:root{--bg:#f7f5f0;--surface:#fffefa;--ink:#17202b;--muted:#6d747d;--line:#e8e3da;--coral:#d84e3f;--coral-soft:#fbe9e5;--amber:#dc9b36;--amber-soft:#fff2d8;--teal:#3a9690;--teal-soft:#e0f2ef;--navy:#25384c;--shadow:0 14px 32px rgba(36,45,55,.07);--radius:12px}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font-family:'Noto Sans SC',sans-serif;font-size:14px;line-height:1.5}button,textarea{font:inherit}button{cursor:pointer}button:focus-visible,textarea:focus-visible{outline:3px solid rgba(216,78,63,.3);outline-offset:2px}.app-shell{display:flex;min-height:100vh}.sidebar{width:244px;background:#f1eee8;border-right:1px solid var(--line);padding:28px 16px 18px;display:flex;flex-direction:column;flex-shrink:0}.brand{display:flex;align-items:center;gap:10px;padding:0 10px 34px}.brand-mark{width:32px;height:32px;border-radius:9px;background:var(--coral);color:#fff;display:grid;place-items:center;font-family:Georgia,serif;font-size:22px;box-shadow:0 5px 12px rgba(216,78,63,.2)}.brand strong{font-size:15px;letter-spacing:.02em;display:block}.brand small{display:block;color:var(--muted);font-size:11px;margin-top:1px}.sidebar-label,.section-kicker{font-size:10px;letter-spacing:.14em;color:#8c918f;font-weight:700}.sidebar-label{padding:0 12px 10px}.chapter-nav{display:flex;flex-direction:column;gap:4px}.chapter-link{border:0;background:transparent;color:#5e666d;width:100%;padding:11px 12px;display:flex;align-items:center;gap:11px;border-radius:9px;text-align:left;transition:.2s}.chapter-link:hover{background:#e8e3dc;color:var(--ink)}.chapter-link.active{background:var(--surface);color:var(--ink);box-shadow:0 3px 10px rgba(40,44,50,.05)}.chapter-index{font-family:'Source Serif 4',serif;font-size:16px;color:#979b9a;width:24px}.chapter-link.active .chapter-index{color:var(--coral)}.chapter-link div{flex:1}.chapter-link strong{font-size:13px;display:block;font-weight:600}.chapter-link small{font-size:11px;color:#9a9d9c}.chapter-link .check{color:var(--teal);width:15px;height:15px}.sidebar-bottom{margin-top:auto}.streak-card{background:var(--navy);color:#fff;border-radius:10px;padding:12px;display:flex;align-items:center;gap:9px;margin:10px 4px 13px}.streak-icon{width:28px;height:28px;background:rgba(255,255,255,.12);border-radius:7px;display:grid;place-items:center;color:#f2b559}.streak-icon svg{width:16px}.streak-card strong{display:block;font-size:13px}.streak-card span{font-size:10px;color:#c7d0d7}.tiny-icon{width:14px;margin-left:auto;color:#a7b6bf}.settings-btn{border:0;background:transparent;color:#777d80;padding:11px 12px;display:flex;align-items:center;gap:10px;width:100%;font-size:12px}.settings-btn svg{width:16px}.main-content{flex:1;min-width:0;max-width:1540px;margin:0 auto}.topbar{height:76px;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;padding:0 clamp(24px,4vw,68px)}.breadcrumbs{display:flex;align-items:center;gap:9px;color:#959996;font-size:12px}.breadcrumbs svg{width:14px}.breadcrumbs strong{color:#4b5359;font-weight:600}.top-actions{display:flex;align-items:center;gap:14px}.icon-btn{border:1px solid var(--line);background:var(--surface);border-radius:8px;width:34px;height:34px;display:grid;place-items:center;color:#737b7d;transition:.2s}.icon-btn:hover{border-color:#cdc5ba;color:var(--ink);transform:translateY(-1px)}.icon-btn svg{width:16px}.icon-btn.small{border:0;background:transparent}.avatar{width:32px;height:32px;border-radius:50%;background:#e5b478;color:#5b3c23;border:2px solid #fff;font-weight:700}.hero-section{margin:0 clamp(24px,4vw,68px);padding:48px 0 