/* ============================================================
   ACPOWER Website Styles
   ============================================================ */

:root {
  --color-dark: #232221;
  --color-navy: #595757;
  --color-primary: #a40000;
  --color-primary-light: #c92a1f;
  --color-primary-soft: #e98d7a;
  --color-primary-pale: #f4d2cb;
  --color-text: #3a3432;
  --color-text-light: #6f6966;
  --color-white: #ffffff;
  --color-bg-light: #f6f2ef;
  --color-card-bg: #ffffff;
  --color-border: #ddd5d0;
  --color-surface-muted: #f1ece8;
  --color-surface-strong: #4b4848;
  --color-shadow: rgba(22, 16, 15, 0.12);
  --color-shadow-strong: rgba(22, 16, 15, 0.2);
  --color-dark-glass: rgba(37, 35, 35, 0.95);
  --color-dark-glass-strong: rgba(42, 36, 34, 0.97);
  --color-light-glass: rgba(255, 255, 255, 0.72);
  --color-light-glass-soft: rgba(255, 255, 255, 0.52);
  --color-light-glass-faint: rgba(255, 255, 255, 0.4);
  --color-light-panel: rgba(255, 255, 255, 0.04);
  --color-light-border: rgba(255, 255, 255, 0.1);
  --color-glow: rgba(164, 0, 0, 0.18);
  --color-glow-soft: rgba(201, 42, 31, 0.16);
  --color-hero-bg: #2a2a2a;
  --color-hero-bg-edge: #000000;
  --color-hero-glow: rgba(255, 255, 255, 0.18);
  --color-hero-glow-soft: rgba(255, 255, 255, 0.24);
  --nav-height: 72px;
  --container-width: 1200px;
  --transition: 0.3s ease;
}

/* --- Reset --- */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; font-size: 16px; }
html::before {
  content: "";
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-primary-light));
  transform: scaleX(0);
  transform-origin: left center;
  opacity: 0;
  pointer-events: none;
  z-index: 2200;
  transition: transform 220ms ease, opacity 220ms ease;
}

html.page-nav-loading::before {
  transform: scaleX(var(--page-load-progress, 0.24));
  opacity: 1;
}

html.page-nav-finishing::before {
  transform: scaleX(1);
  opacity: 0;
  transition: transform 180ms ease-out, opacity 220ms ease 120ms;
}

body {
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI",
    "PingFang SC", "Noto Sans SC", "Microsoft YaHei",
    "Helvetica Neue", Arial, sans-serif;
  color: var(--color-text);
  background: var(--color-white);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

html[data-lang="en"]:not(.i18n-ready) [data-i18n] {
  visibility: hidden;
}

html.page-enter-pending body {
  opacity: 0.96;
}

html.page-enter-active body {
  opacity: 1;
  transition: opacity 320ms ease;
}

a { text-decoration: none; color: inherit; }
img { max-width: 100%; display: block; }
button { border: none; background: none; cursor: pointer; font: inherit; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  html::before,
  html.page-nav-finishing::before,
  html.page-nav-loading::before,
  html.page-enter-active body {
    transition: none;
  }

  html.page-enter-pending body,
  html.page-enter-active body {
    opacity: 1;
  }
}

.container {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 clamp(20px, 4vw, 40px);
}

/* ============================================================
   Navigation
   ============================================================ */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  transition: background var(--transition), box-shadow var(--transition);
}

.nav--solid {
  background: var(--color-dark-glass);
  backdrop-filter: blur(12px);
  box-shadow: 0 1px 20px var(--color-shadow-strong);
}

.nav__inner {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 40px;
  height: var(--nav-height);
  display: grid;
  grid-template-columns: auto minmax(480px, 600px) auto;
  align-items: center;
  gap: clamp(20px, 2.5vw, 48px);
}

.nav__logo {
  display: flex;
  align-items: center;
  flex-shrink: 0;
}

.nav__logo-lockup {
  display: flex;
  align-items: center;
  gap: 16px;
}

.nav__logo-lockup picture,
.footer__logo picture {
  display: block;
}

.brand-logo {
  display: block;
  width: auto;
  height: auto;
  max-width: 100%;
}

.brand-logo--nav {
  filter: brightness(0) invert(1);
}

.brand-logo--nav-en {
  height: 15px;
}

.brand-logo--nav-cn {
  height: 19px;
}

.brand-logo--footer {
  height: 42px;
  filter: brightness(0) invert(1);
  opacity: 0.94;
}

.footer__logo-lockup {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 4px;
}

html[data-lang="en"] .footer__logo-lockup {
  flex-direction: row;
  align-items: center;
  gap: 18px;
}

.brand-logo--footer-cn {
  width: 112px;
  height: auto;
  filter: brightness(0) invert(1);
  opacity: 0.94;
}

.brand-logo--footer-en {
  width: 112px;
  height: auto;
  filter: brightness(0) invert(1);
  opacity: 0.94;
}

html[data-lang="en"] .footer__logo-lockup > :first-child {
  order: 1;
}

html[data-lang="en"] .brand-logo--footer-en {
  width: auto;
  height: 20px;
}

html[data-lang="en"] .brand-logo--footer-cn {
  width: auto;
  height: 24px;
}

.nav__links {
  display: flex;
  width: 100%;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  margin: 0;
}

.nav__link {
  color: var(--color-light-glass);
  font-size: 15px;
  font-weight: 400;
  letter-spacing: 0.5px;
  transition: color var(--transition);
  position: relative;
}

