:root{
  --bg:#f4f5f7; --card:#fff; --fg:#14161a; --sub:#6b7280; --line:#e3e6ea;
  --brand:#1b6ef3; --ok:#12a150; --no:#e5484d; --warn:#f5a524;
  --shadow:0 1px 2px rgba(0,0,0,.06),0 4px 14px rgba(0,0,0,.05);
  --tab:64px;
}
@media (prefers-color-scheme:dark){
  :root{--bg:#0e1013;--card:#181b20;--fg:#f0f2f5;--sub:#9aa3af;--line:#2a2f37;
        --shadow:0 1px 2px rgba(0,0,0,.4),0 4px 14px rgba(0,0,0,.3);}
}
*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--fg);overscroll-behavior-y:none;
  font-family:-apple-system,BlinkMacSystemFont,"Apple SD Gothic Neo","Noto Sans KR",system-ui,sans-serif}

/* 상단바 */
#bar{position:sticky;top:0;z-index:20;display:flex;align-items:center;gap:8px;
  padding:12px 14px;padding-top:calc(12px + env(safe-area-inset-top));
  background:var(--card);border-bottom:1px solid var(--line)}
#bar h1{font-size:16px;margin:0;flex:1;font-weight:700;letter-spacing:-.2px}
#back{background:none;border:0;font-size:24px;line-height:1;color:var(--fg);
  cursor:pointer;padding:4px 8px;margin-left:-8px;min-width:40px}
#badge{font-size:13px;color:var(--sub);font-variant-numeric:tabular-nums;white-space:nowrap}

main{max-width:620px;margin:0 auto;padding:14px 14px calc(var(--tab) + 24px + env(safe-area-inset-bottom))}

/* 하단 탭 — 엄지로 닿는 위치 */
#tabs{position:fixed;left:0;right:0;bottom:0;z-index:20;display:flex;
  background:var(--card);border-top:1px solid var(--line);
  padding-bottom:env(safe-area-inset-bottom)}
#tabs button{flex:1;border:0;background:none;color:var(--sub);cursor:pointer;
  padding:9px 0 8px;font-size:11px;font-family:inherit;display:flex;
  flex-direction:column;align-items:center;gap:3px;min-height:var(--tab)}
#tabs button i{font-style:normal;font-size:21px;line-height:1}
#tabs button.on{color:var(--brand);font-weight:700}
body.quiz #tabs{display:none}          /* 시험 중에는 탭을 숨겨 집중시킨다 */
body.quiz main{padding-bottom:24px}

.card{background:var(--card);border-radius:14px;padding:15px;box-shadow:var(--shadow);margin-bottom:11px}
.btn{display:block;width:100%;padding:16px;border-radius:13px;border:0;background:var(--brand);
  color:#fff;font-size:16px;font-weight:700;cursor:pointer;font-family:inherit;min-height:54px}
.btn:disabled{opacity:.4}
.btn.ghost{background:transparent;color:var(--brand);box-shadow:inset 0 0 0 1.5px var(--brand)}
.btn.gray{background:var(--line);color:var(--fg)}
.btn.sm{padding:11px;font-size:14px;min-height:44px}
.btn+.btn{margin-top:9px}
.row{display:flex;gap:9px}.row>*{flex:1;margin-top:0!important}
.muted{color:var(--sub);font-size:13px;line-height:1.5}
h2{font-size:13px;margin:20px 4px 9px;color:var(--sub);font-weight:600;letter-spacing:.2px}
.pill{display:inline-block;padding:3px 9px;border-radius:99px;font-size:11px;font-weight:700}
.pill.now{background:color-mix(in srgb,var(--brand) 15%,transparent);color:var(--brand)}
.pill.late{background:color-mix(in srgb,var(--no) 14%,transparent);color:var(--no)}
.pill.ok{background:color-mix(in srgb,var(--ok) 14%,transparent);color:var(--ok)}
.pill.soon{background:var(--line);color:var(--sub)}

