/* =========================================================
   ui03.html「Figma 基本功能練習」專用樣式  v1
   從 ui02-04 的第一個 Frame 開始，帶學生一路做出登入頁、註冊頁、Chat 頁與底部選單，
   邊做邊認識 Figma 的核心功能：Frame、組件（Components）、樣式（Styles）、變數（Variables）、原型（Prototype）。
   沿用 ui04 的視覺語言（Tiffany Blue／Figma Agent 紫），只在 .ui03-page 之下擴充，不影響全站 main.css。
   ========================================================= */
.ui03-page {
	--u-ink: #1B1F22;
	--u-ink-2: #4B5563;
	--u-ink-3: #8A9199;
	--u-paper: #ffffff;
	--u-bg: #F2FBFA;
	--u-line: #D8EEEC;
	--u-brand: #0ABAB5;       /* Tiffany Blue：結構性主色 */
	--u-brand-strong: #067A76;
	--u-brand-soft: #DFF6F4;
	--u-agent: #6350C4;       /* Figma Agent／變數識別色 */
	--u-agent-soft: #EDE9FB;
	--u-figjam: #EE4A85;      /* 提醒／小技巧識別色 */
	--u-figjam-soft: #FDF2F6;
	--u-warn: #E4572E;
	--u-good: #1E9E6B;
	--u-dot: #D3EFEC;
	--u-select: var(--u-brand);
	--u-select-soft: rgba(10,186,181,.1);
	--u-font-display: "Chiron GoRound TC", "Noto Sans TC", "PingFang TC", "Microsoft JhengHei", system-ui, sans-serif;
	--u-font-mono: "JetBrains Mono", ui-monospace, "SF Mono", Menlo, Consolas, monospace;
	--r: 20px;
	background-color: var(--u-bg);
	background-image: radial-gradient(var(--u-dot) 1px, transparent 1.2px);
	background-size: 22px 22px;
	color: var(--u-ink);
	font-family: "Noto Sans TC", "PingFang TC", "Microsoft JhengHei", sans-serif;
	font-size: 16px;
	line-height: 1.75;
	padding-bottom: 100px;
	overflow-x: clip;
	--hdr: 84px;
	line-break: strict;
	word-break: normal;
	overflow-wrap: normal;
}
.ui03-page h2, .ui03-page h3, .ui03-page h4 { font-family: var(--u-font-display); }
.ui03-page :is(p, li, .fig-step-text, .fig-def, .fig-tip, .fig-note, dd, dt, figcaption, h2, h3, h4) { line-break: strict; word-break: normal; overflow-wrap: normal; }
/* overflow-wrap:break-word／anywhere 會為了不溢位而強制打斷，連中文標點的避頭點規則都會被蓋過去，
   造成標點跑到行首、詞語被硬拆成怪異的斷行。頁面上所有連結顯示的都是完整詞語（沒有裸網址），
   所以中文內文與連結文字都不需要它，全部維持 normal，讓瀏覽器內建的中文斷行規則生效即可。 */
.ui03-page *, .ui03-page *::before, .ui03-page *::after { box-sizing: border-box; }
.ui03-page img { max-width: 100%; display: block; }
.ui03-page a { text-decoration: none; }
.ui03-page p { font-size: 16px; line-height: 1.8; color: var(--u-ink-2); }
.ui03-wrap { max-width: 1240px; margin: 0 auto; padding: 0 24px; }
.ui03-mono { font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace; letter-spacing: .13em; text-transform: uppercase; font-size: 12px; font-weight: 700; }

