/* ===== Header ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.82);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-subtle);
}

.header-inner {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 1.5rem;
  min-height: 72px;
}

.brand {
  justify-self: start;
  display: inline-flex;
  align-items: center;
  gap: 0.625rem;
  color: var(--text-strong);
  font-weight: 700;
  font-size: 1.125rem;
  letter-spacing: -0.02em;
}

.brand-name {
  font-weight: 800;
}

.brand-logo {
  width: 32px;
  height: 32px;
  object-fit: contain;
  flex-shrink: 0;
}

.site-nav {
  justify-self: center;
  display: flex;
  align-items: center;
  gap: 0.125rem;
}

.nav-link {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.5rem 0.875rem;
  border-radius: var(--radius-pill);
  color: var(--text-secondary);
  font-size: 0.9375rem;
  font-weight: 500;
  white-space: nowrap;
  transition: color 0.2s var(--ease), background 0.2s var(--ease);
}

.nav-dropdown-trigger {
  cursor: pointer;
  border: none;
  background: none;
  font-family: inherit;
  letter-spacing: inherit;
}

.nav-chevron {
  font-size: 0.625rem;
  opacity: 0.65;
  transition: transform 0.2s var(--ease);
}

.nav-dropdown.is-open .nav-chevron,
.nav-dropdown-trigger[aria-expanded="true"] .nav-chevron {
  transform: rotate(180deg);
}

.nav-dropdown.is-open .nav-dropdown-trigger,
.nav-link:hover,
.nav-link.is-active {
  color: var(--text-strong);
  background: var(--surface-muted);
}

.nav-dropdown.is-open .nav-dropdown-trigger {
  color: var(--accent);
}

.nav-dropdown {
  position: relative;
}

/* 透明桥接层：填补触发按钮与下拉面板之间的空隙，避免 mouseleave 误触发 */
.nav-dropdown::before {
  content: "";
  position: absolute;
  left: -0.5rem;
  right: -0.5rem;
  top: 100%;
  height: 0.75rem;
  display: none;
}

.nav-dropdown.is-open::before {
  display: block;
}

.nav-dropdown-panel {
  display: none;
  position: absolute;
  top: calc(100% + 0.5rem);
  left: 50%;
  transform: translateX(-50%);
  min-width: 280px;
  padding: 0.75rem;
  border-radius: var(--radius-lg);
  background: var(--surface-card);
  border: 1px solid var(--border-soft);
  box-shadow: var(--shadow-floating);
  z-index: 200;
  pointer-events: auto;
}

.nav-dropdown-panel--cols {
  display: none;
  grid-template-columns: 1fr 1fr;
  gap: 0.25rem 1.5rem;
  min-width: 520px;
  padding: 1rem 1.25rem;
}

.nav-dropdown.is-open > .nav-dropdown-panel:not(.nav-dropdown-panel--cols) {
  display: block;
}

.nav-dropdown.is-open > .nav-dropdown-panel--cols {
  display: grid;
}

.dropdown-col {
  display: flex;
  flex-direction: column;
  gap: 0.125rem;
}

.dropdown-item {
  display: block;
  padding: 0.625rem 0.75rem;
  border-radius: var(--radius-sm);
  transition: background 0.2s var(--ease);
}

.dropdown-item:hover {
  background: var(--surface-muted);
}

.dropdown-title {
  display: block;
  color: var(--text-strong);
  font-size: 0.9375rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  line-height: 1.4;
}

.dropdown-desc {
  display: block;
  margin-top: 0.2rem;
  color: var(--text-secondary);
  font-size: 0.8125rem;
  line-height: 1.5;
  white-space: normal;
}

.header-actions {
  justify-self: end;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.header-cta {
  padding-left: 1.25rem;
  padding-right: 1.25rem;
}

.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  color: var(--text-strong);
  font-size: 1.125rem;
}

.nav-toggle:hover {
  background: var(--surface-muted);
}

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

.section--muted {
  background: var(--surface-muted);
}

.section--tech {
  background: var(--surface-section);
  background-image: radial-gradient(circle at 1px 1px, rgba(0, 0, 0, 0.04) 1px, transparent 0);
  background-size: 18px 18px;
}

/* ===== Brand Promo ===== */
.brand-promo {
  padding-top: clamp(3rem, 8vw, 5rem);
  padding-bottom: clamp(2rem, 5vw, 3.5rem);
  text-align: center;
}

.brand-promo-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: clamp(2rem, 5vw, 3rem);
}

.brand-promo-copy {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
}

.brand-promo-name {
  margin: 0;
  color: var(--text-strong);
  font-size: clamp(3rem, 8vw, 4.5rem);
  font-weight: 800;
  letter-spacing: 0.1em;
  line-height: 1;
}

