/* ============================================================
   AI Class 柔和主題 + 黃金課程樣式
   只用覆寫的方式套在既有介面上，不修改原本的 HTML 結構。
   色系來自小金豬頭貼：奶油底、奶油黃、抹茶綠、腮紅粉。
   ============================================================ */
:root{
  --bg:#fbf8f1;
  --surface:#ffffff;
  --soft:#fdf9ee;
  --text:#2b3330;
  --muted:#7a847f;
  --line:#ece6d8;
  --accent:#4f8a6b;
  --accent-soft:#e7f3ec;
  --warm:#c9782a;
  --warm-soft:#fff3e2;
  --danger:#c2504f;
  --danger-soft:#fff0ef;
  --radius:22px;
  --butter:#f6c945;
  --butter-soft:#fff6d1;
  --blush:#f2a0a8;
  --blush-soft:#fde9eb;
  --sky:#a9d3e8;
  --sky-soft:#e9f4fa;
  --gold:#e0a628;
  --gold-soft:#fff2cc;
  --shadow:0 10px 30px rgba(90,80,50,.08);
  --shadow-hover:0 18px 40px rgba(90,80,50,.14);
  --body:"PingFang TC","Microsoft JhengHei UI","Microsoft JhengHei","Noto Sans TC",system-ui,-apple-system,sans-serif;
  --display:ui-rounded,"SF Pro Rounded","PingFang TC","Microsoft JhengHei UI","Microsoft JhengHei","Noto Sans TC",system-ui,sans-serif;
}
body{
  font-family:var(--body);
  background:
    radial-gradient(900px 500px at -10% -10%, rgba(246,201,69,.18), transparent 60%),
    radial-gradient(700px 400px at 110% 0%, rgba(242,160,168,.16), transparent 60%),
    radial-gradient(800px 600px at 50% 120%, rgba(79,138,107,.10), transparent 60%),
    var(--bg);
}
h1,h2,h3,h4,.brand h1,.lesson-head h2{font-family:var(--display);letter-spacing:.01em}
.sidebar{background:rgba(255,255,255,.82);backdrop-filter:blur(14px);border-right:1px solid var(--line)}
.brand{background:rgba(255,255,255,.7)}
.mark{background:linear-gradient(135deg,var(--butter),#f09b3a);color:#3a2a00;border-radius:14px;box-shadow:0 6px 14px rgba(240,155,58,.35)}
.profile-avatar{background:var(--butter-soft);border-color:#ffe8a3!important;border-radius:18px!important}
.progress-track{background:#f1ecdf;border-radius:999px;overflow:hidden}
.progress-bar{background:linear-gradient(90deg,var(--accent),#8cc7a6);border-radius:999px}
.dashboard-button{border-radius:14px;transition:transform .18s ease,box-shadow .18s ease}
.dashboard-button:hover{transform:translateY(-1px);box-shadow:var(--shadow)}
.lesson-link{border-radius:14px;transition:background .18s ease,transform .18s ease}
.lesson-link:hover{background:var(--butter-soft);transform:translateX(2px)}
.lesson-link[aria-current="page"]{background:var(--accent-soft)}
.reader{animation:gold-fade .45s ease both}
.content-section,.quiz-card,.pending-card,.note-card,.stat-card,.dashboard-section,.result-item,.question-card{border-radius:var(--radius);box-shadow:var(--shadow);border-color:var(--line)}
.content-section:hover{box-shadow:var(--shadow-hover)}
.section-index{background:linear-gradient(135deg,var(--butter),#f0b23a);color:#3a2a00;border-radius:12px}
.example{background:var(--sky-soft);border-radius:16px}
.memory{background:var(--butter-soft);border-radius:16px}
.trap{background:var(--blush-soft);border-radius:16px}
.flow{background:var(--accent-soft);border-radius:16px}
.badge{border-radius:999px}
.primary-button,.secondary-button,.control-button{border-radius:999px;transition:transform .18s ease,box-shadow .18s ease,filter .18s ease}
.primary-button:hover,.secondary-button:hover,.control-button:hover{transform:translateY(-2px);box-shadow:var(--shadow-hover);filter:saturate(1.05)}
.primary-button{background:linear-gradient(135deg,var(--accent),#6aa886)}
.option{border-radius:14px;transition:background .15s ease,transform .15s ease}
.option:hover{background:var(--butter-soft);transform:translateX(2px)}
table{border-radius:14px;overflow:hidden}
th{background:var(--soft)}
@keyframes gold-fade{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}
@keyframes gold-pop{0%{transform:scale(.92);opacity:0}60%{transform:scale(1.03)}100%{transform:scale(1);opacity:1}}
@keyframes gold-float{0%,100%{transform:translateY(0)}50%{transform:translateY(-6px)}}
@keyframes gold-shimmer{0%{background-position:0% 50%}100%{background-position:200% 50%}}

