:root{--bg: #f7f7f8;--surface: #ffffff;--text: #1f2328;--muted: #656d76;--border: #d0d7de;--accent: #0b5cad;--accent-text: #ffffff;--danger: #b42318;font-family:system-ui,-apple-system,Hiragino Sans,Noto Sans JP,sans-serif;color:var(--text);background:var(--bg)}@media(prefers-color-scheme:dark){:root{--bg: #111317;--surface: #1a1d23;--text: #e6e8eb;--muted: #9aa3ad;--border: #353b45;--accent: #5aa2f0;--accent-text: #0b1220;--danger: #f97066}}body{margin:0;background:var(--bg)}a{color:var(--accent)}.app-header{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:12px 24px;background:var(--surface);border-bottom:1px solid var(--border)}.app-header .brand{font-weight:700;color:var(--text);text-decoration:none}.app-header nav{display:flex;align-items:center;gap:16px}.app-main{max-width:960px;margin:0 auto;padding:24px 16px}.card{max-width:420px;margin:0 auto;padding:24px;background:var(--surface);border:1px solid var(--border);border-radius:8px}.card h1{margin-top:0;font-size:1.4rem}.field{display:flex;flex-direction:column;gap:4px;margin-bottom:16px}.field label{font-weight:600}input{padding:8px 10px;font:inherit;color:var(--text);background:var(--bg);border:1px solid var(--border);border-radius:6px}input[aria-invalid=true]{border-color:var(--danger)}button{padding:8px 16px;font:inherit;font-weight:600;color:var(--accent-text);background:var(--accent);border:1px solid var(--accent);border-radius:6px;cursor:pointer}button:disabled{opacity:.6;cursor:default}button.secondary{color:var(--text);background:var(--surface);border-color:var(--border)}button.link{padding:0;font-weight:inherit;color:var(--accent);background:none;border:none;text-decoration:underline}.providers{display:flex;flex-direction:column;gap:8px;margin:16px 0;padding-top:16px;border-top:1px solid var(--border)}.hint,.muted{margin:0;font-size:.85rem;color:var(--muted)}.error{margin:0 0 12px;font-size:.9rem;color:var(--danger)}.error p{margin:0}.notice{margin:0 0 12px;font-size:.9rem}.settings{max-width:560px}.settings section+section{margin-top:24px;padding-top:16px;border-top:1px solid var(--border)}.settings h2{margin-top:0;font-size:1.1rem}.account-list{margin:0 0 12px;padding:0;list-style:none}.account-list li{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:8px 0}