.brand-promo-tagline {
  margin: 0;
  color: var(--text-secondary);
  font-size: clamp(1.0625rem, 2.2vw, 1.25rem);
  font-weight: 500;
  letter-spacing: 0.04em;
  line-height: 1.65;
}

.brand-promo-visual {
  width: 100%;
  max-width: 960px;
}

.brand-promo-visual img {
  width: 100%;
  border-radius: var(--radius-xl);
  border: 1px solid var(--border-soft);
  box-shadow: var(--shadow-floating);
}

/* ===== Hero ===== */
.hero {
  padding-top: clamp(2rem, 5vw, 3rem);
  padding-bottom: clamp(4rem, 10vw, 6rem);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(2rem, 5vw, 4rem);
  align-items: center;
}

.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  margin: 0 0 1.25rem;
  padding: 0.35rem 0.875rem;
  border-radius: var(--radius-pill);
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 0.8125rem;
  font-weight: 600;
}

.hero-title {
  margin: 0 0 1.25rem;
  color: var(--text-strong);
  font-size: clamp(1.75rem, 3vw, 2.25rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.2;
}

.hero-desc {
  margin: 0 0 2rem;
  max-width: 32rem;
  color: var(--text-secondary);
  font-size: 1.0625rem;
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.875rem;
}

.hero-visual img {
  width: 100%;
  max-width: 480px;
  margin-left: auto;
}

/* ===== Ecosystem ===== */
.ecosystem .section-title {
  margin-bottom: 3rem;
}

.eco-rows {
  display: flex;
  flex-direction: column;
  gap: clamp(3rem, 6vw, 5rem);
}

.eco-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(2rem, 4vw, 3.5rem);
  align-items: center;
}

.eco-row--reverse .eco-text {
  order: 2;
}

.eco-row--reverse .eco-visual {
  order: 1;
}

.eco-title {
  margin: 0 0 1rem;
  color: var(--text-strong);
  font-size: clamp(1.375rem, 2.5vw, 1.75rem);
  font-weight: 700;
  letter-spacing: -0.025em;
}

.eco-desc {
  margin: 0 0 1.25rem;
  color: var(--text-secondary);
  font-size: 1rem;
  line-height: 1.75;
}

.eco-visual img {
  width: 100%;
  max-width: 420px;
}

.eco-row .eco-visual img {
  margin-left: auto;
}

.eco-row--reverse .eco-visual img {
  margin-left: 0;
  margin-right: auto;
}

/* ===== Products ===== */
.products .section-title {
  margin-bottom: 3rem;
}

.product-layout {
  display: grid;
  grid-template-columns: 140px 1fr;
  gap: 2.5rem;
  align-items: start;
}

.product-tabs {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  border-right: 1px solid var(--border-default);
  padding-right: 1.5rem;
}

.product-tab {
  position: relative;
  display: block;
  width: 100%;
  padding: 0.75rem 0;
  border: none;
  border-radius: 0;
  background: none;
  color: var(--text-secondary);
  font-size: 0.9375rem;
  font-weight: 500;
  text-align: left;
  cursor: pointer;
  transition: color 0.2s var(--ease);
}

.product-tab:hover {
  color: var(--text-strong);
}

.product-tab.is-active {
  color: var(--accent);
  font-weight: 600;
  background: none;
  box-shadow: none;
}

.product-tab.is-active::after {
  content: "";
  position: absolute;
  top: 50%;
  right: -1.5rem;
  width: 2px;
  height: 1.125rem;
  background: var(--accent);
  transform: translateY(-50%);
}

.product-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
}

.product-card {
  padding: 1.25rem 1.375rem;
  border-radius: var(--radius-lg);
  background: var(--surface-card);
  border: 1px solid var(--border-soft);
  box-shadow: none;
  transition: box-shadow 0.25s var(--ease), border-color 0.25s var(--ease);
}

.product-card:hover {
  border-color: var(--border-default);
  box-shadow: var(--shadow-card);
  transform: none;
}

.product-card.is-hidden {
  display: none;
}

.product-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  margin-bottom: 1rem;
  border-radius: 50%;
  background: var(--surface-muted);
  color: var(--text-secondary);
  font-size: 1rem;
}

.product-name {
  margin: 0 0 0.5rem;
  color: var(--text-strong);
  font-size: 1.0625rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.product-desc {
  margin: 0;
  color: var(--text-secondary);
  font-size: 0.875rem;
  line-height: 1.65;
}

/* ===== Value ===== */
.value-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(2rem, 5vw, 4rem);
  align-items: center;
}

