.platform-page { min-height:100vh; background:#101f2e; color:#eff5fa; }
.platform-shell { max-width:760px; margin:0 auto; padding:40px 20px; }
.platform-shell h1 { margin:24px 0; }
.platform-shell a { color:#78d9c1; }
.platform-card { padding:24px; margin:20px 0; background:#203447; border:1px solid #3a4d60; border-radius:14px; }
.platform-card h2 { font-size:1.35rem; margin-bottom:16px; }
.platform-card label { margin-bottom:8px; }
.oauth-buttons { display:grid; gap:10px; margin:16px 0 24px; }
.oauth-buttons form { margin:0; }
.oauth-buttons button { width:100%; min-height:46px; font-weight:600; }
.oauth-buttons .google-button { color:#1f1f1f; background:white; border:1px solid #dadce0; }
.oauth-buttons .apple-button { color:white; background:#000; border:1px solid #555; }
.legacy-login summary { cursor:pointer; margin:16px 0; }