/* ==========================================================================
   LAYOUT STYLES - INSIDE ART PROTOTYPE
   Grid System, Containers, Header, Mega-menu, Footer, Page Sections
   ========================================================================== */

.container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--container-pad);
  padding-right: var(--container-pad);
}

.main-content {
  flex: 1 0 auto;
  width: 100%;
  padding-bottom: var(--sp-16); /* 64px guarantees spacing before footer */
}

/* Sections */
.section {
  padding-top: var(--sp-16);
  padding-bottom: var(--sp-16);
}

.section--sm {
  padding-top: var(--sp-8);
  padding-bottom: var(--sp-8);
}

.section--surface {
  background-color: var(--c-surface);
  border-top: 1px solid var(--c-line);
  border-bottom: 1px solid var(--c-line);
}

.section--black {
  background-color: var(--c-black);
  color: var(--c-invert);
}

.section--black h1,
.section--black h2,
.section--black h3,
.section--black h4,
.section--black p,
.section--black a {
  color: var(--c-invert);
}

.section__header {
  margin-bottom: var(--sp-8);
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: var(--sp-4);
  flex-wrap: wrap;
}

.section__header--center {
  text-align: center;
  justify-content: center;
}

.section__tagline {
  font-size: var(--fs-xs);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-weight: 700;
  color: var(--c-muted);
  margin-bottom: var(--sp-2);
}

.section__title {
  margin-bottom: var(--sp-2);
}

.section__subtitle {
  font-size: var(--fs-md);
  color: var(--c-muted);
  max-width: 720px;
  line-height: 1.5;
}

/* 2-Level Header (Pixel-Perfect Optical Alignment) */
.site-header {
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
  background-color: var(--c-bg);
  border-bottom: 1px solid var(--c-line);
}

/* Top Bar */
.header-top {
  background-color: var(--c-surface);
  border-bottom: 1px solid var(--c-line);
  height: 40px;
  line-height: 40px;
  display: flex;
  align-items: center;
}

.header-top__inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 40px;
  width: 100%;
}

.header-top__nav {
  display: flex;
  align-items: center;
  height: 40px;
  gap: var(--sp-6);
  list-style: none !important;
  padding: 0 !important;
  margin: 0 !important;
}

.header-top__nav li,
.header-top__nav-item {
  display: flex !important;
  align-items: center !important;
  height: 40px !important;
  margin: 0 !important;
  padding: 0 !important;
  list-style: none !important;
}

.header-top__link {
  color: var(--c-ink-2);
  text-decoration: none;
  font-size: 13px;
  font-weight: 500;
  line-height: 40px;
  display: flex;
  align-items: center;
  height: 40px;
  margin: 0;
  padding: 0;
  transition: color var(--t-fast);
}

.header-top__link:hover {
  color: var(--c-black);
  text-decoration: underline;
  text-underline-offset: 4px;
}

.header-top__tools {
  display: flex;
  align-items: center;
  height: 40px;
  gap: var(--sp-4);
  margin: 0;
  padding: 0;
}

.header-top__search-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: none;
  border: none;
  padding: 0;
  margin: 0;
  color: var(--c-ink-2);
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  line-height: 40px;
  height: 40px;
  transition: color var(--t-fast);
}

.header-top__search-btn:hover {
  color: var(--c-black);
  text-decoration: underline;
  text-underline-offset: 4px;
}

.header-top__cart-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 0 10px;
  background-color: var(--c-bg);
  border: 1px solid var(--c-line);
  border-radius: var(--radius-sm);
  color: var(--c-black);
  font-size: 13px;
  font-weight: 600;
  line-height: 28px;
  height: 28px;
  text-decoration: none;
  margin: 0;
  transition: border-color var(--t-fast), background-color var(--t-fast);
}

.header-top__cart-link:hover {
  border-color: var(--c-black);
  text-decoration: none;
}

.header-top__cart-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 18px;
  height: 18px;
  padding: 0 4px;
  font-size: 11px;
  font-weight: 700;
  background-color: var(--c-black);
  color: var(--c-invert);
  border-radius: var(--radius-sm);
  line-height: 1;
}

