:root{--bg: #f6f8fa;--surface: #ffffff;--surface-2: #f0f4f7;--border: #e3e9ef;--border-strong: #d2dbe4;--text: #1f2a37;--muted: #64748b;--muted-soft: #94a3b8;--accent: #ef4e23;--accent-hover: #d63e15;--accent-soft: #fdeee7;--accent-ring: rgba(239, 78, 35, .22);--easy: #2e9e6b;--easy-soft: #e6f5ee;--medium: #c9822a;--medium-soft: #fbf1e2;--hard: #d1495b;--hard-soft: #fbe9ec;--solved: #ef4e23;--attempted: #c9822a;--blue: #2563eb;--blue-soft: #e7eefb;--radius: 14px;--radius-sm: 9px;--shadow: 0 1px 2px rgba(16, 24, 40, .04), 0 3px 12px rgba(16, 24, 40, .045);--shadow-lift: 0 8px 28px rgba(16, 24, 40, .1);--font: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;--mono: ui-monospace, "SF Mono", "Menlo", "Cascadia Code", "Fira Code", 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14px}.star-letter{width:26px;height:26px;border-radius:7px;background:var(--accent);color:#fff;display:grid;place-items:center;font-weight:700;font-size:14px;margin-bottom:8px}.saved-tag{font-size:12.5px;color:var(--easy);font-weight:600}.conf-group{display:inline-flex;gap:6px}.conf-btn{border:1px solid var(--border-strong);background:var(--surface);border-radius:8px;padding:6px 12px;font-size:13px;font-weight:600;cursor:pointer;color:var(--muted)}.conf-btn.active-1{background:var(--hard-soft);border-color:var(--hard);color:var(--hard)}.conf-btn.active-2{background:var(--medium-soft);border-color:var(--medium);color:var(--medium)}.conf-btn.active-3{background:var(--easy-soft);border-color:var(--easy);color:var(--easy)}.divider{height:1px;background:var(--border);margin:20px 0}.spinner{width:16px;height:16px;border-radius:50%;border:2px solid rgba(255,255,255,.4);border-top-color:#fff;animation:spin .7s linear infinite;display:inline-block}.spinner-dark{border-color:var(--border-strong);border-top-color:var(--accent)}@keyframes spin{to{transform:rotate(360deg)}}.back-link{display:inline-flex;align-items:center;gap:6px;color:var(--muted);font-size:14px;font-weight:500;cursor:pointer;margin-bottom:16px;background:none;border:none;padding:0}.back-link:hover{color:var(--accent)}.empty-note{text-align:center;color:var(--muted);padding:40px 20px;background:var(--surface);border:1px dashed var(--border-strong);border-radius:var(--radius)}.pill-filter{display:inline-flex;gap:7px;flex-wrap:wrap;margin-bottom:18px}.pill{padding:7px 14px;border-radius:999px;border:1px solid var(--border-strong);background:var(--surface);font-size:13.5px;font-weight:600;color:var(--muted);cursor:pointer}.pill.active{background:var(--accent);border-color:var(--accent);color:#fff}.lock-note{display:flex;align-items:center;gap:10px;background:var(--surface-2);border-radius:var(--radius-sm);padding:12px 16px;color:var(--muted);font-size:14px;margin-top:14px}.toast{position:fixed;bottom:24px;left:50%;transform:translate(-50%);background:var(--text);color:#fff;padding:12px 20px;border-radius:999px;font-size:14px;font-weight:600;box-shadow:var(--shadow-lift);z-index:100;animation:rise .2s ease}@keyframes rise{0%{opacity:0;transform:translate(-50%,10px)}}.whats-new{background:var(--accent-soft);border:1px solid #f7d9cc;border-radius:var(--radius-sm);padding:11px 13px}.whats-new-tag{font-size:12px;font-weight:700;color:var(--accent-hover)}.whats-new-body{font-size:12.5px;color:#9a5a41;margin-top:3px;line-height:1.45}.avatar{width:30px;height:30px;border-radius:8px;background:var(--accent);color:#fff;display:grid;place-items:center;font-weight:700;font-size:14px;flex-shrink:0}.avatar-lg{width:48px;height:48px;border-radius:12px;font-size:20px}.account-chip-wrap{position:relative}.account-chip{display:flex;align-items:center;gap:10px;width:100%;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-sm);padding:8px 10px;cursor:pointer;text-align:left;transition:background .12s,border-color .12s}.account-chip:hover{background:var(--surface-2);border-color:var(--border-strong)}.account-chip-text{display:flex;flex-direction:column;min-width:0;flex:1}.account-chip-name{font-size:13px;font-weight:600;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.account-chip-email{font-size:11.5px;color:var(--muted);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.account-chip-caret{color:var(--muted);font-size:14px}.account-menu{position:absolute;left:0;right:0;bottom:calc(100% + 8px);background:var(--surface);border:1px solid var(--border-strong);border-radius:var(--radius-sm);box-shadow:var(--shadow-lift);padding:6px;z-index:60}.account-menu.up{bottom:auto;top:calc(100% + 8px)}.account-menu-head{padding:8px 10px 10px;border-bottom:1px solid var(--border);margin-bottom:6px}.account-menu-item{display:block;width:100%;text-align:left;border:none;background:none;padding:9px 10px;border-radius:7px;font-size:13.5px;font-weight:500;color:var(--text);cursor:pointer}.account-menu-item:hover{background:var(--surface-2)}.account-menu-item.danger{color:var(--hard)}.account-menu-item.danger:hover{background:var(--hard-soft)}.auth-wrap{min-height:100vh;display:grid;place-items:center;background:var(--bg);padding:24px}.auth-card{width:100%;max-width:400px;background:var(--surface);border:1px solid var(--border);border-radius:18px;box-shadow:var(--shadow-lift);padding:30px 