:root{--bg:#f3f5f1;--surface:#fbfcf8;--surface-2:#e9eee8;--ink:#17211d;--muted:#59645f;--line:#cbd3ce;--accent:#e45f45;--accent-ink:#35130d;--accent-text:#b4402a;--focus:#116e5d;--radius:18px;--radius-sm:10px;--shadow:0 18px 50px rgb(34 54 45/.1);--max:1320px;--header:76px}*,:before,:after{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--ink);font-family:"Avenir Next","PingFang TC","Noto Sans TC",system-ui,sans-serif;line-height:1.65}button,input,textarea,select{font:inherit}button,a{-webkit-tap-highlight-color:transparent}a{color:inherit}button{color:inherit}.skip-link{position:fixed;left:16px;top:-80px;z-index:100;padding:10px 16px;background:var(--ink);color:var(--surface)}.skip-link:focus{top:12px}:focus-visible{outline:3px solid var(--focus);outline-offset:3px}.site-header{position:sticky;top:0;z-index:20;height:var(--header);padding:0 max(20px,calc((100vw - var(--max))/2));display:grid;grid-template-columns:auto 1fr auto;align-items:center;gap:36px;background:rgb(243 245 241/.94);border-bottom:1px solid var(--line);backdrop-filter:blur(14px)}.brand{display:flex;align-items:center;gap:12px;text-decoration:none;line-height:1.1}.brand-mark{width:38px;height:38px;display:grid;place-items:center;background:var(--ink);color:var(--surface);border-radius:var(--radius-sm);font-weight:900}.brand strong{display:block;font-size:.92rem}.brand small{display:block;margin-top:4px;color:var(--muted);font-size:.68rem}.site-nav{display:flex;justify-content:center;gap:28px}.site-nav a{text-decoration:none;font-size:.9rem;font-weight:650}.site-nav a[aria-current=page]{color:var(--accent-text)}.header-progress{display:flex;align-items:center;gap:10px;color:var(--muted);font-size:.8rem}.progress-dots{display:flex;gap:4px}.progress-dot{width:7px;height:7px;border:1px solid var(--muted);border-radius:50%}.progress-dot.done{background:var(--accent);border-color:var(--accent)}.menu-button{display:none;border:1px solid var(--line);background:var(--surface);border-radius:999px;padding:8px 14px}.page-shell{width:min(var(--max),calc(100% - 40px));margin:auto;padding:48px 0 100px}.hero{min-height:calc(100dvh - var(--header) - 24px);display:grid;grid-template-columns:minmax(0,.85fr) minmax(480px,1.15fr);align-items:center;gap:5vw}.kicker{margin:0 0 16px;color:var(--accent-text);font-size:.78rem;font-weight:800;letter-spacing:.12em;text-transform:uppercase}.hero h1{max-width:760px;margin:0;font-size:clamp(3rem,6.8vw,6.8rem);line-height:.95;letter-spacing:-.06em}.hero h1 span{display:block;color:var(--accent)}.hero .summary{max-width:600px;margin:28px 0;color:var(--muted);font-size:clamp(1rem,1.4vw,1.25rem)}.button-row{display:flex;flex-wrap:wrap;gap:12px}.button{min-height:48px;padding:12px 21px;display:inline-flex;align-items:center;justify-content:center;border:1px solid var(--ink);border-radius:999px;background:var(--ink);color:var(--surface);text-decoration:none;font-weight:750;white-space:nowrap;cursor:pointer}.button.secondary{background:transparent;color:var(--ink)}.button.accent{border-color:var(--accent);background:var(--accent);color:var(--accent-ink)}.button:active{transform:translateY(1px)}.work-preview{position:relative;min-width:0;padding:14px;background:#d7ddd8;border-radius:var(--radius);box-shadow:var(--shadow);transform:rotate(1deg)}.preview-toolbar{height:34px;display:flex;align-items:center;justify-content:space-between;padding:0 8px;color:#59645f;font-size:.7rem}.preview-status{display:flex;align-items:center;gap:7px}.preview-status:before{content:"";width:8px;height:8px;border-radius:50%;background:#498774}.work-preview iframe{width:100%;height:min(610px,68vh);display:block;border:0;border-radius:12px;background:white}.home-stats{margin:10px 0 100px;display:grid;grid-template-columns:1.2fr .8fr 1fr;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden}.home-stat{min-height:150px;padding:26px;display:flex;flex-direction:column;justify-content:space-between;border-right:1px solid var(--line)}.home-stat:last-child{border-right:0}.home-stat strong{font-size:clamp(2.4rem,5vw,4.8rem);line-height:1}.home-stat span{color:var(--muted)}.section-heading{max-width:800px;margin-bottom:42px}.section-heading h1,.section-heading h2{margin:0 0 16px;font-size:clamp(2.5rem,5vw,5rem);line-height:1;letter-spacing:-.055em}.section-heading p{max-width:650px;margin:0;color:var(--muted);font-size:1.08rem}.path-grid{display:grid;grid-template-columns:repeat(12,1fr);gap:18px}.lesson-card{grid-column:span 4;min-height:330px;padding:28px;display:flex;flex-direction:column;border:1px solid var(--line);border-radius:var(--radius);background:var(--surface);text-decoration:none}.lesson-card:nth-child(1),.lesson-card:nth-child(5){grid-column:span 7}.lesson-card:nth-child(2),.lesson-card:nth-child(6){grid-column:span 5}.lesson-card:hover{border-color:var(--ink)}.lesson-card .number{font-size:.78rem;font-weight:900}.lesson-card h3{max-width:420px;margin:auto 0 12px;font-size:clamp(1.7rem,3vw,3rem);line-height:1.05;letter-spacing:-.04em}.lesson-card p{margin:0;color:var(--muted)}.lesson-meta{margin-top:24px;display:flex;justify-content:space-between;gap:12px;font-size:.8rem}.lesson-card.completed{background:var(--surface-2)}.lesson-card.completed .number:after{content:" 已完成";color:var(--accent-text);margin-left:8px}.coral{--card:#f3b3a6}.blue{--card:#b9d8e7}.lime{--card:#cde59d}.yellow{--card:#ead589}.violet{--card:#cbbfe4}.teal{--card:#aad7ca}.lesson-card:before{content:"";width:70px;height:10px;background:var(--card);border-radius:999px}.feature-band{margin:100px 0 0;padding:50px;display:grid;grid-template-columns:1fr 1.1fr;gap:50px;background:var(--ink);color:var(--surface);border-radius:var(--radius)}.feature-band h2{font-size:clamp(2.4rem,5vw,4.8rem);line-height:1;margin:0}.feature-band ol{margin:0;padding:0;display:grid;grid-template-columns:1fr 1fr;gap:18px;list-style:none}.feature-band li{padding:20px;background:#25322d;border-radius:var(--radius-sm)}.feature-band b{display:block;color:#f39b83;font-size:1.6rem}.lesson-layout{display:grid;grid-template-columns:minmax(0,1fr) 290px;gap:70px;align-items:start}.lesson-hero{padding:30px 0 60px;border-bottom:1px solid var(--line)}.lesson-hero .lesson-index{display:inline-block;margin-bottom:24px;padding:6px 11px;background:var(--card,#cde59d);border-radius:999px;font-weight:850}.lesson-hero h1{max-width:900px;margin:0;font-size:clamp(3rem,7vw,6.5rem);line-height:.95;letter-spacing:-.06em}.lesson-hero .lead{max-width:650px;color:var(--muted);font-size:1.25rem}.outcome-grid{margin:40px 0;display:grid;grid-template-columns:repeat(3,1fr);gap:14px}.outcome{padding:20px;border:1px solid var(--line);border-radius:var(--radius-sm);background:var(--surface)}.lesson-section{padding:54px 0;border-bottom:1px solid var(--line)}.lesson-section h2{margin:0 0 14px;font-size:clamp(1.8rem,3vw,3rem);letter-spacing:-.035em}.lesson-section p{max-width:760px;color:var(--muted);font-size:1.08rem}.challenge-box{margin:54px 0;padding:36px;background:var(--ink);color:var(--surface);border-radius:var(--radius)}.challenge-box h2{font-size:2.2rem;margin:0 0 12px}.lesson-side{position:sticky;top:calc(var(--header) + 28px);padding:22px;border:1px solid var(--line);border-radius:var(--radius);background:var(--surface)}.lesson-side h2{font-size:1rem}.lesson-side label{display:flex;gap:10px;align-items:flex-start;margin:12px 0}.lesson-side .button{width:100%;margin-top:16px}.lesson-nav{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-top:50px}.lesson-nav a{padding:22px;border:1px solid var(--line);border-radius:var(--radius-sm);text-decoration:none}.lesson-nav a:last-child{text-align:right}.practice-layout{display:grid;grid-template-columns:270px 1fr;gap:28px}.practice-tabs{position:sticky;top:calc(var(--header) + 28px);align-self:start;display:grid;gap:8px}.practice-tabs button{padding:14px 16px;border:1px solid var(--line);border-radius:var(--radius-sm);background:transparent;text-align:left;cursor:pointer}.practice-tabs button.active{background:var(--ink);color:var(--surface)}.practice-panel{min-width:0;padding:32px;border:1px solid var(--line);border-radius:var(--radius);background:var(--surface)}.practice-panel h2{font-size:2rem}.question{margin:26px 0;padding-top:26px;border-top:1px solid var(--line)}.question:first-of-type{border-top:0}.option-list{display:grid;grid-template-columns:1fr 1fr;gap:10px}.option{padding:14px;border:1px solid var(--line);border-radius:var(--radius-sm);background:transparent;text-align:left;cursor:pointer}.option.selected{border-color:var(--ink);background:var(--surface-2)}.quiz-result{margin-top:28px;padding:22px;border-radius:var(--radius-sm);background:var(--surface-2)}.quiz-result.good{background:#d9ead5}.code-workspace{display:grid;grid-template-columns:1fr 1fr;gap:16px}.editor-group label{display:block;margin-bottom:8px;font-weight:750}.code-editor{width:100%;min-height:410px;padding:18px;resize:vertical;border:1px solid #46504b;border-radius:var(--radius-sm);background:#17211d;color:#f1f4ed;font-family:"SFMono-Regular",Consolas,monospace;font-size:.85rem;line-height:1.6;tab-size:2}.preview-frame{width:100%;min-height:448px;border:1px solid var(--line);border-radius:var(--radius-sm);background:white}.task-note{margin-bottom:20px;padding:18px;border-left:5px solid var(--accent);background:#f3ded7}.timer-shell{max-width:900px}.timer-display{margin:30px 0;font-variant-numeric:tabular-nums;font-size:clamp(4.5rem,14vw,10rem);line-height:.9;letter-spacing:-.07em}.timer-presets{display:flex;flex-wrap:wrap;gap:9px}.timer-presets button{padding:9px 14px;border:1px solid var(--line);border-radius:999px;background:transparent;cursor:pointer}.timer-presets button.active{background:var(--ink);color:var(--surface)}.milestones{margin-top:40px;display:grid;grid-template-columns:repeat(3,1fr);gap:12px}.milestone{padding:18px;border:1px solid var(--line);border-radius:var(--radius-sm)}.milestone.passed{background:#d9ead5}.resource-grid{display:grid;grid-template-columns:1fr 1fr;gap:18px}.resource{min-height:210px;padding:28px;display:flex;flex-direction:column;border:1px solid var(--line);border-radius:var(--radius);background:var(--surface);text-decoration:none}.resource h2{margin:auto 0 6px;font-size:1.65rem}.resource p{margin:0;color:var(--muted)}.site-footer{padding:48px max(20px,calc((100vw - var(--max))/2));display:grid;grid-template-columns:1fr 1fr;gap:40px;background:var(--ink);color:var(--surface)}.site-footer p{max-width:600px;color:#bfc8c3}.noscript{padding:20px;background:#fff1c4}.empty-state{padding:70px 30px;text-align:center}.empty-state h1{font-size:3rem}.visually-hidden{position:absolute!important;width:1px!important;height:1px!important;padding:0!important;margin:-1px!important;overflow:hidden!important;clip:rect(0,0,0,0)!important;white-space:nowrap!important;border:0!important}
@media(max-width:1050px){.site-header{grid-template-columns:auto auto 1fr}.header-progress{display:none}.site-nav{justify-content:flex-end}.hero{grid-template-columns:1fr}.hero-copy{padding-top:30px}.work-preview{transform:none}.work-preview iframe{height:540px}.lesson-card,.lesson-card:nth-child(n){grid-column:span 6}.feature-band{grid-template-columns:1fr}.lesson-layout{grid-template-columns:1fr}.lesson-side{position:static}.practice-layout{grid-template-columns:1fr}.practice-tabs{position:static;grid-template-columns:repeat(3,1fr)}}
@media(max-width:760px){:root{--header:68px}.page-shell{width:min(100% - 28px,var(--max));padding-top:30px}.site-header{padding:0 14px;grid-template-columns:1fr auto}.site-nav{position:absolute;left:14px;right:14px;top:62px;padding:18px;display:none;flex-direction:column;align-items:stretch;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow)}.site-nav.open{display:flex}.menu-button{display:block}.brand small{display:none}.hero{min-height:calc(100dvh - var(--header));padding:44px 0 70px}.hero h1{font-size:clamp(3.1rem,16vw,5rem)}.work-preview{display:none}.home-stats{grid-template-columns:1fr}.home-stat{min-height:120px;border-right:0;border-bottom:1px solid var(--line)}.home-stat:last-child{border-bottom:0}.lesson-card,.lesson-card:nth-child(n){grid-column:1/-1;min-height:270px}.feature-band{padding:28px}.feature-band ol{grid-template-columns:1fr}.outcome-grid{grid-template-columns:1fr}.lesson-nav{grid-template-columns:1fr}.lesson-nav a:last-child{text-align:left}.practice-tabs{display:flex;overflow:auto}.practice-tabs button{flex:0 0 auto}.practice-panel{padding:20px}.option-list,.code-workspace,.milestones,.resource-grid,.site-footer{grid-template-columns:1fr}.timer-display{font-size:25vw}}
@media(prefers-color-scheme:dark){:root{--bg:#111714;--surface:#18201c;--surface-2:#222d28;--ink:#edf1ec;--muted:#aab5af;--line:#3d4943;--accent:#f07a60;--accent-ink:#28100b;--focus:#88d6c5;--shadow:0 18px 50px rgb(0 0 0/.25)}.site-header{background:rgb(17 23 20/.94)}.code-editor{background:#0a0f0d}.task-note{background:#43271f}.quiz-result.good,.milestone.passed{background:#22452f}.brand-mark,.button,.practice-tabs button.active,.timer-presets button.active{background:#edf1ec;color:#17211d}.feature-band{background:#e9eee8;color:#17211d}.feature-band li{background:#d6ded9}.site-footer{background:#080c0a}.preview-toolbar{color:#1c2c25}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}.button:active{transform:none}}

