:root{--bg: #ffffff;--text: #1c1c1e;--muted: #6b6b70;--card: #f4f4f6;--error: #c62828;--kakao: #fee500;--kakao-text: #191600;color-scheme:light dark}@media(prefers-color-scheme:dark){:root{--bg: #121214;--text: #f2f2f4;--muted: #a0a0a8;--card: #1e1e22;--error: #ef6b6b}}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,Apple SD Gothic Neo,Pretendard,Noto Sans KR,sans-serif}.page{min-height:100dvh;max-width:420px;margin:0 auto;padding:0 16px;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:16px;text-align:center}.logo{margin:0;font-size:40px}.slogan{margin:0 0 24px;color:var(--muted)}.muted{color:var(--muted);margin:0}.card{width:100%;background:var(--card);border-radius:16px;padding:20px;display:grid;gap:12px}.btn{width:100%;border:0;border-radius:12px;padding:16px;font-size:16px;font-weight:600;cursor:pointer}.btn:disabled{opacity:.5}.kakao{background:var(--kakao);color:var(--kakao-text)}.ghost{background:transparent;color:var(--text);border:1px solid var(--muted)}.error{color:var(--error);font-size:14px;word-break:break-all}