:root{
  --font: "Pretendard", "Apple SD Gothic Neo", "Malgun Gothic", "Noto Sans KR", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --mono: "JetBrains Mono", "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  --bg:#f6f8fb; --bg2:#eef3f9; --panel:#ffffff; --panel2:#f8fafc; --text:#0f172a; --muted:#475569; --soft:#64748b;
  --border:#d7e0ea; --border-strong:#b9c7d8; --accent:#1d4ed8; --accent-2:#2563eb; --accent-soft:#dbeafe;
  --good:#047857; --good-bg:#d1fae5; --warn:#b45309; --warn-bg:#fef3c7; --bad:#be123c; --bad-bg:#ffe4e6;
  --shadow:0 20px 60px rgba(15,23,42,.10); --radius:22px; --base:17px; --line:1.72;
}
body.theme-dark{--bg:#07111f;--bg2:#0f172a;--panel:#111827;--panel2:#0b1220;--text:#f8fafc;--muted:#cbd5e1;--soft:#94a3b8;--border:#253248;--border-strong:#41506b;--accent:#60a5fa;--accent-2:#3b82f6;--accent-soft:#13233b;--good:#6ee7b7;--good-bg:#052e26;--warn:#fcd34d;--warn-bg:#3d2d0a;--bad:#fb7185;--bad-bg:#3f0f1d;--shadow:0 24px 70px rgba(0,0,0,.30)}
body.high-contrast{--bg:#fff;--bg2:#fff;--panel:#fff;--panel2:#fff;--text:#000;--muted:#1f2937;--soft:#374151;--border:#111827;--border-strong:#000;--accent:#003cbe;--accent-2:#003cbe;--accent-soft:#e8f0ff;--shadow:none}
body.theme-dark.high-contrast{--bg:#000;--bg2:#000;--panel:#050505;--panel2:#0d0d0d;--text:#fff;--muted:#f3f4f6;--soft:#e5e7eb;--border:#fff;--border-strong:#fff;--accent:#8cc8ff;--accent-2:#8cc8ff;--accent-soft:#111;--shadow:none}
body.font-small{--base:15.5px} body.font-medium{--base:17px} body.font-large{--base:19px} body.font-xl{--base:21px}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:linear-gradient(140deg,var(--bg),var(--bg2));color:var(--text);font-family:var(--font);font-size:var(--base);line-height:var(--line);letter-spacing:-.01em}button,input,select,textarea{font:inherit}a{color:var(--accent);text-decoration:none}a:hover{text-decoration:underline}b,strong{font-weight:850}.skip-link{position:absolute;left:-999px;top:12px;background:var(--accent);color:white;padding:10px 14px;border-radius:10px;z-index:1000}.skip-link:focus{left:12px}.topbar{position:sticky;top:0;z-index:40;display:flex;align-items:center;justify-content:space-between;gap:16px;padding:18px 24px;border-bottom:1px solid var(--border);background:color-mix(in srgb,var(--panel) 88%,transparent);backdrop-filter:blur(14px);box-shadow:0 4px 24px rgba(15,23,42,.06)}.brand{display:flex;gap:14px;align-items:center}.brand-mark{width:54px;height:54px;border-radius:18px;display:grid;place-items:center;background:linear-gradient(135deg,var(--accent),#0f766e);color:#fff;font-weight:900;box-shadow:var(--shadow)}.eyebrow{margin:0;color:var(--accent);font-size:.78rem;font-weight:900;text-transform:uppercase;letter-spacing:.12em}.brand h1{font-size:1.35rem;line-height:1.15;margin:0}.subtitle{margin:2px 0 0;color:var(--muted);font-size:.92rem}.top-actions{display:flex;flex-wrap:wrap;gap:8px;justify-content:flex-end}.chip,.btn,.nav-item,.link-btn{border:1px solid var(--border);background:var(--panel);color:var(--text);border-radius:999px;padding:10px 14px;font-weight:800;cursor:pointer;box-shadow:0 1px 2px rgba(15,23,42,.05)}.chip:hover,.btn:hover,.nav-item:hover,.link-btn:hover{border-color:var(--accent);background:var(--accent-soft);text-decoration:none}.chip.strong,.btn{background:var(--accent);border-color:var(--accent);color:#fff}.btn.secondary{background:var(--panel);color:var(--accent);border-color:color-mix(in srgb,var(--accent) 45%,var(--border))}.btn.full{width:100%;justify-content:center}.btn.mini,.chip{padding:8px 11px;font-size:.92rem}.link-btn{background:transparent;box-shadow:none;color:var(--accent);padding:6px 10px}.app-shell{display:grid;grid-template-columns:320px minmax(0,1fr);min-height:calc(100vh - 86px)}.sidebar{position:sticky;top:88px;height:calc(100vh - 88px);overflow:auto;padding:20px;border-right:1px solid var(--border);background:color-mix(in srgb,var(--panel2) 92%,transparent)}.content{min-width:0;padding:28px;max-width:1600px}.progress-panel{background:linear-gradient(135deg,var(--panel),var(--panel2));border:1px solid