/* ==========================================================
   SVFutureTechAI Premium Header and Mega Menu
========================================================== */

.sv-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, .82);
  border-bottom: 1px solid rgba(226, 232, 240, .78);
  box-shadow: none;
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
}

.sv-header.is-scrolled {
  background: rgba(255, 255, 255, .96);
  box-shadow: 0 18px 45px rgba(15, 23, 42, .08);
}

.sv-theme-dark .sv-header {
  background: rgba(7, 19, 41, .94);
  border-color: rgba(148, 163, 184, .18);
}

.sv-theme-dark .sv-menu-link--root,
.sv-theme-dark .sv-header-search,
.sv-theme-dark .sv-header-action-icon {
  color: #f8fafc;
}

.sv-theme-dark .sv-header-search,
.sv-theme-dark .sv-header-action-icon {
  background: rgba(255, 255, 255, .08);
  border-color: rgba(255, 255, 255, .12);
}

.sv-theme-dark .sv-mega-panel__inner {
  background: rgba(15, 23, 42, .98);
  border-color: rgba(148, 163, 184, .22);
}

.sv-theme-dark .sv-mega-category,
.sv-theme-dark .sv-mega-feature-card h3,
.sv-theme-dark .sv-mega-category__content strong {
  color: #f8fafc;
}

.sv-theme-dark .sv-mega-category__content small,
.sv-theme-dark .sv-mega-feature-card p {
  color: #cbd5e1;
}

.sv-header-main > .sv-container,
.sv-header .sv-container {
  max-width: 1440px;
}

.sv-header-wrapper {
  min-height: 76px;
  gap: 28px;
}

.sv-header-left,
.sv-header-right {
  width: auto;
  min-width: 190px;
}

.sv-logo a {
  display: inline-flex;
  align-items: center;
}

.sv-logo img {
  max-width: 205px;
  height: auto;
  max-height: 52px;
  object-fit: contain;
}

.sv-logo-text {
  color: #07133b;
  font-size: 24px;
  font-weight: 800;
  letter-spacing: 0;
}

.sv-header-search,
.sv-header-action-icon {
  width: 44px;
  height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  color: #07133b;
  background: #f5f7ff;
  border: 1px solid rgba(226, 232, 240, .9);
  text-decoration: none;
  transition: background .2s ease, color .2s ease, transform .2s ease;
}

.sv-header-action-icon {
  padding: 0;
  font: inherit;
  font-size: 13px;
  font-weight: 800;
  cursor: pointer;
}

.sv-header-search:hover,
.sv-header-search:focus-visible,
.sv-header-action-icon:hover,
.sv-header-action-icon:focus-visible {
  color: var(--sv-primary);
  background: #eef2ff;
  transform: translateY(-1px);
}

.sv-header-right .sv-btn-primary {
  min-height: 44px;
  padding: 0 22px;
  border-radius: 10px;
  background: linear-gradient(135deg, #2563eb, #7047eb);
  box-shadow: 0 14px 28px rgba(37, 99, 235, .22);
}

.sv-main-nav--premium {
  width: 100%;
}

.sv-primary-menu--premium {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: clamp(16px, 2.1vw, 34px);
  margin: 0;
  padding: 0;
  list-style: none;
}

.sv-primary-menu--premium > .sv-menu-item {
  position: relative;
}

.sv-menu-link--root {
  min-height: 76px;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  position: relative;
  color: #07133b;
  font-size: 15px;
  font-weight: 700;
  line-height: 1;
  text-decoration: none;
  white-space: nowrap;
  transition: color .2s ease;
}

.sv-menu-link--root::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  width: 0;
  height: 3px;
  margin: 0 auto;
  border-radius: 999px;
  background: linear-gradient(90deg, #2563eb, #7047eb);
  transition: width .22s ease;
}

.sv-menu-link--root:hover,
.sv-menu-link--root:focus-visible,
.sv-menu-link--root.is-active,
.sv-menu-item.is-open > .sv-menu-link--root {
  color: var(--sv-primary);
}

