:root{
  --navy:#142850;
  --navy-dim:#1c3563;
  --red:#d21f1f;
  --yellow:#f5c518;
  --blue:#1a63c9;
  --green:#1f9d55;
  --bg:#f4f6fa;
  --card:#ffffff;
  --text:#16233d;
  --text-dim:#5b6a86;
  --border:#e1e6ef;
  --shadow:0 2px 10px rgba(20,40,80,.08);
  --radius:14px;
  --safe-top:env(safe-area-inset-top,0px);
  --safe-bottom:env(safe-area-inset-bottom,0px);
}
@media (prefers-color-scheme: dark){
  :root{
    --bg:#0c1526;
    --card:#131f36;
    --text:#eef2fa;
    --text-dim:#8a97b3;
    --border:#22314f;
    --shadow:0 2px 12px rgba(0,0,0,.35);
    --navy:#0f1d3a;
    --navy-dim:#16274a;
  }
}

*{box-sizing:border-box;}
html,body{margin:0;padding:0;height:100%;}
body{
  font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,Arial,sans-serif;
  background:var(--bg);
  color:var(--text);
  overscroll-behavior-y:none;
  -webkit-tap-highlight-color:transparent;
}
button{font-family:inherit;color:inherit;}
.app{display:flex;flex-direction:column;min-height:100vh;}

.topbar{
  background:linear-gradient(135deg,var(--navy),var(--navy-dim));
  color:#fff;
  padding:calc(10px + var(--safe-top)) 18px 12px;
  display:flex;align-items:baseline;gap:10px;
  position:sticky;top:0;z-index:20;
  box-shadow:0 2px 10px rgba(0,0,0,.15);
}
.topbar-brand{font-size:17px;font-weight:800;letter-spacing:.01em;display:flex;align-items:center;gap:8px;}
.topbar-logo{font-size:19px;}
.topbar-sub{font-size:12px;font-weight:700;color:var(--yellow);background:rgba(245,197,24,.15);padding:2px 8px;border-radius:999px;margin-left:auto;}

.view{flex:1;padding:14px 14px calc(90px + var(--safe-bottom));max-width:640px;margin:0 auto;width:100%;}

.bottombar{
  position:fixed;left:0;right:0;bottom:0;z-index:30;
  display:flex;background:var(--card);border-top:1px solid var(--border);
  padding-bottom:var(--safe-bottom);
  box-shadow:0 -2px 12px rgba(0,0,0,.06);
}
.bb-btn{
  flex:1;background:none;border:none;display:flex;flex-direction:column;align-items:center;gap:2px;
  padding:9px 2px 8px;color:var(--text-dim);cursor:pointer;
}
.bb-icon{font-size:19px;line-height:1;}
.bb-label{font-size:10px;font-weight:700;}
.bb-btn.active{color:var(--blue);}
.bb-btn.active .bb-icon{transform:translateY(-1px);}

.card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);}
.section-title{font-size:13px;font-weight:800;letter-spacing:.04em;text-transform:uppercase;color:var(--text-dim);margin:22px 2px 10px;}
.section-title:first-child{margin-top:2px;}
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  border:none;border-radius:11px;padding:13px 18px;font-size:15px;font-weight:700;
  cursor:pointer;background:var(--blue);color:#fff;width:100%;
}
.btn.secondary{background:var(--card);color:var(--text);border:1px solid var(--border);}
.btn.ghost{background:transparent;color:var(--blue);}
.btn:active{transform:scale(.98);}
.btn:disabled{opacity:.5;}
.pill{display:inline-block;font-size:11px;font-weight:700;padding:3px 9px;border-radius:999px;background:rgba(26,99,201,.12);color:var(--blue);}