.nav__link::after {
  content: "";
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-primary-light);
  transition: width var(--transition);
}

.nav__link:hover,
.nav__link--active {
  color: var(--color-white);
}

.nav__link--active::after,
.nav__link:hover::after {
  width: 100%;
}

.nav__actions {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-shrink: 0;
}

.nav__lang {
  color: var(--color-light-glass);
  font-size: 13px;
  letter-spacing: 1px;
  padding: 4px 12px;
  border: 1px solid var(--color-light-border);
  border-radius: 4px;
  transition: all var(--transition);
  cursor: pointer;
  background: none;
}

.nav__lang:hover {
  border-color: var(--color-light-glass-soft);
  color: var(--color-white);
}

.nav__lang-sep { opacity: 0.4; }
html[data-lang="zh"] .nav__lang-zh { opacity: 1; font-weight: 600; }
html[data-lang="zh"] .nav__lang-en { opacity: 0.45; }
html[data-lang="en"] .nav__lang-en { opacity: 1; font-weight: 600; }
html[data-lang="en"] .nav__lang-zh { opacity: 0.45; }

/* Hide decorative English subtitle on tech pillar chips when English is active */
html[data-lang="en"] .tech-pillar__en { display: none; }

/* English mode: nav shows only ACPOWER wordmark (hide Chinese) */
html[data-lang="en"] .brand-logo--nav-cn { display: none; }

.nav__hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  width: 24px;
  padding: 4px 0;
}

.nav__hamburger span {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--color-white);
  border-radius: 2px;
  transition: all var(--transition);
}

.nav__hamburger--open span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.nav__hamburger--open span:nth-child(2) {
  opacity: 0;
}
.nav__hamburger--open span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ============================================================
   Hero Section
   ============================================================ */
.hero {
  position: relative;
  width: 100%;
  height: 100vh;
  height: 100svh;  /* accounts for mobile browser chrome (address bar etc.) */
  min-height: 600px;
  background: radial-gradient(circle at center, var(--color-hero-bg) 0%, var(--color-hero-bg-edge) 100%);
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}

.hero--mp4 {
  background: var(--color-hero-bg);
}

.hero__tap-hint {
  position: absolute;
  bottom: 50%;
  left: 50%;
  transform: translate(-50%, 50%);
  z-index: 3;
  padding: 10px 24px;
  background: var(--color-dark-glass);
  backdrop-filter: blur(8px);
  color: var(--color-light-glass);
  font-size: 13px;
  letter-spacing: 2px;
  border-radius: 4px;
  pointer-events: none;
  animation: tapHintFade 2s ease-in-out infinite;
}

@keyframes tapHintFade {
  0%, 100% { opacity: 0.6; }
  50% { opacity: 1; }
}

.hero__video-wrap {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  padding-bottom: 15%;
}

.hero__poster {
  display: block;
  position: absolute;
  width: 80%;
  max-width: 880px;
  aspect-ratio: 16 / 9;
  background: center / contain no-repeat url("../images/hero-poster.webp");
  opacity: 1;
  transition: opacity 180ms ease;
}

.hero--video-ready .hero__poster {
  opacity: 0;
}

.hero__video {
  width: 80%;
  max-width: 880px;
  height: auto;
  opacity: 0;
  transition: opacity 180ms ease;
  filter: drop-shadow(0 0 60px var(--color-hero-glow));
}

.hero__video.hero__video--ready {
  opacity: 1;
}

.hero__video-bg {
  position: absolute;
  width: 50%;
  max-width: 550px;
  aspect-ratio: 16/9;
  background: radial-gradient(ellipse at center, var(--color-hero-glow-soft) 0%, transparent 68%);
  border-radius: 50%;
  filter: blur(60px);
  pointer-events: none;
}

.hero--mp4 .hero__video-bg {
  opacity: 0;
}

.hero--mp4 .hero__video {
  filter: none;
}

.hero::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 35%;
  background: linear-gradient(to bottom, transparent, var(--color-hero-bg-edge) 90%);
  z-index: 1;
  pointer-events: none;
}

.hero--mp4::after {
  background: none;
}

.hero__overlay {
  position: absolute;
  bottom: 120px;
  left: 0;
  right: 0;
  z-index: 2;
  text-align: center;
  color: var(--color-white);
  padding: 0 20px;
}

.hero__title {
  font-size: clamp(32px, 4.5vw, 54px);
  font-weight: 700;
  letter-spacing: clamp(2px, 0.4vw, 6px);
  line-height: 1.15;
  margin-bottom: 20px;
  text-shadow: 0 2px 30px rgba(0, 0, 0, 0.4);
}

.hero__dot {
  color: var(--color-primary-light);
  margin: 0 4px;
}

/* English hero title is ~2× longer than Chinese — shrink to avoid wrapping */
html[data-lang="en"] .hero__title {
  font-size: clamp(26px, 3.4vw, 42px);
  letter-spacing: clamp(1px, 0.2vw, 3px);
}

/* Hide mobile-only line break on desktop */
.hero__br-mobile { display: none; }

.hero__subtitle {
  font-size: clamp(13px, 1.4vw, 16px);
  font-weight: 300;
  letter-spacing: 2px;
  color: var(--color-light-glass);
  margin-bottom: 40px;
  text-transform: none;
}

.hero__cta {
  display: inline-block;
  padding: 14px 40px;
  font-size: 15px;
  font-weight: 500;
  letter-spacing: 2px;
  color: var(--color-white);
  background: var(--color-primary);
  border: 1.5px solid var(--color-primary);
  border-radius: 2px;
  transition: all var(--transition);
}