var(--border);border-radius:var(--radius);padding:18px;margin-bottom:16px;box-shadow:var(--shadow)}.progress-head{display:flex;align-items:center;justify-content:space-between;color:var(--muted)}.progress-head strong{font-size:1.8rem;color:var(--text)}.progress-track{height:12px;border-radius:999px;background:var(--bg2);border:1px solid var(--border);overflow:hidden}.progress-fill{height:100%;width:0%;background:linear-gradient(90deg,var(--accent),#10b981);transition:width .25s ease}.microcopy{font-size:.88rem;color:var(--muted);margin:10px 0 0}.nav-list{display:flex;flex-direction:column;gap:8px}.nav-item{width:100%;display:flex;align-items:center;gap:12px;text-align:left;border-radius:16px;padding:12px 13px;background:transparent;box-shadow:none}.nav-item span{display:grid;place-items:center;min-width:34px;height:34px;border-radius:12px;background:var(--panel);border:1px solid var(--border);color:var(--accent);font-size:.82rem;font-weight:900}.nav-item.active{background:var(--accent-soft);border-color:var(--accent);color:var(--text)}.quick-note{margin-top:16px;background:var(--panel);border:1px solid var(--border);border-radius:var(--radius);padding:14px}.quick-note label{display:block;font-weight:850;margin-bottom:8px}.quick-note textarea{min-height:120px}.view{display:none}.view.active{display:block;animation:fadeIn .18s ease}@keyframes fadeIn{from{opacity:.2;transform:translateY(4px)}to{opacity:1;transform:none}}.section-head{display:flex;align-items:flex-start;justify-content:space-between;gap:18px;margin-bottom:22px}.section-head h2{font-size:clamp(1.85rem,4vw,3.4rem);line-height:1.1;margin:4px 0 8px;letter-spacing:-.04em}.lead{max-width:900px;color:var(--muted);font-size:1.08rem;margin:0}.hero-stat,.timer-card{min-width:170px;background:var(--panel);border:1px solid var(--border);border-radius:var(--radius);padding:18px;text-align:center;box-shadow:var(--shadow)}.hero-stat strong,.timer-card span{display:block;font-size:2.1rem;line-height:1;font-weight:950;color:var(--accent)}.hero-stat span{font-size:.95rem;color:var(--muted)}.grid{display:grid;gap:18px}.grid.two{grid-template-columns:repeat(2,minmax(0,1fr))}.grid.two.wide-left{grid-template-columns:minmax(0,1.35fr) minmax(320px,.65fr)}.priority-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:16px;margin-bottom:18px}.priority-card,.card{background:var(--panel);border:1px solid var(--border);border-radius:var(--radius);padding:22px;box-shadow:var(--shadow)}.priority-card{position:relative;min-height:250px;display:flex;flex-direction:column;align-items:flex-start}.priority-card.accent{background:linear-gradient(135deg,var(--accent),#0f766e);color:white}.priority-card.accent .btn{background:#fff;color:#0f172a;border-color:#fff}.priority-card p{color:color-mix(in srgb,currentColor 82%,transparent)}.priority-card .btn{margin-top:auto}.priority-index{width:42px;height:42px;border-radius:15px;display:grid;place-items:center;background:color-mix(in srgb,currentColor 8%,transparent);border:1px solid color-mix(in srgb,currentColor 20%,transparent);font-weight:950}.priority-card h3{font-size:1.28rem;line-height:1.25;margin:16px 0 8px}.card-head,.problem-topline{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:12px}.card h3{font-size:1.35rem;line-height:1.25;margin:0 0 12px}.card-head h3{margin:0}.practical{border-color:color-mix(in srgb,var(--accent) 30%,var(--border))}.quote-box{position:relative;background:var(--accent-soft);border:1px solid color-mix(in srgb,var(--accent) 35%,var(--border));border-radius:18px;padding:18px;margin-top:14px}.quote-box p{font-size:1.1rem;font-weight:800;margin:0;padding-right:58px}.copy.mini{position:absolute;right:12px;top:12px;border:1px solid var(--border);border-radius:999px;background:var(--panel);padding:6px 9px;font-weight:800;cursor:pointer}.checklist{display:flex;flex-direction:column;gap:10px}.check-item{display:grid;grid-template-columns:auto 1fr auto;gap:12px;align-items:start;padding:14px;border:1px solid var(--border);border-radius:16px;background:var(--panel2)}.check-item input{width:21px;height:21px;margin-top:3px}.check-item b{display:block}.check-item span{display:block;color:var(--muted);font-size:.94rem}.check-item.done{border-color:color-mix(in