/* ==========================================================================
   Landing Page Styles
   ========================================================================== */

.landing {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  background: var(--color-bg);
  color: var(--color-text);
}

/* --------------------------------------------------------------------------
   Header
   -------------------------------------------------------------------------- */

.landing__header {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  padding: var(--space-md) var(--space-lg);
  position: sticky;
  top: 0;
  z-index: 100;
}

.landing__header-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: 1200px;
  margin: 0 auto;
}

.landing__logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-text);
  text-decoration: none;
}

.landing__logo:hover {
  color: var(--color-primary);
  text-decoration: none;
}

.landing__nav {
  display: flex;
  gap: var(--space-lg);
  align-items: center;
}

.landing__nav-link {
  color: var(--color-text-secondary);
  text-decoration: none;
  font-weight: 500;
  transition: color var(--transition-fast);
}

.landing__nav-link:hover {
  color: var(--color-primary);
  text-decoration: none;
}

.landing__nav-link--active {
  color: var(--color-primary);
}

.landing__nav-link--signin {
  background: var(--color-primary);
  color: var(--color-text-inverse);
  padding: var(--space-sm) var(--space-lg);
  border-radius: var(--radius-md);
}

.landing__nav-link--signin:hover {
  background: var(--color-primary-hover);
  color: var(--color-text-inverse);
}

/* --------------------------------------------------------------------------
   Main Content
   -------------------------------------------------------------------------- */

.landing__main {
  flex: 1;
  padding: var(--space-xl) var(--space-lg);
  max-width: 1200px;
  margin: 0 auto;
  width: 100%;
}

.landing__main--narrow {
  max-width: 800px;
}

.landing__main--centered {
  display: flex;
  align-items: center;
  justify-content: center;
  max-width: 500px;
}

/* --------------------------------------------------------------------------
   Hero Section
   -------------------------------------------------------------------------- */

.landing__hero {
  text-align: center;
  padding: var(--space-xl) 0;
  margin-bottom: var(--space-xl);
}

.landing__title {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: var(--space-lg);
  color: var(--color-text);
}

@media (min-width: 768px) {
  .landing__title {
    font-size: 3.5rem;
  }
}

.landing__tagline {
  font-size: 1.25rem;
  color: var(--color-text-muted);
  max-width: 600px;
  margin: 0 auto var(--space-xl);
  line-height: 1.6;
}

.landing__cta {
  display: flex;
  gap: var(--space-lg);
  justify-content: center;
  flex-wrap: wrap;
}

/* --------------------------------------------------------------------------
   Buttons
   -------------------------------------------------------------------------- */

.landing__button {
  display: inline-block;
  padding: var(--space-md) var(--space-xl);
  border-radius: var(--radius-md);
  font-weight: 600;
  text-decoration: none;
  transition: all var(--transition-fast);
  cursor: pointer;
  border: none;
  font-size: 1rem;
}

.landing__button--primary {
  background: var(--color-primary);
  color: var(--color-text-inverse);
}

.landing__button--primary:hover {
  background: var(--color-primary-hover);
  text-decoration: none;
}

.landing__button--secondary {
  background: transparent;
  color: var(--color-primary);
  border: 2px solid var(--color-primary);
}

.landing__button--secondary:hover {
  background: var(--color-primary-subtle);
  text-decoration: none;
}

.landing__button--full {
  width: 100%;
  text-align: center;
}

/* --------------------------------------------------------------------------
   Features Section
   -------------------------------------------------------------------------- */

.landing__features {
  padding: var(--space-xl) 0;
  margin-bottom: var(--space-xl);
}

.landing__section-title {
  font-size: 1.75rem;
  font-weight: 700;
  text-align: center;
  margin-bottom: var(--space-xl);
  color: var(--color-text);
}

.landing__features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-xl);
}

.landing__feature {
  background: var(--color-surface);
  padding: var(--space-xl);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
}

.landing__feature h3 {
  font-size: 1.25rem;
  margin-bottom: var(--space-md);
  color: var(--color-primary);
}

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

/* --------------------------------------------------------------------------
   About Preview Section
   -------------------------------------------------------------------------- */

.landing__about-preview {
  background: var(--color-surface);
  padding: var(--space-xl);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  text-align: center;
}

.landing__about-preview p {
  color: var(--color-text-muted);
  line-height: 1.8;
  max-width: 700px;
  margin: 0 auto var(--space-lg);
}

.landing__about-preview p:last-child {
  margin-bottom: 0;
}

/* --------------------------------------------------------------------------
   Article Pages (About, Privacy)
   -------------------------------------------------------------------------- */

.landing__article {
  background: var(--color-surface);
  padding: var(--space-xl);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
}

.landing__article h1 {
  font-size: 2rem;
  margin-bottom: var(--space-lg);
  color: var(--color-text);
}

.landing__article h2 {
  font-size: 1.5rem;
  margin: var(--space-xl) 0 var(--space-md);
  color: var(--color-text);
}

.landing__article h2:first-of-type {
  margin-top: 0;
}

.landing__article h3 {
  font-size: 1.125rem;
  margin: var(--space-lg) 0 var(--space-sm);
  color: var(--color-text-secondary);
}

.landing__article p {
  color: var(--color-text-muted);
  line-height: 1.8;
  margin-bottom: var(--space-lg);
}

.landing__article ul {
  color: var(--color-text-muted);
  line-height: 1.8;
  margin-bottom: var(--space-lg);
  padding-left: var(--space-xl);
}

