/*
 * MikuAuth Example App — Material Design 3 styling.
 * Hatsune Miku accent color: #39C5BB.
 */

:root {
  --md-primary: #00897b;
  --md-on-primary: #ffffff;
  --md-primary-container: #b2f1ea;
  --md-on-primary-container: #002923;
  --md-secondary: #4a635f;
  --md-secondary-container: #cce8e2;
  --md-on-secondary-container: #06201c;
  --md-error: #ba1a1a;
  --md-error-container: #ffdad6;
  --md-on-error-container: #410002;
  --md-background: #fafdfc;
  --md-on-background: #161d1c;
  --md-surface: #fafdfc;
  --md-on-surface: #161d1c;
  --md-surface-variant: #dae5e2;
  --md-on-surface-variant: #3f4947;
  --md-surface-container: #eef2f1;
  --md-outline: #6f7977;
  --md-outline-variant: #bec9c6;

  --miku: #39c5bb;

  --shape-md: 12px;
  --shape-lg: 16px;
  --shape-xl: 28px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --md-primary: #84d5cb;
    --md-on-primary: #003731;
    --md-primary-container: #005048;
    --md-on-primary-container: #b2f1ea;
    --md-secondary: #b1ccc6;
    --md-secondary-container: #334b47;
    --md-on-secondary-container: #cce8e2;
    --md-error: #ffb4ab;
    --md-error-container: #93000a;
    --md-on-error-container: #ffdad6;
    --md-background: #0e1514;
    --md-on-background: #dee4e2;
    --md-surface: #0e1514;
    --md-on-surface: #dee4e2;
    --md-surface-variant: #3f4947;
    --md-on-surface-variant: #bec9c6;
    --md-surface-container: #1a2221;
    --md-outline: #899392;
    --md-outline-variant: #3f4947;
  }
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; min-height: 100%; }
body {
  font-family: 'Roboto', system-ui, -apple-system, sans-serif;
  background: var(--md-background);
  color: var(--md-on-background);
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--md-primary); text-decoration: none; }
a:hover { text-decoration: underline; }

.app-bar {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px 24px;
  background: var(--md-surface-container);
  border-bottom: 1px solid var(--md-outline-variant);
}

.app-bar .logo {
  font-weight: 600;
  font-size: 1.25rem;
  color: var(--md-on-surface);
  display: flex;
  align-items: center;
  gap: 8px;
}

.app-bar .logo .miku-note { color: var(--miku); font-size: 1.4rem; line-height: 1; }
.app-bar .nav { margin-left: auto; display: flex; gap: 8px; align-items: center; }

main {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 32px 16px;
}

.container { width: 100%; max-width: 480px; }

.surface-card {
  background: var(--md-surface-container);
  color: var(--md-on-surface);
  border-radius: var(--shape-xl);
  padding: 32px;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.08), 0 1px 3px rgba(0, 0, 0, 0.06);
  text-align: center;
}

h1 { font-size: 1.75rem; font-weight: 500; margin: 0 0 8px 0; }
h1 .accent { color: var(--miku); }

p.lead { color: var(--md-on-surface-variant); margin: 0 0 24px 0; }

.username-display {
  display: inline-block;
  padding: 12px 24px;
  margin: 16px 0;
  border-radius: var(--shape-md);
  background: var(--md-primary-container);
  color: var(--md-on-primary-container);
  font-size: 1.25rem;
  font-weight: 500;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 28px;
  border-radius: 999px;
  border: none;
  font: inherit;
  font-weight: 500;
  cursor: pointer;
  text-decoration: none;
  transition: filter 0.15s, background 0.15s;
}

.btn-filled { background: var(--md-primary); color: var(--md-on-primary); }
.btn-filled:hover { filter: brightness(1.1); text-decoration: none; }
.btn-outlined { background: transparent; color: var(--md-primary); border: 1px solid var(--md-outline); }
.btn-outlined:hover { background: var(--md-primary-container); text-decoration: none; }
.btn-tonal { background: var(--md-secondary-container); color: var(--md-on-secondary-container); }
.btn-tonal:hover { filter: brightness(0.97); text-decoration: none; }

.btn-row { display: flex; gap: 12px; flex-wrap: wrap; align-items: center; justify-content: center; }

.banner-error {
  background: var(--md-error-container);
  color: var(--md-on-error-container);
  padding: 12px 16px;
  border-radius: var(--shape-md);
  font-size: 0.9rem;
  margin-bottom: 16px;
  text-align: left;
}

footer {
  padding: 16px 24px;
  text-align: center;
  color: var(--md-on-surface-variant);
  font-size: 0.8rem;
  border-top: 1px solid var(--md-outline-variant);
}

footer .miku-note { color: var(--miku); }

@media (max-width: 640px) {
  main { padding: 16px 8px; }
  .surface-card { padding: 24px 20px; border-radius: var(--shape-lg); }
  .app-bar { padding: 12px 16px; }
  .btn-row { flex-direction: column; align-items: stretch; }
  .btn-row .btn { width: 100%; }
}