/* ==========================================================================
   Button System
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
  min-height: var(--touch-target-min);
  border-radius: var(--radius-md); /* 12px based on design.md */
  padding: 0 var(--space-md);
  border: 1px solid transparent;
  background: transparent;
  cursor: pointer;
  transition: all 0.2s ease;
  /* Typography */
  font-family: var(--font-family);
  font-size: var(--font-label-md-size);
  font-weight: var(--font-label-md-weight);
  letter-spacing: var(--font-label-md-ls);
  line-height: 1;
}

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

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

/* Variants */
.btn-primary {
  background-color: var(--color-brand-royal-600);
  color: var(--color-on-primary);
}
.btn-primary:hover:not(:disabled) {
  background-color: var(--color-brand-royal-700);
}

.btn-secondary {
  background-color: var(--color-brand-sky-50);
  color: var(--color-primary-container);
  border-color: #bfdbfe;
}
.btn-secondary:hover:not(:disabled) {
  background-color: #e0f2fe;
}

.btn-premium {
  background-color: #f59e0b;
  color: #fff;
}
.btn-premium:hover:not(:disabled) {
  background-color: #d97706;
}

.btn-ghost {
  color: var(--color-brand-royal-600);
}
.btn-ghost:hover:not(:disabled) {
  background-color: var(--color-brand-sky-50);
}

.btn-icon {
  padding: 0;
  width: var(--touch-target-min);
  border-radius: var(--radius-full);
}

.btn-link {
  color: var(--color-brand-royal-600);
  padding: 0;
  min-height: 0;
  font-weight: var(--font-title-md-weight);
}
.btn-link:hover:not(:disabled) {
  text-decoration: underline;
}

/* ==========================================================================
   Form Controls
   ========================================================================== */
.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-2xs);
}

.label {
  font-size: var(--font-label-md-size);
  font-weight: var(--font-label-md-weight);
  color: var(--color-on-surface);
}

.input, .select, .textarea {
  width: 100%;
  min-height: var(--touch-target-min);
  padding: 0 var(--space-sm);
  border-radius: var(--radius-md); /* 12px based on design.md */
  border: 1px solid var(--color-border-subtle);
  background-color: var(--color-surface-container-lowest);
  font-family: var(--font-family);
  font-size: var(--font-body-md-size);
  color: var(--color-on-surface);
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.textarea {
  padding: var(--space-sm);
  resize: vertical;
  min-height: 100px;
}

.input:focus, .select:focus, .textarea:focus {
  outline: none;
  border-color: var(--color-brand-royal-600);
  box-shadow: 0 0 0 2px var(--color-border-focus);
}

.input:disabled, .select:disabled, .textarea:disabled {
  background-color: var(--color-surface-card-tint);
  color: var(--color-text-muted);
  cursor: not-allowed;
}

.input.error {
  border-color: var(--color-error);
}
.input.error:focus {
  box-shadow: 0 0 0 2px var(--color-error-container);
}

/* Checkbox & Radio Base */
.checkbox, .radio {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  cursor: pointer;
}
.checkbox input, .radio input {
  width: 20px;
  height: 20px;
  accent-color: var(--color-brand-royal-600);
  cursor: pointer;
}

/* ==========================================================================
   Badges and Chips
   ========================================================================== */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px 8px;
  border-radius: var(--radius-sm); /* 8px for metadata */
  text-transform: uppercase;
  font-size: var(--font-badge-xs-size);
  font-weight: var(--font-badge-xs-weight);
  letter-spacing: var(--font-badge-xs-ls);
}

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

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

.badge-lang {
  background-color: var(--color-surface-card-tint);
  color: var(--color-text-secondary);
}

.chip {
  display: inline-flex;
  align-items: center;
  min-height: 36px;
  padding: 0 var(--space-md);
  border-radius: var(--radius-full);
  border: 1px solid var(--color-border-subtle);
  background-color: var(--color-surface-container-lowest);
  font-size: var(--font-label-md-size);
  font-weight: var(--font-label-md-weight);
  color: var(--color-text-secondary);
  cursor: pointer;
  transition: all 0.2s ease;
  white-space: nowrap;
}

.chip:hover {
  background-color: var(--color-surface-card-tint);
}

.chip.active, .chip-active {
  background-color: var(--color-brand-royal-600);
  color: var(--color-on-primary);
  border-color: var(--color-brand-royal-600);
}

/* ==========================================================================
   Card Foundation
   ========================================================================== */
.card {
  background: var(--color-surface-container-lowest);
  border-radius: 20px;
  box-shadow: var(--shadow-elevation-1);
  overflow: hidden;
  transition: box-shadow 0.2s ease;
  display: flex;
  flex-direction: column;
}

/* Template Card */
.card-template {
  position: relative;
  border-radius: 18px; /* Based on design.md */
}
.card-template:hover {
  box-shadow: var(--shadow-elevation-2);
}

.card-template__media {
  position: relative;
  background-color: var(--color-surface-card-tint);
  overflow: hidden;
  border-radius: 14px 14px 0 0; /* inner clipping */
}
.card-template__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.card-template__media.ratio-1-1 { aspect-ratio: 1/1; }
.card-template__media.ratio-9-16 { aspect-ratio: 9/16; }
.card-template__media.ratio-16-9 { aspect-ratio: 16/9; }

.card-template__badges {
  position: absolute;
  top: var(--space-sm);
  left: var(--space-sm);
  display: flex;
  gap: var(--space-xs);
}

.card-template__actions {
  position: absolute;
  top: var(--space-sm);
  right: var(--space-sm);
}

