:root{
  --p1:#7c3aed; --p2:#ec4899; --p3:#06b6d4; --p4:#f59e0b;
  --ok:#16a34a; --bad:#ef4444;
  --ink:#1e1b4b; --bg:#f5f3ff; --card:#ffffff;
}
*{box-sizing:border-box;margin:0;padding:0;-webkit-tap-highlight-color:transparent}
html,body{height:100%}
body{
  font-family:"Segoe UI","PingFang TC","Microsoft JhengHei",system-ui,sans-serif;
  color:var(--ink); background:var(--bg); overflow-x:hidden;
}
#bg-blobs span{position:fixed;border-radius:50%;filter:blur(70px);opacity:.35;z-index:-1;animation:float 14s ease-in-out infinite}
#bg-blobs span:nth-child(1){width:340px;height:340px;background:var(--p1);top:-80px;left:-60px}
#bg-blobs span:nth-child(2){width:300px;height:300px;background:var(--p3);bottom:-60px;right:-40px;animation-delay:-5s}
#bg-blobs span:nth-child(3){width:260px;height:260px;background:var(--p2);top:40%;left:60%;animation-delay:-9s}
@keyframes float{0%,100%{transform:translate(0,0)}50%{transform:translate(30px,-40px)}}

/* topbar */
.topbar{position:sticky;top:0;z-index:30;display:flex;flex-wrap:wrap;gap:10px;
  align-items:center;justify-content:space-between;padding:14px 18px;
  background:rgba(255,255,255,.72);backdrop-filter:blur(12px);border-bottom:1px solid #ede9fe}
.logo{font-size:20px;font-weight:800;background:linear-gradient(90deg,var(--p1),var(--p2));
  -webkit-background-clip:text;background-clip:text;color:transparent}
.tabs{display:flex;gap:8px}
.tab-btn{font:inherit;font-weight:700;font-size:15px;padding:9px 16px;border:0;border-radius:999px;
  background:#ede9fe;color:#5b21b6;cursor:pointer;transition:.25s}
.tab-btn:hover{transform:translateY(-2px)}
.tab-btn.active{background:linear-gradient(90deg,var(--p1),var(--p2));color:#fff;box-shadow:0 8px 20px rgba(124,58,237,.35)}

main{max-width:920px;margin:0 auto;padding:22px 16px 70px}
.tab-panel{display:none;animation:fade .4s ease}
.tab-panel.active{display:block}
@keyframes fade{from{opacity:0;transform:translateY(12px)}to{opacity:1;transform:none}}
.hidden{display:none!important}
.muted{color:#6b7280}.small{font-size:13px}

/* ---------- 學習 ---------- */
.learn-head{text-align:center;margin-bottom:18px}
.learn-head h1{font-size:30px;margin-bottom:6px}
.term-nav{display:flex;align-items:center;justify-content:center;gap:14px;margin-top:14px}
.round-btn{width:46px;height:46px;border-radius:50%;border:0;font-size:18px;cursor:pointer;
  background:#fff;box-shadow:0 6px 16px rgba(0,0,0,.12);transition:.2s}
.round-btn:hover{transform:scale(1.12);background:var(--p1);color:#fff}
.dots{display:flex;flex-wrap:wrap;gap:6px;max-width:520px;justify-content:center}
.dots i{width:11px;height:11px;border-radius:50%;background:#ddd6fe;cursor:pointer;transition:.2s}
.dots i.on{background:var(--p1);transform:scale(1.35)}

