/**
 * Components - drep-ai.org
 *
 * Reusable UI components using BEM methodology
 * (Block Element Modifier)
 *
 * Load order: tokens.css → base.css → components.css → main.css
 */

/* ============================================
   BUTTONS
   ============================================ */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  font-family: var(--font-primary);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-semibold);
  line-height: 1;
  text-decoration: none;
  border-radius: var(--radius-md);
  border: var(--border-width-medium) solid transparent;
  cursor: pointer;
  transition: var(--transition-colors), var(--transition-transform);
  white-space: nowrap;
  user-select: none;
  min-height: 44px; /* WCAG touch target */
}

.btn:focus-visible {
  outline: var(--border-width-medium) solid var(--color-border-focus);
  outline-offset: 2px;
}

.btn:active {
  transform: translateY(1px);
}

/* Primary button */
.btn--primary {
  background-color: var(--color-primary-dark);
  color: var(--color-text-inverse);
  border-color: var(--color-primary-dark);
}

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

/* Secondary button */
.btn--secondary {
  background-color: transparent;
  color: var(--color-primary);
  border-color: var(--color-primary);
}

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

/* Tertiary button (ghost) */
.btn--tertiary {
  background-color: transparent;
  color: var(--color-text-primary);
  border-color: var(--color-border-base);
}

.btn--tertiary:hover {
  background-color: var(--color-bg-base);
  border-color: var(--color-border-strong);
}

/* Button sizes */
.btn--sm {
  padding: var(--space-2) var(--space-4);
  font-size: var(--font-size-sm);
  min-height: 36px;
}

.btn--lg {
  padding: var(--space-4) var(--space-8);
  font-size: var(--font-size-lg);
  min-height: 52px;
}

/* Disabled button */
.btn:disabled,
.btn--disabled {
  opacity: 0.5;
  cursor: not-allowed;
  pointer-events: none;
}


/* ============================================
   CARDS
   ============================================ */

.card {
  background-color: var(--color-bg-surface);
  border-radius: var(--radius-lg);
  padding: var(--space-card-padding);
  box-shadow: var(--shadow-md);
  transition: var(--transition-base);
  border: var(--border-width-thin) solid var(--color-border-base);
  height: 100%; /* Ensures equal height in grid layouts */
}

.card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}

/* Card header */
.card__header {
  margin-bottom: var(--space-4);
}

.card__icon {
  width: 48px;
  height: 48px;
  margin-bottom: var(--space-3);
  color: var(--color-primary);
}

.card__title {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--space-2);
  color: var(--color-text-primary);
  font-family: var(--font-primary);
}

.card__description {
  color: var(--color-text-secondary);
  line-height: var(--line-height-relaxed);
  margin-bottom: 0;
}

/* Feature card variant */
.card--feature {
  text-align: center;
  padding: var(--space-8);
}

.card--feature .card__icon {
  margin-left: auto;
  margin-right: auto;
  width: 64px;
  height: 64px;
}

/* Clickable card */
.card--clickable {
  cursor: pointer;
}

.card--clickable:hover {
  border-color: var(--color-primary);
}


/* ============================================
   CODE BLOCKS
   ============================================ */

.code-block {
  position: relative;
  margin-bottom: var(--space-6);
}

.code-block__header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background-color: #2d2d2d;
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-md) var(--radius-md) 0 0;
  border-bottom: var(--border-width-thin) solid #3d3d3d;
}

.code-block__language {
  font-family: var(--font-code);
  font-size: var(--font-size-sm);
  color: #9ca3af;
  text-transform: uppercase;
  letter-spacing: var(--letter-spacing-wide);
}

.code-block__copy {
  padding: var(--space-2) var(--space-3);
  font-size: var(--font-size-sm);
  background-color: transparent;
  color: #9ca3af;
  border: var(--border-width-thin) solid #4b5563;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: var(--transition-colors);
  font-family: var(--font-code);
  min-height: 32px; /* Smaller touch target for desktop-focused action */
}

