/* 课程网页样式。色值与字体从 render/theme.py 注入（见 :root 变量，由 web_build 在页面里写入）。 */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;scroll-padding-top:84px}
body{font-family:var(--sans);color:var(--ink);background:#f7f3ea;line-height:1.8;font-size:17px;-webkit-font-smoothing:antialiased}
a{color:inherit}
.wrap{max-width:1180px;margin:0 auto;padding:0 24px}

/* 顶栏 */
.top{position:sticky;top:0;z-index:50;background:rgba(15,30,53,.97);backdrop-filter:blur(10px);border-bottom:1px solid rgba(201,168,76,.18)}
.top .wrap{display:flex;align-items:center;justify-content:space-between;height:60px;gap:16px}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:#fff;font-family:var(--serif);font-weight:700;letter-spacing:.05em}
.brand i{display:inline-flex;width:32px;height:32px;border:2px solid var(--gold);border-radius:50%;align-items:center;justify-content:center;color:var(--gold);font-style:normal;font-size:18px}
.brand small{display:block;font-family:var(--sans);font-weight:300;font-size:11px;color:var(--gold);letter-spacing:.15em;margin-top:-4px}
.top nav{display:flex;align-items:center;gap:6px}
.top nav a,.btn-login{color:rgba(245,240,232,.85);text-decoration:none;font-size:15px;padding:8px 14px;border-radius:6px;border:0;background:none;cursor:pointer;font-family:inherit}
.top nav a:hover,.btn-login:hover{color:var(--gold_lt)}
.btn-login{background:var(--gold);color:var(--navy)!important;font-weight:500}
.btn-login:hover{background:var(--gold_lt)}
.who{font-size:14px;color:var(--gold_lt);padding:0 6px}

/* 封面 */
.hero{background:radial-gradient(900px 480px at 90% -20%,rgba(201,168,76,.2),transparent 60%),linear-gradient(160deg,#0f1e35,#0b1729);color:var(--cream);padding:64px 0 56px;position:relative;overflow:hidden}
.hero::after{content:"";position:absolute;right:-160px;bottom:-240px;width:620px;height:620px;border:2px solid rgba(201,168,76,.13);border-radius:50%}
.hero .grid{display:grid;grid-template-columns:1.25fr 1fr;gap:48px;align-items:center;position:relative;z-index:1}
.kicker{color:var(--gold);letter-spacing:.2em;font-size:14px}
.hero h1{font-family:var(--serif);font-size:clamp(34px,5.4vw,60px);line-height:1.25;color:#fff;margin:10px 0 4px}
.hero h1 + p{font-family:var(--serif);font-size:clamp(20px,2.6vw,28px);color:var(--gold_lt);margin-bottom:22px}
.chips{display:flex;flex-wrap:wrap;gap:10px;margin-bottom:26px}
.chip{border:1px solid rgba(201,168,76,.55);color:var(--gold_lt);border-radius:30px;padding:3px 16px;font-size:14px}
.chip.free{background:var(--gold);color:var(--navy);border-color:var(--gold);font-weight:600}
.hero .lead{max-width:34em;color:rgba(245,240,232,.88);margin-bottom:26px}
.cta-row{display:flex;gap:12px;flex-wrap:wrap}
.btn{display:inline-block;padding:11px 24px;border-radius:8px;text-decoration:none;font-weight:500;font-size:16px;cursor:pointer;border:1px solid transparent;font-family:inherit}
.btn.gold{background:var(--gold);color:var(--navy)}.btn.gold:hover{background:var(--gold_lt)}
.btn.ghost{border-color:rgba(245,240,232,.4);color:var(--cream)}.btn.ghost:hover{border-color:var(--gold_lt);color:var(--gold_lt)}
.btn.dark{background:var(--navy);color:#fff}.btn.dark:hover{background:var(--navy3)}
.takeaway-box{background:rgba(255,255,255,.07);border:1px solid rgba(255,255,255,.12);border-radius:18px;padding:26px 28px}
.takeaway-box h3{font-family:var(--serif);color:var(--gold_lt);font-size:20px;margin-bottom:12px}
.takeaway-box li{list-style:none;padding-left:26px;position:relative;margin-bottom:10px;color:rgba(245,240,232,.92);font-size:16px;line-height:1.6}
.takeaway-box li::before{content:"✓";position:absolute;left:0;color:var(--gold);font-weight:700}