srgb,var(--good) 45%,var(--border));background:color-mix(in srgb,var(--good-bg) 55%,var(--panel))}.stage-row{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:12px}.stage-row div{background:var(--panel2);border:1px solid var(--border);border-radius:18px;padding:16px}.stage-row span{display:block;color:var(--muted);font-size:.95rem;margin-top:6px}.toolbar{display:flex;gap:10px;flex-wrap:wrap;align-items:center;margin-top:14px}.toolbar.compact{gap:8px;margin:0}.select,.input,textarea{width:100%;border:1px solid var(--border-strong);background:var(--panel2);color:var(--text);border-radius:16px;padding:12px 14px;outline:none}.select:focus,.input:focus,textarea:focus{border-color:var(--accent);box-shadow:0 0 0 4px color-mix(in srgb,var(--accent) 15%,transparent)}textarea{min-height:150px;resize:vertical;line-height:1.6}.readable-pre,.code-readable,.output-box,pre{white-space:pre-wrap;overflow:auto;background:var(--panel2);border:1px solid var(--border);border-radius:18px;padding:18px;color:var(--text);line-height:1.72}.readable-pre{font-family:var(--font);font-size:1.06rem}.code-readable,.code-box,.output-box{font-family:var(--mono);font-size:.96rem;line-height:1.62}.script-card .readable-pre{min-height:330px}.emergency-card{background:linear-gradient(135deg,var(--panel),color-mix(in srgb,var(--warn-bg) 35%,var(--panel)))}.phrase-list{display:flex;flex-direction:column;gap:10px}.phrase{display:grid;grid-template-columns:1fr auto;gap:10px;align-items:center;border:1px solid var(--border);background:var(--panel);border-radius:16px;padding:12px}.phrase p{margin:0;font-weight:750}.phrase small{display:block;color:var(--muted);font-weight:500}.segmented{display:flex;background:var(--panel2);border:1px solid var(--border);border-radius:999px;padding:4px}.segmented button{border:0;background:transparent;color:var(--muted);padding:7px 12px;border-radius:999px;font-weight:850;cursor:pointer}.segmented button.active{background:var(--accent);color:white}.question-box{font-size:1.2rem;line-height:1.62;background:var(--accent-soft);border:1px solid color-mix(in srgb,var(--accent) 25%,var(--border));border-radius:18px;padding:18px;margin:0 0 14px;font-weight:750}.hint-box{background:var(--warn-bg);border:1px solid color-mix(in srgb,var(--warn) 35%,var(--border));color:color-mix(in srgb,var(--text) 90%,var(--warn));border-radius:16px;padding:14px;margin:10px 0}.answer-area{min-height:230px}.analysis-box{background:var(--panel2);border:1px solid var(--border);border-radius:18px;padding:16px;margin-top:12px;min-height:78px}.analysis-box ul{margin:8px 0 0;padding-left:1.3rem}.badge{display:inline-flex;align-items:center;justify-content:center;border-radius:999px;padding:8px 12px;font-weight:900;font-size:.9rem;border:1px solid var(--border)}.badge.neutral{background:var(--panel2);color:var(--muted)}.badge.good{background:var(--good-bg);color:var(--good);border-color:color-mix(in srgb,var(--good) 35%,var(--border))}.badge.bad{background:var(--bad-bg);color:var(--bad);border-color:color-mix(in srgb,var(--bad) 35%,var(--border))}.coder-layout{display:grid;grid-template-columns:360px minmax(0,1fr);gap:18px}.problem-panel{position:sticky;top:108px;max-height:calc(100vh - 132px);overflow:auto}.filter-stack{display:flex;flex-direction:column;gap:10px;margin-bottom:12px}.problem-list{display:flex;flex-direction:column;gap:8px}.problem-item{border:1px solid var(--border);border-radius:16px;padding:12px;background:var(--panel2);cursor:pointer}.problem-item:hover,.problem-item.active{border-color:var(--accent);background:var(--accent-soft)}.problem-item b{display:block;line-height:1.3}.problem-item small{display:block;color:var(--muted);margin-top:4px}.problem-workbench{min-width:0}.problem-prompt{font-size:1.07rem;color:var(--text);background:var(--panel2);border-left:5px solid var(--accent);padding:16px;border-radius:0 16px 16px 0}.examples{display:grid;gap:8px;margin:10px 0}.example{background:var(--panel2);border:1px solid var(--border);border-radius:14px;padding:10px;font-family:var(--mono);font-size:.92rem}.hint-panel{border:1px solid