:root{--blue:#2563eb;--green:#16a34a;--yellow:#F5C518;--gray:#6b7280;--red:#dc2626;--bg:#f8fafc;--card:#fff;--border:#e2e8f0;}
*{box-sizing:border-box;margin:0;padding:0}
body{font-family:'Malgun Gothic','Apple SD Gothic Neo',sans-serif;background:var(--bg);color:#1e293b;min-height:100vh}

/* ── 인덱스(홈) ── */
.home{min-height:100vh;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:24px;}
.home-card{background:#fff;border-radius:20px;box-shadow:0 4px 24px rgba(0,0,0,.1);padding:36px 28px;max-width:420px;width:100%;text-align:center;}
.logo-name{font-size:1.6rem;font-weight:900;margin-bottom:4px;}
.logo-name .gray{color:var(--gray);}
.logo-name .yellow{color:var(--yellow);}
.logo-eng{font-family:Georgia,serif;font-style:italic;color:var(--yellow);font-size:.85rem;margin-bottom:20px;}
.home h1{font-size:1.1rem;font-weight:800;color:#1e293b;margin-bottom:6px;}
.home .subtitle{font-size:.85rem;color:#64748b;margin-bottom:24px;}
.btn{display:block;background:var(--blue);color:#fff;text-decoration:none;border-radius:14px;padding:18px 20px;margin-bottom:14px;font-size:1rem;font-weight:700;transition:.15s;-webkit-tap-highlight-color:transparent;}
.btn:active{opacity:.85;transform:scale(.98);}
.btn span.sub{display:block;font-size:.78rem;font-weight:400;opacity:.85;margin-top:4px;}
.btn.alt{background:#1e293b;}
.footer{margin-top:18px;font-size:.72rem;color:#94a3b8;line-height:1.6;}

/* ── 학습 페이지 헤더 ── */
.site-header{background:#1e293b;color:#fff;padding:16px 24px;display:flex;align-items:center;gap:16px;flex-wrap:wrap}
.logo-wrap{display:flex;align-items:center;gap:10px;flex-shrink:0}
.logo-text{line-height:1.2}
.site-header .logo-name{font-size:1.4rem;font-weight:900;letter-spacing:.02em;margin:0}
.site-header .logo-name .gray{color:#ccc}
.site-header .logo-eng{margin:2px 0 0}
.header-info{flex:1}
.header-info h1{font-size:1.1rem;font-weight:800;color:#fff;margin-bottom:2px}
.header-info p{font-size:.78rem;color:#94a3b8}
.home-link{font-size:.72rem;color:#94a3b8;text-decoration:none;border:1px solid #475569;border-radius:6px;padding:4px 10px;}
.home-link:hover{color:#fff;border-color:#fff}
.copyright{font-size:.7rem;color:#94a3b8;text-align:right;line-height:1.6;margin-left:auto}

/* ── 탭 ── */
.tab-nav{display:flex;background:#1e293b;border-bottom:3px solid var(--yellow);overflow-x:auto}
.tab-btn{padding:12px 22px;background:none;border:none;color:#94a3b8;font-size:.9rem;font-weight:700;cursor:pointer;white-space:nowrap;transition:.2s;font-family:inherit;min-height:44px;-webkit-tap-highlight-color:transparent;touch-action:manipulation;}
.tab-btn.active{color:#1e293b;background:var(--yellow);border-radius:4px 4px 0 0}
.tab-btn:hover:not(.active){color:#fff}
.tab-panel{display:none;padding:24px;max-width:900px;margin:0 auto}
.tab-panel.active{display:block}
.sec-title{font-size:1.05rem;font-weight:800;color:var(--blue);margin:28px 0 12px;padding-bottom:6px;border-bottom:2px solid var(--border)}
.sec-title:first-child{margin-top:0}
.hint-line{font-size:.8rem;color:var(--gray);margin-bottom:12px}