/* Header Main (2nd Level) */
.header-main {
  height: var(--header-height-main);
  display: flex;
  align-items: center;
  background-color: var(--c-bg);
}

.header-main__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-6);
  height: 100%;
  width: 100%;
}

.logo {
  display: inline-flex;
  align-items: center;
  text-decoration: none;
  color: var(--c-black);
  line-height: 1;
}

.logo__brand {
  font-size: 22px;
  font-weight: 800;
  letter-spacing: -0.02em;
  text-transform: uppercase;
}

.header-main__nav {
  display: flex;
  align-items: center;
  height: 100%;
  gap: var(--sp-6);
  list-style: none !important;
  padding: 0 !important;
  margin: 0 !important;
}

.header-main__nav li {
  margin: 0 !important;
  padding: 0 !important;
  list-style: none !important;
}

.nav-link {
  font-size: var(--fs-nav);
  font-weight: 600;
  color: var(--c-ink);
  text-decoration: none;
  height: 100%;
  display: inline-flex;
  align-items: center;
  gap: var(--sp-1);
  background: none;
  border: none;
  cursor: pointer;
  line-height: 1;
  padding: 0;
}

.nav-link:hover,
.nav-link.is-active {
  color: var(--c-black);
  text-decoration: underline;
  text-underline-offset: 8px;
}

.header-main__contact {
  display: flex;
  align-items: center;
  gap: var(--sp-4);
  height: 100%;
}

.header-phone {
  font-size: var(--fs-nav);
  font-weight: 700;
  color: var(--c-black);
  text-decoration: none;
  white-space: nowrap;
}

/* Mega-Menu Container */
.mega-menu {
  position: absolute;
  top: 100%;
  left: 0;
  width: 100%;
  background: var(--c-bg);
  border-bottom: 2px solid var(--c-black);
  padding: var(--sp-8) 0;
  display: none;
  z-index: var(--z-dropdown);
}

.mega-menu.is-open {
  display: block;
}

.mega-menu__grid {
  display: grid;
  grid-template-columns: 1.2fr 1.1fr 1fr 0.9fr 0.9fr;
  gap: var(--sp-8);
}

.mega-menu__col-title {
  font-size: var(--fs-sm);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 700;
  color: var(--c-black);
  border-bottom: 1px solid var(--c-line);
  padding-bottom: var(--sp-2);
  margin-bottom: var(--sp-3);
}

.mega-menu__list {
  list-style: none !important;
  padding: 0 !important;
  margin: 0 !important;
  display: flex;
  flex-direction: column;
  gap: var(--sp-2);
}

.mega-menu__list li,
.mega-menu__sublist li {
  margin: 0 !important;
  padding: 0 !important;
  list-style: none !important;
}

.mega-menu__item a {
  font-size: var(--fs-xs);
  color: var(--c-ink-2);
  text-decoration: none;
  line-height: 1.4;
  display: block;
}

.mega-menu__item a:hover {
  color: var(--c-black);
  font-weight: 600;
}

.mega-menu__subgroup {
  margin-bottom: var(--sp-3);
}

.mega-menu__subgroup-title {
  font-size: var(--fs-xs);
  font-weight: 700;
  color: var(--c-ink);
  margin-bottom: var(--sp-1);
}

.mega-menu__sublist {
  list-style: none !important;
  padding-left: var(--sp-3) !important;
  margin: 0 !important;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

/* ==========================================================================
   HERO SLIDER COMPONENT (Fixed Height & Zero Content Jumping)
   ========================================================================== */
.hero-slider {
  position: relative;
  background-color: var(--c-surface);
  border-bottom: 1px solid var(--c-line);
}

.hero-slide {
  display: none;
  min-height: 430px;
  padding: var(--sp-12) 0 var(--sp-6) 0;
  box-sizing: border-box;
}

.hero-slide.is-active {
  display: flex;
  flex-direction: column;
}

.hero-slide__content {
  max-width: 860px;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.hero-slide__title {
  font-size: var(--fs-3xl);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.15;
  margin-bottom: var(--sp-4);
  min-height: 92px; /* Stable 2-line title container */
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
}