/* ---------- 頁內選單 ---------- */
.ui03-subnav { position: sticky; top: var(--hdr); z-index: 90; background: rgba(242,251,250,.94); backdrop-filter: blur(8px); border-bottom: 1px solid var(--u-line); }
.ui03-subnav .ui03-wrap { display: flex; gap: 2px; overflow-x: auto; scrollbar-width: none; padding-top: 2px; padding-bottom: 2px; }
.ui03-subnav .ui03-wrap::-webkit-scrollbar { display: none; }
.ui03-subnav a { position: relative; flex: 0 0 auto; display: flex; align-items: baseline; gap: 7px; padding: 14px 14px 12px; color: var(--u-ink-3); white-space: nowrap; font-size: 13.5px; font-weight: 700; transition: color .2s; }
.ui03-subnav a .no { font: 900 12px/1 "JetBrains Mono", ui-monospace, Menlo, monospace; opacity: .55; }
.ui03-subnav a::after { content:""; position:absolute; left:14px; right:14px; bottom:-1px; height:3px; border-radius:3px 3px 0 0; background:var(--u-brand); transform:scaleX(0); transform-origin:left; transition:transform .3s cubic-bezier(.2,.8,.2,1); }
.ui03-subnav a:hover { color: var(--u-ink); }
.ui03-subnav a.is-on { color: var(--u-ink); }
.ui03-subnav a.is-on .no { opacity: 1; color: var(--u-brand-strong); }
.ui03-subnav a.is-on::after { transform: scaleX(1); }
.ui03-page section[id] { scroll-margin-top: calc(var(--hdr) + 64px); }

/* ---------- 開場 ---------- */
.ui03-intro { padding: 56px 0 36px; display: grid; grid-template-columns: minmax(0,1.3fr) minmax(0,.7fr); gap: 44px; align-items: end; }
.ui03-intro .ui03-mono { color: var(--u-brand-strong); display:flex; align-items:center; gap:10px; }
.ui03-intro .ui03-mono::before { content:""; width:26px; height:2px; background:currentColor; }
.ui03-intro h2 { font-size: clamp(28px,4vw,46px); line-height:1.16; font-weight:900; margin:16px 0 0; letter-spacing:-.01em; color:var(--u-ink); }
.ui03-intro h2 em { font-style:normal; background: linear-gradient(transparent 62%, var(--u-brand-soft) 62%); padding:0 .06em; color: var(--u-brand-strong); }
.ui03-strap { margin:14px 0 0; font-size:16.5px; font-weight:800; color:var(--u-ink); }
.ui03-strap .s1 { color:var(--u-brand-strong); }
.ui03-strap .s2 { color:var(--u-agent); }
.ui03-intro p.lead { font-size:16.5px; line-height:1.85; color:var(--u-ink-2); margin:18px 0 0; max-width:44em; }
.ui03-stats { display:grid; grid-template-columns:repeat(4,1fr); border-top:2px solid var(--u-ink); }
.ui03-stats div { padding:14px 10px 0 0; }
.ui03-stats .stat-number { display:block; font-size:clamp(26px,3.2vw,38px); font-weight:900; line-height:1; font-variant-numeric:tabular-nums; color:var(--u-ink); }
.ui03-stats span.lbl { display:block; margin-top:6px; font-size:12px; color:var(--u-ink-2); line-height:1.5; }
.ui03-updated { margin-top:18px; font-size:12.5px; color:var(--u-ink-3); }

/* ---------- 案例名片 ---------- */
.case-chip { display:flex; align-items:center; gap:14px; background:var(--u-paper); border:1.5px solid var(--u-brand); border-radius:16px; padding:16px 20px; box-shadow:0 14px 30px -20px rgba(10,186,181,.5); }
.case-chip .mark { width:48px; height:48px; border-radius:12px; background:var(--u-brand); color:#fff; display:grid; place-items:center; font-size:20px; font-weight:900; flex:none; }
.case-chip b { display:block; font-size:15px; }
.case-chip span { display:block; font-size:12px; color:var(--u-ink-3); margin-top:2px; }

