/* ===================================================
   捷克語旅遊速成 — 全寬版面
   配色取自捷克國旗：藍 / 紅 / 白
   =================================================== */
:root{
  --bg:#0f1420; --bg2:#161d2e; --card:#1c2438; --card2:#232c44;
  --line:#2a3450;
  --txt:#e8edf7; --muted:#8b96b0; --dim:#5b6480;
  --blue:#3b6fd4; --blue-l:#5b8def; --red:#d6455a; --green:#3fbf7f;
  --gold:#f0b840; --white:#f4f7ff;
  --radius:16px; --shadow:0 6px 24px rgba(0,0,0,.32);
}
*{box-sizing:border-box;margin:0;padding:0}
html,body{height:100%}
body{
  background:linear-gradient(160deg,#0f1420,#11182a 60%,#0d1322);
  color:var(--txt);
  font-family:"Segoe UI","PingFang TC","Microsoft JhengHei",system-ui,sans-serif;
  line-height:1.55; -webkit-font-smoothing:antialiased;
}
a{color:var(--blue-l);text-decoration:none}
button{font-family:inherit;cursor:pointer;border:none;color:inherit}
.hidden{display:none !important}

/* ── 整體格線：側邊欄 + 主內容（全寬） ── */
.app{display:grid;grid-template-columns:300px 1fr;min-height:100vh}

/* ── 側邊欄 ── */
.sidebar{
  background:var(--bg2);border-right:1px solid var(--line);
  padding:22px 20px;display:flex;flex-direction:column;gap:20px;
  position:sticky;top:0;height:100vh;overflow-y:auto;
}
.brand{display:flex;align-items:center;gap:10px;font-weight:800;font-size:19px}
.brand .flag{width:34px;height:23px;border-radius:4px;overflow:hidden;display:inline-grid;
  grid-template-rows:1fr 1fr;position:relative;box-shadow:0 1px 4px rgba(0,0,0,.4)}
.brand .flag::before{content:"";background:var(--white)}
.brand .flag::after{content:"";background:var(--red)}
.brand .flag i{position:absolute;left:0;top:0;width:55%;height:100%;
  background:var(--blue);clip-path:polygon(0 0,100% 50%,0 100%)}

.level-card{background:linear-gradient(135deg,var(--blue),#2a4fa0);border-radius:var(--radius);
  padding:16px;text-align:center;box-shadow:var(--shadow)}
.level-card .icon{font-size:40px;line-height:1}
.level-card .lv{font-size:13px;color:#cfe0ff;margin-top:4px}
.level-card .name{font-size:18px;font-weight:800}
.level-card .cz{font-size:12px;color:#cfe0ff;font-style:italic}

.bars{display:flex;flex-direction:column;gap:14px}
.bar-row .bar-top{display:flex;justify-content:space-between;font-size:12.5px;color:var(--muted);margin-bottom:5px}
.bar-row .bar-top b{color:var(--txt);font-weight:700}
.track{height:9px;background:#0d1322;border-radius:6px;overflow:hidden}
.fill{height:100%;border-radius:6px;transition:width .5s ease}
.fill.blue{background:linear-gradient(90deg,var(--blue),var(--blue-l))}
.fill.green{background:linear-gradient(90deg,#2e9e64,var(--green))}
.fill.gold{background:linear-gradient(90deg,#d99a2b,var(--gold))}

.side-title{font-size:12px;letter-spacing:1px;color:var(--dim);text-transform:uppercase;margin-bottom:8px}
.nav{display:flex;flex-direction:column;gap:4px}
.nav button{display:flex;align-items:center;gap:10px;padding:10px 12px;border-radius:10px;
  background:transparent;color:var(--muted);font-size:14.5px;text-align:left;width:100%;transition:.15s}
.nav button:hover{background:var(--card)}
.nav button.active{background:var(--card2);color:var(--txt);font-weight:700}
.nav button .em{font-size:18px}