.value-title {
  margin: 0 0 1.25rem;
  color: var(--text-strong);
  font-size: clamp(1.75rem, 3vw, 2.25rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.25;
}

.value-desc {
  margin: 0 0 1.5rem;
  color: var(--text-secondary);
  font-size: 1rem;
  line-height: 1.75;
}

.value-visual img {
  width: 100%;
  max-width: 640px;
  margin-left: auto;
}

/* ===== Architecture ===== */
.arch-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(2rem, 5vw, 4rem);
  align-items: center;
}

.arch-title {
  margin: 0 0 1rem;
  color: var(--text-strong);
  font-size: clamp(1.75rem, 3vw, 2.25rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.25;
}

.arch-desc {
  margin: 0 0 2.5rem;
  color: var(--text-secondary);
  font-size: 1rem;
  line-height: 1.75;
}

.stats-row {
  display: flex;
  gap: clamp(1.5rem, 4vw, 3rem);
  margin: 0;
}

.stat-item {
  margin: 0;
}

.stat-value {
  margin: 0 0 0.25rem;
  color: var(--text-strong);
  font-size: clamp(1.75rem, 3vw, 2.5rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1;
}

.stat-label {
  margin: 0;
  color: var(--text-secondary);
  font-size: 0.875rem;
}

.arch-visual img {
  width: 100%;
  max-width: 440px;
  margin-left: auto;
}

/* ===== Partners ===== */
.partners .section-title {
  margin-bottom: 3rem;
}

.partner-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 1rem;
}

.partner-card {
  display: flex;
  flex-direction: row;
  align-items: center;
  gap: 0.625rem;
  padding: 0.875rem 1rem;
  min-height: 56px;
  border-radius: var(--radius-lg);
  background: var(--surface-card);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  font-size: 0.8125rem;
  font-weight: 500;
  line-height: 1.35;
  transition: background 0.2s var(--ease), box-shadow 0.2s var(--ease);
}

.partner-card__icon {
  display: flex;
  flex-shrink: 0;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--surface-muted);
  color: var(--text-muted);
  font-size: 0.875rem;
}

.partner-card:hover {
  box-shadow: var(--shadow-card);
  color: var(--text-strong);
}

/* ===== News ===== */
.news .section-subtitle {
  margin-bottom: 2.5rem;
}

.news-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.news-card {
  border-radius: var(--radius-xl);
  background: var(--surface-card);
  border: 1px solid var(--border-soft);
  box-shadow: var(--shadow-card);
  overflow: hidden;
  transition: box-shadow 0.25s var(--ease), transform 0.25s var(--ease);
}

.news-card:hover {
  box-shadow: var(--shadow-hover);
  transform: translateY(-3px);
}

.news-thumb {
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: var(--surface-muted);
}

.news-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.news-body {
  padding: 1.25rem 1.5rem 1.5rem;
}

.news-title {
  margin: 0 0 0.625rem;
  color: var(--text-strong);
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.4;
}

.news-excerpt {
  margin: 0 0 1rem;
  color: var(--text-secondary);
  font-size: 0.875rem;
  line-height: 1.6;
}

.news-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.news-meta time {
  color: var(--text-muted);
  font-size: 0.8125rem;
}

.news-meta .link-arrow {
  font-size: 0.8125rem;
}

/* ===== Footer ===== */
.site-footer {
  background: var(--surface-muted);
  border-top: 1px solid var(--border-subtle);
  padding-top: 4rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.2fr 1.8fr;
  gap: 3rem;
  padding-bottom: 3rem;
}

.footer-tagline {
  margin: 1rem 0 1.5rem;
  max-width: 16rem;
  color: var(--text-secondary);
  font-size: 0.9375rem;
  line-height: 1.65;
}

.social-links {
  display: flex;
  gap: 1rem;
}

.social-links a {
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-strong);
  font-size: 1.125rem;
  transition: color 0.2s var(--ease), opacity 0.2s var(--ease);
}

.social-links a:hover {
  color: var(--accent);
  opacity: 0.85;
}

.social-icon {
  display: block;
  width: 1.125rem;
  height: 1.125rem;
  flex-shrink: 0;
}

.footer-nav {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

.footer-heading {
  margin: 0 0 1rem;
  color: var(--text-strong);
  font-size: 0.875rem;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.footer-col {
  display: flex;
  flex-direction: column;
  gap: 0.625rem;
}

.footer-col a {
  color: var(--text-secondary);
  font-size: 0.875rem;
  transition: color 0.2s var(--ease);
}

.footer-col a:hover {
  color: var(--text-strong);
}

.footer-col--learn .footer-heading {
  margin-bottom: 1rem;
}

.footer-learn-cols {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.625rem 2rem;
}