/* ---------- 跑馬燈 ---------- */
.ui03-marquee { border-block:2px solid var(--u-ink); background:var(--u-ink); color:#fff; overflow:hidden; white-space:nowrap; margin:20px 0 48px; }
.ui03-marquee-track { display:inline-flex; animation: ui03Marquee 30s linear infinite; padding:12px 0; }
.ui03-marquee span { font-size:clamp(17px,2.2vw,24px); font-weight:900; padding:0 24px; display:inline-flex; align-items:center; gap:24px; }
.ui03-marquee span::after { content:"✦"; font-size:.6em; color:var(--u-brand); }
.ui03-marquee span.o { color:transparent; -webkit-text-stroke:1.1px #fff; }
@keyframes ui03Marquee { to { transform: translateX(-50%); } }
@media (prefers-reduced-motion: reduce) { .ui03-marquee-track { animation:none; } }

.ui03-notes-grid { display:grid; grid-template-columns:1fr; gap:16px; }
@media (min-width:701px) { .ui03-notes-grid { grid-template-columns:repeat(2,minmax(0,1fr)); align-items:start; } }
.ui03-note { font-size:14px; line-height:1.8; background:var(--u-brand-soft); border-radius:10px; padding:14px 18px; margin-top:16px; color:var(--u-ink-2); }
.ui03-notes-grid .ui03-note { margin-top:0; height:100%; }
.ui03-note > b:first-child { color:var(--u-brand-strong); font-family:"JetBrains Mono",ui-monospace,Menlo,monospace; font-size:10px; text-transform:uppercase; letter-spacing:.05em; display:block; margin-bottom:5px; }
.ui03-note b { color:var(--u-ink); font-weight:700; }
.ui03-note.agent { background:var(--u-agent-soft); }
.ui03-note.agent > b:first-child { color:var(--u-agent); }

.ui03-section-head { display:flex; align-items:baseline; justify-content:space-between; gap:16px; flex-wrap:wrap; margin:0 0 26px; padding-bottom:14px; border-bottom:1px solid var(--u-line); }
.ui03-section-head h3 { margin:0; font-size:clamp(22px,2.8vw,32px); font-weight:900; color:var(--u-ink); }
.ui03-section-head p { margin:0; color:var(--u-ink-2); font-size:14.5px; }
.ui03-section { padding-top:60px; }

/* ---------- 徽章 ---------- */
.ui03-badge { display:inline-flex; align-items:center; gap:5px; font-family:"JetBrains Mono",ui-monospace,Menlo,monospace; font-size:10.5px; font-weight:700; padding:3px 9px; border-radius:20px; white-space:nowrap; }
.ui03-badge.agent { background:var(--u-agent-soft); color:var(--u-agent); }
.ui03-badge.tip { background:var(--u-figjam-soft); color:var(--u-figjam); }
.ui03-badge.manual { background:#eef0f1; color:var(--u-ink-2); }
.ui03-badge.you { background:var(--u-brand-soft); color:var(--u-brand-strong); }

/* ---------- 流程總覽膠囊列 ---------- */
.stage-pills { display:flex; flex-wrap:wrap; gap:8px; margin-top:22px; }
.stage-pills a { display:flex; align-items:center; gap:8px; font-size:12.5px; font-weight:700; padding:8px 14px; border-radius:999px; background:var(--u-paper); border:1.5px solid var(--u-line); color:var(--u-ink-2); }
.stage-pills a b { font-family:"JetBrains Mono",ui-monospace,Menlo,monospace; color:var(--u-brand-strong); font-weight:900; }
.stage-pills a:hover { border-color:var(--u-brand); color:var(--u-ink); }

/* ---------- 通用示意圖小標籤 ---------- */
.si-diagram-label { font-family:"JetBrains Mono",ui-monospace,Menlo,monospace; font-size:10.5px; color:var(--u-ink-3); text-transform:uppercase; letter-spacing:.06em; margin:0 0 10px; display:flex; align-items:center; gap:8px; }
.si-diagram-label::before { content:"▦"; color:var(--u-agent); }