.card-stage{perspective:1400px;display:flex;justify-content:center;min-height:430px}
.flip{width:min(560px,92vw);height:420px;cursor:pointer;transform-style:preserve-3d;
  transition:transform .7s cubic-bezier(.4,.2,.2,1);animation:pop .5s ease}
@keyframes pop{from{opacity:0;transform:scale(.85)}to{opacity:1;transform:scale(1)}}
.flip.flipped{transform:rotateY(180deg)}
.face{position:absolute;inset:0;backface-visibility:hidden;border-radius:26px;padding:30px;
  display:flex;flex-direction:column;box-shadow:0 22px 50px rgba(76,29,149,.22)}
.front{background:linear-gradient(155deg,#fff,#f3e8ff)}
.back{background:linear-gradient(155deg,#0f172a,#312e81);color:#fff;transform:rotateY(180deg)}
.term-emoji{font-size:62px;text-align:center;animation:bob 3s ease-in-out infinite}
@keyframes bob{50%{transform:translateY(-10px)}}
.term-name{font-size:30px;font-weight:800;text-align:center;margin:6px 0 2px}
.term-en{text-align:center;color:#7c3aed;font-weight:600;margin-bottom:14px}
.term-def{font-size:16.5px;line-height:1.85;overflow:auto}
.term-tip{margin-top:auto;background:#fde68a;color:#92400e;font-weight:700;
  padding:10px 14px;border-radius:14px;font-size:14.5px}
.back h3{font-size:15px;color:#a5b4fc;margin-bottom:6px;letter-spacing:2px}
.eg-text{font-size:18px;line-height:1.9}
.flip-hint{position:absolute;bottom:12px;right:18px;font-size:12px;opacity:.55}
.learn-foot{text-align:center;margin-top:26px}

/* ---------- 共用按鈕 ---------- */
.big-btn{font:inherit;font-weight:800;font-size:18px;color:#fff;border:0;cursor:pointer;
  padding:15px 34px;border-radius:999px;background:linear-gradient(90deg,var(--p1),var(--p2));
  box-shadow:0 12px 28px rgba(236,72,153,.4);transition:.2s}
.big-btn:hover{transform:translateY(-3px) scale(1.03)}
.big-btn:active{transform:scale(.97)}
.pulse{animation:pulse 1.8s infinite}
@keyframes pulse{0%,100%{box-shadow:0 12px 28px rgba(236,72,153,.4)}50%{box-shadow:0 12px 40px rgba(236,72,153,.75)}}
.mini-btn{font:inherit;font-weight:700;font-size:14px;border:0;border-radius:10px;cursor:pointer;
  padding:9px 14px;background:var(--p3);color:#fff;transition:.2s}
.mini-btn:hover{filter:brightness(1.08);transform:translateY(-2px)}
.mini-btn.ghost{background:#e5e7eb;color:#374151}

/* ---------- 測驗 ---------- */
.quiz-stage{display:flex;justify-content:center}
.hero-card{background:var(--card);border-radius:26px;padding:38px 30px;width:min(560px,94vw);
  text-align:center;box-shadow:0 22px 50px rgba(76,29,149,.16);animation:pop .45s ease}
.hero-card h1{font-size:30px;margin-bottom:8px}
.field-label{display:block;font-weight:700;margin:22px 0 8px;text-align:left}
.seat-select{width:100%;font:inherit;font-size:17px;padding:13px 14px;border:2px solid #ddd6fe;
  border-radius:14px;background:#faf5ff;outline:none}
.seat-select:focus{border-color:var(--p1)}
.seat-select.inline{width:auto;padding:9px 12px;font-size:15px}
.seat-name{min-height:24px;margin:10px 0 4px;font-weight:700;color:var(--p1)}
.seat-name.empty{color:#9ca3af;font-weight:500}

.quiz-stage>div{width:100%}
.play-wrap{width:100%}
.quiz-topbar{display:flex;align-items:center;gap:14px;margin-bottom:12px}
.q-progress{font-weight:800;font-size:18px;white-space:nowrap}
.q-score{font-weight:800;font-size:18px;color:var(--p4);white-space:nowrap;margin-left:auto}

/* 連擊徽章 */
.combo{font-weight:900;font-size:17px;padding:7px 16px;border-radius:999px;
  background:linear-gradient(90deg,#f97316,#ef4444);color:#fff;white-space:nowrap;
  box-shadow:0 6px 18px rgba(239,68,68,.45);transition:.2s}
.combo.off{background:#e5e7eb;color:#9ca3af;box-shadow:none}
.combo .cf{display:inline-block}
.combo.bump{animation:comboBump .42s cubic-bezier(.3,1.4,.4,1)}
@keyframes comboBump{0%{transform:scale(1)}45%{transform:scale(1.45) rotate(-4deg)}100%{transform:scale(1)}}
.combo.break{animation:comboBreak .5s}
@keyframes comboBreak{0%,100%{transform:translateX(0)}20%{transform:translateX(-7px)}40%{transform:translateX(7px)}60%{transform:translateX(-5px)}80%{transform:translateX(5px)}}

