:root {
  color-scheme: light;
  --ink: #17212b;
  --muted: #627080;
  --line: #dbe2e8;
  --surface: #ffffff;
  --surface-soft: #f5f7f9;
  --accent: #196b69;
}
* { box-sizing: border-box; }
html, body { max-width: 100%; margin: 0; min-height: 100%; overflow-x: hidden; color: var(--ink); background: var(--surface-soft); font-family: Inter, Vazirmatn, system-ui, sans-serif; }
a { color: inherit; }
button, input, select, textarea { font: inherit; }
.app-header { height: 54px; display: flex; align-items: center; justify-content: space-between; gap: 2rem; padding: 0 1.25rem; color: white; background: #132a34; }
.app-header .brand { font-weight: 760; letter-spacing: .02em; text-decoration: none; }
.app-header nav { display: flex; align-items: center; gap: 1rem; }
.app-header nav a { color: #d9e6e8; text-decoration: none; }
.app-header form { margin: 0; }
.app-header button { color: #d9e6e8; border: 0; background: none; cursor: pointer; }
.messages { padding: .5rem 1.25rem; background: #fff2bf; }
.login-card { max-width: 420px; margin: 8vh auto; padding: 2rem; border: 1px solid var(--line); border-radius: 12px; background: white; }
.login-card label { display: block; margin-bottom: .3rem; }
.login-card input { width: 100%; padding: .65rem; border: 1px solid var(--line); border-radius: 6px; }
.login-card button { padding: .65rem 1rem; color: white; background: var(--accent); border: 0; border-radius: 6px; cursor: pointer; }

@media (max-width: 760px) {
  .app-header { padding-inline: .9rem; }
  .app-header nav a { display: none; }
}