/* ── 플래시카드 ── */
.fc-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(160px,200px));gap:14px;margin-bottom:24px;}
.fc-item{position:relative;aspect-ratio:3/2;cursor:pointer;-webkit-tap-highlight-color:transparent;user-select:none;-webkit-user-select:none;touch-action:manipulation;}
.fc-inner{position:absolute;inset:0;cursor:pointer;}
.fc-front,.fc-back{position:absolute;inset:0;border-radius:12px;padding:14px;display:flex;flex-direction:column;justify-content:center;align-items:center;text-align:center;box-shadow:0 2px 8px rgba(0,0,0,.1);transition:opacity .3s ease;}
.fc-front{background:var(--blue);color:#fff;opacity:1;z-index:2;}
.fc-back{background:#1e293b;color:#fff;opacity:0;z-index:1;}
.fc-inner.flipped .fc-front{opacity:0;z-index:1;}
.fc-inner.flipped .fc-back{opacity:1;z-index:2;}
.fc-phrase{font-size:1.15rem;font-weight:700;margin-bottom:6px;}
.fc-hint{font-size:.78rem;opacity:.55;margin-top:10px;}
.fc-meaning{font-size:1.02rem;font-weight:700;margin-bottom:8px;color:var(--yellow);}
.fc-ex{font-size:.82rem;opacity:.85;line-height:1.5;}

/* ── 퀴즈 ── */
.quiz-section{margin-bottom:4px}
.q-block{background:var(--card);border:1px solid var(--border);border-radius:12px;padding:16px;margin-bottom:14px}
.q-num{font-size:.78rem;font-weight:700;color:var(--gray);margin-bottom:4px}
.q-label{background:var(--blue);color:#fff;border-radius:4px;padding:1px 6px;font-size:.7rem}
.q-text{font-size:.93rem;line-height:1.65;margin-bottom:12px;white-space:pre-wrap}
.q-options{display:flex;flex-direction:column;gap:7px}
.opt-btn{background:#f1f5f9;border:1.5px solid var(--border);border-radius:8px;padding:12px 14px;text-align:left;cursor:pointer;font-size:.88rem;line-height:1.5;transition:.15s;font-family:inherit;min-height:48px;-webkit-tap-highlight-color:transparent;touch-action:manipulation;width:100%;}
.opt-btn:hover:not(:disabled){background:#e0e7ff;border-color:#818cf8}
.opt-btn.correct{background:#d1fae5!important;border-color:var(--green)!important;color:#065f46;font-weight:700}
.opt-btn.wrong{background:#fee2e2!important;border-color:var(--red)!important;color:#991b1b}
.opt-btn:disabled{cursor:default}
.exp-box{margin-top:10px;background:#fefce8;border:1px solid #fef08a;border-radius:8px;padding:10px 14px;font-size:.83rem;line-height:1.6;color:#713f12}
.exp-box.hidden{display:none}
.score-bar{background:#1e293b;color:#fff;border-radius:10px;padding:12px 18px;margin-bottom:16px;display:flex;align-items:center;gap:14px;flex-wrap:wrap}
.score-txt{font-size:.95rem;font-weight:700;color:var(--yellow);min-width:60px}
.prog-wrap{flex:1;min-width:80px}
.prog-bar{height:6px;background:#334155;border-radius:3px;overflow:hidden}
.prog-fill{height:100%;background:var(--green);border-radius:3px;width:0%;transition:.3s}
.reset-btn{background:var(--yellow);color:#1e293b;border:none;border-radius:7px;padding:6px 16px;font-size:.82rem;font-weight:700;cursor:pointer;font-family:inherit;-webkit-tap-highlight-color:transparent;touch-action:manipulation;}
.concept-box{background:linear-gradient(135deg,#1e293b,#334155);color:#fff;border-radius:12px;padding:16px 20px;margin-bottom:18px}
.concept-box h3{color:var(--yellow);margin-bottom:8px;font-size:.95rem}
.concept-box ul{padding-left:16px;line-height:2;font-size:.85rem}
.concept-box code{background:rgba(255,255,255,.15);padding:1px 7px;border-radius:4px;font-family:monospace;font-size:.9em}
.passage-box{background:#f0f9ff;border-left:4px solid var(--blue);border-radius:0 10px 10px 0;padding:14px 18px;margin-bottom:18px;line-height:1.9;font-size:.9rem}
.passage-box h4{color:var(--blue);margin-bottom:8px;font-size:.9rem;font-weight:700}
.passage-box .ko{color:#64748b;font-size:.82rem}
.dialog-box{background:#fff;border:1px solid var(--border);border-radius:12px;padding:14px 18px;margin-bottom:14px;line-height:1.8;font-size:.9rem}
.dialog-box .role{font-weight:700;color:var(--blue);margin-right:6px}
.dialog-box .ko{color:#94a3b8;font-size:.82rem}
.dialog-title{font-weight:700;color:#1e293b;margin-bottom:6px;font-size:.86rem}

