/* 學長姐講堂樣式（由初稿 mockup 移植；色彩 tokens 在 :root，data-theme="light" 為預設） */
/* ---------- 色彩 tokens：深色（同參考網站）／淺色（白底高對比） ---------- */
:root{
  --bg:#0f1012; --surface:#17181b; --surface-2:#1e2024; --surface-3:#26292e;
  --border:#2d3036; --text:#f2f2ef; --muted:#a2a5ac; --faint:#8b9099;
  --accent:#d6bb85; --accent-ink:#1b150a; --accent-soft:rgba(214,187,133,.14);
  --ok:#55c08f; --ok-soft:rgba(85,192,143,.14); --warn:#e2a64a; --warn-soft:rgba(226,166,74,.15);
  --danger:#e66a62; --danger-soft:rgba(230,106,98,.14); --info:#7aa7e8; --info-soft:rgba(122,167,232,.14);
  --player:#000; --shadow:0 10px 30px rgba(0,0,0,.35);
  --radius:12px; --radius-sm:8px;
  --font:"Noto Sans TC","PingFang TC","Microsoft JhengHei",system-ui,sans-serif;
  --mockbar-h:0px;
}
:root[data-theme="light"]{
  --bg:#ffffff; --surface:#ffffff; --surface-2:#f4f5f7; --surface-3:#eceef2;
  --border:#dfe2e7; --text:#121417; --muted:#525866; --faint:#666c7a;
  --accent:#1f3c6e; --accent-ink:#ffffff; --accent-soft:rgba(31,60,110,.09);
  --ok:#17804f; --ok-soft:rgba(23,128,79,.1); --warn:#a05f00; --warn-soft:rgba(160,95,0,.1);
  --danger:#c0392b; --danger-soft:rgba(192,57,43,.09); --info:#1d5fbf; --info-soft:rgba(29,95,191,.09);
  --player:#0b0b0c; --shadow:0 8px 24px rgba(16,24,40,.08);
}
/* 後台固定白底高對比 */
.admin-scope{
  --bg:#f5f6f8; --surface:#ffffff; --surface-2:#f4f5f7; --surface-3:#eceef2;
  --border:#dfe2e7; --text:#121417; --muted:#525866; --faint:#666c7a;
  --accent:#1f3c6e; --accent-ink:#ffffff; --accent-soft:rgba(31,60,110,.09);
  --ok:#17804f; --ok-soft:rgba(23,128,79,.1); --warn:#a05f00; --warn-soft:rgba(160,95,0,.1);
  --danger:#c0392b; --danger-soft:rgba(192,57,43,.09); --info:#1d5fbf; --info-soft:rgba(29,95,191,.09);
  --shadow:0 8px 24px rgba(16,24,40,.08);
  background:var(--bg); color:var(--text);
}
*{box-sizing:border-box}
html,body{margin:0}
html{scroll-padding-top:calc(var(--mockbar-h) + 12px)}
body{background:var(--bg);color:var(--text);font-family:var(--font);font-size:15px;line-height:1.65;padding-top:var(--mockbar-h);-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}
button,input,select,textarea{font:inherit;color:inherit}
img{display:block}
h1,h2,h3,h4{margin:0;line-height:1.35}
p{margin:0}
.ico{display:inline-block;vertical-align:-.22em;width:18px;height:18px;flex:none;stroke:currentColor;fill:none;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}
.ico.sm{width:15px;height:15px}
.ico.lg{width:28px;height:28px}
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0)}

/* ---------- 共用元件 ---------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;border-radius:var(--radius-sm);border:1px solid var(--border);background:var(--surface-2);padding:8px 14px;cursor:pointer;font-weight:500;white-space:nowrap;transition:filter .15s,background .15s}
.btn:hover{filter:brightness(1.08)}
.btn.primary{background:var(--accent);color:var(--accent-ink);border-color:var(--accent);font-weight:700}
.btn.ghost{background:transparent}
.btn.danger{color:var(--danger);border-color:var(--danger-soft);background:var(--danger-soft)}
.btn.sm{padding:5px 10px;font-size:13px}
.btn.full{width:100%}
.btn:disabled{opacity:.5;cursor:not-allowed}
.pill{display:inline-flex;align-items:center;gap:4px;font-size:12px;padding:1px 8px;border-radius:999px;background:var(--surface-3);color:var(--muted);white-space:nowrap;font-weight:500}