/* ---------- 側欄：黃金課程群組 ---------- */
.gold-nav-group{margin-top:14px;padding:12px 10px 10px;background:linear-gradient(160deg,var(--gold-soft),#fff9e6 60%,#fff);border:1px solid #f5e3a6;border-radius:20px}
.gold-nav-title{display:flex;align-items:center;gap:8px;margin:0 6px 8px;font-family:var(--display);font-size:14px;font-weight:900;color:#7a5200}
.gold-nav-title .gold-star{width:18px;height:18px;flex:0 0 auto}
.gold-nav-scope{margin:10px 6px 4px;font-size:11px;font-weight:700;letter-spacing:.06em;color:#9a7a2a}
.gold-link{display:flex;width:100%;align-items:center;gap:8px;padding:8px 10px;margin:2px 0;text-align:left;background:transparent;border:0;border-radius:12px;color:var(--text);cursor:pointer;font-size:13px;line-height:1.4;transition:background .18s ease,transform .18s ease}
.gold-link:hover{background:#fff;transform:translateX(2px)}
.gold-link[aria-current="page"]{background:#fff;box-shadow:0 4px 12px rgba(224,166,40,.18)}
.gold-link .number{flex:0 0 auto;width:26px;height:26px;display:grid;place-items:center;background:var(--gold-soft);border-radius:9px;font-size:11px;font-weight:800;color:#8a5f00}
.gold-link.done .number{background:var(--accent);color:#fff}
.gold-link .name{flex:1 1 auto;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.gold-link.home{font-weight:800;color:#7a5200}
.gold-link.home .number{background:linear-gradient(135deg,var(--butter),#f0b23a);color:#3a2a00}
.gold-link.tool .number{background:var(--sky-soft);color:#2a5a75}
.gold-nav-toggle{display:flex;width:100%;align-items:center;justify-content:space-between;padding:6px 8px;margin:6px 0 0;background:transparent;border:0;border-radius:10px;color:#9a7a2a;cursor:pointer;font-size:11px;font-weight:700;letter-spacing:.06em}
.gold-nav-toggle:hover{background:#fff}
.gold-nav-toggle .chev{transition:transform .2s ease}
.gold-nav-toggle[aria-expanded="false"] .chev{transform:rotate(-90deg)}
.gold-nav-list[hidden]{display:none}
.mobile-controls .gold-mobile{grid-column:1 / -1}

/* ---------- 黃金課程頁面共用 ---------- */
.gold-badge{display:inline-flex;align-items:center;gap:6px;padding:4px 12px;background:linear-gradient(135deg,var(--gold-soft),#ffe7a3);color:#7a5200;border-radius:999px;font-size:12px;font-weight:800}
.gold-sync{display:inline-flex;align-items:center;gap:7px;width:max-content;margin-top:8px;padding:4px 10px;border:1px solid var(--line);border-radius:999px;background:var(--surface);color:var(--muted);font-size:12px;font-weight:700}
.gold-sync::before{content:"";width:7px;height:7px;border-radius:50%;background:var(--muted)}
.gold-sync[data-state="synced"]{color:var(--accent);border-color:#cfe4d8;background:var(--accent-soft)}
.gold-sync[data-state="synced"]::before{background:var(--accent)}
.gold-sync[data-state="syncing"]::before{background:var(--gold);animation:gold-float 1s ease-in-out infinite}
.gold-sync[data-state="offline"]{color:var(--warm);border-color:#f1d2ad;background:var(--warm-soft)}
.gold-sync[data-state="offline"]::before{background:var(--warm)}
.gold-hero{position:relative;overflow:hidden;padding:30px 30px 26px;margin-bottom:20px;background:linear-gradient(135deg,#fff8e1 0%,#fff 55%,#eef8f2 100%);border:1px solid #f5e3a6;border-radius:28px;box-shadow:var(--shadow);animation:gold-pop .5s ease both}
.gold-hero::before{content:"";position:absolute;right:-60px;top:-60px;width:220px;height:220px;background:radial-gradient(circle,rgba(246,201,69,.35),transparent 65%);border-radius:50%}
.gold-hero::after{content:"";position:absolute;left:-40px;bottom:-70px;width:200px;height:200px;background:radial-gradient(circle,rgba(242,160,168,.28),transparent 65%);border-radius:50%}
.gold-hero>*{position:relative;z-index:1}
.gold-hero-row{display:flex;align-items:center;gap:18px;flex-wrap:wrap}
.gold-hero-avatar{width:84px;height:84px;object-fit:contain;background:var(--butter-soft);border:3px solid #ffe8a3;border-radius:26px;animation:gold-float 4s ease-in-out infinite}
