:root{--paper: #FAF5E9;--paper-line: #E9E1CF;--ink: #22283A;--ink-soft: #5B6178;--violet: #6C4CF7;--violet-soft: #EEE8FF;--violet-ink: #6847F7;--coral: #FF5B57;--coral-soft: #FFEAE8;--coral-ink: #D90500;--green: #4CAF8E;--green-soft: #E3F5EE;--green-ink: #357A63;--blue: #4C8BF5;--blue-soft: #E7F0FF;--blue-ink: #0D62F1;--teal: #2EC4C6;--teal-soft: #E4FAF9;--teal-ink: #1D7C7E;--amber: #D97706;--amber-soft: #FEF0D9;--amber-ink: #A55A05;--card: #FFFFFF;--shadow: 0 10px 30px rgba(34, 40, 58, .08);--bg: var(--paper);--text: var(--ink);--text-muted: var(--ink-soft);--line: var(--paper-line);--line-focus: var(--violet-soft);--p: var(--violet-ink);--p2: var(--violet);--p-light: var(--violet-soft);--good: var(--green-ink);--good-bg: var(--green-soft);--bad: var(--coral-ink);--bad-bg: var(--coral-soft);--warn: var(--amber-ink);--shadow-sm: 0 4px 12px rgba(34, 40, 58, .06);--radius: 20px;--radius-sm: 14px}*{box-sizing:border-box;margin:0;padding:0}body{margin:0;background:linear-gradient(var(--paper-line) 1px,transparent 1px) 0 0/100% 34px,var(--paper);font-family:Gowun Dodum,Noto Sans KR,sans-serif;color:var(--text);line-height:1.6;-webkit-font-smoothing:antialiased;min-height:100vh}.app-shell{display:grid;grid-template-columns:220px 1fr;min-height:100vh}.sidebar-inner{position:sticky;top:0;height:100vh;background:var(--card);border-right:1px solid var(--paper-line);padding:28px 16px;display:flex;flex-direction:column;gap:4px}.sidebar-logo-row{display:flex;align-items:center;justify-content:space-between;gap:8px;margin:0 8px 22px}.sidebar-logo{display:flex;align-items:center;gap:8px;font-family:Do Hyeon,sans-serif;font-size:19px;color:var(--ink);text-decoration:none;margin:0}.sidebar-logo span{color:var(--coral-ink)}.sidebar-hs-badge{font-family:Gowun Dodum,Noto Sans KR,sans-serif;font-size:12px;font-weight:700;color:var(--violet-ink);background:var(--violet-soft);padding:3px 9px;border-radius:999px;flex:none}.sidebar-nav{display:flex;flex-direction:column;gap:2px}.sidebar-link{display:flex;align-items:center;gap:10px;font-family:Do Hyeon,sans-serif;font-size:15px;color:var(--ink-soft);text-decoration:none;padding:11px 14px;border-radius:14px;transition:background .15s ease,color .15s ease;cursor:pointer;border:0;background:transparent;width:100%;text-align:left}.sidebar-link .si{font-size:17px;width:20px;text-align:center}.sidebar-link:hover{background:var(--paper);color:var(--ink)}.sidebar-link.active{background:var(--violet-soft);color:var(--violet-ink)}.sidebar-footer{margin-top:auto;padding:16px 14px 0;border-top:1px solid var(--paper-line);display:flex;flex-wrap:wrap;gap:4px 10px}.sidebar-footer a{font-size:12.5px;color:var(--ink-soft);text-decoration:none}.sidebar-footer a:hover{color:var(--ink);text-decoration:underline}.main-col{min-width:0}.app{max-width:780px;margin:0 auto;padding:32px 20px 90px}.top-nav{display:flex;justify-content:space-between;align-items:center;margin-bottom:20px}.sub{font-size:13px;color:var(--text-muted);font-weight:500;margin-top:2px}.nav-actions{display:flex;gap:8px;align-items:center}.pill{background:var(--p-light);color:var(--p);padding:6px 14px;border-radius:999px;font-size:12px;font-family:Do Hyeon,sans-serif;display:inline-flex;align-items:center;gap:4px;border:1px solid var(--violet-soft)}.btn-icon{background:var(--card);border:1.5px solid var(--paper-line);border-radius:50%;width:36px;height:36px;display:flex;align-items:center;justify-content:center;cursor:pointer;transition:all .2s;font-size:16px}.btn-icon:hover{border-color:var(--violet-ink);transform:translateY(-1px)}.progress-row{display:flex;justify-content:space-between;font-size:12px;color:var(--text-muted);margin:0 4px 8px;font-weight:700}.progress-wrap{height:8px;background:var(--line);border-radius:99px;margin-bottom:20px;overflow:hidden}.progress{height:100%;background:var(--violet-ink);transition:width .35s ease;border-radius:99px}.card{background:var(--card);border:2px