.hero{background:linear-gradient(135deg,var(--navy),var(--navy-dim));color:#fff;border-radius:18px;padding:20px;margin-bottom:16px;}
.hero h1{font-size:19px;margin:0 0 6px;}
.hero p{margin:0;font-size:13.5px;color:#c6d2ec;line-height:1.5;}
.stat-row{display:grid;grid-template-columns:1fr 1fr 1fr;gap:10px;margin-bottom:16px;}
.stat-box{background:var(--card);border:1px solid var(--border);border-radius:12px;padding:12px 8px;text-align:center;}
.stat-num{font-size:20px;font-weight:800;color:var(--blue);}
.stat-lbl{font-size:10.5px;color:var(--text-dim);font-weight:700;margin-top:2px;}
.quick-grid{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-bottom:6px;}
.quick-card{
  background:var(--card);border:1px solid var(--border);border-radius:13px;padding:14px 12px;
  cursor:pointer;text-align:left;
}
.quick-card .qc-icon{font-size:22px;}
.quick-card .qc-title{font-weight:800;font-size:13.5px;margin-top:6px;}
.quick-card .qc-sub{font-size:11.5px;color:var(--text-dim);margin-top:2px;}
.disclaimer{
  background:rgba(245,197,24,.12);border:1px solid rgba(245,197,24,.4);border-radius:12px;
  padding:12px 14px;font-size:12px;line-height:1.55;color:var(--text-dim);margin-top:18px;
}
.disclaimer b{color:var(--text);}

.chapter-list{display:flex;flex-direction:column;gap:10px;}
.chapter-card{display:flex;align-items:center;gap:12px;padding:14px;cursor:pointer;}
.chapter-icon{font-size:24px;width:38px;text-align:center;flex-shrink:0;}
.chapter-name{font-weight:700;font-size:14.5px;}
.chapter-count{font-size:11.5px;color:var(--text-dim);margin-top:2px;}
.chapter-arrow{margin-left:auto;color:var(--text-dim);font-size:18px;}
.back-btn{display:flex;align-items:center;gap:6px;background:none;border:none;color:var(--blue);font-weight:700;font-size:14px;padding:6px 2px 14px;cursor:pointer;}
.chapter-detail-title{display:flex;align-items:center;gap:10px;font-size:19px;font-weight:800;margin-bottom:14px;}
.point-list{display:flex;flex-direction:column;gap:10px;}
.point-item{display:flex;gap:10px;padding:12px 14px;}
.point-dot{width:7px;height:7px;border-radius:50%;background:var(--blue);margin-top:6px;flex-shrink:0;}
.point-text{font-size:14px;line-height:1.55;}

.cat-chips{display:flex;gap:8px;overflow-x:auto;padding-bottom:4px;margin-bottom:14px;-webkit-overflow-scrolling:touch;}
.cat-chip{
  flex-shrink:0;padding:8px 14px;border-radius:999px;font-size:12.5px;font-weight:700;
  border:1px solid var(--border);background:var(--card);color:var(--text-dim);cursor:pointer;white-space:nowrap;
}
.cat-chip.active{background:var(--blue);border-color:var(--blue);color:#fff;}
.sign-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;}
.sign-card{padding:10px 6px 8px;text-align:center;cursor:pointer;}
.sign-card img{width:100%;max-width:64px;aspect-ratio:1;margin:0 auto;display:block;object-fit:contain;}
.sign-card .sign-name{font-size:10.5px;font-weight:700;margin-top:6px;line-height:1.3;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;}
.cat-desc{font-size:12px;color:var(--text-dim);margin:-6px 2px 14px;line-height:1.5;}

.modal-overlay{
  position:fixed;inset:0;background:rgba(8,14,28,.55);z-index:100;
  display:flex;align-items:flex-end;justify-content:center;
}
.modal-sheet{
  background:var(--card);border-radius:20px 20px 0 0;padding:22px 20px calc(24px + var(--safe-bottom));
  width:100%;max-width:640px;max-height:82vh;overflow-y:auto;
}
.modal-sheet img{width:130px;height:130px;display:block;margin:0 auto 14px;object-fit:contain;}
.modal-title{font-size:17px;font-weight:800;text-align:center;margin-bottom:8px;}
.modal-cat{display:block;text-align:center;margin-bottom:10px;}
.modal-desc{font-size:14px;line-height:1.6;color:var(--text-dim);text-align:center;}
.modal-close{position:absolute;top:16px;right:16px;background:var(--bg);border:none;width:32px;height:32px;border-radius:50%;font-size:16px;cursor:pointer;color:var(--text-dim);}
.modal-sheet{position:relative;}

