:root {
  --bg: #0a0a0a;
  --surface: #111111;
  --border: #222222;
  --text: #fafafa;
  --text-muted: #71717a;
  --accent: #a3e635;
  --button-bg: #1a1a1a;
  --button-border: #333333;
  --error: #ef4444;
}

* {
  box-sizing: border-box;
}

html {
  min-height: 100%;
  background: var(--bg);
}

body {
  min-height: 100vh;
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: Inter, sans-serif;
  font-size: 0.875rem;
  font-weight: 400;
  letter-spacing: 0;
}

button {
  font: inherit;
}

.page-shell {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 1rem;
}

.auth-card {
  width: min(100%, 380px);
  padding: 2rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface);
}

.brand {
  margin-bottom: 2rem;
  color: var(--text);
  font-size: 0.9375rem;
  font-weight: 600;
  line-height: 1.2;
}

.brand span {
  color: var(--accent);
}

.auth-header {
  margin-bottom: 1.5rem;
}

h1 {
  margin: 0;
  color: var(--text);
  font-size: 1.125rem;
  font-weight: 500;
  line-height: 1.4;
}

p {
  margin: 0;
  color: var(--text-muted);
  line-height: 1.6;
}

.auth-header p {
  margin-top: 0.375rem;
}

.action-stack {
  display: grid;
  gap: 1rem;
}

.auth-button {
  width: 100%;
  height: 40px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.625rem;
  border: 1px solid var(--button-border);
  border-radius: 6px;
  background: var(--button-bg);
  color: var(--text);
  cursor: pointer;
  transition: border-color 150ms ease;
}

.auth-button:hover {
  border-color: var(--accent);
}

.auth-button:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.google-icon {
  width: 18px;
  height: 18px;
  flex: 0 0 auto;
}

.divider {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 0.75rem;
  color: var(--text-muted);
}

.divider span {
  height: 1px;
  background: var(--border);
}

.divider small {
  font-size: 0.75rem;
  line-height: 1;
}

.terms {
  margin-top: 1.5rem;
  font-size: 0.8125rem;
  text-align: center;
}

.callback-state {
  display: grid;
  justify-items: center;
  gap: 1rem;
  text-align: center;
}

.spinner {
  width: 24px;
  height: 24px;
  border: 2px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 999px;
  animation: spin 800ms linear infinite;
}

.error-text {
  color: var(--error);
}

.hidden {
  display: none;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}