.code-block__copy:hover {
  background-color: #374151;
  color: #f9fafb;
  border-color: #6b7280;
}

.code-block__copy:active {
  background-color: #4b5563;
}

.code-block__copy--copied {
  background-color: var(--color-success);
  color: var(--color-text-inverse);
  border-color: var(--color-success);
}

.code-block__copy--copied:hover {
  background-color: var(--color-success);
  border-color: var(--color-success);
}

.code-block pre {
  margin-bottom: 0;
  border-radius: 0 0 var(--radius-md) var(--radius-md);
  padding: var(--space-4);
}

/* Code block without header (simple) */
.code-block--simple pre {
  border-radius: var(--radius-md);
}


/* ============================================
   BADGES
   ============================================ */

.badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-1) var(--space-3);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
  line-height: 1;
  border-radius: var(--radius-full);
  text-transform: uppercase;
  letter-spacing: var(--letter-spacing-wide);
}

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

.badge--success {
  background-color: var(--color-success-bg);
  color: var(--color-success);
}

.badge--info {
  background-color: var(--color-info-bg);
  color: var(--color-info);
}

.badge--neutral {
  background-color: var(--color-bg-base);
  color: var(--color-text-secondary);
  border: var(--border-width-thin) solid var(--color-border-base);
}

/* External badge images (GitHub, PyPI) */
.badge-img {
  display: inline-block;
  vertical-align: middle;
  height: 20px;
  transition: opacity var(--duration-base);
}

.badge-img:hover {
  opacity: 0.8;
}


/* ============================================
   NAVIGATION
   ============================================ */

.nav {
  background-color: var(--color-bg-surface);
  border-bottom: var(--border-width-thin) solid var(--color-border-base);
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
  box-shadow: var(--shadow-sm);
}

.nav__container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: var(--space-4);
  padding-bottom: var(--space-4);
}

.nav__brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-family: var(--font-primary);
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-primary);
  text-decoration: none;
}

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

.nav__logo {
  width: 64px;
  height: 64px;
  color: var(--color-primary);
}

.nav__menu {
  display: flex;
  gap: var(--space-6);
  list-style: none;
  padding: 0;
  margin: 0;
}

.nav__link {
  font-family: var(--font-primary);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-secondary);
  text-decoration: none;
  padding: var(--space-2);
  border-radius: var(--radius-sm);
  transition: var(--transition-colors);
  min-height: 44px; /* WCAG touch target */
  display: flex;
  align-items: center;
}

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

.nav__link--active {
  color: var(--color-primary);
  font-weight: var(--font-weight-bold);
}

/* Mobile menu toggle (hidden on desktop) */
.nav__toggle {
  display: none;
  flex-direction: column;
  gap: 4px;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-2);
  min-height: 44px;
  min-width: 44px;
}

.nav__toggle-line {
  width: 24px;
  height: 2px;
  background-color: var(--color-text-primary);
  transition: var(--transition-base);
}

/* Mobile navigation */
@media (max-width: 47.99rem) { /* < 768px */
  .nav__toggle {
    display: flex;
  }

  .nav__menu {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background-color: var(--color-bg-surface);
    flex-direction: column;
    gap: 0;
    padding: var(--space-4);
    border-bottom: var(--border-width-thin) solid var(--color-border-base);
    box-shadow: var(--shadow-lg);
    display: none;
  }

  .nav__menu--open {
    display: flex;
  }

  .nav__link {
    padding: var(--space-3);
    width: 100%;
  }
}


/* ============================================
   FOOTER
   ============================================ */

.footer {
  background-color: var(--color-text-primary);
  color: var(--color-text-inverse);
  padding-top: var(--space-12);
  padding-bottom: var(--space-8);
  margin-top: var(--space-section-lg);
}

.footer__container {
  max-width: var(--container-lg);
  margin: 0 auto;
  padding: 0 var(--space-4);
}

