:root{--bg:#f7f8fa;--card:#fff;--text:#1d2330;--muted:#6b7280;--primary:#2453d6;--border:#e3e6ec;--error:#c62828}*{box-sizing:border-box}body{background:var(--bg);color:var(--text);margin:0;font-family:-apple-system,BlinkMacSystemFont,Apple SD Gothic Neo,Noto Sans KR,sans-serif}a{color:var(--primary);text-decoration:none}header{background:var(--card);border-bottom:1px solid var(--border);justify-content:space-between;align-items:center;padding:16px 24px;display:flex}header .logo{color:var(--text);font-size:18px;font-weight:700}main{max-width:960px;margin:0 auto;padding:32px 16px}.card{background:var(--card);border:1px solid var(--border);border-radius:12px;padding:28px}.auth{max-width:400px;margin:40px auto}.auth h1{margin-top:0;font-size:22px}label{color:var(--muted);margin:14px 0 6px;font-size:14px;display:block}input{border:1px solid var(--border);border-radius:8px;width:100%;padding:11px 12px;font-size:15px}button{background:var(--primary);color:#fff;cursor:pointer;border:0;border-radius:8px;padding:11px 16px;font-size:15px}button:disabled{opacity:.6}.auth button{width:100%;margin-top:20px}.error{color:var(--error);margin-top:12px;font-size:14px}.muted{color:var(--muted);font-size:14px}