/* ============================================
   Yunhan Design System
   Shared CSS for all pages
   Last updated: 2026-09-10 (v2 · Editorial Swiss)
   ============================================ */

/* ============================================
   Design Tokens
   ============================================ */
:root {
  /* Color — 4-color restrained palette */
  --color-ink: #0A1929;          /* 墨蓝 · deep ink */
  --color-paper: #FAF7F2;        /* 暖白 · warm paper */
  --color-primary: #2D5BFF;      /* 蓝 · Yunhan blue */
  --color-amber: #B8956A;        /* 琥珀金 · accent */

  /* Semantic */
  --color-deep: var(--color-ink);
  --color-bg: #FFFFFF;
  --color-bg-soft: var(--color-paper);
  --color-text: #1A1A1A;
  --color-text-2: #5A5A5A;
  --color-text-3: #999999;
  --color-border: #E8E4DC;
  --color-border-warm: #D9D2C5;
  --color-border-dark: rgba(250, 247, 242, 0.12);

  /* Typography */
  --font-display: 'Fraunces', 'Noto Serif SC', 'Songti SC', 'SimSun', Georgia, serif;
  --font-sans: 'Inter', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'SF Mono', 'Consolas', monospace;

  /* Spacing */
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 24px;
  --space-6: 32px;
  --space-7: 48px;
  --space-8: 64px;
  --space-9: 96px;
  --space-10: 128px;
  --space-11: 160px;
  --space-12: 200px;

  /* Layout */
  --container: 1240px;
  --container-narrow: 920px;
  --radius: 4px;        /* 瑞士极简 · 不用大圆角 */
  --radius-sm: 2px;
  --radius-lg: 8px;
  --radius-pill: 999px;

  /* Shadow — 更克制 */
  --shadow-sm: 0 1px 2px rgba(10, 25, 41, 0.04);
  --shadow-md: 0 4px 16px rgba(10, 25, 41, 0.06);
  --shadow-lg: 0 16px 48px rgba(10, 25, 41, 0.08);

  /* Transition */
  --t-fast: 200ms cubic-bezier(0.4, 0, 0.2, 1);
  --t-base: 400ms cubic-bezier(0.4, 0, 0.2, 1);
  --t-slow: 700ms cubic-bezier(0.4, 0, 0.2, 1);
  --t-spring: 800ms cubic-bezier(0.16, 1, 0.3, 1);
}

/* ============================================
   Base Reset
   ============================================ */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-bg);
  overflow-x: hidden;
  /* Subtle paper grain texture */
  background-image:
    radial-gradient(circle at 50% 50%, transparent 0%, transparent 100%),
    url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='200' height='200'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2'/><feColorMatrix values='0 0 0 0 0  0 0 0 0 0  0 0 0 0 0  0 0 0 0.04 0'/></filter><rect width='100%' height='100%' filter='url(%23n)'/></svg>");
  background-attachment: fixed;
  background-size: 200px 200px;
}

img, svg {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: inherit;
  text-decoration: none;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

ul, ol {
  list-style: none;
}

h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  line-height: 1.3;
}

/* ============================================
   Layout Helpers
   ============================================ */
.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--space-5);
}

.container-narrow {
  max-width: var(--container-narrow);
  margin: 0 auto;
  padding: 0 var(--space-5);
}

.section {
  padding: var(--space-10) 0;
}

.section--soft {
  background: var(--color-bg-soft);
}

.section--dark {
  background: var(--color-deep);
  color: #fff;
}

.section-header {
  text-align: center;
  margin-bottom: var(--space-9);
}

.section-eyebrow {
  display: inline-block;
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: var(--space-3);
}

.section--dark .section-eyebrow {
  color: var(--color-primary-light);
}

.section-title {
  font-family: var(--font-display);
  font-size: clamp(32px, 4vw, 48px);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.02em;
  color: var(--color-text);
}

.section--dark .section-title {
  color: #fff;
}

.section-subtitle {
  font-size: 18px;
  color: var(--color-text-2);
  margin-top: var(--space-4);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.section--dark .section-subtitle {
  color: rgba(255, 255, 255, 0.7);
}

/* ============================================
   Navigation
   ============================================ */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.8);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid var(--color-border);
  transition: background var(--t-base);
}

.nav--scrolled {
  background: rgba(255, 255, 255, 0.95);
}

.nav--dark {
  background: rgba(10, 31, 61, 0.7);
  border-bottom-color: var(--color-border-dark);
}

.nav--dark.nav--scrolled {
  background: rgba(10, 31, 61, 0.95);
}

.nav--dark .nav__link,
.nav--dark .nav__brand-text,
.nav--dark .nav__brand-tag,
.nav--dark .nav__burger span {
  color: #fff;
}

.nav--dark .nav__cta {
  background: #fff;
  color: var(--color-text);
}

.nav--dark .nav__cta:hover {
  background: var(--color-primary);
  color: #fff;
}

.nav__inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--space-5);
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav__brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.nav__logo {
  width: 36px;
  height: 36px;
}

.nav__brand-text {
  font-weight: 700;
  font-size: 17px;
  letter-spacing: -0.01em;
}

.nav__brand-tag {
  font-size: 12px;
  color: var(--color-text-2);
  margin-left: var(--space-1);
}

.nav__menu {
  display: flex;
  align-items: center;
  gap: var(--space-7);
}

.nav__link {
  font-size: 14px;
  font-weight: 500;
  color: var(--color-text);
  position: relative;
  padding: var(--space-2) 0;
}

.nav__link::after {
  content: '';
  position: absolute;
  left: 0;
  right: 0;
  bottom: -2px;
  height: 2px;
  background: var(--color-primary);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--t-base);
}

.nav__link:hover::after,
.nav__link.is-active::after {
  transform: scaleX(1);
}

.nav__link.is-active {
  color: var(--color-primary);
}

.nav__cta {
  padding: 8px 18px;
  background: var(--color-text);
  color: var(--color-bg);
  border-radius: 999px;
  font-size: 13px;
  font-weight: 500;
  transition: background var(--t-base);
}

