:root{--brand: #1e40af;--brand-light: #3b82f6;--accent: #0d9488;--accent-light: #14b8a6;--bg: #f0f4ff;--bg-gradient: linear-gradient(165deg, #eef2ff 0%, #f0fdfa 45%, #f8fafc 100%);--surface: #ffffff;--text: #0f172a;--text-muted: #64748b;--border: #e2e8f0;--danger: #dc2626;--warning: #ca8a04;--success: #16a34a;--radius: 20px;--radius-sm: 12px;--shadow: 0 4px 24px rgba(30, 64, 175, .08);--shadow-sm: 0 2px 12px rgba(0, 0, 0, .06);font-family:Inter,system-ui,-apple-system,Segoe UI,sans-serif}*{box-sizing:border-box}body{margin:0;min-height:100vh;color:var(--text);background:var(--bg);background:var(--bg-gradient)}#root{max-width:480px;margin:0 auto;padding:16px 16px 32px}.page{display:flex;flex-direction:column;gap:16px}.brand-header{display:flex;flex-direction:column;align-items:stretch;gap:10px;padding:4px 0 12px}.brand-logo{display:block;width:100%;max-width:280px;height:auto;object-fit:contain;object-position:left center;margin:0 auto;border-radius:0;box-shadow:none}.brand-tagline{margin:0;color:var(--text-muted);font-size:.92rem;line-height:1.45;text-align:center}.brand-title{margin:0;font-size:1.35rem;font-weight:800;letter-spacing:-.02em;background:linear-gradient(135deg,var(--brand) 0%,var(--accent) 100%);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.subtitle{margin:2px 0 0;color:var(--text-muted);font-size:.92rem;line-height:1.45}.card{background:var(--surface);border-radius:var(--radius);padding:18px;box-shadow:var(--shadow);border:1px solid rgba(255,255,255,.8)}.input{width:100%;border:1.5px solid var(--border);border-radius:var(--radius-sm);padding:14px;font-size:1rem;resize:vertical;font-family:inherit;background:#fafbff;transition:border-color .15s,box-shadow .15s}.input:focus{outline:none;border-color:var(--brand-light);box-shadow:0 0 0 3px #3b82f626}.modes{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin:14px 0}.mode-btn{border:1.5px solid var(--border);background:#fafbff;border-radius:var(--radius-sm);padding:10px 12px;cursor:pointer;font-size:.88rem;font-weight:600;color:var(--text);transition:all .15s}.mode-btn.active{background:linear-gradient(135deg,var(--brand) 0%,var(--brand-light) 100%);color:#fff;border-color:transparent;box-shadow:0 4px 12px #1e40af40}.primary-btn{width:100%;background:linear-gradient(135deg,var(--brand) 0%,var(--accent) 100%);color:#fff;border:none;border-radius:var(--radius-sm);padding:15px;font-size:1.05rem;font-weight:700;cursor:pointer;box-shadow:0 4px 16px #1e40af4d;transition:transform .1s,opacity .15s}.primary-btn:active:not(:disabled){transform:scale(.98)}.primary-btn:disabled{opacity:.55;cursor:not-allowed}.error{color:var(--danger);margin:12px 0 0;font-size:.9rem}.hint-card{font-size:.92rem;background:linear-gradient(135deg,#fff7ed,#fff);border-left:4px solid var(--warning)}.hint-title{font-weight:700;margin:0 0 4px;color:#92400e}.link{color:var(--brand);text-decoration:none;font-weight:600}.link:hover{text-decoration:underline}