:root{--bg:#fafaf7;--surface:#fff;--surface-soft:#f4f2ec;--surface-mute:#f9f8f3;--text-primary:#1f1f1c;--text-secondary:#5f5e5a;--text-tertiary:#888780;--border:#e5e3db;--border-strong:#c9c7be;--accent:#534ab7;--accent-bg:#eeedfe;--accent-soft:#f5f4fe;--success:#0f6e56;--success-bg:#e1f5ee;--warn:#b0671a;--warn-bg:#fcedd8;--rose:#b14a6f;--rose-bg:#fbe7ee;--teal:#2e7b7b;--teal-bg:#dcefef;--radius-sm:8px;--radius-md:12px;--radius-lg:16px;--shadow-card:0 1px 2px #0000000a;--shadow-float:0 8px 32px #0000002e}*{box-sizing:border-box}html{scroll-behavior:smooth}body{background:var(--bg);color:var(--text-primary);-webkit-font-smoothing:antialiased;margin:0;font-family:Inter,PingFang SC,Hiragino Sans GB,Microsoft YaHei,system-ui,sans-serif;font-size:14px;line-height:1.65}button,textarea{font:inherit}button{cursor:pointer;background:0 0;border:0}button:disabled{cursor:not-allowed;opacity:.55}a{color:inherit;text-decoration:none}.nav{z-index:50;border-bottom:.5px solid var(--border);-webkit-backdrop-filter:saturate(180%)blur(12px);backdrop-filter:saturate(180%)blur(12px);background:#fafaf7eb;position:sticky;top:0}.nav-inner{justify-content:space-between;align-items:center;gap:16px;max-width:1100px;margin:0 auto;padding:14px 24px;display:flex}.nav-brand{align-items:center;gap:10px;display:flex}.brand-mark{color:#fff;background:linear-gradient(135deg,#534ab7,#7c6be0);border-radius:7px;place-items:center;width:30px;height:30px;font-size:12px;font-weight:800;display:grid}.nav-brand-name{letter-spacing:0;font-size:16px;font-weight:700}.nav-brand-tag{letter-spacing:.14em;text-transform:uppercase;color:var(--accent);font-size:10px;font-weight:700}.nav-right{align-items:center;gap:12px;display:flex}.notif-btn{width:34px;height:34px;color:var(--text-secondary);border-radius:8px;place-items:center;display:grid;position:relative}.notif-btn:hover{background:var(--surface-soft);color:var(--text-primary)}.notif-dot{border:2px solid var(--bg);background:#d85b5b;border-radius:50%;width:6px;height:6px;position:absolute;top:7px;right:8px}.avatar{color:#fff;background:linear-gradient(135deg,#534ab7,#9e8fed);border-radius:50%;place-items:center;width:32px;height:32px;font-size:12px;font-weight:700;display:grid}.page{grid-template-columns:200px 1fr;gap:32px;max-width:1100px;margin:0 auto;padding:24px 24px 80px;display:grid}.timeline{align-self:start;max-height:calc(100vh - 100px);padding-top:8px;padding-right:8px;position:sticky;top:88px;overflow-y:auto}.timeline-head{color:var(--text-tertiary);letter-spacing:.06em;text-transform:uppercase;margin-bottom:14px;padding-left:6px;font-size:11px;font-weight:700}.timeline-list{flex-direction:column;display:flex;position:relative}.timeline-list:before{content:"";background:var(--border);width:1.5px;position:absolute;top:14px;bottom:14px;left:14px}.timeline-item{color:var(--text-secondary);border-radius:7px;align-items:center;gap:10px;padding:7px 6px;font-size:12.5px;font-weight:600;transition:background .15s;display:flex;position:relative}.timeline-item:hover{background:var(--surface-soft)}.timeline-item.current{color:var(--accent);font-weight:700}.timeline-item.locked{color:var(--text-tertiary)}.timeline-item.open{color:var(--text-secondary)}.timeline-item.seen{color:var(--accent);font-weight:700}.timeline-dot{background:var(--surface);border:1.5px solid var(--border);z-index:1;width:20px;height:20px;color:var(--text-tertiary);border-radius:50%;flex-shrink:0;place-items:center;font-size:10px;font-weight:700;display:grid;position:relative}.timeline-item.done .timeline-dot{background:var(--success);border-color:var(--success);color:#fff}.timeline-item.current .timeline-dot{background:var(--accent);border-color:var(--accent);color:#fff;box-shadow:0 0 0 3px