:root{--primary: #6c63ff;--primary-dark: #5a52d5;--accent: #4f46e5;--bg: #f5f5f7;--surface: #ffffff;--surface2: #f0f0f5;--border: #e0e0e8;--text: #1a1a2e;--text-muted: #666;--success: #00a878;--error: #e03040;--radius: 16px}body{background:var(--bg);color:var(--text)}.app{max-width:720px;margin:0 auto;padding:0 24px 40px;min-height:100vh}@media (min-width: 768px){.app{padding:0 32px 60px}.header h1{font-size:2.4rem}.btn{font-size:1.05rem}.card{padding:28px 32px}}.header{text-align:center;padding:28px 0 16px}.header h1{font-size:2rem;font-weight:800;letter-spacing:-1px}.header p{color:var(--text-muted);font-size:.95rem;margin-top:4px}.stepper{display:flex;justify-content:center;gap:24px;padding:16px 0 28px}.step{display:flex;flex-direction:column;align-items:center;gap:6px;font-size:.75rem;color:var(--text-muted)}.step.active{color:var(--primary)}.step.done{color:var(--success)}.step-dot{width:32px;height:32px;border-radius:50%;background:var(--surface);border:2px solid var(--border);display:flex;align-items:center;justify-content:center;font-weight:700;font-size:.85rem}.step.active .step-dot{border-color:var(--primary);background:var(--primary);color:#fff}.step.done .step-dot{border-color:var(--success);background:var(--success);color:#fff}.error-banner{background:#ff475726;border:1px solid var(--error);border-radius:var(--radius);padding:12px 16px;color:var(--error);margin-bottom:16px;font-size:.9rem}.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:24px;margin-bottom:16px}.card-title{font-size:1.1rem;font-weight:700;margin-bottom:16px;color:var(--accent)}.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:14px 24px;border-radius:12px;border:none;font-size:1rem;font-weight:600;cursor:pointer;transition:all .2s;text-decoration:none;width:100%}.btn:disabled{opacity:.5;cursor:not-allowed}.btn-primary{background:var(--primary);color:#fff}.btn-primary:hover:not(:disabled){background:var(--primary-dark);transform:translateY(-1px)}.btn-secondary{background:var(--surface2);color:var(--text);border:1px solid var(--border)}.btn-secondary:hover:not(:disabled){background:var(--border)}.btn-success{background:var(--success);color:#fff}.btn-accent{background:var(--accent);color:#000;font-weight:700}.input-group{margin-bottom:14px}.input-group label{display:block;font-size:.85rem;color:var(--text-muted);margin-bottom:6px}.input-group input,.input-group textarea,.input-group select{width:100%;background:var(--surface2);border:1px solid var(--border);border-radius:10px;padding:12px 14px;color:var(--text);font-size:.95rem;outline:none;transition:border-color .2s}.input-group input:focus,.input-group textarea:focus,.input-group select:focus{border-color:var(--primary)}.input-group textarea{resize:vertical;min-height:80px}.input-group select option{background:var(--surface2)}.row{display:flex;gap:12px}.row .input-group{flex:1}.btn-row{display:flex;gap:10px;margin-top:8px}.btn-row .btn{flex:1}.spinner{width:20px;height:20px;border:2px solid rgba(255,255,255,.3);border-top-color:#fff;border-radius:50%;animation:spin .7s linear infinite;display:inline-block}@keyframes spin{to{transform:rotate(360deg)}}.tag-grid{display:flex;flex-wrap:wrap;gap:8px;margin-top:10px}.tag{background:#00cfff1a;border:1px solid rgba(0,207,255,.3);color:var(--accent);padding:4px 10px;border-radius:20px;font-size:.8rem}.copy-area{position:relative;background:var(--surface2);border:1px solid var(--border);border-radius:10px;padding:14px;font-size:.9rem;line-height:1.6;white-space:pre-wrap;word-break:break-word;margin:8px 0 4px;min-height:80px}.copied-badge{position:absolute;top:8px;right:8px;background:var(--success);color:#fff;padding:2px 8px;border-radius:6px;font-size:.75rem;font-weight:700}video{width:100%;border-radius:12px;background:#000;display:block}.platform-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin-top:12px}.platform-btn{display:flex;flex-direction:column;align-items:center;gap:6px;padding:14px 8px;background:var(--surface2);border:2px solid var(--border);border-radius:12px;cursor:pointer;transition:all .2s;font-size:.8rem;color:var(--text);text-decoration:none}.platform-btn:hover{border-color:var(--primary);transform:translateY(-2px)}.platform-btn .icon{font-size:1.8rem}@media (max-width: 400px){.platform-grid{grid-template-columns:repeat(2,1fr)}.header h1{font-size:1.6rem}}