/* Typography and spacing refinement */
:root{--max:1480px}
body{line-height:1.75;letter-spacing:.015em}
.page-shell{width:min(var(--max),calc(100% - 56px));padding:64px 0 120px}
.hero{min-height:calc(100dvh - var(--header));padding:56px 0 72px;grid-template-columns:minmax(560px,.92fr) minmax(540px,1.08fr);gap:clamp(56px,6vw,112px)}
.kicker{margin-bottom:22px;letter-spacing:.14em}
.hero h1{max-width:780px;font-size:clamp(3.5rem,4.6vw,5.25rem);line-height:1.08;letter-spacing:-.04em;word-break:keep-all;text-wrap:balance}
.hero h1 span{margin-top:.08em}
.hero .summary{max-width:570px;margin:36px 0 40px;font-size:clamp(1.04rem,1.25vw,1.22rem);line-height:1.9;letter-spacing:.025em}
.work-preview{transform:rotate(.5deg)}
.preview-toolbar{height:38px;padding:0 10px;font-size:.72rem;letter-spacing:.03em}
.work-preview iframe{height:min(600px,64vh)}
.section-heading{max-width:860px;margin-bottom:56px}
.section-heading h1,.section-heading h2{margin-bottom:24px;font-size:clamp(2.5rem,4.6vw,4.8rem);line-height:1.12;letter-spacing:-.04em;text-wrap:balance}
.section-heading p{max-width:680px;font-size:1.1rem;line-height:1.9}
.lesson-card{min-height:350px;padding:32px}
.lesson-card h3{margin-bottom:18px;font-size:clamp(1.7rem,2.7vw,2.8rem);line-height:1.16;letter-spacing:-.025em}
.lesson-card p{line-height:1.85}

@media(max-width:1180px){.hero{grid-template-columns:1fr;gap:56px}.hero-copy{padding-top:24px}.work-preview{transform:none}.work-preview iframe{height:560px}}
@media(max-width:760px){.page-shell{width:min(100% - 32px,var(--max));padding:36px 0 88px}.hero{min-height:calc(100dvh - var(--header));padding:48px 0 64px}.hero h1{font-size:clamp(3rem,14vw,4.25rem);line-height:1.08}.hero .summary{margin:28px 0 32px;font-size:1rem;line-height:1.85}.lesson-card{min-height:290px;padding:26px}}