.sv-menu-link--root:hover::after,
.sv-menu-link--root:focus-visible::after,
.sv-menu-link--root.is-active::after,
.sv-menu-item.is-open > .sv-menu-link--root::after {
  width: 100%;
}

.has-mega-trigger::before {
  content: "";
  width: 7px;
  height: 7px;
  order: 2;
  border-right: 2px solid currentColor;
  border-bottom: 2px solid currentColor;
  transform: translateY(-2px) rotate(45deg);
  transition: transform .2s ease;
}

.sv-menu-item.is-open > .has-mega-trigger::before {
  transform: translateY(1px) rotate(225deg);
}

.sv-mega-menu {
  position: absolute;
  top: 100%;
  left: 50%;
  width: min(1380px, calc(100vw - 40px));
  display: grid;
  grid-template-columns: 330px minmax(460px, 1fr) 360px;
  gap: 20px;
  padding: 28px 24px;
  background: rgba(255, 255, 255, .98);
  border: 1px solid #e5eaf3;
  border-radius: 18px;
  box-shadow: 0 28px 80px rgba(15, 23, 42, .14);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transform: translateX(-50%) translateY(10px);
  transition: opacity .22s ease, transform .22s ease, visibility .22s ease;
  z-index: 9999;
}

.has-mega-menu:hover > .sv-mega-menu,
.has-mega-menu:focus-within > .sv-mega-menu,
.has-mega-menu.is-open > .sv-mega-menu {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transform: translateX(-50%) translateY(0);
}

.sv-mega-menu__left {
  border-right: 1px solid #edf2f7;
  padding-right: 20px;
}

.sv-mega-menu__center {
  min-width: 0;
  transition: opacity .18s ease;
}

.sv-mega-menu__right {
  border-left: 1px solid #edf2f7;
  padding-left: 20px;
  transition: opacity .18s ease;
}

.sv-mega-menu.is-loading .sv-mega-menu__center,
.sv-mega-menu.is-loading .sv-mega-menu__right {
  opacity: .58;
}

.sv-mega-section {
  min-width: 0;
}

.sv-mega-section__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin: 0 0 16px;
}

.sv-mega-section__header h3,
.sv-mega-right__heading h3 {
  margin: 0;
  color: #07133b;
  font-size: 12px;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: .1em;
}

.sv-mega-section__header a,
.sv-mega-right__heading a {
  color: var(--sv-primary);
  font-size: 13px;
  font-weight: 800;
  text-transform: none;
  letter-spacing: 0;
  text-decoration: none;
}

.sv-mega-category-list {
  display: grid;
  gap: 8px;
}

.sv-mega-category {
  display: grid;
  grid-template-columns: 38px minmax(0, 1fr) auto 16px;
  align-items: center;
  gap: 12px;
  min-height: 52px;
  padding: 8px 10px;
  border: 1px solid transparent;
  border-radius: 8px;
  color: #07133b;
  text-decoration: none;
  transition: background .18s ease, border-color .18s ease, color .18s ease, transform .18s ease;
}

.sv-mega-category:hover,
.sv-mega-category:focus-visible,
.sv-mega-category.is-active {
  color: #003af2;
  background: #eef4ff;
  border-color: #dbe6ff;
  transform: translateX(2px);
  outline: none;
}

.sv-mega-category__icon {
  width: 30px;
  height: 30px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  border-radius: 7px;
  background: #eef4ff;
  color: #0047ff;
  font-size: 13px;
  font-weight: 800;
}

.sv-mega-category.is-active .sv-mega-category__icon,
.sv-mega-category:hover .sv-mega-category__icon,
.sv-mega-category:focus-visible .sv-mega-category__icon {
  color: #fff;
  background: #0b52ff;
}

.sv-mega-category__icon img {
  width: 18px;
  height: 18px;
  object-fit: contain;
}

.sv-mega-category__content {
  min-width: 0;
  display: grid;
  gap: 2px;
}

.sv-mega-category__content strong {
  color: #07133b;
  overflow: hidden;
  font-size: 14px;
  line-height: 1.2;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.sv-mega-category__content small {
  color: #5f6b85;
  overflow: hidden;
  font-size: 12px;
  line-height: 1.35;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.sv-mega-category__count {
  min-width: 46px;
  padding: 4px 8px;
  border-radius: 999px;
  color: #0b52ff;
  background: #eef2f7;
  font-size: 12px;
  font-weight: 800;
  text-align: center;
}

