:root{--indigo: #4f46e5;--indigo-dark: #4338ca;--bg: #f5f6fb;--card: #ffffff;--text: #1f2333;--muted: #6b7280;--border: #e5e7eb;--green: #16a34a;--amber: #d97706;font-family:Segoe UI,system-ui,-apple-system,sans-serif}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text)}a{color:var(--indigo);text-decoration:none}.container{max-width:1040px;margin:0 auto;padding:24px 16px}button{font:inherit;cursor:pointer;border:none;border-radius:8px;padding:10px 16px;background:var(--indigo);color:#fff;transition:background .15s ease,opacity .15s ease}button:hover:not(:disabled){background:var(--indigo-dark)}button:disabled{opacity:.5;cursor:not-allowed}button.ghost{background:transparent;color:var(--indigo);border:1px solid var(--indigo)}.navbar{background:var(--card);border-bottom:1px solid var(--border)}.navbar-inner{max-width:1040px;margin:0 auto;padding:12px 16px;display:flex;align-items:center;gap:20px}.brand{font-size:1.3rem;font-weight:700;color:var(--indigo)}.nav-links{display:flex;gap:16px;align-items:center;margin-left:auto}.menu{display:flex;flex-wrap:wrap;gap:24px;margin-top:16px}.menu-section{background:var(--card);border:1px solid var(--border);border-radius:12px;padding:16px;flex:1 1 320px}.level-row{display:flex;gap:8px;flex-wrap:wrap;margin:10px 0}.chip{padding:4px 10px;border-radius:999px;background:#eef2ff;color:var(--indigo);font-size:.85rem}.set-list{list-style:none;padding:0;margin:0}.set-item{display:flex;justify-content:space-between;align-items:center;padding:10px 12px;border:1px solid var(--border);border-radius:8px;margin-bottom:8px;background:var(--card)}.locked{opacity:.6}.flashcard{background:var(--card);border:1px solid var(--border);border-radius:16px;padding:32px;text-align:center;box-shadow:0 6px 20px #0000000f}.flashcard .word{font-size:2.4rem;font-weight:700;margin:0}.flashcard .pronunciation{color:var(--muted);font-style:italic;margin:6px 0 0}.flashcard .pos{color:var(--muted);font-style:italic}.example-list{margin:6px 0 0;padding-left:1.2rem}.example-list li{margin-bottom:6px}.card-buttons{display:flex;gap:10px;justify-content:center;margin-top:24px;flex-wrap:wrap}.panel{margin-top:20px;text-align:left;background:#f9fafb;border:1px solid var(--border);border-radius:10px;padding:16px;white-space:pre-wrap}.panel.markdown,.panel.define-panel{white-space:normal;line-height:1.55}.panel.markdown h1,.panel.markdown h2,.panel.markdown h3,.panel.markdown h4{margin:14px 0 8px;font-size:1.05rem;font-weight:700}.panel.markdown h1:first-child,.panel.markdown h2:first-child,.panel.markdown h3:first-child,.panel.markdown p:first-child{margin-top:0}.panel.markdown p{margin:0 0 10px}.panel.markdown ul,.panel.markdown ol{margin:0 0 10px;padding-left:1.3rem}.panel.markdown li{margin-bottom:4px}.panel.markdown strong{font-weight:700}.panel.markdown p:last-child,.panel.markdown ul:last-child,.panel.markdown ol:last-child{margin-bottom:0}.progress-bar{display:flex;justify-content:space-between;align-items:center;margin-bottom:16px;color:var(--muted)}.notice{padding:10px 14px;border-radius:8px;background:#fef3c7;color:#92400e;margin:12px 0}.card-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:16px}.plan-card{background:var(--card);border:1px solid var(--border);border-radius:12px;padding:20px;display:flex;flex-direction:column}.plan-card.featured{border-color:var(--indigo);box-shadow:0 6px 20px #4f46e51f}.plan-card.current{border-color:var(--green)}.plan-kicker{margin:0 0 4px;font-size:.75rem;font-weight:700;letter-spacing:.06em;text-transform:uppercase;color:var(--indigo)}.plan-card h2{margin:0 0 8px}.plan-price{font-size:1.8rem;font-weight:700;color:var(--indigo);margin:0}.plan-features{margin:12px 0 20px;padding-left:18px;color:var(--text);flex:1}.plan-features li{margin-bottom:6px}.plan-note{margin:0;color:var(--muted)}.compare-heading{margin-top:40px}.compare-wrap{overflow-x:auto;margin-top:12px;background:var(--card);border:1px solid var(--border);border-radius:12px}.compare-table{width:100%;border-collapse:collapse;min-width:640px}.compare-table th,.compare-table td{padding:12px 16px;text-align:center;border-bottom:1px solid var(--border);vertical-align:middle}.compare-table thead th{font-size:1rem}.compare-table th:first-child,.compare-table td:first-child{text-align:left;position:sticky;left:0;background:var(--card);z-index:1}.compare-table tbody th{font-weight:600}.compare-table tfoot td,.compare-table tfoot th{border-bottom:none}.compare-table .highlight,.compare-table th.highlight:first-child,.compare-table td.highlight:first-child,.compare-table thead th.highlight,.compare-table tbody td.highlight,.compare-table tfoot td.highlight{background:#eef2ff}.compare-sub{display:block;font-size:.8rem;font-weight:400;color:var(--muted);margin-top:4px}.compare-you{display:inline-block;margin-top:6px;padding:2px 8px;border-radius:999px;background:#eef2ff;color:var(--indigo);font-size:.75rem;font-weight:700}.compare-table .highlight .compare-you{background:#fff}.compare-yes{color:var(--green);font-weight:600}.compare-no{color:var(--muted)}