/* ============================================================
   精益知识口袋书 · 全册测试题库
   ============================================================ */
:root{
  --bg:#f4f6fb;
  --surface:#ffffff;
  --surface-2:#f8fafc;
  --text:#16203a;
  --text-2:#475569;
  --muted:#7c8798;
  --border:#e4e9f2;
  --border-2:#eef2f8;
  --primary:#2563eb;
  --primary-dark:#1d4ed8;
  --primary-soft:#eaf1ff;
  --ok:#15a34a;
  --ok-soft:#e8f7ee;
  --bad:#dc2626;
  --bad-soft:#fdecec;
  --warn:#d97706;
  --warn-soft:#fdf3e3;
  --radius:14px;
  --radius-sm:9px;
  --shadow:0 1px 2px rgba(16,32,64,.04), 0 8px 24px -12px rgba(16,32,64,.18);
  --shadow-sm:0 1px 2px rgba(16,32,64,.05);
  --font:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei","Source Han Sans SC",sans-serif;
}
*{box-sizing:border-box;}
html,body{margin:0;padding:0;}
html{-webkit-text-size-adjust:100%;}
body{
  background:var(--bg);
  color:var(--text);
  font-family:var(--font);
  font-size:15px;
  line-height:1.65;
  -webkit-font-smoothing:antialiased;
  overscroll-behavior-y:none;
}
.hidden{display:none !important;}
em{font-style:normal;}

/* ---------- 触屏适配基础 ---------- */
button,.btn,.chip,.opt,.sheet-cell,.nav-btn,.modal-actions .btn{
  -webkit-tap-highlight-color:transparent;
  touch-action:manipulation;          /* 取消双击缩放，保留滚动与捏合 */
}
.btn:active,.chip:active,.nav-btn:active{background:#f1f5fd;}
.opt:active:not(.is-locked){background:#f6f9ff;border-color:#b9cbee;}
.sheet-cell:active{transform:scale(.94);}
body.sheet-open{overflow:hidden;}

/* ---------- 答题卡遮罩（移动端底部抽屉用） ---------- */
.sheet-backdrop{
  position:fixed;inset:0;z-index:60;background:rgba(15,23,42,.38);
  animation:fade .18s ease;
}

/* ---------- 顶栏 ---------- */
.topbar{
  position:sticky;top:0;z-index:50;
  background:rgba(255,255,255,.88);
  backdrop-filter:blur(10px);
  border-bottom:1px solid var(--border);
}
.topbar-inner{
  max-width:880px;margin:0 auto;padding:10px 20px;
  display:flex;align-items:center;justify-content:space-between;gap:16px;
}
.brand{display:flex;align-items:center;gap:11px;cursor:pointer;user-select:none;}
.brand-mark{
  width:36px;height:36px;border-radius:10px;flex:none;
  background:linear-gradient(135deg,#2563eb,#4f46e5);
  color:#fff;font-weight:700;font-size:17px;
  display:flex;align-items:center;justify-content:center;
  box-shadow:0 4px 12px -4px rgba(37,99,235,.6);
}
.brand-text{display:flex;flex-direction:column;line-height:1.25;}
.brand-text strong{font-size:15px;letter-spacing:.2px;}
.brand-text > span{font-size:12px;color:var(--muted);}
/* 顶栏窄屏短文案（印尼语下标题与「错题本」较长，小屏改用短名避免换行） */
.narrow-only{display:none;}
.topnav{display:flex;gap:8px;}
.topbar-right{display:flex;align-items:center;gap:10px;}

/* ---------- 语言切换（中 / 中印 / ID） ---------- */
.lang-switch{display:flex;border:1px solid var(--border);border-radius:9px;overflow:hidden;background:#fff;}
.lang-btn{
  border:0;background:transparent;color:var(--text-2);font-size:12.5px;font-weight:600;
  padding:6px 10px;cursor:pointer;line-height:1.4;font-family:inherit;
}
.lang-btn+.lang-btn{border-left:1px solid var(--border);}
.lang-btn.is-active{background:var(--primary);color:#fff;}
.lang-btn:active{background:var(--primary-soft);}
.lang-btn.is-active:active{background:var(--primary-dark);}