.hero-slide__desc {
  font-size: var(--fs-md);
  color: var(--c-ink-2);
  line-height: 1.6;
  margin-bottom: var(--sp-6);
  max-width: 720px;
  min-height: 86px; /* Stable 3-line description container */
}

.hero-slide__actions {
  display: flex;
  gap: var(--sp-3);
  flex-wrap: wrap;
  margin-bottom: var(--sp-8);
}

.hero-slide__stats {
  display: flex;
  gap: var(--sp-8);
  padding-top: var(--sp-6);
  border-top: 1px solid var(--c-line);
  margin-top: auto;
}

.hero-slider__controls {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: var(--sp-6);
  padding-bottom: var(--sp-8);
  margin-top: var(--sp-4);
  border-top: 1px solid var(--c-line);
}

.hero-slider__nav {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
}

.hero-slider__dots {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
}

.slider-dot {
  padding: 6px 12px;
  font-size: var(--fs-xs);
  font-weight: 700;
  border: 1px solid var(--c-line);
  background: var(--c-bg);
  cursor: pointer;
  border-radius: var(--radius-sm);
  color: var(--c-muted);
}

.slider-dot.is-active {
  background-color: var(--c-black);
  color: var(--c-invert);
  border-color: var(--c-black);
}

/* Footer Layout */
.site-footer {
  background-color: var(--c-black);
  color: var(--c-invert);
  border-top: 1px solid var(--c-line-2);
  padding-top: var(--sp-16);
  padding-bottom: var(--sp-8);
  margin-top: auto;
}

.site-footer a {
  color: var(--c-surface-2);
}

.site-footer a:hover {
  color: var(--c-invert);
}

.footer-top {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1.2fr;
  gap: var(--sp-8);
  padding-bottom: var(--sp-12);
  border-bottom: 1px solid var(--c-ink-2);
}

.footer-branch-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--sp-6);
  padding: var(--sp-10) 0;
  border-bottom: 1px solid var(--c-ink-2);
}

.branch-card {
  border-left: 2px solid var(--c-line-2);
  padding-left: var(--sp-4);
}

.branch-card__city {
  font-size: var(--fs-sm);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--c-invert);
  margin-bottom: var(--sp-1);
}

.branch-card__address {
  font-size: var(--fs-xs);
  color: var(--c-muted);
  line-height: 1.4;
  margin-bottom: var(--sp-2);
}

.branch-card__phone {
  font-size: var(--fs-xs);
  font-weight: 600;
  color: var(--c-surface-2);
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: var(--sp-6);
  font-size: var(--fs-xs);
  color: var(--c-muted);
  flex-wrap: wrap;
  gap: var(--sp-4);
}

.footer-branding {
  font-weight: 600;
  color: var(--c-surface-2);
}

/* Grids */
.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--sp-6);
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--sp-6);
}

.grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--sp-6);
}

.grid-sidebar {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: var(--sp-8);
}

.grid-configurator {
  display: grid;
  grid-template-columns: 1.3fr 1fr;
  gap: var(--sp-8);
  align-items: start;
}

.grid-cart {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: var(--sp-8);
  align-items: start;
  margin-bottom: var(--sp-16);
}

/* Responsive */
@media (max-width: 1024px) {
  .mega-menu__grid {
    grid-template-columns: repeat(3, 1fr);
  }
  .grid-configurator, .grid-cart {
    grid-template-columns: 1fr;
  }
  .grid-sidebar {
    grid-template-columns: 1fr;
  }
  .footer-top {
    grid-template-columns: 1fr 1fr;
  }
  .footer-branch-grid {
    grid-template-columns: 1fr 1fr;
  }
  .grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .header-top {
    display: none;
  }
  .header-main__nav {
    display: none;
  }
  .grid-3, .grid-2 {
    grid-template-columns: 1fr;
  }
  .footer-top, .footer-branch-grid {
    grid-template-columns: 1fr;
  }
  .section {
    padding-top: var(--sp-10);
    padding-bottom: var(--sp-10);
  }
}