.nav__cta:hover {
  background: var(--color-primary);
  color: #fff;
}

.nav__burger {
  display: none;
  width: 32px;
  height: 32px;
  flex-direction: column;
  justify-content: center;
  gap: 4px;
}

.nav__burger span {
  display: block;
  width: 18px;
  height: 2px;
  background: var(--color-text);
  margin: 0 auto;
}

/* ============================================
   Buttons
   ============================================ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: 14px 28px;
  border-radius: 999px;
  font-size: 15px;
  font-weight: 500;
  letter-spacing: -0.005em;
  transition: all var(--t-base);
  white-space: nowrap;
  cursor: pointer;
  border: 1px solid transparent;
}

.btn--primary {
  background: var(--color-primary);
  color: #fff;
}

.btn--primary:hover {
  background: var(--color-primary-dark);
  transform: translateY(-1px);
}

.btn--ghost {
  background: transparent;
  color: #fff;
  border-color: rgba(255, 255, 255, 0.2);
}

.btn--ghost:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.4);
}

.btn--dark {
  background: var(--color-text);
  color: #fff;
}

.btn--dark:hover {
  background: var(--color-deep);
  transform: translateY(-1px);
}

.btn--outline {
  background: transparent;
  color: var(--color-text);
  border-color: var(--color-border);
}

.btn--outline:hover {
  border-color: var(--color-text);
}

.btn--sm {
  padding: 8px 16px;
  font-size: 13px;
}

.btn__arrow {
  transition: transform var(--t-base);
}

.btn:hover .btn__arrow {
  transform: translateX(4px);
}

/* ============================================
   Page Hero (sub pages)
   ============================================ */
.page-hero {
  padding: var(--space-8) 0 var(--space-10);
  background: var(--color-bg-soft);
  text-align: center;
}

.page-hero--dark {
  background: var(--color-deep);
  color: #fff;
  position: relative;
  overflow: hidden;
}

.page-hero--dark::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 600px 400px at 20% 30%, rgba(45, 91, 255, 0.15), transparent 60%),
    radial-gradient(ellipse 500px 600px at 80% 70%, rgba(45, 91, 255, 0.08), transparent 60%);
  pointer-events: none;
}

.page-hero--dark .page-hero__title,
.page-hero--dark .page-hero__title-en {
  color: #fff;
  position: relative;
}

.page-hero--dark .page-hero__desc {
  color: rgba(255, 255, 255, 0.7);
  position: relative;
}

.page-hero__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: 6px 12px;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 999px;
  font-size: 12px;
  letter-spacing: 0.05em;
  color: var(--color-text-2);
  margin-bottom: var(--space-5);
}

.page-hero--dark .page-hero__eyebrow {
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.12);
  color: rgba(255, 255, 255, 0.7);
  position: relative;
}

.page-hero__title {
  font-family: var(--font-display);
  font-size: clamp(36px, 5vw, 56px);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.025em;
  color: var(--color-text);
  margin-bottom: var(--space-3);
}

.page-hero__title-en {
  font-size: 18px;
  font-weight: 400;
  color: var(--color-text-3);
  letter-spacing: -0.005em;
  margin-bottom: var(--space-5);
}

.page-hero__desc {
  font-size: 17px;
  line-height: 1.6;
  color: var(--color-text-2);
  max-width: 640px;
  margin: 0 auto;
}

/* ============================================
   Hero (home page)
   ============================================ */
.hero {
  position: relative;
  min-height: 100vh;
  background: var(--color-deep);
  color: #fff;
  overflow: hidden;
  display: flex;
  align-items: center;
  padding-top: 64px;
}

.hero__bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 800px 600px at 20% 30%, rgba(45, 91, 255, 0.15), transparent 60%),
    radial-gradient(ellipse 600px 800px at 80% 70%, rgba(45, 91, 255, 0.08), transparent 60%);
  pointer-events: none;
}

.hero__grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.03) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse 80% 60% at 50% 50%, black, transparent);
  -webkit-mask-image: radial-gradient(ellipse 80% 60% at 50% 50%, black, transparent);
  pointer-events: none;
}

.hero__container {
  position: relative;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--space-5);
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: var(--space-9);
  align-items: center;
  width: 100%;
}

.hero__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: 6px 12px;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 999px;
  font-size: 12px;
  letter-spacing: 0.05em;
  color: rgba(255, 255, 255, 0.7);
  margin-bottom: var(--space-6);
}

.hero__eyebrow-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-primary);
  box-shadow: 0 0 8px var(--color-primary);
}

.hero__title {
  font-family: var(--font-display);
  font-size: clamp(40px, 5.5vw, 72px);
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: -0.03em;
  color: #fff;
  margin-bottom: var(--space-5);
}

.hero__title-en {
  font-family: var(--font-display);
  font-size: clamp(18px, 1.6vw, 22px);
  font-weight: 400;
  line-height: 1.4;
  letter-spacing: -0.005em;
  color: rgba(255, 255, 255, 0.5);
  margin-bottom: var(--space-7);
}

.hero__subtitle {
  font-size: 17px;
  line-height: 1.6;
  color: rgba(255, 255, 255, 0.7);
  max-width: 480px;
  margin-bottom: var(--space-7);
}

.hero__cta {
  display: flex;
  gap: var(--space-4);
  flex-wrap: wrap;
}

/* Hero Visual */
.hero__visual {
  position: relative;
  aspect-ratio: 1 / 1.1;
  display: flex;
  align-items: center;
  justify-content: center;
}

.hero__visual-glow {
  position: absolute;
  width: 70%;
  height: 70%;
  background: radial-gradient(circle, rgba(45, 91, 255, 0.4), transparent 70%);
  filter: blur(60px);
}

.hero__phone {
  position: relative;
  width: 280px;
  aspect-ratio: 9 / 19;
  background: linear-gradient(135deg, #2D5BFF 0%, #00C896 50%, #00D4FF 100%);
  border-radius: 36px;
  padding: 8px;
  box-shadow:
    0 30px 80px rgba(45, 91, 255, 0.3),
    inset 0 1px 0 rgba(255, 255, 255, 0.2);
}

