/**
 * Reusable UI Components
 * For privacy, AI, trust, and security themed applications
 */

/* === Container and Layout === */
.container {
  width: 100%;
  max-width: var(--max-width-7xl);
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

.container-narrow {
  max-width: var(--max-width-4xl);
}

.container-wide {
  max-width: var(--max-width-full);
}

/* === Hero Section === */
.hero {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 60vh;
  padding: var(--spacing-4xl) var(--spacing-lg);
  text-align: center;
  overflow: hidden;
}

.hero__content {
  position: relative;
  z-index: 1;
  max-width: var(--max-width-4xl);
  margin: 0 auto;
}

.hero__icon {
  font-size: 4rem;
  margin-bottom: var(--spacing-lg);
  line-height: 1;
}

.hero__title {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: var(--font-bold);
  line-height: var(--leading-tight);
  margin-bottom: var(--spacing-md);
}

.hero__subtitle {
  font-size: clamp(1.125rem, 3vw, 1.5rem);
  line-height: var(--leading-relaxed);
  color: var(--text-secondary);
  margin-bottom: var(--spacing-xl);
}

.hero__actions {
  display: flex;
  gap: var(--spacing-md);
  justify-content: center;
  flex-wrap: wrap;
}

/* Hero Theme Variants */
.hero--privacy {
  background: linear-gradient(135deg, var(--privacy-primary) 0%, var(--privacy-secondary) 100%);
  color: var(--text-inverse);
}

.hero--privacy .hero__subtitle {
  color: rgba(255, 255, 255, 0.9);
}

.hero--ai {
  background: linear-gradient(135deg, var(--ai-primary) 0%, var(--ai-secondary) 100%);
  color: var(--text-inverse);
}

.hero--ai .hero__subtitle {
  color: rgba(255, 255, 255, 0.9);
}

.hero--trust {
  background: linear-gradient(135deg, var(--trust-primary) 0%, var(--trust-secondary) 100%);
  color: var(--text-inverse);
}

.hero--trust .hero__subtitle {
  color: rgba(255, 255, 255, 0.9);
}

.hero--security {
  background: linear-gradient(135deg, var(--neutral-900) 0%, var(--neutral-800) 100%);
  color: var(--text-inverse);
}

.hero--security .hero__subtitle {
  color: rgba(255, 255, 255, 0.9);
}

/* === Buttons === */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-sm) var(--spacing-lg);
  font-size: var(--text-base);
  font-weight: var(--font-medium);
  line-height: var(--leading-normal);
  text-align: center;
  text-decoration: none;
  white-space: nowrap;
  vertical-align: middle;
  cursor: pointer;
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  user-select: none;
}

.btn:focus {
  outline: 2px solid var(--border-focus);
  outline-offset: var(--focus-ring-offset);
}

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

/* Button Variants */
.btn-primary {
  background-color: var(--brand-primary);
  color: var(--text-inverse);
}

.btn-primary:hover:not(:disabled) {
  background-color: var(--brand-secondary);
}

.btn-secondary {
  background-color: var(--neutral-200);
  color: var(--text-primary);
}

.btn-secondary:hover:not(:disabled) {
  background-color: var(--neutral-300);
}

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

.btn-trust:hover:not(:disabled) {
  background-color: var(--trust-secondary);
}

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

.btn-security:hover:not(:disabled) {
  background-color: var(--security-secondary);
}

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

.btn-privacy:hover:not(:disabled) {
  background-color: var(--privacy-secondary);
}

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

.btn-ai:hover:not(:disabled) {
  background-color: var(--ai-secondary);
}

.btn-outline {
  background-color: transparent;
  border-color: var(--border-primary);
  color: var(--text-primary);
}

.btn-outline:hover:not(:disabled) {
  background-color: var(--bg-secondary);
}

/* Button Sizes */
.btn-sm {
  padding: var(--spacing-xs) var(--spacing-md);
  font-size: var(--text-sm);
}

.btn-lg {
  padding: var(--spacing-md) var(--spacing-xl);
  font-size: var(--text-lg);
}

/* === Cards === */
.card {
  background-color: var(--bg-primary);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  transition: box-shadow var(--transition-fast);
}

.card:hover {
  box-shadow: var(--shadow-md);
}

.card-header {
  padding: var(--spacing-lg);
  border-bottom: 1px solid var(--border-primary);
  background-color: var(--bg-secondary);
}

