:root {
  color-scheme: light;
  --bg: #fff; --fg: #18181b; --card: #fff; --border: #e4e4e7;
  --muted: #71717a; --input: transparent; --primary: #27272a;
  --primary-fg: #fafafa; --ring: #a1a1aa; --error: #b91c1c;
}
:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #18181b; --fg: #fafafa; --card: #1d1d20; --border: #ffffff1a;
  --muted: #a1a1aa; --input: #ffffff05; --primary: #fafafa;
  --primary-fg: #27272a; --ring: #71717a; --error: #f87171;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark;
    --bg: #18181b; --fg: #fafafa; --card: #1d1d20; --border: #ffffff1a;
    --muted: #a1a1aa; --input: #ffffff05; --primary: #fafafa;
    --primary-fg: #27272a; --ring: #71717a; --error: #f87171;
  }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--fg); font: 14px/1.5 "Inter", ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif; -webkit-font-smoothing: antialiased; }
main { min-height: 100vh; min-height: 100svh; display: flex; align-items: center; justify-content: center; padding: 64px 16px; }
.login { width: 100%; max-width: 352px; }
header { text-align: center; margin-bottom: 24px; }
.logo { display: block; margin: 0 auto 12px; border-radius: 12px; }
h1 { margin: 0 0 8px; font-size: 20px; font-weight: 600; line-height: 1.4; letter-spacing: -.025em; }
p { margin: 0; color: var(--muted); }
.card { border: 1px solid var(--border); border-radius: 14px; background: var(--card); padding: 24px; }
form { display: grid; gap: 16px; }
.field { display: grid; gap: 8px; }
label { font-weight: 500; line-height: 1; }
input, button { font: inherit; }
input:not([type="hidden"]) { width: 100%; min-width: 0; height: 32px; border: 1px solid var(--border); border-radius: 8px; padding: 4px 10px; background: var(--input); color: var(--fg); outline: none; transition: border-color .15s, box-shadow .15s; }
input:focus-visible, button:focus-visible { outline: none; border-color: var(--ring); box-shadow: 0 0 0 3px color-mix(in srgb, var(--ring) 35%, transparent); }
button { cursor: pointer; }
.primary { width: 100%; height: 32px; border: 1px solid transparent; border-radius: 8px; background: var(--primary); color: var(--primary-fg); font-weight: 500; transition: opacity .15s; }
.primary:hover { opacity: .85; }
.primary:disabled { opacity: .5; cursor: wait; }
.error { border: 1px solid color-mix(in srgb, var(--error) 30%, transparent); border-radius: 8px; padding: 10px 12px; color: var(--error); }
.theme-toggle { position: absolute; top: 12px; right: 12px; display: grid; place-items: center; width: 28px; height: 28px; border: 1px solid transparent; border-radius: 8px; color: var(--fg); background: transparent; }
.theme-toggle[hidden] { display: none; }
.theme-toggle:hover { background: var(--border); }
.theme-toggle svg { width: 16px; height: 16px; }
@media (max-width: 600px) { input:not([type="hidden"]) { font-size: 16px; height: 38px; } .primary { height: 38px; } }