/* Full lesson reading experience */
.reading-layout{grid-template-columns:minmax(0,900px) 330px;justify-content:space-between;gap:clamp(48px,6vw,96px)}
.reading-layout .lesson-content{min-width:0}
.reading-layout .lesson-hero{padding-top:40px;padding-bottom:72px}
.reading-layout .lesson-hero h1{font-size:clamp(3.25rem,5.5vw,5.8rem);line-height:1.08;letter-spacing:-.045em;word-break:keep-all}
.reading-layout .lesson-hero .lead{max-width:680px;margin-top:28px;line-height:1.9}
.reading-layout .outcome-grid{margin-top:52px;gap:16px}
.reading-layout .outcome{padding:24px}
.reading-layout .outcome p{margin-bottom:0;line-height:1.75}
.rich-lesson{padding:80px 0;scroll-margin-top:calc(var(--header) + 24px)}
.chapter-heading{display:grid;grid-template-columns:56px 1fr;gap:22px;align-items:start;margin-bottom:44px}
.chapter-heading>span{padding-top:9px;color:var(--accent-text);font-size:.8rem;font-weight:850;letter-spacing:.08em}
.chapter-heading p{margin:0 0 7px;color:var(--muted);font-size:.78rem;font-weight:750;letter-spacing:.06em}
.chapter-heading h2{max-width:720px;margin:0;font-size:clamp(2rem,3.5vw,3.3rem);line-height:1.18;letter-spacing:-.03em;text-wrap:balance}
.prose{width:calc(100% - 78px);max-width:75ch;min-width:0;margin-left:78px;color:var(--muted);font-size:1.06rem;line-height:1.95}
.prose>*+*{margin-top:28px}
.prose h3{margin-top:48px;margin-bottom:16px;color:var(--ink);font-size:1.3rem;line-height:1.4;letter-spacing:-.01em}
.prose p{margin-bottom:0}
.prose ul,.prose ol{padding-left:1.4em}
.prose li+li{margin-top:10px}
.prose strong{color:var(--ink)}
.lesson-screenshot{margin:28px 0 32px;padding:18px;border:1px solid var(--line);border-radius:var(--radius);background:var(--surface-2)}
.lesson-screenshot figcaption{display:grid;gap:4px;margin-bottom:14px;line-height:1.7}.lesson-screenshot figcaption span{color:var(--muted);font-size:.92rem}
.screenshot-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,220px),1fr));gap:14px;align-items:start}
.screenshot-shot{display:grid;gap:8px;justify-items:start;color:inherit;text-decoration:none;min-width:0}.screenshot-shot.is-wide{grid-column:1/-1}
.screenshot-shot img{display:block;width:auto;max-width:100%;height:auto;border:1px solid var(--line);border-radius:8px;background:#fff;box-shadow:0 8px 22px rgb(23 33 29/.08)}
.screenshot-shot:hover img,.screenshot-shot:focus-visible img{border-color:var(--accent)}.screenshot-shot:focus-visible{outline:3px solid var(--focus);outline-offset:4px;border-radius:8px}
.screenshot-label{font-weight:700;font-size:.92rem}.screenshot-note{margin:12px 0 0;color:var(--muted);font-size:.85rem}
kbd{display:inline-block;min-width:1.6em;padding:0 .4em;border:1px solid var(--line);border-bottom-width:2px;border-radius:5px;background:var(--surface);font:600 .85em/1.6 ui-monospace,SFMono-Regular,Menlo,monospace;text-align:center;white-space:nowrap}
.lesson-visual{width:100%;margin:0 0 36px}
.lesson-visual img{width:100%;height:auto;display:block;border:1px solid var(--line);border-radius:var(--radius);background:var(--surface-2);box-shadow:0 14px 34px rgb(23 33 29/.09)}
.lesson-visual figcaption{margin-top:12px;padding-left:14px;border-left:3px solid var(--accent);color:var(--muted);font-size:.9rem;line-height:1.7}
.lesson-illustration{margin:28px 0 36px;padding:20px;border:1px solid var(--line);border-radius:var(--radius-sm);background:var(--surface-2);color:var(--ink)}
.lesson-illustration figcaption{display:grid;gap:8px;margin-bottom:18px;line-height:1.7}
.lesson-illustration figcaption strong{font-size:1.06rem}
.lesson-illustration figcaption span{color:var(--muted);font-size:.95rem}
.lesson-illustration-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,290px),1fr));gap:16px;align-items:start}
.diagram-panel{min-width:0;padding:10px;background:#fffaf0;border:1px solid var(--line);border-radius:12px}
.diagram-panel-label{margin:0 0 8px!important;font-size:1rem;font-weight:750;line-height:1.6}
.diagram-panel svg{display:block;width:100%;max-width:400px;height:auto;margin:auto;aspect-ratio:320/220}
.diagram-transcript{margin-top:14px;font-size:.95rem}
.diagram-transcript summary{min-height:44px;padding:10px 0;cursor:pointer;font-weight:700}
.diagram-transcript ul{margin:8px 0 0}
.diagram-transcript summary:focus-visible{outline:3px solid var(--focus);outline-offset:3px}
@media(max-width:760px){.lesson-illustration{padding:12px}.diagram-panel{padding:6px}.lesson-illustration-grid{grid-template-columns:1fr}}
.concept-animation{width:100%;margin:0 0 44px;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;background:var(--surface);box-shadow:0 14px 34px rgb(23 33 29/.08)}
.animation-canvas{width:100%;background:#f4efe3}
.animation-canvas svg{width:100%;height:auto;display:block}
.concept-animation figcaption{padding:18px 22px 0;display:grid;gap:5px;color:var(--muted);font-size:.92rem;line-height:1.65}
.concept-animation figcaption strong{color:var(--ink);font-size:1.05rem}
.animation-controls{padding:18px 22px 22px;display:flex;flex-wrap:wrap;align-items:center;gap:9px}
.animation-controls button{min-width:76px;min-height:44px;padding:9px 15px;border:1px solid var(--ink);border-radius:999px;background:transparent;color:var(--ink);font-weight:750;cursor:pointer}
.animation-controls button:first-child{background:var(--ink);color:var(--surface)}
.animation-controls button:disabled{opacity:.45;cursor:not-allowed}
.animation-status{margin-left:auto;color:var(--muted);font-size:.82rem;font-weight:700}
.anim-bg{fill:#f4efe3}.anim-stage{fill:#17211d}.anim-card{fill:#fffaf0;stroke:#cbd3ce;stroke-width:2}.anim-result{fill:#aad7ca}.anim-block{fill:#f07a60}.anim-block.alt{fill:#aad7ca}.anim-block.warm{fill:#ead589}.anim-text{fill:#17211d;font-family:"Avenir Next",Arial,sans-serif;font-size:20px;font-weight:750}.anim-label{font-size:18px}.anim-number{fill:#e45f45;font-size:16px}.anim-code{font-family:"SFMono-Regular",Consolas,monospace;font-size:18px}.anim-winner{fill:#17211d;font-size:27px}.anim-line,.anim-axis{fill:none;stroke:#e45f45;stroke-width:9;stroke-linecap:round}.cross-row,.cross-col{stroke:#ead589}.axis-label{fill:#edf1ec;font-size:16px}.vertical-label{writing-mode:vertical-rl}.flex-column-axes{opacity:0}.anim-grid-line{fill:none;stroke:#59645f;stroke-width:3}.anim-track{fill:none;stroke:#59645f;stroke-width:10;stroke-linecap:round}.box-margin{fill:#ead589}.box-border{fill:#f07a60}.box-padding{fill:#aad7ca}.box-content{fill:#cbbfe4}.box-label{font-size:16px}.box-guide{fill:none;stroke:#17211d;stroke-width:3;stroke-linecap:round}.origin-point{fill:#17211d}.origin-card{transform-box:view-box}.bubble-dot{fill:#e45f45;opacity:.15}
.anim-step{opacity:.22;transform:translateY(8px);transform-box:fill-box;transform-origin:center}
.show-static-steps .anim-step,.show-static-steps .bubble-dot{opacity:1;transform:none}
.concept-animation.is-playing .anim-step{animation:concept-step 650ms ease forwards}
.concept-animation.is-playing .anim-step-1{animation-delay:0ms}.concept-animation.is-playing .anim-step-2{animation-delay:750ms}.concept-animation.is-playing .anim-step-3{animation-delay:1500ms}.concept-animation.is-playing .anim-step-4{animation-delay:2250ms}.concept-animation.is-playing .anim-step-5{animation-delay:3000ms}
.concept-animation.is-playing .flex-items .one{animation:flex-one-demo 4.8s ease-in-out both}.concept-animation.is-playing .flex-items .two{animation:flex-two-demo 4.8s ease-in-out both}.concept-animation.is-playing .flex-items .three{animation:flex-three-demo 4.8s ease-in-out both}.concept-animation.is-playing .flex-row-axes{animation:flex-row-axes-demo 4.8s ease-in-out both}.concept-animation.is-playing .flex-column-axes{animation:flex-column-axes-demo 4.8s ease-in-out both}
.concept-animation.is-playing .transition-dot{animation:transition-demo 600ms ease both}
.concept-animation.is-playing .origin-center{animation:rotate-center-demo 600ms ease both;transform-origin:280px 235px}.concept-animation.is-playing .origin-corner{animation:rotate-corner-demo 600ms ease both;transform-origin:565px 310px}
.concept-animation.is-playing .keyframe-dot{animation:keyframe-demo 480ms ease both}
.animation-static-note{padding:0 22px 22px;color:var(--muted);font-size:.9rem}
.concept-animation.is-playing .event-pulse{animation:event-flow-demo 5s steps(4,end) both}.event-pulse{fill:#e45f45}
.concept-animation.is-playing .toggle-menu{animation:menu-open-demo 3.4s ease both;transform-box:fill-box;transform-origin:top center}
.concept-animation.is-playing .bubble-1{animation:bubble-demo 750ms ease 400ms forwards}.concept-animation.is-playing .bubble-2{animation:bubble-demo 750ms ease 1200ms forwards}.concept-animation.is-playing .bubble-3{animation:bubble-demo 750ms ease 2000ms forwards}.concept-animation.is-playing .bubble-4{animation:bubble-demo 750ms ease 2800ms forwards}
.learning-guide{margin:32px 0 16px;padding:18px 20px;border-left:5px solid var(--accent);border-radius:0 var(--radius-sm) var(--radius-sm) 0;background:var(--surface-2);color:var(--ink)}.learning-guide p{margin:5px 0 0!important;font-size:.94rem!important}
.student-live-demo{margin:24px 0;padding:22px;border:1px solid var(--line);border-radius:var(--radius-sm);background:#f4f7f3;color:var(--ink)}
.student-live-demo .demo-eyebrow{margin:0 0 10px;color:var(--muted);font-size:.78rem;font-weight:850;letter-spacing:.08em;text-transform:uppercase}
.student-live-demo .demo-message{margin:0 0 14px;padding:15px 16px;border-radius:10px;background:#e4e8e5;transition:background-color .2s ease,color .2s ease}
.student-live-demo .demo-message.is-success{background:#d8eee6;color:#145847;font-weight:800}
.student-live-demo button{min-height:44px;margin:0 8px 8px 0;padding:10px 16px;border:1px solid var(--ink);border-radius:999px;background:var(--ink);color:#fff;font:inherit;font-weight:750;cursor:pointer}
.student-live-demo .demo-reset{background:transparent;color:var(--ink)}
.student-live-demo label{display:block;margin-bottom:8px;font-weight:800}
.student-live-demo input{width:100%;min-height:46px;padding:10px 12px;border:1px solid #87958e;border-radius:8px;background:#fff;color:var(--ink);font:inherit}
.student-live-demo input:focus-visible{outline:3px solid #74b8a7;outline-offset:2px}
.student-live-demo .demo-count{margin:5px 0 0;color:var(--muted);font-size:.85rem;text-align:right}
.concept-animation.is-paused *{animation-play-state:paused!important}
.tab-on-dark,.pd-button-text{fill:#fff}
.pos-badge{transform:translate(206px,-136px)}.show-static-steps .pos-badge{transform:none}
.concept-animation.is-playing .pos-badge{animation:pos-badge-demo 3.2s ease both}
.concept-animation.is-playing .wrap-edge{animation:wrap-edge-demo 4s ease both}.concept-animation.is-playing .wrap-three{animation:wrap-three-demo 4s ease both}.concept-animation.is-playing .wrap-four{animation:wrap-four-demo 4s ease both}
.show-static-steps .wrap-edge{transform:translateX(-300px)}.show-static-steps .wrap-three{transform:translate(-390px,150px)}.show-static-steps .wrap-four{transform:translate(-390px,150px)}
.bp-mid,.bp-narrow{opacity:0}.show-static-steps .bp-wide,.show-static-steps .bp-mid{opacity:0}.show-static-steps .bp-narrow{opacity:1}
.concept-animation.is-playing .bp-wide{animation:bp-wide-demo 5s ease both}.concept-animation.is-playing .bp-mid{animation:bp-mid-demo 5s ease both}.concept-animation.is-playing .bp-narrow{animation:bp-narrow-demo 5s ease both}
.concept-animation.is-playing .mod-frame{animation:mod-frame-demo 3s steps(1,end) both}
.pd-message{opacity:0}.show-static-steps .pd-message{opacity:1}.show-static-steps .pd-typed{opacity:0}
.pd-reload{opacity:0}.show-static-steps .pd-reload{opacity:1}
.concept-animation.is-playing .pd-flash{animation:pd-flash-demo 3.2s ease both}.concept-animation.is-playing .pd-typed{animation:pd-typed-demo 3.2s ease both}.concept-animation.is-playing .pd-message{animation:pd-message-demo 3.2s ease both}.concept-animation.is-playing .pd-reload{animation:pd-message-demo 3.2s ease both}
@keyframes pos-badge-demo{0%,40%{transform:translate(206px,-136px)}75%,100%{transform:none}}
@keyframes wrap-edge-demo{0%,20%{transform:none}50%,100%{transform:translateX(-300px)}}
@keyframes wrap-three-demo{0%,45%{transform:none}70%,100%{transform:translate(-390px,150px)}}
@keyframes wrap-four-demo{0%,55%{transform:none}85%,100%{transform:translate(-390px,150px)}}
@keyframes bp-wide-demo{0%,22%{opacity:1}32%,100%{opacity:0}}@keyframes bp-mid-demo{0%,26%{opacity:0}36%,58%{opacity:1}68%,100%{opacity:0}}
@keyframes bp-narrow-demo{0%,62%{opacity:0}72%,100%{opacity:1}}
@keyframes mod-frame-demo{0%{transform:none}25%{transform:translateX(260px)}50%{transform:translateX(520px)}75%,100%{transform:none}}
@keyframes pd-flash-demo{0%,30%{opacity:0}40%{opacity:.95}60%,100%{opacity:0}}
@keyframes pd-typed-demo{0%,38%{opacity:1}40%,100%{opacity:0}}
@keyframes pd-message-demo{0%,45%{opacity:0}65%,100%{opacity:1}}

@keyframes concept-step{to{opacity:1;transform:none}}
@keyframes flex-one-demo{0%,42%{transform:none}58%,100%{transform:translate(180px,-85px)}}
@keyframes flex-two-demo{0%,42%{transform:none}58%,100%{transform:translate(0,5px)}}
@keyframes flex-three-demo{0%,42%{transform:none}58%,100%{transform:translate(-180px,95px)}}
@keyframes flex-row-axes-demo{0%,42%{opacity:1}58%,100%{opacity:0}}
@keyframes flex-column-axes-demo{0%,42%{opacity:0}58%,100%{opacity:1}}
@keyframes transition-demo{from{transform:translateY(0)}to{transform:translateY(-12px)}}
@keyframes rotate-center-demo{from{transform:rotate(0)}to{transform:rotate(35deg)}}
@keyframes rotate-corner-demo{from{transform:rotate(0)}to{transform:rotate(35deg)}}
@keyframes keyframe-demo{from{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}
@keyframes event-flow-demo{0%{transform:translateX(0)}100%{transform:translateX(760px)}}
@keyframes menu-open-demo{0%,35%{opacity:.18;transform:scaleY(.12)}75%,100%{opacity:1;transform:scaleY(1)}}
@keyframes bubble-demo{0%{opacity:.15;transform:scale(.6)}60%{opacity:1;transform:scale(1.7)}100%{opacity:.55;transform:scale(1)}}
@media(max-width:760px){.concept-animation{margin-bottom:34px}.concept-animation figcaption,.animation-controls{padding-left:16px;padding-right:16px}.animation-status{width:100%;margin:4px 0 0}.animation-controls button{flex:1 1 90px}}
@media(prefers-reduced-motion:reduce){.concept-animation,.concept-animation *{animation:none!important;transition:none!important}.concept-animation .anim-step,.concept-animation .bubble-dot{opacity:1;transform:none}.animation-controls button[data-animation-action="pause"]{display:none}}
.download-callout{max-width:820px;padding:24px;display:flex;align-items:center;justify-content:space-between;gap:24px;border:1px solid var(--line);border-radius:var(--radius);background:var(--surface-2);color:var(--ink)}
.lesson-hero .download-callout{margin-top:36px}
.download-callout p{margin:6px 0 0;font-size:.98rem}
.download-callout .button{flex:0 0 auto}
.download-callout strong{display:block;margin-top:8px;font-size:1.35rem}
.download-label{display:inline-flex;padding:4px 9px;border-radius:999px;background:var(--accent);color:var(--accent-ink);font-size:.75rem;font-weight:850;letter-spacing:.04em}
.download-primary{min-height:52px;padding-inline:22px;text-align:center}
.download-help{max-width:820px!important;margin-top:12px!important;font-size:.94rem!important}
.integrated-reference{scroll-margin-top:calc(var(--header) + 22px)}
.integrated-reference .prose>h3:first-child{margin-top:0}
.integrated-reference details{padding:18px 20px;border:1px solid var(--line);border-radius:var(--radius-sm);background:var(--surface)}
.integrated-reference summary{color:var(--ink);font-weight:800;cursor:pointer}
.lesson-side{max-height:calc(100dvh - var(--header) - 56px);overflow:auto}
.prose pre{max-width:100%;padding:24px;overflow:auto;border:1px solid var(--line);border-radius:var(--radius-sm);background:#111714;color:#edf1ec;line-height:1.65;tab-size:2}
.prose code{font-family:"SFMono-Regular",Consolas,monospace;font-size:.88rem}
.table-wrap{display:block;width:100%;max-width:100%;min-width:0;overflow-x:auto;border:1px solid var(--line);border-radius:var(--radius-sm)}
.prose table{width:100%;min-width:640px;border-collapse:collapse;background:var(--surface);color:var(--ink);font-size:.94rem;line-height:1.65}
.prose th,.prose td{padding:17px 18px;text-align:left;vertical-align:top;border-bottom:1px solid var(--line)}
.prose th{background:var(--surface-2);font-size:.82rem;letter-spacing:.04em}
.prose tr:last-child td{border-bottom:0}
.lesson-note,.exercise{padding:24px 26px;border-radius:var(--radius-sm);background:var(--surface-2);color:var(--ink)}
.lesson-note{border-left:5px solid var(--focus)}
.teacher-note{border-left-color:var(--accent)}
.exercise{border:1px solid var(--line);background:var(--surface)}
.lesson-note p,.exercise p{margin:8px 0 0;color:var(--muted)}
.inline-demo{min-height:48px;padding:14px 18px;display:inline-flex;align-items:center;border:1px solid var(--line);border-radius:999px;color:var(--ink);font-weight:750;text-decoration:none}
.lesson-side{padding:26px;max-height:calc(100dvh - var(--header) - 56px);overflow:auto}
.lesson-toc h2,.lesson-checks h2{margin:0 0 18px;font-size:.92rem;letter-spacing:.04em}
.lesson-toc li.is-complete a{color:var(--focus)}
.toc-status{margin-left:8px;font-weight:900}
.lesson-toc ol{margin:0;padding:0;list-style:none}
.lesson-toc li+li{margin-top:5px}
.toc-group+.toc-group{margin-top:18px;padding-top:14px;border-top:1px solid var(--line)}
.toc-group-label{margin:0 0 8px;color:var(--ink);font-size:.72rem;font-weight:800;letter-spacing:.06em}
.chapter-next{margin-top:28px;padding-top:16px;border-top:1px solid var(--line);color:var(--muted)}
.lesson-toc a{min-height:46px;padding:9px 0;display:grid;grid-template-columns:30px minmax(0,1fr) 18px;align-items:center;gap:8px;color:var(--muted);font-size:.9rem;line-height:1.45;text-decoration:none}
.lesson-toc a:hover,.lesson-toc a:focus-visible{color:var(--ink)}
.lesson-toc a span{color:var(--accent-text);font-size:.72rem;font-weight:850}
.lesson-toc a .toc-title{color:inherit;font-size:inherit;font-weight:inherit}.lesson-toc a .toc-sub{display:block;margin-top:2px;color:var(--muted);font-size:.72rem;font-weight:650}
.lesson-checks{margin-top:28px;padding-top:26px;border-top:1px solid var(--line)}
.lesson-checks label{line-height:1.55}

