body{margin:0;font-family:system-ui,'Hiragino Kaku Gothic ProN','Yu Gothic',Meiryo,sans-serif;line-height:1.6} .container{max-width:1120px;margin:0 auto;padding:0 16px} header{position:sticky;top:0;border-bottom:1px solid #eaeaea;background:#fff} .nav{height:64px;display:flex;align-items:center;justify-content:space-between} .card{border:1px solid #eaeaea;border-radius:14px;padding:18px;background:#fff} .row{display:grid;grid-template-columns:1fr 1fr;gap:12px} .btn{display:inline-block;padding:14px 18px;border-radius:12px;background:#111;color:#fff;border:none;font-weight:800;cursor:pointer} .error{color:#c62828;font-size:13px;display:none}