/* 版心：目录 + 正文 */
.layout{display:grid;grid-template-columns:230px minmax(0,1fr);gap:40px;padding:40px 0 80px}
.toc{position:sticky;top:84px;align-self:start;font-size:15px}
.toc h4{font-size:13px;letter-spacing:.16em;color:var(--gray);font-weight:500;margin-bottom:10px}
.toc a{display:flex;gap:10px;align-items:baseline;text-decoration:none;color:#44506a;padding:7px 10px;border-left:3px solid transparent;border-radius:0 8px 8px 0}
.toc a span{color:var(--gold);font-family:var(--serif);font-weight:700;font-size:14px}
.toc a:hover{background:#fff}
.toc a.on{border-left-color:var(--gold);background:#fff;color:var(--ink);font-weight:500}
.toc .prog{height:5px;border-radius:3px;background:#e6dfce;margin:16px 10px 4px;overflow:hidden}
.toc .prog b{display:block;height:100%;width:0;background:var(--gold);transition:width .25s}
.toc .pl{font-size:12px;color:var(--gray);padding:0 10px}

section.chapter{margin-bottom:56px}
.ch-head{display:flex;align-items:baseline;gap:14px;margin-bottom:22px;flex-wrap:wrap}
.ch-num{font-family:var(--serif);font-weight:700;font-size:44px;color:var(--gold);line-height:1}
.ch-head h2{font-family:var(--serif);font-size:30px;color:var(--navy);line-height:1.3;position:relative}
.ch-head h2::after{content:"";display:block;height:6px;margin-top:4px;background:no-repeat center/100% 100% url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 300 10' preserveAspectRatio='none'%3E%3Cpath d='M2 6 C 60 1, 120 9, 180 4 S 260 7 298 3' fill='none' stroke='%23d64545' stroke-width='3' stroke-linecap='round'/%3E%3C/svg%3E")}
.ch-min{margin-left:auto;font-size:14px;color:var(--gray);border:1px solid #d9d0bb;border-radius:30px;padding:1px 14px}
.block{margin-bottom:28px}
.block>h3{font-family:var(--serif);font-size:22px;color:var(--navy);margin-bottom:14px}
.tag{display:inline-block;font-size:13px;color:#8a6d1e;background:#f3e6bd;border-radius:6px;padding:1px 10px;margin-left:10px;font-family:var(--sans);font-weight:400;vertical-align:middle}
.card{background:#fff;border-radius:18px;padding:24px 28px;box-shadow:0 1px 2px rgba(15,30,53,.05),0 8px 24px -12px rgba(15,30,53,.14);border:1px solid #efe8d6}
.callout{background:#fbf3d9;border-left:6px solid var(--gold);border-radius:0 14px 14px 0;padding:14px 22px;margin-top:16px;color:#5b4a14;font-size:16.5px}
.callout.red{background:#fdeeee;border-color:var(--red);color:#7c2a2a}

.story-card{background:linear-gradient(135deg,#fff,#fbf6e7);border-radius:20px;padding:28px 34px;border:1px solid #efe3bf;position:relative}
.story-card .who{color:#8a6d1e;font-weight:600;margin-bottom:10px}
.story-card p{font-size:18.5px;margin-bottom:8px}