.hero__cta:hover {
  background: var(--color-primary-light);
  border-color: var(--color-primary-light);
}

.hero__scroll-hint {
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  z-index: 2;
}

.hero__scroll-text {
  font-size: 10px;
  letter-spacing: 3px;
  color: var(--color-light-glass-faint);
}

.hero__scroll-line {
  width: 1px;
  height: 40px;
  background: linear-gradient(to bottom, var(--color-light-glass-soft), transparent);
  animation: scrollPulse 2s ease-in-out infinite;
}

@keyframes scrollPulse {
  0%, 100% { opacity: 0.3; transform: scaleY(0.6); }
  50% { opacity: 1; transform: scaleY(1); }
}

/* ============================================================
   Credentials Strip
   ============================================================ */
.credentials {
  background: var(--color-dark);
  color: var(--color-white);
  padding: clamp(36px, 5vw, 56px) 0;
  border-bottom: 1px solid var(--color-light-border);
}
.credentials__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--color-light-border);
  border: 1px solid var(--color-light-border);
  border-radius: 2px;
  overflow: hidden;
}
.credentials__item {
  background: var(--color-dark);
  padding: clamp(20px, 2.5vw, 28px) clamp(16px, 2vw, 28px);
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.credentials__num {
  font-size: clamp(28px, 3vw, 36px);
  font-weight: 700;
  color: var(--color-primary-light);
  letter-spacing: 1px;
  line-height: 1;
}
.credentials__label {
  font-size: 13px;
  color: var(--color-light-glass);
  letter-spacing: 1.5px;
}
.credentials__sub {
  font-size: 11px;
  color: var(--color-light-glass-faint);
  letter-spacing: 0.5px;
  line-height: 1.5;
}
@media (max-width: 1024px) {
  .credentials__grid { grid-template-columns: repeat(2, 1fr); }
}

/* ============================================================
   Section Common
   ============================================================ */
.section-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: 48px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--color-border);
}

.section-header--light {
  border-bottom-color: var(--color-light-border);
}

.section-title {
  font-size: 32px;
  font-weight: 700;
  letter-spacing: 2px;
}

.section-more {
  font-size: 14px;
  color: var(--color-text-light);
  transition: color var(--transition);
  display: flex;
  align-items: center;
  gap: 4px;
}

.section-more:hover {
  color: var(--color-primary);
}

.section-more span {
  transition: transform var(--transition);
}

.section-more:hover span {
  transform: translateX(4px);
}

/* ============================================================
   Products Section — image-less editorial link list
   ============================================================ */
.products {
  padding: clamp(60px, 8vw, 100px) 0 clamp(80px, 9vw, 120px);
  background: var(--color-white);
}

.products__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  border-top: 1px solid var(--color-border);
}

.product-link {
  position: relative;
  display: grid;
  grid-template-columns: auto auto 1fr auto;
  align-items: center;
  gap: clamp(20px, 3vw, 44px);
  padding: clamp(28px, 3.6vw, 44px) clamp(8px, 1.4vw, 20px);
  border-bottom: 1px solid var(--color-border);
  color: var(--color-text);
  transition: background var(--transition), padding var(--transition);
}

.product-link::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 0;
  background: var(--color-primary);
  transition: width var(--transition);
}

.product-link:hover {
  background: var(--color-surface-muted);
  padding-left: clamp(20px, 2.4vw, 32px);
  padding-right: clamp(20px, 2.4vw, 32px);
}

.product-link:hover::before {
  width: 3px;
}

.product-link__num {
  font-family: "Inter", -apple-system, monospace;
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 2px;
  color: var(--color-text-light);
  align-self: flex-start;
  padding-top: 6px;
  min-width: 28px;
  transition: color var(--transition);
}

.product-link:hover .product-link__num {
  color: var(--color-primary);
}

.product-link__bar {
  width: 3px;
  height: 56px;
  background: var(--color-border);
  transition: background var(--transition), height var(--transition);
}

.product-link:hover .product-link__bar {
  background: var(--color-primary);
  height: 72px;
}

.product-link__body {
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.product-link__eyebrow {
  display: flex;
  align-items: baseline;
  gap: 14px;
  flex-wrap: wrap;
}

.product-link__code {
  font-family: "Inter", "SFMono-Regular", Consolas, monospace;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 3px;
  color: var(--color-primary);
}

.product-link__family {
  font-family: "Inter", sans-serif;
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 2.5px;
  text-transform: uppercase;
  color: var(--color-text-light);
}

.product-link__name {
  font-size: clamp(22px, 2.2vw, 28px);
  font-weight: 600;
  letter-spacing: 1.5px;
  line-height: 1.25;
  color: var(--color-text);
  margin: 0;
  transition: color var(--transition);
}

.product-link:hover .product-link__name {
  color: var(--color-dark);
}

.product-link__chips {
  list-style: none;
  margin: 2px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.product-link__chip {
  font-size: 11.5px;
  font-weight: 500;
  letter-spacing: 1px;
  color: var(--color-text-light);
  background: var(--color-surface-muted);
  padding: 5px 12px;
  border-radius: 2px;
  white-space: nowrap;
}

.product-link__chip--accent {
  color: var(--color-primary);
  background: var(--color-primary-pale);
}

.product-link:hover .product-link__chip {
  background: var(--color-white);
}

.product-link:hover .product-link__chip--accent {
  background: var(--color-primary-pale);
}