/* ---------- 双语文本 ---------- */
.tx{display:block;}
.tx-id{font-size:13px;color:var(--text-2);margin-top:3px;line-height:1.55;}
body[data-lang="cn"] .tx-id{display:none;}
/* 印尼语模式：隐藏中文层；但若该处没有印尼语层（尚未翻译），中文保留作回退 */
body[data-lang="id"] .tx-cn:not(:only-child){display:none;}
body[data-lang="id"] .tx-id{margin-top:0;font-size:inherit;color:inherit;line-height:inherit;}
.tx-inline{display:inline;}
body[data-lang="cn"] .tx-inline.tx-id{display:none;}
body[data-lang="id"] .tx-inline.tx-cn:not(:only-child){display:none;}
.nav-btn{
  border:1px solid var(--border);background:#fff;color:var(--text-2);
  padding:7px 14px;border-radius:9px;font-size:13.5px;cursor:pointer;
  font-family:inherit;transition:.15s;display:flex;align-items:center;gap:6px;
}
.nav-btn:hover{border-color:#c9d6ee;color:var(--primary);}
.nav-btn em{
  background:var(--bad-soft);color:var(--bad);border-radius:20px;
  padding:0 7px;font-size:11.5px;font-weight:600;min-width:18px;text-align:center;
}
.nav-btn em:empty,.nav-btn em[data-zero="1"]{display:none;}

/* ---------- 布局 ---------- */
main{max-width:880px;margin:0 auto;padding:26px 20px 80px;}
.view{animation:fade .25s ease;}
@keyframes fade{from{opacity:0;transform:translateY(6px);}to{opacity:1;transform:none;}}

/* ---------- 首页 Hero ---------- */
/* ---------- 语言入口（首页：中文 / 印尼语分开进入） ---------- */
.lang-pick{
  display:grid;grid-template-columns:1fr 1fr;gap:12px;margin:4px 0 22px;
}
.lang-card{
  display:flex;align-items:center;gap:12px;text-align:left;
  padding:15px 17px;border-radius:14px;cursor:pointer;
  background:var(--surface);border:1.5px solid var(--border);
  font-family:inherit;color:inherit;
  transition:border-color .18s,box-shadow .18s,transform .12s,background .18s;
}
.lang-card:hover{border-color:#c7d2fe;box-shadow:0 6px 18px -10px rgba(37,99,235,.4);}
.lang-card:active{transform:scale(.985);}
.lang-card-mark{
  width:38px;height:38px;border-radius:10px;flex:none;
  display:flex;align-items:center;justify-content:center;
  background:var(--surface-2);color:var(--muted);
  font-weight:700;font-size:15px;letter-spacing:.3px;
  transition:background .18s,color .18s;
}
.lang-card-body{display:flex;flex-direction:column;gap:2px;min-width:0;}
.lang-card-body strong{font-size:15px;line-height:1.3;}
.lang-card-body span{font-size:12.5px;color:var(--muted);line-height:1.4;}
.lang-card.is-active{
  border-color:var(--primary);background:var(--primary-soft);
  box-shadow:0 6px 18px -12px rgba(37,99,235,.55);
}
.lang-card.is-active .lang-card-mark{background:var(--primary);color:#fff;}
.lang-card.is-active .lang-card-body strong{color:var(--primary-dark);}

.hero{text-align:center;padding:14px 0 22px;}
.hero h1{
  margin:0 0 10px;font-size:27px;letter-spacing:-.3px;font-weight:700;
  background:linear-gradient(120deg,#1e293b,#2563eb);
  -webkit-background-clip:text;background-clip:text;color:transparent;
}
.hero p{margin:0;color:var(--muted);font-size:14.5px;}