.compare{display:grid;grid-template-columns:1fr 1fr;gap:20px}
.col{background:#fff;border-radius:18px;padding:24px 26px;border:2px solid #ece4cf}
.col.good{border-color:#8fcbaa;background:#f3fbf6}.col.bad{border-color:#eaa9a9;background:#fff6f6}
.col h4{font-family:var(--serif);font-size:20px;margin-bottom:10px;color:var(--navy)}
.col .big{font-family:var(--serif);font-size:54px;color:#b28a1f;line-height:1.1;margin:2px 0 8px}
.col ul{list-style:none}.col li{position:relative;padding-left:22px;margin-bottom:8px}.col li::before{content:"";position:absolute;left:2px;top:12px;width:9px;height:9px;border-radius:50%;background:var(--gold)}
.res{margin-top:12px;font-weight:600;color:#2d5a43;background:rgba(63,155,111,.12);border-radius:10px;padding:8px 14px;font-size:16px}
.col.bad .res{color:#7c2a2a;background:rgba(214,69,69,.1)}
.col.neutral .res{color:var(--navy);background:#f1ecdc}

.codewrap{position:relative;margin:10px 0}
pre.code{font-family:var(--mono);font-size:14.5px;line-height:1.75;background:#0f1e35;color:#f3ead2;border-radius:12px;padding:18px 78px 18px 20px;white-space:pre-wrap;word-break:break-word;overflow:auto}
pre.code mark{background:rgba(201,168,76,.28);color:var(--gold_lt);border-radius:4px;padding:0 3px}
.copy{position:absolute;right:10px;top:10px;background:rgba(201,168,76,.18);border:1px solid rgba(201,168,76,.5);color:var(--gold_lt);font-size:13px;border-radius:6px;padding:3px 12px;cursor:pointer;font-family:inherit}
.copy:hover{background:var(--gold);color:var(--navy)}.copy.ok{background:var(--green);border-color:var(--green);color:#fff}

.steps{display:grid;gap:12px}
.step{display:flex;gap:18px;align-items:flex-start;background:#fff;border:1px solid #efe8d6;border-radius:16px;padding:16px 22px}
.step .n{flex:none;width:38px;height:38px;border-radius:50%;background:var(--gold);color:var(--navy);font-weight:700;display:flex;align-items:center;justify-content:center;margin-top:2px}
.step b{display:block;font-size:18px;color:var(--navy)}.step span{color:#4b5568;font-size:16px}
.cards{display:grid;gap:18px}
.cards.c2{grid-template-columns:repeat(2,1fr)}.cards.c3{grid-template-columns:repeat(3,1fr)}.cards.c4{grid-template-columns:repeat(2,1fr)}
.cards .card h4{font-family:var(--serif);font-size:21px;color:#9a7618;margin-bottom:8px}
.cards .card p{font-size:16.5px;color:#3d4863}

.flow{display:flex;gap:0;align-items:stretch;flex-wrap:wrap}
.node{flex:1;min-width:170px;background:#fff;border:2px solid var(--gold);border-radius:16px;padding:16px 16px;text-align:center}
.node b{display:block;font-family:var(--serif);font-size:19px;color:var(--navy);margin-bottom:6px}.node span{font-size:15px;color:#4b5568;line-height:1.55;display:block}
.arr{flex:none;width:36px;display:flex;align-items:center;justify-content:center;color:var(--gold);font-size:28px}

.chat-demo{background:#fff;border-radius:20px;border:1px solid #efe8d6;padding:22px}
.chat-tools{display:flex;gap:10px;align-items:center;margin-bottom:14px;flex-wrap:wrap}
.chat-tools .hint{color:var(--gray);font-size:14px}
.panels{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}
.panel{background:#f4f0e4;border-radius:14px;padding:14px;min-height:230px;opacity:.25;filter:grayscale(.6);transition:.35s}
.panel.on{opacity:1;filter:none}
.panel .pt{text-align:center;color:#8a6d1e;font-size:14px;letter-spacing:.1em;margin-bottom:10px}
.bub{padding:10px 14px;border-radius:16px;margin:8px 0;font-size:15px;line-height:1.6;max-width:96%;white-space:pre-wrap}
.bub.me{background:var(--gold);color:var(--navy);margin-left:auto;border-bottom-right-radius:4px}
.bub.ai{background:#fff;border:1px solid #e6dfce;border-bottom-left-radius:4px}

