/* ============================================
   KṬP Saikhamakawn — Layout
   Header, Footer, Navigation, Grid System
   ============================================ */

/* ========================
   HEADER
   ======================== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  background: var(--header-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border-bottom: 1px solid var(--header-border);
  z-index: var(--z-header);
  transition: background var(--transition-base), box-shadow var(--transition-base);
}

.site-header.scrolled {
  box-shadow: var(--shadow-md);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  max-width: var(--container-xl);
  margin: 0 auto;
  padding: 0 var(--sp-4);
  gap: var(--sp-6); /* Prevent items from touching */
}

/* Logo */
.header-logo {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  text-decoration: none;
  z-index: calc(var(--z-header) + 1);
  flex-shrink: 0; /* Ensure logo doesn't shrink */
}

.header-logo img {
  height: 38px;
  width: auto;
  object-fit: contain;
}

.header-logo-text {
  font-family: var(--font-heading);
  font-size: clamp(0.85rem, 3.5vw, var(--fs-md));
  font-weight: var(--fw-bold);
  color: var(--color-text);
  line-height: 1.2;
  white-space: nowrap;
}

.header-logo-text small {
  display: block;
  font-size: clamp(0.65rem, 2.5vw, var(--fs-xs));
  font-weight: var(--fw-regular);
  color: var(--color-text-secondary);
  letter-spacing: 0.5px;
}

/* Desktop Navigation */
.nav-desktop {
  display: none;
  align-items: center;
  gap: var(--sp-1);
  flex: 1;
  justify-content: center;
}

.nav-link {
  padding: var(--sp-2);
  font-family: var(--font-heading);
  font-size: 0.95rem;
  font-weight: var(--fw-medium);
  color: var(--color-text-secondary);
  border-radius: var(--radius-lg);
  transition: all var(--transition-fast);
  text-decoration: none;
  white-space: nowrap;
}

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

.nav-link.active {
  color: var(--brand-sky);
  background: rgba(135, 206, 235, 0.1);
}

/* Nav Dropdown (Desktop) */
.nav-dropdown {
  position: relative;
}

.nav-dropdown-trigger {
  display: flex;
  align-items: center;
  gap: 2px;
  cursor: pointer;
  border: none;
}

.nav-dropdown-trigger svg {
  transition: transform 0.2s ease;
  flex-shrink: 0;
  width: 20px;
  height: 20px;
}

.nav-dropdown-menu.active + .nav-dropdown-trigger svg,
.nav-dropdown-trigger[aria-expanded="true"] svg {
  transform: rotate(180deg);
}

.nav-dropdown-menu {
  position: absolute;
  top: calc(100% + 8px);
  left: 50%;
  transform: translateX(-50%) translateY(-10px) scale(0.95);
  background: var(--color-bg-card);
  border: 1px solid rgba(135, 206, 235, 0.15);
  border-radius: var(--radius-xl);
  box-shadow: 0 15px 35px rgba(0, 0, 0, 0.2);
  padding: var(--sp-2);
  min-width: 200px;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  z-index: var(--z-dropdown);
  transform-origin: top center;
}

@supports (backdrop-filter: blur(16px)) {
  .nav-dropdown-menu {
    background: rgba(var(--color-bg-card-rgb, 10, 15, 25), 0.85);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
  }
}

.nav-dropdown-menu.active {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0) scale(1);
}

.nav-dropdown-item {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  padding: var(--sp-2) var(--sp-4);
  font-family: var(--font-heading);
  font-size: 0.95rem;
  font-weight: var(--fw-medium);
  color: var(--color-text-secondary);
  border-radius: var(--radius-lg);
  text-decoration: none;
  transition: all 0.2s ease;
  white-space: nowrap;
}

.nav-dropdown-item:hover {
  background: var(--color-bg-hover);
  color: var(--color-text);
  transform: translateX(4px);
}

.nav-dropdown-item.active {
  color: var(--brand-sky);
  background: rgba(135, 206, 235, 0.1);
}

/* Mobile Nav Group (Expandable) */
.nav-mobile-group {
  display: flex;
  flex-direction: column;
}

.nav-mobile-group-trigger {
  border: none;
  background: transparent;
  cursor: pointer;
  width: 100%;
  text-align: left;
}

.nav-mobile-subnav {
  margin-left: 26px;
  padding-left: 0;
  border-left: 2px solid var(--color-border);
  margin-top: 4px;
  margin-bottom: 8px;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.nav-mobile-sublink {
  font-size: 0.95rem !important;
  font-weight: var(--fw-medium) !important;
  padding: 8px 16px 8px 20px !important;
  color: var(--color-text-secondary) !important;
  position: relative;
  background: transparent !important;
}

