:root{--primary: #0f766e;--primary-strong: #0d5f5a;--danger: #b91c1c;--bg: #f4f7fa;--card: #ffffff;--text: #1f2937;--muted: #6b7280;--border: #e5e7eb}*{box-sizing:border-box}body{margin:0;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,sans-serif;background:var(--bg);color:var(--text)}a{color:var(--primary)}button,input,select,textarea{font:inherit}.btn{padding:10px 16px;border:none;border-radius:8px;background:var(--primary);color:#fff;font-weight:600;cursor:pointer}.btn:disabled{opacity:.6;cursor:default}.btn.secondary{background:#fff;color:var(--primary);border:1px solid var(--primary)}.btn.danger{background:var(--danger)}.card{background:var(--card);border:1px solid var(--border);border-radius:12px;padding:20px}