.footer-learn-col {
  display: flex;
  flex-direction: column;
  gap: 0.625rem;
}

.footer-legal {
  border-top: 1px solid var(--border-default);
  padding: 1.5rem 0 1.25rem;
  text-align: center;
}

.footer-legal__item {
  margin: 0 0 1rem;
  color: var(--text-muted);
  font-size: 0.75rem;
  line-height: 1.75;
}

.footer-legal__link {
  margin-left: 0.35rem;
  color: var(--accent);
  font-size: 0.75rem;
  font-weight: 600;
  white-space: nowrap;
  transition: color 0.2s var(--ease);
}

.footer-legal__link:hover {
  color: var(--accent-hover);
}

.footer-legal__copyright {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.75rem;
}

/* ===== Region Modal ===== */
.region-modal {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.25rem;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity 0.25s var(--ease), visibility 0.25s var(--ease);
}

.region-modal.is-open {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
}

.region-modal__overlay {
  position: absolute;
  inset: 0;
  background: rgba(15, 23, 42, 0.45);
}

.region-modal__panel {
  position: relative;
  width: 100%;
  max-width: 420px;
  padding: 2rem 1.75rem 1.75rem;
  border-radius: var(--radius-xl);
  background: var(--surface-card);
  box-shadow: var(--shadow-floating);
  text-align: center;
}

.region-modal__icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 56px;
  height: 56px;
  margin: 0 auto 1.25rem;
  border-radius: 50%;
  background: #f97316;
  color: #fff;
  font-size: 1.375rem;
  font-weight: 700;
}

.region-modal__title {
  margin: 0 0 1rem;
  color: var(--text-strong);
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.region-modal__desc {
  margin: 0 0 1.5rem;
  color: var(--text-secondary);
  font-size: 0.9375rem;
  line-height: 1.75;
}

.region-modal__btn {
  width: 100%;
  min-height: 48px;
  border-radius: var(--radius-pill);
  font-size: 1rem;
}

body.modal-open {
  overflow: hidden;
}

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  .hero-grid,
  .eco-row,
  .value-grid,
  .arch-grid {
    grid-template-columns: 1fr;
  }

  .eco-row--reverse .eco-text,
  .eco-row--reverse .eco-visual {
    order: unset;
  }

  .hero-visual img,
  .eco-visual img,
  .value-visual img,
  .arch-visual img {
    margin-left: auto;
    margin-right: auto;
  }

  .product-layout {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }

  .product-tabs {
    flex-direction: row;
    flex-wrap: wrap;
    gap: 0.5rem 1.25rem;
    border-right: none;
    padding-right: 0;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border-default);
  }

  .product-tab {
    width: auto;
    padding: 0.5rem 0;
  }

  .product-tab.is-active::after {
    top: auto;
    bottom: -1rem;
    right: auto;
    left: 0;
    width: 100%;
    height: 2px;
    transform: none;
  }

  .product-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .partner-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .news-grid {
    grid-template-columns: 1fr;
  }

  .footer-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 900px) {
  .header-inner {
    display: flex;
    justify-content: space-between;
  }

  .site-nav {
    justify-self: auto;
  }

  .header-actions {
    justify-self: auto;
  }

  .site-nav {
    display: none;
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    padding: 1rem var(--container-padding) 1.5rem;
    background: rgba(255, 255, 255, 0.96);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-subtle);
  }

  .site-nav.is-open {
    display: flex;
  }

  .nav-link {
    width: 100%;
    padding: 0.75rem 1rem;
    justify-content: space-between;
  }

  .nav-dropdown {
    width: 100%;
  }

  .nav-dropdown-trigger {
    width: 100%;
  }

  .nav-dropdown-panel,
  .nav-dropdown-panel--cols {
    position: static;
    transform: none;
    min-width: 0;
    width: 100%;
    margin-top: 0.25rem;
    box-shadow: none;
    border: 1px solid var(--border-subtle);
  }

  .nav-dropdown-panel--cols {
    grid-template-columns: 1fr;
  }

  .nav-dropdown:not(.is-open) .nav-dropdown-panel,
  .nav-dropdown:not(.is-open) .nav-dropdown-panel--cols {
    display: none;
  }

  .nav-toggle {
    display: inline-flex;
  }

  .header-cta {
    display: none;
  }

  .site-header {
    position: relative;
  }

  .product-grid {
    grid-template-columns: 1fr;
  }

  .stats-row {
    flex-wrap: wrap;
  }

  .footer-nav {
    grid-template-columns: 1fr 1fr;
  }
}

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

  .footer-learn-cols {
    grid-template-columns: 1fr;
  }

  .footer-nav {
    grid-template-columns: 1fr;
  }
}