var(--accent-soft)}.timeline-item.seen .timeline-dot{background:var(--accent);border-color:var(--accent);color:#fff}.timeline-item.locked,.timeline-item.locked.current,.timeline-item.locked.seen{color:var(--text-tertiary);font-weight:600}.timeline-item.locked .timeline-dot,.timeline-item.locked.current .timeline-dot,.timeline-item.locked.seen .timeline-dot{background:var(--surface-soft);border-color:var(--border);color:var(--text-tertiary);box-shadow:none}.main{min-width:0}.breadcrumb{color:var(--text-tertiary);flex-wrap:wrap;align-items:center;gap:6px;margin-bottom:14px;font-size:12.5px;display:flex}.breadcrumb .current{color:var(--text-secondary);font-weight:600}.lesson-header{margin-bottom:24px}.lesson-eyebrow{color:var(--accent);letter-spacing:.06em;text-transform:uppercase;align-items:center;gap:6px;margin-bottom:6px;font-size:11px;font-weight:700;display:flex}.lesson-title{letter-spacing:0;color:var(--text-primary);margin:0 0 8px;font-size:26px;font-weight:700;line-height:1.2}.lesson-meta{color:var(--text-secondary);flex-wrap:wrap;align-items:center;gap:14px;font-size:12.5px;display:flex}.lesson-meta span,.quiz-foot span{align-items:center;gap:5px;display:inline-flex}.overall-progress{background:var(--accent-soft);border-radius:var(--radius-md);border:.5px solid #ddd9f2;align-items:center;gap:12px;margin-top:14px;padding:12px 14px;display:flex}.progress-track{background:#534ab726;border-radius:99px;flex:1;height:6px;overflow:hidden}.progress-fill{background:var(--accent);border-radius:99px;height:100%;transition:width .4s}.overall-progress span{color:var(--accent);font-variant-numeric:tabular-nums;font-size:12.5px;font-weight:700}.modules{flex-direction:column;gap:14px;display:flex}.module-card{background:var(--surface);border:.5px solid var(--border);border-radius:var(--radius-lg);scroll-margin-top:88px;transition:all .2s;overflow:hidden}.module-card.done{background:linear-gradient(#fbfefd 0%,#fff 100%);border-color:#c8e5d8}.module-card.current{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-soft), var(--shadow-card)}.module-card.locked{opacity:.66}.module-card.open{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-soft), var(--shadow-card)}.module-card:not(.seen) .module-icon-wrap{background:var(--surface-soft);color:var(--text-tertiary)}.module-card:not(.seen) .module-num{background:var(--surface-mute);color:var(--text-tertiary)}.module-card:not(.seen) .module-title{color:var(--text-secondary)}.module-card:not(.seen) .module-tag{color:var(--text-tertiary)}.module-card.seen .module-num{background:var(--accent);color:#fff}.module-card.seen .module-tag{color:var(--accent)}.module-head{cursor:pointer;-webkit-user-select:none;user-select:none;align-items:center;gap:14px;padding:18px 22px;display:flex}.module-head:hover{background:var(--surface-mute)}.module-chevron{color:var(--text-tertiary);flex-shrink:0;transition:transform .2s,color .2s}.module-card.open .module-chevron{color:var(--accent);transform:rotate(180deg)}.module-num{background:var(--surface-soft);width:32px;height:32px;color:var(--text-secondary);border-radius:9px;flex-shrink:0;place-items:center;font-size:13px;font-weight:700;display:grid}.module-card.done .module-num{background:var(--success);color:#fff}.module-card.current .module-num{background:var(--accent);color:#fff}.module-icon-wrap{border-radius:9px;flex-shrink:0;place-items:center;width:34px;height:34px;display:grid}.module-icon-wrap.acc{background:var(--accent-bg);color:var(--accent)}.module-icon-wrap.warn{background:var(--warn-bg);color:var(--warn)}.module-icon-wrap.rose{background:var(--rose-bg);color:var(--rose)}.module-icon-wrap.teal{background:var(--teal-bg);color:var(--teal)}.module-icon-wrap.success{background:var(--success-bg);color:var(--success)}.module-icon-wrap.mute{background:var(--surface-soft);color:var(--text-secondary)}.module-info{flex:1;min-width:0}.module-tag{color:var(--text-tertiary);letter-spacing:.06em;text-transform:uppercase;margin-bottom:2px;font-size:10.5px;font-weight:700}.module-card.current .module-tag{color:var(--accent)}.module-card.done .module-tag{color:var(--success)}.module-title{letter-spacing:0;color:var(--text-primary);font-size:15.5px;font-weight:700}.module-status-pill{letter-spacing:.04em;text-transform:uppercase;border-radius:99px;flex-shrink:0;align-items:center;gap:4px;padding:4px 9px;font-size:11px;font-weight:700;display:inline-flex}.module-status-pill.done{background:var(--success-bg);color:var(--success)}.module-status-pill.current{background:var(--accent-bg);color:var(--accent)}.module-status-pill.locked{background:var(--surface-soft);color:var(--text-tertiary)}.module-status-pill.open{background:var(--surface-soft);color:var(--text-secondary)}.module-body{border-top:.5px solid var(--border);padding:18px 22px 22px;display:none}.module-card.open .module-body{display:block}.lead{color:var(--text-secondary);margin:0 0 14px;font-size:14px;line-height:1.7}.welcome-blocks{grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:10px;margin-bottom:14px;display:grid}.welcome-lines{background:var(--surface-mute);border:.5px solid var(--border);border-radius:var(--radius-md);color:var(--text-secondary);margin:0 0 14px;padding:12px 16px 12px 34px;font-size:13.5px;line-height:1.65}.welcome-lines li+li{margin-top:6px}.welcome-block{background:var(--surface-mute);border:.5px solid var(--border);border-radius:var(--radius-sm);padding:12px 14px}.welcome-block-head{color:var(--text-tertiary);letter-spacing:.04em;text-transform:uppercase;margin-bottom:4px;font-size:11px;font-weight:700}.welcome-block-body{color:var(--text-primary);font-size:13px;font-weight:600;line-height:1.45}.story-frame{border-radius:var(--radius-md);aspect-ratio:16/9;color:#fff;background:#1f1f1c;place-items:center;margin-bottom:14px;display:grid;position:relative;overflow:hidden}.story-frame:before{content:"";opacity:.7;background:radial-gradient(circle,#534ab74d 0%,#0000 60%);position:absolute;inset:0}.story-frame.playing:before{background:linear-gradient(135deg,#534ab773,#14141238)}.story-frame.playing .story-media{z-index:2;background:#000;border:0;width:100%;height:100%;display:block;position:absolute;inset:0;box-shadow:inset 0 0 0 1px #ffffff1f}.play-button{opacity:.72;transform:scale(.86)}.story-media{z-index:2;background:#000;border:0;width:100%;height:100%;display:block;position:absolute;inset:0}.story-frame.playing .story-media{box-shadow:inset 0 0 0 1px #ffffff1f}.story-overlay{z-index:3;cursor:pointer;background:#1414124d;place-items:center;display:grid;position:absolute;inset:0}.play-button{width:64px;height:64px;color:var(--accent);z-index:1;background:#fffffff2;border-radius:50%;place-items:center;display:grid;position:relative;box-shadow:0 8px 24px #0006}.story-meta{z-index:1;justify-content:space-between;align-items:flex-end;gap:12px;font-size:12px;display:flex;position:absolute;bottom:14px;left:16px;right:16px}.story-meta-name{font-size:13.5px;font-weight:700}.sw-cta{border-radius:var(--radius-md);color:#fff;background:linear-gradient(135deg,#1f1f1c 0%,#2a2a28 100%);align-items:center;gap:18px;margin-bottom:14px;padding:22px;display:flex}.sw-cta-icon{color:#9e8fed;background:#7c6be033;border:1px solid #7c6be04d;border-radius:13px;flex-shrink:0;place-items:center;width:54px;height:54px;display:grid}.sw-cta-body{flex:1;min-width:0}.sw-cta-title{margin-bottom:3px;font-size:15px;font-weight:700}.sw-cta-sub{opacity:.78;font-size:12.5px;line-height:1.5}.sw-cta-actions,.btn-row,.badge-actions{flex-wrap:wrap;gap:8px;display:flex}.sw-pill,.play-launch,.btn{border-radius:8px;justify-content:center;align-items:center;gap:6px;font-size:13px;font-weight:700;transition:all .15s;display:inline-flex}.sw-pill{padding:8px 14px}.sw-pill.primary{color:var(--text-primary);background:#fff}.sw-pill.ghost{color:#fff;background:#ffffff14;border:.5px solid #fff3}.kl-card{background:var(--accent-soft);border-radius:var(--radius-md);border:.5px solid #ddd9f2;margin-bottom:14px;padding:18px}.kl-head{color:var(--accent);letter-spacing:.04em;text-transform:uppercase;align-items:center;gap:8px;margin-bottom:8px;font-size:12px;font-weight:700;display:flex}.kl-title{color:var(--text-primary);margin-bottom:6px;font-size:15px;font-weight:700}.kl-body{color:var(--text-secondary);font-size:13.5px;line-height:1.65}.note-pad{resize:vertical;border-radius:var(--radius-md);width:100%;min-height:180px;color:var(--text-primary);background:#fffcf4;border:.5px solid #f0e4c8;margin-bottom:14px;padding:16px 18px;line-height:1.7}.note-pad:focus{outline:2px solid #f0d798}.spark-grid{grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:10px;margin-bottom:14px;display:grid}.spark-card{text-align:left;background:var(--surface-mute);border:.5px solid var(--border);border-radius:var(--radius-md);flex-direction:column;gap:6px;padding:14px;transition:all .15s;display:flex}.spark-card:hover,.spark-card.selected{border-color:var(--accent);background:var(--accent-soft);transform:translateY(-1px)}.spark-card.own{border-color:var(--accent);background:var(--accent-soft)}.spark-card.own .spark-card-head{color:var(--accent)}.spark-card-head{color:var(--rose);align-items:center;display:flex}.spark-card-q{color:var(--text-primary);font-size:13px;font-weight:600;line-height:1.4}.spark-input{background:var(--surface-mute);border:.5px solid var(--border);border-radius:var(--radius-md);margin-bottom:14px;padding:14px}.spark-input-label{color:var(--text-tertiary);letter-spacing:.04em;text-transform:uppercase;align-items:center;gap:6px;margin-bottom:8px;font-size:11px;font-weight:700;display:flex}.spark-input-row{gap:8px;display:flex}.spark-text{background:var(--surface);border:.5px solid var(--border);border-radius:var(--radius-sm);min-width:0;color:var(--text-primary);flex:1;padding:10px 12px;font-size:13.5px}.spark-text:focus{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-soft);outline:none}.submitted-spark{background:var(--accent-soft);border-radius:var(--radius-md);border:.5px solid #ddd9f2;margin-bottom:14px;padding:14px}.submitted-spark-label{color:var(--accent);letter-spacing:.04em;text-transform:uppercase;align-items:center;gap:6px;margin-bottom:8px;font-size:12px;font-weight:700;display:flex}.submitted-spark pre{white-space:pre-wrap;color:var(--text-primary);margin:0;font-family:inherit;font-size:13.5px;line-height:1.65}.play-frame-wrap{background:var(--surface);border:.5px solid var(--border);border-radius:var(--radius-md);margin-bottom:14px;overflow:hidden}.play-frame{background:#fff;border:0;width:100%;height:min(64vh,560px);min-height:360px;display:block}.play-canvas{border-radius:var(--radius-md);text-align:center;background:linear-gradient(135deg,#f5f4fe 0%,#fcfbff 100%);border:1px dashed #c9c0f2;flex-direction:column;justify-content:center;align-items:center;min-height:200px;margin-bottom:14px;padding:30px;display:flex}.play-icon{background:var(--accent);color:#fff;border-radius:13px;place-items:center;width:54px;height:54px;margin-bottom:10px;display:grid;box-shadow:0 4px 12px #534ab74d}.play-title{color:var(--text-primary);margin-bottom:4px;font-size:15px;font-weight:700}.play-sub{color:var(--text-secondary);max-width:380px;margin-bottom:14px;font-size:13px}.play-launch{background:var(--accent);color:#fff;padding:9px 