@media(max-width:1180px){.reading-layout{grid-template-columns:1fr}.lesson-side{position:static;max-height:none;display:grid;grid-template-columns:1fr 1fr;gap:32px}.lesson-checks{margin:0;padding:0 0 0 32px;border-top:0;border-left:1px solid var(--line)}}
@media(max-width:760px){.page-shell,.reading-layout{width:min(var(--max),calc(100% - 32px))}.reading-layout .lesson-hero{padding-top:20px;padding-bottom:52px}.reading-layout .lesson-hero h1{font-size:clamp(2.8rem,13vw,4.2rem)}.reading-layout .outcome-grid{margin-top:36px}.rich-lesson{padding:56px 0}.chapter-heading{grid-template-columns:36px minmax(0,1fr);gap:10px;margin-bottom:30px}.chapter-heading h2{font-size:clamp(1.8rem,8vw,2.5rem)}.prose{width:100%;margin-left:0;font-size:1rem;line-height:1.9}.prose pre{padding:18px}.download-callout{align-items:stretch;flex-direction:column}.download-callout .button{width:100%}.lesson-side{grid-template-columns:minmax(0,1fr);padding:22px}.lesson-checks{padding:24px 0 0;border-left:0;border-top:1px solid var(--line)}}
@media(max-width:760px){.reading-layout .lesson-hero h1{word-break:normal;overflow-wrap:anywhere}}

/* Fixed-template adaptation lab */
.template-lab{display:grid;grid-template-columns:minmax(280px,.8fr) minmax(0,1.2fr);gap:28px;align-items:start;margin-top:32px}
.template-controls{display:grid;gap:18px}
.field{display:grid;gap:7px}
.field label{font-weight:750}
.field input,.field textarea,.field select{width:100%;min-height:48px;padding:11px 13px;border:1px solid var(--line);border-radius:var(--radius-sm);background:var(--bg);color:var(--ink)}
.field textarea{resize:vertical}
.field input[type=color]{height:52px;padding:6px}
.template-preview{min-height:660px}
.ready-checks{display:grid;gap:12px;margin:24px 0}
.ready-checks .option span{display:flex;align-items:flex-start;gap:12px}
.ready-checks .option b{display:grid;flex:0 0 28px;width:28px;height:28px;place-items:center;border-radius:50%;background:var(--ink);color:var(--surface);font-size:.8rem}
.practice-hint{margin-top:18px;padding:16px 18px;border:1px solid var(--line);border-radius:var(--radius-sm);background:var(--surface)}
.practice-hint summary{min-height:44px;display:flex;align-items:center;font-weight:800;cursor:pointer}
.practice-hint code{font-family:"SFMono-Regular",Consolas,monospace}
@media(max-width:900px){.template-lab{grid-template-columns:1fr}.template-preview{min-height:720px}}

/* Downloadable resource cards */
.robot-callout{margin:0 0 28px;padding:30px;display:flex;align-items:center;justify-content:space-between;gap:30px;border:1px solid var(--line);border-radius:var(--radius);background:var(--ink);color:var(--surface)}
.robot-callout h2{margin:0 0 8px;font-size:clamp(1.7rem,3vw,2.6rem);line-height:1.15}.robot-callout p{max-width:680px;margin:0;color:#c8d1cc}.robot-callout .kicker{margin-bottom:8px;color:#f39b83}.robot-callout .button{flex:0 0 auto}
@media(max-width:760px){.robot-callout{align-items:stretch;flex-direction:column;padding:24px}.robot-callout .button{width:100%}}
.resource{min-height:240px;text-decoration:none}
.resource-tag{align-self:flex-start;padding:5px 9px;border-radius:999px;background:var(--surface-2);color:var(--muted);font-size:.74rem;font-weight:800;letter-spacing:.04em}
.resource-actions{margin-top:24px;display:flex;flex-wrap:wrap;gap:10px}
.resource-actions a{min-height:44px;padding:10px 15px;display:inline-flex;align-items:center;justify-content:center;border:1px solid var(--ink);border-radius:999px;text-decoration:none;font-weight:750}
.resource-preview{background:transparent;color:var(--ink)}
.resource-download{background:var(--ink);color:var(--surface)}
.resource-actions a:hover{border-color:var(--accent)}
.resource-actions a:active{transform:translateY(1px)}

.preview-caption{margin:12px 10px 0;color:var(--muted);font-size:.9rem;line-height:1.5}
.practice-gate{margin:0 0 18px;padding:16px 18px;border:1px solid var(--line);border-radius:var(--radius-sm);background:var(--surface-2)}
.practice-gate strong{display:block;margin-bottom:6px}
.practice-gate p{margin:0 0 8px}
.practice-gate.is-ready{background:transparent}
.resource-group{margin:0 0 40px}
.resource-group h2{margin:0 0 8px;font-size:1.6rem}
.resource-group > p{margin:0 0 18px;color:var(--muted)}
.teacher-tools{margin:8px 0 0;padding:16px 18px;border-top:1px solid var(--line);color:var(--muted);font-size:.92rem}
.teacher-tools a{text-decoration:underline}
.site-nav a.nav-primary{font-weight:800}
.progress-overview{margin:0 0 48px;padding:24px;border:1px solid var(--line);border-radius:var(--radius);background:var(--surface);display:grid;grid-template-columns:minmax(220px,.7fr) 1.3fr;gap:26px;align-items:start}
.progress-overview h2{margin:0;font-size:clamp(1.8rem,4vw,3rem);letter-spacing:-.04em}
.progress-overview p:not(.kicker){margin:10px 0 0;color:var(--muted);font-size:.9rem}
.progress-overview ol{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px;margin:0;padding:0;list-style:none}
.progress-overview-item a{min-height:64px;padding:10px 12px;display:grid;grid-template-columns:52px 1fr auto;gap:8px;align-items:center;border:1px solid var(--line);border-radius:var(--radius-sm);text-decoration:none;background:var(--surface-2)}
.progress-overview-item a:hover,.progress-overview-item a:focus-visible{border-color:var(--accent)}
.progress-overview-item span,.progress-overview-item small{color:var(--muted);font-size:.76rem}.progress-overview-item strong{font-size:.9rem}.progress-overview-item.is-complete a{border-color:var(--focus);background:color-mix(in srgb,var(--focus) 10%,var(--surface))}.progress-overview-item.is-complete small{color:var(--focus);font-weight:800}
.site-nav a.nav-later{color:var(--muted)}
.site-nav a[aria-current="page"]{text-decoration:underline;text-underline-offset:6px}
.footer-primary{display:flex;flex-wrap:wrap;gap:12px 20px;margin:10px 0 8px;font-weight:800}
.footer-primary a{text-decoration:underline;text-underline-offset:4px}
.footer-later{margin:0;color:var(--muted);font-size:.88rem}
.lesson-group-nav{margin:0 0 36px;padding:20px 22px;border:1px solid var(--line);border-radius:var(--radius-sm);background:var(--surface-2)}
.lesson-group-nav p{margin:0 0 10px}
.lesson-group-nav .button-row{margin-top:8px}
.lesson-group-nav .button{white-space:normal;min-width:0}
.lesson-group-nav a[data-lesson-group="next"][hidden]{display:none!important}
.group-switcher{margin-top:16px}
.group-switcher summary{cursor:pointer;font-weight:750;min-height:44px;padding:10px 0}
.group-switcher ol{margin:0;padding-left:24px}
.group-switcher a{display:block;padding:10px 4px;line-height:1.6}
.group-switcher a[aria-current]{font-weight:800;color:var(--accent-text)}
.resume-chapter:not([hidden]){display:block;margin:12px 0;padding:10px 0}
.group-progress{height:8px;margin:16px 0 5px;border-radius:999px;background:var(--line);overflow:hidden}
.group-progress span{display:block;height:100%;border-radius:inherit;background:var(--accent);transition:width 300ms ease}
.group-progress-label{margin:0!important;color:var(--muted);font-size:.78rem}
.group-next-hint{margin:8px 0 0!important;color:var(--muted);font-size:.85rem;line-height:1.45}
.chapter-complete-button{margin-top:24px;min-height:44px;padding:9px 14px;border:1px solid var(--line);border-radius:999px;background:transparent;color:var(--ink);font:inherit;font-size:.88rem;font-weight:750;cursor:pointer}
.chapter-complete-button:hover,.chapter-complete-button:focus-visible{border-color:var(--accent);color:var(--accent-text)}
.chapter-complete-button.is-complete{border-color:var(--focus);background:color-mix(in srgb,var(--focus) 10%,transparent);color:var(--focus)}
.chapter-complete{box-shadow:inset 4px 0 var(--focus)}.rich-lesson.chapter-complete{padding-left:22px}@media(max-width:600px){.rich-lesson.chapter-complete{padding-left:14px}}
@media(prefers-reduced-motion:reduce){.group-progress span{transition:none}}
.toc-group-hint{margin:14px 0 0;color:var(--muted);font-size:.82rem;line-height:1.5}
.check-audit-note{margin:0 0 14px;color:var(--muted);font-size:.88rem;line-height:1.55}
@media(max-width:760px){.progress-overview{grid-template-columns:1fr;padding:20px}.progress-overview ol{grid-template-columns:1fr}.progress-overview-item a{grid-template-columns:48px 1fr auto}}