.gold-hero h3{margin:0 0 6px;font-size:26px;line-height:1.3}
.gold-hero p{margin:0;color:var(--muted)}
.gold-hero-actions{display:flex;flex-wrap:wrap;gap:10px;margin-top:18px}
.gold-btn{display:inline-flex;align-items:center;gap:8px;padding:11px 18px;border:0;border-radius:999px;font-size:14px;font-weight:800;cursor:pointer;transition:transform .18s ease,box-shadow .18s ease,filter .18s ease}
.gold-btn:hover{transform:translateY(-2px);box-shadow:var(--shadow-hover)}
.gold-btn:disabled{opacity:.5;cursor:not-allowed;transform:none;box-shadow:none}
.gold-btn.primary{background:linear-gradient(135deg,var(--accent),#6aa886);color:#fff}
.gold-btn.gold{background:linear-gradient(135deg,var(--butter),#f0b23a);color:#3a2a00}
.gold-btn.soft{background:#fff;color:var(--text);border:1px solid var(--line)}
.gold-btn.pink{background:linear-gradient(135deg,#f7b7bd,var(--blush));color:#5a1f25}
.gold-btn svg{width:16px;height:16px}
.gold-stats{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin:0 0 20px}
.gold-stat{padding:16px;background:#fff;border:1px solid var(--line);border-radius:20px;box-shadow:var(--shadow);animation:gold-pop .5s ease both}
.gold-stat span{display:block;color:var(--muted);font-size:12px;font-weight:700}
.gold-stat strong{display:block;margin-top:4px;font-family:var(--display);font-size:26px;line-height:1.1;color:var(--accent)}
.gold-stat.gold strong{color:var(--gold)}
.gold-stat.pink strong{color:#c9606a}
.gold-ring{--p:0;width:64px;height:64px;border-radius:50%;background:conic-gradient(var(--accent) calc(var(--p)*1%),#efe9da 0);display:grid;place-items:center;flex:0 0 auto}
.gold-ring i{width:48px;height:48px;border-radius:50%;background:#fff;display:grid;place-items:center;font-style:normal;font-weight:800;font-size:13px;color:var(--accent)}
.gold-section-title{display:flex;align-items:baseline;justify-content:space-between;gap:12px;margin:26px 0 12px}
.gold-section-title h3{margin:0;font-size:20px}
.gold-section-title span{color:var(--muted);font-size:13px}
.gold-scopes{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}
.gold-scope{position:relative;display:flex;flex-direction:column;gap:8px;padding:18px 18px 16px;background:#fff;border:1px solid var(--line);border-radius:22px;box-shadow:var(--shadow);cursor:pointer;text-align:left;transition:transform .18s ease,box-shadow .18s ease;animation:gold-pop .5s ease both}
.gold-scope:hover{transform:translateY(-3px);box-shadow:var(--shadow-hover)}
.gold-scope .tag{display:inline-flex;align-self:flex-start;padding:3px 10px;border-radius:999px;font-size:11px;font-weight:800}
.gold-scope.s1 .tag{background:var(--accent-soft);color:var(--accent)}
.gold-scope.s2 .tag{background:var(--warm-soft);color:var(--warm)}
.gold-scope h4{margin:0;font-size:17px;line-height:1.4}
.gold-scope p{margin:0;color:var(--muted);font-size:13px;line-height:1.6}
.gold-scope .meta{display:flex;justify-content:space-between;align-items:center;margin-top:4px;font-size:12px;color:var(--muted)}
.gold-scope .bar{height:6px;background:#f1ecdf;border-radius:999px;overflow:hidden}
.gold-scope .bar i{display:block;height:100%;background:linear-gradient(90deg,var(--accent),#8cc7a6);border-radius:999px;transition:width .6s ease}
.gold-lesson-list{display:flex;flex-direction:column;gap:10px}
.gold-lesson-row{display:grid;grid-template-columns:44px 1fr auto;gap:14px;align-items:center;padding:14px 16px;background:#fff;border:1px solid var(--line);border-radius:18px;box-shadow:var(--shadow);cursor:pointer;text-align:left;transition:transform .18s ease,box-shadow .18s ease}
.gold-lesson-row:hover{transform:translateX(3px);box-shadow:var(--shadow-hover)}
.gold-lesson-row .num{width:44px;height:44px;display:grid;place-items:center;background:var(--gold-soft);border-radius:14px;font-family:var(--display);font-weight:900;color:#8a5f00}
.gold-lesson-row.done .num{background:var(--accent);color:#fff}
