:root{--bg:#f6f7f9;--card:#ffffff;--text:#1a202c;--muted:#64748b;--accent:#2563eb;--accent-dark:#1d4ed8;--border:#e2e8f0;--danger:#b91c1c;--ok:#15803d}*{box-sizing:border-box}body{margin:0;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif;background:var(--bg);color:var(--text)}.center-wrap{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:24px}.card{background:var(--card);border:1px solid var(--border);border-radius:12px;padding:32px;width:100%;max-width:400px;box-shadow:0 1px 3px rgba(0,0,0,.06)}.card h1{font-size:20px;margin:0 0 4px}.card .sub{color:var(--muted);font-size:14px;margin:0 0 24px}.field label{display:block;font-size:13px;font-weight:600;margin-bottom:6px}.field input{width:100%;padding:10px 12px;font-size:15px;border:1px solid var(--border);border-radius:8px;outline:none}.field input:focus{border-color:var(--accent)}.btn{width:100%;margin-top:16px;padding:10px 12px;font-size:15px;font-weight:600;color:#fff;background:var(--accent);border:none;border-radius:8px;cursor:pointer}.btn:hover{background:var(--accent-dark)}.btn:disabled{opacity:.6;cursor:default}.msg{margin-top:16px;font-size:14px}.msg.error{color:var(--danger)}.msg.ok{color:var(--ok)}.topbar{display:flex;align-items:center;justify-content:space-between;padding:12px 24px;background:var(--card);border-bottom:1px solid var(--border)}.topbar .brand{font-weight:700;font-size:16px}.topbar .user{color:var(--muted);font-size:14px;margin-right:12px}.btn-small{padding:6px 12px;font-size:13px;font-weight:600;color:var(--text);background:var(--bg);border:1px solid var(--border);border-radius:8px;cursor:pointer}.btn-small:hover{background:#eef1f5}.content{padding:24px}