45px;display:flex;justify-content:space-between;gap:30px;min-height:300px}.hero-copy{max-width:620px;position:relative;z-index:1}.eyebrow{color:var(--coral);font-weight:700;font-size:11px;letter-spacing:.08em;display:flex;align-items:center;gap:8px}.eyebrow-dot{width:7px;height:7px;border-radius:50%;background:var(--coral);box-shadow:0 0 0 4px var(--coral-soft)}h1,h2,h3{font-family:'Source Serif 4',Georgia,serif;letter-spacing:-.02em;margin:0}.hero-copy h1{font-size:clamp(30px,3.3vw,48px);line-height:1.16;margin:17px 0 13px;max-width:620px}.hero-copy p{color:#687076;max-width:535px;font-size:14px;margin:0;line-height:1.8}.hero-actions{display:flex;gap:10px;margin-top:26px}.primary-btn,.secondary-btn,.outline-wide{border:0;border-radius:7px;min-height:42px;padding:0 16px;display:inline-flex;align-items:center;justify-content:center;gap:8px;font-weight:600;font-size:12px;transition:.2s}.primary-btn{background:var(--coral);color:#fff;box-shadow:0 8px 16px rgba(216,78,63,.18)}.primary-btn:hover{background:#bd4033;transform:translateY(-1px)}.secondary-btn{background:transparent;border:1px solid #ded8cf;color:#626b70}.secondary-btn:hover{background:#fffefa}.primary-btn svg,.secondary-btn svg{width:15px}.hero-visual{height:220px;width:290px;position:relative;margin:6px 7% 0 0;opacity:.88}.grid-lines{position:absolute;inset:7px 10px;background-image:linear-gradient(#e6e3db 1px,transparent 1px),linear-gradient(90deg,#e6e3db 1px,transparent 1px);background-size:29px 29px;transform:perspective(250px) rotateX(13deg);transform-origin:center bottom}.axis{position:absolute;background:#aab1ae}.axis-x{left:0;right:0;top:113px;height:1px}.axis-y{top:0;bottom:0;left:137px;width:1px}.curve{position:absolute}.curve-line{width:245px;height:112px;left:14px;top:45px;border-top:2px solid var(--coral);transform:rotate(-21deg);border-radius:50%}.curve-circle{width:105px;height:105px;border:2px solid var(--teal);border-radius:50%;left:91px;top:64px;opacity:.8}.point{position:absolute;width:20px;height:20px;display:grid;place-items:center;border-radius:50%;font-size:11px;font-weight:700}.point-a{background:var(--coral-soft);color:var(--coral);left:46px;top:65px}.point-b{background:var(--teal-soft);color:var(--teal);right:30px;top:123px}.visual-label{position:absolute;right:0;top:25px;font:600 12px 'Source Serif 4',serif;color:#7f8784;transform:rotate(-8deg)}.stats-row{margin:0 clamp(24px,4vw,68px) 39px;display:grid;grid-template-columns:1.1fr 1.1fr 1.2fr 1fr;gap:12px}.stat-card{position:relative;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:17px 18px;min-height:122px}.stat-label{font-size:11px;color:#8c9290;display:block;margin-bottom:8px}.stat-card strong{font-family:'Source Serif 4',serif;font-size:25px;display:block;line-height:1.1}.stat-card small{font-size:10px;color:#9a9d9b;display:block;margin-top:7px}.stat-card small b{color:var(--teal);font-weight:600}.progress-track{height:5px;border-radius:10px;background:#f0e5df;margin-top:12px;overflow:hidden}.progress-track span{display:block;height:100%;border-radius:inherit;background:var(--coral);transition:width .35s}.progress-track.amber{background:#f5eddc}.progress-track.amber span{background:var(--amber)}.focus-stat{overflow:hidden}.mini-bars{position:absolute;right:17px;bottom:17px;height:36px;display:flex;align-items:end;gap:4px}.mini-bars i{width:5px;background:#d9e7e3;border-radius:3px 3px 1px 1px}.mini-bars i.today{background:var(--teal)}.next-stat strong{font-size:20px}.next-lock{position:absolute;right:18px;top:18px;width:15px;color:#b8bab7}.content-grid{margin:0 