/* 連擊飄字 */
.combo-pop{position:fixed;left:50%;top:34%;transform:translate(-50%,-50%);
  font-size:46px;font-weight:900;color:#f97316;text-shadow:0 4px 0 #fff,0 0 22px rgba(249,115,22,.7);
  pointer-events:none;z-index:75;animation:comboPop 1s ease-out forwards}
@keyframes comboPop{0%{opacity:0;transform:translate(-50%,-30%) scale(.4)}
  30%{opacity:1;transform:translate(-50%,-55%) scale(1.15)}
  100%{opacity:0;transform:translate(-50%,-95%) scale(1)}}

/* 全寬計時時間軸（題目上方） */
.timer-line{width:100%;height:16px;background:#ede9fe;border-radius:999px;
  overflow:hidden;margin-bottom:16px;box-shadow:inset 0 1px 3px rgba(0,0,0,.12)}
.timer-bar{height:100%;width:100%;background:linear-gradient(90deg,var(--p3),var(--p1));
  transition:width .15s linear}
.timer-bar.warn{background:linear-gradient(90deg,#f59e0b,#ef4444);
  animation:timerPulse .6s infinite}
@keyframes timerPulse{50%{opacity:.65}}

/* 老師題數設定卡 */
.settings-card{background:var(--card);border-radius:16px;padding:16px 18px;margin-bottom:18px;
  box-shadow:0 10px 24px rgba(76,29,149,.1)}
.settings-card>b{font-size:16px}
.settings-row{display:flex;flex-wrap:wrap;align-items:center;gap:14px;margin-top:12px}
.settings-row label{font-weight:700;display:flex;align-items:center;gap:6px}
.settings-row input{width:78px;font:inherit;font-size:16px;padding:8px 10px;
  border:2px solid #ddd6fe;border-radius:10px;background:#faf5ff;text-align:center}
.settings-row input:focus{outline:none;border-color:var(--p1)}

.q-card{background:var(--card);border-radius:24px;padding:26px;box-shadow:0 18px 40px rgba(76,29,149,.15);
  animation:slide .35s ease}
@keyframes slide{from{opacity:0;transform:translateX(40px)}to{opacity:1;transform:none}}
.q-type{font-size:13px;font-weight:800;letter-spacing:1px;color:var(--p2);margin-bottom:8px}
.q-text{font-size:20px;font-weight:700;line-height:1.7;white-space:pre-wrap;margin-bottom:20px}
.opts{display:grid;gap:12px}
@media(min-width:560px){.opts{grid-template-columns:1fr 1fr}}
.opt{font:inherit;font-size:17px;font-weight:600;text-align:left;border:0;cursor:pointer;
  padding:16px 18px;border-radius:16px;color:#fff;transition:.18s;display:flex;gap:10px;align-items:center}
.opt:hover{transform:translateY(-3px)}
.opt:disabled{cursor:default}
.opt span.k{width:30px;height:30px;flex:none;border-radius:9px;background:rgba(255,255,255,.28);
  display:grid;place-items:center;font-weight:800}
.opt:nth-child(1){background:#ef4444}.opt:nth-child(2){background:#3b82f6}
.opt:nth-child(3){background:#f59e0b}.opt:nth-child(4){background:#16a34a}
.opt.correct{outline:5px solid #bbf7d0;animation:popc .4s}
.opt.wrong{opacity:.45;filter:grayscale(.4)}
@keyframes popc{50%{transform:scale(1.06)}}

/* 填空拖放 */
.fill-text{font-size:21px;font-weight:700;line-height:2.3;margin-bottom:22px}
.blank{display:inline-block;min-width:120px;padding:4px 10px;margin:0 4px;border-bottom:4px dashed var(--p1);
  text-align:center;color:var(--p1);font-weight:800;transition:.2s;border-radius:6px}
.blank.over{background:#ede9fe;border-bottom-style:solid}
.blank.filled{border-bottom-style:solid;background:#ddd6fe}
.blank.right{background:#bbf7d0;border-color:var(--ok);color:#15803d}
.blank.wrong{background:#fecaca;border-color:var(--bad);color:#b91c1c}
.bank{display:flex;flex-wrap:wrap;gap:10px;justify-content:center;margin-top:6px}
.chip{font:inherit;font-size:16px;font-weight:700;padding:11px 16px;border-radius:14px;cursor:grab;
  background:linear-gradient(90deg,var(--p3),var(--p1));color:#fff;user-select:none;touch-action:none;
  box-shadow:0 6px 16px rgba(124,58,237,.3);transition:.15s}
.chip:active{cursor:grabbing}
.chip.dragging{opacity:.5;transform:scale(1.1)}
.chip.used{visibility:hidden}
.fill-actions{margin-top:24px;text-align:center}