.hero__phone-screen {
  width: 100%;
  height: 100%;
  background: rgba(255, 255, 255, 0.05);
  border-radius: 28px;
  backdrop-filter: blur(20px);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-4);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.hero__phone-logo {
  width: 60%;
  max-width: 140px;
  filter: drop-shadow(0 8px 20px rgba(0, 0, 0, 0.3));
  animation: float 6s ease-in-out infinite;
}

.hero__phone-name {
  font-size: 28px;
  font-weight: 700;
  color: #fff;
  letter-spacing: 0.05em;
}

.hero__phone-tag {
  font-size: 13px;
  color: rgba(255, 255, 255, 0.85);
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-12px); }
}

.hero__scroll {
  position: absolute;
  bottom: var(--space-7);
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
  color: rgba(255, 255, 255, 0.4);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.hero__scroll-line {
  width: 1px;
  height: 40px;
  background: linear-gradient(to bottom, rgba(255, 255, 255, 0.4), transparent);
  animation: scrollDown 2s ease-in-out infinite;
}

@keyframes scrollDown {
  0% { transform: translateY(0); opacity: 0.4; }
  50% { opacity: 1; }
  100% { transform: translateY(20px); opacity: 0; }
}

/* ============================================
   Product Card (used in home + products page)
   ============================================ */
.products__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-5);
}

.product-card {
  position: relative;
  padding: var(--space-6);
  background: var(--color-bg-soft);
  border-radius: var(--radius-lg);
  transition: all var(--t-base);
  cursor: pointer;
  overflow: hidden;
  min-height: 320px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  color: inherit;
}

.product-card:hover {
  transform: translateY(-4px);
  background: var(--color-bg);
  box-shadow: var(--shadow-lg);
}

.product-card__visual {
  width: 100%;
  aspect-ratio: 16 / 9;
  border-radius: var(--radius);
  overflow: hidden;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
}

.product-card__visual img {
  max-width: 60%;
  max-height: 80%;
  object-fit: contain;
}

.product-card--inkshare .product-card__visual {
  background: linear-gradient(135deg, #FFE5D9 0%, #FFC1A0 100%);
}

.product-card--kaoshi .product-card__visual {
  background: linear-gradient(135deg, #D4E5FF 0%, #A0C1FF 100%);
}

.product-card--ganhai .product-card__visual {
  background: linear-gradient(135deg, #D4F0E0 0%, #A0E0C0 100%);
}

.product-card--hardware .product-card__visual {
  background: var(--color-bg);
  border: 1.5px dashed var(--color-border);
}

.product-card--chemlab .product-card__visual {
  background: linear-gradient(135deg, #E5D4FF 0%, #C1A0FF 100%);
}

.product-card--wensu .product-card__visual {
  background: linear-gradient(135deg, #FFE5E5 0%, #FFA0A0 100%);
}

.product-card--songdiandian .product-card__visual {
  background: linear-gradient(135deg, #FFF4D4 0%, #FFE0A0 100%);
}

.product-card__info {
  margin-top: var(--space-5);
}

.product-card__name {
  font-size: 22px;
  font-weight: 600;
  letter-spacing: -0.01em;
  margin-bottom: var(--space-2);
  display: flex;
  align-items: baseline;
  gap: var(--space-2);
  flex-wrap: wrap;
}

.product-card__name-en {
  font-size: 13px;
  color: var(--color-text-3);
  font-weight: 500;
}

.product-card__desc {
  font-size: 15px;
  color: var(--color-text-2);
  line-height: 1.5;
  margin-bottom: var(--space-4);
}

.product-card__cta {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: 14px;
  font-weight: 500;
  color: var(--color-primary);
}

.product-card__cta-arrow {
  transition: transform var(--t-base);
}

.product-card:hover .product-card__cta-arrow {
  transform: translateX(4px);
}

.product-card--hardware .product-card__name,
.product-card--hardware .product-card__desc {
  color: var(--color-text-3);
}

.product-card__badge {
  position: absolute;
  top: var(--space-5);
  right: var(--space-5);
  padding: 4px 10px;
  background: rgba(0, 0, 0, 0.06);
  border-radius: 999px;
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--color-text-2);
  z-index: 2;
}

.product-card__status {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: 4px 10px;
  background: rgba(45, 91, 255, 0.08);
  border-radius: 999px;
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.05em;
  color: var(--color-primary);
  margin-bottom: var(--space-3);
}

.product-card__status-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-primary);
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

.products__footer {
  text-align: center;
  margin-top: var(--space-7);
  font-size: 14px;
  color: var(--color-text-2);
}

.products__footer a {
  color: var(--color-primary);
  font-weight: 500;
}

/* ============================================
   Why Us Cards
   ============================================ */
.why-us__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-5);
}

.why-card {
  padding: var(--space-6);
  background: var(--color-bg);
  border-radius: var(--radius);
  border: 1px solid var(--color-border);
  transition: all var(--t-base);
}

.why-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  border-color: var(--color-primary-light);
}

.why-card__icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: linear-gradient(135deg, rgba(45, 91, 255, 0.1), rgba(45, 91, 255, 0.04));
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-5);
  color: var(--color-primary);
}

.why-card__title {
  font-size: 18px;
  font-weight: 600;
  letter-spacing: -0.01em;
  margin-bottom: var(--space-3);
}

.why-card__desc {
  font-size: 14px;
  color: var(--color-text-2);
  line-height: 1.6;
}

/* ============================================
   Use Cases
   ============================================ */
.use-cases__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-5);
}

.use-case {
  position: relative;
  aspect-ratio: 4 / 3;
  border-radius: var(--radius-lg);
  overflow: hidden;
  cursor: pointer;
  transition: transform var(--t-base);
  display: block;
}