/* ---------- 统计 ---------- */
.stat-row{
  display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin-bottom:18px;
}
.stat{
  background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);
  padding:15px 12px;text-align:center;box-shadow:var(--shadow-sm);
}
.stat-num{display:block;font-size:23px;font-weight:700;letter-spacing:-.5px;color:var(--text);}
.stat-num.ok{color:var(--ok);}
.stat-num.bad{color:var(--bad);}
.stat-label{display:block;font-size:12px;color:var(--muted);margin-top:3px;}

/* ---------- 卡片 ---------- */
.card{
  background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);
  padding:22px;margin-bottom:18px;box-shadow:var(--shadow-sm);
}
.card-title{margin:0 0 16px;font-size:16px;font-weight:650;letter-spacing:.1px;}
.card-desc{margin:0 0 16px;color:var(--text-2);font-size:13.5px;line-height:1.75;}

/* ---------- 字段 ---------- */
.field{margin-bottom:22px;}
.field-label{display:block;font-size:13.5px;font-weight:600;color:var(--text-2);margin-bottom:10px;}
.chips{display:flex;flex-wrap:wrap;gap:9px;}
.chip{
  border:1.5px solid var(--border);background:#fff;color:var(--text-2);
  padding:8px 16px;border-radius:22px;font-size:13.5px;cursor:pointer;
  font-family:inherit;transition:.15s;
}
.chip:hover{border-color:#bccced;}
.chip.is-active{
  border-color:var(--primary);background:var(--primary-soft);color:var(--primary-dark);font-weight:600;
}
.custom-count{margin-top:12px;display:flex;align-items:center;gap:12px;flex-wrap:wrap;}
.custom-count input{
  width:120px;padding:9px 12px;border:1.5px solid var(--border);border-radius:var(--radius-sm);
  font-family:inherit;font-size:14px;color:var(--text);outline:none;transition:.15s;
}
.custom-count input:focus{border-color:var(--primary);box-shadow:0 0 0 3px rgba(37,99,235,.12);}
.hint{color:var(--muted);font-size:12.5px;}
/* 练习范围下拉 */
.select{
  width:100%;box-sizing:border-box;
  padding:11px 38px 11px 13px;border-radius:10px;
  border:1.5px solid var(--border);background:var(--surface);color:var(--text);
  font-family:inherit;font-size:14.5px;line-height:1.45;
  appearance:none;-webkit-appearance:none;-moz-appearance:none;
  background-image:url("data:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8' fill='none' stroke='%237c8798' stroke-width='1.8' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M1 1.5 6 6.5 11 1.5'/%3E%3C/svg%3E");
  background-repeat:no-repeat;background-position:right 13px center;
  cursor:pointer;transition:border-color .18s,box-shadow .18s;
}
.select:hover{border-color:#c7d2fe;}
.select:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px var(--primary-soft);}
.field .select + .hint{display:block;margin-top:8px;}

.rule-box{
  background:var(--surface-2);border:1px solid var(--border-2);border-radius:var(--radius-sm);
  padding:13px 15px;display:flex;flex-direction:column;gap:4px;
}
.rule-main{font-size:14px;}
.rule-main strong{color:var(--primary-dark);font-size:16px;}

