:root{--bg: #f5f6f8;--surface: #ffffff;--surface-alt: #f0f2f5;--border: #dfe3e8;--text: #1c2530;--muted: #5d6b7a;--accent: #1f5f8b;--accent-soft: #e7f0f7;--success: #1f7a4d;--success-soft: #e6f4ec;--warning: #8a5a12;--warning-soft: #fdf3e0;--danger: #a32b2b;--danger-soft: #fbeaea;--radius: 10px;--shadow: 0 1px 2px rgba(20, 30, 45, .06), 0 4px 14px rgba(20, 30, 45, .05)}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);font-family:Segoe UI,system-ui,-apple-system,Helvetica Neue,sans-serif;font-size:15px;line-height:1.5}h1,h2,h3,h4{margin:0 0 8px;line-height:1.25}h1{font-size:24px}h2{font-size:19px}h3{font-size:16px}p{margin:0 0 10px}a{color:var(--accent)}.app{min-height:100vh;display:flex;flex-direction:column}.topbar{background:var(--surface);border-bottom:1px solid var(--border);padding:10px 20px;display:flex;align-items:center;gap:18px;flex-wrap:wrap;position:sticky;top:0;z-index:20}.brand{font-weight:700;font-size:17px;letter-spacing:-.2px}.brand span{color:var(--accent)}.nav{display:flex;gap:4px;flex-wrap:wrap}.nav button{background:none;border:none;padding:7px 12px;border-radius:8px;font:inherit;color:var(--muted);cursor:pointer}.nav button:hover{background:var(--surface-alt);color:var(--text)}.nav button.active{background:var(--accent-soft);color:var(--accent);font-weight:600}.topbar-right{margin-left:auto;display:flex;align-items:center;gap:12px}.content{flex:1;padding:22px 20px 60px;max-width:1180px;width:100%;margin:0 auto}.page-head{display:flex;align-items:flex-start;gap:16px;margin-bottom:18px;flex-wrap:wrap}.page-head .spacer{flex:1}.subtitle{color:var(--muted);margin:0;max-width:70ch}.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:16px;box-shadow:var(--shadow)}.card+.card{margin-top:14px}.grid{display:grid;gap:14px}.grid.cols-2{grid-template-columns:repeat(auto-fit,minmax(320px,1fr))}.grid.cols-3{grid-template-columns:repeat(auto-fit,minmax(260px,1fr))}.row{display:flex;gap:10px;align-items:center;flex-wrap:wrap}.row.tight{gap:6px}.stack{display:flex;flex-direction:column;gap:12px}button,.btn{font:inherit;cursor:pointer;border-radius:8px;padding:8px 14px;border:1px solid var(--border);background:var(--surface);color:var(--text)}button:hover:not(:disabled){border-color:#c6cdd5}button:disabled{opacity:.55;cursor:not-allowed}button.primary{background:var(--accent);border-color:var(--accent);color:#fff;font-weight:600}button.primary:hover:not(:disabled){background:#17506f}button.danger{color:var(--danger);border-color:#e7c3c3}button.ghost{background:none;border-color:transparent;color:var(--accent);padding:6px 8px}button.small{padding:5px 10px;font-size:13px}label{display:block;font-size:13px;font-weight:600;color:var(--muted);margin-bottom:4px}input,select,textarea{font:inherit;width:100%;padding:8px 10px;border:1px solid var(--border);border-radius:8px;background:var(--surface);color:var(--text)}input:focus,select:focus,textarea:focus{outline:2px solid var(--accent-soft);border-color:var(--accent)}textarea{min-height:90px;resize:vertical}.field{margin-bottom:12px}.field-row{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:12px}.hint{font-size:12.5px;color:var(--muted);margin-top:4px}.badge{display:inline-flex;align-items:center;gap:5px;padding:2px 9px;border-radius:999px;font-size:12.5px;font-weight:600;background:var(--surface-alt);color:var(--muted)}.badge.ok{background:var(--success-soft);color:var(--success)}.badge.warn{background:var(--warning-soft);color:var(--warning)}.badge.err{background:var(--danger-soft);color:var(--danger)}.badge.accent{background:var(--accent-soft);color:var(--accent)}.notice{border-radius:var(--radius);padding:11px 14px;margin-bottom:14px;font-size:14px}.notice.info{background:var(--accent-soft);color:#14425e}.notice.warn{background:var(--warning-soft);color:var(--warning)}.notice.err{background:var(--danger-soft);color:var(--danger)}.notice.ok{background:var(--success-soft);color:var(--success)}.notice ul{margin:6px 0 0;padding-left:18px}table{width:100%;border-collapse:collapse;font-size:14px}th,td{text-align:left;padding:8px 