*,*::before,*::after{box-sizing:border-box}
:root{--font:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans CJK SC",system-ui,sans-serif;--mono:ui-monospace,SFMono-Regular,Consolas,monospace;
--bg:#f6f3ff;--surface:#fff;--ink:#231a4a;--muted:#5d5487;--line:#ddd4f7;--violet:#5b3fd1;--violet-d:#3d27a1;--violet-soft:#ebe5ff;--peach:#ff8a5b;--peach-soft:#ffe9df;--link:#4b32b8;--link-h:#2f1e80;--focus:#ff8a5b;--ok:#1f8f5a;--side:#231a4a;--side-ink:#efeaff}
[data-theme=dark]{--bg:#13102a;--surface:#1c1838;--ink:#eee9ff;--muted:#b3a9e0;--line:#372f66;--violet:#a893ff;--violet-d:#d3c8ff;--violet-soft:#2a2455;--peach:#ff9c72;--peach-soft:#3d2620;--link:#c3b5ff;--link-h:#e6deff;--focus:#ff9c72;--ok:#5fd6a0;--side:#0d0a20;--side-ink:#efeaff}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.9 var(--font);overflow-wrap:anywhere;-webkit-font-smoothing:antialiased}
a{color:var(--link);text-underline-offset:3px}a:hover{color:var(--link-h)}
:focus-visible{outline:3px solid var(--focus);outline-offset:2px;border-radius:6px}
h1,h2,h3{margin:0;line-height:1.35;color:var(--ink)}p{margin:0 0 1em}
code{font:.9em var(--mono);background:var(--violet-soft);padding:.1em .4em;border-radius:6px}
pre{background:#150f33;color:#e6defc;padding:14px 16px;border-radius:12px;overflow:auto;font:13.5px/1.6 var(--mono)}pre code{background:none;color:inherit;padding:0}
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0)}
.skip:focus{position:static;width:auto;height:auto;clip:auto;display:block;background:#fff;color:#000;padding:6px}
.app{display:grid;grid-template-columns:290px minmax(0,1fr);min-height:100vh}
/* 左侧课程大纲 */
.side{background:var(--side);color:var(--side-ink);position:sticky;top:0;height:100vh;overflow:auto;padding:18px 0}
.side .logo{display:flex;gap:10px;align-items:center;padding:0 20px 14px;text-decoration:none;color:#fff}
.side .logo i{display:grid;place-items:center;width:38px;height:38px;border-radius:12px;background:var(--peach);color:#3a1600;font:900 1.35rem/1 var(--font);font-style:normal}
.side .logo b{display:block}.side .logo small{display:block;font-size:.72rem;color:#c6bbf0;line-height:1.3}
.prog{margin:0 20px 12px;font-size:.8rem;color:#d3c9f7}.prog .bar{height:8px;border-radius:9px;background:#3b3172;margin-top:4px;overflow:hidden}.prog .bar i{display:block;height:100%;width:0;background:var(--peach);transition:width .3s}
.side h2{font:700 .7rem var(--mono);letter-spacing:.14em;color:#b3a7e8;margin:14px 20px 6px}
.outline{list-style:none;margin:0;padding:0}
.outline a{display:flex;gap:10px;align-items:center;padding:.4em 20px;color:var(--side-ink);text-decoration:none;font-size:.9rem;border-left:4px solid transparent;line-height:1.5}
.outline a:hover{background:#33296a}.outline a[aria-current]{background:#33296a;border-left-color:var(--peach);font-weight:700}
.outline a::before{content:attr(data-n);flex:none;display:grid;place-items:center;width:24px;height:24px;border-radius:50%;border:1.5px solid #8a7cd0;font:.72rem var(--mono)}
.outline a.done::before{content:"✓";background:var(--ok);border-color:var(--ok);color:#fff}
.side .menu{list-style:none;margin:0;padding:0}.side .menu a{display:block;padding:.35em 20px;color:var(--side-ink);text-decoration:none;font-size:.9rem}.side .menu a:hover,.side .menu a[aria-current]{background:#33296a}