/* 주차 카드 */
.wk{display:block;width:100%;text-align:left;font-family:inherit;color:var(--fg);
  background:var(--card);border:0;border-radius:14px;padding:14px 15px;margin-bottom:10px;
  box-shadow:var(--shadow);cursor:pointer}
.wk.cur{box-shadow:inset 0 0 0 2px var(--brand),var(--shadow)}
.wk-top{display:flex;align-items:center;gap:8px;margin-bottom:3px}
.wk-top b{font-size:16px}
.wk-date{font-size:12px;color:var(--sub);margin-left:auto;white-space:nowrap}
.dots{display:flex;gap:4px;margin-top:9px}
.dot{flex:1;height:6px;border-radius:3px;background:var(--line)}
.dot.on{background:var(--ok)}.dot.half{background:var(--warn)}

/* 플래시카드 */
.flashwrap{position:relative}
.flash{background:var(--card);border-radius:18px;box-shadow:var(--shadow);min-height:44vh;
  display:flex;flex-direction:column;align-items:center;justify-content:center;
  padding:26px 18px;cursor:pointer;text-align:center;user-select:none}
.flash .en{font-size:clamp(28px,9vw,40px);font-weight:700;letter-spacing:-.5px;word-break:break-word}
.flash .ko{font-size:clamp(17px,5vw,21px);margin-top:16px;line-height:1.5}
.flash .hint{font-size:13px;color:var(--sub);margin-top:14px}
.flash .no{position:absolute;top:13px;left:16px;font-size:12px;color:var(--sub)}

.pbar{height:6px;background:var(--line);border-radius:3px;overflow:hidden;margin:2px 0 13px}
.pbar>i{display:block;height:100%;background:var(--brand);transition:width .2s}

/* 문제 */
.q{font-size:13px;color:var(--sub);margin-bottom:4px}
.qword{font-size:clamp(24px,7.5vw,33px);font-weight:700;margin:4px 0 18px;line-height:1.3;word-break:break-word}
.qword.ko{font-size:clamp(19px,5.6vw,25px)}
.opt{display:flex;align-items:center;gap:10px;width:100%;text-align:left;padding:14px 14px;
  border-radius:12px;border:0;box-shadow:inset 0 0 0 1.5px var(--line);background:var(--card);
  color:var(--fg);font-size:16px;margin-bottom:9px;cursor:pointer;font-family:inherit;
  line-height:1.4;min-height:56px;transition:.1s}
.opt:active{transform:scale(.99)}
.opt n{font-style:normal;font-size:12px;color:var(--sub);min-width:18px;font-weight:700}
.opt.sel{box-shadow:inset 0 0 0 2px var(--brand);background:color-mix(in srgb,var(--brand) 8%,transparent)}
.opt.ok{box-shadow:inset 0 0 0 2px var(--ok);background:color-mix(in srgb,var(--ok) 12%,transparent)}
.opt.no{box-shadow:inset 0 0 0 2px var(--no);background:color-mix(in srgb,var(--no) 12%,transparent)}
.opt.dim{opacity:.45}

/* 시험 하단 고정 바 */
.navbar{position:sticky;bottom:0;display:flex;gap:9px;padding:10px 0 calc(10px + env(safe-area-inset-bottom));
  background:linear-gradient(to top,var(--bg) 70%,transparent)}
.navbar>*{flex:1}
.grid{display:grid;grid-template-columns:repeat(10,1fr);gap:5px}
.grid button{aspect-ratio:1;border:0;border-radius:7px;background:var(--line);color:var(--sub);
  font-size:11px;font-family:inherit;cursor:pointer;padding:0;font-weight:600}
.grid button.done{background:var(--brand);color:#fff}
.grid button.cur{box-shadow:0 0 0 2px var(--fg)}

