:root{--bg:#f6f4ef;--panel:#fff;--ink:#24303a;--muted:#69757f;--accent:#5a8f7b;--accent-dark:#2b5f4d;--accent2:#dfeee7;--warm:#f5e6de;--warm-ink:#8b4d2f;--line:#d9dfdc;--danger:#a94d42;--shadow:0 16px 42px rgba(36,48,58,.10);--soft-shadow:0 8px 24px rgba(36,48,58,.07);--radius:24px}
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#d5e2dc;font-size:18px;line-height:1.65}.scene-bullets li::before{content:"✓";font-weight:900;color:var(--accent);margin-right:10px}.scene-flow{display:grid;grid-template-columns:repeat(auto-fit,minmax(130px,1fr));gap:12px;margin-top:28px}.flow-node{padding:18px 12px;border-radius:18px;text-align:center;font-weight:850;background:#f1f4f2;border:1px solid var(--line);min-height:80px;display:grid;place-items:center}.flow-node:nth-child(2n){background:var(--accent2);border-color:#bfd8cd;color:#285947}.scene-contrast{display:grid;grid-template-columns:1fr 1fr;gap:18px;margin-top:26px}.contrast-card{border:1px solid var(--line);border-radius:20px;padding:21px;background:#fbfcfb}.contrast-card h3{font-size:21px;margin-bottom:10px;color:var(--accent-dark)}.contrast-card p{font-size:17px;line-height:1.75;margin-bottom:0;white-space:pre-line}.quiz-box{max-width:780px;margin:24px auto 0}.quiz-question{font-size:clamp(22px,3vw,31px);font-weight:850;line-height:1.55;margin-bottom:18px}.quiz-answers{display:grid;grid-template-columns:1fr 1fr;gap:12px}.quiz-answer{border:2px solid var(--line);background:#fff;border-radius:17px;padding:16px 18px;text-align:left;font-weight:780;transition:.15s ease;min-height:66px}.quiz-answer:hover{transform:translateY(-1px);border-color:#a9beb5}.quiz-answer.correct{background:#e3f1ea;border-color:#72a990;color:#245c46}.quiz-answer.wrong{background:#f7e5df;border-color:#c88362;color:#8b4529}.quiz-answer:disabled{cursor:default;transform:none}.quiz-feedback{min-height:68px;margin-top:16px;border-radius:16px;padding:14px 17px;background:#f2f4f3;display:none;line-height:1.65}.quiz-feedback.show{display:block}.quiz-feedback strong{display:block;margin-bottom:3px}.caption{position:absolute;left:24px;right:24px;bottom:88px;background:rgba(36,48,58,.93);color:#fff;border-radius:15px;padding:13px 17px;text-align:center;font-size:16px;line-height:1.55;box-shadow:0 8px 28px rgba(0,0,0,.16);min-height:52px;display:flex;align-items:center;justify-content:center}.player-controls{position:absolute;left:0;right:0;bottom:0;min-height:72px;border-top:1px solid var(--line);background:rgba(255,255,255,.97);backdrop-filter:blur(10px);display:flex;align-items:center;justify-content:space-between;gap:10px;padding:10px 17px}.control-group{display:flex;align-items:center;gap:8px}.primary-btn.playback{min-width:118px}.compact-select{display:block;font-size:11px;color:var(--muted)}.compact-select span{display:block;margin-bottom:3px}.compact-select select{height:40px;padding:0 28px 0 10px;max-width:175px}.player-status{font-size:12px;color:var(--muted);white-space:nowrap}.player-after{padding:15px 4px 0}.source-note{color:var(--muted);font-size:12px;line-height:1.65;white-space:pre-line}.player-after-actions{display:flex;gap:9px;justify-content:flex-end;flex-wrap:wrap}.start-overlay{position:absolute;inset:0;background:rgba(43,61,53,.94);z-index:30;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:16px;cursor:pointer;color:#fff;text-align:center;padding:20px}.start-circle{width:96px;height:96px;border-radius:50%;background:#fff;color:#2b3d35;display:grid;place-items:center;font-size:42px;padding-left:7px}.start-overlay strong{font-size:18px}.start-overlay span{font-size:13px;color:rgba(255,255,255,.78)}.help-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}.help-card,.help-wide-card{background:var(--panel);border:1px solid var(--line);border-radius:21px;padding:22px;box-shadow:var(--soft-shadow)}.help-card>span{width:35px;height:35px;border-radius:11px;background:var(--accent2);color:var(--accent-dark);display:grid;place-items:center;font-weight:950;margin-bottom:15px}.help-card h2{font-size:20px}.help-card p,.help-wide-card p{color:#526159;line-height:1.75;margin-bottom:0}.help-wide-card{margin-top:15px}.help-wide-card h2{font-size:22px}.app-dialog{border:0;padding:0;background:transparent;max-width:min(920px,calc(100vw - 24px));width:100%}.app-dialog::backdrop{background:rgba(28,38,34,.68);backdrop-filter:blur(4px)}.dialog-card{background:#fff;border-radius:24px;padding:24px;box-shadow:0 24px 70px rgba(0,0,0,.25);width:min(680px,100%);margin:auto}.dialog-card.wide{width:min(900px,100%)}.dialog-card.small{width:min(440px,100%)}.dialog-heading{display:flex;align-items:flex-start;justify-content:space-between;gap:16px}.dialog-heading