/* ---------- 按钮 ---------- */
.btn{
  border:1px solid var(--border);background:#fff;color:var(--text-2);
  padding:10px 18px;border-radius:var(--radius-sm);font-size:14px;cursor:pointer;
  font-family:inherit;transition:.15s;font-weight:500;
}
.btn:hover{border-color:#c2d2ee;background:#fbfcff;}
.btn:active{transform:translateY(1px);}
.btn:disabled{opacity:.45;cursor:not-allowed;transform:none;}
.btn-primary{background:var(--primary);border-color:var(--primary);color:#fff;}
.btn-primary:hover{background:var(--primary-dark);border-color:var(--primary-dark);}
.btn-warn{background:var(--warn-soft);border-color:#f3ddb5;color:#a35c07;}
.btn-warn:hover{background:#fbeacd;}
.btn-ghost{background:transparent;}
.btn-danger{color:var(--bad);border-color:#f3d0d0;}
.btn-danger:hover{background:var(--bad-soft);border-color:#eeb4b4;}
.btn-lg{padding:14px 22px;font-size:15.5px;font-weight:600;border-radius:11px;}
.btn-sm{padding:7px 14px;font-size:13px;}
.btn-block{width:100%;}
.btn-row{display:flex;gap:10px;flex-wrap:wrap;}
.btn-row.center{justify-content:center;}

/* ---------- 续答提示 ---------- */
.resume{
  background:linear-gradient(100deg,#eef4ff,#f3f0ff);
  border:1px solid #d6e2fb;border-radius:var(--radius);
  padding:15px 18px;margin-bottom:18px;
  display:flex;align-items:center;justify-content:space-between;gap:14px;flex-wrap:wrap;
}
.resume strong{display:block;font-size:14px;}
.resume span{font-size:12.5px;color:var(--text-2);}
.resume-actions{display:flex;gap:9px;}

/* ---------- 答题页 ---------- */
.quiz-top{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:14px;}
.timer{
  display:flex;align-items:center;gap:7px;
  background:var(--surface);border:1px solid var(--border);border-radius:22px;
  padding:7px 17px;font-variant-numeric:tabular-nums;
  font-size:16px;font-weight:650;letter-spacing:.5px;color:var(--text);
  box-shadow:var(--shadow-sm);transition:.2s;
}
.timer-icon{width:15px;height:15px;flex:none;}
.timer.is-warn{border-color:#f3ddb5;background:var(--warn-soft);color:#a35c07;}
.timer.is-danger{
  border-color:#eeb4b4;background:var(--bad-soft);color:var(--bad);
  animation:pulse 1s infinite;
}
@keyframes pulse{0%,100%{opacity:1;}50%{opacity:.62;}}

.progress-wrap{margin-bottom:18px;}
.progress-bar{height:7px;background:#e6ebf4;border-radius:20px;overflow:hidden;}
.progress-bar i{
  display:block;height:100%;width:0;border-radius:20px;
  background:linear-gradient(90deg,#2563eb,#4f46e5);transition:width .3s ease;
}
.progress-text{display:flex;justify-content:space-between;font-size:12.5px;color:var(--muted);margin-top:7px;}

/* ---------- 答题卡 ---------- */
.sheet{
  background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);
  padding:16px 18px;margin-bottom:16px;box-shadow:var(--shadow-sm);
}
.sheet-head{display:flex;justify-content:space-between;align-items:baseline;margin-bottom:12px;}
.sheet-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(40px,1fr));gap:8px;}
.sheet-cell{
  aspect-ratio:1;border-radius:8px;border:1.5px solid var(--border);background:#fff;
  color:var(--text-2);font-size:13px;font-weight:600;cursor:pointer;font-family:inherit;
  display:flex;align-items:center;justify-content:center;transition:.13s;padding:0;
}
.sheet-cell:hover{border-color:#b9cbee;}
.sheet-cell.is-ok{background:var(--ok-soft);border-color:#b7e2c7;color:#0f7a38;}
.sheet-cell.is-bad{background:var(--bad-soft);border-color:#f0bcbc;color:var(--bad);}
.sheet-cell.is-cur{outline:2.5px solid var(--primary);outline-offset:1px;}
.sheet-legend{display:flex;gap:16px;margin-top:14px;font-size:12px;color:var(--muted);flex-wrap:wrap;}
.sheet-legend span{display:flex;align-items:center;gap:6px;}
.dot{width:11px;height:11px;border-radius:3px;display:inline-block;border:1.5px solid var(--border);}
.dot-cur{border-color:var(--primary);background:#fff;}
.dot-ok{background:var(--ok-soft);border-color:#b7e2c7;}
.dot-bad{background:var(--bad-soft);border-color:#f0bcbc;}
.dot-todo{background:#fff;}

