/**
 * Site Layout System
 * Defines the standard page structure for all pages
 * No !important - proper cascade architecture
 */

/* ============================================================================
 * LAYOUT CONTAINER - Standard page wrapper
 * ============================================================================ */

.site-layout {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.site-layout__inner {
  flex: 1;
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 24px;
}

@media (max-width: 768px) {
  .site-layout__inner {
    padding: 24px 16px;
  }
}

/* ============================================================================
 * SITE HEADER - Consistent across all pages
 * ============================================================================ */

.site-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 32px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--color-border-2);
  gap: 16px;
}

@media (max-width: 768px) {
  .site-header {
    flex-wrap: wrap;
    gap: 12px;
  }
}

/* Header - Back Link */
.site-header__back {
  display: flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  transition: opacity 150ms ease;
}

.site-header__back:hover {
  opacity: 0.8;
}

.site-header__back-icon {
  width: 16px;
  height: 16px;
  color: var(--color-text-2);
  flex-shrink: 0;
  transition: transform 150ms ease;
}

.site-header__back:hover .site-header__back-icon {
  transform: translateX(-3px);
}

.site-header__title {
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 600;
  color: var(--color-text);
  letter-spacing: -0.025em;
  margin: 0;
}

/* Header - Navigation */
.site-header__nav {
  display: flex;
  gap: 4px;
  align-items: center;
}

@media (max-width: 768px) {
  .site-header__nav {
    order: 3;
    width: 100%;
    justify-content: center;
  }
}

@media (max-width: 640px) {
  .site-header__nav {
    display: none;
  }
}

.site-header__nav-link {
  padding: 8px 12px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  font-size: 12px;
  font-weight: 500;
  color: var(--color-text-2);
  text-decoration: none;
  transition: all 150ms ease;
  white-space: nowrap;
}

.site-header__nav-link:hover {
  background: var(--color-surface-hover);
  color: var(--color-text);
  border-color: var(--color-primary);
}

.site-header__nav-link--active {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: white;
  font-weight: 600;
}

/* Header - Theme Toggle */
.site-header__theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  cursor: pointer;
  transition: all 150ms ease;
  flex-shrink: 0;
}

.site-header__theme-toggle:hover {
  background: var(--color-surface-hover);
  border-color: var(--color-primary);
  transform: rotate(15deg);
}

.site-header__theme-toggle:active {
  transform: scale(0.95) rotate(15deg);
}

.site-header__theme-icon {
  width: 16px;
  height: 16px;
  color: var(--color-text-2);
  transition: color 150ms ease;
}

.site-header__theme-toggle:hover .site-header__theme-icon {
  color: var(--color-primary);
}

/* ============================================================================
 * MAIN CONTENT AREA
 * ============================================================================ */

.site-main {
  flex: 1;
}

/* ============================================================================
 * SITE FOOTER - Consistent series navigation
 * ============================================================================ */

.site-footer {
  margin-top: 48px;
  padding-top: 24px;
  border-top: 1px solid var(--color-border-2);
}

.site-footer__nav {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}

@media (max-width: 640px) {
  .site-footer__nav {
    grid-template-columns: 1fr;
  }
}

.site-footer__link {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 16px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  text-decoration: none;
  transition: all 150ms ease;
}

.site-footer__link:hover {
  border-color: var(--color-primary);
  transform: translateY(-2px);
}

.site-footer__link--current {
  border-color: var(--color-primary);
  background: rgba(56, 189, 248, 0.05);
}

.site-footer__link-label {
  font-size: 10px;
  font-weight: 600;
  color: var(--color-text-3);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.site-footer__link-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-text);
}

.site-footer__link-desc {
  font-size: 12px;
  color: var(--color-text-2);
}