/* ── 모바일 ── */
@media(max-width:600px){
  .site-header{padding:12px 14px;gap:8px;}
  .site-header .logo-name{font-size:1.15rem;}
  .header-info h1{font-size:.9rem;}
  .copyright{display:none;}
  .tab-btn{padding:10px 12px;font-size:.82rem;}
  .tab-panel{padding:14px 12px;}
  .fc-grid{grid-template-columns:repeat(2,1fr);max-width:100%;}
  .q-block{padding:12px 10px;}
  .q-text{font-size:.87rem;}
  .opt-btn{font-size:.84rem;}
}
@media(max-width:380px){
  .fc-grid{grid-template-columns:1fr;}
}

/* ── 결과·피드백 ── */
.big-btn{display:block;width:100%;max-width:360px;margin:6px auto 22px;background:var(--blue);color:#fff;border:none;border-radius:14px;padding:16px;font-size:1.05rem;font-weight:800;cursor:pointer;font-family:inherit;-webkit-tap-highlight-color:transparent;}
.big-btn:active{transform:scale(.98);opacity:.9}
.result-summary{display:flex;align-items:center;gap:18px;background:linear-gradient(135deg,#1e293b,#334155);color:#fff;border-radius:16px;padding:20px 24px;margin-bottom:8px}
.rs-score{font-size:2.6rem;font-weight:900;color:var(--yellow);line-height:1}
.rs-score span{font-size:1rem;margin-left:2px}
.rs-meta{font-size:.92rem;line-height:1.6}
.rs-sub{font-size:.8rem;color:#cbd5e1;margin-top:2px}
.area-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:12px;margin-bottom:8px}
.area-card{background:#fff;border:1px solid var(--border);border-left:5px solid #94a3b8;border-radius:10px;padding:12px 14px}
.area-card.lv-good{border-left-color:var(--green)}
.area-card.lv-mid{border-left-color:#f59e0b}
.area-card.lv-low{border-left-color:var(--red)}
.area-name{font-weight:700;font-size:.9rem;margin-bottom:8px}
.area-bar{height:8px;background:#e2e8f0;border-radius:4px;overflow:hidden;margin-bottom:6px}
.area-fill{height:100%;background:var(--blue);border-radius:4px}
.area-card.lv-good .area-fill{background:var(--green)}
.area-card.lv-mid .area-fill{background:#f59e0b}
.area-card.lv-low .area-fill{background:var(--red)}
.area-score{font-size:.82rem;color:#475569}
.type-table{display:flex;flex-direction:column;gap:6px;margin-bottom:8px}
.type-row{display:flex;align-items:center;gap:10px;font-size:.82rem}
.type-name{flex:0 0 38%;color:#334155}
.type-bar{flex:1;height:10px;background:#e2e8f0;border-radius:5px;overflow:hidden}
.type-fill{display:block;height:100%;background:var(--blue)}
.type-fill.lv-good{background:var(--green)}.type-fill.lv-mid{background:#f59e0b}.type-fill.lv-low{background:var(--red)}
.type-num{flex:0 0 44px;text-align:right;color:#475569;font-weight:700}
.rx-card{border-radius:10px;padding:12px 16px;margin-bottom:10px;font-size:.88rem;line-height:1.6}
.rx-low{background:#fef2f2;border:1px solid #fecaca;color:#991b1b}
.rx-mid{background:#fffbeb;border:1px solid #fde68a;color:#92400e}
.rx-good{background:#f0fdf4;border:1px solid #bbf7d0;color:#166534;font-weight:600}
.rx-note{font-size:.8rem;color:#64748b;margin-top:8px;line-height:1.6}
.q-text u{text-decoration:underline;text-decoration-thickness:2px;text-underline-offset:3px;font-weight:600;}
.rs-comment{font-size:1.15rem;font-weight:900;margin-bottom:6px;}
.oc-90{color:#bbf7d0}.oc-80{color:#fde68a}.oc-70{color:#fdba74}.oc-low{color:#fca5a5}
.rx-missed{margin-top:6px;font-size:.85rem}
.rx-type{display:inline-block;background:#1e293b;color:#fff;border-radius:5px;padding:1px 8px;margin:2px;font-size:.8rem;font-weight:700}
.rx-tip{margin-top:6px}
@media(max-width:600px){
  .area-grid{grid-template-columns:1fr;}
  .type-name{flex-basis:42%;}
  .rs-score{font-size:2rem}
}