.pill.accent{background:var(--accent-soft);color:var(--accent)}
.pill.ok{background:var(--ok-soft);color:var(--ok)}
.pill.warn{background:var(--warn-soft);color:var(--warn)}
.pill.danger{background:var(--danger-soft);color:var(--danger)}
.pill.info{background:var(--info-soft);color:var(--info)}
.pill.sample{background:transparent;border:1px dashed var(--faint);color:var(--faint)}
.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius)}
.muted{color:var(--muted)}
.faint{color:var(--faint)}
.row{display:flex;align-items:center;gap:10px}
.wrap{flex-wrap:wrap}
.grow{flex:1;min-width:0}
.container{max-width:1160px;margin:0 auto;padding:0 20px}
.field{display:flex;flex-direction:column;gap:6px;margin-bottom:14px}
.field label{font-size:13px;font-weight:500;color:var(--muted)}
.input,select.input,textarea.input{width:100%;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-sm);padding:9px 12px;outline:none}
.input:focus{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-soft)}
textarea.input{min-height:110px;resize:vertical}
.hint{font-size:12.5px;color:var(--faint)}
.seg{display:inline-flex;background:var(--surface-2);border:1px solid var(--border);border-radius:var(--radius-sm);padding:3px;gap:3px;flex-wrap:wrap}
.seg button{border:0;background:transparent;padding:6px 12px;border-radius:6px;cursor:pointer;color:var(--muted);font-weight:500}
.seg button.on{background:var(--surface);color:var(--text);box-shadow:0 1px 3px rgba(0,0,0,.15)}
.toggle{position:relative;width:40px;height:22px;flex:none;border-radius:999px;background:var(--surface-3);border:1px solid var(--border);cursor:pointer}
.toggle::after{content:"";position:absolute;top:2px;left:2px;width:16px;height:16px;border-radius:50%;background:var(--faint);transition:left .15s,background .15s}
.toggle.on{background:var(--accent-soft);border-color:var(--accent)}
.toggle.on::after{left:20px;background:var(--accent)}
.progress{height:6px;border-radius:999px;background:var(--surface-3);overflow:hidden}
.progress>i{display:block;height:100%;background:var(--accent);border-radius:999px;transition:width .3s}
.empty{padding:28px;text-align:center;color:var(--faint)}
.toast{position:fixed;left:50%;bottom:24px;transform:translateX(-50%);background:#16181b;color:#fff;padding:10px 16px;border-radius:10px;box-shadow:var(--shadow);z-index:200;font-size:14px;max-width:calc(100% - 32px)}
.note{border:1px dashed var(--faint);border-radius:var(--radius-sm);padding:10px 12px;font-size:13px;color:var(--muted);background:var(--surface-2)}

/* ---------- 前台：頁首 ---------- */
.site-header{position:sticky;top:var(--mockbar-h);z-index:30;background:color-mix(in srgb,var(--bg) 88%,transparent);backdrop-filter:blur(10px);border-bottom:1px solid var(--border)}
.site-header .container{display:flex;align-items:center;gap:18px;height:62px}
.brand{display:flex;align-items:center;gap:10px;font-weight:700;letter-spacing:.02em}
.brand-mark{width:36px;height:36px;border-radius:9px;display:grid;place-items:center;background:var(--accent);color:var(--accent-ink)}
.brand small{display:block;font-size:11px;font-weight:500;color:var(--muted);letter-spacing:.06em;line-height:1.2}
.brand b{display:block;line-height:1.25}
.site-nav{display:flex;align-items:center;gap:4px;margin-left:auto}