.btn-favorite {
  background: rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(8px);
  border-radius: var(--radius-full);
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: none;
  cursor: pointer;
  color: var(--color-text-secondary);
}
.btn-favorite:hover {
  color: var(--color-error);
}

.card-template__footer {
  padding: var(--space-md);
  display: flex;
  flex-direction: column;
  gap: var(--space-2xs);
}

.card-template__title {
  font-size: var(--font-body-md-size);
  font-weight: 600;
  color: var(--color-on-surface);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.card-template__meta {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  font-size: var(--font-label-sm-size);
  color: var(--color-text-secondary);
  text-transform: uppercase;
}

/* Category & General Cards */
.card-category {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: var(--space-lg) var(--space-md);
  text-align: center;
  border-radius: 24px;
}
.card-category:hover {
  background-color: var(--color-surface-card-tint);
}

.card-review {
  padding: var(--space-lg);
  border-radius: 16px;
  border: 1px solid var(--color-border-subtle);
  box-shadow: none;
}

/* ==========================================================================
   Site Header
   ========================================================================== */
.site-header {
  background-color: var(--color-surface-container-lowest);
  border-bottom: 1px solid var(--color-border-subtle);
  position: sticky;
  top: 0;
  z-index: 100;
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px; /* standard desktop header height */
}

.site-header__logo {
  display: flex;
  align-items: center;
}

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

.site-header__actions {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

/* Mobile Nav Structure (Visually static) */
.site-header__mobile-toggle {
  display: none;
}

/* Mobile Bottom Nav (App-like behavior as per reference) */
.mobile-bottom-nav {
  display: none;
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background-color: var(--color-surface-container-lowest);
  border-top: 1px solid var(--color-border-subtle);
  padding: var(--space-xs) 0;
  z-index: 100;
}

.mobile-bottom-nav__inner {
  display: flex;
  justify-content: space-around;
  align-items: center;
}

.mobile-bottom-nav__item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  color: var(--color-text-secondary);
  font-size: 11px;
  font-weight: 600;
}
.mobile-bottom-nav__item.active {
  color: var(--color-brand-royal-600);
}

/* ==========================================================================
   Site Footer
   ========================================================================== */
.site-footer {
  background-color: var(--color-surface-ice);
  border-top: 1px solid var(--color-border-subtle);
  padding: var(--space-3xl) 0 var(--space-xl);
  margin-top: auto;
}

.site-footer__grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--space-xl);
  margin-bottom: var(--space-2xl);
}

.site-footer__brand p {
  color: var(--color-text-secondary);
  margin-top: var(--space-md);
  font-size: var(--font-body-md-size);
}

.site-footer__heading {
  font-size: var(--font-title-md-size);
  font-weight: var(--font-title-md-weight);
  margin-bottom: var(--space-md);
  color: var(--color-on-surface);
}

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

.site-footer__nav a {
  color: var(--color-text-secondary);
  font-size: var(--font-body-md-size);
  transition: color 0.2s ease;
}
.site-footer__nav a:hover {
  color: var(--color-brand-royal-600);
}

.site-footer__bottom {
  border-top: 1px solid var(--color-border-subtle);
  padding-top: var(--space-lg);
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: var(--color-text-muted);
  font-size: var(--font-body-sm-size);
}

/* ==========================================================================
   Search UI Foundation (Omni-Search)
   ========================================================================== */
.omni-search {
  position: relative;
  display: flex;
  align-items: center;
  background-color: var(--color-surface-container-lowest);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-full);
  height: 52px; /* based on design.md */
  padding: 0 var(--space-sm) 0 var(--space-lg);
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
  max-width: 600px;
  width: 100%;
}
.omni-search:focus-within {
  border-color: var(--color-brand-royal-600);
  box-shadow: 0 0 0 2px var(--color-border-focus);
}

.omni-search__icon {
  color: var(--color-text-muted);
  display: flex;
  align-items: center;
}

.omni-search__input {
  flex: 1;
  border: none;
  background: transparent;
  padding: 0 var(--space-md);
  height: 100%;
  font-size: var(--font-body-lg-size);
  color: var(--color-on-surface);
  outline: none;
}
.omni-search__input::placeholder {
  color: var(--color-text-muted);
}

.omni-search__action {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

/* ==========================================================================
   Breadcrumb Foundation
   ========================================================================== */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  font-size: var(--font-body-sm-size);
  color: var(--color-text-secondary);
}

.breadcrumb a {
  color: var(--color-brand-royal-600);
}
.breadcrumb a:hover {
  text-decoration: underline;
}

.breadcrumb span.separator {
  color: var(--color-text-muted);
}

/* ==========================================================================
   Responsive Overrides
   ========================================================================== */
@media (max-width: 1023px) {
  .site-footer__grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 767px) {
  /* Header */
  .site-header__nav, .site-header__actions {
    display: none; /* Hide desktop nav */
  }
  .site-header__mobile-toggle {
    display: flex; /* Show hamburger if needed */
  }
  
  /* Mobile Bottom Nav appears */
  .mobile-bottom-nav {
    display: block;
  }

  /* Accommodate bottom nav padding on body */
  body {
    padding-bottom: 60px;
  }

  /* Omni Search shrinks */
  .omni-search {
    height: 48px;
    padding-left: var(--space-md);
  }
  .omni-search__input {
    font-size: var(--font-body-md-size);
  }

  /* Footer stacks */
  .site-footer__grid {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }
  .site-footer__bottom {
    flex-direction: column;
    text-align: center;
    gap: var(--space-md);
  }
}