:root{--font-serif: "Fraunces", "Newsreader", Georgia, "Times New Roman", serif;--font-sans: "Hanken Grotesk", "SF Pro Display", system-ui, -apple-system, sans-serif;--font-mono: "JetBrains Mono", "SF Mono", ui-monospace, monospace;--paper: #f7f5f1;--paper-2: #f1eee8;--surface: #ffffff;--surface-2: #fbfaf8;--ink: #23201b;--ink-strong: #171410;--muted: #7a746a;--faint: #a7a094;--line: #e7e3da;--line-strong: #d8d2c6;--accent: #b0512f;--accent-ink: #8c3d20;--accent-wash: #f6ece5;--red-bg: #fbeceb;--red-ink: #9a3a2f;--blue-bg: #e7f1f8;--blue-ink: #2a6489;--green-bg: #eaf1e7;--green-ink: #3c6238;--yellow-bg: #f8f0d8;--yellow-ink: #8a6410;--neutral-bg: #efece5;--neutral-ink: #6f6a60;--r-xs: 4px;--r-sm: 6px;--r: 10px;--r-lg: 14px;--r-pill: 999px;--shadow-hover: 0 2px 10px rgba(31, 27, 20, .05);--shadow-pop: 0 8px 30px rgba(31, 27, 20, .09);--nav-h: 60px;--maxw: 1160px;--ease: cubic-bezier(.16, 1, .3, 1)}*{margin:0;padding:0;box-sizing:border-box}html{-webkit-text-size-adjust:100%}body{font-family:var(--font-sans);background:var(--paper);color:var(--ink);font-size:15px;line-height:1.6;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}a{color:inherit;text-decoration:none}button,input,select,textarea{font:inherit;color:inherit}button{cursor:pointer;background:none;border:none}::selection{background:#b0512f29}h1,h2,h3,h4{font-family:var(--font-serif);color:var(--ink-strong);font-weight:500;letter-spacing:-.02em;line-height:1.12}.mono{font-family:var(--font-mono)}.wrap{max-width:var(--maxw);margin:0 auto;padding:0 28px}.stack>*+*{margin-top:16px}.muted{color:var(--muted)}.faint{color:var(--faint)}.row{display:flex;align-items:center;gap:12px}.spread{display:flex;align-items:center;justify-content:space-between;gap:16px}.eyebrow{font-family:var(--font-mono);font-size:11px;letter-spacing:.14em;text-transform:uppercase;color:var(--muted)}.btn{display:inline-flex;align-items:center;gap:8px;justify-content:center;font-weight:600;font-size:14px;padding:9px 16px;border-radius:var(--r-sm);border:1px solid transparent;transition:background .18s var(--ease),transform .1s var(--ease),border-color .18s var(--ease);white-space:nowrap}.btn:active{transform:scale(.98)}.btn-primary{background:var(--ink-strong);color:#fff}.btn-primary:hover{background:#322c24}.btn-accent{background:var(--accent);color:#fff}.btn-accent:hover{background:var(--accent-ink)}.btn-ghost{border-color:var(--line-strong);color:var(--ink);background:var(--surface)}.btn-ghost:hover{background:var(--surface-2);border-color:var(--muted)}.btn-subtle{color:var(--muted)}.btn-subtle:hover{color:var(--ink);background:var(--paper-2)}.btn-sm{padding:6px 12px;font-size:13px}.btn-lg{padding:12px 22px;font-size:15px}.btn:disabled{opacity:.45;cursor:not-allowed}.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--r-lg);padding:24px}.card-hover{transition:box-shadow .2s var(--ease),border-color .2s var(--ease),transform .2s var(--ease)}.card-hover:hover{box-shadow:var(--shadow-hover);border-color:var(--line-strong)}.badge{display:inline-flex;align-items:center;gap:5px;font-size:11px;font-weight:600;letter-spacing:.04em;text-transform:uppercase;padding:3px 9px;border-radius:var(--r-pill);font-family:var(--font-mono)}.badge-neutral{background:var(--neutral-bg);color:var(--neutral-ink)}.badge-green{background:var(--green-bg);color:var(--green-ink)}.badge-blue{background:var(--blue-bg);color:var(--blue-ink)}.badge-red{background:var(--red-bg);color:var(--red-ink)}.badge-yellow{background:var(--yellow-bg);color:var(--yellow-ink)}.badge-accent{background:var(--accent-wash);color:var(--accent-ink)}.badge-dot:before{content:"";width:6px;height:6px;border-radius:50%;background:currentColor;display:inline-block}.progress{height:6px;background:var(--paper-2);border-radius:var(--r-pill);overflow:hidden}.progress>span{display:block;height:100%;background:var(--accent);border-radius:var(--r-pill);transition:width .5s var(--ease)}.progress.green>span{background:var(--green-ink)}.field{display:block}.field label{display:block;font-size:13px;font-weight:600;color:var(--ink);margin-bottom:6px}.input,.select,textarea.input{width:100%;background:var(--surface);border:1px solid var(--line-strong);border-radius:var(--r-sm);padding:9px 12px;font-size:14px;transition:border-color .15s var(--ease),box-shadow .15s var(--ease)}.input:focus,.select:focus,textarea.input:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-wash)}kbd{font-family:var(--font-mono);font-size:12px;border:1px solid var(--line-strong);border-bottom-width:2px;border-radius:var(--r-xs);background:var(--paper);padding:1px 6px;color:var(--ink)}.table{width:100%;border-collapse:collapse;font-size:14px}.table th{text-align:left;font-family:var(--font-mono);font-size:11px;letter-spacing:.06em;text-transform:uppercase;color:var(--muted);font-weight:500;padding:10px 14px;border-bottom:1px solid var(--line)}.table td{padding:13px 14px;border-bottom:1px solid var(--line);vertical-align:middle}.table tbody tr{transition:background .12s var(--ease)}.table tbody tr:hover{background:var(--surface-2)}.table tr.clickable{cursor:pointer}.avatar{width:34px;height:34px;border-radius:50%;display:inline-flex;align-items:center;justify-content:center;font-weight:600;font-size:13px;background:var(--accent-wash);color:var(--accent-ink);flex-shrink:0;border:1px solid var(--line);overflow:hidden}.avatar img{width:100%;height:100%;object-fit:cover}.divider{height:1px;background:var(--line);border:0}.spinner{width:18px;height:18px;border:2px solid var(--line-strong);border-top-color:var(--accent);border-radius:50%;animation:spin .7s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.reveal{opacity:0;transform:translateY(12px);animation:reveal .6s var(--ease) forwards}@keyframes reveal{to{opacity:1;transform:none}}@media(prefers-reduced-motion:reduce){.reveal{animation:none;opacity:1;transform:none}.progress>span{transition:none}}.course-body{font-size:16.5px;line-height:1.75;color:var(--ink)}.course-body>*+*{margin-top:20px}.course-body h3{font-size:24px;margin-top:34px}.course-body h4{font-size:19px;margin-top:26px;font-weight:600}.course-body p{margin:0}.course-body a{color:var(--accent-ink);text-decoration:underline;text-decoration-thickness:1px;text-underline-offset:2px}.course-body a:hover{color:var(--accent)}.course-body strong{font-weight:600;color:var(--ink-strong)}.course-body ul,.course-body ol{padding-left:24px}.course-body li{margin:7px 0}.course-body blockquote{border-left:3px solid var(--accent);padding:4px 0 4px 20px;margin:24px 0;font-family:var(--font-serif);font-size:19px;font-style:italic;color:var(--ink-strong);line-height:1.5}.course-body table{width:100%;border-collapse:collapse;font-size:14.5px;margin:8px 0}.course-body th,.course-body td{text-align:left;padding:10px 14px;border:1px solid var(--line)}.course-body thead th{background:var(--paper-2);font-family:var(--font-mono);font-size:12px;text-transform:uppercase;letter-spacing:.04em;color:var(--muted);font-weight:500}.course-body code{font-family:var(--font-mono);font-size:.88em;background:var(--paper-2);padding:2px 6px;border-radius:var(--r-xs)}.course-body img{max-width:100%;border-radius:var(--r);border:1px solid var(--line)}.course-body .callout{display:flex;gap:14px;padding:16px 18px;border-radius:var(--r);border:1px solid var(--line);background:var(--surface-2);align-items:flex-start}.course-body .callout .callout-icon{flex-shrink:0;width:24px;height:24px;border-radius:50%;display:inline-flex;align-items:center;justify-content:center;font-family:var(--font-mono);font-size:13px;font-weight:600;text-transform:lowercase;background:var(--neutral-bg);color:var(--neutral-ink);margin-top:1px}.course-body .callout .callout-content>*+*{margin-top:8px}.course-body .callout.info{background:var(--blue-bg);border-color:transparent}.course-body .callout.info .callout-icon{background:#2a648929;color:var(--blue-ink)}.course-body .callout.success{background:var(--green-bg);border-color:transparent}.course-body .callout.success .callout-icon{background:#3c623829;color:var(--green-ink)}.course-body .callout.warning{background:var(--yellow-bg);border-color:transparent}.course-body .callout.warning .callout-icon{background:#8a641029;color:var(--yellow-ink)}.course-body .callout.danger{background:var(--red-bg);border-color:transparent}.course-body .callout.danger .callout-icon{background:#9a3a2f29;color:var(--red-ink)}.brand{display:inline-flex;align-items:center;gap:9px}.brand-mark{color:var(--accent);display:inline-flex}.brand-word{font-family:var(--font-serif);font-size:22px;font-weight:600;letter-spacing:-.02em;color:var(--ink-strong)}.brand-mark.lg{transform:scale(1.15)}.brand-word.lg{font-size:30px}.nav{position:sticky;top:0;z-index:50;background:#f7f5f1cc;-webkit-backdrop-filter:saturate(180%) blur(12px);backdrop-filter:saturate(180%) blur(12px);border-bottom:1px solid transparent;transition:border-color .2s var(--ease),background .2s var(--ease)}.nav-scrolled{border-bottom-color:var(--line)}.nav-inner{height:var(--nav-h);display:flex;align-items:center;gap:28px}.nav-links{display:flex;align-items:center;gap:4px;flex:1}.nav-link{position:relative;font-size:14px;font-weight:500;color:var(--muted);padding:7px 12px;border-radius:var(--r-sm);transition:color .15s var(--ease),background .15s var(--ease)}.nav-link:hover{color:var(--ink);background:var(--paper-2)}.nav-link.active{color:var(--ink-strong)}.nav-link.active:after{content:"";position:absolute;left:12px;right:12px;bottom:-1px;height:2px;background:var(--accent);border-radius:2px}.nav-user{position:relative}.user-chip{display:flex;align-items:center;gap:9px;padding:5px 8px 5px 5px;border-radius:var(--r-pill);border:1px solid transparent;transition:background .15s var(--ease),border-color .15s}.user-chip:hover{background:var(--surface);border-color:var(--line)}.user-meta{display:flex;flex-direction:column;align-items:flex-start;line-height:1.15}.user-name{font-size:13.5px;font-weight:600;color:var(--ink-strong)}.user-role{font-size:11px;color:var(--muted)}.menu{position:absolute;right:0;top:calc(100% + 8px);width:240px;background:var(--surface);border:1px solid var(--line);border-radius:var(--r);box-shadow:var(--shadow-pop);padding:6px;z-index:60}.menu-head{padding:10px 12px 12px}.menu-item{display:flex;align-items:center;gap:10px;width:100%;text-align:left;padding:9px 12px;border-radius:var(--r-sm);font-size:14px;color:var(--ink);transition:background .12s}.menu-item:hover{background:var(--paper-2)}.menu-item.danger{color:var(--red-ink)}.content{min-height:calc(100vh - var(--nav-h));padding-bottom:90px}.page{max-width:var(--maxw);margin:0 auto;padding:40px 28px 0}.page-narrow{max-width:860px}.page-head{margin-bottom:30px}.page-eyebrow{margin-bottom:8px}.page-title{font-size:34px;letter-spacing:-.025em}.page-lead{color:var(--muted);font-size:16px;margin-top:8px;max-width:640px}.page-actions{display:flex;gap:10px;align-items:center}.section-title{font-size:15px;font-weight:600;font-family:var(--font-sans);color:var(--ink-strong);letter-spacing:0;margin-bottom:14px;display:flex;align-items:center;gap:8px}.toolbar{display:flex;gap:10px;align-items:center;flex-wrap:wrap;margin-bottom:20px}.search-box{position:relative;flex:1;min-width:200px;max-width:340px}.search-box .input{padding-left:36px}.search-box svg{position:absolute;left:12px;top:50%;transform:translateY(-50%);color:var(--faint)}.seg{display:inline-flex;background:var(--paper-2);border:1px solid var(--line);border-radius:var(--r-sm);padding:3px;gap:2px}.seg button{font-size:13px;font-weight:500;color:var(--muted);padding:5px 12px;border-radius:5px}.seg button.on{background:var(--surface);color:var(--ink-strong);box-shadow:var(--shadow-hover)}.stat-row{display:grid;grid-template-columns:repeat(auto-fit,minmax(160px,1fr));gap:14px}.stat-tile{background:var(--surface);border:1px solid var(--line);border-radius:var(--r-lg);padding:20px 22px;position:relative}.stat-icon{position:absolute;top:18px;right:18px;color:var(--faint)}.stat-value{font-family:var(--font-serif);font-size:38px;font-weight:500;letter-spacing:-.02em;color:var(--ink-strong);line-height:1}.stat-value.tone-red{color:var(--red-ink)}.stat-value.tone-green{color:var(--green-ink)}.stat-value.tone-yellow{color:var(--yellow-ink)}.stat-label{font-size:13px;color:var(--muted);margin-top:8px}.stat-sub{font-size:12px;color:var(--faint);margin-top:3px}.empty{text-align:center;padding:56px 24px}.empty-icon{display:inline-flex;align-items:center;justify-content:center;width:48px;height:48px;border-radius:50%;background:var(--paper-2);color:var(--muted);margin-bottom:14px}.empty-title{font-family:var(--font-serif);font-size:20px;color:var(--ink-strong)}.empty-sub{color:var(--muted);margin-top:6px;font-size:14px}.grid{display:grid;gap:16px}.grid-2{grid-template-columns:1.5fr 1fr}.grid-3{grid-template-columns:repeat(3,1fr)}@media(max-width:900px){.grid-2,.grid-3{grid-template-columns:1fr}}.course-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:16px}.course-card{display:flex;flex-direction:column;gap:14px;cursor:pointer}.course-card .cc-top{display:flex;align-items:flex-start;justify-content:space-between;gap:12px}.course-ico{width:42px;height:42px;border-radius:var(--r);background:var(--accent-wash);color:var(--accent-ink);display:inline-flex;align-items:center;justify-content:center;flex-shrink:0}.course-card h3{font-size:19px}.cc-desc{color:var(--muted);font-size:14px;line-height:1.55;flex:1}.cc-meta{display:flex;align-items:center;gap:12px;font-size:12.5px;color:var(--faint);font-family:var(--font-mono)}.cc-foot{display:flex;align-items:center;justify-content:space-between;gap:10px;padding-top:14px;border-top:1px solid var(--line)}.list{background:var(--surface);border:1px solid var(--line);border-radius:var(--r-lg);overflow:hidden}.list-row{display:flex;align-items:center;gap:14px;padding:14px 18px;border-bottom:1px solid var(--line);transition:background .12s}.list-row:last-child{border-bottom:none}.list-row.clickable{cursor:pointer}.list-row.clickable:hover{background:var(--surface-2)}.lr-main{flex:1;min-width:0}.lr-title{font-weight:600;color:var(--ink-strong);font-size:14.5px}.lr-sub{font-size:12.5px;color:var(--muted);margin-top:2px}.table-wrap{background:var(--surface);border:1px solid var(--line);border-radius:var(--r-lg);overflow-x:auto}.feed-item{display:flex;gap:12px;padding:12px 0;border-bottom:1px solid var(--line)}.feed-item:last-child{border-bottom:none}.feed-dot{width:30px;height:30px;border-radius:50%;display:flex;align-items:center;justify-content:center;flex-shrink:0;background:var(--paper-2);color:var(--muted)}.feed-body{flex:1;font-size:13.5px}.feed-time{font-size:11.5px;color:var(--faint);font-family:var(--font-mono)}.login{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:24px;position:relative;overflow:hidden}.login-ambient{position:fixed;top:0;right:0;bottom:0;left:0;pointer-events:none;background:radial-gradient(60% 