.ach-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:6px}
.ach{aspect-ratio:1;display:grid;place-items:center;font-size:18px;background:var(--card);
  border-radius:9px;opacity:.28;filter:grayscale(1);position:relative;transition:.2s}
.ach.on{opacity:1;filter:none;background:var(--card2);box-shadow:0 0 0 1px var(--gold)}

.auth-box{margin-top:auto;background:var(--card);border-radius:12px;padding:12px;font-size:13px}
.auth-box input{width:100%;padding:8px 10px;margin:4px 0;background:#0d1322;border:1px solid var(--line);
  border-radius:8px;color:var(--txt);font-size:13px}
.auth-box .row{display:flex;gap:6px}
.auth-box button{flex:1;padding:8px;border-radius:8px;background:var(--blue);font-weight:700;font-size:13px}
.auth-box button.ghost{background:var(--card2)}
.auth-box .muted{color:var(--muted);font-size:12px}

/* ── 主內容（全寬） ── */
.main{padding:26px 34px 60px;max-width:100%;width:100%}
.topbar{display:flex;align-items:center;justify-content:space-between;margin-bottom:22px;flex-wrap:wrap;gap:12px}
.topbar h1{font-size:24px;font-weight:800}
.topbar .sub{color:var(--muted);font-size:14px}
.pills{display:flex;gap:10px;flex-wrap:wrap}
.pill{background:var(--card);border:1px solid var(--line);border-radius:999px;padding:7px 14px;font-size:13px;
  display:flex;align-items:center;gap:7px}
.pill b{color:var(--gold)}

.grid{display:grid;gap:18px}
.cols-2{grid-template-columns:1.4fr 1fr}
.cols-3{grid-template-columns:repeat(3,1fr)}
@media(max-width:1100px){.cols-2,.cols-3{grid-template-columns:1fr}}

.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:22px;box-shadow:var(--shadow)}
.card h2{font-size:17px;margin-bottom:14px;display:flex;align-items:center;gap:8px}
.card .lead{color:var(--muted);font-size:14px}

/* 圓餅圖（今日進度 %） */
.donut-wrap{display:flex;align-items:center;gap:22px}
.donut{--p:0;width:128px;height:128px;border-radius:50%;flex:none;
  background:conic-gradient(var(--green) calc(var(--p)*1%),#0d1322 0);
  display:grid;place-items:center;position:relative}
.donut::before{content:"";position:absolute;inset:14px;border-radius:50%;background:var(--card)}
.donut .pct{position:relative;font-size:26px;font-weight:800}
.donut .pct small{display:block;font-size:11px;color:var(--muted);font-weight:500}
.donut-stats{display:flex;flex-direction:column;gap:10px;font-size:14px}
.donut-stats .k{color:var(--muted)}
.donut-stats b{font-size:18px}

/* 今日句子卡 */
.sentence{font-size:30px;font-weight:800;letter-spacing:.3px;margin:6px 0 2px}
.sentence-zh{color:var(--muted);font-size:16px}
.sentence-ph{color:var(--gold);font-size:14px;margin-top:4px}
.scene-tag{display:inline-block;background:var(--card2);border-radius:999px;padding:3px 11px;font-size:12px;color:var(--blue-l)}
.words{display:flex;flex-wrap:wrap;gap:10px;margin-top:16px}
.word{background:var(--card2);border:1px solid var(--line);border-radius:10px;padding:9px 13px;cursor:pointer;transition:.15s}
.word:hover{border-color:var(--blue)}
.word b{font-size:15px}
.word span{display:block;color:var(--muted);font-size:12.5px}

.btn{background:var(--blue);color:#fff;border-radius:10px;padding:11px 18px;font-weight:700;font-size:14.5px;transition:.15s;display:inline-flex;align-items:center;gap:8px}
.btn:hover{background:var(--blue-l)}
.btn.lg{padding:14px 24px;font-size:16px}
.btn.ghost{background:var(--card2);color:var(--txt)}
.btn.green{background:var(--green)}
.btn.red{background:var(--red)}
.btn-row{display:flex;gap:10px;flex-wrap:wrap;margin-top:18px}

