:root{--bg: #f5f6fa;--card: #ffffff;--text: #1f2430;--text-sub: #6b7280;--primary: #2563eb;--primary-dark: #1d4ed8;--border: #e5e7eb;--danger: #dc2626;--success: #16a34a;--warn: #d97706;--radius: 12px}*{box-sizing:border-box;margin:0;padding:0}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,PingFang SC,Hiragino Sans GB,Microsoft YaHei,sans-serif;background:var(--bg);color:var(--text);line-height:1.6}a{color:var(--primary);text-decoration:none}button{cursor:pointer;font-family:inherit;font-size:14px}.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;padding:10px 18px;border:none;border-radius:8px;background:var(--primary);color:#fff;font-weight:500;transition:background .15s}.btn:hover{background:var(--primary-dark)}.btn:disabled{background:#9ca3af;cursor:not-allowed}.btn-ghost{background:transparent;color:var(--primary);border:1px solid var(--primary)}.btn-ghost:hover{background:#eff6ff}.btn-danger{background:var(--danger)}.btn-danger:hover{background:#b91c1c}input,textarea,select{font-family:inherit;font-size:14px;padding:10px 12px;border:1px solid var(--border);border-radius:8px;width:100%;background:#fff;color:var(--text)}input:focus,textarea:focus,select:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px #2563eb1f}textarea{resize:vertical;min-height:100px}.card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:20px;box-shadow:0 1px 3px #0000000d}.container{max-width:960px;margin:0 auto;padding:24px 16px}.page-title{font-size:22px;font-weight:600;margin-bottom:16px}.muted{color:var(--text-sub);font-size:13px}.badge{display:inline-block;padding:2px 10px;border-radius:999px;font-size:12px;font-weight:500}.badge-syntax{background:#fee2e2;color:#b91c1c}.badge-runtime{background:#fef3c7;color:#b45309}.badge-logic{background:#dbeafe;color:#1d4ed8}pre.code-block{background:#0f172a;color:#e2e8f0;padding:16px;border-radius:8px;overflow-x:auto;font-family:JetBrains Mono,Fira Code,Consolas,monospace;font-size:14px;line-height:1.5;white-space:pre-wrap;word-break:break-word}.flex{display:flex}.flex-col{flex-direction:column}.items-center{align-items:center}.justify-between{justify-content:space-between}.gap-2{gap:8px}.gap-4{gap:16px}.mt-2{margin-top:8px}.mt-4{margin-top:16px}.mt-6{margin-top:24px}.mb-2{margin-bottom:8px}.mb-4{margin-bottom:16px}.w-full{width:100%}