:root{--ink:#15211d;--muted:#6d7b75;--paper:#f7f8f3;--line:#dde3dc;--green:#1f9d67;--lime:#b9ed86;--dark:#13221d;--shadow:0 18px 60px rgba(24,45,36,.09)}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;color:var(--ink);background:var(--paper);font-family:Inter,-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;-webkit-font-smoothing:antialiased}.reading-progress{position:fixed;z-index:50;inset:0 auto auto 0;height:3px;width:0;background:linear-gradient(90deg,var(--green),var(--lime))}
.sidebar{position:fixed;z-index:30;inset:0 auto 0 0;width:320px;padding:30px 22px 18px;color:#fff;background:radial-gradient(circle at 0 0,rgba(71,181,126,.2),transparent 32%),var(--dark);display:flex;flex-direction:column}.brand{display:flex;align-items:center;gap:12px;margin:0 10px 14px;color:inherit;text-decoration:none}.brand-mark{display:grid;place-items:center;width:42px;height:42px;border-radius:13px;color:#102119;background:var(--lime);font-weight:900;font-size:20px;transform:rotate(-3deg)}.brand b,.brand small{display:block}.brand b{font-size:17px}.brand small{margin-top:2px;color:#94a69e;font-size:12px}.home-link{display:block;margin:0 10px 20px;padding:9px 11px;border:1px solid #ffffff14;border-radius:10px;color:#b5c3bd;background:#ffffff0a;text-decoration:none;font-size:12px;transition:.18s}.home-link:hover{color:#fff;background:#ffffff12}.search{display:flex;align-items:center;gap:10px;margin-bottom:21px;padding:11px 13px;border:1px solid #ffffff1a;border-radius:11px;background:#ffffff0e}.search span{color:#94a69e;font-size:20px}.search input{width:100%;border:0;outline:0;color:#fff;background:transparent;font:inherit;font-size:13px}.search input::placeholder{color:#82948c}.sidebar nav{overflow:auto;scrollbar-width:thin;scrollbar-color:#3a5047 transparent;padding-right:3px}.nav-section{margin-bottom:20px}.nav-section h2{display:flex;justify-content:space-between;margin:0 9px 8px;color:#94a69e;font-size:11px;letter-spacing:.1em}.nav-section h2 span{display:grid;place-items:center;min-width:20px;height:20px;border-radius:8px;background:#ffffff12;font-size:10px}.nav-lessons a{display:grid;grid-template-columns:28px 1fr;gap:8px;margin:2px 0;padding:9px 10px;border-radius:10px;color:#b5c3bd;text-decoration:none;transition:.18s}.nav-lessons a:hover{color:#fff;background:#ffffff0e}.nav-lessons a.active{color:#fff;background:#7fd8a321;box-shadow:inset 3px 0 var(--lime)}.nav-lessons a>span{color:#678079;font:700 10px/1.7 ui-monospace,monospace}.nav-lessons a.active>span{color:var(--lime)}.nav-lessons em{font-style:normal;font-size:13px;line-height:1.55}.sidebar footer{margin-top:auto;padding:16px 10px 0;color:#6f857b;font-size:11px}.status-dot{display:inline-block;width:6px;height:6px;margin-right:7px;border-radius:50%;background:var(--lime)}
main{margin-left:320px;min-height:100vh}.topline{display:flex;justify-content:space-between;max-width:900px;margin:auto;padding:28px 38px 0;color:var(--muted);font-size:12px}.lesson{max-width:900px;margin:auto;padding:70px 38px 90px}.lesson-header{padding-bottom:42px;border-bottom:1px solid var(--line)}.eyebrow{margin:0 0 15px;color:var(--green);font:800 11px/1.4 ui-monospace,monospace;letter-spacing:.13em}.lesson-header h1{max-width:760px;margin:0;font-family:ui-serif,"Songti SC","STSong",serif;font-size:clamp(38px,5vw,64px);line-height:1.14;letter-spacing:-.035em}.meta{display:flex;margin-top:28px;color:var(--muted);font-size:13px}.meta span+span:before{content:"·";margin:0 11px;color:#b0bab5}