.site-nav a{padding:6px 10px;border-radius:8px;color:var(--muted);font-weight:500}
.site-nav a:hover,.site-nav a.on{color:var(--text);background:var(--surface-2)}
.site-nav a.avatar{padding:0}
.site-nav a.avatar.on{box-shadow:0 0 0 2px var(--accent)}
a.speaker-card{transition:border-color .15s}
a.speaker-card:hover{border-color:var(--accent)}
.avatar{width:30px;height:30px;border-radius:50%;display:grid;place-items:center;font-size:13px;font-weight:700;background:var(--accent-soft);color:var(--accent);flex:none}

/* 首頁 */
.hero{position:relative;overflow:hidden;border-bottom:1px solid var(--border)}
.hero-bg{position:absolute;inset:0;background:
  radial-gradient(900px 380px at 78% 10%,var(--accent-soft),transparent 60%),
  radial-gradient(700px 300px at 0% 100%,var(--info-soft),transparent 60%)}
.hero .container{position:relative;padding-top:64px;padding-bottom:56px;display:grid;grid-template-columns:1.2fr .8fr;gap:40px;align-items:center}
.hero h1{font-size:clamp(28px,4.4vw,46px);letter-spacing:.01em}
.hero h1 em{font-style:normal;color:var(--accent)}
.hero p.lead{margin-top:14px;font-size:17px;color:var(--muted);max-width:560px}
.hero .cta{margin-top:24px;display:flex;gap:10px;flex-wrap:wrap}
.hero-stats{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.hero-stats .card{padding:16px}
.hero-stats b{font-size:26px;display:block}
.section-title{display:flex;align-items:flex-end;justify-content:space-between;gap:12px;margin:40px 0 16px}
.section-title h2{font-size:22px}
.chips{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:18px}
.chip{border:1px solid var(--border);background:var(--surface);border-radius:999px;padding:5px 14px;cursor:pointer;color:var(--muted);font-weight:500}
.chip.on{background:var(--accent);border-color:var(--accent);color:var(--accent-ink)}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:18px}
.course-card{overflow:hidden;display:flex;flex-direction:column;transition:transform .15s,box-shadow .15s}
.course-card:hover{transform:translateY(-2px);box-shadow:var(--shadow)}
.cover{position:relative;aspect-ratio:16/9;overflow:hidden;display:flex;align-items:flex-end;padding:14px;color:#fff}
.cover::before{content:"";position:absolute;inset:0;background:linear-gradient(135deg,hsl(var(--h) 45% 26%),hsl(calc(var(--h) + 40) 50% 14%))}
.cover::after{content:"";position:absolute;inset:0;background:
  repeating-linear-gradient(90deg,rgba(255,255,255,.05) 0 1px,transparent 1px 34px),
  repeating-linear-gradient(0deg,rgba(255,255,255,.05) 0 1px,transparent 1px 34px);mask-image:linear-gradient(to left,#000,transparent 75%)}
.cover .glyph{position:absolute;right:-14px;top:-14px;opacity:.18;z-index:1}
.cover .glyph svg{width:150px;height:150px;stroke:#fff;fill:none;stroke-width:1}
.cover .cv-text{position:relative;z-index:2;font-weight:700;font-size:17px;line-height:1.35;text-shadow:0 1px 8px rgba(0,0,0,.4)}
.cover .cv-cat{position:absolute;z-index:2;left:14px;top:12px;font-size:12px;background:rgba(0,0,0,.35);padding:2px 8px;border-radius:999px;backdrop-filter:blur(4px)}
.course-card .body{padding:14px 16px 16px;display:flex;flex-direction:column;gap:8px;flex:1}
.course-card h3{font-size:16px}
.course-card .meta{font-size:13px;color:var(--muted)}
