/* ═══════════════════════════════════════════════════════════════
   auth.css — Sign In / Sign Up Page
═══════════════════════════════════════════════════════════════ */

.auth-page {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--space-xl) var(--space-md);
}

/* Back link */
.auth-back {
  position: absolute;
  top: var(--space-lg);
  left: var(--space-lg);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: var(--size-sm);
  font-weight: 600;
  color: var(--text-secondary);
}

.auth-back:hover { color: var(--text-primary); }
.auth-back svg { width: 16px; height: 16px; }

/* Card */
.auth-card {
  width: 100%;
  max-width: 420px;
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--space-2xl);
  box-shadow: var(--shadow-lg);
  transition: background var(--duration-med) var(--ease),
              border-color var(--duration-med) var(--ease);
}

.auth-card__brand {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  font-family: var(--font-display);
  font-size: var(--size-xl);
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: var(--space-xs);
  text-decoration: none;
  letter-spacing: -.03em;
}

.auth-card__brand-icon {
  width: 32px;
  height: 32px;
  background: var(--accent);
  border-radius: var(--radius-sm);
  display: grid;
  place-items: center;
  color: #fff;
}

.auth-card__brand-icon svg { width: 18px; height: 18px; }

.auth-card__heading {
  text-align: center;
  font-family: var(--font-display);
  font-size: var(--size-2xl);
  font-weight: 700;
  margin-bottom: var(--space-2xs);
}

.auth-card__subheading {
  text-align: center;
  font-size: var(--size-sm);
  color: var(--text-tertiary);
  margin-bottom: var(--space-xl);
}

/* Form elements */
.form-group { margin-bottom: var(--space-md); }

.form-label {
  display: block;
  font-size: var(--size-sm);
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: var(--space-2xs);
}

.form-input {
  width: 100%;
  padding: 12px 16px;
  font-size: var(--size-base);
  color: var(--text-primary);
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  outline: none;
  transition: border-color var(--duration-fast) var(--ease),
              box-shadow var(--duration-fast) var(--ease),
              background var(--duration-med) var(--ease);
}

.form-input::placeholder { color: var(--text-tertiary); }

.form-input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}

/* Name field — slides in for sign-up mode */
.form-group--name {
  display: none;
  opacity: 0;
  max-height: 0;
  overflow: hidden;
  transition: opacity var(--duration-med) var(--ease),
              max-height var(--duration-med) var(--ease),
              margin var(--duration-med) var(--ease);
}

.form-group--name.show {
  display: block;
  opacity: 1;
  max-height: 120px;
  margin-bottom: var(--space-md);
}

.auth-submit { width: 100%; margin-top: var(--space-lg); }

/* Mode toggle */
.auth-toggle {
  text-align: center;
  margin-top: var(--space-lg);
  font-size: var(--size-sm);
  color: var(--text-tertiary);
}

.auth-toggle__link {
  font-weight: 700;
  color: var(--accent);
  cursor: pointer;
  background: none;
  border: none;
  text-decoration: underline;
  text-decoration-color: transparent;
  transition: text-decoration-color var(--duration-fast) var(--ease);
}

.auth-toggle__link:hover { text-decoration-color: var(--accent); }

/* Feedback messages */
.auth-message {
  margin-top: var(--space-md);
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  font-size: var(--size-sm);
  text-align: center;
  display: none;
}

.auth-message--error {
  display: block;
  background: #fef2f2;
  color: #b91c1c;
  border: 1px solid #fecaca;
}

[data-theme="dark"] .auth-message--error {
  background: #2d1515;
  color: #fca5a5;
  border-color: #4a1c1c;
}

.auth-message--success {
  display: block;
  background: var(--accent-light);
  color: var(--accent);
  border: 1px solid var(--accent-soft);
}

/* Theme toggle position */
.auth-theme-toggle {
  position: absolute;
  top: var(--space-lg);
  right: var(--space-lg);
}

.auth-footer {
  margin-top: var(--space-xl);
  text-align: center;
}

.auth-footer a {
  font-size: var(--size-xs);
  color: var(--text-tertiary);
}

.auth-footer a:hover { color: var(--text-primary); }