:root { color-scheme: dark; --bg: #0f1014; --panel: #17181f; --line: #2a2c36; --fg: #ecedf2; --muted: #a3a6b4; --accent: #7b63ff; --error: #ff8a8a; }
* { box-sizing: border-box; }
body { margin: 0; min-height: 100vh; background: var(--bg); color: var(--fg);
  font-family: system-ui, -apple-system, "Hiragino Sans", "Noto Sans JP", sans-serif; line-height: 1.6;
  display: grid; place-items: center; padding: 24px 16px; }
.login { width: 100%; max-width: 420px; background: var(--panel); border: 1px solid var(--line); border-radius: 12px; padding: 28px 24px; }
.login-mark { margin: 0 0 8px; font-size: 11px; letter-spacing: .12em; color: var(--muted); }
h1 { margin: 0 0 4px; font-size: 22px; }
.login-lead { margin: 0 0 20px; color: var(--muted); font-size: 14px; }
form { display: grid; gap: 6px; }
label { font-size: 13px; color: var(--muted); margin-top: 8px; }
input { width: 100%; padding: 10px 12px; font-size: 16px; color: var(--fg); background: var(--bg); border: 1px solid var(--line); border-radius: 8px; }
input:focus { outline: 2px solid var(--accent); outline-offset: 1px; }
button { margin-top: 16px; padding: 11px; font-size: 15px; font-weight: 600; color: #fff; background: var(--accent); border: 0; border-radius: 8px; cursor: pointer; }
button:disabled { opacity: .6; cursor: progress; }
.login-error { min-height: 1.6em; margin: 8px 0 0; color: var(--error); font-size: 14px; }
.login-notice { margin-top: 20px; padding-top: 16px; border-top: 1px solid var(--line); font-size: 13px; color: var(--muted); }
.login-notice h2 { margin: 0 0 6px; font-size: 13px; color: var(--fg); }
.login-notice ul { margin: 0; padding-left: 1.2em; }
button.passkey { width: 100%; margin: 0 0 4px; background: transparent; border: 1px solid var(--accent); color: var(--fg); }
.login-or { display: flex; align-items: center; gap: 8px; margin: 14px 0 4px; color: var(--muted); font-size: 12px; }
.login-or::before, .login-or::after { content: ""; flex: 1; border-top: 1px solid var(--line); }
#registerButton { width: 100%; }