.speaker-line{display:flex;align-items:center;gap:8px;font-size:13px;color:var(--muted)}

/* 課程介紹頁 */
.course-hero{border-bottom:1px solid var(--border);background:var(--surface)}
.course-layout{display:grid;grid-template-columns:minmax(0,1fr) 340px;gap:32px;align-items:start;padding-top:28px;padding-bottom:60px}
.course-layout h1{font-size:clamp(24px,3.4vw,34px)}
.tabs{display:flex;gap:4px;border-bottom:1px solid var(--border);overflow-x:auto;position:sticky;top:calc(var(--mockbar-h) + 62px);background:var(--bg);z-index:5;margin-top:22px}
.tabs a,.tabs button{padding:12px 14px;color:var(--muted);font-weight:500;border:0;background:none;border-bottom:2px solid transparent;cursor:pointer;white-space:nowrap}
.tabs a.on,.tabs button.on{color:var(--text);border-bottom-color:var(--accent)}
.block{padding:26px 0;border-bottom:1px solid var(--border);scroll-margin-top:calc(var(--mockbar-h) + 62px + 50px)}
.mobile-cta{display:none}
#unit-desc,#qa{scroll-margin-top:12px}
.block h2{font-size:19px;margin-bottom:12px}
.points{display:grid;gap:10px;margin:0;padding:0;list-style:none}
.points li{display:flex;gap:10px;align-items:flex-start}
.points li .ico{color:var(--accent);margin-top:4px}
.curr-sec{border:1px solid var(--border);border-radius:var(--radius);margin-bottom:10px;overflow:hidden;background:var(--surface)}
.curr-sec>summary{list-style:none;cursor:pointer;padding:13px 16px;display:flex;align-items:center;gap:10px;font-weight:700}
.curr-sec>summary::-webkit-details-marker{display:none}
.curr-sec>summary .chev{transition:transform .2s;color:var(--muted)}
.curr-sec[open]>summary .chev{transform:rotate(90deg)}
.curr-unit{display:flex;align-items:center;gap:10px;padding:10px 16px;border-top:1px solid var(--border);font-size:14px}
.curr-unit .t{flex:1;min-width:0}
.curr-unit .d{color:var(--faint);font-variant-numeric:tabular-nums;font-size:13px}
.side-card{position:sticky;top:calc(var(--mockbar-h) + 80px);overflow:hidden}
.side-card .inner{padding:18px;display:flex;flex-direction:column;gap:14px}
.facts{display:grid;gap:8px;font-size:14px;color:var(--muted)}
.facts div{display:flex;gap:8px;align-items:center}
.faq details{border-bottom:1px solid var(--border);padding:12px 0}
.faq summary{cursor:pointer;font-weight:500}
.faq p{margin-top:8px;color:var(--muted)}
.speaker-card{display:flex;gap:16px;align-items:flex-start;padding:16px}
.speaker-photo{width:64px;height:64px;border-radius:50%;flex:none;display:grid;place-items:center;font-weight:700;font-size:22px;color:#fff;background:linear-gradient(135deg,hsl(var(--h) 40% 40%),hsl(calc(var(--h) + 50) 45% 25%))}

/* 上課頁（播放器版面，對照參考網站） */
.learn{display:grid;grid-template-columns:320px minmax(0,1fr);grid-template-rows:56px minmax(0,1fr);height:calc(100vh - var(--mockbar-h));background:var(--bg)}
.learn.collapsed{grid-template-columns:0 minmax(0,1fr)}
.learn-top{grid-column:1/-1;display:flex;align-items:center;gap:10px;padding:0 14px;border-bottom:1px solid var(--border);background:var(--surface)}
.learn-side{border-right:1px solid var(--border);background:var(--surface);display:flex;flex-direction:column;min-height:0;overflow:hidden}
.learn-side .head{padding:14px 16px;border-bottom:1px solid var(--border);display:flex;gap:8px;align-items:flex-start}
.learn-side .head b{flex:1;font-size:14.5px;line-height:1.45}