.mode-grid{display:flex;flex-direction:column;gap:10px;margin-bottom:8px;}
.mode-card{display:flex;align-items:center;gap:12px;padding:13px 14px;cursor:pointer;}
.mode-card .mc-icon{font-size:20px;width:32px;text-align:center;}
.mode-card .mc-name{font-weight:700;font-size:13.5px;}
.mode-card .mc-sub{font-size:11px;color:var(--text-dim);}
.mode-card.selected{border-color:var(--blue);box-shadow:0 0 0 2px var(--blue) inset;}

.qz-progress-wrap{display:flex;align-items:center;gap:10px;margin-bottom:16px;}
.qz-bar-track{flex:1;height:7px;border-radius:999px;background:var(--border);overflow:hidden;}
.qz-bar-fill{height:100%;background:var(--blue);border-radius:999px;transition:width .25s;}
.qz-count{font-size:12px;font-weight:700;color:var(--text-dim);white-space:nowrap;}
.qz-timer{font-size:12px;font-weight:800;color:var(--red);white-space:nowrap;}
.qz-cat-pill{margin-bottom:10px;}
.qz-question{font-size:16.5px;font-weight:700;line-height:1.45;margin-bottom:16px;}
.qz-options{display:flex;flex-direction:column;gap:10px;}
.qz-opt{
  text-align:left;padding:13px 14px;border-radius:12px;border:1.5px solid var(--border);
  background:var(--card);font-size:14px;line-height:1.4;cursor:pointer;color:var(--text);
  display:flex;align-items:flex-start;gap:10px;
}
.qz-opt-letter{
  flex-shrink:0;width:24px;height:24px;border-radius:50%;background:var(--bg);border:1.5px solid var(--border);
  display:flex;align-items:center;justify-content:center;font-size:12px;font-weight:800;color:var(--text-dim);
}
.qz-opt-text{flex:1;}
.qz-opt:active{transform:scale(.99);}
.qz-opt.selected{border-color:var(--blue);background:rgba(26,99,201,.1);}
.qz-opt.selected .qz-opt-letter{background:var(--blue);border-color:var(--blue);color:#fff;}
.qz-opt.correct{border-color:var(--green);background:rgba(31,157,85,.12);}
.qz-opt.correct .qz-opt-letter{background:var(--green);border-color:var(--green);color:#fff;}
.qz-opt.wrong{border-color:var(--red);background:rgba(210,31,31,.12);}
.qz-opt.wrong .qz-opt-letter{background:var(--red);border-color:var(--red);color:#fff;}
.qz-opt.disabled{pointer-events:none;}
.qz-opt.dim{opacity:.55;}
.qz-explanation{margin-top:14px;padding:13px 14px;border-radius:12px;background:var(--bg);font-size:13px;line-height:1.55;color:var(--text-dim);}
.qz-explanation b{color:var(--text);}
.qz-nextbar{margin-top:18px;}
.qz-multi-hint{font-size:12px;font-weight:700;color:var(--blue);background:rgba(26,99,201,.1);border-radius:8px;padding:8px 12px;margin-bottom:12px;}
.qz-result{text-align:center;padding:30px 16px;}
.qz-result-score{font-size:42px;font-weight:800;color:var(--blue);margin-bottom:4px;}
.qz-result-label{font-size:13px;color:var(--text-dim);font-weight:700;margin-bottom:22px;}
.qz-result-actions{display:flex;flex-direction:column;gap:10px;}
.qz-missed{margin-top:20px;text-align:left;}
.qz-missed-item{padding:12px 14px;margin-bottom:8px;}
.qz-missed-q{font-weight:700;font-size:13px;margin-bottom:6px;}
.qz-missed-a{font-size:12.5px;color:var(--text-dim);line-height:1.5;}
.qz-missed-a b{color:var(--green);}

.empty-state{text-align:center;padding:40px 20px;color:var(--text-dim);}
.empty-state .es-icon{font-size:34px;margin-bottom:10px;}