.article-content{padding:42px 0 20px;font-size:17px;line-height:1.95}.article-content>*:first-child{margin-top:0}.article-content p{margin:0 0 1.35em}.article-content h1,.article-content h2,.article-content h3,.article-content h4{margin:2.2em 0 .75em;color:#10251c;line-height:1.4;font-family:ui-serif,"Songti SC","STSong",serif}.article-content h1,.article-content h2{font-size:29px}.article-content h3,.article-content h4{font-size:22px}.article-content strong,.article-content b{color:#0d5438;font-weight:750}.article-content a{color:#0e6845;text-underline-offset:3px}.article-content blockquote{margin:28px 0;padding:20px 24px;border:0;border-left:4px solid var(--green);border-radius:0 12px 12px 0;color:#385047;background:#edf6ef}.article-content img{display:block;max-width:100%;height:auto;margin:32px auto;border-radius:12px;box-shadow:0 12px 40px #19362a1a;background:#fff}.article-content pre{max-width:100%;overflow:auto;margin:28px 0;padding:22px 24px;border-radius:13px;color:#dff7e8;background:#12251d;font:13px/1.75 ui-monospace,monospace}.article-content code{padding:.12em .35em;border-radius:5px;color:#126c49;background:#e7f1e9;font:.88em ui-monospace,monospace}.article-content pre code{padding:0;color:inherit;background:none}.article-content ul,.article-content ol{padding-left:1.5em}.article-content li{margin:.45em 0}.article-content table{display:block;overflow-x:auto;width:100%;border-collapse:collapse;margin:28px 0;font-size:14px}.article-content th,.article-content td{padding:11px 14px;border:1px solid var(--line);text-align:left}.article-content th{background:#edf4ee}
.lesson-audio{display:grid;grid-template-columns:1fr minmax(260px,390px);gap:18px;align-items:center;margin:0 0 34px;padding:18px 20px;border:1px solid #cce6d6;border-radius:18px;background:linear-gradient(135deg,#f4fbf4,#eaf6ef);box-shadow:0 14px 35px #153d2b12}.lesson-audio span{display:block;margin-bottom:5px;color:var(--green);font:800 11px/1.2 ui-monospace,monospace;letter-spacing:.12em;text-transform:uppercase}.lesson-audio strong{display:block;color:#153b2b;font-size:15px;line-height:1.45}.lesson-audio audio{width:100%;height:38px}.pdf-source-note{display:flex;gap:14px;align-items:center;margin:0 0 28px;padding:15px 18px;border-radius:14px;color:#385047;background:#edf6ef}.pdf-source-note span{display:grid;place-items:center;min-width:42px;height:28px;border-radius:999px;color:#0e6845;background:#d6efdf;font:800 11px/1 ui-monospace,monospace}.pdf-source-note p{margin:0!important;font-size:14px}
.pager{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-top:65px;padding-top:28px;border-top:1px solid var(--line)}.pager a{display:flex;min-height:122px;flex-direction:column;justify-content:space-between;padding:22px;border:1px solid var(--line);border-radius:15px;color:inherit;text-decoration:none;background:#ffffff8c;transition:.2s}.pager a:hover{transform:translateY(-3px);border-color:#9bcbb2;background:#fff;box-shadow:var(--shadow)}.pager .next{text-align:right}.pager small{color:var(--green);font-weight:750}.pager strong{font-size:14px;line-height:1.5}.comments{margin-top:85px}.comments>header{display:flex;justify-content:space-between;align-items:end;margin-bottom:22px}.comments h2{margin:0;font:700 30px/1.2 ui-serif,"Songti SC",serif}.comments>header>span{padding:6px 11px;border-radius:20px;color:#0e6845;background:#e3f1e7;font-size:12px}.comment{display:grid;grid-template-columns:40px 1fr;gap:14px;padding:22px 0;border-top:1px solid var(--line)}.avatar{display:grid;place-items:center;width:40px;height:40px;border-radius:12px;color:#164a35;background:linear-gradient(135deg,var(--lime),#87d9ab);font-size:14px;font-weight:800}.comment-body header{display:flex;align-items:center;gap:10px}.comment-body