.side .foot{padding:12px 20px 0;font-size:.74rem;color:#b3a7e8}.side .foot a{color:#efeaff}.side .foot button{font:inherit;font-size:.78rem;background:transparent;color:#efeaff;border:1px solid #6a5db0;border-radius:99px;padding:.15em .8em;margin-top:8px;cursor:pointer}
.topbar{display:none}
.main{min-width:0}
.inner{width:min(820px,100% - 36px);margin-inline:auto;padding:28px 0 56px}
/* 首页 */
.hero{background:linear-gradient(135deg,var(--violet) 0,#8e6bff 100%);color:#fff;border-radius:26px;padding:34px 34px 30px;margin:0 0 20px;position:relative;overflow:hidden}
.hero::after{content:"8";position:absolute;right:20px;top:-40px;font:900 15rem/1 var(--font);color:rgba(255,255,255,.14)}
.hero .tag{display:inline-block;background:var(--peach);color:#3a1600;font-weight:800;font-size:.78rem;padding:.1em .9em;border-radius:99px}
.hero h1{color:#fff;font-size:clamp(1.8rem,5vw,2.7rem);margin:10px 0 8px;position:relative}
.hero p{max-width:34em;margin:0 0 14px;color:#f1ecff;position:relative}
.hero .btn2{display:inline-block;background:#fff;color:var(--violet-d);font-weight:800;padding:.55em 1.4em;border-radius:99px;text-decoration:none;position:relative}
.lessons{display:grid;grid-template-columns:repeat(2,1fr);gap:12px;margin:0 0 1.4em;padding:0;list-style:none}
.lessons a{display:flex;gap:12px;background:var(--surface);border:1.5px solid var(--line);border-radius:18px;padding:12px 14px;text-decoration:none;color:var(--ink);height:100%}
.lessons a:hover{border-color:var(--violet)}
.lessons i{flex:none;display:grid;place-items:center;width:34px;height:34px;border-radius:12px;background:var(--violet-soft);color:var(--violet);font:800 .95rem var(--mono);font-style:normal}
.lessons a.done i{background:var(--ok);color:#fff}
.lessons b{display:block;font-size:.98rem;line-height:1.4}.lessons span{font-size:.83rem;color:var(--muted);line-height:1.5;display:block}
.sec-h{font-size:1.3rem;margin:30px 0 12px}.inner:not(.art)>h2{font-size:1.3rem;margin:32px 0 12px}
/* 首推位 */
.feat{display:grid;grid-template-columns:1fr auto;gap:18px;align-items:center;background:var(--peach-soft);border:2px solid var(--peach);border-radius:22px;padding:20px 22px;margin:0 0 6px}
.feat-tag{display:inline-block;background:var(--peach);color:#3a1600;font-weight:800;font-size:.78rem;padding:.1em .9em;border-radius:99px}
.feat-h{font-size:1.6rem;margin:6px 0 4px}.feat-p{margin:0 0 8px;color:var(--muted)}.feat-s{margin:8px 0 0;font-size:.85rem;color:var(--muted)}
.feat-list{list-style:none;margin:0;padding:0;display:flex;flex-wrap:wrap;gap:8px}.feat-list li{background:var(--surface);border-radius:99px;padding:.1em .9em;font-size:.9rem}
.feat-act{text-align:center}.feat-act small{display:block;margin-top:6px;color:var(--muted);font-size:.75rem}
/* 课页 */
.crumbs{font-size:.83rem;color:var(--muted);margin:0 0 10px}.crumbs a{color:var(--muted)}.crumbs i{font-style:normal;margin:0 .45em;opacity:.6}
.lhead{display:flex;gap:14px;align-items:center;margin:0 0 6px}
.lno{flex:none;display:grid;place-items:center;width:52px;height:52px;border-radius:16px;background:var(--violet);color:#fff;font:800 1.4rem var(--mono)}
.lhead small{display:block;font:700 .74rem var(--mono);letter-spacing:.12em;color:var(--peach)}
.art h1{font-size:clamp(1.6rem,4.4vw,2.2rem)}
.lede{color:var(--muted);font-size:1.03rem;margin:6px 0 14px}
.meta{font-size:.8rem;color:var(--muted);margin:0 0 16px}
.goal{background:var(--surface);border:1.5px solid var(--line);border-radius:18px;padding:14px 18px;margin:0 0 20px}