.feedback{margin-top:18px;padding:14px 16px;border-radius:14px;font-weight:600;line-height:1.7;
  animation:fade .3s}
.feedback.ok{background:#dcfce7;color:#166534}
.feedback.no{background:#fee2e2;color:#991b1b}

.end-emoji{font-size:64px;animation:bob 2.4s ease-in-out infinite}
.score-big{font-size:54px;font-weight:900;margin:8px 0;
  background:linear-gradient(90deg,var(--p1),var(--p2));-webkit-background-clip:text;
  background-clip:text;color:transparent}
.review-box{text-align:left;max-height:230px;overflow:auto;margin:18px 0;border-radius:14px;
  background:#faf5ff;padding:6px}
.review-box .r{padding:10px 12px;border-bottom:1px solid #ede9fe;font-size:14px;line-height:1.6}
.review-box .r:last-child{border:0}
.review-box .tag{font-weight:800;margin-right:6px}
.review-box .tag.ok{color:var(--ok)}.review-box .tag.no{color:var(--bad)}

/* ---------- 管理 ---------- */
.admin-toolbar{display:flex;flex-wrap:wrap;gap:10px;align-items:center;margin-bottom:18px}
.stat-cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(140px,1fr));gap:12px;margin-bottom:18px}
.stat{background:var(--card);border-radius:16px;padding:16px;box-shadow:0 10px 24px rgba(76,29,149,.1)}
.stat b{display:block;font-size:26px;color:var(--p1)}
.stat small{color:#6b7280}
.table-wrap{background:var(--card);border-radius:16px;padding:8px;overflow:auto;
  box-shadow:0 10px 24px rgba(76,29,149,.1)}
table{width:100%;border-collapse:collapse;font-size:14.5px;min-width:640px}
th,td{padding:11px 12px;text-align:center;border-bottom:1px solid #f1f0fb}
th{background:#f5f3ff;color:#5b21b6;font-weight:800;position:sticky;top:0}
tbody tr:hover{background:#faf5ff}

/* ---------- 排行榜 ---------- */
.lb-card{background:var(--card);border-radius:16px;padding:16px 18px;margin-bottom:18px;
  box-shadow:0 10px 24px rgba(76,29,149,.1)}
.lb-head{display:flex;flex-wrap:wrap;align-items:center;gap:12px;margin-bottom:14px}
.lb-head>b{font-size:18px}
.podium{display:flex;justify-content:center;align-items:flex-end;gap:12px;
  margin:18px 0 22px;min-height:90px;flex-wrap:wrap}
.pod{flex:0 0 132px;border-radius:16px 16px 8px 8px;padding:12px 8px;text-align:center;
  color:#fff;animation:rise .55s cubic-bezier(.3,1.3,.4,1) both}
.pod .medal{font-size:30px}
.pod .nm{font-weight:800;font-size:15px;margin:4px 0;line-height:1.3}
.pod .sc{font-weight:900;font-size:22px}
.pod.p1{background:linear-gradient(160deg,#fbbf24,#f59e0b);height:128px;flex-basis:150px;
  box-shadow:0 12px 26px rgba(245,158,11,.45)}
.pod.p2{background:linear-gradient(160deg,#cbd5e1,#94a3b8);height:104px}
.pod.p3{background:linear-gradient(160deg,#fdba74,#c2845a);height:88px}
.pod.p1{animation-delay:.15s}.pod.p3{animation-delay:.05s}
@keyframes rise{from{opacity:0;transform:translateY(40px) scale(.8)}to{opacity:1;transform:none}}
.lb-list{display:flex;flex-direction:column;gap:8px}
.lb-row{display:flex;align-items:center;gap:14px;padding:11px 16px;border-radius:12px;
  background:#faf5ff;font-weight:600;animation:slideIn .35s both}
@keyframes slideIn{from{opacity:0;transform:translateX(-20px)}to{opacity:1;transform:none}}
.lb-row .rk{font-weight:900;font-size:18px;width:38px;color:var(--p1)}
.lb-row .who{flex:1;font-weight:700}
.lb-row .meta{color:#6b7280;font-size:13px;font-weight:500}
.lb-row .pts{font-weight:900;font-size:19px;color:var(--p4)}
.lb-row.me1{background:linear-gradient(90deg,#fef3c7,#fde68a)}
.lb-empty{color:#9ca3af;text-align:center;padding:18px}