.nav-mobile-sublink::before {
  content: '';
  position: absolute;
  left: 0;
  top: 50%;
  width: 12px;
  height: 2px;
  background: var(--color-border);
  border-radius: 2px;
}

.nav-mobile-sublink:hover, .nav-mobile-sublink.active {
  color: var(--brand-sky) !important;
  background: transparent !important;
}

.nav-mobile-sublink.active::before {
  background: var(--brand-sky);
}

/* Header Actions */
.header-actions {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
}

/* Hide theme switcher and login button on mobile — they live in the mobile menu */
@media (max-width: 767px) {
  .theme-switcher {
    display: none !important;
  }
  #header-user-widget {
    display: none !important;
  }
}

/* Theme Switcher */
.theme-switcher {
  position: relative;
}

.theme-btn {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-lg);
  color: var(--color-text-secondary);
  font-size: var(--fs-xl);
  cursor: pointer;
  transition: all var(--transition-fast);
  background: transparent;
}

.theme-btn:hover {
  background: var(--color-bg-hover);
  color: var(--color-text);
}

.theme-dropdown {
  position: absolute;
  top: calc(100% + var(--sp-2));
  right: 0;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
  padding: var(--sp-2);
  min-width: 160px;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px);
  transition: all var(--transition-fast);
  z-index: var(--z-dropdown);
}

.theme-dropdown.active {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.theme-option {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  width: 100%;
  padding: var(--sp-2) var(--sp-3);
  border-radius: var(--radius-lg);
  font-size: var(--fs-sm);
  color: var(--color-text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
  background: transparent;
}

.theme-option:hover {
  background: var(--color-bg-hover);
  color: var(--color-text);
}

.theme-option.active {
  color: var(--brand-sky);
  background: rgba(135, 206, 235, 0.1);
}

.theme-option-icon {
  font-size: var(--fs-lg);
  width: 24px;
  text-align: center;
}

/* Mobile Menu Toggle */
.mobile-menu-btn {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 40px;
  height: 40px;
  gap: 5px;
  cursor: pointer;
  z-index: calc(var(--z-header) + 2);
  background: transparent;
  border-radius: var(--radius-lg);
  transition: background var(--transition-fast);
}

.mobile-menu-btn:hover {
  background: var(--color-bg-hover);
  transform: scale(1.05);
}

.hamburger-line {
  width: 22px;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  transform-origin: center;
}

.hamburger-line:nth-child(2) {
  width: 14px;
  align-self: flex-end;
  margin-right: 9px; /* Since btn is 40px, align visually */
}

.mobile-menu-btn:hover .hamburger-line:nth-child(2) {
  width: 22px;
}

.mobile-menu-btn.open .hamburger-line:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.mobile-menu-btn.open .hamburger-line:nth-child(2) {
  opacity: 0;
  transform: translateX(-10px);
}

.mobile-menu-btn.open .hamburger-line:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* Mobile Navigation Dropdown */
.nav-mobile {
  position: fixed;
  top: calc(var(--header-height) + var(--sp-2));
  right: var(--sp-4);
  width: calc(100vw - var(--sp-8));
  max-width: 320px;
  background: var(--color-bg-card);
  border: 1px solid rgba(135, 206, 235, 0.15); /* Subtly branded border */
  border-radius: var(--radius-xl);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.2);
  z-index: var(--z-header);
  display: flex;
  flex-direction: column;
  padding: var(--sp-4);
  padding-bottom: calc(var(--sp-6) + env(safe-area-inset-bottom, 0px));
  transform: translateY(-20px) scale(0.98);
  transform-origin: top right;
  opacity: 0;
  visibility: hidden;
  transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
  overflow-y: auto;
  max-height: calc(100vh - var(--header-height) - var(--sp-6));
  max-height: calc(100dvh - var(--header-height) - var(--sp-6));
}

@supports (backdrop-filter: blur(16px)) {
  .nav-mobile {
    background: rgba(var(--color-bg-card-rgb, 10, 15, 25), 0.85); /* Hardcoded generic dark fallback, relying on theme var if available */
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
  }
}

.nav-mobile.open {
  transform: translateY(0) scale(1);
  opacity: 1;
  visibility: visible;
}

.nav-mobile-link {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  padding: var(--sp-3) var(--sp-4);
  font-family: var(--font-heading);
  font-size: var(--fs-lg);
  font-weight: var(--fw-semibold);
  color: var(--color-text);
  border-radius: var(--radius-lg);
  text-decoration: none;
  transition: all 0.3s ease;
}

.nav-mobile-link:hover {
  background: var(--color-bg-hover);
  color: var(--brand-sky);
  transform: translateX(4px);
}