.learn-side .list{flex:1;overflow-y:auto;padding:6px 0 12px}
.ls-sec{margin-top:6px}
.ls-sec>button{width:100%;display:flex;align-items:center;gap:8px;padding:10px 16px;background:none;border:0;cursor:pointer;text-align:left;font-weight:700;font-size:13.5px;color:var(--text)}
.ls-sec>button .chev{margin-left:auto;transition:transform .2s;color:var(--muted)}
.ls-sec.open>button .chev{transform:rotate(90deg)}
.ls-sec .units{display:none;padding:0 8px}
.ls-sec.open .units{display:block}
.ls-unit{display:flex;gap:10px;align-items:flex-start;padding:9px 10px;border-radius:9px;color:var(--muted);font-size:13.5px;line-height:1.45}
.ls-unit:hover{background:var(--surface-2);color:var(--text)}
.ls-unit.on{background:var(--accent);color:var(--accent-ink)}
.ls-unit.on .d{color:inherit;opacity:.75}
.ls-unit .st{margin-top:2px;flex:none}
.ls-unit .st.done{color:var(--ok)}
.ls-unit.on .st.done{color:inherit}
.ls-unit .d{display:block;font-size:12px;color:var(--faint);font-variant-numeric:tabular-nums}
.learn-side .foot{border-top:1px solid var(--border);padding:12px 16px;font-size:13.5px}
.learn-main{overflow-y:auto;min-height:0}
.learn-main .inner{max-width:980px;margin:0 auto;padding:22px 24px 60px}
.learn-main h1{font-size:clamp(18px,2.4vw,24px);margin-bottom:16px}
.player{position:relative;aspect-ratio:16/9;background:var(--player);border-radius:10px;overflow:hidden;display:grid;place-items:center;color:#fff}
.player .poster{position:absolute;inset:0;background:linear-gradient(135deg,hsl(var(--h) 35% 22%),#050505 70%);opacity:.9}
.player .play{position:relative;width:72px;height:72px;border-radius:50%;background:rgba(255,255,255,.14);border:1px solid rgba(255,255,255,.35);display:grid;place-items:center;cursor:pointer;backdrop-filter:blur(6px)}
.player .play svg{width:30px;height:30px;fill:#fff;stroke:none;margin-left:4px}
.player .bar{position:absolute;left:0;right:0;bottom:0;padding:10px 14px;display:flex;align-items:center;gap:10px;font-size:12.5px;background:linear-gradient(transparent,rgba(0,0,0,.7))}
.player .bar .progress{flex:1;background:rgba(255,255,255,.2)}
.player .wm{position:absolute;right:14px;top:12px;font-size:11.5px;opacity:.5}
.player .cap{position:absolute;left:14px;top:12px;font-size:12px;background:rgba(0,0,0,.45);padding:3px 9px;border-radius:6px}
.locked{aspect-ratio:16/9;background:var(--player);border-radius:10px;display:grid;place-items:center;text-align:center;color:#ddd;padding:20px}
.locked .ico{width:44px;height:44px;margin:0 auto 12px;stroke:#fff}
.locked a{color:#e9cf9a;text-decoration:underline}
.resume{display:flex;align-items:center;gap:10px;margin-top:12px;padding:10px 14px;border-radius:10px;background:var(--accent-soft);color:var(--text);font-size:14px}
.article{font-size:15.5px;line-height:1.85}
.article h3{margin:18px 0 8px;font-size:17px}
.article p{margin:0 0 12px}
.article ol,.article ul{margin:0 0 12px;padding-left:22px}
.file-row{display:flex;align-items:center;gap:12px;padding:12px 14px;border:1px solid var(--border);border-radius:10px;background:var(--surface);margin-bottom:8px}
.comment{display:flex;gap:12px;padding:14px 0;border-bottom:1px solid var(--border)}
.comment .reply{margin-top:10px;padding:10px 12px;border-radius:9px;background:var(--surface-2);font-size:14px}
