:root{color-scheme:light;--bg: #eef3ff;--panel: #ffffff;--panel-border: rgba(125, 135, 175, .16);--panel-inner: #f4f7ff;--muted: #7a86a5;--accent: #5c66f6;--accent-strong: #4652ee;--text: #1d2140}*{box-sizing:border-box}body{margin:0;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;background:radial-gradient(circle at 12% 8%,rgba(255,255,255,.95),transparent 45%),radial-gradient(circle at 88% 12%,rgba(255,255,255,.75),transparent 50%),radial-gradient(circle at 10% 80%,rgba(106,114,255,.12),transparent 45%),radial-gradient(circle at 90% 82%,rgba(240,75,135,.12),transparent 45%),var(--bg);color:var(--text);min-height:100vh;display:flex;align-items:center;justify-content:center;padding:48px 24px}#root{width:100%}.shell{width:100%;max-width:940px;text-align:center;margin:0 auto}.brand-header{display:grid;justify-items:center;gap:12px;margin-bottom:32px}.brand-logo{width:210px;height:auto;border-radius:18px;box-shadow:0 24px 50px #5a62a538;background:#fff}.brand{font-size:42px;font-weight:900;letter-spacing:.5px;background:linear-gradient(90deg,#f04b87,#6a72ff,#3ab7d6);-webkit-background-clip:text;color:transparent}.subtitle{color:var(--muted);letter-spacing:1px;font-size:14px;text-transform:lowercase}.panel{background:var(--panel);border-radius:28px;border:1px solid var(--panel-border);padding:32px;text-align:left;box-shadow:0 28px 60px #505b8c2e}.panel h2{font-size:22px;margin:0 0 22px;display:flex;align-items:center;gap:10px;text-transform:uppercase;letter-spacing:1px}.panel h2 .icon{color:var(--accent)}form{display:grid;gap:16px}.input-wrap{background:var(--panel-inner);border-radius:16px;border:1px solid rgba(108,120,170,.18);padding:16px 18px}input[type=url],input[type=number]{width:100%;background:transparent;border:none;color:var(--text);font-size:16px;outline:none;font-family:inherit}input[type=url]::placeholder{color:#6f6f6f}.button{background:var(--accent);color:#fff;border:none;border-radius:999px;padding:16px 24px;font-size:15px;font-weight:800;letter-spacing:1px;cursor:pointer;text-transform:uppercase;box-shadow:0 8px 24px #6a72ff52}.button:hover{background:var(--accent-strong)}.controls{display:grid;gap:10px;color:var(--muted);font-size:13px}.controls label{display:grid;gap:6px}.controls .checkbox{display:flex;align-items:center;gap:10px}.error{margin-top:16px;background:#f871711f;border:1px solid rgba(248,113,113,.35);color:#c0263c;padding:12px 14px;border-radius:12px;font-size:13px}.preview{margin-top:24px;border-top:1px solid rgba(108,120,170,.15);padding-top:20px;display:grid;gap:12px}.preview-header{display:flex;justify-content:space-between;align-items:center;font-size:13px;color:var(--muted);text-transform:uppercase;letter-spacing:2px}.preview-header a{color:var(--accent);text-decoration:none;font-size:12px;letter-spacing:1px}.preview-frame{background:#f7f8ff;border-radius:16px;border:1px solid rgba(108,120,170,.18);padding:12px}.preview-frame iframe{width:100%;height:540px;border:none;border-radius:10px;background:#fff}