strong{font-size:14px}.comment-body header span{color:#92a099;font-size:11px}.comment-body header .likes{margin-left:auto;color:var(--green)}.comment-body p{margin:8px 0 0;color:#43534c;font-size:14px;line-height:1.75}.empty-comments{padding:35px;border:1px dashed var(--line);border-radius:14px;color:var(--muted);text-align:center}.menu-button,.scrim{display:none}.back-to-top{position:fixed;z-index:10;right:24px;bottom:24px;width:42px;height:42px;border:1px solid var(--line);border-radius:13px;opacity:0;pointer-events:none;color:var(--ink);background:#fff;box-shadow:var(--shadow);transition:.2s;cursor:pointer}.back-to-top.show{opacity:1;pointer-events:auto}
@media(max-width:920px){.sidebar{transform:translateX(-102%);transition:.25s}.sidebar-open .sidebar{transform:none}main{margin-left:0}.menu-button{display:block;position:fixed;z-index:25;top:18px;left:18px;width:43px;height:43px;border:1px solid var(--line);border-radius:12px;color:var(--ink);background:#ffffffeb;box-shadow:0 8px 24px #1428201a;font-size:18px}.scrim{position:fixed;z-index:20;inset:0;border:0;background:#07140f73}.sidebar-open .scrim{display:block}.topline{padding-left:78px}}@media(max-width:620px){.sidebar{width:min(88vw,320px)}.topline{padding:31px 20px 0 78px}.topline span:first-child{display:none}.lesson{padding:56px 20px 65px}.lesson-header h1{font-size:37px}.article-content{padding-top:32px;font-size:16px}.article-content h1,.article-content h2{font-size:25px}.pager{grid-template-columns:1fr}.pager>span{display:none}.pager a{min-height:105px}.comments{margin-top:65px}.comment{grid-template-columns:34px 1fr}.avatar{width:34px;height:34px;border-radius:10px}}
@media(max-width:720px){.lesson-audio{grid-template-columns:1fr}.lesson-audio audio{height:42px}}
.comment-body{min-width:0}.comment-body p{overflow-wrap:anywhere}
.article-content pre{position:relative;padding-top:48px;border:0}.article-content pre code{display:block;white-space:pre;tab-size:2}.copy-code{position:absolute;top:12px;right:12px;padding:6px 10px;border:1px solid #ffffff2e;border-radius:7px;color:#bfe8cf;background:#ffffff0d;font:12px/1.2 inherit;cursor:pointer}.copy-code:hover{color:#fff;background:#ffffff1c}
.lesson-layout{display:grid;grid-template-columns:minmax(0,1fr) 210px;gap:42px;align-items:start}.article-content{min-width:0}.outline-wrap{grid-column:2;grid-row:1;position:sticky;top:28px;order:2}.article-content{grid-column:1;grid-row:1}.article-outline{padding:16px 0 16px 18px;border-left:1px solid var(--line);font-size:13px}.article-outline h2{margin:0 0 12px;color:#789088;font:800 11px/1.3 ui-monospace,monospace;letter-spacing:.12em;text-transform:uppercase}.article-outline a{display:block;margin:0 0 9px;color:#60736c;text-decoration:none;line-height:1.45;transition:.18s}.article-outline a:hover,.article-outline a.active{color:#0e6845}.article-outline .outline-h3{padding-left:12px;font-size:12px}.article-outline .outline-h4{padding-left:24px;font-size:12px;color:#87958f}.outline-empty{margin:0;color:#87958f;font-size:13px}.article-content h2,.article-content h3,.article-content h4{scroll-margin-top:28px}
@media(max-width:1180px){.lesson-layout{display:block}.outline-wrap{position:static;margin:0 0 8px}.article-outline{display:flex;gap:10px;overflow:auto;margin-top:24px;padding:12px 0;border:0;border-bottom:1px solid var(--line);scrollbar-width:thin}.article-outline h2{flex:0 0 auto;margin:2px 4px 0 0}.article-outline a{flex:0 0 auto;margin:0;padding:6px 10px;border-radius:999px;background:#edf6ef;white-space:nowrap}.article-outline .outline-h3,.article-outline .outline-h4{padding-left:10px;font-size:13px}}