.product-link__scenes {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 2px;
}

.product-link__scenes-label {
  font-size: 10.5px;
  font-weight: 600;
  letter-spacing: 2px;
  color: var(--color-text-light);
  text-transform: uppercase;
  position: relative;
  padding-right: 14px;
}

.product-link__scenes-label::after {
  content: "";
  position: absolute;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 6px;
  height: 1px;
  background: var(--color-border);
}

.product-link__scenes-list {
  font-size: 13px;
  letter-spacing: 0.4px;
  color: var(--color-text-light);
  line-height: 1.6;
}

.product-link__cta {
  display: flex;
  align-items: center;
  gap: 14px;
  padding-left: clamp(12px, 2vw, 28px);
  color: var(--color-text-light);
  transition: color var(--transition);
}

.product-link:hover .product-link__cta {
  color: var(--color-primary);
}

.product-link__cta-label {
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 2px;
  text-transform: uppercase;
  opacity: 0;
  transform: translateX(8px);
  transition: opacity var(--transition), transform var(--transition);
}

.product-link:hover .product-link__cta-label {
  opacity: 1;
  transform: translateX(0);
}

.product-link__cta-arrow {
  font-size: 22px;
  line-height: 1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border: 1px solid var(--color-border);
  border-radius: 50%;
  transition: background var(--transition), border-color var(--transition), color var(--transition), transform var(--transition);
}

.product-link:hover .product-link__cta-arrow {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: var(--color-white);
  transform: translateX(4px);
}

@media (max-width: 768px) {
  .product-link {
    grid-template-columns: auto 1fr auto;
    gap: 14px;
    padding: 24px 6px;
  }
  .product-link__bar { display: none; }
  .product-link__num {
    font-size: 11px;
    letter-spacing: 1.5px;
    padding-top: 4px;
    min-width: 22px;
  }
  .product-link__name {
    font-size: 18px;
    letter-spacing: 1px;
  }
  .product-link__family { display: none; }
  .product-link__cta { padding-left: 8px; gap: 0; }
  .product-link__cta-label { display: none; }
  .product-link__cta-arrow { width: 36px; height: 36px; font-size: 18px; }
  .product-link__scenes-list { font-size: 12px; }
}

/* ============================================================
   Technology Section
   ============================================================ */
.tech {
  padding: clamp(60px, 8vw, 100px) 0 clamp(80px, 9vw, 120px);
  background: var(--color-navy);
  color: var(--color-white);
}

.tech .section-title {
  color: var(--color-white);
}

.tech__content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.tech__heading {
  font-size: 26px;
  font-weight: 600;
  margin-bottom: 20px;
  line-height: 1.4;
}

.tech__desc {
  font-size: 15px;
  line-height: 1.9;
  color: var(--color-light-glass);
  margin-bottom: 40px;
}

.tech__highlights {
  display: flex;
  gap: 48px;
}

.tech__highlight {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.tech__highlight-num {
  font-size: 36px;
  font-weight: 700;
  color: var(--color-primary-light);
  letter-spacing: 1px;
}

.tech__highlight-label {
  font-size: 13px;
  color: var(--color-light-glass-soft);
  letter-spacing: 1px;
}

.tech__visual {
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-light-panel);
  border-radius: 8px;
  padding: 30px;
  border: 1px solid var(--color-light-border);
}

.tech__image {
  width: 100%;
  max-width: 480px;
  height: auto;
  filter: brightness(1.1);
}

/* ============================================================
   About Section
   ============================================================ */
.about {
  padding: clamp(60px, 8vw, 100px) 0 clamp(80px, 9vw, 120px);
  background: var(--color-bg-light);
}

.about__intro {
  font-size: 17px;
  line-height: 2;
  color: var(--color-text);
  max-width: 800px;
  margin-bottom: 60px;
}

.about__stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
}

.about__stat {
  text-align: center;
  padding: 40px 20px;
  background: var(--color-white);
  border-radius: 4px;
  border: 1px solid var(--color-border);
  transition: all 0.4s ease;
}

.about__stat:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 30px var(--color-shadow);
}

.about__stat-num {
  font-size: 40px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 8px;
  letter-spacing: 1px;
}

.about__stat-label {
  font-size: 14px;
  color: var(--color-text-light);
  letter-spacing: 1px;
}

/* --- About sub-page entries (homepage) --- */
.about__photo {
  position: relative;
  margin: 0 0 clamp(28px, 3.5vw, 40px);
  border-radius: 4px;
  overflow: hidden;
  aspect-ratio: 21 / 9;
  background: var(--color-dark);
  box-shadow: 0 20px 50px var(--color-shadow);
}

.about__photo-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 1s ease;
}

.about__photo:hover .about__photo-img {
  transform: scale(1.02);
}

.about__photo-caption {
  position: absolute;
  left: clamp(20px, 3vw, 32px);
  bottom: clamp(20px, 3vw, 28px);
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 12px 20px;
  background: var(--color-dark-glass-strong);
  backdrop-filter: blur(10px);
  border-left: 3px solid var(--color-primary-light);
  color: var(--color-white);
}

.about__photo-label {
  font-size: 12.5px;
  letter-spacing: 3px;
  font-weight: 600;
  text-transform: uppercase;
}

.about__photo-addr {
  font-size: 12px;
  color: var(--color-light-glass);
  letter-spacing: 0.5px;
}