.checklist{display:grid;gap:10px}
.check{display:flex;gap:14px;align-items:flex-start;background:#fff;border:1px solid #efe8d6;border-radius:14px;padding:12px 18px;cursor:pointer;transition:.15s}
.check:hover{border-color:var(--gold)}
.check input{width:22px;height:22px;accent-color:var(--gold);margin-top:5px;flex:none}
.check.done{background:#f3fbf6;border-color:#8fcbaa}.check.done span{color:#4b6b58;text-decoration:line-through;text-decoration-color:rgba(214,69,69,.6)}

.exercise{background:#fff;border:1px solid #efe8d6;border-radius:22px;padding:28px 30px;box-shadow:0 8px 24px -14px rgba(15,30,53,.18)}
.ex-head{display:flex;align-items:center;gap:14px;flex-wrap:wrap;margin-bottom:12px}
.ex-badge{background:var(--navy);color:var(--gold_lt);font-family:var(--serif);font-weight:700;border-radius:10px;padding:2px 14px}
.ex-head h3{font-family:var(--serif);font-size:23px;color:var(--navy)}
.ex-head .min{margin-left:auto;color:var(--gray);font-size:14px}
.plabel{font-size:14px;color:#8a6d1e;font-weight:600;margin:14px 0 2px}
details.mat{margin:14px 0;border:1px dashed #cdbf95;border-radius:12px;background:#fdfaf0}
details.mat summary{cursor:pointer;padding:10px 16px;font-weight:600;color:#7a5f13}
details.mat pre{font-family:var(--sans);font-size:15px;line-height:1.75;white-space:pre-wrap;padding:6px 18px 16px;color:#33405a}
.two{display:grid;grid-template-columns:1fr 1fr;gap:22px;margin-top:16px}
.two h5{font-size:15px;color:var(--navy);margin-bottom:8px;letter-spacing:.04em}
.two ul{list-style:none}.two li{padding-left:22px;position:relative;margin-bottom:8px;font-size:15.5px;line-height:1.65}
.two li::before{content:"✓";position:absolute;left:0;color:var(--green);font-weight:700}
.pit{background:#fff7f0;border-radius:12px;padding:10px 14px;margin-bottom:10px;font-size:15px;line-height:1.6}
.pit b{color:#9a4b1b}.pit i{display:block;font-style:normal;color:#2d5a43}
.personal{margin-top:14px;font-size:14.5px;color:#5b667c;border-top:1px dashed #e0d6bd;padding-top:12px}

.quiz-q{background:#fff;border:1px solid #efe8d6;border-radius:18px;padding:22px 26px;margin-bottom:16px}
.quiz-q h4{font-family:var(--serif);font-size:19px;margin-bottom:12px;color:var(--navy)}
.opt{display:flex;gap:14px;width:100%;text-align:left;font:inherit;background:#faf7ee;border:2px solid #e9e1cc;border-radius:12px;padding:10px 16px;margin-bottom:9px;cursor:pointer;align-items:flex-start;color:var(--ink)}
.opt:hover{border-color:var(--gold)}
.opt .k{flex:none;width:28px;height:28px;border-radius:50%;border:2px solid var(--gold);color:#9a7618;display:flex;align-items:center;justify-content:center;font-weight:700;font-size:14px;margin-top:1px}
.opt.right{border-color:var(--green);background:#eaf7f0}.opt.right .k{background:var(--green);border-color:var(--green);color:#fff}
.opt.wrong{border-color:var(--red);background:#fdeeee}.opt.wrong .k{background:var(--red);border-color:var(--red);color:#fff}
.explain{display:none;margin-top:10px;background:#fbf3d9;border-radius:10px;padding:10px 16px;font-size:15.5px;color:#5b4a14}.explain.show{display:block}
.score{font-family:var(--serif);font-size:20px;color:var(--navy);margin-top:6px}

