:root{--brand: #25d366;--brand-dark: #128c7e;--bg: #f4f5f7;--surface: #ffffff;--text: #1f2937;--text-muted: #6b7280;--border: #e5e7eb;--danger: #dc2626;--radius: 12px;--shadow: 0 1px 3px rgba(0, 0, 0, .08), 0 1px 2px rgba(0, 0, 0, .04)}*{box-sizing:border-box}html,body{margin:0;padding:0;min-height:100%}body{font-family:Inter,Segoe UI,Roboto,system-ui,-apple-system,sans-serif;background:var(--bg);color:var(--text);-webkit-font-smoothing:antialiased}a{color:inherit;text-decoration:none}button{font-family:inherit;cursor:pointer}.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border:none;border-radius:var(--radius);padding:12px 18px;font-size:15px;font-weight:600;transition:filter .15s ease,background .15s ease}.btn:disabled{opacity:.6;cursor:not-allowed}.btn-primary{background:var(--brand);color:#fff}.btn-primary:hover:not(:disabled){background:var(--brand-dark)}.btn-secondary{background:#fff;color:var(--text);border:1px solid var(--border)}.btn-danger{background:#fff;color:var(--danger);border:1px solid var(--border)}.field{display:flex;flex-direction:column;gap:6px;margin-bottom:16px}.field label{font-size:14px;font-weight:600;color:var(--text)}.field input,.field textarea{font-family:inherit;font-size:15px;padding:11px 13px;border:1px solid var(--border);border-radius:10px;background:#fff;color:var(--text)}.field input:focus,.field textarea:focus{outline:2px solid var(--brand);outline-offset:-1px}.error-msg{color:var(--danger);font-size:14px;margin:8px 0}