10px;border-bottom:1px solid var(--border);vertical-align:top}th{font-size:12.5px;text-transform:uppercase;letter-spacing:.03em;color:var(--muted)}tr:last-child td{border-bottom:none}.table-wrap{overflow-x:auto}.muted{color:var(--muted)}.small{font-size:13px}.mono{font-variant-numeric:tabular-nums}.credits{font-weight:700;color:var(--accent);font-variant-numeric:tabular-nums}.empty{padding:28px;text-align:center;color:var(--muted)}.balance-pill{display:flex;align-items:center;gap:8px;background:var(--accent-soft);color:var(--accent);padding:5px 12px;border-radius:999px;font-weight:600;font-size:14px}.block-card{border:1px solid var(--border);border-radius:var(--radius);padding:14px;background:var(--surface)}.block-card+.block-card{margin-top:10px}.block-head{display:flex;align-items:center;gap:10px;margin-bottom:8px}.block-body{white-space:pre-wrap}.block-answer{background:var(--success-soft);border-left:3px solid var(--success);padding:8px 12px;border-radius:6px;margin-top:10px;white-space:pre-wrap}.block-notes{background:var(--warning-soft);border-left:3px solid var(--warning);padding:8px 12px;border-radius:6px;margin-top:10px;white-space:pre-wrap;font-size:14px}.option{padding:6px 10px;border:1px solid var(--border);border-radius:7px;margin-top:6px}.option.correct{border-color:var(--success);background:var(--success-soft)}.board{position:fixed;top:0;right:0;bottom:0;left:0;background:#10161d;color:#f4f7fa;z-index:100;display:flex;flex-direction:column;padding:28px 40px}.board-head{display:flex;align-items:center;gap:16px;margin-bottom:18px}.board-head h2{font-size:22px;margin:0}.board-main{flex:1;overflow:auto;display:flex;flex-direction:column;gap:18px}.board-title{font-size:40px;font-weight:700;line-height:1.15}.board-text{font-size:27px;line-height:1.5;white-space:pre-wrap;max-width:46ch}.board-option{font-size:25px;padding:12px 18px;border:2px solid #2c3a49;border-radius:12px;margin-bottom:10px}.board-option.correct{border-color:#4ea87a;background:#17332a}.board-answer{font-size:25px;background:#17332a;border-left:5px solid #4ea87a;padding:16px 22px;border-radius:10px;white-space:pre-wrap}.board-steps li{font-size:26px;margin-bottom:10px}.board-foot{display:flex;align-items:center;gap:12px;padding-top:18px;border-top:1px solid #2c3a49}.board button{background:#1d2833;color:#f4f7fa;border-color:#34424f;font-size:17px;padding:12px 20px}.board button.primary{background:#2f7fb5;border-color:#2f7fb5}.board-timer{font-size:34px;font-variant-numeric:tabular-nums;font-weight:700}.board-progress{margin-left:auto;color:#9fb0c0;font-size:17px}.board-canvas{border:2px solid #2c3a49;border-radius:12px;background:#0b1015;touch-action:none}.listing-card{display:flex;flex-direction:column;gap:8px}.listing-card .price{font-size:20px;font-weight:700;color:var(--accent)}.listing-meta{display:flex;gap:10px;flex-wrap:wrap;font-size:13px;color:var(--muted)}.preview-block{border:1px dashed var(--border);border-radius:8px;padding:12px;background:var(--surface-alt)}.outline-item{display:flex;gap:10px;align-items:center;padding:7px 0;border-bottom:1px dashed var(--border);font-size:14px}.outline-item:last-child{border-bottom:none}.lock{color:var(--muted);font-size:12.5px}.modal-backdrop{position:fixed;top:0;right:0;bottom:0;left:0;background:#0f161e8c;z-index:90;display:flex;align-items:flex-start;justify-content:center;padding:40px 16px;overflow:auto}.modal{background:var(--surface);border-radius:12px;padding:20px;width:min(680px,100%);box-shadow:0 12px 40px #00000040}.auth-wrap{max-width:420px;margin:8vh auto}.tabs{display:flex;gap:6px;margin-bottom:16px}.tabs button{flex:1}.tabs button.active{background:var(--accent-soft);color:var(--accent);border-color:var(--accent-soft);font-weight:600}.progress-bar{height:8px;background:var(--surface-alt);border-radius:999px;overflow:hidden}.progress-bar>div{height:100%;background:var(--accent);transition:width .3s}@media(max-width:640px){.content{padding:16px 12px 48px}.board{padding:16px}.board-title{font-size:28px}.board-text{font-size:20px}}