.use-case:hover {
  transform: translateY(-4px);
}

.use-case--campus {
  background: linear-gradient(135deg, #0A1F3D 0%, #2D5BFF 100%);
}

.use-case--family {
  background: linear-gradient(135deg, #00C896 0%, #00D4FF 100%);
}

.use-case__overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(0, 0, 0, 0.5), transparent 60%);
}

.use-case__content {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: var(--space-6);
  color: #fff;
}

.use-case__label {
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  opacity: 0.8;
  margin-bottom: var(--space-3);
}

.use-case__title {
  font-size: 28px;
  font-weight: 600;
  letter-spacing: -0.01em;
  margin-bottom: var(--space-3);
}

.use-case__desc {
  font-size: 15px;
  opacity: 0.85;
  line-height: 1.5;
  max-width: 380px;
}

.use-case__products {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-top: var(--space-4);
}

.use-case__product {
  padding: 4px 10px;
  background: rgba(255, 255, 255, 0.15);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 999px;
  font-size: 12px;
}

/* ============================================
   CTA Section
   ============================================ */
.cta {
  padding: var(--space-10) 0;
  background: var(--color-bg);
  text-align: center;
}

.cta--dark {
  background: var(--color-deep);
  color: #fff;
}

.cta--dark .cta__title {
  color: #fff;
}

.cta--dark .cta__title-en {
  color: rgba(255, 255, 255, 0.5);
}

.cta__title {
  font-family: var(--font-display);
  font-size: clamp(32px, 4vw, 48px);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.15;
  margin-bottom: var(--space-5);
}

.cta__title-en {
  font-size: 16px;
  color: var(--color-text-2);
  margin-bottom: var(--space-7);
}

.cta__buttons {
  display: inline-flex;
  gap: var(--space-4);
  flex-wrap: wrap;
  justify-content: center;
}

/* ============================================
   Footer
   ============================================ */
.footer {
  background: var(--color-bg-soft);
  padding: var(--space-8) 0 var(--space-5);
  border-top: 1px solid var(--color-border);
}

.footer__grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: var(--space-7);
  margin-bottom: var(--space-7);
}

.footer__brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-4);
}

.footer__brand-logo {
  width: 32px;
  height: 32px;
}

.footer__brand-name {
  font-size: 18px;
  font-weight: 700;
}

.footer__brand-tag {
  font-size: 12px;
  color: var(--color-text-2);
}

.footer__tagline {
  font-size: 14px;
  color: var(--color-text-2);
  line-height: 1.6;
  max-width: 280px;
  margin-bottom: var(--space-5);
}

.footer__socials {
  display: flex;
  gap: var(--space-3);
}

.footer__social {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-2);
  transition: all var(--t-base);
}

.footer__social:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  transform: translateY(-2px);
}

.footer__col-title {
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--color-text-3);
  margin-bottom: var(--space-4);
}

.footer__list li {
  margin-bottom: var(--space-3);
}

.footer__list a {
  font-size: 14px;
  color: var(--color-text-2);
  transition: color var(--t-base);
}

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

.footer__bottom {
  padding-top: var(--space-5);
  border-top: 1px solid var(--color-border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-3);
  font-size: 12px;
  color: var(--color-text-3);
}

/* ============================================
   Lab Page Specific
   ============================================ */
.lab-intro {
  background: var(--color-deep);
  color: #fff;
  padding: var(--space-9) 0;
  position: relative;
  overflow: hidden;
}

.lab-intro::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 600px 400px at 30% 40%, rgba(45, 91, 255, 0.2), transparent 60%),
    radial-gradient(ellipse 500px 600px at 80% 80%, rgba(0, 200, 150, 0.1), transparent 60%);
  pointer-events: none;
}

.lab-intro__container {
  position: relative;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--space-5);
  text-align: center;
}

.lab-intro__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: 6px 14px;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: 999px;
  font-size: 12px;
  letter-spacing: 0.05em;
  color: rgba(255, 255, 255, 0.7);
  margin-bottom: var(--space-5);
}

.lab-intro__title {
  font-family: var(--font-display);
  font-size: clamp(40px, 5.5vw, 64px);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.025em;
  margin-bottom: var(--space-4);
}

.lab-intro__title-en {
  font-size: 20px;
  color: rgba(255, 255, 255, 0.5);
  letter-spacing: -0.005em;
  margin-bottom: var(--space-6);
}

.lab-intro__desc {
  font-size: 17px;
  line-height: 1.6;
  color: rgba(255, 255, 255, 0.7);
  max-width: 640px;
  margin: 0 auto var(--space-7);
}

.lab-projects {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-7);
  margin-top: var(--space-9);
}

.lab-project {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all var(--t-base);
}

.lab-project:hover {
  background: rgba(255, 255, 255, 0.05);
  border-color: rgba(255, 255, 255, 0.15);
  transform: translateY(-2px);
}

.lab-project__inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
}

.lab-project__visual {
  aspect-ratio: 4 / 3;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}

.lab-project--chemlab .lab-project__visual {
  background: linear-gradient(135deg, #6B5BFF 0%, #A88BFF 100%);
}

.lab-project--wensu .lab-project__visual {
  background: linear-gradient(135deg, #C73E5C 0%, #FF6B85 100%);
}

.lab-project--songdiandian .lab-project__visual {
  background: linear-gradient(135deg, #F4A93B 0%, #FFD56B 100%);
}

.lab-project__visual-icon {
  font-size: 96px;
  opacity: 0.8;
  color: #fff;
}

.lab-project__content {
  padding: var(--space-7);
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.lab-project__status {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: 4px 10px;
  background: rgba(45, 91, 255, 0.2);
  border: 1px solid rgba(45, 91, 255, 0.4);
  border-radius: 999px;
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.05em;
  color: var(--color-primary-light);
  margin-bottom: var(--space-4);
  width: fit-content;
}

.lab-project__status-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-primary-light);
  animation: pulse 2s ease-in-out infinite;
}

.lab-project__name {
  font-size: 32px;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-2);
}

.lab-project__name-en {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.5);
  margin-bottom: var(--space-4);
}