/* ---------- 每一個功能單元（stage） ---------- */
.stage { padding:56px 0; border-bottom:1px solid var(--u-line); background-color:transparent; }
.stage:last-child { border-bottom:none; }
.stage-num { font-family:"JetBrains Mono",ui-monospace,Menlo,monospace; font-size:13px; font-weight:900; color:var(--u-brand-strong); background:var(--u-brand-soft); display:inline-flex; padding:4px 11px; border-radius:20px; }
.fig-head { margin-bottom:28px; }
.fig-head h3 { margin:12px 0 0; font-size:clamp(22px,2.6vw,30px); font-weight:900; color:var(--u-ink); line-height:1.3; }
.fig-head .fig-def { margin-top:12px; font-size:16px; line-height:1.85; color:var(--u-ink-2); max-width:56em; }
.fig-head .fig-tag { margin-top:14px; }
.fig-tip { margin-top:16px; font-size:13.5px; line-height:1.8; background:var(--u-figjam-soft); border-left:3px solid var(--u-figjam); border-radius:0 8px 8px 0; padding:11px 14px; color:var(--u-ink-2); max-width:56em; }
.fig-tip > b:first-child { display:block; font-family:"JetBrains Mono",ui-monospace,Menlo,monospace; font-size:10px; text-transform:uppercase; letter-spacing:.05em; color:var(--u-figjam); margin-bottom:5px; }
.fig-tip b { color:var(--u-ink); font-weight:700; }
.fig-tip code, .fig-note code, .fig-def code { font-family:"JetBrains Mono",ui-monospace,Menlo,monospace; font-size:.92em; background:rgba(10,20,20,.06); border-radius:4px; padding:1px 5px; color:var(--u-brand-strong); }
.fig-tip ol { counter-reset:tipstep; }
.fig-tip ol li { list-style:none; position:relative; padding-left:26px; }
.fig-tip ol li::before { counter-increment:tipstep; content:counter(tipstep); position:absolute; left:0; top:0; width:19px; height:19px; border-radius:50%; background:var(--u-figjam); color:#fff; font:800 11px/19px "JetBrains Mono",ui-monospace,Menlo,monospace; text-align:center; }
.fig-note { font-size:14px; line-height:1.8; background:var(--u-brand-soft); border-radius:10px; padding:13px 16px; margin-top:16px; color:var(--u-ink-2); max-width:56em; }
.fig-note > b:first-child { color:var(--u-brand-strong); font-family:"JetBrains Mono",ui-monospace,Menlo,monospace; font-size:10px; text-transform:uppercase; letter-spacing:.05em; display:block; margin-bottom:5px; }
.fig-note b { color:var(--u-ink); font-weight:700; }

/* ---------- 步驟卡（Grid：由左至右、由上至下的閱讀順序） ---------- */
.fig-steps { display: grid; grid-template-columns: repeat(2, minmax(0,1fr)); gap: 22px; margin-top: 8px; align-items: start; }
.fig-step { min-width: 0; background: var(--u-paper); border: 1.5px solid var(--u-line); border-radius: 16px; overflow: hidden; box-shadow: 0 1px 0 var(--u-line), 0 20px 40px -32px rgba(10,20,20,.35); display: flex; flex-direction: column; }
.fig-step-body { padding: 16px 18px 14px; display: flex; gap: 12px; align-items: flex-start; }
.fig-step-no { flex: none; width: 28px; height: 28px; border-radius: 50%; background: var(--u-ink); color: #fff; font: 900 12.5px/28px "JetBrains Mono",ui-monospace,Menlo,monospace; text-align: center; }
.fig-step-text { font-size: 14px; line-height: 1.7; color: var(--u-ink); }
.fig-step-text b.fig-step-head { display: block; font-size: 14.5px; margin-bottom: 3px; }
.fig-step-text b { font-weight: 700; }
.fig-step-media { border-top: 1px solid var(--u-line); background: var(--u-bg); margin-top: auto; }
.fig-step-media img { width: 100%; height: auto; max-height: 360px; object-fit: contain; display: block; margin: 0 auto; background: var(--u-bg); }
.fig-step-media > a { display: block; line-height: 0; position: relative; cursor: zoom-in; }
.fig-step-media > a::after { content: "\f52d"; font-family: "bootstrap-icons"; position: absolute; right: 10px; bottom: 10px; width: 30px; height: 30px; line-height: 30px; text-align: center; border-radius: 50%; background: rgba(27,31,34,.72); color: #fff; font-size: 14px; opacity: 0; transform: scale(.85); transition: opacity .18s, transform .18s; }
.fig-step-media > a:hover::after { opacity: 1; transform: scale(1); }
.fig-step-media > a:hover img { filter: brightness(.96); }
.fig-step-media figcaption { padding: 9px 16px; font-size: 11.5px; }
.fig-step-media figcaption a { color: var(--u-ink-3); }
.fig-step-media figcaption a:hover { color: var(--u-brand-strong); }
.fig-step.wide { grid-column: 1 / -1; }
.fig-step.wide .fig-step-media img { max-height: 460px; }
@media (max-width: 700px) { .fig-steps { grid-template-columns: 1fr; gap: 18px; } }