/* ---------- 题目 ---------- */
.q-card{padding:24px;}
.q-meta{display:flex;align-items:center;gap:9px;margin-bottom:14px;flex-wrap:wrap;}
.q-no{font-size:13px;font-weight:650;color:var(--primary-dark);}
.tag{
  font-size:11.5px;padding:2.5px 10px;border-radius:20px;font-weight:600;
  background:var(--primary-soft);color:var(--primary-dark);
}
.tag-ghost{background:var(--surface-2);color:var(--muted);border:1px solid var(--border-2);}
.tag-ok{background:var(--ok-soft);color:#0f7a38;}
.tag-bad{background:var(--bad-soft);color:var(--bad);}

.q-stem{font-size:17px;line-height:1.75;font-weight:550;letter-spacing:.15px;margin-bottom:20px;}
.q-options{display:flex;flex-direction:column;gap:10px;}
.opt{
  display:flex;align-items:flex-start;gap:12px;width:100%;text-align:left;
  background:#fff;border:1.5px solid var(--border);border-radius:11px;
  padding:13px 15px;cursor:pointer;font-family:inherit;font-size:15px;color:var(--text);
  line-height:1.6;transition:.14s;
}
.opt:hover:not(.is-locked){border-color:#b9cbee;background:#fbfcff;}
.opt-key{
  flex:none;width:25px;height:25px;border-radius:7px;background:var(--surface-2);
  border:1px solid var(--border);color:var(--text-2);
  display:flex;align-items:center;justify-content:center;font-size:13px;font-weight:700;transition:.14s;
}
.opt.is-picked{border-color:var(--primary);background:var(--primary-soft);}
.opt.is-picked .opt-key{background:var(--primary);border-color:var(--primary);color:#fff;}
.opt.is-correct{border-color:#8fd3a8;background:var(--ok-soft);}
.opt.is-correct .opt-key{background:var(--ok);border-color:var(--ok);color:#fff;}
.opt.is-wrong{border-color:#efa9a9;background:var(--bad-soft);}
.opt.is-wrong .opt-key{background:var(--bad);border-color:var(--bad);color:#fff;}
.opt.is-locked{cursor:default;}
.opt-text{flex:1;}

/* ---------- 多选题 ---------- */
.opt-check{
  flex:none;width:19px;height:19px;border:2px solid var(--border);border-radius:6px;
  position:relative;transition:background .12s,border-color .12s;
}
.opt.is-picked .opt-check,.opt.is-correct .opt-check{background:var(--primary);border-color:var(--primary);}
.opt.is-correct .opt-check{background:var(--ok);border-color:var(--ok);}
.opt.is-wrong .opt-check{background:var(--bad);border-color:var(--bad);}
.opt.is-picked .opt-check::after,.opt.is-correct .opt-check::after,.opt.is-wrong .opt-check::after{
  content:"";position:absolute;left:5.5px;top:1.5px;width:4px;height:9px;
  border:solid #fff;border-width:0 2px 2px 0;transform:rotate(45deg);
}
/* 多选题漏选：正确但未勾选，用琥珀色区分于「已选对」的绿色 */
.opt.is-missed{border-color:#f0c47a;background:var(--warn-soft);}
.opt.is-missed .opt-key{background:var(--warn);border-color:var(--warn);color:#fff;}
.opt.is-missed .opt-check{background:var(--warn);border-color:var(--warn);}
.opt.is-missed .opt-check::after{content:none;}
.multi-submit{
  display:flex;align-items:center;justify-content:space-between;gap:12px;
  margin-top:14px;padding:12px 14px;border:1px dashed var(--border);border-radius:var(--radius-sm);
  background:var(--surface-2);
}
.multi-hint{font-size:12.5px;color:var(--muted);}
.multi-submit .btn{flex:none;}
.multi-submit .btn:disabled{opacity:.5;cursor:not-allowed;}