.gold-lesson-row strong{display:block;font-size:15px}
.gold-lesson-row small{display:block;color:var(--muted);font-size:12px;margin-top:2px}
.gold-lesson-row .right{font-size:12px;color:var(--muted);text-align:right;white-space:nowrap}

/* ---------- 課程內容區塊 ---------- */
.gold-story{position:relative;padding:18px 20px 18px 22px;margin:14px 0;background:linear-gradient(135deg,#fff8e6,#fffdf7);border:1px solid #f5e3a6;border-radius:18px;line-height:1.8}
.gold-story::before{content:"";position:absolute;left:0;top:14px;bottom:14px;width:4px;background:linear-gradient(var(--butter),#f0b23a);border-radius:4px}
.gold-story strong:first-child{display:block;margin-bottom:4px;color:#7a5200}
.gold-why{padding:16px 20px;margin:14px 0;background:var(--accent-soft);border-radius:18px;line-height:1.8}
.gold-why strong:first-child{display:block;margin-bottom:4px;color:var(--accent)}
.gold-steps{counter-reset:step;list-style:none;padding:0;margin:14px 0;display:flex;flex-direction:column;gap:8px}
.gold-steps li{position:relative;padding:10px 14px 10px 46px;background:var(--soft);border:1px solid var(--line);border-radius:14px;line-height:1.7}
.gold-steps li::before{counter-increment:step;content:counter(step);position:absolute;left:12px;top:10px;width:24px;height:24px;display:grid;place-items:center;background:linear-gradient(135deg,var(--butter),#f0b23a);border-radius:8px;font-size:12px;font-weight:900;color:#3a2a00}
.gold-terms{display:grid;grid-template-columns:repeat(2,1fr);gap:10px;margin:14px 0}
.gold-term{padding:12px 14px;background:#fff;border:1px solid var(--line);border-radius:14px}
.gold-term b{display:block;font-size:14px;color:var(--accent)}
.gold-term span{display:block;font-size:13px;color:var(--muted);line-height:1.6;margin-top:2px}
.gold-compare{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:10px;margin:14px 0}
.gold-compare>div{padding:14px;border-radius:16px;background:var(--soft);border:1px solid var(--line);line-height:1.65}
.gold-compare>div b{display:block;margin-bottom:4px;font-size:14px}
.gold-compare>div.a{background:var(--accent-soft)}
.gold-compare>div.b{background:var(--butter-soft)}
.gold-compare>div.c{background:var(--blush-soft)}
.gold-compare>div.d{background:var(--sky-soft)}

/* ---------- 題目卡 ---------- */
.gold-q-toolbar{display:flex;flex-wrap:wrap;gap:8px;align-items:center;margin:0 0 12px}
.gold-q-toolbar .spacer{flex:1}
.gold-q{padding:18px 20px;margin:0 0 12px;background:#fff;border:1px solid var(--line);border-radius:20px;box-shadow:var(--shadow);transition:box-shadow .18s ease}
.gold-q.answered{box-shadow:var(--shadow-hover)}
.gold-q-head{display:flex;justify-content:space-between;align-items:center;gap:10px;margin-bottom:8px;font-size:12px;color:var(--muted)}
.gold-q-head .chip{padding:2px 10px;border-radius:999px;background:var(--soft);border:1px solid var(--line);font-weight:700}
.gold-q-head .chip.mock{background:var(--sky-soft);border-color:#cfe6f2;color:#2a5a75}
.gold-q-head .chip.bank{background:var(--gold-soft);border-color:#f5e3a6;color:#7a5200}
.gold-q-prompt{margin:0 0 12px;font-weight:700;line-height:1.75}
.gold-opts{display:flex;flex-direction:column;gap:8px}
.gold-opt{display:grid;grid-template-columns:30px 1fr;gap:10px;align-items:start;width:100%;padding:11px 14px;background:var(--soft);border:1.5px solid var(--line);border-radius:14px;text-align:left;cursor:pointer;line-height:1.65;transition:background .15s ease,transform .15s ease,border-color .15s ease}
.gold-opt:hover{background:var(--butter-soft);transform:translateX(2px)}
.gold-opt .letter{width:26px;height:26px;display:grid;place-items:center;background:#fff;border:1px solid var(--line);border-radius:9px;font-weight:800;font-size:12px}
.gold-opt.correct{background:var(--accent-soft);border-color:var(--accent)}
.gold-opt.correct .letter{background:var(--accent);color:#fff;border-color:var(--accent)}
