:root {
  color-scheme: light dark;
  --bg: #fafafa; --card: #fff; --fg: #0a0a0a; --dim: #666; --line: #e5e5e5; --line2: #d4d4d4;
  --btn: #0a0a0a; --btn-fg: #fff; --err: #c62828; --focus: #2f7d4b;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #0a0a0a; --card: #111; --fg: #ededed; --dim: #8f8f8f; --line: #262626; --line2: #333;
          --btn: #ededed; --btn-fg: #0a0a0a; --err: #ff6b6b; --focus: #34d06a; }
}
* { box-sizing: border-box; }
html, body { height: 100%; margin: 0; }
body {
  display: grid; place-items: center; padding: 16px; background: var(--bg); color: var(--fg);
  font: 14px/1.5 -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, sans-serif;
}
.card { width: 100%; max-width: 360px; background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 32px 24px; }
.brand { margin-bottom: 24px; }
.wm { font-size: 22px; font-weight: 900; font-style: italic; letter-spacing: -0.045em; }
h1 { font-size: 18px; font-weight: 600; margin: 0 0 4px; letter-spacing: -0.01em; }
p { margin: 0 0 12px; }
.dim { color: var(--dim); }
section > .btn, form { margin-top: 16px; }
form { display: flex; flex-direction: column; gap: 8px; }
.btn {
  width: 100%; height: 40px; display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  font: inherit; font-weight: 600; border-radius: 999px; border: 1px solid var(--line2);
  background: transparent; color: var(--fg); cursor: pointer;
}
.btn:hover { border-color: var(--dim); }
.btn.primary { background: var(--btn); color: var(--btn-fg); border-color: var(--btn); }
.btn.ghost { color: var(--dim); }
input {
  width: 100%; height: 40px; padding: 0 14px; font: inherit; color: var(--fg); background: transparent;
  border: 1px solid var(--line2); border-radius: 999px;
}
input:focus-visible, .btn:focus-visible { outline: 2px solid var(--focus); outline-offset: 2px; }
.or { display: flex; align-items: center; gap: 12px; margin: 20px 0 4px; color: var(--dim); font-size: 12px; }
.or::before, .or::after { content: ""; flex: 1; height: 1px; background: var(--line); }
.error { color: var(--err); margin: 16px 0 0; }
.spinner { width: 20px; height: 20px; margin-top: 16px; border: 2px solid var(--line2); border-top-color: var(--fg); border-radius: 50%; animation: spin 0.8s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }
@media (prefers-reduced-motion: reduce) { .spinner { animation: none; } }
a.btn { text-decoration: none; }
.small { font-size: 12px; margin-top: 16px; }