@media (max-width: 768px) {
  .about__photo { aspect-ratio: 16 / 9; }
}
@media (max-width: 480px) {
  .about__photo { aspect-ratio: 4 / 3; }
  .about__photo-caption { left: 12px; bottom: 12px; padding: 10px 14px; }
  .about__photo-label { font-size: 11px; letter-spacing: 2px; }
  .about__photo-addr { font-size: 11px; }
}

/* --- About sub-page entry cards (homepage) --- */
.about__entries {
  margin-top: 36px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.about__entry {
  display: grid;
  grid-template-columns: 56px 1fr auto;
  align-items: center;
  gap: 18px;
  padding: 22px 28px;
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: 4px;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}

.about__entry::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--color-primary);
  transform: scaleY(0);
  transform-origin: top;
  transition: transform var(--transition);
}

.about__entry:hover {
  transform: translateY(-3px);
  box-shadow: 0 14px 36px var(--color-shadow);
  border-color: var(--color-primary-pale);
}
.about__entry:hover::before { transform: scaleY(1); }

.about__entry-no {
  font-size: 18px;
  font-weight: 700;
  color: var(--color-primary);
  letter-spacing: 1px;
  font-family: "Inter", monospace;
}

.about__entry-body {
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-width: 0;
}

.about__entry-title {
  font-size: 17px;
  font-weight: 600;
  color: var(--color-text);
  letter-spacing: 1px;
}

.about__entry-desc {
  font-size: 13px;
  color: var(--color-text-light);
  letter-spacing: 0.5px;
}

.about__entry-arrow {
  font-size: 18px;
  color: var(--color-primary);
  transition: transform var(--transition);
}

.about__entry:hover .about__entry-arrow {
  transform: translateX(4px);
}

@media (max-width: 768px) {
  .about__entries { grid-template-columns: 1fr; }
  .about__entry { padding: 18px 20px; gap: 14px; }
}

/* ============================================================
   Footer
   ============================================================ */
.footer {
  background: var(--color-dark);
  color: var(--color-light-glass);
  padding: 80px 0 0;
}

.footer__grid {
  display: grid;
  grid-template-columns: minmax(0, 1.8fr) minmax(0, 1fr) minmax(0, 1fr) minmax(340px, 1.7fr);
  gap: 28px;
  padding-bottom: 60px;
  border-bottom: 1px solid var(--color-light-border);
}

.footer__logo {
  margin-bottom: 12px;
}

.footer__slogan {
  font-size: 13px;
  color: var(--color-light-glass-faint);
  letter-spacing: 1px;
}

.footer__col-title {
  font-size: 15px;
  font-weight: 600;
  color: var(--color-white);
  margin-bottom: 20px;
  letter-spacing: 1px;
}

.footer__link {
  display: block;
  font-size: 14px;
  color: var(--color-light-glass-soft);
  margin-bottom: 12px;
  transition: color var(--transition);
}

.footer__link:hover {
  color: var(--color-white);
}

.footer__info {
  font-size: 14px;
  color: var(--color-light-glass-soft);
  margin-bottom: 10px;
  line-height: 1.6;
}

@media (min-width: 1025px) {
  .footer__grid > .footer__col:last-child .footer__info:first-of-type {
    white-space: nowrap;
  }
  html[data-lang="en"] .footer__grid > .footer__col:last-child .footer__info:first-of-type {
    white-space: normal;
  }
}

.footer__bottom {
  padding: 24px 0;
  text-align: center;
  font-size: 13px;
  color: var(--color-light-border);
}

/* ============================================================
   Animations
   ============================================================ */
.fade-up {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.fade-up.visible {
  opacity: 1;
  transform: translateY(0);
}

.product-link.fade-up:nth-child(2) { transition-delay: 0.08s; }
.product-link.fade-up:nth-child(3) { transition-delay: 0.16s; }
.product-link.fade-up:nth-child(4) { transition-delay: 0.24s; }

/* ============================================================
   Responsive
   ============================================================ */
@media (max-width: 1024px) {
  .nav__inner {
    grid-template-columns: auto 1fr auto;
    gap: 16px;
    padding: 0 28px;
  }
  .nav__links {
    padding-left: clamp(24px, 4vw, 60px);
  }

  .products__grid { grid-template-columns: 1fr; gap: 0; }

  .tech__content { grid-template-columns: 1fr; gap: 40px; }
  .tech__visual { order: -1; }

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

  .footer__grid { grid-template-columns: 1fr 1fr; gap: 40px; }

  .nav__logo-lockup { gap: 8px; }
  .brand-logo--nav-en { height: 14px; }
  .brand-logo--nav-cn { height: 18px; }
  .brand-logo--footer { height: 52px; }
}

@media (max-width: 900px) {
  :root { --nav-height: 60px; }

  .nav__inner {
    display: flex;
    justify-content: space-between;
    padding: 0 20px;
  }

  .nav__links {
    display: none;
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    height: calc(100vh - var(--nav-height));
    height: calc(100dvh - var(--nav-height));
    background: var(--color-dark-glass-strong);
    backdrop-filter: blur(14px);
    flex-direction: column;
    align-items: center;
    gap: 16px;
    margin: 0;
    overflow-y: auto;
    padding: 32px 0 24px;
    z-index: 200;
  }

  .nav__links--open {
    display: flex;
  }

  .nav__link {
    font-size: 17px;
  }

  .nav__hamburger {
    display: flex;
  }

  .nav__logo-lockup { gap: 7px; }
  .brand-logo--nav-en { height: 13px; }
  .brand-logo--nav-cn { height: 16px; }