50% at 20% 15%,rgba(176,81,47,.05),transparent 70%),radial-gradient(50% 45% at 85% 85%,rgba(176,81,47,.04),transparent 70%)}.login-card{position:relative;width:100%;max-width:452px;background:var(--surface);border:1px solid var(--line);border-radius:18px;padding:40px;box-shadow:var(--shadow-pop)}.login-brand{display:flex;align-items:center;gap:11px}.login-title{font-size:32px;margin-top:12px;letter-spacing:-.03em}.login-lead{color:var(--muted);font-size:15px;margin-top:12px;line-height:1.6}.login-google{width:100%;margin-top:26px;background:var(--ink-strong)}.login-note{font-size:12.5px;color:var(--faint);margin-top:12px;text-align:center}.login-error{display:flex;align-items:center;gap:8px;background:var(--red-bg);color:var(--red-ink);font-size:13px;padding:10px 14px;border-radius:var(--r-sm);margin-top:18px}.login-dev{margin-top:26px;padding-top:22px;border-top:1px dashed var(--line-strong)}.login-dev-label{font-family:var(--font-mono);font-size:11px;text-transform:uppercase;letter-spacing:.1em;color:var(--faint);margin-bottom:12px}.login-dev-grid{display:grid;grid-template-columns:1fr 1fr;gap:8px}.player{display:grid;grid-template-columns:264px 1fr;gap:34px;align-items:start;max-width:1120px;margin:0 auto;padding:34px 28px 0}.player-side{position:sticky;top:calc(var(--nav-h) + 24px)}.player-side .back{display:inline-flex;align-items:center;gap:6px;color:var(--muted);font-size:13px;margin-bottom:20px}.player-side .back:hover{color:var(--ink)}.p-progress-label{display:flex;justify-content:space-between;font-size:12px;color:var(--muted);margin:14px 0 8px;font-family:var(--font-mono)}.toc{margin-top:22px;display:flex;flex-direction:column;gap:2px}.toc-item{display:flex;align-items:center;gap:10px;padding:9px 10px;border-radius:var(--r-sm);font-size:13.5px;color:var(--muted);text-align:left;width:100%;transition:background .12s,color .12s}.toc-item:hover{background:var(--paper-2);color:var(--ink)}.toc-item.on{background:var(--surface);color:var(--ink-strong);font-weight:600;box-shadow:var(--shadow-hover)}.toc-check{width:18px;height:18px;border-radius:50%;border:1.5px solid var(--line-strong);flex-shrink:0;display:flex;align-items:center;justify-content:center;color:transparent}.toc-check.done{background:var(--green-ink);border-color:var(--green-ink);color:#fff}.toc-item.quiz .toc-check{border-style:dashed}.player-main{max-width:720px}.player-main .course-kicker{display:flex;align-items:center;gap:10px;margin-bottom:8px}.player-main h1{font-size:30px;letter-spacing:-.02em}.player-sec-title{font-size:13px;font-family:var(--font-mono);text-transform:uppercase;letter-spacing:.08em;color:var(--accent-ink);margin:30px 0 4px}.player-nav{display:flex;justify-content:space-between;margin-top:44px;padding-top:22px;border-top:1px solid var(--line)}.sources{margin-top:26px;padding:18px;background:var(--surface-2);border:1px solid var(--line);border-radius:var(--r)}.source-link{display:flex;align-items:center;gap:8px;font-size:13.5px;color:var(--ink);padding:5px 0}.source-link a{color:var(--accent-ink);text-decoration:underline}.quiz{max-width:720px}.quiz-q{padding:22px 0;border-bottom:1px solid var(--line)}.quiz-q:last-of-type{border-bottom:none}.quiz-q-text{font-size:17px;font-weight:600;color:var(--ink-strong);margin-bottom:14px;display:flex;gap:10px}.quiz-q-num{font-family:var(--font-mono);color:var(--accent-ink);flex-shrink:0}.quiz-opt{display:flex;align-items:center;gap:12px;padding:12px 15px;border:1px solid