.card-body {
  padding: var(--spacing-lg);
}

.card-footer {
  padding: var(--spacing-lg);
  border-top: 1px solid var(--border-primary);
  background-color: var(--bg-secondary);
}

/* Card Variants */
.card-privacy {
  border-color: var(--privacy-primary);
  border-width: 2px;
}

.card-privacy .card-header {
  background-color: var(--privacy-light);
}

.card-ai {
  border-color: var(--ai-primary);
  border-width: 2px;
}

.card-ai .card-header {
  background-color: var(--ai-light);
}

.card-trust {
  border-color: var(--trust-primary);
  border-width: 2px;
}

.card-trust .card-header {
  background-color: var(--trust-light);
}

.card-security {
  border-color: var(--security-primary);
  border-width: 2px;
}

.card-security .card-header {
  background-color: var(--security-light);
}

/* === Forms === */
.form-group {
  margin-bottom: var(--spacing-lg);
}

.form-label {
  display: block;
  margin-bottom: var(--spacing-sm);
  font-weight: var(--font-medium);
  color: var(--text-primary);
}

.form-input,
.form-textarea,
.form-select {
  display: block;
  width: 100%;
  padding: var(--spacing-sm) var(--spacing-md);
  font-size: var(--text-base);
  line-height: var(--leading-normal);
  color: var(--text-primary);
  background-color: var(--bg-primary);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-md);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-input:focus,
.form-textarea:focus,
.form-select:focus {
  outline: none;
  border-color: var(--border-focus);
  box-shadow: var(--focus-ring);
}

.form-input:disabled,
.form-textarea:disabled,
.form-select:disabled {
  background-color: var(--bg-secondary);
  opacity: 0.6;
  cursor: not-allowed;
}

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

.form-textarea {
  min-height: 120px;
}

.form-help {
  display: block;
  margin-top: var(--spacing-xs);
  font-size: var(--text-sm);
  color: var(--text-secondary);
}

.form-error {
  display: block;
  margin-top: var(--spacing-xs);
  font-size: var(--text-sm);
  color: var(--security-primary);
}

.form-checkbox,
.form-radio {
  width: 1rem;
  height: 1rem;
  margin-right: var(--spacing-sm);
  vertical-align: middle;
  cursor: pointer;
}

/* === Badges === */
.badge {
  display: inline-flex;
  align-items: center;
  padding: var(--spacing-xs) var(--spacing-sm);
  font-size: var(--text-xs);
  font-weight: var(--font-medium);
  line-height: 1;
  border-radius: var(--radius-full);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.badge-privacy {
  background-color: var(--privacy-light);
  color: var(--privacy-dark);
}

.badge-ai {
  background-color: var(--ai-light);
  color: var(--ai-dark);
}

.badge-trust {
  background-color: var(--trust-light);
  color: var(--trust-dark);
}

.badge-security {
  background-color: var(--security-light);
  color: var(--security-dark);
}

.badge-safe {
  background-color: var(--trust-light);
  color: var(--trust-dark);
}

.badge-warning {
  background-color: #fef3c7;
  color: #92400e;
}

/* === Alerts === */
.alert {
  padding: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
  border: 1px solid transparent;
  border-radius: var(--radius-md);
}

.alert-info {
  background-color: var(--ai-light);
  border-color: var(--ai-primary);
  color: var(--ai-dark);
}

.alert-success {
  background-color: var(--trust-light);
  border-color: var(--trust-primary);
  color: var(--trust-dark);
}

.alert-warning {
  background-color: #fef3c7;
  border-color: #f59e0b;
  color: #92400e;
}

.alert-error {
  background-color: var(--security-light);
  border-color: var(--security-primary);
  color: var(--security-dark);
}

/* === Navigation === */
.nav {
  display: flex;
  flex-wrap: wrap;
  padding-left: 0;
  margin-bottom: 0;
  list-style: none;
}

.nav-link {
  display: block;
  padding: var(--spacing-sm) var(--spacing-md);
  color: var(--text-secondary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

.nav-link.active {
  color: var(--brand-primary);
  font-weight: var(--font-medium);
}

/* === Modal === */
.modal-backdrop {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: var(--bg-overlay);
  z-index: var(--z-modal-backdrop);
}