18px}.quiz-block+.quiz-block{margin-top:18px}.quiz-q{color:var(--text-primary);margin-bottom:14px;font-size:14.5px;font-weight:700}.quiz-options{flex-direction:column;gap:8px;margin-bottom:14px;display:flex}.quiz-option{background:var(--surface);border:.5px solid var(--border);border-radius:var(--radius-sm);width:100%;color:var(--text-primary);text-align:left;align-items:center;gap:10px;padding:12px 14px;font-size:13.5px;transition:all .15s;display:flex}.quiz-option:hover{border-color:var(--border-strong);background:var(--surface-mute)}.quiz-option .opt-letter{background:var(--surface-soft);width:22px;height:22px;color:var(--text-secondary);border-radius:5px;flex-shrink:0;place-items:center;font-size:11.5px;font-weight:700;display:grid}.quiz-option.selected{border-color:var(--accent);background:var(--accent-soft)}.quiz-option.selected .opt-letter{background:var(--accent);color:#fff}.quiz-foot{color:var(--text-tertiary);border-top:.5px solid var(--border);justify-content:space-between;align-items:center;gap:12px;padding-top:10px;font-size:12px;display:flex}.quiz-modal-backdrop{z-index:100;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);background:#1f1f1c8c;justify-content:center;align-items:center;padding:20px;display:flex;position:fixed;inset:0}.quiz-modal{background:var(--surface);border:.5px solid var(--border);border-radius:var(--radius-lg);box-shadow:var(--shadow-float);text-align:center;width:100%;max-width:420px;padding:26px 22px 22px;position:relative}.quiz-modal-close{border:.5px solid var(--border);background:var(--surface);width:30px;height:30px;color:var(--text-tertiary);cursor:pointer;border-radius:999px;place-items:center;transition:all .15s;display:grid;position:absolute;top:10px;right:10px}.quiz-modal-close:hover{background:var(--surface-soft);color:var(--text-primary);border-color:var(--border-strong)}.quiz-modal-icon{background:var(--warn-bg);width:56px;height:56px;color:var(--warn);border-radius:999px;place-items:center;margin:0 auto 10px;display:grid}.quiz-modal-title{color:var(--text-primary);margin-bottom:12px;font-size:15px;font-weight:700}.quiz-modal-score{color:var(--text-secondary);margin-bottom:6px;font-size:13px}.quiz-modal-score .score-num{color:var(--text-primary);font-variant-numeric:tabular-nums;font-size:42px;font-weight:700;line-height:1}.quiz-modal-score .score-denom{color:var(--text-tertiary);font-size:22px}.quiz-modal-status{border-radius:999px;margin-bottom:4px;padding:3px 10px;font-size:12.5px;font-weight:700;display:inline-block}.quiz-modal-status.pass{background:var(--success-bg);color:var(--success)}.quiz-modal-status.fail{background:var(--warn-bg);color:var(--warn)}.quiz-modal-pct{color:var(--text-secondary);margin-bottom:10px;font-size:13px}.quiz-modal-note{color:var(--text-tertiary);max-width:300px;margin:0 auto;font-size:12px;line-height:1.5}.quiz-modal-actions{flex-wrap:wrap;justify-content:center;gap:8px;margin-top:18px;display:flex}.badge-card{border-radius:var(--radius-md);text-align:center;background:linear-gradient(135deg,#fffcf4 0%,#fff6e0 50%,#ffedc4 100%);border:.5px solid #f0d798;margin-bottom:14px;padding:30px}.badge-medal{color:#fff;background:radial-gradient(circle at 30% 30%,#ffe08a,#d6a53a);border-radius:50%;place-items:center;width:78px;height:78px;margin:0 auto 14px;display:grid;box-shadow:0 8px 24px #b0671a59,inset 0 -3px 8px #b0671a66}.badge-title{color:var(--text-primary);margin-bottom:4px;font-size:18px;font-weight:700}.badge-sub{color:var(--text-secondary);margin-bottom:18px;font-size:13px}.badge-actions{justify-content:center}.feedback-box{background:var(--surface-mute);border:.5px solid