/* 大螢幕投影模式 */
.projection{position:fixed;inset:0;z-index:90;overflow:auto;
  background:linear-gradient(160deg,#312e81,#7c3aed 55%,#ec4899);
  color:#fff;padding:34px 20px 60px;text-align:center}
.proj-close{position:fixed;top:18px;right:18px;font:inherit;font-weight:800;
  border:0;border-radius:999px;padding:10px 18px;cursor:pointer;
  background:rgba(255,255,255,.22);color:#fff}
.proj-close:hover{background:rgba(255,255,255,.38)}
.proj-title{font-size:clamp(28px,4vw,52px);margin-bottom:26px;
  text-shadow:0 4px 0 rgba(0,0,0,.18)}
.proj-body{max-width:900px;margin:0 auto;display:flex;flex-direction:column;gap:14px}
.proj-row{display:flex;align-items:center;gap:20px;background:rgba(255,255,255,.14);
  border-radius:18px;padding:16px 26px;font-size:clamp(18px,2.4vw,30px);font-weight:800;
  backdrop-filter:blur(4px);animation:rise .5s both}
.proj-row .rk{width:64px;font-size:clamp(22px,3vw,40px)}
.proj-row .who{flex:1;text-align:left}
.proj-row .pts{font-size:clamp(22px,3vw,40px)}
.proj-row.t1{background:linear-gradient(90deg,#fbbf24,#f59e0b);color:#3b2400}
.proj-row.t2{background:linear-gradient(90deg,#e2e8f0,#94a3b8);color:#1e293b}
.proj-row.t3{background:linear-gradient(90deg,#fdba74,#c2845a);color:#3a2410}

.toast{position:fixed;left:50%;bottom:32px;transform:translateX(-50%) translateY(120px);
  background:#1e1b4b;color:#fff;padding:13px 22px;border-radius:14px;font-weight:700;
  z-index:80;transition:transform .35s;box-shadow:0 12px 30px rgba(0,0,0,.3)}
.toast.show{transform:translateX(-50%) translateY(0)}
#confetti{position:fixed;inset:0;pointer-events:none;z-index:70}

/* ============================================================
   Liquid glass — 全站玻璃面板
   ============================================================ */
.hero-card,.q-card,.lb-card,.settings-card,.stat,.table-wrap,
.review-wrap,.rv-panel,.glass{
  background:rgba(255,255,255,.55)!important;
  backdrop-filter:blur(18px) saturate(170%);
  -webkit-backdrop-filter:blur(18px) saturate(170%);
  border:1px solid rgba(255,255,255,.65);
  box-shadow:0 12px 40px rgba(76,29,149,.18),
             inset 0 1px 0 rgba(255,255,255,.85),
             inset 0 -1px 0 rgba(124,58,237,.08);
}
.q-card,.hero-card,.lb-card,.settings-card,.review-wrap{
  position:relative;overflow:hidden;isolation:isolate}
.q-card::before,.hero-card::before,.lb-card::before,.review-wrap::before{
  content:"";position:absolute;top:-60%;left:-30%;width:80%;height:160%;
  background:linear-gradient(120deg,rgba(255,255,255,.35),rgba(255,255,255,0) 60%);
  transform:rotate(8deg);pointer-events:none;z-index:-1}
/* 確保所有互動元素都在玻璃反光之上，不被蓋住 */
.q-card>*,.hero-card>*,.lb-card>*,.settings-card>*,.review-wrap>*{
  position:relative;z-index:1}
.combo,.opt,.chip,.big-btn,.mini-btn{backdrop-filter:saturate(140%)}