.unit-nav{display:flex;justify-content:space-between;gap:10px;margin-top:28px;padding-top:18px;border-top:1px solid var(--border)}
.scrim{display:none}

/* 登入 */
.auth{min-height:calc(100vh - var(--mockbar-h) - 62px);display:grid;place-items:center;padding:30px 16px}
.auth .card{width:100%;max-width:440px;padding:26px}

/* ---------- 後台 ---------- */
.admin{display:grid;grid-template-columns:232px minmax(0,1fr);min-height:calc(100vh - var(--mockbar-h))}
.admin-side{background:#13233f;color:#d9e1ef;padding:16px 12px;display:flex;flex-direction:column;gap:4px;position:sticky;top:var(--mockbar-h);height:calc(100vh - var(--mockbar-h))}
.admin-side .brand{color:#fff;padding:4px 8px 16px}
.admin-side .brand small{color:#9fb0cc}
.admin-side .brand-mark{background:#d6bb85;color:#1b150a}
.admin-side a{display:flex;align-items:center;gap:10px;padding:9px 12px;border-radius:8px;color:#c4cfe2;font-weight:500}
.admin-side a:hover{background:rgba(255,255,255,.06);color:#fff}
.admin-side a.on{background:rgba(214,187,133,.16);color:#f3dfb6}
.admin-side a .badge{margin-left:auto;background:#d6bb85;color:#1b150a;border-radius:999px;font-size:11.5px;padding:0 7px;font-weight:700}
.admin-side .bottom{margin-top:auto;border-top:1px solid rgba(255,255,255,.1);padding-top:10px}
.admin-main{min-width:0}
.admin-top{display:flex;align-items:center;gap:12px;padding:14px 26px;border-bottom:1px solid var(--border);background:var(--surface);position:sticky;top:var(--mockbar-h);z-index:10}
.admin-top h1{font-size:19px}
.admin-body{padding:24px 26px 60px;max-width:1240px}
.kpis{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:14px}
.kpi{padding:16px 18px}
.kpi .label{font-size:13px;color:var(--muted)}
.kpi b{font-size:28px;display:block;margin-top:4px;font-variant-numeric:tabular-nums}
.kpi .sub{font-size:12.5px;color:var(--faint)}
.two{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:16px;margin-top:16px}
.panel{padding:18px}
.panel>h3{font-size:15.5px;margin-bottom:12px;display:flex;align-items:center;gap:8px}
.table-wrap{overflow-x:auto;border:1px solid var(--border);border-radius:var(--radius);background:var(--surface)}
table{width:100%;border-collapse:collapse;font-size:14px}
th,td{text-align:left;padding:11px 14px;border-bottom:1px solid var(--border);vertical-align:middle;white-space:nowrap}
th{font-size:12.5px;color:var(--muted);font-weight:500;background:var(--surface-2)}
tr:last-child td{border-bottom:0}
td.wrapcell{white-space:normal;min-width:220px}
.thumb{width:72px;aspect-ratio:16/9;border-radius:6px;flex:none;background:linear-gradient(135deg,hsl(var(--h) 45% 32%),hsl(calc(var(--h) + 40) 50% 16%))}
.toolbar{display:flex;gap:10px;align-items:center;flex-wrap:wrap;margin-bottom:14px}
.editor-sec{border:1px solid var(--border);border-radius:var(--radius);background:var(--surface);margin-bottom:14px;overflow:hidden}
.editor-sec .sh{display:flex;align-items:center;gap:10px;padding:10px 12px;background:var(--surface-2);border-bottom:1px solid var(--border)}
.editor-sec .sh input{flex:1;font-weight:700;background:transparent;border:1px solid transparent;border-radius:6px;padding:5px 8px}
.editor-sec .sh input:hover,.editor-sec .sh input:focus{border-color:var(--border);background:var(--surface);outline:none}
.eu{display:flex;align-items:center;gap:10px;padding:9px 12px;border-bottom:1px solid var(--border);font-size:14px}