/* 練習題 */
.quiz{max-width:720px;margin:0 auto}
.quiz .progress-mini{height:6px;background:#0d1322;border-radius:6px;overflow:hidden;margin-bottom:18px}
.quiz .progress-mini i{display:block;height:100%;background:var(--blue);transition:.3s}
.q-skill{font-size:12px;color:var(--blue-l);letter-spacing:1px;text-transform:uppercase}
.q-text{font-size:26px;font-weight:800;margin:8px 0 20px;min-height:34px}
.opts{display:grid;gap:10px}
.opt{background:var(--card2);border:1.5px solid var(--line);border-radius:12px;padding:14px 16px;font-size:15px;text-align:left;transition:.12s}
.opt:hover{border-color:var(--blue)}
.opt.correct{border-color:var(--green);background:rgba(63,191,127,.12)}
.opt.wrong{border-color:var(--red);background:rgba(214,69,90,.12)}
.tokens,.answer-slot{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:14px;min-height:48px}
.answer-slot{background:#0d1322;border:1.5px dashed var(--line);border-radius:12px;padding:12px;align-content:flex-start}
.token{background:var(--card2);border:1px solid var(--line);border-radius:9px;padding:9px 14px;font-size:15px;font-weight:600}
.token:hover{border-color:var(--blue)}
.txt-in{width:100%;padding:14px 16px;background:#0d1322;border:1.5px solid var(--line);border-radius:12px;color:var(--txt);font-size:17px}
.txt-in:focus{outline:none;border-color:var(--blue)}
.feedback{margin-top:16px;padding:14px 16px;border-radius:12px;font-size:14.5px;display:none}
.feedback.ok{display:block;background:rgba(63,191,127,.12);border:1px solid var(--green)}
.feedback.no{display:block;background:rgba(214,69,90,.12);border:1px solid var(--red)}

/* 場景卡 */
.scene-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(180px,1fr));gap:14px}
.scene-card{background:var(--card2);border:1px solid var(--line);border-radius:14px;padding:18px;cursor:pointer;transition:.15s;text-align:center}
.scene-card:hover{transform:translateY(-3px);border-color:var(--blue)}
.scene-card .em{font-size:34px}
.scene-card .nm{font-weight:700;margin-top:6px}
.scene-card .ct{color:var(--muted);font-size:12.5px}

.phrase-list{display:flex;flex-direction:column;gap:10px}
.phrase{display:flex;align-items:center;gap:14px;background:var(--card2);border:1px solid var(--line);border-radius:12px;padding:13px 16px}
.phrase .cz{font-weight:700;font-size:16px}
.phrase .zh{color:var(--muted);font-size:13px}
.phrase .play{margin-left:auto;background:var(--blue);width:38px;height:38px;border-radius:50%;display:grid;place-items:center;font-size:16px;flex:none}

.result-big{text-align:center;padding:20px}
.result-big .score{font-size:64px;font-weight:800;color:var(--gold)}
.review-stat{display:flex;justify-content:space-around;text-align:center;margin:18px 0}
.review-stat b{font-size:26px;display:block}
.review-stat span{color:var(--muted);font-size:13px}

.toast{position:fixed;bottom:24px;left:50%;transform:translateX(-50%) translateY(20px);background:var(--card2);
  border:1px solid var(--gold);color:var(--txt);padding:12px 20px;border-radius:12px;box-shadow:var(--shadow);
  opacity:0;pointer-events:none;transition:.3s;z-index:50;font-weight:600}
.toast.show{opacity:1;transform:translateX(-50%) translateY(0)}

/* 手機：側邊欄收到上方 */
@media(max-width:820px){
  .app{grid-template-columns:1fr}
  .sidebar{position:static;height:auto;flex-direction:column}
  .main{padding:20px 16px 50px}
  .sentence{font-size:24px}
}