/* ---------- 題目檢討（玻璃） ---------- */
.review-wrap{border-radius:18px;padding:14px;margin:16px 0;text-align:left}
.review-bar{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:10px}
.rv-tab,.rv-copy{font:inherit;font-weight:800;font-size:14px;cursor:pointer;
  border:1px solid rgba(124,58,237,.25);border-radius:999px;padding:8px 15px;
  background:rgba(255,255,255,.6);color:#5b21b6;transition:.18s}
.rv-tab:hover,.rv-copy:hover{transform:translateY(-2px);background:#fff}
.rv-tab.on{background:linear-gradient(90deg,var(--p1),var(--p2));color:#fff;
  border-color:transparent;box-shadow:0 6px 16px rgba(124,58,237,.35)}
.rv-copy{color:#0e7490;border-color:rgba(6,182,212,.35)}
.review-box{max-height:340px;overflow:auto;display:flex;flex-direction:column;gap:10px;
  padding:2px}
.rv-panel{border-radius:16px!important;padding:14px 16px;animation:slideIn .3s both}
.rv-panel.no{border-left:5px solid var(--bad)!important}
.rv-panel.ok{border-left:5px solid var(--ok)!important}
.rv-head{display:flex;align-items:center;gap:10px;margin-bottom:7px}
.rv-badge{font-weight:800;font-size:12.5px;padding:3px 11px;border-radius:999px;color:#fff}
.rv-badge.ok{background:var(--ok)}.rv-badge.no{background:var(--bad)}
.rv-no{font-size:13px;color:#6b7280;font-weight:700}
.rv-q{font-weight:700;line-height:1.7;margin-bottom:7px;white-space:pre-wrap}
.rv-ans{font-size:14.5px;line-height:1.7;margin-bottom:5px}
.rv-ans .hl{color:var(--bad)}
.rv-exp{font-size:13.5px;color:#4b5563;line-height:1.7;
  background:rgba(124,58,237,.07);border-radius:10px;padding:8px 11px}
.rv-empty{text-align:center;color:#6b7280;padding:26px;font-weight:700}

/* checkbox 設定 */
#reshuffleWrap{font-weight:700;display:flex;align-items:center;gap:7px}
#reshuffleWrap input{width:18px;height:18px;accent-color:var(--p1)}

/* 深色玻璃（學習卡背面維持原本深色，不套用白玻璃） */
.face.back{background:linear-gradient(155deg,#0f172a,#312e81)!important}

/* ---------- 測試帳號答案顯示 ---------- */
.reveal-banner{background:linear-gradient(90deg,#f59e0b,#ef4444);color:#fff;
  font-weight:800;padding:9px 14px;border-radius:12px;margin-bottom:12px;font-size:14.5px}
.opt.reveal{outline:4px solid #fde68a;position:relative}
.ans-tag{margin-left:auto;background:rgba(255,255,255,.35);font-size:12.5px;
  font-weight:800;padding:3px 9px;border-radius:999px}
.chip.reveal{outline:3px solid #fde68a;box-shadow:0 0 0 4px rgba(245,158,11,.35),
  0 6px 16px rgba(124,58,237,.3)}

/* ---------- 排行榜分析 ---------- */
.lb-stats{margin-top:18px;border-top:1px dashed rgba(124,58,237,.25);padding-top:16px}
.lb-stat-row{display:flex;flex-wrap:wrap;gap:10px;margin-bottom:14px}
.lb-kpi{flex:1 1 90px;text-align:center;background:rgba(255,255,255,.5);
  border:1px solid rgba(255,255,255,.6);border-radius:12px;padding:10px 6px}
.lb-kpi b{display:block;font-size:21px;color:var(--p1)}
.lb-kpi small{color:#6b7280;font-size:12px}
.lb-dist{display:flex;flex-direction:column;gap:8px}
.dist-row{display:flex;align-items:center;gap:10px;font-size:13.5px;font-weight:700}
.dist-lb{width:128px;flex:none;color:#4b5563}
.dist-bar{flex:1;height:18px;background:rgba(124,58,237,.1);border-radius:999px;overflow:hidden}
.dist-bar i{display:block;height:100%;border-radius:999px;
  background:linear-gradient(90deg,var(--p3),var(--p1));transition:width .5s}
.dist-n{width:48px;flex:none;text-align:right;color:var(--p1)}