/* 學科紙筆練習 */
.written-page{max-width:1100px}.written-page .section-heading{max-width:900px}.written-page .section-heading a{color:var(--focus);overflow-wrap:anywhere}.written-tabs{margin:0 0 24px;display:flex;flex-wrap:wrap;gap:10px}.written-tabs button{min-height:46px;padding:10px 18px;border:1px solid var(--line);border-radius:999px;background:transparent;color:var(--ink);font-weight:750;cursor:pointer}.written-tabs button.active{border-color:var(--ink);background:var(--ink);color:var(--surface)}.written-panel{min-width:0;padding:clamp(20px,4vw,38px);border:1px solid var(--line);border-radius:var(--radius);background:var(--surface)}.written-panel[hidden]{display:none}.written-panel h2{margin:0 0 8px;font-size:clamp(1.8rem,4vw,2.7rem)}.written-toolbar{display:flex;align-items:start;justify-content:space-between;gap:24px;margin-bottom:20px}.written-toolbar p{margin:0;color:var(--muted)}.written-timer{min-width:136px;padding:10px 15px;border:1px solid var(--line);border-radius:var(--radius-sm);text-align:right}.written-timer span:first-child{display:block;color:var(--muted);font-size:.78rem}.written-timer strong{display:block;font-variant-numeric:tabular-nums;font-size:1.65rem;line-height:1.2}.written-controls{margin:20px 0 26px;display:flex;flex-wrap:wrap;align-items:end;gap:14px}.written-controls>label:not(.written-check){display:grid;gap:5px;font-weight:750}.written-controls select{max-width:100%;min-height:44px;padding:8px 36px 8px 12px;border:1px solid var(--line);border-radius:var(--radius-sm);background:var(--surface);color:var(--ink)}.written-check{min-height:44px;display:flex;align-items:center;gap:7px}.written-stat{margin-bottom:12px;padding:12px 16px;border-radius:var(--radius-sm);background:var(--surface-2);color:var(--muted)}.written-question{min-width:0;margin:28px 0;padding:24px;border:1px solid var(--line);border-radius:var(--radius-sm)}.written-question legend{max-width:100%;padding:0 8px;font-weight:800;line-height:1.7;overflow-wrap:anywhere}.written-source{display:inline-block;margin-left:8px;padding:2px 8px;border-radius:999px;background:var(--surface-2);color:var(--muted);font-size:.72rem;vertical-align:middle}.written-source.is-bank{background:color-mix(in srgb,var(--focus) 14%,var(--surface));color:var(--focus)}.written-options{display:grid;gap:10px;margin-top:8px}.written-options label{min-width:0;padding:12px 14px;display:grid;grid-template-columns:auto minmax(0,1fr);gap:10px;align-items:start;border:1px solid var(--line);border-radius:var(--radius-sm);cursor:pointer}.written-options label:has(input:checked){border-color:var(--focus);background:color-mix(in srgb,var(--focus) 8%,var(--surface))}.written-options label:has(input:disabled){cursor:default}.written-options input{margin-top:.42em}.written-options span{min-width:0;white-space:normal;overflow-wrap:anywhere;word-break:break-word}.written-options b{color:var(--muted)}.written-warning,.written-storage-note{margin:8px 0;padding:9px 12px;border-left:4px solid var(--accent);background:color-mix(in srgb,var(--accent) 10%,var(--surface));overflow-wrap:anywhere}.written-answer{margin-top:16px;padding:14px 16px;border-radius:var(--radius-sm);background:var(--surface-2);overflow-wrap:anywhere}.written-answer p{margin:6px 0 0}.written-question.is-correct{border-color:var(--focus);box-shadow:inset 4px 0 var(--focus)}.written-question.is-wrong{border-color:var(--accent);box-shadow:inset 4px 0 var(--accent)}.written-question[hidden]{display:none}
@media(max-width:1050px){.site-nav{gap:14px}.site-nav a{font-size:.82rem}}
@media(max-width:600px){.written-tabs{display:grid;grid-template-columns:1fr}.written-tabs button{width:100%}.written-toolbar{display:block}.written-timer{width:100%;margin:14px 0;text-align:left}.written-controls{align-items:stretch;flex-direction:column}.written-controls>label:not(.written-check),.written-controls select,.written-controls .button{width:100%}.written-question{margin:22px 0;padding:18px 12px}.written-question legend{padding:0 4px}.written-source{display:table;margin:6px 0 0}.written-panel>.button{width:100%}}
@media(prefers-color-scheme:dark){.written-tabs button.active{background:var(--ink);color:var(--surface)}.written-warning,.written-storage-note{background:#43271f}.written-options label:has(input:checked){background:#20352f}.written-source.is-bank{background:#20352f}}
@media(prefers-reduced-motion:reduce){.written-page *{scroll-behavior:auto!important;transition:none!important;animation:none!important}}
/* 步驟模式（lesson-steps.js） */
.step-hidden,.step-chapter-hidden,.step-tail-hidden{display:none!important}
.step-mode-bar{display:flex;flex-wrap:wrap;align-items:center;gap:8px 10px;margin:0 0 24px;padding:12px 16px;border:1px solid var(--line);border-radius:var(--radius-sm);background:var(--surface-2)}
.step-mode-bar>span:first-child{font-weight:800;margin-right:4px}
.step-mode-bar button{min-height:40px;padding:6px 16px;border:1px solid var(--line);border-radius:999px;background:var(--surface);color:var(--ink);font:inherit;font-weight:700;cursor:pointer}
.step-mode-bar button.is-active{background:var(--ink);border-color:var(--ink);color:var(--surface)}
.step-mode-bar .step-present{margin-left:auto}
.step-mode-note{flex-basis:100%;color:var(--muted);font-size:.9rem}
.step-bar{position:sticky;top:calc(var(--header,76px) + 8px);z-index:2;display:grid;gap:10px;margin:0 0 20px;padding:14px 16px;border:1px solid var(--line);border-radius:var(--radius-sm);background:var(--surface)}
.step-count{display:flex;flex-wrap:wrap;gap:4px 12px;align-items:baseline;margin:0}
.step-count>span:first-child{color:var(--muted);font-size:.92rem}
.step-title{font-size:1.15rem;font-weight:800}
.step-title:focus{outline:none}.step-title:focus-visible{outline:3px solid var(--focus);outline-offset:4px;border-radius:4px}
.step-dots{display:flex;flex-wrap:wrap;gap:8px}
.step-dot{width:34px;height:10px;padding:0;border:0;border-radius:999px;background:var(--line);cursor:pointer}
.step-dot.is-done{background:color-mix(in srgb,var(--accent) 45%,var(--line))}
.step-dot.is-current{background:var(--accent)}
.step-dot:focus-visible{outline:3px solid var(--focus);outline-offset:3px}
.step-footer{margin:26px 0 8px;display:grid;gap:12px}
.step-check{margin:0;padding:14px 16px;border-left:4px solid var(--accent);border-radius:0 var(--radius-sm) var(--radius-sm) 0;background:var(--surface-2)}
.step-check strong{display:block;margin-bottom:2px}
.step-nav{display:flex;flex-wrap:wrap;gap:10px;justify-content:space-between;align-items:center}
.step-nav .button{white-space:normal;text-align:left}
.step-nav button:disabled{opacity:.45;cursor:default}
.step-last{color:var(--muted);font-size:.92rem}
.step-hint{margin:0;color:var(--muted);font-size:.85rem}
.step-screenshot{margin-top:18px}
@media(hover:none){.step-hint{display:none}}
@media(max-width:600px){.step-bar{top:calc(var(--header,68px) + 4px);padding:12px}.step-mode-bar .step-present{display:none}.step-nav{flex-direction:column-reverse;align-items:stretch}.step-nav .button{justify-content:center;text-align:center}}
.rich-lesson:fullscreen{overflow:auto;padding:48px min(6vw,72px);background:var(--bg);font-size:1.3rem}
.rich-lesson:fullscreen .step-bar{position:static}
.rich-lesson:fullscreen .prose{max-width:none;font-size:clamp(1.25rem,1.55vw,1.75rem)}
@media(prefers-reduced-motion:reduce){.step-dot{transition:none}}
/* 截圖放大檢視（screenshot-viewer.js） */
.shot-viewer-open{overflow:hidden}
.shot-viewer{width:min(1400px,100vw - 24px);max-width:none;height:calc(100dvh - 24px);max-height:none;margin:auto;padding:0;border:0;border-radius:14px;background:#111714;color:#edf1ec;display:none;grid-template-rows:auto 1fr auto auto;overflow:hidden}
.shot-viewer[open]{display:grid}
.shot-viewer::backdrop{background:rgb(0 0 0/.72)}
.shot-viewer-bar{display:flex;align-items:center;gap:10px;padding:10px 12px 10px 18px;border-bottom:1px solid rgb(255 255 255/.12)}
.shot-viewer-label{flex:1;min-width:0;margin:0;font-weight:700;overflow-wrap:anywhere}
.shot-viewer-count{color:#aab5af;font-size:.9rem;white-space:nowrap}
.shot-viewer-button{min-height:40px;padding:6px 14px;border:1px solid rgb(255 255 255/.28);border-radius:999px;background:transparent;color:inherit;font:inherit;font-weight:700;cursor:pointer}
.shot-viewer-button:hover{background:rgb(255 255 255/.1)}
.shot-viewer-button:focus-visible{outline:3px solid #88d6c5;outline-offset:2px}
.shot-viewer-close{width:40px;padding:0}
.shot-viewer-stage{overflow:hidden;display:grid;place-items:center;padding:12px;min-height:0;background:#0a0f0d}
.shot-viewer-stage img{max-width:100%;max-height:100%;width:auto;height:auto;object-fit:contain;cursor:zoom-in;border-radius:6px;background:#fff}
.shot-viewer.is-zoomed .shot-viewer-stage{overflow:auto;place-items:start;touch-action:pan-x pan-y}
.shot-viewer.is-zoomed .shot-viewer-stage img{max-width:none;max-height:none;cursor:grab}
.shot-viewer-nav{display:flex;justify-content:center;gap:12px;padding:10px}
.shot-viewer-nav[hidden]{display:none}
.shot-viewer-hint{margin:0;padding:0 16px 12px;text-align:center;color:#aab5af;font-size:.85rem}
@media(max-width:600px){.shot-viewer{width:100vw;height:100dvh;border-radius:0}.shot-viewer-bar{padding:8px 8px 8px 14px}.shot-viewer [data-viewer-zoom]{padding:6px 10px}}
/* 步驟模式的截圖先顯示縮圖（最高半個螢幕），點開再看完整大圖，手機上不用捲很久 */
.step-screenshot .screenshot-shot img{max-height:min(460px,55vh);width:auto;object-fit:contain}
.effects-page{max-width:1320px}.effects-layout{display:grid;grid-template-columns:300px minmax(0,1fr);gap:32px;align-items:start}.effects-index{position:sticky;top:calc(var(--header) + 20px);max-height:calc(100vh - var(--header) - 40px);overflow:auto;padding:4px 8px 4px 0;overscroll-behavior:contain}.effects-index section+section{margin-top:22px}.effects-index h2{display:flex;align-items:baseline;justify-content:space-between;margin:0 0 4px;font-size:1.05rem}.effects-index h2 small{color:var(--muted);font-size:.78rem;font-weight:700}.effects-index>section>p{margin:0 0 8px;color:var(--muted);font-size:.82rem;line-height:1.5}.effects-index ul{margin:0;padding:0;list-style:none;display:grid;gap:4px}.effects-index a{display:block;padding:9px 12px;border:1px solid transparent;border-radius:var(--radius-sm);text-decoration:none}.effects-index a:hover{border-color:var(--line);background:var(--surface)}.effects-index a[aria-current=page]{border-color:var(--ink);background:var(--ink);color:var(--surface)}.effects-index a strong{display:block;font-size:.92rem}.effects-index a span{display:block;color:var(--muted);font-size:.78rem;line-height:1.45}.effects-index a[aria-current=page] span{color:inherit;opacity:.82}
.effect-detail{min-width:0}.effect-detail-head h2{margin:0 0 8px;font-size:clamp(1.8rem,4vw,2.8rem);line-height:1.1;letter-spacing:-.03em}.effect-detail-head>p:not(.kicker){margin:0;color:var(--muted);font-size:1.05rem}.effect-meta{margin:18px 0 0;display:grid;grid-template-columns:1fr 1fr;gap:12px}.effect-meta div{padding:12px 14px;border:1px solid var(--line);border-radius:var(--radius-sm);background:var(--surface)}.effect-meta dt{color:var(--muted);font-size:.78rem;font-weight:800}.effect-meta dd{margin:2px 0 0;font-weight:650}
.effect-stage{margin:22px 0;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;background:#fbfcf8}.effect-stage iframe{display:block;width:100%;border:0;background:#fbfcf8}.effect-stage-bar{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:10px 14px;border-top:1px solid var(--line);background:var(--surface-2);font-size:.9rem;color:var(--muted)}.effect-stage-bar .button{min-height:40px;padding:8px 16px}
.effect-code{border-radius:var(--radius);overflow:hidden;background:#17211d}.effect-code-tabs{display:flex;gap:4px;padding:8px 8px 0}.effect-code-tabs button{padding:8px 14px;border:0;border-radius:8px 8px 0 0;background:transparent;color:#bfc8c3;font-weight:750;cursor:pointer}.effect-code-tabs button[aria-selected=true]{background:#25322d;color:#fff}.effect-code-panel{margin:0;max-height:420px;overflow:auto;padding:18px 20px;background:#25322d;color:#f1f4ed;font-family:"SFMono-Regular",Consolas,monospace;font-size:.84rem;line-height:1.6;tab-size:2}.effect-code-panel[hidden]{display:none}
.effect-actions{margin:14px 0 26px;align-items:center}.effect-copy-note{color:var(--muted);font-size:.85rem}.effect-notes-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px}.effect-notes{padding:18px 20px;border:1px solid var(--line);border-radius:var(--radius);background:var(--surface)}.effect-notes h3{margin:0 0 8px;font-size:1rem}.effect-notes ul{margin:0;padding-left:1.1em;display:grid;gap:8px;font-size:.92rem;line-height:1.65}.effect-notes.is-pitfalls{border-left:5px solid var(--accent)}.effect-notes.is-discuss{border-left:5px solid var(--focus)}.effect-notes code,.effect-meta code{font-size:.85em;overflow-wrap:anywhere}.effect-related{margin-top:22px;color:var(--muted)}.effect-related a{color:var(--focus)}
@media(max-width:1100px){.effect-notes-grid{grid-template-columns:1fr}}
@media(max-width:860px){.effects-layout{grid-template-columns:1fr}.effects-index{position:static;max-height:none;overflow:visible}.effects-index ul{grid-template-columns:repeat(auto-fill,minmax(180px,1fr))}.effect-meta{grid-template-columns:1fr}.effect-stage-bar{flex-direction:column;align-items:stretch}.effect-stage-bar .button{width:100%}}
@media(max-width:860px){.effect-detail{order:-1}.effects-index{margin-top:12px;padding-top:20px;border-top:1px solid var(--line)}}
.glossary-page{max-width:1200px}.glossary-head{display:flex;flex-wrap:wrap;align-items:end;justify-content:space-between;gap:16px;margin:8px 0 16px}.glossary-head h2{margin:0;font-size:clamp(1.6rem,3vw,2.2rem)}.glossary-head h2 small{margin-left:10px;color:var(--muted);font-size:.9rem}.glossary-search{display:grid;gap:4px;font-weight:750}.glossary-search input{min-width:min(320px,80vw);min-height:44px;padding:8px 12px;border:1px solid var(--line);border-radius:var(--radius-sm);background:var(--surface);color:var(--ink);font:inherit}.glossary-group{margin-bottom:28px}.glossary-group[hidden],.glossary-group tr[hidden]{display:none}.glossary-group h3,.glossary-card h3{margin:0 0 8px;font-size:1.15rem}.glossary-page table{width:100%;border-collapse:collapse;font-size:.92rem}.glossary-page th,.glossary-page td{padding:8px 10px;border-bottom:1px solid var(--line);text-align:left;vertical-align:top}.glossary-page td code{overflow-wrap:anywhere}.glossary-page td a{color:var(--focus)}.glossary-cards{margin-top:48px}.glossary-card{margin-bottom:24px;padding:18px 20px;border:1px solid var(--line);border-radius:var(--radius);background:var(--surface)}.glossary-empty{padding:12px 16px;border-left:4px solid var(--accent);background:var(--surface-2)}
@media print{body.print-glossary-cards .site-header,body.print-glossary-cards .site-footer,body.print-glossary-cards .glossary-terms,body.print-glossary-cards .section-heading,body.print-glossary-cards [data-glossary-print]{display:none!important}body.print-glossary-cards .glossary-card{break-inside:avoid;border:1px solid #999}}
.effect-must{display:inline-block;margin-right:6px;padding:1px 8px;border-radius:999px;background:#9b2c1c;color:#fff;font-size:.72em;font-style:normal;font-weight:800;vertical-align:.12em}
.export-status{min-height:1.5em;margin:6px 0 0;color:var(--muted);font-size:.9rem}.export-text{display:grid;gap:6px;margin-top:8px;font-weight:700}.export-text[hidden]{display:none}.export-text textarea{width:100%;padding:10px;border:1px solid var(--line);border-radius:var(--radius-sm);font:inherit;font-weight:400}
.effects-plan{margin:16px 0 0;padding:12px 16px;border:1px solid var(--line);border-radius:var(--radius-sm);background:var(--surface)}.effects-plan summary{cursor:pointer;font-weight:800}.effects-plan table{min-width:560px}.effects-plan td:nth-child(n+3){text-align:center}
@media print{body.print-effects-plan *{visibility:hidden}body.print-effects-plan .effects-plan,body.print-effects-plan .effects-plan *{visibility:visible}body.print-effects-plan .effects-plan{position:absolute;top:0;left:0;width:100%;border:0}body.print-effects-plan [data-effects-print]{display:none}}
.export-name{display:flex;flex-wrap:wrap;align-items:center;gap:8px;margin:10px 0}.export-name label{font-weight:700}.export-name input{min-height:40px;padding:6px 10px;border:1px solid var(--line);border-radius:var(--radius-sm);font:inherit}.restore-button{position:relative;cursor:pointer}.restore-button input{position:absolute;inset:0;opacity:0;cursor:pointer}.restore-button:focus-within{outline:3px solid var(--focus);outline-offset:3px}
/* 章節頁：內容單欄置中；「目錄與進度」改成右側滑出的抽屜 */
.lesson-layout{grid-template-columns:minmax(0,1fr);max-width:980px;margin-inline:auto}
.lesson-side{position:fixed;top:var(--header);right:0;z-index:40;width:min(360px,92vw);max-height:none;height:calc(100dvh - var(--header));overflow:auto;border-radius:var(--radius) 0 0 var(--radius);box-shadow:var(--shadow);transform:translateX(105%);visibility:hidden;transition:transform .25s ease,visibility 0s linear .25s;display:block}
.lesson-side.is-open{transform:none;visibility:visible;transition:transform .25s ease}
.side-close{display:block;margin:0 0 12px auto;padding:6px 12px;border:1px solid var(--line);border-radius:999px;background:var(--surface);color:var(--ink);font:inherit;font-size:.9rem;cursor:pointer}
.side-toggle{position:fixed;right:0;top:calc(var(--header) + 120px);z-index:35;padding:14px 8px;border:1px solid var(--line);border-right:0;border-radius:12px 0 0 12px;background:var(--surface);color:var(--ink);font:inherit;font-weight:800;cursor:pointer;box-shadow:var(--shadow)}
.side-toggle span{writing-mode:vertical-rl;letter-spacing:.15em}
.side-toggle[aria-expanded="true"]{visibility:hidden}
.side-backdrop{position:fixed;inset:var(--header) 0 0 0;z-index:39;background:rgb(23 33 29 / .25)}
.side-backdrop[hidden]{display:none}
.rich-lesson:focus{outline:none}
@media(prefers-reduced-motion:reduce){.lesson-side,.lesson-side.is-open{transition:none}}
@media print{.side-toggle,.lesson-side,.side-backdrop{display:none!important}}
/* 抽屜：本單元各組、目前章、捲動鎖；手機上把手改成右下角圓鈕 */
.unit-toc{margin-top:20px;padding-top:16px;border-top:1px solid var(--line)}.unit-toc h2{font-size:1rem}.unit-toc ol{margin:0;padding:0;list-style:none}.unit-toc a{display:flex;justify-content:space-between;gap:8px;padding:8px 10px;border-radius:var(--radius-sm);color:var(--ink);text-decoration:none}.unit-toc a:hover{background:var(--surface-2)}.unit-toc .is-current a{background:var(--surface-2);font-weight:800}.unit-toc small{color:var(--muted)}
.lesson-toc li.is-current>a{background:var(--surface-2);border-left:4px solid var(--accent);font-weight:800}
body.side-open{overflow:hidden}
@media(max-width:767px){.side-toggle{top:auto;bottom:16px;right:16px;padding:12px 16px;border:1px solid var(--line);border-radius:999px}.side-toggle span{writing-mode:horizontal-tb;letter-spacing:0}.lesson-side{width:100vw;border-radius:0}}
/* 導讀影片下方：開始步驟、全螢幕；字幕在網站裡也保持白字、滿寬 */
.intro-start-row{display:flex;flex-wrap:wrap;align-items:center;gap:12px 20px;padding:14px 20px;border-top:1px solid var(--line)}.intro-full,.intro-mp4{color:var(--focus);font-weight:700}
.chapter-intro .explainer-caption,.explainer .explainer-caption{max-width:none;margin:0;color:#fff}
.export-header{margin:0 0 8px;color:var(--muted);font-size:.9rem}
/* 手機：首頁主視覺不溢出；速查表改成直排卡片 */
@media(max-width:767px){.hero{grid-template-columns:minmax(0,1fr)}.hero-copy{min-width:0}.hero-copy h1{font-size:clamp(2rem,9vw,3rem);overflow-wrap:anywhere}
.glossary-page table{min-width:0}.glossary-page thead{display:none}.glossary-page tr{display:grid;grid-template-columns:minmax(0,1fr);gap:2px;padding:10px 0;border-bottom:1px solid var(--line)}.glossary-page td{padding:0;border:0}.glossary-page td:first-child{font-weight:800}}
/* 章節頁單欄：說明、程式碼和導讀影片同一個左緣、同一個寬度 */
.lesson-layout .rich-lesson .prose{width:100%;max-width:none;margin-left:0}
.lesson-section{scroll-margin-top:calc(var(--header) + 12px)}
/* 2026-10-09 UX 第二批：步驟模式留白、步驟列縫隙、單步章、程式碼框、單元開始鈕、手機影片全螢幕 */
.is-step-mode .rich-lesson{padding-top:36px}.is-step-mode .chapter-heading{margin-bottom:28px}
.step-bar{box-shadow:0 -10px 0 var(--bg)}.step-bar.is-single{position:static;box-shadow:none}.step-bar.is-single .step-count>span:first-child{color:var(--muted);font-size:.85rem}
.code-box{position:relative;margin:1.4em 0}.code-box>pre{margin:0}.code-box.is-collapsed>pre{max-height:34em;overflow:hidden;-webkit-mask-image:linear-gradient(#000 78%,transparent);mask-image:linear-gradient(#000 78%,transparent)}
.code-tools{display:flex;flex-wrap:wrap;justify-content:flex-end;gap:8px;margin-top:8px}.code-tool{min-height:36px;padding:6px 14px;border:1px solid var(--line);border-radius:999px;background:var(--surface);color:var(--ink);font-size:.85rem;font-weight:700;cursor:pointer}.code-tool:hover{border-color:var(--ink)}
.unit-start{display:flex;flex-wrap:wrap;align-items:center;gap:10px 16px;margin:8px 0 0}.unit-start .button{white-space:normal;text-align:left;line-height:1.4}.unit-start-note{color:var(--muted);font-size:.92rem}
@media(max-width:760px){.is-step-mode .rich-lesson{padding-top:24px}.is-step-mode .chapter-heading{margin-bottom:20px}.reading-layout .lesson-hero{padding-bottom:32px}.reading-layout .outcome-grid{margin:24px 0 0;gap:8px}.reading-layout .outcome{padding:14px 16px}.reading-layout .outcome p{margin:4px 0 0}.intro-full{display:inline-flex;min-height:44px;align-items:center;padding:8px 16px;border:1px solid var(--focus);border-radius:999px}.intro-start-row .button{flex:1 1 100%;white-space:normal}}
/* 手機：「目錄」放進頁首（選單按鈕左邊），不再浮在內容上蓋住按鈕 */
.side-toggle-short{display:none}
@media(max-width:767px){.side-toggle{top:12px;bottom:auto;right:108px;height:44px;padding:0 14px;box-shadow:none;background:var(--surface)}.side-toggle-long{display:none}.side-toggle-short{display:inline}}
.code-tool-note{align-self:center;color:var(--muted);font-size:.82rem}
.recall-card{margin:1.4em 0;padding:14px 18px;border:1px solid var(--line);border-radius:var(--radius-sm);background:var(--surface)}.recall-card>summary{cursor:pointer;font-weight:800}.recall-card pre{font-size:.82rem;line-height:1.35}.recall-card h4{margin:1.2em 0 .4em}
@media print{body:has(.recall-card[open]) .recall-card{border:0}}