.hw{background:#fff;border:1px solid #efe8d6;border-radius:22px;padding:26px 28px}
.hw table{width:100%;border-collapse:collapse;margin:12px 0}
.hw th{font-size:14px;color:var(--gray);font-weight:500;text-align:left;padding:4px 6px}
.hw td{padding:5px 4px}
.hw input[type=text],.hw input[type=number]{width:100%;font:inherit;font-size:16px;padding:9px 12px;border:1.5px solid #e0d6bd;border-radius:10px;background:#fdfbf4}
.hw input:focus{outline:none;border-color:var(--gold);background:#fff}
.hw .tot{display:flex;gap:24px;flex-wrap:wrap;align-items:center;margin-top:8px;color:var(--navy);font-weight:500}
.hw .tot b{font-family:var(--serif);font-size:24px;color:#9a7618}
.range{width:100%;accent-color:var(--gold)}
.rng-l{display:flex;justify-content:space-between;font-size:13px;color:var(--gray)}
.savemsg{font-size:13px;color:var(--gray);margin-top:6px}

.recap li{list-style:none;counter-increment:r;padding:12px 18px 12px 56px;position:relative;background:#fff;border:1px solid #efe8d6;border-radius:14px;margin-bottom:10px}
.recap li::before{content:counter(r);position:absolute;left:16px;top:11px;width:30px;height:30px;border-radius:50%;background:var(--gold);color:var(--navy);font-weight:700;display:flex;align-items:center;justify-content:center}
.recap{counter-reset:r}

.video-box{background:#0b1729;border-radius:20px;padding:14px;overflow:hidden}
.video-box video{width:100%;border-radius:12px;display:block;background:#000;aspect-ratio:16/9}
.chapters{display:flex;flex-wrap:wrap;gap:8px;margin-top:12px}
.chapters button{background:rgba(255,255,255,.07);color:var(--cream);border:1px solid rgba(255,255,255,.14);border-radius:30px;padding:3px 14px;font:inherit;font-size:13px;cursor:pointer}
.chapters button:hover{border-color:var(--gold);color:var(--gold_lt)}
.dl{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin-top:16px}
.dl a{display:block;background:#fff;border:1px solid #efe8d6;border-radius:14px;padding:14px 18px;text-decoration:none}
.dl a:hover{border-color:var(--gold)}.dl b{display:block;color:var(--navy)}.dl span{font-size:13.5px;color:var(--gray)}

.next{background:linear-gradient(135deg,#0f1e35,#162840);color:var(--cream);border-radius:24px;padding:34px 38px}
.next h3{font-family:var(--serif);font-size:26px;color:#fff;margin-bottom:6px}
.next p{color:rgba(245,240,232,.85)}.next .cta-row{margin-top:18px}
details.script{margin-top:12px;background:#fff;border:1px solid #efe8d6;border-radius:14px;padding:8px 18px}
details.script summary{cursor:pointer;font-weight:600;color:var(--navy);padding:6px 0}
details.script p{font-size:15.5px;color:#3d4863;margin:8px 0}
details.script h5{color:#9a7618;margin-top:14px;font-size:14px}
footer.site{background:var(--navy);color:rgba(245,240,232,.7);padding:34px 0;font-size:14px;line-height:1.9}
footer.site b{color:var(--gold_lt)}