solid var(--paper-line);border-radius:var(--radius);padding:32px;box-shadow:var(--shadow);position:relative;transition:all .3s}.card h1,.card h2,.card h3,.card h4,.hero-title,.mode-card h3{font-family:Do Hyeon,sans-serif;font-weight:400}.card-meta{display:flex;gap:8px;align-items:center;flex-wrap:wrap;margin-bottom:20px}.tag{background:var(--paper);color:var(--ink-soft);padding:6px 12px;border-radius:999px;font-size:12px;font-weight:700;border:1px solid var(--paper-line)}.tag-subject{background:var(--p-light);color:var(--p);border-color:var(--violet-soft)}.tag-points{background:var(--amber-soft);color:var(--amber-ink);border-color:var(--amber-soft)}.diff-badge{font-size:13px;color:var(--warn);margin-left:auto;font-weight:900;letter-spacing:2px}.qno{font-size:13px;color:var(--p);font-weight:900;letter-spacing:.5px}.question-text{font-size:20px;line-height:1.8;font-weight:700;margin:14px 0 28px;word-break:keep-all}.choices{display:grid;gap:12px;margin-bottom:24px}.choice-btn{display:flex;align-items:center;gap:12px;width:100%;padding:16px 20px;text-align:left;border:1.5px solid var(--paper-line);background:var(--card);border-radius:16px;font-size:16px;font-weight:600;color:var(--text);cursor:pointer;transition:all .2s cubic-bezier(.4,0,.2,1)}.choice-btn:hover:not(.locked){border-color:var(--violet-ink);background:var(--violet-soft);transform:translateY(-1px)}.choice-btn.selected{border-color:var(--violet-ink);background:var(--violet-soft);box-shadow:0 0 0 3px #6847f726}.choice-btn.correct-highlight{border-color:var(--good)!important;background:var(--good-bg)!important;color:var(--good)!important;font-weight:800}.choice-btn.wrong-highlight{border-color:var(--bad)!important;background:var(--bad-bg)!important;color:var(--bad)!important}.choice-num{display:inline-flex;align-items:center;justify-content:center;width:26px;height:26px;border-radius:50%;background:var(--paper);font-size:13px;font-weight:800;color:var(--ink-soft);flex-shrink:0}.choice-btn.selected .choice-num{background:var(--violet-ink);color:#fff}.choice-content{flex-grow:1}.choice-btn.locked{pointer-events:none}.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;width:100%;border:0;border-radius:14px;padding:16px 24px;background:var(--violet-ink);color:#fff;font-family:Do Hyeon,sans-serif;font-size:16px;cursor:pointer;transition:all .2s;box-shadow:0 10px 24px #6847f74d}.btn:hover:not(:disabled){filter:brightness(1.08);transform:translateY(-2px)}.btn:active:not(:disabled){transform:translateY(0)}.btn:disabled{opacity:.4;cursor:not-allowed;box-shadow:none}.btn-secondary{background:var(--card);color:var(--violet-ink);border:1.5px solid var(--violet-soft);box-shadow:none}.btn-secondary:hover:not(:disabled){background:var(--violet-soft);border-color:var(--violet-ink)}.btn-outline{background:transparent;color:var(--text-muted);border:1.5px solid var(--paper-line);box-shadow:none}.btn-outline:hover{background:var(--paper);color:var(--text);border-color:var(--paper-line)}.result-box{margin-top:24px;animation:fadeIn .3s ease}@keyframes fadeIn{0%{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}.status-banner{display:flex;justify-content:space-between;align-items:center;padding:16px 20px;border-radius:16px;font-weight:900;font-size:16px;margin-bottom:20px}.status-banner.good{background:var(--good-bg);color:var(--good);border:1px solid rgba(16,185,129,.2)}.status-banner.bad{background:var(--bad-bg);color:var(--bad);border:1px solid rgba(239,68,68,.2)}.time-spent{font-size:13px;font-weight:700;opacity:.85}.solution-section{border-top:1px solid var(--line);padding-top:20px}.sol-block{margin-bottom:18px;padding:18px;border-radius:16px;background:var(--paper);border:1px solid var(--paper-line)}.sol-block h3{font-size:14px;font-weight:900;display:flex;align-items:center;gap:6px;margin-bottom:10px;color:var(--text)}.sol-block p{font-size:15px;line-height:1.8;color:#334155;word-break:keep-all}.concept-body