var(--line-strong);border-radius:var(--r-sm);cursor:pointer;margin-bottom:8px;font-size:14.5px;transition:border-color .12s,background .12s}.quiz-opt:hover{border-color:var(--muted)}.quiz-opt.sel{border-color:var(--accent);background:var(--accent-wash)}.quiz-opt.correct{border-color:var(--green-ink);background:var(--green-bg)}.quiz-opt.wrong{border-color:var(--red-ink);background:var(--red-bg)}.quiz-opt input{accent-color:var(--accent);width:16px;height:16px}.quiz-expl{font-size:13.5px;color:var(--muted);margin-top:8px;padding:10px 14px;background:var(--surface-2);border-radius:var(--r-sm);border-left:2px solid var(--line-strong)}.quiz-result{text-align:center;padding:30px;background:var(--surface);border:1px solid var(--line);border-radius:var(--r-lg);margin-bottom:24px}.quiz-score{font-family:var(--font-serif);font-size:54px;line-height:1;letter-spacing:-.02em}.drawer-backdrop{position:fixed;top:0;right:0;bottom:0;left:0;background:#17141047;z-index:80;animation:fade .2s var(--ease)}@keyframes fade{0%{opacity:0}}.drawer{position:fixed;top:0;right:0;bottom:0;width:460px;max-width:94vw;background:var(--paper);border-left:1px solid var(--line);z-index:90;overflow-y:auto;animation:slidein .28s var(--ease);box-shadow:-20px 0 50px #1714101a}@keyframes slidein{0%{transform:translate(30px);opacity:.6}}.drawer-head{position:sticky;top:0;background:var(--paper);border-bottom:1px solid var(--line);padding:20px 24px;display:flex;justify-content:space-between;align-items:flex-start;z-index:2}.drawer-body{padding:24px}.drawer-close{color:var(--muted);padding:6px;border-radius:var(--r-sm)}.drawer-close:hover{background:var(--paper-2);color:var(--ink)}.modal-backdrop{position:fixed;top:0;right:0;bottom:0;left:0;background:#17141052;z-index:80;display:flex;align-items:center;justify-content:center;padding:24px;animation:fade .2s var(--ease)}.modal{width:100%;max-width:480px;background:var(--surface);border:1px solid var(--line);border-radius:var(--r-lg);box-shadow:var(--shadow-pop);overflow:hidden;animation:slideup .24s var(--ease)}@keyframes slideup{0%{transform:translateY(12px);opacity:.7}}.modal-head{padding:22px 24px 0}.modal-body{padding:20px 24px}.modal-foot{padding:16px 24px;border-top:1px solid var(--line);display:flex;justify-content:flex-end;gap:10px;background:var(--surface-2)}.toast-wrap{position:fixed;bottom:24px;left:50%;transform:translate(-50%);z-index:200;display:flex;flex-direction:column;gap:8px;align-items:center}.toast{display:flex;align-items:center;gap:10px;background:var(--ink-strong);color:#fff;padding:11px 18px;border-radius:var(--r);font-size:14px;box-shadow:var(--shadow-pop);animation:slideup .24s var(--ease)}.toast.err{background:var(--red-ink)}.kv{display:grid;grid-template-columns:auto 1fr;gap:8px 18px;font-size:14px}.kv dt{color:var(--muted)}.kv dd{color:var(--ink-strong);font-weight:500;text-align:right}.tokenbox{display:flex;align-items:center;gap:10px;background:var(--ink-strong);color:#f3efe8;font-family:var(--font-mono);font-size:13px;padding:12px 14px;border-radius:var(--r-sm);word-break:break-all}.tokenbox button{color:#f3efe8;opacity:.7}.tokenbox button:hover{opacity:1}.steps{counter-reset:step}.step{display:flex;gap:16px;padding:16px 0;border-bottom:1px solid var(--line)}.step:last-child{border-bottom:none}.step-num{counter-increment:step;width:28px;height:28px;border-radius:50%;background:var(--accent-wash);color:var(--accent-ink);font-family:var(--font-mono);font-weight:600;font-size:13px;display:flex;align-items:center;justify-content:center;flex-shrink:0}.step-num:before{content:counter(step)}@media(max-width:780px){.player{grid-template-columns:1fr}.player-side{position:static}.nav-links{display:none}}