var(--border);border-radius:16px;background:var(--panel2);padding:12px;margin:14px 0}.hint-panel summary{font-weight:900;cursor:pointer}.code-box{min-height:420px;border-radius:18px;background:#08111f;color:#e5f0ff;border-color:#1f3556;tab-size:4}.theme-light .code-box{background:#0f172a;color:#eaf2ff}.sticky-run{position:sticky;bottom:10px;background:color-mix(in srgb,var(--panel) 90%,transparent);border:1px solid var(--border);border-radius:18px;padding:10px;backdrop-filter:blur(10px);z-index:10}.output-box{min-height:160px}.template-tabs{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:12px}.template-tabs button{border:1px solid var(--border);background:var(--panel2);color:var(--text);border-radius:999px;padding:8px 11px;font-weight:850;cursor:pointer}.template-tabs button.active{background:var(--accent);color:white;border-color:var(--accent)}.option-list{display:flex;flex-direction:column;gap:10px}.option{display:block;border:1px solid var(--border);border-radius:16px;padding:13px;background:var(--panel2);cursor:pointer}.option:hover{border-color:var(--accent)}.option.correct{background:var(--good-bg);border-color:var(--good)}.option.wrong{background:var(--bad-bg);border-color:var(--bad)}.lab-list{display:grid;gap:10px}.lab-item{border:1px solid var(--border);border-radius:16px;background:var(--panel2);padding:14px}.lab-item b{display:block}.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px}.form-grid label,.star-grid label, #articles label{font-weight:850;color:var(--muted)}.form-grid input,.star-grid textarea,#articles textarea{margin-top:6px}.flashcard-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px}.flashcard{background:var(--panel2);border:1px solid var(--border);border-radius:18px;padding:16px}.flashcard b{display:block;margin-bottom:8px}.flashcard p{color:var(--muted);margin:0}.star-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px}.star-grid textarea{min-height:120px}.saved-list{display:grid;gap:12px}.saved-star{background:var(--panel2);border:1px solid var(--border);border-radius:18px;padding:14px}.readable-list li{margin:8px 0}.toast{position:fixed;right:24px;bottom:24px;z-index:100;background:#0f172a;color:white;border-radius:999px;padding:12px 16px;box-shadow:var(--shadow);opacity:0;transform:translateY(8px);pointer-events:none;transition:all .2s ease}.toast.show{opacity:1;transform:none}.focus-mode .no-focus,.focus-mode .stage-map,.focus-mode .quick-note{display:none!important}.focus-mode .app-shell{grid-template-columns:88px minmax(0,1fr)}.focus-mode .sidebar{padding:12px}.focus-mode .nav-item b,.focus-mode .progress-panel{display:none}.focus-mode .nav-item{justify-content:center}.focus-mode .nav-item span{margin:0}@media(max-width:1180px){.priority-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.stage-row{grid-template-columns:1fr 1fr}.flashcard-grid{grid-template-columns:1fr 1fr}.grid.two.wide-left{grid-template-columns:1fr}.problem-panel{position:static;max-height:480px}.coder-layout{grid-template-columns:1fr}}@media(max-width:820px){.topbar{position:static;align-items:flex-start;flex-direction:column}.top-actions{justify-content:flex-start}.app-shell{display:block}.sidebar{position:static;height:auto;border-right:0;border-bottom:1px solid var(--border)}.content{padding:18px}.nav-list{display:grid;grid-template-columns:1fr 1fr}.quick-note{display:none}.section-head{display:block}.hero-stat,.timer-card{margin-top:12px;text-align:left}.priority-grid,.grid.two,.stage-row,.form-grid,.star-grid,.flashcard-grid{grid-template-columns:1fr}.coder-layout{display:block}.problem-panel{margin-bottom:18px}.script-card .readable-pre{min-height:240px}.code-box{min-height:360px}.focus-mode .app-shell{display:block}.focus-mode .nav-item b{display:block}.focus-mode .progress-panel{display:block}}@media(max-width:520px){body{font-size:16px}.brand-mark{width:46px;height:46px}.nav-list{grid-template-columns:1fr}.content{padding:14px}.priority-card,.card{padding:16px;border-radius:18px}.section-head h2{font-size:2rem}.toolbar{gap:8px}.btn,.chip{width:auto}.top-actions .chip{flex:1}.phrase{grid-template-columns:1fr}.readable-pre{font-size:1rem}.code-box{font-size:.88rem}}