  .nav__lang {
    font-size: 11px;
    padding: 3px 8px;
  }
}

@media (max-width: 768px) {
  .hero {
    min-height: 480px;  /* allow svh to win on small phones with browser chrome */
  }

  .hero__video {
    width: 95%;
  }

  .hero__overlay {
    bottom: 100px;
  }

  .hero__scroll-hint {
    bottom: 28px;
  }

  .hero__title {
    font-size: clamp(22px, 7.8vw, 32px);
    white-space: nowrap;
    letter-spacing: 2px;
  }
  html[data-lang="en"] .hero__title {
    font-size: clamp(15px, 4.6vw, 22px);
    white-space: normal;
    letter-spacing: 0.5px;
    line-height: 1.5;
  }
  html[data-lang="en"] .hero__title .hero__br-mobile {
    display: block;
  }
  html[data-lang="en"] .hero__subtitle {
    font-size: clamp(10px, 3vw, 14px);
    letter-spacing: 0.5px;
    white-space: nowrap;
  }

  .hero__cta {
    padding: 12px 32px;
    font-size: 14px;
  }

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

  .tech__highlights { gap: 24px; }
  .tech__highlight-num { font-size: 28px; }

  .about__stats { grid-template-columns: repeat(2, 1fr); gap: 16px; }
  .about__stat { padding: 24px 12px; }
  .about__stat-num { font-size: 28px; }

  .section-title { font-size: 24px; }
  .section-header { margin-bottom: 32px; }

  .footer__grid { grid-template-columns: 1fr; gap: 32px; }
  .footer { padding: 48px 0 0; }
  .brand-logo--footer { height: 48px; }
}

@media (max-width: 480px) {
  .hero__overlay { bottom: 90px; }
  .hero__scroll-hint { bottom: 20px; }
  .credentials__grid { grid-template-columns: 1fr; }
  .tech__highlights { flex-direction: column; gap: 16px; }
  .about__stats { grid-template-columns: 1fr 1fr; }
  .nav__logo-lockup { gap: 6px; }
  .brand-logo--nav-en { height: 11px; }
  .brand-logo--nav-cn { height: 14px; }
  .brand-logo--footer { height: 42px; }
}

/* --- Homepage tech summary additions ------------------------ */
.section-header--light .section-more {
  color: var(--color-light-glass);
}
.section-header--light .section-more:hover {
  color: var(--color-primary-light);
}
.section-eyebrow {
  font-size: 11px;
  letter-spacing: 3px;
  color: var(--color-light-glass-faint);
  font-weight: 500;
  font-family: "Inter", sans-serif;
}

.tech__text .tech__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 11px;
  letter-spacing: 3px;
  color: var(--color-primary-light);
  font-weight: 600;
  margin-bottom: 18px;
  text-transform: uppercase;
}
.tech__text .tech__eyebrow::before {
  content: "";
  width: 28px;
  height: 2px;
  background: var(--color-primary-light);
  display: inline-block;
}
.tech__heading-accent {
  color: var(--color-primary-light);
  font-weight: 700;
}
.tech__highlight-num sup {
  font-size: 0.4em;
  color: var(--color-primary-light);
  font-weight: 600;
  margin-left: 2px;
  vertical-align: super;
  letter-spacing: 1px;
}
.tech__cta {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-top: 32px;
  padding: 12px 24px;
  background: transparent;
  color: var(--color-white);
  border: 1px solid var(--color-light-border);
  font-size: 13.5px;
  letter-spacing: 2px;
  font-weight: 500;
  transition: all var(--transition);
}
.tech__cta:hover {
  background: var(--color-primary);
  border-color: var(--color-primary);
}
.tech__cta span {
  transition: transform var(--transition);
}
.tech__cta:hover span {
  transform: translateX(4px);
}

/* ============================================================
   Nav dropdown (产品中心 / 关于我们)
   ============================================================ */
.nav__item {
  position: relative;
  display: flex;
  align-items: center;
}

.nav__link--has-sub {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  cursor: pointer;
}

.nav__caret {
  transition: transform var(--transition);
  opacity: 0.72;
}

.nav__item--has-sub:hover .nav__caret,
.nav__item--open .nav__caret {
  transform: rotate(180deg);
  opacity: 1;
}

.nav__sub {
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translate(-50%, 8px);
  min-width: 0;
  width: max-content;
  max-width: min(calc(100vw - 2rem), 52rem);
  padding: 10px;
  margin-top: 8px;
  background: var(--color-dark-glass-strong);
  backdrop-filter: blur(14px);
  border: 1px solid var(--color-light-border);
  border-radius: 4px;
  box-shadow: 0 18px 40px var(--color-shadow-strong);
  display: flex;
  flex-direction: row;
  flex-wrap: wrap;
  align-items: stretch;
  gap: 8px;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity var(--transition), transform var(--transition), visibility var(--transition);
  z-index: 100;
}

/* Invisible bridge so the menu stays open while moving the cursor down. */
.nav__sub::before {
  content: "";
  position: absolute;
  top: -12px;
  left: 0;
  right: 0;
  height: 12px;
}

.nav__item--has-sub:hover .nav__sub,
.nav__item--has-sub:focus-within .nav__sub,
.nav__item--open .nav__sub {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transform: translate(-50%, 0);
  transition: opacity var(--transition), transform var(--transition);
}