.q-feedback{
  margin-top:18px;border-radius:var(--radius-sm);padding:14px 16px;
  border:1px solid var(--border);background:var(--surface-2);
  animation:fade .2s ease;
}
.q-feedback.fb-ok{background:var(--ok-soft);border-color:#b7e2c7;}
.q-feedback.fb-bad{background:var(--bad-soft);border-color:#f0bcbc;}
.fb-head{display:flex;align-items:center;gap:9px;font-weight:650;font-size:14.5px;margin-bottom:6px;}
.fb-ok .fb-head{color:#0f7a38;}
.fb-bad .fb-head{color:var(--bad);}
.fb-body{font-size:13.5px;color:var(--text-2);line-height:1.75;}
.fb-body b{color:var(--text);}
.fb-src{margin-top:8px;font-size:12.5px;color:var(--muted);display:flex;gap:6px;align-items:flex-start;}
.fb-src .ico,.review-src .ico{flex:none;margin-top:3px;opacity:.6;}

/* ---------- 分析 · 原文引用 ---------- */
.fb-quote{
  margin-top:12px;padding-top:12px;border-top:1px dashed var(--border);
}
.fb-quote-title{
  font-size:12.5px;font-weight:650;color:var(--primary-dark);
  letter-spacing:.3px;margin-bottom:8px;display:flex;align-items:center;gap:6px;
}
.fb-quote-title::before{
  content:"";width:3px;height:12px;border-radius:2px;background:var(--primary);flex:none;
}
.fb-quote-note{
  font-size:11.5px;color:var(--muted);margin:-3px 0 8px;
}
/* 纯中文模式不显示「印尼语为参考译文」的说明 */
body[data-lang="cn"] .fb-quote-note{display:none;}
.fb-quote ul{margin:0;padding:0;list-style:none;display:flex;flex-direction:column;gap:8px;}
.fb-quote li{
  font-size:13px;line-height:1.75;color:var(--text-2);
  background:#fff;border:1px solid var(--border-2);border-left:3px solid var(--primary-soft);
  border-radius:0 8px 8px 0;padding:8px 12px;
}
/* 引号按语言各自包裹：中文用「」，印尼语用 “ ” */
.fb-quote .q-text .tx-cn::before{content:"「";color:var(--muted);}
.fb-quote .q-text .tx-cn::after{content:"」";color:var(--muted);}
.fb-quote .q-text .tx-id::before{content:"“";color:var(--muted);}
.fb-quote .q-text .tx-id::after{content:"”";color:var(--muted);}
.fb-quote .q-loc{
  display:block;margin-top:5px;font-size:12px;color:var(--muted);
}
.review-item .fb-quote{margin-top:10px;padding-top:10px;}
.review-item .fb-quote li{background:var(--surface);}

.quiz-nav{display:grid;grid-template-columns:1fr 1fr 1fr;gap:10px;margin-top:6px;}

/* ---------- 结果页 ---------- */
.result-hero{
  background:linear-gradient(120deg,#1d4ed8,#4f46e5);
  border-radius:var(--radius);padding:28px 26px;margin-bottom:18px;color:#fff;
  display:flex;align-items:center;gap:24px;flex-wrap:wrap;
  box-shadow:0 16px 36px -18px rgba(37,99,235,.75);
}
.score-ring{
  width:118px;height:118px;border-radius:50%;flex:none;
  background:rgba(255,255,255,.14);border:3px solid rgba(255,255,255,.55);
  display:flex;flex-direction:column;align-items:center;justify-content:center;
}
.score-num{font-size:38px;font-weight:750;line-height:1;letter-spacing:-1px;}
.score-unit{font-size:12.5px;opacity:.85;margin-top:4px;}
.result-meta h2{margin:0 0 6px;font-size:21px;font-weight:650;}
.result-meta p{margin:0;font-size:13.5px;opacity:.9;line-height:1.7;}

