:root,
[data-theme="dark"] {
  --auth-bg: #07070d;
  --auth-surface: rgba(255, 255, 255, 0.06);
  --auth-border: rgba(255, 255, 255, 0.12);
  --auth-text: rgba(255, 255, 255, 0.94);
  --auth-muted: rgba(255, 255, 255, 0.58);
  --auth-primary: #8c52ff;
  --auth-accent: #00d4ff;
}

[data-theme="light"] {
  --auth-bg: #f1f5f9;
  --auth-surface: #ffffff;
  --auth-border: rgba(15, 23, 42, 0.12);
  --auth-text: #0f172a;
  --auth-muted: #64748b;
  --auth-primary: #6d28d9;
  --auth-accent: #0891b2;
}

[data-theme="light"] .auth-body {
  background: linear-gradient(165deg, #f8fafc, #e2e8f0);
}

.auth-body {
  min-height: 100vh;
  margin: 0;
  padding-bottom: 3rem;
  color: var(--auth-text);
  background:
    radial-gradient(900px 500px at 15% -5%, rgba(140, 82, 255, 0.45), transparent 55%),
    radial-gradient(700px 420px at 95% 5%, rgba(0, 212, 255, 0.28), transparent 50%),
    linear-gradient(165deg, #07070d 0%, #0c0c14 45%, #090912 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
}

.auth-shell {
  width: 100%;
  max-width: 420px;
}

.auth-brand {
  text-align: center;
  margin-bottom: 1.75rem;
}

/* Logo — koyu modda beyaz, açık modda siyah (site.css ile aynı mantık) */
.auth-brand .app-logo {
  width: 100%;
  max-width: 220px;
  margin: 0 auto;
  height: auto;
  object-fit: contain;
}

.auth-brand .app-logo--light {
  display: none;
}

.auth-brand .app-logo--dark {
  display: block;
}

[data-theme="light"] .auth-brand .app-logo--light {
  display: block;
}

[data-theme="light"] .auth-brand .app-logo--dark {
  display: none;
}

.auth-brand h1 {
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin: 1rem 0 0.35rem;
}

.auth-brand p {
  margin: 0;
  color: var(--auth-muted);
  font-size: 0.95rem;
}

.auth-card {
  background: var(--auth-surface);
  border: 1px solid var(--auth-border);
  border-radius: 20px;
  padding: 2rem 1.75rem;
  backdrop-filter: blur(16px);
  box-shadow: 0 24px 64px rgba(0, 0, 0, 0.45);
}

.auth-card .form-label {
  color: var(--auth-muted);
  font-size: 0.85rem;
  font-weight: 500;
}

.auth-card .form-control {
  background-color: rgba(0, 0, 0, 0.35);
  border: 1px solid var(--auth-border);
  color: var(--auth-text);
  border-radius: 12px;
  padding: 0.65rem 0.9rem;
}

.auth-card .form-control:focus {
  background-color: rgba(0, 0, 0, 0.45);
  border-color: rgba(140, 82, 255, 0.65);
  color: var(--auth-text);
  box-shadow: 0 0 0 3px rgba(140, 82, 255, 0.22);
}

[data-theme="light"] .auth-card .form-control {
  background-color: #f8fafc;
  color: var(--auth-text);
}

[data-theme="light"] .auth-card .form-control:focus {
  background-color: #fff;
  color: var(--auth-text);
}

.auth-card .form-check-label {
  color: var(--auth-muted);
  font-size: 0.9rem;
}

.auth-btn {
  width: 100%;
  border: 0;
  border-radius: 12px;
  padding: 0.75rem 1rem;
  font-weight: 600;
  color: #fff;
  background: linear-gradient(90deg, var(--auth-primary), var(--auth-accent));
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.auth-btn:hover {
  color: #fff;
  transform: translateY(-1px);
  box-shadow: 0 12px 28px rgba(140, 82, 255, 0.35);
}

.auth-footer {
  text-align: center;
  margin-top: 1.5rem;
  color: var(--auth-muted);
  font-size: 0.8rem;
}

.auth-validation-summary {
  background: rgba(220, 53, 69, 0.12);
  border: 1px solid rgba(220, 53, 69, 0.35);
  border-radius: 12px;
  padding: 0.75rem 1rem;
  margin-bottom: 1rem;
  font-size: 0.9rem;
}

.auth-validation-summary ul {
  margin: 0;
  padding-left: 1.1rem;
}