p{font-size:15px;line-height:1.8;color:var(--ink);word-break:keep-all;margin-bottom:10px}.concept-body ul{display:flex;flex-direction:column;gap:8px;margin:4px 0 12px;padding-left:20px;list-style:disc}.concept-body li{font-size:14.5px;line-height:1.75;color:#334155;word-break:keep-all}.concept-body b{color:var(--violet-ink)}.sol-block.idea{background:var(--violet-soft);border-color:var(--violet-soft)}.sol-block.idea h3{color:var(--violet-ink)}.sol-block.trap{background:var(--coral-soft);border-color:var(--coral-soft)}.sol-block.trap h3{color:var(--coral-ink)}.sol-block.quick{background:var(--green-soft);border-color:var(--green-soft)}.sol-block.quick h3{color:var(--green-ink)}.bottom-stats{display:flex;justify-content:space-around;color:var(--text-muted);font-size:13px;margin-top:20px;padding:12px;background:var(--card);border-radius:14px;border:1px solid var(--paper-line)}.bottom-stats b{color:var(--text);font-size:15px}.hero-view{min-height:70vh;display:flex;flex-direction:column;justify-content:center;gap:24px}.hero-header{text-align:center}.hero-emoji{font-size:48px;margin-bottom:12px}.hero-title{font-size:28px;font-weight:400;margin-bottom:10px;line-height:1.4}.hero-desc{font-size:15px;color:var(--text-muted);line-height:1.7}.mode-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:14px;margin:10px 0}.mode-card{background:var(--card);border:2px solid var(--paper-line);border-radius:20px;padding:22px;cursor:pointer;transition:all .25s ease;text-align:left;position:relative;overflow:hidden}.mode-card:hover{border-color:var(--violet-ink);box-shadow:var(--shadow);transform:translateY(-2px)}.mode-card.primary-mode{border-color:var(--violet-ink);background:var(--violet-soft)}.mode-icon{font-size:28px;margin-bottom:12px}.mode-card h3{font-size:17px;font-weight:400;margin-bottom:6px;color:var(--text)}.mode-card p{font-size:13px;color:var(--text-muted);line-height:1.5}.badge-new{position:absolute;top:14px;right:14px;background:var(--violet-ink);color:#fff;font-size:10px;font-weight:900;padding:2px 8px;border-radius:99px}.filter-row{display:flex;gap:8px;flex-wrap:wrap;margin:14px 0}.filter-chip{padding:8px 14px;border-radius:999px;background:var(--paper);border:1px solid var(--paper-line);font-size:13px;font-weight:700;color:var(--ink-soft);cursor:pointer;transition:all .15s}.filter-chip.active{background:var(--violet-ink);color:#fff;border-color:var(--violet-ink)}.summary-box{text-align:center;padding:20px 0}.score-big{font-family:Do Hyeon,sans-serif;font-size:56px;color:var(--violet-ink);margin:16px 0 8px}.summary-stats-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin:24px 0}.stat-item{background:var(--paper);padding:16px 10px;border-radius:16px;border:1px solid var(--paper-line)}.stat-item .val{font-size:20px;font-weight:900;color:var(--text)}.stat-item .lbl{font-size:12px;color:var(--text-muted);margin-top:4px}@media print{body{background:#fff!important;color:#000!important}.sidebar,.top-nav,.no-print,.btn,.progress-wrap,.progress-row{display:none!important}.app-shell{display:block!important}.app{max-width:100%!important;padding:0!important;margin:0!important}.print-page{page-break-after:always;columns:2;column-gap:28px;padding:20px}.print-q-card{break-inside:avoid;border-bottom:1px solid #ddd;padding-bottom:16px;margin-bottom:20px}}@media (max-width: 768px){.app-shell{display:block}.sidebar-inner{position:sticky;top:0;z-index:20;height:auto;flex-direction:row;align-items:center;padding:10px 12px;gap:0;overflow-x:auto;-webkit-overflow-scrolling:touch;border-right:none;border-bottom:1px solid var(--paper-line)}.sidebar-logo-row{margin:0 12px 0 2px;flex:none}.sidebar-nav{flex-direction:row;gap:2px;flex:none}.sidebar-link{padding:8px 12px;white-space:nowrap}.sidebar-footer{display:none}}@media (max-width: 600px){.app{padding:16px 12px 40px}.card{padding:22px 18px;border-radius:20px}.question-text{font-size:18px}.mode-grid{grid-template-columns:1fr}}