h2{font-size:28px;margin-bottom:10px}.dialog-close{background:#eef1ef;width:40px;height:40px;padding:0;font-size:25px}.dialog-card>p{color:var(--muted);line-height:1.7}.dialog-actions{display:flex;justify-content:flex-end;gap:9px;margin-top:18px}.code-area{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:12px;white-space:pre}.export-grid{display:grid;grid-template-columns:1fr 1fr;gap:13px}.export-section{border:1px solid var(--line);border-radius:17px;padding:17px;background:#fbfcfb}.export-section.span-two{grid-column:1/-1}.export-section h3{font-size:18px;margin-bottom:7px}.export-section p{font-size:13px;color:var(--muted);line-height:1.65}.stack-actions{display:grid;gap:8px}.compact-grid label{font-size:12px}.progress-line{height:9px;background:#e5e7e5;border-radius:999px;overflow:hidden;margin-top:13px}.progress-line>div{height:100%;width:0;background:var(--accent);transition:width .2s}.small-note{font-size:12px!important;margin-top:8px!important;margin-bottom:0!important}.small-dialog{max-width:460px}.toast{position:fixed;left:50%;bottom:24px;transform:translate(-50%,18px);background:#26362f;color:#fff;padding:12px 17px;border-radius:13px;box-shadow:0 10px 30px rgba(0,0,0,.22);opacity:0;pointer-events:none;transition:.22s ease;z-index:200;font-size:14px;max-width:min(680px,calc(100vw - 30px));text-align:center}.toast.show{opacity:1;transform:translate(-50%,0)}
@media(max-width:980px){.hero-panel{grid-template-columns:1fr}.hero-actions{display:grid;grid-template-columns:repeat(3,1fr)}.hero-actions .primary-btn.large{grid-column:1/-1}.lecture-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.editor-layout{grid-template-columns:1fr}.editor-nav{position:static;display:flex;flex-wrap:wrap}.editor-nav a{display:none}.editor-nav .full{width:auto}.help-grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:700px){body{padding:0 8px 24px}.global-header{height:68px}.brand-mark{width:42px;height:42px}.brand-copy strong{font-size:15px}.brand-copy small{display:none}.local-badge{display:none}.view{padding-top:14px}.hero-panel{padding:23px;border-radius:23px}.hero-panel h1{font-size:34px}.hero-lead{font-size:16px}.hero-actions{grid-template-columns:1fr}.hero-actions .primary-btn.large{grid-column:auto}.boundary-panel{display:block}.boundary-panel strong{display:block;margin-bottom:5px;white-space:normal}.stats-row{grid-template-columns:1fr}.lecture-grid{grid-template-columns:1fr}.library-footer-actions{flex-direction:column}.view-heading,.form-card-heading{display:block}.heading-actions{margin-top:12px;justify-content:flex-start}.sticky-heading{top:68px}.editor-nav{gap:7px}.form-card{padding:18px;scroll-margin-top:180px}.form-card-heading p{text-align:left;margin-top:8px}.form-grid.two,.form-grid.three,.option-editor,.export-grid{grid-template-columns:1fr}.export-section.span-two{grid-column:auto}.lecture-stage{min-height:760px;border-radius:20px}.lecture-scene{min-height:760px;padding:78px 20px 182px}.field-marker{top:12px;left:12px;right:12px;text-align:center}.term-list,.quiz-answers,.scene-contrast{grid-template-columns:1fr}.caption{left:9px;right:9px;bottom:124px;font-size:14px;padding:10px 12px;min-height:54px}.player-controls{min-height:116px;align-items:center;flex-wrap:wrap;padding:8px 10px}.playback-controls{flex:1}.player-settings{order:3;width:100%;justify-content:center}.compact-select select{max-width:132px}.player-status{display:none}.player-progress-wrap{min-width:120px}.player-brand strong{max-width:165px}.player-after-actions{justify-content:stretch}.player-after-actions button{flex:1}.help-grid{grid-template-columns:1fr}.dialog-card{padding:19px;border-radius:20px}.dialog-heading h2{font-size:24px}.toolbar{position:sticky;top:68px;background:rgba(246,244,239,.96);padding:9px 0;z-index:60}.library-toolbar input,.library-toolbar select,.library-toolbar button{width:100%;min-width:0}.toast{bottom:14px}}
@media(max-width:430px){.header-actions .ghost-btn{font-size:0;width:40px;padding:0}.header-actions .ghost-btn::after{content:"?";font-size:16px}.header-actions #installButton::after{content:"＋"}.hero-panel h1{font-size:30px}.lecture-scene h1{font-size:31px}.lecture-scene h2{font-size:28px}.scene-definition{font-size:21px}.player-progress-wrap{min-width:95px}.player-count{display:none}.compact-select select{max-width:112px}}
@media(prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important;scroll-behavior:auto!important}}