.count-em{
  background:var(--bad-soft);color:var(--bad);border-radius:20px;
  padding:1px 9px;font-size:12px;font-weight:650;vertical-align:2px;
}

/* ---------- 错题/回顾列表 ---------- */
.review-list{display:flex;flex-direction:column;gap:12px;}
.review-item{
  border:1px solid var(--border);border-radius:var(--radius-sm);
  padding:15px 17px;background:var(--surface-2);
}
.review-stem{font-size:14.5px;line-height:1.7;margin-bottom:10px;font-weight:550;}
.review-rows{display:flex;flex-direction:column;gap:5px;font-size:13px;color:var(--text-2);}
.review-rows .rv{display:flex;gap:8px;}
.review-rows .rv b{font-weight:600;}
.rv-bad{color:var(--bad);}
.rv-ok{color:#0f7a38;}
.review-src{margin-top:8px;font-size:12.5px;color:var(--muted);display:flex;gap:6px;align-items:flex-start;}
.review-actions{margin-top:10px;display:flex;gap:8px;}
.empty{
  text-align:center;padding:36px 20px;color:var(--muted);font-size:14px;
  background:var(--surface-2);border:1px dashed var(--border);border-radius:var(--radius-sm);
}

.view-head{margin-bottom:16px;}
.view-head h2{margin:0 0 6px;font-size:20px;font-weight:650;}

/* ---------- 导入日志 ---------- */
.import-log{
  margin-top:16px;border:1px solid var(--border);border-radius:var(--radius-sm);
  padding:13px 16px;background:var(--surface-2);font-size:13px;color:var(--text-2);
  line-height:1.8;max-height:240px;overflow:auto;
}
.import-log b{color:var(--text);}
.log-ok{color:#0f7a38;font-weight:600;}
.log-bad{color:var(--bad);font-weight:600;}

/* ---------- Toast ---------- */
.toast{
  position:fixed;left:50%;bottom:34px;transform:translateX(-50%);
  background:#1e293b;color:#fff;padding:11px 22px;border-radius:11px;
  font-size:14px;z-index:200;box-shadow:0 12px 30px -10px rgba(0,0,0,.45);
  animation:toastIn .22s ease;max-width:88vw;text-align:center;
}
@keyframes toastIn{from{opacity:0;transform:translate(-50%,12px);}to{opacity:1;transform:translate(-50%,0);}}

/* ---------- Modal ---------- */
.modal{
  position:fixed;inset:0;background:rgba(15,23,42,.42);z-index:150;
  display:flex;align-items:center;justify-content:center;padding:20px;
  backdrop-filter:blur(2px);
}
.modal-box{
  background:#fff;border-radius:var(--radius);padding:24px;max-width:400px;width:100%;
  box-shadow:0 24px 60px -20px rgba(0,0,0,.4);animation:fade .2s ease;
}
.modal-box h3{margin:0 0 10px;font-size:17px;}
.modal-box p{margin:0 0 20px;color:var(--text-2);font-size:14px;line-height:1.7;}
.modal-actions{display:flex;justify-content:flex-end;gap:10px;}

/* ---------- 响应式 ---------- */
/* ---------- 响应式：手机端（≤640px） ---------- */
@media (max-width:640px){
  main{padding:16px 13px calc(150px + env(safe-area-inset-bottom));}
  .hero{padding:6px 0 16px;}
  .hero h1{font-size:21px;}
  .hero p{font-size:13.5px;}