.lab-project__desc {
  font-size: 16px;
  line-height: 1.6;
  color: rgba(255, 255, 255, 0.7);
  margin-bottom: var(--space-5);
}

.lab-project__features {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3);
  margin-bottom: var(--space-5);
}

.lab-project__feature {
  display: flex;
  align-items: flex-start;
  gap: var(--space-2);
  font-size: 13px;
  color: rgba(255, 255, 255, 0.7);
}

.lab-project__feature::before {
  content: '→';
  color: var(--color-primary-light);
  font-weight: 600;
  flex-shrink: 0;
}

.lab-project__cta {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: 10px 20px;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 999px;
  font-size: 14px;
  font-weight: 500;
  color: #fff;
  transition: all var(--t-base);
  width: fit-content;
}

.lab-project__cta:hover {
  background: var(--color-primary);
  border-color: var(--color-primary);
  transform: translateY(-1px);
}

/* ============================================
   Blog Page
   ============================================ */
.blog-tabs {
  display: flex;
  justify-content: center;
  gap: var(--space-3);
  margin-bottom: var(--space-7);
  flex-wrap: wrap;
}

.blog-tab {
  padding: 8px 20px;
  background: transparent;
  border: 1px solid var(--color-border);
  border-radius: 999px;
  font-size: 14px;
  font-weight: 500;
  color: var(--color-text-2);
  cursor: pointer;
  transition: all var(--t-base);
}

.blog-tab:hover {
  border-color: var(--color-text);
  color: var(--color-text);
}

.blog-tab.is-active {
  background: var(--color-text);
  border-color: var(--color-text);
  color: #fff;
}

.blog-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-5);
}

.blog-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: all var(--t-base);
  cursor: pointer;
  display: flex;
  flex-direction: column;
}

.blog-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: var(--color-primary-light);
}

.blog-card__cover {
  aspect-ratio: 16 / 10;
  background: var(--color-bg-soft);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}

.blog-card__cover-tag {
  position: absolute;
  top: var(--space-3);
  left: var(--space-3);
  padding: 4px 10px;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  border-radius: 999px;
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.05em;
  color: var(--color-text);
  z-index: 2;
}

.blog-card__body {
  padding: var(--space-5);
  display: flex;
  flex-direction: column;
  flex: 1;
}

.blog-card__date {
  font-size: 12px;
  color: var(--color-text-3);
  margin-bottom: var(--space-2);
  letter-spacing: 0.05em;
}

.blog-card__title {
  font-size: 18px;
  font-weight: 600;
  line-height: 1.4;
  letter-spacing: -0.01em;
  margin-bottom: var(--space-3);
  color: var(--color-text);
}

.blog-card__excerpt {
  font-size: 14px;
  color: var(--color-text-2);
  line-height: 1.6;
  margin-bottom: var(--space-4);
  flex: 1;
}

.blog-card__read {
  font-size: 13px;
  font-weight: 500;
  color: var(--color-primary);
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
}

.blog-card__read-arrow {
  transition: transform var(--t-base);
}

.blog-card:hover .blog-card__read-arrow {
  transform: translateX(4px);
}

.blog-empty {
  text-align: center;
  padding: var(--space-9) var(--space-5);
  color: var(--color-text-2);
}

.blog-empty__icon {
  font-size: 48px;
  margin-bottom: var(--space-4);
  opacity: 0.3;
}

/* ============================================
   About Page
   ============================================ */
.about-section {
  max-width: 720px;
  margin: 0 auto;
  text-align: center;
}

.about-section__title {
  font-family: var(--font-display);
  font-size: clamp(28px, 3.5vw, 40px);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.2;
  margin-bottom: var(--space-5);
}

.about-section__text {
  font-size: 17px;
  line-height: 1.7;
  color: var(--color-text-2);
  margin-bottom: var(--space-5);
  text-align: left;
}

.about-values {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-5);
  margin-top: var(--space-7);
}

.about-value {
  padding: var(--space-6);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  text-align: left;
}

.about-value__icon {
  font-size: 28px;
  margin-bottom: var(--space-4);
}

.about-value__title {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: var(--space-2);
}

.about-value__text {
  font-size: 14px;
  color: var(--color-text-2);
  line-height: 1.6;
}

.about-timeline {
  position: relative;
  max-width: 720px;
  margin: 0 auto;
  padding-left: var(--space-6);
}

.about-timeline::before {
  content: '';
  position: absolute;
  left: 7px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--color-border);
}

.timeline-item {
  position: relative;
  padding-bottom: var(--space-7);
}

.timeline-item:last-child {
  padding-bottom: 0;
}

.timeline-item::before {
  content: '';
  position: absolute;
  left: calc(-1 * var(--space-6) + 1px);
  top: 4px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--color-bg);
  border: 3px solid var(--color-primary);
  box-shadow: 0 0 0 4px var(--color-bg);
}

.timeline-item__date {
  font-size: 13px;
  font-weight: 500;
  color: var(--color-primary);
  letter-spacing: 0.05em;
  margin-bottom: var(--space-2);
}

.timeline-item__title {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: var(--space-2);
}

.timeline-item__desc {
  font-size: 14px;
  color: var(--color-text-2);
  line-height: 1.6;
}

.team-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-5);
}

.team-card {
  text-align: center;
  padding: var(--space-5);
}

.team-card__avatar {
  width: 96px;
  height: 96px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-primary-light), var(--color-primary));
  margin: 0 auto var(--space-4);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 32px;
  font-weight: 600;
}

.team-card__name {
  font-size: 17px;
  font-weight: 600;
  margin-bottom: var(--space-1);
}

.team-card__role {
  font-size: 13px;
  color: var(--color-text-3);
}

/* ============================================
   Contact Page
   ============================================ */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-8);
  max-width: 1000px;
  margin: 0 auto;
}

.contact-channels {
  display: grid;
  gap: var(--space-3);
}

.contact-channel {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  padding: var(--space-5);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  transition: all var(--t-base);
  text-decoration: none;
  color: inherit;
}

