrap:wrap}
.pg-mode{display:flex;gap:6px;align-items:center}
.pg-mode .pg-mode-btn{background:#fff;border:1px solid var(--border);border-radius:16px;padding:4px 14px;font-size:12.5px;cursor:pointer;color:var(--dim)}
.pg-mode .pg-mode-btn:hover{border-color:var(--accent);color:var(--ink)}
.pg-mode .pg-mode-btn.on{background:var(--accent);color:#fff;border-color:var(--accent);font-weight:600}
.pg-vis{min-height:500px;border:1px solid var(--border);border-radius:10px;padding:14px 16px;font-size:15px;line-height:1.9;background:#fff;outline:none;overflow:auto;box-sizing:border-box}
.pg-vis:focus{border-color:var(--accent)}
.pg-vis img{max-width:100%;border-radius:8px}
.pg-vis table{border-collapse:collapse;width:100%}
.pg-vis table td{border:1px solid #ccc;padding:6px}
.pg-vis blockquote{border-left:4px solid var(--accent2);background:#f4ede8;padding:10px 14px;border-radius:0 10px 10px 0;margin:12px 0;color:#3d4459}
.pg-vis pre{background:#f4f1ec;border:1px solid var(--border);border-radius:10px;padding:12px 14px;overflow-x:auto;font-size:13px}
.pg-vis iframe{max-width:100%;border:0;border-radius:8px;width:100%;height:400px}

/* ---- 课程编辑器：章节 / 集数 ---- */
.ce-main{display:flex;gap:14px;align-items:flex-start;margin-top:14px}
.ce-tree{width:280px;flex:none;background:#fff;border:1px solid var(--border);border-radius:12px;padding:10px 12px;max-height:80vh;overflow:auto;box-sizing:border-box}
.ce-tree-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:8px}
.ce-mod{margin:10px 0;padding:8px;background:#fbf8f4;border:1px solid var(--border);border-radius:10px}
.ce-mod-head{display:flex;gap:4px;align-items:center}
.ce-mod-head input{flex:1;min-width:0;padding:4px 6px;border:1px solid var(--border);border-radius:6px;font-size:13px;font-weight:600}
.ce-less-list{margin:8px 0 4px}
.ce-less{display:flex;gap:6px;align-items:center;padding:6px 8px;border-radius:8px;font-size:13px;color:var(--dim);cursor:pointer}
.ce-less:hover{background:#fff;color:var(--accent)}
.ce-less.on{background:var(--accent);color:#fff;font-weight:600}
.ce-less span:first-child{font-size:11px;opacity:.7}
.ce-less .tb{margin-left:auto;font-size:11px;line-height:1;padding:2px 6px}
.ce-less.on .tb{color:#fff}
video[data-hls]{background:#000}
@media (max-width:760px){.ce-main{flex-direction:column}.ce-tree{width:100%;max-height:none}}

/* 网页资源搜索弹窗（插入图片/视频/声音） */
.mm-overlay{position:fixed;inset:0;background:rgba(20,20,20,.45);z-index:200;display:flex;align-items:flex-start;justify-content:center;padding:40px 16px}
.mm-box{background:#fff;border-radius:12px;max-width:880px;width:100%;padding:16px 18px;box-shadow:0 12px 40px rgba(0,0,0,.25);display:flex;flex-direction:column;max-height:86vh}
.mm-box b{flex:1;font-size:15px}
.mm-search{display:flex;gap:8px;margin-top:10px}
.mm-search input{flex:1;padding:8px 10px;border:1px solid var(--border);border-radius:8px;font-size:13.5px}
.mm-plat{display:flex;gap:6px;margin-top:8px;flex-wrap:wrap}
.mm-plat .mp{background:#fff;border:1px solid var(--border);border-radius:16px;padding:3px 12px;font-size:12px;color:var(--dim);cursor:pointer}
.mm-plat .mp.on{background:var(--accent);color:#fff;border-color:var(--accent);font-weight:600}
.mm-meta{font-size:11.5px;color:var(--dim);margin-top:10px}
.mm-link{color:var(--accent);cursor:pointer;font-size:13px;white-space:nowrap}
.mm-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(160px,1fr));gap:10px;overflow:auto;padding:4px;margin-top:12px;flex:1}
.mm-item{cursor:pointer;border:1px solid var(--border);border-radius:10px;overflow:hidden;background:#fff;display:flex;flex-direction:column}
.mm-item img{width:100%;height:96px;object-fit:cover;background:#eee}
.mm-item .tt{font-size:12px;color:var(--ink);padding:6px 8px;line-height:1.4}
.mm-item:hover{border-color:var(--accent)}