.footer__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-8);
  margin-bottom: var(--space-8);
}

@media (min-width: 48rem) { /* 768px - tablet */
  .footer__grid {
    grid-template-columns: 2fr 1fr 1fr;
  }
}

.footer__section-title {
  font-family: var(--font-primary);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-inverse);
  margin-bottom: var(--space-3);
  text-transform: uppercase;
  letter-spacing: var(--letter-spacing-wide);
}

.footer__links {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.footer__link {
  color: #9ca3af;
  text-decoration: none;
  font-size: var(--font-size-sm);
  transition: var(--transition-colors);
  display: inline-block;
}

.footer__link:hover {
  color: var(--color-text-inverse);
}

.footer__description {
  color: #9ca3af;
  margin-bottom: var(--space-4);
  font-size: var(--font-size-sm);
  line-height: var(--line-height-relaxed);
}

.footer__bottom {
  padding-top: var(--space-6);
  border-top: var(--border-width-thin) solid #374151;
  color: #9ca3af;
  font-size: var(--font-size-sm);
  text-align: center;
  margin-top: var(--space-8);
}

.footer__bottom p {
  margin: 0 auto;
  max-width: var(--container-lg);
  padding: 0 var(--space-4);
  text-align: center;
}

.footer__bottom a {
  color: var(--color-text-inverse);
  text-decoration: underline;
}

/* Code elements in footer need different styling for dark background */
.footer code {
  background-color: #374151;
  color: #e5e7eb;
  padding: 0.125rem 0.5rem;
  border-radius: var(--radius-sm);
  font-weight: var(--font-weight-medium);
}

.footer strong {
  color: var(--color-text-inverse);
  font-weight: var(--font-weight-semibold);
}


/* ============================================
   GRID LAYOUTS
   ============================================ */

/* Feature grid (for homepage feature cards) */
.feature-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
  margin-bottom: var(--space-8);
}

@media (min-width: 48rem) { /* 768px - tablet */
  .feature-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 64rem) { /* 1024px - desktop */
  .feature-grid {
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-8);
  }
}

/* Two-column grid */
.grid-2col {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
}

@media (min-width: 48rem) { /* 768px - tablet */
  .grid-2col {
    grid-template-columns: repeat(2, 1fr);
  }
}


/* ============================================
   ICONS (placeholder for future SVG icons)
   ============================================ */

.icon {
  width: 24px;
  height: 24px;
  display: inline-block;
  vertical-align: middle;
}

.icon--lg {
  width: 32px;
  height: 32px;
}

.icon--xl {
  width: 48px;
  height: 48px;
}


/* ============================================
   TOAST NOTIFICATIONS (for copy feedback)
   ============================================ */

.toast {
  position: fixed;
  bottom: var(--space-6);
  right: var(--space-6);
  background-color: var(--color-text-primary);
  color: var(--color-text-inverse);
  padding: var(--space-4) var(--space-6);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-xl);
  z-index: var(--z-toast);
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-family: var(--font-primary);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  opacity: 0;
  transform: translateY(100px);
  transition: opacity var(--duration-base) var(--ease-out),
              transform var(--duration-base) var(--ease-out);
  pointer-events: none;
}

.toast--visible {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

.toast--success {
  background-color: var(--color-success);
}

.toast--error {
  background-color: var(--color-error);
}

.toast--info {
  background-color: var(--color-info);
}


/* ============================================
   DOCUMENTATION LAYOUT
   ============================================ */

/* Main documentation container */
.doc-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  max-width: var(--container-xl);
  margin: 0 auto;
}

@media (min-width: 64rem) { /* 1024px - desktop */
  .doc-layout {
    grid-template-columns: 250px 1fr;
    gap: var(--space-8);
  }
}

@media (min-width: 80rem) { /* 1280px - wide */
  .doc-layout {
    grid-template-columns: 250px 1fr 220px;
  }
}