.goal b{display:block;font:700 .74rem var(--mono);letter-spacing:.12em;color:var(--violet);margin-bottom:2px}.goal p{margin:0}
.art h2{font-size:1.28rem;margin:1.8em 0 .5em}
.art h3{font-size:1.04rem;margin:1.2em 0 .3em}
.lst{padding-left:1.3em;margin:0 0 1.1em}.lst li{margin:.3em 0}
.keyc{background:var(--violet-soft);border-radius:18px;padding:14px 18px;margin:0 0 22px;border-left:8px solid var(--violet)}
.keyc b{display:block;font:700 .74rem var(--mono);letter-spacing:.12em;color:var(--violet);margin-bottom:2px}.keyc p{margin:0;font-size:1.03rem}
.tip{display:flex;gap:10px;background:var(--surface);border:1.5px dashed var(--line);border-radius:16px;padding:10px 14px;margin:0 0 1.2em;font-size:.95rem}
.tip b{flex:none;font-size:.74rem;background:var(--peach);color:#3a1600;border-radius:99px;padding:.1em .7em;height:fit-content;margin-top:.25em}
.tip.warn b{background:#ffd23f}
.tbl-wrap{overflow-x:auto;margin:0 0 1.4em;border:1.5px solid var(--line);border-radius:16px;background:var(--surface)}
.tbl{width:100%;border-collapse:collapse;font-size:.92rem;min-width:500px}
.tbl th,.tbl td{padding:9px 12px;text-align:left;vertical-align:top;border-bottom:1px solid var(--line)}
.tbl thead th{background:var(--violet-soft);white-space:nowrap}.tbl tbody th{white-space:nowrap}.tbl tr:last-child>*{border-bottom:0}
.tbl.wide{min-width:820px}
.pill{display:inline-block;font-size:.72rem;padding:.05em .55em;border:1px solid var(--line);border-radius:99px;white-space:nowrap}
.pill-ok{background:var(--ok);color:#fff;border-color:transparent}.pill-conflict{background:#ffd23f;color:#3a2a00;border-color:transparent}.pill-gap,.pill-none{color:var(--muted);border-style:dashed}
.dimtable td,.dimtable th{text-align:center}.dimtable tbody th{text-align:left}
.dolist{list-style:none;margin:0 0 1.3em;padding:0;counter-reset:s}
.dolist li{position:relative;padding:0 0 12px 46px;counter-increment:s}
.dolist li::before{content:counter(s);position:absolute;left:0;top:0;width:32px;height:32px;border-radius:50%;background:var(--violet);color:#fff;display:grid;place-items:center;font-weight:800}
.dolist h3{margin:0 0 2px!important;font-size:1.02rem}.dolist p{margin:0}.dolist pre{margin-top:6px}
.quiz{background:var(--surface);border:2px solid var(--violet);border-radius:20px;padding:16px 20px;margin:26px 0 0}
.quiz h2{margin:0 0 8px!important;font-size:1.1rem!important}
.quiz label{display:flex;gap:10px;padding:.3em 0;cursor:pointer;font-size:.95rem}.quiz input{accent-color:var(--violet);width:18px;height:18px;margin-top:.35em;flex:none}
.done-btn{margin-top:12px;font:700 .95rem var(--font);background:var(--violet);color:#fff;border:0;border-radius:99px;padding:.55em 1.5em;cursor:pointer}
.done-btn[aria-pressed=true]{background:var(--ok)}
.pn{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin:24px 0 0}
.pn a{display:block;background:var(--surface);border:1.5px solid var(--line);border-radius:16px;padding:10px 14px;text-decoration:none;color:var(--ink)}
.pn a small{display:block;font-size:.74rem;color:var(--muted)}.pn a:last-child{text-align:right}.pn a:hover{border-color:var(--violet)}
.faq{margin:1.6em 0 1em}.faq>h2{margin-bottom:10px}
.faq details{background:var(--surface);border:1.5px solid var(--line);border-radius:16px;margin:0 0 8px;padding:0 16px}