/* ---------- 影片縮圖（點擊以 GLightbox 跳窗播放） ---------- */
.fig-video-thumb { position: relative; }
.fig-video-thumb img { max-height: 460px; }
.fig-video-play { position: absolute; inset: 0; display: flex; align-items: center; justify-content: center; }
.fig-video-play i { width: 64px; height: 64px; border-radius: 50%; background: rgba(27,31,34,.72); color: #fff; font-size: 28px; display: flex; align-items: center; justify-content: center; transition: background .18s, transform .18s; }
.fig-video-thumb:hover .fig-video-play i { background: var(--u-figjam); transform: scale(1.08); }
.fig-step-media > a.fig-video-thumb::after { content: none; }

/* 影片跳窗內容：直接內嵌 YouTube iframe（inline 模式），不依賴外部 Plyr CDN，確保跳窗一定能播放 */
.ui03-video-modal { display: none; position: fixed; inset: 0; z-index: 99999; background: rgba(10,12,14,.94); align-items: center; justify-content: center; padding: 60px 16px; }
.ui03-video-modal.is-open { display: flex; }
.ui03-video-modal .ratio-16x9 { position: relative; width: min(960px, 92vw, calc((100vh - 120px) * 16 / 9)); aspect-ratio: 16 / 9; background: #000; border-radius: 6px; overflow: hidden; box-shadow: 0 30px 80px rgba(0,0,0,.5); }
.ui03-video-modal .ratio-16x9 iframe { position: absolute; inset: 0; width: 100%; height: 100%; border: 0; display: block; }
.video-modal-close { position: absolute; top: 18px; right: 18px; z-index: 2; width: 40px; height: 40px; border-radius: 50%; border: none; background: rgba(255,255,255,.12); color: #fff; font-size: 26px; line-height: 1; cursor: pointer; display: flex; align-items: center; justify-content: center; transition: background .18s; }
.video-modal-close:hover { background: var(--u-figjam); }
body.video-modal-open { overflow: hidden; }

/* ---------- Frame 全寬參考圖 ---------- */
.fig-ref-img { margin: 8px 0 0; border-radius: 16px; overflow: hidden; border: 1.5px solid var(--u-line); box-shadow: 0 1px 0 var(--u-line), 0 26px 50px -38px rgba(10,20,20,.35); }
.fig-ref-img img { width: 100%; height: auto; display: block; }
.fig-ref-img > a { display: block; line-height: 0; position: relative; cursor: zoom-in; }
.fig-ref-img > a::after { content: "\f52d"; font-family: "bootstrap-icons"; position: absolute; right: 14px; bottom: 14px; width: 34px; height: 34px; line-height: 34px; text-align: center; border-radius: 50%; background: rgba(27,31,34,.72); color: #fff; font-size: 15px; opacity: 0; transform: scale(.85); transition: opacity .18s, transform .18s; }
.fig-ref-img > a:hover::after { opacity: 1; transform: scale(1); }
.fig-ref-cap { margin-top: 10px; font-size: 12px; color: var(--u-ink-3); }