.eu:last-child{border-bottom:0}
.eu .grip{color:var(--faint);cursor:grab}
.eu .t{flex:1;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.icon-btn{width:30px;height:30px;display:grid;place-items:center;border-radius:7px;border:1px solid transparent;background:transparent;cursor:pointer;color:var(--muted);flex:none}
.icon-btn:hover{background:var(--surface-2);border-color:var(--border);color:var(--text)}
.add-row{display:flex;gap:8px;flex-wrap:wrap;padding:10px 12px;background:var(--surface)}
.dropzone{border:2px dashed var(--border);border-radius:var(--radius);padding:26px;text-align:center;background:var(--surface-2);cursor:pointer;display:block}
.dropzone>.ico{display:block;margin:0 auto}
.dropzone:focus-within{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-soft)}
.dropzone:hover{border-color:var(--accent)}
.form-grid{display:grid;grid-template-columns:minmax(0,1fr) 320px;gap:18px;align-items:start}
.setting-row{display:flex;align-items:center;gap:12px;padding:12px 0;border-bottom:1px solid var(--border)}
.setting-row:last-child{border-bottom:0}
.bars{display:grid;gap:10px}
.barrow{display:grid;grid-template-columns:minmax(0,220px) minmax(0,1fr) 54px;gap:10px;align-items:center;font-size:13.5px}
.barrow .track{height:12px;background:var(--surface-3);border-radius:999px;overflow:hidden}
.barrow .track i{display:block;height:100%;background:var(--accent);border-radius:999px}
.barrow .lbl{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.barrow .num{text-align:right;font-variant-numeric:tabular-nums;color:var(--muted)}
.modal-back{position:fixed;inset:0;background:rgba(10,12,16,.55);z-index:150;display:grid;place-items:center;padding:16px}
.modal{width:100%;max-width:560px;max-height:calc(100vh - 32px);overflow:auto;padding:22px}
.tpl{display:grid;gap:10px}
.tpl label{display:flex;gap:12px;align-items:flex-start;padding:12px 14px;border:1px solid var(--border);border-radius:10px;cursor:pointer}
.tpl label:has(input:checked){border-color:var(--accent);background:var(--accent-soft)}

/* ---------- 提案說明 ---------- */
.doc{max-width:980px;margin:0 auto;padding:34px 20px 80px}
.doc h1{font-size:clamp(24px,3.6vw,34px)}
.doc h2{font-size:21px;margin:40px 0 12px;padding-top:8px}
.doc h3{font-size:16.5px;margin:22px 0 8px}
.doc p,.doc li{color:var(--text)}
.doc p{margin:0 0 12px}
.doc ul,.doc ol{margin:0 0 12px;padding-left:22px}
.doc .lead{font-size:16.5px;color:var(--muted)}
.doc table{font-size:14px}
.doc td,.doc th{white-space:normal;vertical-align:top}
.doc .table-wrap{margin:10px 0 16px}
.callout{border-left:4px solid var(--accent);background:var(--accent-soft);padding:14px 16px;border-radius:0 10px 10px 0;margin:14px 0}
.callout b{color:var(--text)}
.arch{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:10px;align-items:stretch;margin:14px 0}
.arch .node{border:1px solid var(--border);background:var(--surface);border-radius:10px;padding:12px;font-size:13.5px}
.arch .node b{display:block;font-size:14.5px;margin-bottom:4px}
.arch .node.hl{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-soft)}
.arrow-row{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:10px;text-align:center;color:var(--faint);font-size:12px}
.toc{display:flex;gap:8px;flex-wrap:wrap;margin:18px 0 6px}