.gold-opt.wrong{background:var(--danger-soft);border-color:#e8a3a3}
.gold-opt.wrong .letter{background:var(--danger);color:#fff;border-color:var(--danger)}
.gold-opt.picked{border-color:var(--gold)}
.gold-opt:disabled{cursor:default;transform:none}
.gold-exp{margin-top:12px;padding:14px 16px;background:var(--butter-soft);border-radius:14px;line-height:1.75;animation:gold-fade .3s ease both}
.gold-exp b{color:#7a5200}
.gold-exp .verdict{display:inline-flex;align-items:center;gap:6px;margin-bottom:6px;font-weight:800}
.gold-exp .verdict.ok{color:var(--accent)}
.gold-exp .verdict.bad{color:var(--danger)}
.gold-exp .lesson-jump{display:inline-block;margin-top:8px;padding:5px 12px;background:#fff;border:1px solid var(--line);border-radius:999px;font-size:12px;font-weight:700;cursor:pointer}
.gold-empty{padding:24px;text-align:center;color:var(--muted);background:var(--soft);border:1px dashed var(--line);border-radius:18px}

/* ---------- 小考 / 模擬考 ---------- */
.gold-quiz-shell{margin-top:12px}
.gold-quiz-progress{display:flex;align-items:center;gap:12px;margin:0 0 14px;font-size:13px;color:var(--muted)}
.gold-quiz-progress .track{flex:1;height:8px;background:#f1ecdf;border-radius:999px;overflow:hidden}
.gold-quiz-progress .track i{display:block;height:100%;background:linear-gradient(90deg,var(--butter),#f0b23a);border-radius:999px;transition:width .3s ease}
.gold-result{display:flex;gap:18px;align-items:center;padding:22px;margin:0 0 16px;background:linear-gradient(135deg,#fff8e1,#fff);border:1px solid #f5e3a6;border-radius:24px;box-shadow:var(--shadow);animation:gold-pop .5s ease both}
.gold-result .score{flex:0 0 auto;width:96px;height:96px;display:grid;place-items:center;border-radius:50%;background:linear-gradient(135deg,var(--accent),#6aa886);color:#fff;font-family:var(--display);font-size:26px;font-weight:900;box-shadow:0 10px 24px rgba(79,138,107,.3)}
.gold-result.fail .score{background:linear-gradient(135deg,#e07a7a,var(--danger))}
.gold-result h4{margin:0 0 4px;font-size:20px}
.gold-result p{margin:0;color:var(--muted)}
.gold-result img{width:70px;height:70px;object-fit:contain;background:var(--butter-soft);border:2px solid #ffe8a3;border-radius:20px}
.gold-exam-setup{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:12px;margin:14px 0}
.gold-exam-setup label{display:flex;flex-direction:column;gap:6px;padding:14px;background:#fff;border:1px solid var(--line);border-radius:16px;font-size:13px;font-weight:700;color:var(--muted)}
.gold-exam-setup select,.gold-exam-setup input{padding:9px 12px;border:1px solid var(--line);border-radius:12px;background:var(--soft);color:var(--text);font-size:14px}
.gold-scope-checks{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:8px;margin:12px 0}
.gold-scope-checks label{display:flex;align-items:center;gap:8px;padding:9px 12px;background:#fff;border:1px solid var(--line);border-radius:12px;font-size:13px;cursor:pointer}
.gold-scope-checks input{accent-color:var(--accent)}
.gold-sticky-submit{position:sticky;bottom:14px;display:flex;justify-content:center;margin-top:14px;z-index:3}
.gold-sticky-submit .gold-btn{box-shadow:0 12px 30px rgba(60,50,20,.25)}
.gold-wrong-group{margin:0 0 18px}
.gold-wrong-group h4{margin:0 0 8px;font-size:15px}
.gold-history{width:100%;border-collapse:collapse;font-size:13px}
.gold-history th,.gold-history td{padding:9px 10px;text-align:left;border-bottom:1px solid var(--line)}
.gold-note{margin:14px 0 0;color:var(--muted);font-size:12px;line-height:1.7}
.gold-controls{display:flex;justify-content:space-between;gap:10px;margin-top:22px}
@media(max-width:820px){
  .gold-stats{grid-template-columns:repeat(2,1fr)}
  .gold-scopes{grid-template-columns:1fr}
  .gold-terms{grid-template-columns:1fr}
  .gold-hero{padding:22px}
  .gold-lesson-row{grid-template-columns:40px 1fr}
  .gold-lesson-row .right{display:none}
}
@media(prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important}}