/* 登录弹窗 */
.modal{position:fixed;inset:0;background:rgba(7,14,26,.66);display:none;align-items:center;justify-content:center;z-index:200;padding:18px}
.modal.show{display:flex}
.dialog{background:#fff;border-radius:22px;max-width:420px;width:100%;padding:30px 30px 26px;position:relative}
.dialog h3{font-family:var(--serif);font-size:24px;color:var(--navy);margin-bottom:4px}
.dialog p.sub{font-size:14.5px;color:var(--gray);margin-bottom:16px}
.dialog label{display:block;font-size:14px;color:#44506a;margin:10px 0 4px}
.dialog input{width:100%;font:inherit;padding:10px 14px;border:1.5px solid #e0d6bd;border-radius:10px}
.dialog input:focus{outline:none;border-color:var(--gold)}
.dialog .btn{width:100%;margin-top:16px}
.dialog .alt{display:flex;justify-content:space-between;margin-top:12px;font-size:14px}
.dialog .alt button{background:none;border:0;color:#8a6d1e;cursor:pointer;font:inherit;text-decoration:underline}
.dialog .x{position:absolute;right:16px;top:12px;font-size:26px;background:none;border:0;cursor:pointer;color:var(--gray)}
.msg{margin-top:12px;font-size:14px;padding:8px 12px;border-radius:8px;display:none}.msg.err{display:block;background:#fdeeee;color:#7c2a2a}.msg.ok{display:block;background:#eaf7f0;color:#2d5a43}
.consent{font-size:13px;color:var(--gray);margin-top:10px;display:flex;gap:8px;align-items:flex-start}.consent input{width:auto;margin-top:5px}

/* 目录页 */
.cat-hero{padding:56px 0 40px}
.tiers{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin:26px 0 8px}
.tier{border-radius:18px;padding:18px 22px;background:rgba(255,255,255,.07);border:1px solid rgba(255,255,255,.14)}
.tier b{font-family:var(--serif);font-size:20px;color:var(--gold_lt);display:block;margin-bottom:4px}.tier span{font-size:14.5px;color:rgba(245,240,232,.85);line-height:1.6}
.lessons{display:grid;grid-template-columns:repeat(2,1fr);gap:18px;margin-top:20px}
.lcard{display:flex;gap:18px;background:#fff;border:1px solid #efe8d6;border-radius:20px;padding:20px 24px;text-decoration:none;color:inherit;transition:.2s;position:relative}
.lcard:hover{transform:translateY(-2px);box-shadow:0 14px 30px -16px rgba(15,30,53,.3);border-color:var(--gold)}
.lcard .no{flex:none;font-family:var(--serif);font-weight:700;font-size:34px;color:var(--gold);width:64px}
.lcard h3{font-family:var(--serif);font-size:19px;color:var(--navy);line-height:1.4;margin-bottom:4px}
.lcard p{font-size:14.5px;color:#4b5568;line-height:1.6}
.badge{position:absolute;right:16px;top:14px;font-size:12.5px;border-radius:30px;padding:1px 12px;background:#eee8d4;color:#6b5a1e}
.badge.free{background:var(--gold);color:var(--navy);font-weight:600}
.badge.paid{background:var(--navy);color:var(--gold_lt)}
.lcard.locked{background:#fbf9f2}.lcard.locked .no{color:#cfc19a}
.part-t{font-family:var(--serif);font-size:20px;color:var(--navy);margin:34px 0 -4px}
.part-t small{font-family:var(--sans);font-size:14px;color:var(--gray);margin-left:10px;font-weight:400}

@media(max-width:1000px){.layout{grid-template-columns:1fr}.toc{display:none}.hero .grid{grid-template-columns:1fr}.compare,.cards.c2,.cards.c3,.cards.c4,.two,.lessons,.tiers,.dl{grid-template-columns:1fr}.panels{grid-template-columns:1fr}.panel{min-height:0}}
@media(max-width:640px){body{font-size:16px}.wrap{padding:0 16px}.top nav a.hide-s{display:none}.ch-num{font-size:34px}.ch-head h2{font-size:25px}.exercise{padding:20px 18px}.arr{width:100%;transform:rotate(90deg);height:28px}.hero{padding:44px 0 40px}.next{padding:24px 22px}}
@media print{.top,.toc,.copy,footer.site{display:none}.layout{display:block}body{background:#fff}}