.landing__article li {
  margin-bottom: var(--space-sm);
}

.landing__article a {
  color: var(--color-primary);
}

.landing__article a:hover {
  color: var(--color-primary-hover);
}

.landing__date {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  font-style: italic;
  margin-bottom: var(--space-xl);
}

/* --------------------------------------------------------------------------
   Form Styles (Sign Up)
   -------------------------------------------------------------------------- */

.landing__form-container {
  background: var(--color-surface);
  padding: var(--space-xl);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  width: 100%;
}

.landing__form-container h1 {
  font-size: 1.75rem;
  margin-bottom: var(--space-sm);
  text-align: center;
}

.landing__form-subtitle {
  color: var(--color-text-muted);
  text-align: center;
  margin-bottom: var(--space-xl);
}

.landing__form {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.landing__form-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.landing__form-group label {
  font-weight: 500;
  color: var(--color-text-secondary);
}

.landing__form-group input[type="text"],
.landing__form-group input[type="email"],
.landing__form-group input[type="password"] {
  padding: var(--space-md);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: 1rem;
  background: var(--color-bg);
  color: var(--color-text);
  transition: border-color var(--transition-fast);
}

.landing__form-group input:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-subtle);
}

.landing__form-group--checkbox {
  flex-direction: row;
  align-items: center;
}

.landing__form-group--checkbox input[type="checkbox"] {
  width: 18px;
  height: 18px;
  accent-color: var(--color-primary);
}

.landing__form-group--checkbox label {
  font-weight: 400;
}

.landing__form-footer {
  text-align: center;
  margin-top: var(--space-lg);
  color: var(--color-text-muted);
}

.landing__form-footer a {
  color: var(--color-primary);
  font-weight: 500;
}

/* --------------------------------------------------------------------------
   Footer
   -------------------------------------------------------------------------- */

.landing__footer {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  padding: var(--space-lg);
  margin-top: auto;
}

.landing__footer-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-md);
  max-width: 1200px;
  margin: 0 auto;
}

@media (min-width: 768px) {
  .landing__footer-content {
    flex-direction: row;
    justify-content: space-between;
  }
}

.landing__footer p {
  margin: 0;
  color: var(--color-text-muted);
  font-size: 0.9rem;
}

.landing__footer-nav {
  display: flex;
  gap: var(--space-lg);
}

.landing__footer-nav a {
  color: var(--color-text-muted);
  font-size: 0.9rem;
  text-decoration: none;
}

.landing__footer-nav a:hover {
  color: var(--color-primary);
}

/* --------------------------------------------------------------------------
   Responsive
   -------------------------------------------------------------------------- */

@media (max-width: 640px) {
  .landing__header-content {
    flex-direction: column;
    gap: var(--space-md);
  }

  .landing__nav {
    gap: var(--space-md);
  }

  .landing__hero {
    padding: var(--space-lg) 0;
  }

  .landing__title {
    font-size: 2rem;
  }

  .landing__tagline {
    font-size: 1.1rem;
  }
}

/* --------------------------------------------------------------------------
   SSO / Federated Sign-In Styles
   -------------------------------------------------------------------------- */

.landing__sso-buttons {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  margin-bottom: var(--space-lg);
}

.landing__sso-button {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-md);
  width: 100%;
  padding: var(--space-md) var(--space-lg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface);
  color: var(--color-text);
  font-size: 1rem;
  font-weight: 500;
  cursor: pointer;
  transition: background-color var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.landing__sso-button:hover:not(:disabled) {
  background: var(--color-bg);
  border-color: var(--color-text-muted);
}

.landing__sso-button:focus {
  outline: none;
  box-shadow: 0 0 0 3px var(--color-primary-subtle);
  border-color: var(--color-primary);
}

.landing__sso-button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.landing__sso-icon {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
}

.landing__sso-button--microsoft:hover:not(:disabled) {
  border-color: #00a4ef;
}

.landing__sso-button--google:hover:not(:disabled) {
  border-color: #4285F4;
}

.landing__sso-button--apple:hover:not(:disabled) {
  border-color: var(--color-text);
}

.landing__sso-divider {
  display: flex;
  align-items: center;
  margin: var(--space-lg) 0;
  color: var(--color-text-muted);
  font-size: 0.875rem;
}

.landing__sso-divider::before,
.landing__sso-divider::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--color-border);
}

.landing__sso-divider span {
  padding: 0 var(--space-md);
}

.landing__sso-info {
  text-align: center;
  color: var(--color-text-muted);
  font-size: 0.875rem;
  line-height: 1.6;
  margin-bottom: var(--space-lg);
}

/* Alert styles */
.landing__alert {
  padding: var(--space-md);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-lg);
  font-size: 0.9rem;
}

.landing__alert--error {
  background: var(--color-danger-bg, rgba(239, 68, 68, 0.1));
  border: 1px solid var(--color-danger-border, rgba(239, 68, 68, 0.3));
  color: var(--color-danger, #dc2626);
}

.landing__alert--success {
  background: var(--color-success-bg, rgba(16, 185, 129, 0.1));
  border: 1px solid var(--color-success-border, rgba(16, 185, 129, 0.3));
  color: var(--color-success, #059669);
}

.landing__alert--info {
  background: var(--color-info-bg, rgba(59, 130, 246, 0.1));
  border: 1px solid var(--color-info-border, rgba(59, 130, 246, 0.3));
  color: var(--color-info, #3b82f6);
}