/* 對比修正：深色模式時固定淺色底的區塊（導讀影片、作品預覽、單元標籤）內部改回淺色模式的文字色 */
.chapter-intro,.work-preview,.lesson-index{--ink:#17211d;--muted:#4f5a55;--focus:#116e5d;--line:#cbd3ce;--surface:#fbfcf8;--surface-2:#e9eee8;--accent-text:#b4402a;color:#17211d}
.preview-caption{color:#4f5a55}
@media(prefers-color-scheme:dark){:root{--accent-text:#f08a72}.site-footer{color:#edf1ec}.chapter-intro{--ink:#edf1ec;--muted:#aab5af;--focus:#88d6c5;--line:#3d4943;--surface:#18201c;--surface-2:#222d28;--accent-text:#f08a72;background:var(--surface-2);border-color:var(--line);color:var(--ink)}.chapter-intro>summary span{color:var(--muted)}.chapter-intro[open]>summary{border-bottom-color:var(--line)}}
.preview-toolbar{color:#46514c}
@media(prefers-color-scheme:dark){.feature-band b{color:#b4402a}}
@media(max-width:600px){.step-nav .button{white-space:normal;line-height:1.35}}
/* 手機：課程表格一列一張卡片，欄名寫在每格前面，不必橫向捲動 */
@media(max-width:600px){.table-wrap:has(.stack-table){overflow:visible;border:0;background:transparent}.prose .stack-table{min-width:0;background:transparent}.stack-table,.stack-table tbody,.stack-table tr,.stack-table td{display:block;width:100%}.stack-table thead{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0)}.stack-table tr{margin:0 0 10px;padding:10px 14px;border:1px solid var(--line);border-radius:var(--radius-sm);background:var(--surface)}.stack-table td{padding:4px 0;border:0}.stack-table td[data-label]::before{content:attr(data-label) "：";font-weight:800;color:var(--ink)}}
.step-map-link{align-self:center;color:var(--focus);font-weight:700}
/* 章名：章號改成小膠囊，和組名同一行；章名獨佔一行、拿掉左邊空出來的欄 */
.chapter-heading{grid-template-columns:auto minmax(0,1fr);column-gap:10px;row-gap:8px;align-items:center}
.chapter-heading>div{display:contents}
.chapter-heading>span{grid-column:1;grid-row:1;padding:3px 10px;border-radius:999px;background:var(--surface-2);color:var(--accent-text);font-size:.78rem;line-height:1.4;letter-spacing:.04em;white-space:nowrap}
.chapter-heading>span::before{content:"單元 " attr(data-unit) "・第 "}.chapter-heading>span::after{content:" 章"}
.chapter-heading p{grid-column:2;grid-row:1;margin:0}
.chapter-heading h2{grid-column:1/-1;grid-row:2;font-size:clamp(1.9rem,3vw,2.8rem)}
/* 步驟列：一列就好：步驟膠囊、步驟標題、右邊進度點 */
.step-bar{grid-template-columns:minmax(0,1fr) auto;align-items:center;gap:6px 16px;padding:10px 14px}
.step-count{flex-wrap:nowrap;align-items:center;gap:10px;min-width:0}
.step-count>span:first-child{flex:none;padding:2px 10px;border-radius:999px;background:var(--surface-2);color:var(--ink);font-size:.82rem;font-weight:700;white-space:nowrap}
.step-title{min-width:0;font-size:1.05rem;line-height:1.35;display:-webkit-box;-webkit-box-orient:vertical;-webkit-line-clamp:2;overflow:hidden}
.step-dots{flex-wrap:nowrap;gap:6px}
.step-dot{width:22px;height:8px}
.step-bar.is-single{grid-template-columns:minmax(0,1fr)}
@media(max-width:600px){.chapter-heading{grid-template-columns:auto minmax(0,1fr)}.chapter-heading h2{font-size:clamp(1.6rem,7vw,2.1rem)}.step-bar{padding:8px 12px;gap:6px 10px}.step-title{font-size:.98rem}.step-dot{width:16px}}
@media(max-width:420px){.brand strong{font-size:.82rem}}
.code-wrap-toggle{display:none}.code-wrap-toggle[aria-pressed="true"]{background:var(--ink);color:var(--surface);border-color:var(--ink)}
.code-box.is-wrapped>pre{white-space:pre-wrap;overflow-wrap:anywhere}
.code-box.is-wrapped .code-line{display:block;padding-left:2ch;text-indent:-2ch}
.code-box.is-wrapped .code-line:nth-child(even){background:color-mix(in srgb,currentColor 7%,transparent)}
@media(max-width:600px){.code-wrap-toggle{display:inline-flex;align-items:center}.code-tools{justify-content:flex-start}}
.lead-block>pre{margin-top:.6em}
/* 速查：白話解釋放前面，英文寫法縮小、變淡（零基礎學生先看中文） */
.glossary-terms td:nth-child(2) code{color:var(--muted);font-size:.85em;background:none;padding:0}
.glossary-terms td:nth-child(3){color:var(--ink)}
@media(max-width:760px){.glossary-terms tr{display:flex;flex-direction:column}.glossary-terms td{border-bottom:0;padding:2px 10px}.glossary-terms tr{padding:8px 0;border-bottom:1px solid var(--line)}.glossary-terms td:nth-child(3){order:1}.glossary-terms td:nth-child(2){order:2}.glossary-terms td:nth-child(2) code::before{content:"英文："}.glossary-terms td:nth-child(4){order:3}}
.step-left{flex:none;color:var(--muted);font-size:.8rem;white-space:nowrap}
@media(max-width:600px){.step-count{flex-wrap:wrap}.step-left{flex-basis:100%}}
/* 手機上步驟很多（7 步以上）時，進度點放到第二行，標題不被擠斷 */
@media(max-width:600px){.step-bar.is-many{grid-template-columns:minmax(0,1fr)}.step-bar.is-many .step-dots{flex-wrap:wrap}}
.skip-test{margin:14px 0 0;padding:10px 14px;border:1px dashed var(--line);border-radius:var(--radius-sm);background:var(--surface)}.skip-test summary{cursor:pointer;font-weight:750}.teacher-link{font-size:.92rem;color:var(--muted)}
.tip-block details{margin-top:6px}.tip-block summary{cursor:pointer;color:var(--focus);font-weight:700}.export-help{margin:10px 0 0}.export-help summary{cursor:pointer;color:var(--focus);font-weight:700;font-size:.92rem}
.resume-all{display:flex;flex-wrap:wrap;align-items:center;gap:8px 14px;margin:12px 0}.resume-all .button{white-space:normal;text-align:left}.resume-all span{color:var(--muted);font-size:.9rem}
.export-readable{display:block;margin-bottom:8px;padding:10px 12px;border-radius:var(--radius-sm);background:var(--surface-2);color:var(--ink);font-weight:600;line-height:1.6}
.home-return{margin-top:14px;color:var(--muted);font-size:.92rem}.home-return a{color:var(--focus);font-weight:700}
.practice-where{display:block;margin:10px 0 2px;padding:10px 14px;border-left:4px solid var(--focus);border-radius:0 var(--radius-sm) var(--radius-sm) 0;background:var(--surface-2);color:var(--ink);font-size:.95rem;line-height:1.7}
.practice-warn{display:block;margin-top:6px;color:var(--accent-text);font-weight:700}
/* 桌機右側「目錄與進度」把手：加箭頭和強調色邊，比較不會被忽略 */
@media(min-width:768px){.side-toggle{border-color:var(--focus);border-width:2px}.side-toggle-long::before{content:"◂ ";}}
/* 手機：導讀影片控制鈕間距加大，避免誤觸 */
@media(max-width:600px){.explainer-controls{gap:10px!important}.explainer-controls button{min-height:40px}}
.folder-map code{white-space:nowrap}.folder-map-link{font-size:.88rem;color:var(--focus);white-space:nowrap}
/* 手機觸控與字級（第十輪）：進度點加大可點範圍、單選鈕放大、小標籤字級提高、頁尾與選單連結加高 */
.step-dot{position:relative}.step-dot::after{content:"";position:absolute;inset:-18px -3px}
.written-options input{width:18px;height:18px}
.written-source,.preview-toolbar,.lesson-toc a>span:first-child,.toc-status{font-size:.8rem}
@media(max-width:760px){.site-footer a,.site-nav a{display:inline-flex;align-items:center;min-height:44px}.skip-test a,.unit-start-note a{display:inline-block;padding:6px 0}}
.effects-must-only{display:flex;align-items:center;gap:8px;margin:0 0 14px;padding:10px 12px;border:1px solid var(--line);border-radius:var(--radius-sm);background:var(--surface);font-weight:750;cursor:pointer}.effects-must-only input{width:18px;height:18px}
.effects-index.is-must-only li:not([data-must]){display:none}.effects-index.is-must-only section:not(:has(li[data-must])){display:none}
.recall-part{margin:8px 0;border:1px solid var(--line);border-radius:var(--radius-sm);padding:6px 12px}.recall-part>summary{cursor:pointer;font-weight:750}
.effect-detail{scroll-margin-top:84px}@media(max-width:600px){.effect-code-panel{white-space:pre-wrap;overflow-wrap:anywhere}}
.code-box{scroll-margin-top:84px}
.type-help{margin-top:8px;border:1px solid var(--line);border-radius:12px;background:var(--surface);color:var(--ink);font-size:.92rem}.type-help>summary{padding:10px 14px;font-weight:700;cursor:pointer}.type-help ol{margin:0;padding:0 18px 12px 36px;line-height:1.7}.type-help li+li{margin-top:4px}
.optional-note{margin:0 0 20px;padding:12px 16px;border-left:4px solid var(--line);background:var(--surface-2,rgba(0,0,0,.03));border-radius:8px;color:var(--muted)}
.optional-next{display:block;margin-top:8px;font-size:.95em}
.unit-handoff{display:block;margin-bottom:8px;color:var(--ink);font-weight:650}
.code-pair-label{margin:16px 0 6px;font-weight:700;color:var(--ink)}
@media(max-width:480px){.step-next-title{display:none}}
.drill-timer{position:sticky;top:calc(var(--header) + 8px);z-index:5;margin:0 0 20px;padding:12px 16px;border:1px solid var(--line);border-radius:var(--radius-sm);background:var(--surface)}.drill-timer-label{margin:0 0 6px;font-size:.85rem;color:var(--muted)}.drill-timer-row{display:flex;flex-wrap:wrap;align-items:center;gap:12px}.drill-timer-clock{font-variant-numeric:tabular-nums;font-size:2rem;line-height:1}.drill-timer-presets,.drill-timer-actions{display:flex;flex-wrap:wrap;gap:6px}.drill-timer-presets [aria-pressed=true]{background:var(--ink);color:var(--surface)}.drill-timer.is-done .drill-timer-clock{color:var(--accent-text)}
@media(max-width:600px){.drill-timer{position:static}.drill-timer-clock{font-size:1.6rem}}
.step-handoff{margin:12px 0;padding:12px 16px;border-left:4px solid var(--accent);background:var(--surface-2);border-radius:8px;font-weight:650;color:var(--ink)}.step-optional{margin:8px 0;color:var(--muted);font-size:.95em}
body.side-open .chapter-complete-button{visibility:hidden}
.drill-timer.is-running{position:fixed;left:50%;right:auto;top:auto;bottom:12px;transform:translateX(-50%);z-index:30;margin:0;padding:8px 12px;box-shadow:var(--shadow);width:max-content;max-width:calc(100% - 24px)}.drill-timer.is-running .drill-timer-label,.drill-timer.is-running .drill-timer-presets{display:none}.drill-timer.is-running .drill-timer-clock{font-size:1.5rem}.drill-timer.is-running .button{min-height:44px;padding:8px 16px}
@media(max-width:600px){.step-map-link{order:-1}.ascii-art{font-size:2.3vw;line-height:1.3}}
.code-box+.code-pair-label{margin-top:28px}
.button:disabled,.button[disabled]{opacity:.5;cursor:not-allowed;filter:grayscale(.5)}
.effects-jump{display:none}@media(max-width:860px){.effects-jump{display:inline-flex;min-height:44px;margin:0 0 10px;padding:8px 14px;border:1px solid var(--line);border-radius:999px;background:var(--surface);color:var(--ink);font:inherit;font-weight:700;cursor:pointer}.effects-index{scroll-margin-top:84px}}
.type-compare{margin-top:8px;border:1px solid var(--line);border-radius:12px;background:var(--surface);color:var(--ink);font-size:.92rem}.type-compare>summary{padding:10px 14px;font-weight:700;cursor:pointer}.type-compare>p{margin:0 14px 8px}.type-compare textarea{display:block;width:calc(100% - 28px);margin:0 14px 8px;box-sizing:border-box;font:13px/1.5 ui-monospace,Menlo,Consolas,monospace;padding:8px;border:1px solid var(--line);border-radius:8px;background:var(--card);color:var(--ink)}.type-compare-result{margin:0 14px 12px;line-height:1.7}.type-compare-result:empty{display:none}.type-compare-result.is-ok,.type-compare-result.is-partial{color:var(--accent-text)}.type-compare-result.is-bad{border-left:4px solid var(--accent);padding-left:10px}.type-compare-result code{white-space:pre-wrap;word-break:break-all}
/* 首頁大標：字級跟著左欄寬度縮，整句放得下就一行；放不下時在 <wbr> 換行，句號不會被擠到右邊的預覽圖底下 */
.hero-copy{container-type:inline-size;min-width:0}.hero h1{font-size:min(clamp(3.5rem,4.6vw,5.25rem),8.4cqi)}@media(max-width:760px){.hero h1{font-size:min(clamp(3rem,14vw,4.25rem),15cqi)}}
.section-heading h1,.section-heading h2,.feature-band h2,.lesson-card h3{line-height:1.12}