clamp(24px,4vw,68px);display:grid;grid-template-columns:minmax(0,1.42fr) minmax(290px,.78fr);gap:34px}.section-heading{display:flex;align-items:end;justify-content:space-between;margin-bottom:19px}.section-heading h2{font-size:25px;margin-top:5px}.text-btn{border:0;background:transparent;color:var(--coral);font-size:12px;font-weight:600;display:inline-flex;align-items:center;gap:5px;padding:5px 0}.text-btn svg{width:14px}.chapter-intro{border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:15px 0;display:flex;gap:14px;align-items:center;margin-bottom:14px}.chapter-number{font-family:'Source Serif 4',serif;font-size:35px;line-height:1;color:#d2cdc4;width:58px}.chapter-intro p{margin:0;color:#697176;font-size:12px}.tag-row{display:flex;gap:7px;margin-top:8px}.tag{font-size:10px;color:#7f8583;background:#f1eee8;padding:3px 8px;border-radius:4px}.tag.soft{background:var(--teal-soft);color:#43847f}.lesson-list{display:flex;flex-direction:column}.lesson-item{display:grid;grid-template-columns:32px minmax(0,1fr) auto;align-items:center;gap:12px;padding:14px 10px;border-bottom:1px solid var(--line);transition:.2s}.lesson-item:hover{background:rgba(255,254,250,.55)}.lesson-item.complete .lesson-title{color:#89918f;text-decoration:line-through;text-decoration-color:#c3d5d0}.lesson-check{width:22px;height:22px;border-radius:50%;border:1.5px solid #c6cbc7;background:transparent;color:transparent;display:grid;place-items:center;transition:.2s}.lesson-check svg{width:13px}.lesson-item.complete .lesson-check{border-color:var(--teal);background:var(--teal);color:#fff}.lesson-title{font-size:13px;font-weight:600;display:block}.lesson-subtitle{font-size:11px;color:#939997;display:block;margin-top:3px}.lesson-meta{font-size:10px;color:#a0a4a1;display:flex;align-items:center;gap:10px;white-space:nowrap}.lesson-meta svg{width:13px}.right-column{display:flex;flex-direction:column;gap:14px}.panel{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:19px}.panel-heading{display:flex;align-items:start;justify-content:space-between}.panel-heading h3{font-size:20px;margin-top:4px}.rhythm-list{margin:18px 0 17px}.rhythm-item{display:grid;grid-template-columns:48px 1fr 8px;gap:10px;align-items:center;padding:9px 0;border-bottom:1px dashed #ebe7df}.rhythm-item:last-child{border:0}.rhythm-time{font-size:10px;color:#a0a5a3;font-variant-numeric:tabular-nums}.rhythm-item strong{font-size:12px;display:block}.rhythm-item small{font-size:10px;color:#989e9d}.rhythm-dot{width:7px;height:7px;border-radius:50%}.rhythm-dot.coral{background:var(--coral)}.rhythm-dot.amber{background:var(--amber)}.rhythm-dot.teal{background:var(--teal)}.rhythm-dot.ink{background:var(--navy)}.outline-wide{width:100%;background:transparent;border:1px solid #dcd5cc;color:#5e6669}.outline-wide:hover{border-color:var(--coral);color:var(--coral);background:#fffaf7}.outline-wide svg{width:15px}.question-count{font-size:11px;color:#9ca19e;font-variant-numeric:tabular-nums}.quiz-body{padding:17px 0 12px;border-bottom:1px solid var(--line)}.quiz-type{font-size:10px;color:var(--coral);font-weight:700;letter-spacing:.05em;margin:0 0 8px}.quiz-question{font-family:'Source Serif 4',serif;font-size:16px;line-height:1.55;margin:0 0 13px}.options{display:grid;grid-template-columns:1fr 1fr;gap:7px}.option-btn{border:1px solid #e7e2da;background:#fffefa;color:#5f686b;text-align:left;border-radius:6px;padding:8px 10px;font-size:12px;transition:.2s}.option-btn:hover{border-color:#cfc6bb;background:#fffcf7}.option-btn.correct{border-color:#7db4ad;background:var(--teal-soft);color:#317c75}.option-btn.wrong{border-color:#e6a398;background:var(--coral-soft);color:#b4473b}.option-btn:disabled{cursor:default}.quiz-feedback{font-size:11px;line-height:1.6;margin-top:10px;padding:8px 