/* ---------- 延伸補充摺疊卡 ---------- */
.fig-extra { margin-top: 18px; border: 1.5px dashed var(--u-line); border-radius: 14px; overflow: hidden; background: #fbfffe; }
.fig-extra summary { cursor: pointer; list-style: none; padding: 13px 16px; display: flex; align-items: center; justify-content: space-between; gap: 10px; font-weight: 700; font-size: 13.5px; color: var(--u-ink-2); }
.fig-extra summary::-webkit-details-marker { display: none; }
.fig-extra summary::after { content: "展開看看 ▾"; font-size: 11px; font-weight: 500; color: var(--u-brand-strong); font-family: "JetBrains Mono",ui-monospace,Menlo,monospace; flex: none; }
.fig-extra[open] summary::after { content: "收起 ▴"; }
.fig-extra .fig-extra-body { padding: 0 16px 16px; }

/* ---------- 變數（Variables）示意圖：可點擊 Light／Dark 切換 ---------- */
.var-diagram { margin: 8px 0 4px; border-radius: 14px; overflow: hidden; border: 1.5px solid var(--u-line); background: #22262b; padding: 4px 0; }
.var-diagram svg { width: 100%; height: auto; display: block; }
.var-panel-bg { fill: #22262b; }
.var-row-bg { fill: #2c3138; }
.var-row-bg.alt { fill: #262a30; }
.var-label { font: 700 12.5px/1 "JetBrains Mono",ui-monospace,Menlo,monospace; fill: #cfd6dc; }
.var-sub { font: 500 10.5px/1 "JetBrains Mono",ui-monospace,Menlo,monospace; fill: #7d858d; transition: opacity .25s; }
.var-mode-pill { fill: #3a3f47; transition: fill .25s; }
.var-mode-pill.on { fill: var(--u-brand); }
.var-mode-text { font: 700 10.5px/1 "JetBrains Mono",ui-monospace,Menlo,monospace; fill: #cfd6dc; transition: fill .25s; }
.var-mode-text.on { fill: #08211f; }
.var-mode-btn { cursor: pointer; }
.var-mode-btn:not(.m-add):hover .var-mode-pill:not(.on) { fill: #4b515a; }
.var-mode-btn.m-add { cursor: help; }
.var-mode-btn:focus-visible { outline: none; }
.var-mode-btn:focus-visible .var-mode-pill { stroke: #fff; stroke-width: 2; }
.var-swatch { stroke: #454b53; stroke-width: 1.5; transition: opacity .25s, stroke .25s, stroke-width .25s, transform .25s; transform-box: fill-box; transform-origin: center; }
/* 目前所在模式：該欄數值放大＋亮邊框；另一欄淡出，凸顯「同一個變數、兩種值」 */
.var-diagram[data-mode="light"] .var-swatch.m-dark,
.var-diagram[data-mode="light"] .var-sub.m-dark { opacity: .32; }
.var-diagram[data-mode="dark"] .var-swatch.m-light,
.var-diagram[data-mode="dark"] .var-sub.m-light { opacity: .32; }
.var-diagram[data-mode="light"] .var-swatch.m-light { stroke: var(--u-brand); stroke-width: 3; transform: scale(1.1); }
.var-diagram[data-mode="dark"] .var-swatch.m-dark { stroke: var(--u-brand); stroke-width: 3; transform: scale(1.1); }
.var-diagram-hint { margin: 0; padding: 10px 16px 12px; font-size: 12px; line-height: 1.7; color: #9aa2ab; background: #1c2024; border-top: 1px solid #33383f; }
.var-diagram-hint b { color: var(--u-brand); font-family: "JetBrains Mono",ui-monospace,Menlo,monospace; }

