:root {
  --bg: #0b0f14;
  --card: #121820;
  --text: #e8eef7;
  --muted: #8b9cb3;
  --accent: #3d8bfd;
  --accent2: #00c2a8;
  --danger: #ff6b6b;
  --border: rgba(255, 255, 255, 0.08);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  font-family: "DM Sans", system-ui, sans-serif;
  background: radial-gradient(1200px 600px at 10% -10%, #1a2744 0%, var(--bg) 55%);
  color: var(--text);
  display: grid;
  place-items: center;
  padding: 1rem;
}

.bg-grid {
  position: fixed;
  inset: 0;
  background-image: linear-gradient(var(--border) 1px, transparent 1px),
    linear-gradient(90deg, var(--border) 1px, transparent 1px);
  background-size: 40px 40px;
  mask-image: radial-gradient(circle at center, black, transparent 70%);
  pointer-events: none;
}

.card {
  position: relative;
  width: min(420px, 100%);
  background: color-mix(in srgb, var(--card) 92%, transparent);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 1.5rem;
  box-shadow: 0 24px 80px rgba(0, 0, 0, 0.45);
  backdrop-filter: blur(12px);
}

.brand {
  display: flex;
  gap: 0.85rem;
  align-items: center;
  margin-bottom: 1.25rem;
}

.logo {
  width: 48px;
  height: 48px;
  border-radius: 14px;
  display: grid;
  place-items: center;
  font-weight: 700;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  color: #041018;
}

h1 { margin: 0; font-size: 1.35rem; }
.subtitle { margin: 0.2rem 0 0; color: var(--muted); font-size: 0.9rem; }

.form label { display: block; margin-bottom: 0.85rem; }
.form span { display: block; font-size: 0.82rem; color: var(--muted); margin-bottom: 0.35rem; }
.form input {
  width: 100%;
  padding: 0.7rem 0.85rem;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: #0d1219;
  color: var(--text);
  font: inherit;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.65rem 1rem;
  border-radius: 12px;
  border: 1px solid var(--border);
  text-decoration: none;
  color: var(--text);
  font: inherit;
  cursor: pointer;
  transition: transform 0.15s ease, border-color 0.15s;
}

.btn:hover { transform: translateY(-1px); border-color: rgba(255,255,255,0.2); }
.btn.primary {
  width: 100%;
  border: none;
  background: linear-gradient(135deg, var(--accent), #5b6cff);
  font-weight: 600;
}

.btn.link {
  width: 100%;
  margin-top: 0.35rem;
  border: none;
  background: transparent;
  color: var(--muted);
  font-size: 0.88rem;
  font-weight: 500;
  padding: 0.45rem 0.5rem;
}

.btn.link:hover {
  color: var(--text);
  transform: none;
  background: rgba(255, 255, 255, 0.04);
}

.sso-banner {
  margin: 0 0 1rem;
  padding: 0.65rem 0.85rem;
  border-radius: 10px;
  font-size: 0.85rem;
  color: #c8e4ff;
  background: rgba(61, 139, 253, 0.12);
  border: 1px solid rgba(61, 139, 253, 0.35);
}

.divider {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin: 1rem 0;
  color: var(--muted);
  font-size: 0.8rem;
}
.divider::before, .divider::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--border);
}

.oauth-row {
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
}

.oauth {
  width: 100%;
  justify-content: flex-start;
  padding: 0.72rem 1rem;
  font-weight: 500;
  background: #0d1219;
}

.oauth-icon {
  width: 22px;
  height: 22px;
  flex-shrink: 0;
}

.oauth.google:hover:not(.oauth-disabled) {
  border-color: rgba(66, 133, 244, 0.45);
  background: rgba(66, 133, 244, 0.08);
}

.oauth.github:hover:not(.oauth-disabled) {
  border-color: rgba(255, 255, 255, 0.25);
  background: #161b22;
}

.oauth.yandex:hover:not(.oauth-disabled) {
  border-color: rgba(252, 63, 29, 0.45);
  background: rgba(252, 63, 29, 0.08);
}

.oauth-disabled {
  opacity: 0.45;
  pointer-events: none;
  cursor: not-allowed;
}

.alert {
  padding: 0.65rem 0.85rem;
  border-radius: 10px;
  background: rgba(255, 107, 107, 0.12);
  border: 1px solid rgba(255, 107, 107, 0.35);
  color: #ffc9c9;
  margin-bottom: 1rem;
  font-size: 0.9rem;
}
.hidden,
[hidden] {
  display: none !important;
}

.alert {
  margin-bottom: 1rem;
}

.hint { font-size: 0.78rem; margin-top: 1rem; }
.muted { color: var(--muted); }
code { background: #0d1219; padding: 0.1rem 0.35rem; border-radius: 6px; }

@media (max-width: 480px) {
  .card { padding: 1.1rem; border-radius: 16px; }
}