.contact-channel:hover {
  border-color: var(--color-primary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

.contact-channel__icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: linear-gradient(135deg, rgba(45, 91, 255, 0.1), rgba(45, 91, 255, 0.04));
  color: var(--color-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.contact-channel__info {
  flex: 1;
}

.contact-channel__label {
  font-size: 13px;
  color: var(--color-text-3);
  margin-bottom: 2px;
}

.contact-channel__value {
  font-size: 15px;
  font-weight: 500;
  color: var(--color-text);
}

.contact-form {
  display: grid;
  gap: var(--space-4);
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.form-label {
  font-size: 13px;
  font-weight: 500;
  color: var(--color-text-2);
}

.form-input,
.form-textarea {
  padding: 12px 16px;
  border: 1px solid var(--color-border);
  border-radius: 12px;
  font-size: 15px;
  font-family: inherit;
  background: var(--color-bg);
  color: var(--color-text);
  transition: border-color var(--t-base);
  width: 100%;
}

.form-input:focus,
.form-textarea:focus {
  outline: none;
  border-color: var(--color-primary);
}

.form-textarea {
  min-height: 140px;
  resize: vertical;
  font-family: inherit;
}

.form-note {
  font-size: 12px;
  color: var(--color-text-3);
  text-align: center;
  margin-top: var(--space-3);
}

/* ============================================
   Animation: Reveal on scroll
   ============================================ */
.reveal {
  opacity: 0;
  transform: translateY(32px);
  transition: opacity var(--t-slow), transform var(--t-spring);
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* Text split reveal (per-word stagger) */
.reveal-text {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity var(--t-slow), transform var(--t-spring);
}

.reveal-text.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* Letter-spacing expand reveal */
.reveal-letters {
  opacity: 0;
  letter-spacing: 0.4em;
  transition: opacity var(--t-slow), letter-spacing 1200ms cubic-bezier(0.16, 1, 0.3, 1);
}

.reveal-letters.is-visible {
  opacity: 1;
  letter-spacing: 0.1em;
}

/* ============================================
   Editorial Components (v2)
   ============================================ */

/* Section number — 章节编号 01, 02, 03... */
.chapter-number {
  display: inline-flex;
  align-items: baseline;
  gap: var(--space-3);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.15em;
  color: var(--color-text-3);
  text-transform: uppercase;
  margin-bottom: var(--space-5);
}

.chapter-number::before {
  content: '';
  display: inline-block;
  width: 32px;
  height: 1px;
  background: var(--color-text-3);
  margin-right: var(--space-1);
}

.chapter-number__label {
  color: var(--color-text-2);
}

.chapter-number__num {
  color: var(--color-ink);
  font-weight: 600;
}

/* Editorial display heading */
.display-heading {
  font-family: var(--font-display);
  font-size: clamp(48px, 7vw, 96px);
  font-weight: 400;
  line-height: 1.02;
  letter-spacing: -0.035em;
  color: var(--color-ink);
}

.display-heading--xl {
  font-size: clamp(56px, 9vw, 128px);
  letter-spacing: -0.04em;
}

/* Editorial subtitle (serif italic) */
.editorial-sub {
  font-family: var(--font-display);
  font-style: italic;
  font-size: clamp(18px, 1.8vw, 24px);
  font-weight: 400;
  line-height: 1.5;
  color: var(--color-text-2);
  letter-spacing: -0.005em;
}

/* Hairline rule */
.hairline {
  width: 100%;
  height: 1px;
  background: var(--color-border);
  margin: var(--space-7) 0;
}

.hairline--vertical {
  width: 1px;
  height: var(--space-9);
  background: var(--color-border);
  display: inline-block;
  margin: 0 var(--space-5);
}

/* Colophon — 文末落款 */
.colophon {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--color-text-3);
  text-transform: uppercase;
  display: flex;
  align-items: center;
  gap: var(--space-3);
  flex-wrap: wrap;
}

.colophon__dot {
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--color-amber);
}

/* Asymmetric grid — 杂志式不对称布局 */
.asymmetric-grid {
  display: grid;
  grid-template-columns: 7fr 5fr;
  gap: var(--space-8);
  align-items: start;
}

.asymmetric-grid--reverse {
  grid-template-columns: 5fr 7fr;
}

.asymmetric-grid--reverse .asymmetric-grid__media {
  order: 2;
}

/* Pull quote (editorial style) */
.pull-quote {
  font-family: var(--font-display);
  font-style: italic;
  font-size: clamp(24px, 2.5vw, 36px);
  line-height: 1.4;
  color: var(--color-ink);
  letter-spacing: -0.01em;
  padding-left: var(--space-5);
  border-left: 2px solid var(--color-amber);
  margin: var(--space-7) 0;
}

/* Index-style list (numbered with hairline) */
.index-list {
  list-style: none;
  counter-reset: index;
}

.index-list__item {
  counter-increment: index;
  display: grid;
  grid-template-columns: 64px 1fr auto;
  align-items: baseline;
  padding: var(--space-5) 0;
  border-top: 1px solid var(--color-border);
  cursor: pointer;
  transition: padding-left var(--t-base);
}

.index-list__item:last-child {
  border-bottom: 1px solid var(--color-border);
}

.index-list__item:hover {
  padding-left: var(--space-3);
}

.index-list__item::before {
  content: counter(index, decimal-leading-zero);
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--color-text-3);
  letter-spacing: 0.05em;
}

.index-list__title {
  font-size: 18px;
  font-weight: 500;
  color: var(--color-ink);
}

.index-list__meta {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--color-text-3);
  letter-spacing: 0.05em;
}

/* Editorial caption (under images) */
.editorial-caption {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--color-text-3);
  text-transform: uppercase;
  margin-top: var(--space-3);
}

/* Center-aligned text */
.text-center { text-align: center; }
.text-balance { text-wrap: balance; }

/* ============================================
   FAQ (GEO · used in index + products)
   ============================================ */
.faq {
  background: var(--color-bg);
}