/* ---------- 變數 Light/Dark 互動示範 ---------- */
.var-demo { margin-top: 18px; border: 1.5px solid var(--u-line); border-radius: 16px; overflow: hidden; }
.var-demo-toggle { display: flex; }
.var-demo-toggle button { flex: 1; appearance: none; border: none; background: #eef0f1; color: var(--u-ink-2); padding: 11px; font: 700 13px/1 inherit; font-family: inherit; cursor: pointer; }
.var-demo-toggle button[aria-pressed="true"] { background: var(--u-ink); color: #fff; }
.var-demo-stage { padding: 26px; display: flex; align-items: center; justify-content: center; transition: background .25s; }
.var-demo-stage.mode-light { background: #F5F7F8; }
.var-demo-stage.mode-dark { background: #14171A; }
.var-demo-card { width: 220px; border-radius: 16px; padding: 18px; text-align: center; transition: background .25s, color .25s; }
.var-demo-stage.mode-light .var-demo-card { background: #fff; box-shadow: 0 10px 24px -14px rgba(0,0,0,.25); }
.var-demo-stage.mode-dark .var-demo-card { background: #1F2327; box-shadow: 0 10px 24px -10px rgba(0,0,0,.6); }
.var-demo-avatar { width: 44px; height: 44px; border-radius: 50%; margin: 0 auto 10px; transition: background .25s; }
.var-demo-stage.mode-light .var-demo-avatar { background: var(--u-brand-soft); }
.var-demo-stage.mode-dark .var-demo-avatar { background: #2A3F3E; }
.var-demo-card .name { font-weight: 800; font-size: 14.5px; transition: color .25s; }
.var-demo-stage.mode-light .var-demo-card .name { color: #1B1F22; }
.var-demo-stage.mode-dark .var-demo-card .name { color: #F5F7F8; }
.var-demo-card .sub { font-size: 11.5px; margin-top: 2px; transition: color .25s; }
.var-demo-stage.mode-light .var-demo-card .sub { color: #8A9199; }
.var-demo-stage.mode-dark .var-demo-card .sub { color: #8A9199; }
.var-demo-card .btn { margin-top: 14px; display: block; width: 100%; border: none; border-radius: 9px; padding: 9px; font: 700 12.5px/1 inherit; font-family: inherit; transition: background .25s, color .25s; }
.var-demo-stage.mode-light .var-demo-card .btn { background: var(--u-brand); color: #fff; }
.var-demo-stage.mode-dark .var-demo-card .btn { background: var(--u-brand); color: #08211f; }
.var-demo-note { padding: 12px 18px; font-size: 12px; color: var(--u-ink-3); background: var(--u-bg); border-top: 1px solid var(--u-line); }
.var-demo-note b { color: var(--u-brand-strong); }

/* ---------- 課後作業 ---------- */
.hw-card { background: var(--u-ink); color: #fff; border-radius: 22px; padding: clamp(24px,4vw,40px); margin-top: 8px; }
.hw-card h4 { font-size: 19px; margin: 0 0 14px; display: flex; align-items: center; gap: 8px; }
.hw-card ol { margin: 0; padding-left: 20px; display: grid; gap: 10px; }
.hw-card li { font-size: 14.5px; line-height: 1.75; color: rgba(255,255,255,.88); }
.hw-card li::marker { color: var(--u-brand); font-weight: 900; }
.hw-card a { color: var(--u-brand); font-weight: 700; text-decoration: underline; text-underline-offset: 2px; }
.hw-card a:hover { color: #fff; }

/* ---------- 下載／銜接連結卡 ---------- */
.dl-grid { display:grid; grid-template-columns:repeat(2,minmax(0,1fr)); gap:12px; margin-top:22px; }
.dl { display:grid; grid-template-columns:46px 1fr auto; gap:14px; align-items:center; padding:16px 18px; border-radius:14px; background:var(--u-paper); color:var(--u-ink) !important; box-shadow:0 1px 0 var(--u-line), 0 16px 30px -22px rgba(18,19,22,.3); transition:transform .22s; }
.dl:hover { transform:translateY(-3px); }
.dl .ic { width:44px; height:44px; border-radius:10px; background:var(--u-bg); display:grid; place-items:center; font-size:18px; color:var(--u-brand-strong); }
.dl b { font-size:14.5px; line-height:1.4; }
.dl small { display:block; font-size:12px; color:var(--u-ink-3); font-weight:400; margin-top:2px; }
.dl .go { font-size:17px; color:var(--u-ink-3); }

