:root{--bg:#faf8f6;--card:#fff;--primary:#e15f14;--primary-dark:#c04e0e;--primary-light:#fbe8dc;--text:#1c1917;--muted:#7a726c;--border:#eae5e1;--correct:#16a34a;--wrong:#dc2626;--radius:14px}*{box-sizing:border-box;margin:0;padding:0}body,html{background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,Apple SD Gothic Neo,Malgun Gothic,맑은 고딕,sans-serif;-webkit-font-smoothing:antialiased}a{color:inherit;text-decoration:none}.container{max-width:860px;margin:0 auto;padding:0 16px}.nav{background:var(--card);border-bottom:1px solid var(--border);position:-webkit-sticky;position:sticky;top:0;z-index:10}.nav-inner{max-width:860px;margin:0 auto;padding:12px 16px;display:flex;align-items:center;justify-content:space-between}.nav-brand{font-weight:800;font-size:18px;color:var(--primary)}.nav-links{display:flex;gap:18px;align-items:center;font-size:14px}.card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:20px}.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(180px,1fr));grid-gap:14px;gap:14px}.btn{display:inline-flex;align-items:center;gap:8px;background:var(--primary);color:#fff;border:none;border-radius:10px;padding:10px 16px;font-size:14px;font-weight:600;cursor:pointer}.btn:hover{background:var(--primary-dark)}.btn-ghost{background:transparent;color:var(--primary);border:1px solid var(--border)}.badge,.btn-ghost:hover{background:var(--primary-light)}.badge{display:inline-block;font-size:12px;padding:2px 8px;border-radius:999px;color:var(--primary-dark);font-weight:600}.subject-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(160px,1fr));grid-gap:12px;gap:12px}.subject-card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:18px;text-align:left;cursor:pointer;transition:border-color .12s,transform .12s}.subject-card:hover{border-color:var(--primary);transform:translateY(-2px)}.cal-cell{border-radius:8px;padding:6px;min-height:52px;text-align:left;display:flex;flex-direction:column}.muted{color:var(--muted)}.subject-progress-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));grid-gap:14px;gap:14px}.subject-progress-counts{display:grid;grid-template-columns:repeat(2,1fr);grid-gap:8px;gap:8px;margin-top:16px}.subject-progress-counts span{padding:10px 6px;border-radius:10px;background:var(--bg);text-align:center}.subject-progress-counts small,.subject-progress-counts strong{display:block}.subject-progress-counts strong{font-size:20px}.subject-progress-counts small{color:var(--muted);font-size:11px;margin-top:3px}.notes-hero{margin-bottom:18px;background:linear-gradient(135deg,#fff8ef 0,var(--card) 62%)}.notes-hero h1{margin:8px 0;font-size:clamp(26px,5vw,38px)}.notes-tabs{display:flex;flex-wrap:wrap;gap:8px;margin-top:20px}.notes-tab{border:1px solid var(--border);border-radius:999px;padding:9px 14px;background:var(--card);color:var(--text);cursor:pointer;font:inherit;font-size:13px;font-weight:700}.notes-tab.is-active,.notes-tab:hover{border-color:var(--primary);background:var(--primary);color:#fff}.notes-layout{display:grid;grid-gap:18px;gap:18px}.note-section{scroll-margin-top:80px}.note-section h2{margin:0 0 18px;font-size:23px}.note-section h3{margin:24px 0 10px;font-size:17px}.note-list{margin:8px 0 0;padding-left:20px;line-height:1.75}.note-table{width:100%;border-collapse:collapse;margin-top:10px;font-size:13px}.note-table td,.note-table th{border:1px solid var(--border);padding:9px 10px;text-align:left;vertical-align:top}.note-table th{background:var(--bg);font-weight:700}.ascii-diagram{overflow-x:auto;margin:12px 0;padding:16px;border:1px solid var(--border);border-radius:12px;background:#1f2937;color:#f9fafb;font:12px/1.55 ui-monospace,SFMono-Regular,Menlo,monospace;white-space:pre}.note-callout{margin-top:14px;padding:13px 15px;border-left:4px solid var(--primary);border-radius:8px;background:var(--primary-light);line-height:1.65}.note-nav{display:flex;flex-wrap:wrap;gap:8px;margin-top:18px}.note-nav a{color:var(--primary-dark);text-decoration:none;font-size:13px;font-weight:700}@media (max-width:640px){.nav-brand{font-size:15px}.nav-links{gap:12px;font-size:13px;flex-wrap:wrap;justify-content:flex-end}.nav-inner{padding:10px 14px}.card{padding:16px}.section-title{font-size:18px}.grid,.subject-grid{grid-template-columns:1fr 1fr}}@media (max-width:400px){.grid,.subject-grid{grid-template-columns:1fr}}.section-title{font-size:20px;font-weight:800;margin:28px 0 14px}