var(--border);border-radius:var(--radius-md);padding:16px}.feedback-label{color:var(--text-primary);align-items:center;gap:7px;margin-bottom:10px;font-size:13px;font-weight:700;display:flex}.feedback-label svg{color:var(--accent)}.feedback-field{position:relative}.feedback-input{resize:vertical;background:var(--surface);border:.5px solid var(--border);border-radius:var(--radius-sm);width:100%;min-height:88px;color:var(--text-primary);padding:11px 13px 54px;font-size:13.5px;line-height:1.6}.feedback-input:focus{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-soft);outline:none}.feedback-submit{background:var(--accent);color:#fff;border:.5px solid #0000;border-radius:8px;align-items:center;gap:6px;padding:9px 16px;font-size:13px;font-weight:700;transition:all .15s;display:inline-flex;position:absolute;bottom:10px;right:10px}.feedback-submit:hover{background:#433aa5;transform:translateY(-1px);box-shadow:0 4px 12px #534ab740}.feedback-done{color:var(--success);align-items:center;gap:8px;padding:6px 0;font-size:13.5px;font-weight:700;display:flex}.lesson-foot{justify-content:flex-end;margin-top:16px;display:flex}.module-actions{border-top:.5px dashed var(--border);flex-wrap:wrap;justify-content:space-between;align-items:center;gap:10px;padding-top:16px;display:flex}.module-actions.actions-only,.module-actions.actions-only .btn-row{justify-content:flex-end}.module-action-info{color:var(--text-tertiary);align-items:center;gap:5px;font-size:12px;display:flex}.btn{border:.5px solid #0000;padding:9px 16px}.btn-primary{background:var(--accent);color:#fff}.btn-primary:hover,.play-launch:hover{background:#433aa5;transform:translateY(-1px);box-shadow:0 4px 12px #534ab740}.btn-ghost{color:var(--text-secondary);border-color:var(--border);background:0 0}.btn-ghost:hover{background:var(--surface-soft);color:var(--text-primary)}.btn-success{background:var(--success);color:#fff}@media (max-width:880px){.page{grid-template-columns:1fr;gap:0}.timeline{display:none}}@media (max-width:640px){.nav-inner,.page{padding-left:16px;padding-right:16px}.lesson-title{font-size:23px}.module-head{align-items:flex-start;gap:10px;padding:16px}.module-status-pill{display:none}.module-body{padding:16px}.overall-progress,.sw-cta,.module-actions{flex-direction:column;align-items:stretch}.sw-cta-actions,.btn-row,.quiz-modal-actions{width:100%}.sw-pill,.btn{flex:1}}.vlesson{align-items:stretch;gap:10px;margin-bottom:12px;display:flex}.vlesson-nav{background:var(--surface-mute);border:.5px solid var(--border);border-radius:var(--radius-md);width:42px;color:var(--text-tertiary);flex-direction:column;flex-shrink:0;justify-content:center;align-items:center;gap:4px;transition:all .15s;display:flex}.vlesson-nav:hover:not(:disabled){background:var(--accent-soft);color:var(--accent);border-color:#ddd9f2}.vlesson-nav:disabled{cursor:not-allowed;opacity:.45}.vlesson-nav span{letter-spacing:.04em;text-transform:uppercase;font-size:9px;font-weight:700}.vlesson .story-frame{flex:1;margin-bottom:0}.vlesson-chapters{flex-wrap:wrap;gap:6px;margin-bottom:14px;display:flex}.chapter-pill{color:var(--text-secondary);background:var(--surface-mute);border:.5px solid var(--border);border-radius:99px;align-items:center;gap:6px;padding:5px 11px;font-size:11.5px;transition:all .15s;display:inline-flex}.chapter-pill:hover{border-color:var(--accent);color:var(--accent)}.chapter-pill.active{background:var(--accent-bg);color:var(--accent);border-color:#ddd9f2;font-weight:700}.chapter-pill span{color:var(--text-tertiary);font-variant-numeric:tabular-nums}@media (max-width:640px){.vlesson{gap:6px}.vlesson-nav{width:34px}.vlesson-nav span{display:none}}.product-grid{grid-template-columns:minmax(0,1.2fr) minmax(260px,.8fr);gap:14px;margin-bottom:14px;display:grid}.product-video{min-height:260px;margin-bottom:0}.product-video .pv-tag{z-index:4;color:var(--teal);background:#ffffffeb;border:.5px solid #2e7b7b33;border-radius:999px;padding:5px 10px;font-size:11px;font-weight:700;position:absolute;top:12px;left:12px}.spec-card{background:var(--surface-mute);border:.5px solid var(--border);border-radius:var(--radius-md);padding:16px}.spec-card-head{color:var(--teal);letter-spacing:.04em;text-transform:uppercase;align-items:center;gap:7px;margin-bottom:12px;font-size:12px;font-weight:700;display:flex}.spec-list{flex-direction:column;gap:10px;margin:0;padding:0;list-style:none;display:flex}.spec-list li{color:var(--text-secondary);gap:9px;font-size:13px;line-height:1.45;display:flex}.spec-list b{color:var(--text-primary)}.spec-dot{background:var(--teal);width:8px;height:8px;box-shadow:0 0 0 3px var(--teal-bg);border-radius:50%;flex-shrink:0;margin-top:6px}.product-frame-wrap{background:var(--surface);border:.5px solid var(--border);border-radius:var(--radius-md);margin-bottom:14px;overflow:hidden}.product-frame{background:#fff;border:0;width:100%;height:min(62vh,540px);min-height:340px;display:block}@media (max-width:760px){.product-grid{grid-template-columns:1fr}.product-video{min-height:220px}}.notebook-pad{min-height:160px}.notebook-entry{white-space:pre-wrap;border-radius:var(--radius-md);width:100%;min-height:140px;color:var(--text-primary);background:#fffcf4;border:.5px solid #f0e4c8;margin-bottom:14px;padding:16px 18px;line-height:1.7}.notebook-entry.readonly{background:var(--surface-mute);border-color:var(--border)}.note-prompt{color:var(--warn);align-items:center;gap:7px;margin:0 0 10px;font-size:12.5px;font-weight:700;display:flex}.note-prompt span{font-weight:700}.cte-intro{color:var(--text-secondary);margin:0 0 16px;font-size:14px;line-height:1.7}.sta-loop{grid-template-columns:repeat(4,minmax(0,1fr));align-items:stretch;gap:10px;margin-bottom:14px;display:grid}.sta-node{align-items:center;gap:10px;min-width:0;display:flex}.sta-step{background:var(--surface-mute);border:.5px solid var(--border);border-radius:var(--radius-md);text-align:center;flex:1;min-height:100px;padding:14px}.sti{background:var(--success-bg);width:42px;height:42px;color:var(--success);border-radius:999px;place-items:center;margin:0 auto 8px;font-size:12px;font-weight:800;display:grid}.stt{color:var(--text-primary);margin-bottom:4px;font-size:13.5px;font-weight:800}.sts{color:var(--text-secondary);font-size:12px;line-height:1.45}.sta-arrow{color:var(--success);flex-shrink:0}.cte-grid{grid-template-columns:repeat(auto-fit,minmax(190px,1fr));gap:10px;margin-bottom:14px;display:grid}.cte-card{background:var(--surface);border:.5px solid var(--border);border-radius:var(--radius-md);padding:14px}.cte-code{background:var(--success-bg);color:var(--success);letter-spacing:.04em;text-transform:uppercase;border-radius:999px;margin-bottom:8px;padding:3px 8px;font-size:10.5px;font-weight:800;display:inline-flex}.cte-name{color:var(--text-primary);margin-bottom:6px;font-size:13.5px;font-weight:800;line-height:1.35}.cte-desc{color:var(--text-secondary);font-size:12.5px;line-height:1.5}.cte-foot{color:var(--text-tertiary);align-items:center;gap:6px;margin-bottom:14px;font-size:12px;display:flex}@media (max-width:760px){.sta-loop{grid-template-columns:1fr}.sta-node{flex-direction:column}.sta-arrow{transform:rotate(90deg)}}.quiz-option:disabled{cursor:default;opacity:1}.quiz-option.correct{color:var(--text-primary);background:#e8f7ef;border-color:#19a974}.quiz-option.correct .opt-letter{color:#fff;background:#19a974}.quiz-option.wrong{color:var(--text-primary);background:#fdecec;border-color:#d85b5b}.quiz-option.wrong .opt-letter{color:#fff;background:#d85b5b}.quiz-foot.submitted{color:var(--text-primary);font-weight:700}