.modal {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 90%;
  max-width: var(--max-width-lg);
  max-height: 90vh;
  overflow-y: auto;
  background-color: var(--bg-primary);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-2xl);
  z-index: var(--z-modal);
}

.modal-header {
  padding: var(--spacing-lg);
  border-bottom: 1px solid var(--border-primary);
}

.modal-body {
  padding: var(--spacing-lg);
}

.modal-footer {
  padding: var(--spacing-lg);
  border-top: 1px solid var(--border-primary);
  display: flex;
  justify-content: flex-end;
  gap: var(--spacing-sm);
}

/* === Loading Spinner === */
.spinner {
  display: inline-block;
  width: 2rem;
  height: 2rem;
  border: 3px solid var(--border-primary);
  border-top-color: var(--brand-primary);
  border-radius: var(--radius-full);
  animation: spin 1s linear infinite;
}

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

/* === Progress Bar === */
.progress {
  display: flex;
  height: 1rem;
  overflow: hidden;
  background-color: var(--bg-secondary);
  border-radius: var(--radius-full);
}

.progress-bar {
  display: flex;
  flex-direction: column;
  justify-content: center;
  overflow: hidden;
  color: var(--text-inverse);
  text-align: center;
  white-space: nowrap;
  background-color: var(--brand-primary);
  transition: width var(--transition-slow);
}

/* === Tooltips === */
.tooltip {
  position: absolute;
  padding: var(--spacing-xs) var(--spacing-sm);
  font-size: var(--text-sm);
  color: var(--text-inverse);
  background-color: var(--neutral-800);
  border-radius: var(--radius-md);
  z-index: var(--z-tooltip);
  white-space: nowrap;
}

/* === Section Styles === */
.section {
  padding: var(--spacing-4xl) 0;
}

.section--gray {
  background-color: var(--bg-secondary);
}

.section--dark {
  background-color: var(--bg-dark);
  color: var(--text-inverse);
}

.section__header {
  text-align: center;
  margin-bottom: var(--spacing-3xl);
  max-width: var(--max-width-3xl);
  margin-left: auto;
  margin-right: auto;
}

.section__title {
  font-size: clamp(1.875rem, 4vw, 2.5rem);
  font-weight: var(--font-bold);
  margin-bottom: var(--spacing-md);
  line-height: var(--leading-tight);
}

.section__subtitle {
  font-size: var(--text-lg);
  color: var(--text-secondary);
  line-height: var(--leading-relaxed);
}

.section--dark .section__subtitle {
  color: var(--neutral-300);
}

/* === Grid System === */
.grid {
  display: grid;
  gap: var(--spacing-xl);
}

.grid--2 {
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.grid--3 {
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.grid--4 {
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

@media (max-width: 768px) {
  .grid--2,
  .grid--3,
  .grid--4 {
    grid-template-columns: 1fr;
  }
}

/* === Feature Cards === */
.feature {
  text-align: center;
  padding: var(--spacing-xl);
}

.feature__icon {
  font-size: 3rem;
  margin-bottom: var(--spacing-md);
  line-height: 1;
}

.feature__title {
  font-size: var(--text-xl);
  font-weight: var(--font-semibold);
  margin-bottom: var(--spacing-sm);
}

.feature__description {
  color: var(--text-secondary);
  line-height: var(--leading-relaxed);
}

/* === Header & Navigation === */
.header {
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
  background-color: var(--bg-primary);
  border-bottom: 1px solid var(--border-primary);
  box-shadow: var(--shadow-sm);
}

.navbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-md) 0;
}

.navbar__brand {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  font-size: var(--text-xl);
  font-weight: var(--font-bold);
  text-decoration: none;
  color: var(--text-primary);
}

.navbar__logo {
  height: 40px;
  width: auto;
}

.navbar__nav {
  display: flex;
  gap: var(--spacing-lg);
  list-style: none;
  margin: 0;
  padding: 0;
}

.navbar__link {
  text-decoration: none;
  color: var(--text-secondary);
  font-weight: var(--font-medium);
  transition: color var(--transition-fast);
  padding: var(--spacing-sm) 0;
}

.navbar__link:hover,
.navbar__link--active {
  color: var(--text-primary);
}

.navbar__toggle {
  display: none;
  flex-direction: column;
  gap: 4px;
  background: none;
  border: none;
  padding: var(--spacing-sm);
  cursor: pointer;
}