.sv-mega-category__arrow,
.sv-mega-article__arrow {
  color: #42526b;
  font-size: 22px;
  line-height: 1;
}

.sv-mega-feature-card {
  min-height: 580px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 260px;
  grid-template-rows: auto auto auto 1fr;
  gap: 22px 28px;
  overflow: hidden;
  position: relative;
  padding: 44px 36px;
  border-radius: 12px;
  background: linear-gradient(135deg, #eff6ff, #f8fbff);
}

.sv-mega-eyebrow {
  display: inline-flex;
  margin-bottom: 10px;
  color: var(--sv-primary);
  font-size: 12px;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: .08em;
}

.sv-mega-feature-card h3 {
  margin: 0 0 10px;
  color: #07133b;
  font-size: 30px;
  line-height: 1.15;
  letter-spacing: 0;
}

.sv-mega-feature-card p {
  max-width: 48ch;
  margin: 0;
  color: #46536b;
  font-size: 16px;
  line-height: 1.75;
}

.sv-mega-feature-card__visual {
  grid-column: 2;
  grid-row: 1 / span 2;
  min-height: 230px;
  display: grid;
  place-items: center;
  position: relative;
}

.sv-mega-feature-card__visual img {
  max-width: 100%;
  max-height: 230px;
  object-fit: contain;
}

.sv-mega-visual-shape {
  width: 190px;
  height: 170px;
  display: block;
  border: 6px solid #fff;
  border-radius: 28px;
  background: linear-gradient(135deg, #b48cff, #005af0);
  box-shadow: 0 20px 45px rgba(37, 99, 235, .18);
}

.sv-mega-visual-chip {
  position: absolute;
  width: 64px;
  height: 64px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 12px;
  color: #2f6df6;
  background: #fff;
  box-shadow: 0 12px 28px rgba(15, 23, 42, .1);
  font-size: 24px;
}

.sv-mega-visual-chip--left {
  left: 8px;
  bottom: 30px;
}

.sv-mega-visual-chip--right {
  right: 6px;
  top: 82px;
}

.sv-mega-feature-card__stats {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border-top: 1px solid #dde7f6;
  border-bottom: 1px solid #dde7f6;
}

.sv-mega-stat {
  padding: 22px 18px;
  border-right: 1px solid #dde7f6;
}

.sv-mega-stat:last-child {
  border-right: 0;
}

.sv-mega-stat strong {
  display: block;
  color: #0047ff;
  font-size: 24px;
  line-height: 1;
}

.sv-mega-stat span {
  display: block;
  margin-top: 8px;
  color: #45546f;
  font-size: 14px;
}

.sv-mega-feature-card__tags {
  grid-column: 1 / -1;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.sv-mega-feature-card__tags span {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 16px;
  border: 1px solid #d8e1ee;
  border-radius: 999px;
  color: #14223b;
  background: rgba(255, 255, 255, .76);
  font-size: 14px;
  font-weight: 750;
}

.sv-mega-feature-card__cta {
  align-self: end;
  justify-self: start;
  min-height: 46px;
  padding: 0 20px;
  border-radius: 8px;
  text-decoration: none;
}

.sv-mega-right {
  display: grid;
  gap: 22px;
}

.sv-mega-right__section + .sv-mega-right__section {
  padding-top: 22px;
  border-top: 1px solid #e5eaf3;
}

.sv-mega-right__heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 14px;
}

.sv-mega-article-list {
  display: grid;
  gap: 8px;
}

.sv-mega-article,
.sv-mega-latest {
  display: grid;
  align-items: center;
  gap: 12px;
  color: #07133b;
  text-decoration: none;
}

.sv-mega-article {
  grid-template-columns: 42px minmax(0, 1fr) 14px;
  min-height: 56px;
}

.sv-mega-latest {
  grid-template-columns: 42px minmax(0, 1fr) auto;
  min-height: 48px;
}