/* 首頁：有進度時，一鍵回到上次那一章 */
.home-resume{margin:0 0 20px}.home-resume .button{max-width:100%;white-space:normal;text-align:left}
/* 只在手機（觸控、窄螢幕）顯示：哪些檢查要回到電腦做 */
.phone-note{display:none}
@media(hover:none) and (max-width:700px){.phone-note{display:block;margin:12px 0 0;padding:10px 14px;border-left:4px solid var(--accent);background:var(--surface);font-size:.95rem}}
/* 深色模式時練習建議框是淺底：小標改深橘，對比才夠 */
@media(prefers-color-scheme:dark){.challenge-box .kicker{color:#9a3420}}
/* 首頁大標：句號不單獨掉到下一行 */
.hero h1 .nowrap{display:inline;white-space:nowrap;font-weight:inherit;color:inherit}
/* 特效庫：回到剛剛讀的章節 */
.effects-back{margin:0 0 16px}.effects-back a{display:inline-flex;align-items:center;min-height:44px;font-weight:700}
/* 觸控螢幕：「查看答案」這類可展開的摘要列至少 44px 高，手指點得到 */
@media(hover:none){.prose details>summary{min-height:44px;padding-block:10px;box-sizing:border-box}}
/* 學科作答回饋：答錯時自己選的那個是紅色，正確答案綠色並標「正確答案」 */
.written-question.is-wrong .written-options label:has(input:checked){border-color:#b42318;background:#fde4df}
.written-question .written-options label.is-answer{border-color:#1f7a4d;background:#dff1e6}
.written-question .written-options label.is-answer span::after{content:"　✓ 正確答案";color:#1f7a4d;font-weight:800}
@media(prefers-color-scheme:dark){.written-question.is-wrong .written-options label:has(input:checked){border-color:#ff8a78;background:#4a2420}.written-question .written-options label.is-answer{border-color:#6fd39a;background:#1d3a2a}.written-question .written-options label.is-answer span::after{color:#6fd39a}}
/* 程式碼比框寬時（不只手機）：顯示「自動換行」和左右滑的提示；換行後提示收起來 */
.code-scroll-hint{display:none;color:var(--muted);font-size:.82rem}
.code-box.has-overflow .code-wrap-toggle,.code-box.is-wrapped .code-wrap-toggle{display:inline-flex;align-items:center}
.code-box.has-overflow:not(.is-wrapped) .code-scroll-hint{display:inline}
/* 平板直向（768～1199px）：右緣的「目錄與進度」分頁會蓋到內文最右邊，內容區右邊讓出分頁的寬度 */
@media(min-width:768px) and (max-width:1199px){.reading-layout{padding-right:48px}}