28px}.auth-brand{display:flex;align-items:center;justify-content:center;gap:10px;margin-bottom:6px}.auth-mark{width:34px;height:34px}.auth-word{font-size:23px;font-weight:800;letter-spacing:-.02em}.auth-tagline{text-align:center;color:var(--muted);font-size:13px;margin-bottom:22px}.auth-title{text-align:center;font-size:19px;margin-bottom:18px}.auth-tabs{display:grid;grid-template-columns:1fr 1fr;gap:4px;background:var(--surface-2);border-radius:10px;padding:4px;margin-bottom:22px}.auth-tabs button{border:none;background:none;padding:9px;border-radius:7px;font-size:14px;font-weight:600;color:var(--muted);cursor:pointer;transition:background .12s,color .12s}.auth-tabs button.active{background:var(--surface);color:var(--text);box-shadow:var(--shadow)}.auth-form{display:flex;flex-direction:column;gap:14px}.field{display:flex;flex-direction:column;gap:6px}.field>span{font-size:13px;font-weight:600;color:var(--text)}.field input,.text-input,.form-grid input,.form-grid select{border:1px solid var(--border-strong);border-radius:9px;padding:10px 12px;font-family:var(--font);font-size:14px;color:var(--text);background:var(--surface);width:100%}.field input:focus,.text-input:focus,.form-grid input:focus,.form-grid select:focus,.textarea:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-ring)}.text-input{display:block}.auth-submit{width:100%;margin-top:2px;padding:11px}.auth-error{background:var(--hard-soft);color:var(--hard);border-radius:8px;padding:9px 12px;font-size:13px;font-weight:500}.auth-notice{background:var(--easy-soft);color:var(--easy);border-radius:8px;padding:9px 12px;font-size:13px;font-weight:500}.auth-links{display:flex;flex-direction:column;gap:8px;align-items:center;margin-top:18px;font-size:13.5px}.auth-legal{text-align:center;color:var(--muted-soft);font-size:12px;margin-top:18px;line-height:1.5}.link{border:none;background:none;color:var(--accent);font-weight:600;cursor:pointer;font-size:inherit;padding:0}.link:hover{text-decoration:underline}.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px}@media (max-width: 560px){.form-grid{grid-template-columns:1fr}}.danger-card{border-color:#f3cdd3}.btn-danger{background:var(--hard);border-color:var(--hard);color:#fff}.btn-danger:hover{background:#b93c4c;border-color:#b93c4c}.video-card{padding:12px}.video-thumb{position:relative;height:120px;border-radius:10px;background:var(--surface-2);border:1px solid var(--border);display:grid;place-items:center;overflow:hidden}.video-play{color:var(--accent);display:grid;place-items:center}.video-duration{position:absolute;bottom:8px;right:8px;background:#0000008c;color:#fff;font-size:11.5px;font-weight:600;padding:2px 7px;border-radius:6px}.video-watched{position:absolute;top:8px;left:8px;background:#ffffffeb;color:var(--accent-hover);font-size:11.5px;font-weight:700;padding:2px 8px;border-radius:999px}.video-player{position:relative;width:100%;aspect-ratio:16 / 9;border-radius:var(--radius);overflow:hidden;border:1px solid var(--border);background:#000}.video-player iframe{position:absolute;top:0;right:0;bottom:0;left:0;width:100%;height:100%;border:0}.video-cta{display:flex;align-items:center;gap:16px;background:var(--accent);color:#fff;border-radius:var(--radius);padding:22px 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#f0dcb8}.sql-editor{width:100%;min-height:150px;border-radius:var(--radius-sm);background:#1e2530;border:1px solid #2a3340}.sql-result-wrap{overflow-x:auto}.sql-result{border-collapse:collapse;width:100%;font-size:13px}.sql-result th,.sql-result td{border:1px solid var(--border);padding:7px 11px;text-align:left;white-space:nowrap}.sql-result th{background:var(--surface-2);font-weight:700;font-size:12px}.sql-result tbody tr:nth-child(2n){background:var(--surface-2)}.sql-result td{font-family:var(--mono);font-size:12.5px}.quick-icon{width:42px;height:42px;border-radius:11px;background:var(--accent-soft);color:var(--accent);display:grid;place-items:center;margin-bottom:12px}.mkt-feature-icon{color:var(--accent)}.video-play svg,.video-play-lg svg{display:block}.badge-pro{background:#fdeee7;color:var(--accent-hover)}.upgrade-cta{width:100%;text-align:left;border:1px solid #f6d9cc;background:var(--accent-soft);border-radius:var(--radius-sm);padding:11px 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10px}.mkt-logos-label{font-size:12px;font-weight:700;letter-spacing:.1em;text-transform:uppercase;color:var(--muted);margin-bottom:14px}.mkt-logos-row{display:flex;justify-content:center;gap:10px;flex-wrap:wrap}.mkt-logo-chip{padding:7px 16px;border:1px solid var(--border);border-radius:999px;font-size:13.5px;font-weight:600;color:var(--muted);background:#fff}.mkt-quotes{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:16px;max-width:1020px;margin:0 auto;padding:0 24px}.mkt-quote{margin:0;background:#fff;border:1px solid var(--border);border-radius:14px;padding:22px;display:flex;flex-direction:column;gap:14px}.mkt-quote blockquote{margin:0;font-size:14.5px;line-height:1.65;color:var(--text)}.mkt-quote figcaption{display:flex;flex-direction:column;gap:1px}.mkt-quote-name{font-weight:700;font-size:13.5px}.mkt-quote-role{font-size:12.5px;color:var(--muted)}.mkt-mid-cta{text-align:center;margin-top:34px}.pub-pricing{max-width:1060px;margin:0 auto;padding:44px 24px 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