.sv-mega-article__icon,
.sv-mega-latest__thumb {
  width: 40px;
  height: 40px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  border-radius: 8px;
  color: #0b52ff;
  background: #eef4ff;
}

.sv-mega-article__icon img,
.sv-mega-latest__thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.sv-mega-article__body,
.sv-mega-latest__body {
  min-width: 0;
  display: grid;
  gap: 3px;
}

.sv-mega-article strong,
.sv-mega-latest strong {
  overflow: hidden;
  color: #07133b;
  font-size: 14px;
  line-height: 1.35;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.sv-mega-article small,
.sv-mega-latest small {
  overflow: hidden;
  color: #52617d;
  font-size: 12px;
  line-height: 1.35;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.sv-mega-latest small {
  justify-self: start;
  padding: 3px 8px;
  border-radius: 999px;
  color: #149b27;
  background: #dff7df;
  font-size: 11px;
  font-weight: 800;
}

.sv-mega-empty {
  margin: 8px 0 0;
  color: #64748b;
  font-size: 13px;
  line-height: 1.5;
}

.sv-dropdown {
  display: grid;
  gap: 4px;
  min-width: 230px;
  padding: 10px;
  margin: 0;
  list-style: none;
  border: 1px solid rgba(226, 232, 240, .95);
  border-radius: 14px;
  background: #fff;
  box-shadow: 0 24px 50px rgba(15, 23, 42, .1);
}

.sv-dropdown__link {
  display: block;
  padding: 10px 12px;
  border-radius: 10px;
  color: #07133b;
  font-size: 14px;
  font-weight: 650;
  text-decoration: none;
}

.sv-dropdown__link:hover,
.sv-dropdown__link:focus-visible {
  color: var(--sv-primary);
  background: #f2f5ff;
}

@media (max-width: 1190px) {
  .sv-primary-menu--premium {
    gap: 18px;
  }

  .sv-menu-link--root {
    font-size: 14px;
  }

  .sv-header-left,
  .sv-header-right {
    min-width: 150px;
  }
}

@media (max-width: 1023px) {
  .sv-header-wrapper {
    min-height: 70px;
  }

  .sv-header-center {
    display: none;
  }

  .sv-header-left,
  .sv-header-right {
    min-width: 0;
  }

  .sv-header-right .sv-btn-primary,
  .sv-header-search,
  .sv-header-action-icon {
    display: none;
  }

  .sv-primary-menu--premium {
    display: grid;
    gap: 0;
    width: 100%;
    justify-content: stretch;
  }

  .sv-primary-menu--premium > .sv-menu-item {
    position: relative;
    border-bottom: 1px solid #eef2f7;
  }

  .sv-menu-link--root {
    min-height: 54px;
    width: 100%;
    justify-content: space-between;
    padding: 0 4px;
  }

  .sv-menu-link--root::after {
    display: none;
  }

  .sv-mega-menu {
    position: static;
    width: 100%;
    display: grid;
    grid-template-columns: 1fr;
    gap: 14px;
    padding: 0;
    border: 0;
    border-radius: 0;
    box-shadow: none;
    max-height: 0;
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transform: none;
    overflow: hidden;
    transition: max-height .28s ease;
  }

  .sv-menu-item.is-open > .sv-mega-menu {
    max-height: 1800px;
    transform: none;
  }

  .sv-mega-menu__left,
  .sv-mega-menu__right {
    border: 0;
    padding: 0;
  }

  .sv-mega-menu__center {
    min-width: 0;
  }

  .sv-mega-feature-card {
    min-height: 0;
    grid-template-columns: 1fr;
    padding: 18px;
    border-radius: 14px;
  }

  .sv-mega-feature-card__visual {
    grid-column: 1;
    grid-row: auto;
    min-height: 150px;
  }

  .sv-mega-feature-card__stats {
    grid-template-columns: repeat(2, 1fr);
  }

  .sv-mega-stat:nth-child(2n) {
    border-right: 0;
  }

  .sv-mega-feature-card h3 {
    font-size: 24px;
  }
}