/* ─── Auth Pages Styles ─── Studio Archive ─── */

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --color-bg: #fafafa;
  --color-surface: #ffffff;
  --color-text: #0a0a0a;
  --color-text-muted: #6b7280;
  --color-border: #e5e7eb;
  --color-primary: #0a0a0a;
  --color-primary-hover: #262626;
  --color-error: #dc2626;
  --color-error-bg: #fef2f2;
  --radius: 8px;
  --shadow: 0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.06);
  --shadow-lg: 0 4px 12px rgba(0,0,0,0.08), 0 2px 4px rgba(0,0,0,0.04);
  --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

body {
  font-family: var(--font);
  background: var(--color-bg);
  color: var(--color-text);
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.auth-container {
  width: 100%;
  max-width: 420px;
  padding: 1.5rem;
}

.auth-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 2.5rem 2rem;
  box-shadow: var(--shadow);
}

.auth-logo {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  margin-bottom: 1.75rem;
}

.auth-title {
  font-size: 1.5rem;
  font-weight: 600;
  line-height: 1.2;
  margin-bottom: 0.5rem;
}

.auth-subtitle {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  line-height: 1.5;
  margin-bottom: 2rem;
}

/* ─── Form ─── */

.form-group {
  margin-bottom: 1.25rem;
}

.form-label {
  display: block;
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--color-text);
  margin-bottom: 0.375rem;
}

.form-input {
  width: 100%;
  padding: 0.625rem 0.75rem;
  font-size: 0.875rem;
  font-family: var(--font);
  color: var(--color-text);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  outline: none;
  transition: border-color 0.15s, box-shadow 0.15s;
}

.form-input:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(10, 10, 10, 0.08);
}

.form-input::placeholder {
  color: #9ca3af;
}

.form-input:disabled {
  background: #f3f4f6;
  color: var(--color-text-muted);
  cursor: not-allowed;
}

/* ─── Checkbox ─── */

.form-checkbox-group {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
}

.form-checkbox {
  width: 1rem;
  height: 1rem;
  accent-color: var(--color-primary);
  cursor: pointer;
}

.form-checkbox-label {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  cursor: pointer;
  user-select: none;
}

/* ─── Button ─── */

.btn-primary {
  width: 100%;
  padding: 0.6875rem 1rem;
  font-size: 0.875rem;
  font-weight: 500;
  font-family: var(--font);
  color: #ffffff;
  background: var(--color-primary);
  border: 1px solid var(--color-primary);
  border-radius: var(--radius);
  cursor: pointer;
  transition: background 0.15s, transform 0.1s;
}

.btn-primary:hover {
  background: var(--color-primary-hover);
}

.btn-primary:active {
  transform: scale(0.99);
}

.btn-primary:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

/* ─── Error Message ─── */

.form-error {
  background: var(--color-error-bg);
  color: var(--color-error);
  font-size: 0.8125rem;
  padding: 0.625rem 0.75rem;
  border-radius: var(--radius);
  margin-bottom: 1.25rem;
  display: none;
  line-height: 1.4;
}

.form-error.visible {
  display: block;
}

/* ─── Link ─── */

.auth-link {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  text-decoration: none;
  transition: color 0.15s;
}

.auth-link:hover {
  color: var(--color-text);
}

/* ─── Divider ─── */

.auth-divider {
  height: 1px;
  background: var(--color-border);
  margin: 1.5rem 0;
}

/* ─── Footer ─── */

.auth-footer {
  text-align: center;
  margin-top: 1.5rem;
  font-size: 0.8125rem;
  color: var(--color-text-muted);
}

/* ─── Password strength indicator ─── */

.password-hint {
  font-size: 0.75rem;
  color: var(--color-text-muted);
  margin-top: 0.25rem;
}

/* ─── Loading state ─── */

.btn-primary.loading {
  position: relative;
  color: transparent;
}

.btn-primary.loading::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 1rem;
  height: 1rem;
  margin: -0.5rem 0 0 -0.5rem;
  border: 2px solid rgba(255,255,255,0.3);
  border-top-color: #ffffff;
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
}

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

/* ─── Responsive ─── */

@media (max-width: 480px) {
  .auth-container {
    padding: 1rem;
  }

  .auth-card {
    padding: 2rem 1.5rem;
  }
}