/* Sidebar navigation */
.doc-sidebar {
  background-color: var(--color-bg-surface);
  border-right: var(--border-width-thin) solid var(--color-border-base);
  padding: var(--space-6) var(--space-4);
}

@media (min-width: 64rem) { /* 1024px - desktop */
  .doc-sidebar {
    position: sticky;
    top: 72px; /* Height of nav + spacing */
    height: calc(100vh - 72px);
    overflow-y: auto;
  }
}

.doc-sidebar__title {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-bold);
  text-transform: uppercase;
  letter-spacing: var(--letter-spacing-wide);
  color: var(--color-text-tertiary);
  margin-bottom: var(--space-3);
}

.doc-sidebar__nav {
  list-style: none;
  padding: 0;
  margin: 0;
}

.doc-sidebar__nav-item {
  margin-bottom: var(--space-1);
}

.doc-sidebar__link {
  display: block;
  padding: var(--space-2) var(--space-3);
  color: var(--color-text-secondary);
  text-decoration: none;
  font-size: var(--font-size-sm);
  border-radius: var(--radius-sm);
  transition: var(--transition-colors);
}

.doc-sidebar__link:hover {
  background-color: var(--color-primary-light);
  color: var(--color-primary-dark);
}

.doc-sidebar__link--active {
  background-color: var(--color-primary-light);
  color: var(--color-primary-dark);
  font-weight: var(--font-weight-semibold);
}

/* Main documentation content */
.doc-content {
  padding: var(--space-6) var(--space-4);
  max-width: 800px;
  min-width: 0; /* Prevent overflow */
}

@media (min-width: 48rem) { /* 768px - tablet */
  .doc-content {
    padding: var(--space-8) var(--space-6);
  }
}

/* Table of contents (right rail on wide screens) */
.doc-toc {
  display: none;
}

@media (min-width: 80rem) { /* 1280px - wide */
  .doc-toc {
    display: block;
    padding: var(--space-6) var(--space-4);
    position: sticky;
    top: 72px;
    height: calc(100vh - 72px);
    overflow-y: auto;
  }
}

.doc-toc__title {
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-bold);
  text-transform: uppercase;
  letter-spacing: var(--letter-spacing-wide);
  color: var(--color-text-tertiary);
  margin-bottom: var(--space-3);
}

.doc-toc__list {
  list-style: none;
  padding: 0;
  margin: 0;
  border-left: var(--border-width-medium) solid var(--color-border-base);
}

.doc-toc__item {
  margin-bottom: var(--space-1);
}

.doc-toc__link {
  display: block;
  padding: var(--space-1) var(--space-3);
  margin-left: -2px;
  color: var(--color-text-tertiary);
  text-decoration: none;
  font-size: var(--font-size-xs);
  border-left: var(--border-width-medium) solid transparent;
  transition: var(--transition-colors);
}

.doc-toc__link:hover {
  color: var(--color-primary);
  border-left-color: var(--color-primary);
}

.doc-toc__link--active {
  color: var(--color-primary);
  border-left-color: var(--color-primary);
  font-weight: var(--font-weight-semibold);
}


/* ============================================
   BREADCRUMBS
   ============================================ */

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2);
  margin-bottom: var(--space-6);
  padding: var(--space-3) 0;
  font-size: var(--font-size-sm);
  color: var(--color-text-tertiary);
}

.breadcrumb__item {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.breadcrumb__link {
  color: var(--color-text-secondary);
  text-decoration: none;
  transition: var(--transition-colors);
}

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

.breadcrumb__separator {
  color: var(--color-text-tertiary);
  user-select: none;
}

.breadcrumb__current {
  color: var(--color-text-primary);
  font-weight: var(--font-weight-medium);
}


/* ============================================
   TABLES
   ============================================ */

.table-wrapper {
  overflow-x: auto;
  margin-bottom: var(--space-6);
  border-radius: var(--radius-md);
  border: var(--border-width-thin) solid var(--color-border-base);
}