/* ---------- 互動細節：selection-box 標註（呼應 Figma 選取框） ---------- */
.sel { position:relative; display:inline-block; padding:0 .08em; outline:2px solid var(--u-select); outline-offset:3px; background:var(--u-select-soft); border-radius:2px; }
.sel i { position:absolute; width:8px; height:8px; background:var(--u-paper); border:2px solid var(--u-select); }
.sel i:nth-child(1) { left:-7px; top:-7px; }
.sel i:nth-child(2) { right:-7px; top:-7px; }
.sel i:nth-child(3) { left:-7px; bottom:-7px; }
.sel i:nth-child(4) { right:-7px; bottom:-7px; }
.sel .dim { position:absolute; left:50%; bottom:-28px; transform:translateX(-50%); background:var(--u-select); color:#fff; font:600 11px var(--u-font-mono); padding:2px 7px; border-radius:4px; white-space:nowrap; letter-spacing:0; }
@media (max-width:680px) { .sel .dim { display:none; } }

/* ---------- 卡片 hover-glow：滑鼠移入時亮邊框，呼應 Figma 選取物件的視覺回饋 ---------- */
.fig-step, .ui03-note, .case-chip, .dl, .fig-extra, .stage-pills a {
	transition: outline-color .2s, border-color .2s, box-shadow .2s, transform .2s;
	outline: 1.5px solid transparent;
	outline-offset: -1.5px;
}
.fig-step:hover { outline-color: var(--u-select); box-shadow: 0 1px 0 var(--u-line), 0 26px 48px -28px rgba(10,186,181,.4); }
.ui03-note:hover { outline-color: var(--u-select); }
.ui03-note.agent:hover { outline-color: var(--u-agent); }
.case-chip:hover { box-shadow: 0 18px 36px -18px rgba(10,186,181,.55); transform: translateY(-2px); }
.fig-extra:hover { outline-color: var(--u-brand); }
.dl:hover { outline-color: var(--u-select); }

/* ---------- 截圖 hover：放大鏡提示更明確，並帶一點縮放回饋 ---------- */
.fig-step-media > a img, .fig-ref-img > a img { transition: transform .35s cubic-bezier(.2,.8,.2,1), filter .2s; }
.fig-step-media > a:hover img, .fig-ref-img > a:hover img { transform: scale(1.015); }
.fig-ref-img { transition: outline-color .2s; outline: 1.5px solid transparent; outline-offset: -1.5px; }
.fig-ref-img:hover { outline-color: var(--u-select); }

/* ---------- Frame 標籤：頁內小節前綴一個 eyebrow 式的迷你標記 ---------- */
.ui03-eyebrow { display:inline-flex; align-items:center; gap:6px; font-family: var(--u-font-mono); font-size:11px; font-weight:600; letter-spacing:.1em; text-transform:uppercase; color: var(--u-select); }
.ui03-eyebrow::before { content:""; width:6px; height:6px; border-radius:1px; background: var(--u-select); }

/* ---------- 響應式 ---------- */
@media (max-width:991px) {
	.ui03-intro { grid-template-columns:1fr; gap:26px; padding-top:36px; }
	.dl-grid { grid-template-columns:1fr; }
}
@media (max-width:680px) {
	.ui03-wrap { padding:0 16px; }
	.ui03-stats { grid-template-columns:repeat(2,1fr); row-gap:16px; }
	.ui03-stats .stat-number { font-size:26px; }
	.ui03-subnav a { padding:12px 11px 10px; font-size:12.5px; }
	.var-demo-toggle button { padding:10px 6px; font-size:12px; }
}
@media (prefers-reduced-motion: reduce) {
	.ui03-marquee-track { animation:none; }
}