/* 결과·기록 */
.score{text-align:center;padding:22px 14px}
.score .big{font-size:54px;font-weight:800;letter-spacing:-1.5px;line-height:1}
.score .sub{color:var(--sub);margin-top:8px;font-size:14px;line-height:1.6}
.pass{color:var(--ok)}.fail{color:var(--no)}
.wrong{display:flex;gap:10px;align-items:baseline;padding:11px 2px;border-bottom:1px solid var(--line);font-size:15px}
.wrong:last-child{border-bottom:0}
.wrong .w-en{font-weight:700;min-width:100px;word-break:break-word}
.wrong .w-ko{color:var(--sub);flex:1;font-size:14px}
.wrong .w-my{font-size:12px;color:var(--no)}
.hist{display:flex;align-items:center;gap:11px;padding:13px 2px;border-bottom:1px solid var(--line)}
.hist:last-child{border-bottom:0}
.hist .h-w{font-weight:700;font-size:15px;min-width:46px}
.hist .h-d{font-size:12px;color:var(--sub);flex:1}
.hist .h-s{font-size:17px;font-weight:800;font-variant-numeric:tabular-nums}

/* 잠금 화면 — 모바일 전체화면 */
body.locked #tabs,
body.locked #bar{display:none}           /* 상단바까지 숨겨 한 화면으로 */
body.locked main{max-width:none;padding:0;height:100dvh}
.lock{height:100dvh;display:flex;flex-direction:column;align-items:center;
  justify-content:center;gap:0;padding:28px 24px calc(30px + env(safe-area-inset-bottom));
  max-width:360px;margin:0 auto}
.lock-head{text-align:center;margin-bottom:34px}
.lock-logo{width:66px;height:66px;margin:0 auto 18px;border-radius:20px;
  background:linear-gradient(145deg,var(--brand),#5b9bff);
  color:#fff;font-size:29px;font-weight:800;letter-spacing:-1px;
  display:flex;align-items:center;justify-content:center;
  box-shadow:0 8px 22px color-mix(in srgb,var(--brand) 38%,transparent)}
.lock-logo span{font-size:19px;opacity:.85;margin-left:1px}
.lock-title{font-size:19px;font-weight:700;letter-spacing:-.3px}
.lock-sub{font-size:14px;color:var(--sub);margin-top:6px}
.dotrow{display:flex;gap:17px;justify-content:center}
.dotrow i{width:14px;height:14px;border-radius:50%;background:var(--line);
  transition:transform .15s,background .15s}
.dotrow i.f{background:var(--brand);transform:scale(1.15)}
.lock-m{min-height:22px;font-size:13.5px;color:var(--no);
  margin:14px 0 22px;display:flex;align-items:center}
.pad{display:grid;grid-template-columns:repeat(3,72px);gap:18px;justify-content:center}
.pad button{width:72px;height:72px;border:0;border-radius:50%;background:var(--card);
  color:var(--fg);font-size:26px;font-weight:500;font-family:inherit;cursor:pointer;
  box-shadow:var(--shadow);transition:transform .08s,background .12s;
  display:flex;align-items:center;justify-content:center;padding:0}
.pad button:active{transform:scale(.92);background:var(--line)}
.pad button.fn{background:none;box-shadow:none;font-size:22px;color:var(--sub)}
.pad button.blank{background:none;box-shadow:none;pointer-events:none}
@media (max-height:680px){                /* 작은 폰에서 넘치지 않게 */
  .lock-head{margin-bottom:22px}
  .lock-logo{width:56px;height:56px;margin-bottom:13px;font-size:25px;border-radius:17px}
  .pad{grid-template-columns:repeat(3,64px);gap:14px}
  .pad button{width:64px;height:64px;font-size:24px}
  .lock-m{margin:11px 0 16px}
}
.lock.ok .dotrow i{background:var(--ok)}
.shake{animation:sh .35s}
@keyframes sh{0%,100%{transform:translateX(0)}25%{transform:translateX(-9px)}75%{transform:translateX(9px)}}

/* 문항 번호 */
.qhead{display:flex;align-items:baseline;margin:2px 2px 8px}
.qn{font-variant-numeric:tabular-nums;letter-spacing:-.5px}
.qn b{font-size:27px;font-weight:800;color:var(--brand)}
.qn em{font-style:normal;font-size:15px;color:var(--sub);margin-left:5px;font-weight:600}
.qmeta{margin-left:auto;font-size:12.5px;color:var(--sub);font-variant-numeric:tabular-nums}