.navbar__toggle-bar {
  width: 24px;
  height: 2px;
  background-color: var(--text-primary);
  transition: all var(--transition-fast);
}

@media (max-width: 768px) {
  .navbar__nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background-color: var(--bg-primary);
    border-bottom: 1px solid var(--border-primary);
    flex-direction: column;
    padding: var(--spacing-md);
    box-shadow: var(--shadow-md);
  }
  
  .navbar__nav--active {
    display: flex;
  }
  
  .navbar__toggle {
    display: flex;
  }
}

/* === Footer === */
.footer {
  background: linear-gradient(180deg, var(--neutral-800) 0%, var(--neutral-900) 100%);
  color: var(--neutral-300);
  padding: var(--spacing-4xl) 0 var(--spacing-xl);
  
  /* Dark mode footer gradient (single source of truth) */
  --footer-bg-dark: linear-gradient(180deg, #1e293b 0%, #0f172a 100%);
}

/* Dark mode footer - even darker */
@media (prefers-color-scheme: dark) {
  .footer {
    background: var(--footer-bg-dark);
  }
}

html.dark .footer,
html.dark-mode .footer,
html[data-theme="dark"] .footer {
  background: var(--footer-bg-dark);
}

.footer__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--spacing-2xl);
  margin-bottom: var(--spacing-2xl);
}

.footer__section {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.footer__title {
  font-size: var(--text-lg);
  font-weight: var(--font-semibold);
  color: var(--neutral-50);
  margin-bottom: var(--spacing-sm);
}

.footer__links {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.footer__link {
  color: var(--neutral-300);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.footer__link:hover {
  color: var(--neutral-50);
}

.footer__copyright {
  text-align: center;
  padding-top: var(--spacing-xl);
  border-top: 1px solid var(--neutral-700);
  color: var(--neutral-400);
}

/* === Cross-site Navigation === */
.cross-site-nav {
  background-color: var(--neutral-100);
  border-bottom: 1px solid var(--border-primary);
  padding: var(--spacing-xs) 0;
}

.cross-site-nav__container {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-md);
  flex-wrap: wrap;
}

.cross-site-nav__label {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  font-weight: var(--font-medium);
}

.cross-site-nav__link {
  font-size: var(--text-sm);
  color: var(--text-primary);
  text-decoration: none;
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius-md);
  transition: background-color var(--transition-fast);
}

.cross-site-nav__link:hover {
  background-color: var(--neutral-200);
}

/* === Article/Blog Styles === */
.article {
  max-width: var(--max-width-3xl);
  margin: 0 auto;
}

.article__header {
  text-align: center;
  margin-bottom: var(--spacing-3xl);
}

.article__title {
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: var(--font-bold);
  line-height: var(--leading-tight);
  margin-bottom: var(--spacing-md);
}

.article__meta {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-md);
  color: var(--text-secondary);
  font-size: var(--text-sm);
}

.article__content {
  font-size: var(--text-lg);
  line-height: var(--leading-relaxed);
}

.article__content h2 {
  font-size: var(--text-2xl);
  font-weight: var(--font-bold);
  margin-top: var(--spacing-3xl);
  margin-bottom: var(--spacing-lg);
}

.article__content h3 {
  font-size: var(--text-xl);
  font-weight: var(--font-semibold);
  margin-top: var(--spacing-2xl);
  margin-bottom: var(--spacing-md);
}

.article__content p {
  margin-bottom: var(--spacing-lg);
}

.article__content ul,
.article__content ol {
  margin-bottom: var(--spacing-lg);
  padding-left: var(--spacing-xl);
}

.article__content li {
  margin-bottom: var(--spacing-sm);
}

.article__content blockquote {
  border-left: 4px solid var(--border-primary);
  padding-left: var(--spacing-lg);
  margin: var(--spacing-xl) 0;
  font-style: italic;
  color: var(--text-secondary);
}

.article__content code {
  background-color: var(--bg-secondary);
  padding: 0.2em 0.4em;
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 0.875em;
}

.article__content pre {
  background-color: var(--neutral-900);
  color: var(--neutral-50);
  padding: var(--spacing-lg);
  border-radius: var(--radius-lg);
  overflow-x: auto;
  margin-bottom: var(--spacing-lg);
}

.article__content pre code {
  background: none;
  padding: 0;
  color: inherit;
}