.nav-mobile-link.active {
  color: var(--brand-sky);
  background: rgba(135, 206, 235, 0.08);
}

.nav-mobile-link .nav-icon {
  font-size: var(--fs-xl);
  width: 28px;
  text-align: center;
}

.nav-mobile-divider {
  height: 1px;
  background: var(--color-border);
  margin: var(--sp-4) 0;
}

.nav-mobile-footer {
  margin-top: auto;
  padding-top: var(--sp-4);
  border-top: 1px solid var(--color-border);
}

/* Desktop: show desktop nav, hide hamburger */
@media (min-width: 768px) {
  .nav-desktop {
    display: flex;
  }

  .mobile-menu-btn {
    display: none;
  }

  .header-inner {
    padding: 0 var(--sp-6);
  }

  .header-logo img {
    height: 44px;
    width: auto;
  }
}

@media (min-width: 1024px) {
  .header-inner {
    padding: 0 var(--sp-8);
  }
}

/* ========================
   FOOTER
   ======================== */
.site-footer {
  background: var(--footer-bg);
  color: var(--footer-text);
  padding-top: 0;
}

.footer-content {
  max-width: var(--container-xl);
  margin: 0 auto;
  padding: var(--sp-10) var(--sp-4) var(--sp-6);
}

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

@media (min-width: 640px) {
  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 768px) {
  .footer-grid {
    grid-template-columns: 2fr 1fr 1fr;
  }
  .footer-content {
    padding: var(--sp-12) var(--sp-6) var(--sp-6);
  }
}

/* Footer Logo section */
.footer-brand {
  display: flex;
  flex-direction: column;
  gap: var(--sp-4);
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
}

.footer-logo img {
  height: 48px;
  width: auto;
  object-fit: contain;
}

.footer-logo-text {
  font-family: var(--font-heading);
  font-size: var(--fs-lg);
  font-weight: var(--fw-bold);
  color: #fff;
}

.footer-logo-text small {
  display: block;
  font-size: var(--fs-xs);
  font-weight: var(--fw-regular);
  color: var(--footer-text);
  opacity: 0.7;
}

.footer-desc {
  font-size: var(--fs-sm);
  color: var(--footer-text);
  line-height: var(--lh-relaxed);
  max-width: 350px;
}

/* Footer sections */
.footer-section h4 {
  font-family: var(--font-heading);
  font-size: var(--fs-sm);
  font-weight: var(--fw-semibold);
  color: #fff;
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: var(--sp-4);
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: var(--sp-3);
}

.footer-link {
  font-size: var(--fs-sm);
  color: var(--footer-text);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.footer-link:hover {
  color: var(--brand-sky);
}

.footer-contact-item {
  display: flex;
  align-items: flex-start;
  gap: var(--sp-3);
  font-size: var(--fs-sm);
  color: var(--footer-text);
  margin-bottom: var(--sp-3);
}

.footer-contact-item .icon {
  flex-shrink: 0;
  margin-top: 2px;
}

/* Footer bottom */
.footer-bottom {
  display: flex;
  flex-direction: column;
  gap: var(--sp-4);
  align-items: center;
  padding-top: var(--sp-6);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

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

.footer-copyright {
  font-size: var(--fs-xs);
  color: var(--footer-text);
  opacity: 0.6;
}

/* AdSense Placeholder */
.footer-adsense {
  width: 100%;
  padding: var(--sp-4);
  border: 1px dashed rgba(255, 255, 255, 0.15);
  border-radius: var(--radius-lg);
  text-align: center;
  font-size: var(--fs-xs);
  color: rgba(255, 255, 255, 0.3);
  margin-top: var(--sp-6);
}

/* ========================
   MAIN CONTENT AREA
   ======================== */
.main-content {
  min-height: 100vh;
  padding-top: var(--header-height);
}

/* Page Header / Hero area for sub-pages */
.page-hero {
  padding: var(--sp-8) 0 var(--sp-6);
  text-align: center;
}

.page-hero h1 {
  font-size: var(--fs-3xl);
  margin-bottom: var(--sp-3);
}

.page-hero p {
  max-width: 500px;
  margin: 0 auto;
}

@media (min-width: 768px) {
  .page-hero {
    padding: var(--sp-12) 0 var(--sp-8);
  }
}

/* Toolbar: search + filters row */
.content-toolbar {
  display: flex;
  flex-direction: column;
  gap: var(--sp-4);
  margin-bottom: var(--sp-6);
}

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

.toolbar-filters {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-2);
  align-items: center;
  overflow-x: auto;
  padding-bottom: var(--sp-1);
  -webkit-overflow-scrolling: touch;
}