.faq__list {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.faq-item {
  border-top: 1px solid var(--color-border);
  padding: var(--space-5) 0;
}

.faq-item:last-child {
  border-bottom: 1px solid var(--color-border);
}

.faq-item__q {
  display: flex;
  align-items: baseline;
  gap: var(--space-4);
  cursor: pointer;
  list-style: none;
  padding: var(--space-2) 0;
  font-size: 18px;
  font-weight: 500;
  color: var(--color-ink);
  letter-spacing: -0.01em;
  transition: color var(--t-base);
}

.faq-item__q::-webkit-details-marker {
  display: none;
}

.faq-item__q::marker {
  content: '';
}

.faq-item__q::after {
  content: '+';
  margin-left: auto;
  font-size: 24px;
  color: var(--color-text-3);
  font-weight: 300;
  transition: transform var(--t-base);
}

.faq-item[open] .faq-item__q::after {
  transform: rotate(45deg);
}

.faq-item:hover .faq-item__q {
  color: var(--color-primary);
}

.faq-item__num {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--color-text-3);
  letter-spacing: 0.05em;
  font-weight: 500;
  flex-shrink: 0;
}

.faq-item__a {
  padding: var(--space-3) 0 var(--space-3) calc(16px + var(--space-4));
  color: var(--color-text-2);
  font-size: 15px;
  line-height: 1.7;
}

.faq-item__a p {
  margin-bottom: var(--space-3);
}

.faq-item__a a {
  color: var(--color-primary);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.faq-item__a strong {
  color: var(--color-ink);
  font-weight: 600;
}

/* Breadcrumb (visible UI) */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.05em;
  color: var(--color-text-3);
  text-transform: uppercase;
  padding: var(--space-4) 0;
}

.breadcrumb a {
  color: var(--color-text-2);
  transition: color var(--t-base);
}

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

.breadcrumb__sep {
  color: var(--color-text-3);
  opacity: 0.5;
}

.breadcrumb__current {
  color: var(--color-ink);
}

/* Key Takeaways box (GEO summary) */
.takeaways {
  background: var(--color-paper);
  border: 1px solid var(--color-border-warm);
  border-left: 3px solid var(--color-amber);
  padding: var(--space-6);
  margin: var(--space-7) 0;
  border-radius: 0 var(--radius) var(--radius) 0;
}

.takeaways__title {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-amber);
  margin-bottom: var(--space-3);
  font-weight: 500;
}

.takeaways__list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.takeaways__list li {
  position: relative;
  padding-left: var(--space-5);
  font-size: 15px;
  line-height: 1.6;
  color: var(--color-text-2);
}

.takeaways__list li::before {
  content: '→';
  position: absolute;
  left: 0;
  color: var(--color-amber);
  font-weight: 600;
}

.takeaways__list strong {
  color: var(--color-ink);
  font-weight: 600;
}

/* ============================================
   Responsive
   ============================================ */
@media (max-width: 1024px) {
  .hero__container {
    grid-template-columns: 1fr;
    text-align: center;
    gap: var(--space-7);
  }

  .hero__subtitle {
    margin-left: auto;
    margin-right: auto;
  }

  .hero__cta {
    justify-content: center;
  }

  .hero__visual {
    max-width: 360px;
    margin: 0 auto;
  }

  .hero__phone {
    width: 240px;
  }

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

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

  .lab-project__inner {
    grid-template-columns: 1fr;
  }

  .lab-project__visual {
    aspect-ratio: 16 / 9;
  }

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

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

  .contact-grid {
    grid-template-columns: 1fr;
    gap: var(--space-7);
  }
}

@media (max-width: 768px) {
  :root {
    --space-10: 96px;
    --space-9: 64px;
    --space-8: 48px;
  }

  .nav__menu {
    display: none;
  }

  .nav__burger {
    display: flex;
  }

  .hero {
    min-height: auto;
    padding: var(--space-9) 0 var(--space-8);
  }

  .hero__scroll {
    display: none;
  }

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

  .why-us__grid {
    grid-template-columns: 1fr;
  }

  .about-values {
    grid-template-columns: 1fr;
  }

  .footer__grid {
    grid-template-columns: 1fr;
    gap: var(--space-6);
  }

  .footer__bottom {
    flex-direction: column;
    text-align: center;
  }

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

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

  .lab-project__features {
    grid-template-columns: 1fr;
  }

  .asymmetric-grid,
  .asymmetric-grid--reverse {
    grid-template-columns: 1fr;
  }

  .asymmetric-grid--reverse .asymmetric-grid__media {
    order: 0;
  }

  .index-list__item {
    grid-template-columns: 48px 1fr;
  }

  .index-list__meta {
    display: none;
  }
}

/* ============================================
   Arctica Style (v4) 鈥?cold/mountain theme
   Layered on top of the editorial v2 system
   ============================================ */

/* ============================================
   1. Top dark text-nav bar (Arctica's header strip)
   ============================================ */
.arctica-topbar {
  position: relative;
  z-index: 200;
  background: linear-gradient(180deg, #0F1B2D 0%, #152A40 100%);
  color: #B5C8D8;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  font-family: var(--font-mono);
  letter-spacing: 0.05em;
}

.arctica-topbar__inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--space-5);
  height: 76px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-5);
}

.arctica-topbar__nav {
  display: flex;
  align-items: stretch;
  list-style: none;
  margin: 0;
  padding: 0;
  height: 100%;
}

.arctica-topbar__nav li {
  position: relative;
  height: 100%;
}

.arctica-topbar__nav a {
  display: flex;
  align-items: center;
  height: 100%;
  padding: 0 24px;
  color: #B5C8D8;
  text-decoration: none;
  font-size: 15px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  transition: color var(--t-base), background var(--t-base);
  position: relative;
}

.arctica-topbar__nav a::after {
  content: "";
  position: absolute;
  left: 18px;
  right: 18px;
  bottom: 0;
  height: 2px;
  background: transparent;
  transition: background var(--t-base);
}