.nav__sub-link {
  display: flex;
  flex-direction: column;
  flex: 0 1 calc(25% - 6px);
  gap: 2px;
  padding: 12px 18px;
  min-width: 0;
  max-width: none;
  border-radius: 2px;
  border-right: 1px solid var(--color-light-glass-faint);
  color: var(--color-light-glass);
  transition: background var(--transition), color var(--transition);
}
.nav__sub-link:nth-child(4n),
.nav__sub-link:last-child {
  border-right: 0;
}

.nav__sub-link:hover {
  background: var(--color-light-panel);
  color: var(--color-white);
}

.nav__sub-name {
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 1px;
}

.nav__sub-desc {
  font-size: 10.5px;
  letter-spacing: 0.5px;
  color: var(--color-light-glass-faint);
}

/* --- Product dropdown: three-level flyout --- */
.nav__sub--products > .nav__sub-link {
  flex: 1 1 0;
}
.nav__sub-link--parent {
  position: relative;
  cursor: default;
}
.nav__sub-link--parent .nav__sub-name::after {
  content: '';
  display: inline-block;
  width: 0;
  height: 0;
  border-left: 3.5px solid transparent;
  border-right: 3.5px solid transparent;
  border-top: 4px solid currentColor;
  margin-left: 6px;
  vertical-align: middle;
}
.nav__sub-children {
  position: absolute;
  top: 100%;
  left: -1px;
  right: -1px;
  display: flex;
  flex-direction: column;
  background: var(--color-dark-glass-strong);
  backdrop-filter: blur(14px);
  border: 1px solid var(--color-light-border);
  border-top: none;
  border-radius: 0 0 4px 4px;
  padding: 4px 0;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity var(--transition), visibility var(--transition);
  z-index: 10;
}
.nav__sub-link--parent:hover .nav__sub-children,
.nav__sub-link--parent:focus-within .nav__sub-children,
.nav__sub-link--parent.nav__sub-link--expanded .nav__sub-children {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
}
.nav__sub-child {
  display: block;
  padding: 8px 18px;
  color: var(--color-light-glass);
  font-size: 13px;
  letter-spacing: 0.5px;
  white-space: nowrap;
  transition: background var(--transition), color var(--transition);
}
.nav__sub-child:hover {
  background: var(--color-light-panel);
  color: var(--color-white);
}

@media (max-width: 900px) {
  /* Level-1 containers: group parent + its children */
  .nav__item--has-sub {
    width: min(100%, 320px);
    flex-direction: column;
    align-items: center;
    background: rgba(255, 255, 255, 0.03);
    border-radius: 3px;
    padding: 6px;
    margin: 2px 0;
  }
  .nav__link--has-sub { pointer-events: none; }
  .nav__caret { display: none; }
  .nav__sub {
    position: static;
    transform: none;
    min-width: 0;
    width: 100%;
    margin-top: 4px;
    padding: 0;
    background: none;
    border: none;
    box-shadow: none;
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    display: flex;
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
  }
  .nav__sub::before { display: none; }
  .nav__item--has-sub:hover .nav__sub,
  .nav__item--has-sub:focus-within .nav__sub,
  .nav__item--open .nav__sub { transform: none; }
  /* Level-2 containers */
  .nav__sub-link {
    flex: 0 0 auto;
    text-align: center;
    align-items: center;
    min-width: 0;
    max-width: none;
    padding: 10px 14px;
    border-right: 0;
    background: rgba(255, 255, 255, 0.04);
    border-radius: 2px;
  }
  .nav__sub-link + .nav__sub-link {
    border-left: 0;
    border-top: none;
  }
  .nav__sub--products > .nav__sub-link {
    flex: 0 0 auto;
  }
  .nav__sub-link--parent {
    background: rgba(255, 255, 255, 0.04);
    border-radius: 2px;
    padding-bottom: 6px;
  }
  .nav__sub-link--parent .nav__sub-name::after {
    display: none;
  }
  /* Level-3 container: child links area */
  .nav__sub-children {
    position: static;
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    background: rgba(255, 255, 255, 0.04);
    backdrop-filter: none;
    border: none;
    border-radius: 2px;
    padding: 4px;
    margin-top: 6px;
  }
  .nav__sub-child {
    text-align: center;
    padding: 7px 14px;
    font-size: 11.5px;
    color: var(--color-light-glass);
  }
  .nav__sub-child::after {
    content: ' ›';
    opacity: 0.5;
  }
  .nav__sub-name { font-size: 13px; }
  .nav__sub-desc { font-size: 9.5px; }
}

/* Footer "view details" CTA link */
.footer__link--cta {
  margin-top: 14px;
  padding-top: 12px;
  border-top: 1px solid var(--color-light-border);
  color: var(--color-primary-light);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-weight: 500;
  letter-spacing: 0.5px;
}

.footer__link--cta:hover {
  color: var(--color-white);
}

.footer__link--cta span {
  transition: transform var(--transition);
  display: inline-block;
}

.footer__link--cta:hover span {
  transform: translateX(4px);
}

/* ============================================================
   Floating Contact Widget (global — injected by components.js)
   ============================================================ */
.cwidget {
  position: fixed;
  right: clamp(18px, 2.4vw, 28px);
  bottom: clamp(18px, 2.4vw, 28px);
  z-index: 1100;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 14px;
  font-family: inherit;
  pointer-events: none;
}