/* 平板也顯示「要回電腦做」的提醒 */
@media(hover:none) and (min-width:701px){.phone-note{display:block;margin:12px 0 0;padding:10px 14px;border-left:4px solid var(--accent);background:var(--surface);font-size:.95rem}}
/* 觸控螢幕：比對工具的輸入框 16px，iPad／iPhone 點進去不會自動放大整頁 */
@media(hover:none){.type-compare textarea{font-size:16px}}
/* 「展開全部」後捲回程式碼開頭：讓開頁首和步驟列，第一行不會被蓋住 */
.is-step-mode .code-box{scroll-margin-top:calc(var(--header) + 110px)}
/* 特效庫的「回到剛剛讀的章節」固定在左下角，一進來就看得到 */
.effects-back{position:fixed;left:16px;bottom:16px;z-index:30;margin:0}.effects-back a{padding:0 18px;border-radius:999px;background:var(--ink);color:var(--surface);text-decoration:none;box-shadow:var(--shadow)}
/* 提示泡泡加框線：疊在深色頁尾上也看得清楚 */
[data-toast]{border:2px solid var(--surface)}
.written-why small{display:block;margin-top:4px;color:var(--muted);font-size:.8rem}
.written-check-row{display:flex;flex-wrap:wrap;align-items:center;gap:8px 12px;margin:10px 0 0;color:var(--muted);font-size:.88rem}
/* 網路慢時：內容出來前先佔住畫面高度並顯示「載入中」，頁尾不會先擠上來再被推下去 */
#app{min-height:calc(100vh - var(--header))}
.loading-note{margin:0;padding:48px 20px;color:var(--muted);text-align:center}

/* 深色模式：導讀影片外框是淺底，焦點框改深綠才看得到 */
.chapter-intro :focus-visible{outline-color:#116e5d}
/* 導讀目前幕次的圓鈕：深一點的珊瑚色，白字對比夠 */
.explainer-dots button[aria-current]{background:#b8432d;border-color:#b8432d}

/* 學科：計時與交卷鈕跟著捲動（40 題很長，作答中也看得到剩餘時間） */
.written-timer .label-short{display:none}.written-wrong-hint{display:inline;margin-left:6px;color:var(--muted);font-size:.85rem}.written-sticky{position:sticky;top:calc(var(--header) + 6px);z-index:4;display:flex;flex-wrap:wrap;align-items:center;gap:10px 16px;margin:0 0 16px;padding:8px 12px;border:1px solid var(--line);border-radius:var(--radius-sm);background:var(--surface)}
.written-sticky .button-row{gap:8px}.written-sticky .button{min-height:44px;padding:8px 16px}
.written-score-bar{display:flex;align-items:center;gap:12px;font-weight:800}
.written-sticky.is-done{position:static}
@media (max-width:900px){.written-sticky{top:calc(var(--header) + 4px)}}
/* 開考前只顯示開始、開考後只顯示交卷（避免窄螢幕兩顆上下疊被裁切） */
.written-sticky:not(.is-running):not(.is-done) [data-simulation-submit]{display:none!important}
.written-sticky.is-running [data-simulation-start]{display:none!important}
.written-sticky [data-simulation-actions][hidden]{display:none!important}
@media (max-width:760px){
  .written-sticky{flex-wrap:nowrap;align-items:center;gap:8px;padding:6px 10px;min-height:0;max-height:56px;overflow:hidden}
  .written-sticky .written-timer{min-width:0;padding:4px 8px;border:0}
  .written-sticky .written-timer .label-long{display:none}.written-sticky .written-timer .label-short{display:inline}
  .written-sticky .written-timer strong{font-size:1.25rem;line-height:1}
  .written-sticky .button-row{flex:0 0 auto;justify-content:flex-end;min-width:0;flex-wrap:nowrap;gap:0}
  .written-sticky .button{min-height:40px;padding:6px 12px;font-size:.9rem;line-height:1.2}
  .written-sticky.is-done{max-height:none;overflow:visible;flex-wrap:wrap}
  .written-sticky.is-done [data-simulation-actions]{display:none!important}
}

/* 第 27 輪：手機閱讀與學科的小修 */
.step-bar.is-compact .step-dots,.step-bar.is-compact .step-left{display:none}
.step-bar.is-compact{padding-top:6px;padding-bottom:6px}
.step-bar.is-compact .step-count{flex-wrap:nowrap}.step-bar.is-compact .step-title{-webkit-line-clamp:1}
.step-dot{position:relative}.step-dot::before{content:"";position:absolute;inset:-12px -3px}
@media (hover:none),(pointer:coarse){.step-hint{display:none}}
.unit-start-here{color:var(--muted)}.unit-start-here a{color:var(--accent-text);font-weight:700}
.written-start-note{margin:0 0 12px;color:var(--muted)}
.written-question legend{float:left;width:100%;padding:0;margin-bottom:10px}.written-question legend+*{clear:both}
.effects-missing{padding:12px 16px;border-left:4px solid var(--accent);background:var(--surface)}
@media(max-width:600px){.effect-code-panel .code-line{display:block;padding-left:2ch;text-indent:-2ch}.effect-code-panel .code-line:nth-child(even){background:rgb(255 255 255/.06)}}


.toc-film{margin-left:6px;color:var(--accent-text);font-size:.75rem;font-weight:800}
.effect-scroll-hint{margin:0;padding:6px 12px;background:#17211d;color:#fff;font-size:.85rem;font-weight:700;text-align:center}
.effect-stage{position:relative}

/* sim31：手機導覽可點文字 ≥14px；單元前提示；提醒框 */
@media(max-width:1050px){.site-nav a{font-size:.875rem}}
.unit-prereq{margin:12px 0 0;padding:10px 14px;border-left:4px solid var(--focus);background:var(--surface);font-size:.95rem}
.lesson-note.is-alert{border-left:5px solid var(--accent);background:color-mix(in srgb,var(--accent) 10%,var(--surface))}
/* M1／L9：還原手機導讀內容；改在導讀上方放「略過導讀，開始步驟」，不藏程式碼／幕點、不縮舞台、不裁字幕 */
.intro-skip-row{display:none;margin:0;padding:10px 16px 0;border-top:1px solid var(--line)}
.intro-skip{display:inline-flex;align-items:center;justify-content:center;min-height:44px;padding:8px 16px;border:1px solid var(--focus);border-radius:999px;background:var(--surface);color:var(--focus);font-weight:750;cursor:pointer;text-align:center}
@media(max-width:430px){
  .intro-skip-row{display:block}
  .intro-skip{width:100%;box-sizing:border-box}
}
/* 第 3 章入口較長：寬螢幕維持單行，避免既有選單被擠成逐字換行。920px 以下維持原換行，以免 768 橫向溢出。 */
@media(min-width:920px){.site-nav a{white-space:nowrap}}