  /* 语言入口：小屏保持两列，压缩留白 */
  .lang-pick{gap:9px;margin:2px 0 16px;}
  .lang-card{padding:12px 13px;gap:10px;border-radius:12px;min-height:56px;}
  .lang-card-mark{width:32px;height:32px;border-radius:9px;font-size:13px;}
  .lang-card-body strong{font-size:14px;}
  .lang-card-body span{font-size:11.5px;}
  .stat-row{grid-template-columns:repeat(2,1fr);gap:10px;}
  .stat{padding:13px 10px;}
  .stat-num{font-size:21px;}
  .card{padding:16px;margin-bottom:14px;}
  .card-title{font-size:15px;margin-bottom:13px;}
  .q-card{padding:16px;}
  .q-stem{font-size:17px;line-height:1.7;}
  .q-meta{margin-bottom:11px;}

  /* 触控目标 ≥ 44px */
  .opt{min-height:56px;padding:14px;font-size:15.5px;}
  .btn{padding:11px 16px;min-height:44px;}
  .btn-sm{min-height:40px;}
  .chip{padding:9px 15px;min-height:40px;}
  .nav-btn{min-height:40px;}

  /* 顶栏：答题中隐藏导航，避免误触离开 */
  .wide-only{display:none;}
  .narrow-only{display:inline;}
  .brand-text > span{display:none;}
  .topbar-inner{padding:9px 13px;}
  .in-quiz .topnav{display:none;}
  .in-quiz .brand-text strong{font-size:14px;}

  .quiz-top{margin-bottom:12px;}
  .timer{padding:8px 16px;font-size:15.5px;}
  .progress-wrap{margin-bottom:14px;}

  /* 底部固定操作条 */
  .quiz-nav{
    position:fixed;left:0;right:0;bottom:0;z-index:55;
    display:grid;grid-template-columns:1fr 1.25fr .95fr;
    gap:8px;margin:0;
    padding:10px 13px calc(10px + env(safe-area-inset-bottom));
    background:rgba(255,255,255,.97);
    backdrop-filter:blur(12px);
    border-top:1px solid var(--border);
    box-shadow:0 -8px 28px -18px rgba(16,32,64,.5);
  }
  #submitBtn{grid-column:auto;}

  /* 答题卡改为底部抽屉 */
  .sheet{
    position:fixed;left:0;right:0;bottom:0;z-index:70;
    margin:0;max-height:72vh;overflow:auto;
    border-radius:18px 18px 0 0;border-bottom:0;
    padding:16px 16px calc(16px + env(safe-area-inset-bottom));
    box-shadow:0 -14px 44px -16px rgba(16,32,64,.4);
    animation:drawerUp .22s cubic-bezier(.22,.8,.3,1);
  }
  .sheet-grid{grid-template-columns:repeat(auto-fill,minmax(44px,1fr));gap:8px;}
  .sheet-cell{min-height:44px;font-size:14px;}

  .result-hero{padding:20px;gap:16px;flex-direction:column;align-items:flex-start;}
  .score-ring{width:88px;height:88px;}
  .score-num{font-size:29px;}
  .result-meta h2{font-size:19px;}
  .review-item{padding:13px 14px;}
  .btn-row .btn{flex:1 1 auto;}

  .q-feedback{padding:13px 14px;}
  .fb-quote li{padding:9px 11px;font-size:13.5px;}

  /* 避免 iOS 聚焦输入框时自动放大 */
  input,select,textarea{font-size:16px;}
  .custom-count input{width:100%;}

  .toast{bottom:calc(96px + env(safe-area-inset-bottom));}
  .modal{padding:16px;align-items:flex-end;}
  .modal-box{border-radius:16px;padding:20px;}
}
@keyframes drawerUp{from{transform:translateY(100%);}to{transform:translateY(0);}}

/* 横屏 / 矮屏设备 */
@media (max-height:520px) and (orientation:landscape){
  .sheet{max-height:86vh;}
  .quiz-nav{padding-top:7px;padding-bottom:calc(7px + env(safe-area-inset-bottom));}
  .result-hero{flex-direction:row;align-items:center;}
}