.cwidget--hidden {
  display: none;
}

/* --- Floating action button --- */
.cwidget__fab {
  position: relative;
  width: 60px;
  height: 60px;
  border-radius: 50%;
  background: var(--color-primary);
  color: var(--color-white);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 10px 30px var(--color-glow), 0 4px 12px var(--color-shadow-strong);
  transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
  align-self: flex-end;
  pointer-events: auto;
}

.cwidget__fab:hover {
  background: var(--color-primary-light);
  transform: translateY(-2px);
}

.cwidget__fab-icon,
.cwidget__fab-close {
  position: absolute;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: opacity var(--transition), transform var(--transition);
}

.cwidget__fab-icon { width: 28px; height: 28px; }
.cwidget__fab-close { width: 22px; height: 22px; opacity: 0; transform: rotate(-90deg); }

.cwidget[data-state="open"] .cwidget__fab-icon { opacity: 0; transform: rotate(90deg); }
.cwidget[data-state="open"] .cwidget__fab-close { opacity: 1; transform: rotate(0); }

/* attention pulse — only before first interaction */
.cwidget__fab::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: 50%;
  border: 2px solid var(--color-primary);
  opacity: 0;
  pointer-events: none;
}

.cwidget[data-attention="true"] .cwidget__fab::after {
  animation: cwidgetPulse 2.4s ease-out infinite;
}

@keyframes cwidgetPulse {
  0%   { transform: scale(1);   opacity: 0.55; }
  70%  { transform: scale(1.7); opacity: 0; }
  100% { transform: scale(1.7); opacity: 0; }
}

/* --- Panel --- */
.cwidget__panel {
  width: min(330px, calc(100vw - 36px));
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  box-shadow: 0 24px 60px var(--color-shadow-strong);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  max-height: calc(100vh - 188px);
  max-height: calc(100dvh - 188px);
  transform-origin: bottom right;
  opacity: 0;
  visibility: hidden;
  transform: translateY(16px) scale(0.96);
  pointer-events: none;
  transition: opacity var(--transition), transform var(--transition), visibility var(--transition);
}

.cwidget[data-state="open"] .cwidget__panel {
  opacity: 1;
  visibility: visible;
  transform: translateY(0) scale(1);
  pointer-events: auto;
}

.cwidget__head {
  position: relative;
  flex-shrink: 0;
  padding: 22px 22px 20px;
  background: var(--color-dark);
  color: var(--color-white);
}

.cwidget__eyebrow {
  display: block;
  font-size: 10.5px;
  font-weight: 600;
  letter-spacing: 3px;
  text-transform: uppercase;
  color: var(--color-primary-soft);
  margin-bottom: 8px;
}

.cwidget__title {
  font-size: 17px;
  font-weight: 600;
  letter-spacing: 0.5px;
  line-height: 1.4;
}

.cwidget__close {
  position: absolute;
  top: 16px;
  right: 16px;
  width: 30px;
  height: 30px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-light-glass);
  border: 1px solid var(--color-light-border);
  border-radius: 4px;
  transition: color var(--transition), border-color var(--transition);
}

.cwidget__close:hover {
  color: var(--color-white);
  border-color: var(--color-light-glass-soft);
}

.cwidget__body {
  padding: 8px 22px 4px;
  overflow-y: auto;
}

.cwidget__channel {
  padding: 16px 0;
  border-bottom: 1px solid var(--color-border);
}

.cwidget__tag {
  display: block;
  font-family: "Inter", "SFMono-Regular", Consolas, monospace;
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 2px;
  color: var(--color-primary);
  margin-bottom: 6px;
}

.cwidget__cname {
  display: block;
  font-size: 14px;
  font-weight: 600;
  color: var(--color-text);
  letter-spacing: 0.5px;
  margin-bottom: 10px;
}

.cwidget__line {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 6px 0;
  font-size: 15px;
  font-weight: 500;
  color: var(--color-dark);
  letter-spacing: 0.6px;
  transition: color var(--transition);
}

.cwidget__line:hover { color: var(--color-primary); }

.cwidget__line svg {
  flex-shrink: 0;
  width: 15px;
  height: 15px;
  color: var(--color-text-light);
  transition: color var(--transition);
}

.cwidget__line:hover svg { color: var(--color-primary); }

.cwidget__person {
  flex-shrink: 0;
  min-width: 30px;
  font-size: 12px;
  font-weight: 500;
  color: var(--color-text-light);
}

.cwidget__addr {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 16px 0 18px;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--color-text-light);
  letter-spacing: 0.4px;
}

.cwidget__addr svg {
  flex-shrink: 0;
  width: 15px;
  height: 15px;
  margin-top: 2px;
  color: var(--color-primary);
}

.cwidget__detail {
  display: flex;
  flex-shrink: 0;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 15px 22px;
  background: var(--color-primary);
  color: var(--color-white);
  font-size: 13.5px;
  font-weight: 500;
  letter-spacing: 1px;
  transition: background var(--transition);
}

.cwidget__detail:hover { background: var(--color-primary-light); }

.cwidget__detail span {
  transition: transform var(--transition);
}

.cwidget__detail:hover span { transform: translateX(4px); }

@media (prefers-reduced-motion: reduce) {
  .cwidget[data-attention="true"] .cwidget__fab::after { animation: none; }
  .cwidget__panel,
  .cwidget__fab,
  .cwidget__fab-icon,
  .cwidget__fab-close { transition: none; }
}

@media (max-width: 480px) {
  .cwidget__fab { width: 54px; height: 54px; }
  .cwidget__fab-icon { width: 25px; height: 25px; }
}