.faq summary{cursor:pointer;padding:10px 0;font-weight:700}.faq details p{margin:0 0 10px;color:var(--muted)}
.ctabox{background:var(--surface);border:2px dashed var(--peach);border-radius:18px;padding:16px 18px;margin:1.4em 0;text-align:center}
.ctabox-t{font-weight:700;margin:0 0 10px}.bc-disc{display:block;font-size:.78rem;color:var(--muted);margin-top:8px}
.btn{display:inline-flex;align-items:center;padding:.55em 1.3em;border-radius:99px;background:var(--violet);color:#fff;font:700 .95rem var(--font);text-decoration:none;border:0;cursor:pointer}
.btn:hover{filter:brightness(1.1);color:#fff}.btn-aff{background:var(--peach);color:#3a1600}.btn-aff:hover{color:#3a1600}.btn-lg{padding:.75em 1.6em}
.linkcards{list-style:none;margin:0 0 1.2em;padding:0;display:grid;gap:8px}
.linkcards li{background:var(--surface);border:1.5px solid var(--line);border-radius:14px;padding:8px 14px}
.linkcards a{font-weight:700}.linkcards span{display:block;font-size:.85rem;color:var(--muted)}
.cross{background:var(--surface);border:1.5px dashed var(--line);border-radius:14px;padding:9px 14px;margin:0 0 1.2em;font-size:.92rem}.cross-lead{color:var(--muted);margin-right:.5em}
.chips{list-style:none;margin:0 0 1.2em;padding:0;display:flex;flex-wrap:wrap;gap:8px}.chips li{background:var(--violet-soft);border-radius:99px;padding:.05em .9em;font-size:.9rem}
.bc-list{display:grid;gap:12px;margin:0 0 1.4em}
.bc{background:var(--surface);border:1.5px solid var(--line);border-radius:18px;padding:14px 18px}
.bc.is-top{border-color:var(--peach);border-width:2px}
.bc h3{font-size:1.06rem;display:flex;gap:8px;align-items:center;flex-wrap:wrap}.bc h3 small{color:var(--muted);font-weight:400}
.bc .badge{font-size:.72rem;font-weight:800;background:var(--peach);color:#3a1600;border-radius:99px;padding:.05em .7em}
.bc-tag{margin:.3em 0 .5em;color:var(--muted);font-size:.93rem}
.bc .lesson{font-size:.88rem;background:var(--violet-soft);border-radius:12px;padding:8px 12px;margin:0 0 .6em}
.bc-foot{display:flex;flex-wrap:wrap;align-items:center;gap:10px}
.ft{border-top:1px solid var(--line);padding:20px 0 26px;font-size:.86rem;color:var(--muted)}
.ft ul{list-style:none;padding:0;margin:0 0 10px;display:flex;flex-wrap:wrap;gap:6px 16px}.ft a{color:var(--ink)}.ft p{margin:0 0 6px}
.notfound{text-align:center;padding:70px 0}.notfound b{display:block;font:900 5rem/1 var(--font);color:var(--violet)}
@media(max-width:900px){.app{grid-template-columns:1fr}.side{display:none;position:static;height:auto}.side.open{display:block}
.topbar{display:flex;align-items:center;gap:10px;background:var(--side);color:#fff;padding:10px 16px;position:sticky;top:0;z-index:30}
.topbar a{color:#fff;text-decoration:none;font-weight:800;margin-right:auto}.topbar button{font:inherit;background:transparent;color:#fff;border:1px solid #6a5db0;border-radius:99px;padding:.2em .9em;cursor:pointer}
.lessons{grid-template-columns:1fr}.feat{grid-template-columns:1fr}.pn{grid-template-columns:1fr}.pn a:last-child{text-align:left}.hero{padding:26px 22px}}

.friend-links{display:flex;flex-wrap:wrap;align-items:center;gap:10px 18px;border-top:1px solid var(--line);padding:18px 0;margin:24px 0 16px}
.friend-links .label{font-weight:700;font-size:.88rem;color:var(--muted);margin-right:4px}
.friend-links a{font-size:.88rem;color:var(--muted);text-decoration:none}
.friend-links a:hover{color:var(--link);text-decoration:underline}