10px;border-radius:5px;background:#f5f3ef;color:#636a69}.quiz-footer{padding-top:12px;display:flex;justify-content:space-between;align-items:center}.quiz-footer>span{color:#9b9f9d;font-size:10px}.notebook-panel textarea{width:100%;height:88px;border:0;resize:vertical;background:#faf8f3;padding:11px;border-radius:6px;color:#4b555a;font-size:12px;line-height:1.7;margin-top:13px}.notebook-panel textarea::placeholder{color:#aaaead}.note-meta{display:flex;justify-content:space-between;color:#a1a5a3;font-size:10px;margin-top:8px}.note-meta span:first-child{display:flex;gap:4px;align-items:center}.note-meta svg{width:12px}.panel-icon{color:#aaafac;width:16px}.footer{margin:66px clamp(24px,4vw,68px) 28px;padding-top:15px;border-top:1px solid var(--line);display:flex;justify-content:space-between;font-size:10px;color:#a1a5a3}.toast{position:fixed;bottom:24px;left:50%;transform:translate(-50%,20px);background:var(--navy);color:#fff;padding:10px 16px;border-radius:7px;font-size:12px;opacity:0;pointer-events:none;transition:.25s;z-index:20}.toast.show{opacity:1;transform:translate(-50%,0)}.modal-backdrop{position:fixed;inset:0;background:rgba(23,32,43,.35);display:grid;place-items:center;padding:20px;z-index:10}.modal-backdrop[hidden]{display:none}.modal{background:var(--surface);border-radius:14px;max-width:550px;width:100%;padding:30px;position:relative;box-shadow:0 24px 60px rgba(23,32,43,.2)}.modal-close{position:absolute;right:18px;top:18px}.modal h2{font-size:27px;margin-top:7px}.modal-lead{color:#727978;font-size:12px;margin:10px 0 21px}.modal-timeline{display:grid;gap:10px}.modal-step{display:grid;grid-template-columns:56px 1fr;gap:13px;align-items:start;padding:12px 0;border-top:1px solid var(--line)}.modal-step time{font:600 13px 'Source Serif 4',serif;color:var(--coral)}.modal-step strong{font-size:12px;display:block}.modal-step p{font-size:11px;color:#858c89;margin:3px 0 0}
@media (max-width:1000px){.sidebar{width:205px}.stats-row{grid-template-columns:1fr 1fr}.next-stat{display:none}.content-grid{grid-template-columns:1fr}.right-column{display:grid;grid-template-columns:1fr 1fr}.notebook-panel{grid-column:span 2}.hero-visual{margin-right:0}}
@media (max-width:680px){.sidebar{width:62px;padding:20px 8px}.brand{padding:0 7px 27px}.brand>div,.sidebar-label,.chapter-link div,.chapter-link .check,.sidebar-bottom{display:none}.chapter-link{justify-content:center;padding:12px 0}.chapter-index{width:auto}.main-content{width:calc(100% - 62px)}.topbar{height:60px;padding:0 16px}.breadcrumbs span,.breadcrumbs svg{display:none}.breadcrumbs strong{font-size:11px}.hero-section{padding:32px 0 29px;margin:0 18px;min-height:0}.hero-copy h1{font-size:31px}.hero-copy p{font-size:13px}.hero-visual{display:none}.hero-actions{flex-wrap:wrap}.stats-row{margin:0 18px 30px;grid-template-columns:1fr 1fr;gap:8px}.stat-card{padding:13px;min-height:112px}.stat-card strong{font-size:21px}.focus-stat{display:none}.content-grid{margin:0 18px;display:block}.section-heading h2{font-size:21px}.right-column{display:flex;margin-top:28px}.notebook-panel{grid-column:auto}.footer{margin:46px 18px 22px;display:block;line-height:2}.footer span{display:block}.chapter-intro{align-items:start}.lesson-item{grid-template-columns:27px minmax(0,1fr);gap:9px}.lesson-meta{grid-column:2}.modal{padding:24px 20px}.options{grid-template-columns:1fr}}
@media (prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}