.toc a{border:1px solid var(--border);border-radius:999px;padding:4px 12px;font-size:13.5px;color:var(--muted)}
.toc a:hover{color:var(--text);border-color:var(--accent)}
.decision{display:grid;gap:12px}
.decision .card{padding:14px 16px}
.decision .q{font-weight:700;margin-bottom:6px}
.src{font-size:12.5px;color:var(--faint);word-break:break-all}
.src a{color:var(--info);text-decoration:underline}

/* ---------- 手機 ---------- */
@media (max-width:900px){
  .hero .container{grid-template-columns:1fr;padding-top:40px;padding-bottom:36px;gap:24px}
  .course-layout{grid-template-columns:minmax(0,1fr)}
  .side-card{position:static}
  .side-card .cta-box{display:none}
  .mobile-cta{display:grid;gap:10px;margin-top:16px}
  .learn{grid-template-columns:1fr}
  .learn.collapsed{grid-template-columns:1fr}
  .learn-side{position:fixed;z-index:60;top:calc(var(--mockbar-h) + 56px);bottom:0;left:0;width:min(86vw,340px);transform:translateX(-100%);transition:transform .2s;box-shadow:var(--shadow)}
  .learn.drawer .learn-side{transform:none}
  .learn.drawer .scrim{display:block;position:fixed;inset:calc(var(--mockbar-h) + 56px) 0 0 0;background:rgba(0,0,0,.45);z-index:55}
  .learn-main .inner{padding:16px 16px 50px}
  .admin{grid-template-columns:1fr;grid-template-rows:auto 1fr}
  .admin-side{position:sticky;top:var(--mockbar-h);height:auto;flex-direction:row;overflow-x:auto;padding:8px;z-index:20;gap:2px}
  .admin-side .brand,.admin-side .bottom{display:none}
  .admin-side a{white-space:nowrap;padding:7px 10px;font-size:14px}
  .admin-top{top:calc(var(--mockbar-h) + 52px);padding:12px 16px;flex-wrap:wrap}
  .admin-body{padding:16px 16px 50px}
  .kpis{grid-template-columns:1fr 1fr}
  .two,.form-grid{grid-template-columns:1fr}
  .arch,.arrow-row{grid-template-columns:1fr 1fr}
}
@media (max-width:640px){
  .container{padding:0 16px}
  .site-header .container{height:auto;padding-top:10px;padding-bottom:10px;flex-wrap:wrap;gap:8px}
  .site-nav{margin-left:0;width:100%;overflow-x:auto}
  .site-nav a{white-space:nowrap}
  .site-header{position:relative;top:auto}
  .tabs{top:var(--mockbar-h)}
  .block{scroll-margin-top:calc(var(--mockbar-h) + 50px)}
  .setting-row{flex-wrap:wrap}
  .setting-row>.grow{flex-basis:100%}
  .setting-row>.input{max-width:none!important;width:100%}
  .barrow{grid-template-columns:minmax(0,1fr) 70px 44px}
  .hero-stats{grid-template-columns:1fr 1fr}
  .learn-top .course-name{display:none}
}

/* ---------- 正式版補充 ---------- */
.cover-img img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}
.cover-img::before,.cover-img::after{display:none}
#toasts{position:fixed;left:50%;bottom:24px;transform:translateX(-50%);display:grid;gap:8px;z-index:200;width:max-content;max-width:calc(100% - 32px)}
#toasts .toast{position:static;transform:none;max-width:none}
.player-wrap{position:relative;border-radius:10px;overflow:hidden;background:#000;aspect-ratio:16/9}
.player-wrap mux-player,.player-wrap iframe{width:100%;height:100%;display:block;border:0}
.wm-layer{position:absolute;right:14px;top:12px;font-size:11.5px;color:#fff;opacity:.55;pointer-events:none;z-index:3;text-shadow:0 1px 3px rgba(0,0,0,.6)}
.speaker-photo img{width:100%;height:100%;object-fit:cover;border-radius:50%}
.btn[aria-busy="true"]{opacity:.6;pointer-events:none}