.table {
  width: 100%;
  border-collapse: collapse;
  margin: 0;
  font-size: var(--font-size-sm);
}

.table thead {
  background-color: var(--color-bg-base);
}

.table th {
  padding: var(--space-3) var(--space-4);
  text-align: left;
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  border-bottom: var(--border-width-medium) solid var(--color-border-strong);
  white-space: nowrap;
}

.table td {
  padding: var(--space-3) var(--space-4);
  border-bottom: var(--border-width-thin) solid var(--color-border-base);
  color: var(--color-text-secondary);
}

.table tbody tr:last-child td {
  border-bottom: none;
}

.table tbody tr:hover {
  background-color: var(--color-bg-base);
}

/* Striped variant */
.table--striped tbody tr:nth-child(even) {
  background-color: var(--color-bg-base);
}

.table--striped tbody tr:hover {
  background-color: var(--color-primary-light);
}

/* Compact variant */
.table--compact th,
.table--compact td {
  padding: var(--space-2) var(--space-3);
}


/* ============================================
   ALERT / CALLOUT BOXES
   ============================================ */

.alert {
  padding: var(--space-6);
  border-radius: 12px;
  margin-bottom: var(--space-6);
  background-color: var(--color-bg-surface);
  display: flex;
  gap: var(--space-3);
  box-shadow: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
  transition: transform var(--duration-base) var(--ease-in-out),
              box-shadow var(--duration-base) var(--ease-in-out);
}

.alert__icon {
  flex-shrink: 0;
  width: 24px;
  height: 24px;
  margin-top: 2px;
}

.alert__content {
  flex: 1;
}

.alert__title {
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--space-2);
  font-size: var(--font-size-base);
}

.alert__message {
  color: var(--color-text-secondary);
  margin: 0;
}

.alert__message p {
  margin-bottom: var(--space-2);
}

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

/* Alert variants */
.alert--info {
  background-color: var(--color-info-bg);
}

.alert--info .alert__icon {
  color: var(--color-info);
}

.alert--info .alert__title {
  color: var(--color-info);
}

.alert--success {
  background-color: var(--color-success-bg);
}

.alert--success .alert__icon {
  color: var(--color-success);
}

.alert--success .alert__title {
  color: var(--color-success);
}

.alert--warning {
  background-color: var(--color-warning-bg);
}

.alert--warning .alert__icon {
  color: var(--color-warning);
}

.alert--warning .alert__title {
  color: var(--color-warning);
}

.alert--error {
  background-color: var(--color-error-bg);
}

.alert--error .alert__icon {
  color: var(--color-error);
}

.alert--error .alert__title {
  color: var(--color-error);
}

/* Tip variant (same as info, but with different icon) */
.alert--tip {
  background-color: var(--color-primary-light);
}

.alert--tip .alert__icon {
  color: var(--color-primary);
}

.alert--tip .alert__title {
  color: var(--color-primary-dark);
}


/* ============================================
   PAGINATION / PREV-NEXT NAVIGATION
   ============================================ */

.page-nav {
  display: flex;
  justify-content: space-between;
  gap: var(--space-4);
  margin-top: var(--space-12);
  padding-top: var(--space-8);
  border-top: var(--border-width-thin) solid var(--color-border-base);
}

.page-nav__link {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  padding: var(--space-4);
  border: var(--border-width-thin) solid var(--color-border-base);
  border-radius: var(--radius-md);
  text-decoration: none;
  transition: var(--transition-base);
  max-width: 45%;
}

.page-nav__link:hover {
  border-color: var(--color-primary);
  background-color: var(--color-primary-light);
}

.page-nav__label {
  font-size: var(--font-size-xs);
  text-transform: uppercase;
  letter-spacing: var(--letter-spacing-wide);
  color: var(--color-text-tertiary);
  font-weight: var(--font-weight-semibold);
}

.page-nav__title {
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-primary);
}

.page-nav__link--next {
  margin-left: auto;
  text-align: right;
}