.arctica-topbar__nav a:hover {
  color: #FFFFFF;
  background: rgba(90, 157, 208, 0.08);
}

.arctica-topbar__nav a.is-active {
  color: #FFFFFF;
  background: rgba(90, 157, 208, 0.12);
}

.arctica-topbar__nav a.is-active::after {
  background: #5A9DD0;
}

.arctica-topbar__meta {
  display: flex;
  align-items: center;
  gap: 18px;
  font-size: 13px;
}

.arctica-topbar__email {
  color: #B5C8D8;
  text-decoration: none;
  transition: color var(--t-base);
  letter-spacing: 0.04em;
}

.arctica-topbar__email:hover {
  color: #FFFFFF;
}

.arctica-topbar__sep {
  color: rgba(181, 200, 216, 0.25);
  font-size: 10px;
}

.arctica-topbar__wechat {
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #B5C8D8;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.06);
  transition: all var(--t-base);
}

.arctica-topbar__wechat:hover {
  background: #5A9DD0;
  color: #FFFFFF;
  transform: translateY(-1px);
}

/* ============================================
   1.5 White logo strip (Arctica's brand row)
   ============================================ */
.arctica-logobar {
  background: #FFFFFF;
  border-bottom: 1px solid rgba(15, 27, 45, 0.08);
  position: relative;
  z-index: 150;
}

.arctica-logobar__inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 28px var(--space-5);
  display: flex;
  align-items: center;
  gap: 48px;
}

.arctica-logobar__brand {
  display: flex;
  flex-direction: column;
  text-decoration: none;
  color: #0F1B2D;
  flex-shrink: 0;
  line-height: 1;
}

.arctica-logobar__wordmark {
  font-family: var(--font-display);
  font-size: 56px;
  font-weight: 400;
  font-style: italic;
  line-height: 0.9;
  letter-spacing: -0.04em;
  color: #0F1B2D;
}

.arctica-logobar__sub {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: #5A9DD0;
  margin-top: 8px;
}

.arctica-logobar__tagline {
  flex: 1;
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 300;
  line-height: 1.5;
  color: #4A6076;
  border-left: 1px solid rgba(15, 27, 45, 0.12);
  padding-left: 32px;
  min-width: 0;
}

.arctica-logobar__tagline em {
  display: block;
  font-style: italic;
  color: #8FA5BC;
  font-size: 12px;
  letter-spacing: 0.02em;
  margin-top: 4px;
}

.arctica-logobar__socials {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
}

.arctica-logobar__social {
  display: flex;
  align-items: center;
  gap: 6px;
  height: 32px;
  padding: 0 12px;
  border: 1px solid rgba(15, 27, 45, 0.12);
  border-radius: 16px;
  color: #4A6076;
  text-decoration: none;
  font-size: 12px;
  font-weight: 500;
  font-family: var(--font-mono);
  letter-spacing: 0.04em;
  transition: all var(--t-base);
}

.arctica-logobar__social svg {
  flex-shrink: 0;
}

.arctica-logobar__social:hover {
  border-color: #5A9DD0;
  color: #0F1B2D;
  background: rgba(90, 157, 208, 0.04);
  transform: translateY(-1px);
}

/* Legacy navrow kept (used in v4 sub pages) but hidden if empty */
.arctica-navrow {
  display: none;
}

/* ============================================
   3. Full-bleed hero with overlay card
   ============================================ */
.arctica-hero {
  position: relative;
  min-height: 600px;
  height: 70vh;
  max-height: 720px;
  overflow: hidden;
  background: #0F1B2D;
}

.arctica-hero__bg {
  position: absolute;
  inset: 0;
  background-image: url('../assets/hero-mountains.svg');
  background-size: cover;
  background-position: center;
  z-index: 1;
}

.arctica-hero__overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(15, 27, 45, 0.3) 0%, rgba(15, 27, 45, 0.5) 100%);
  z-index: 2;
}

.arctica-hero__container {
  position: relative;
  z-index: 3;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--space-5);
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-7);
}

.arctica-hero__nav {
  display: flex;
  gap: var(--space-2);
  align-items: center;
}

.arctica-hero__nav-btn {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.2);
  color: #FFFFFF;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  cursor: pointer;
  transition: all var(--t-base);
  backdrop-filter: blur(8px);
}

.arctica-hero__nav-btn:hover {
  background: rgba(255, 255, 255, 0.2);
  border-color: rgba(255, 255, 255, 0.4);
}

.arctica-hero__card {
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(12px);
  padding: var(--space-7);
  max-width: 420px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
  border-left: 4px solid #5A9DD0;
}

.arctica-hero__card-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: var(--space-3);
  font-weight: 500;
}

.arctica-hero__card-title {
  font-family: var(--font-display);
  font-size: 36px;
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: -0.025em;
  color: #0F1B2D;
  margin-bottom: var(--space-3);
}

.arctica-hero__card-desc {
  font-size: 14px;
  line-height: 1.6;
  color: #5A7088;
  margin-bottom: var(--space-5);
}

.arctica-hero__card-cta {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: 10px 20px;
  background: #0F1B2D;
  color: #FFFFFF;
  border-radius: 4px;
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  font-family: var(--font-mono);
  transition: all var(--t-base);
}

.arctica-hero__card-cta:hover {
  background: #2D5BFF;
  transform: translateY(-2px);
}

.arctica-hero__scroll {
  position: absolute;
  bottom: var(--space-4);
  left: 50%;
  transform: translateX(-50%);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.2em;
  color: rgba(255, 255, 255, 0.5);
  z-index: 4;
  text-transform: uppercase;
}

/* ============================================
   4. Sub-menu block (text link list under hero)
   ============================================ */
.arctica-submenu {
  background: #FFFFFF;
  padding: var(--space-7) 0;
  border-bottom: 1px solid #E8F0F5;
}

.arctica-submenu__inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--space-5);
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: var(--space-7);
  align-items: start;
}

.arctica-submenu__title {
  font-family: var(--font-display);
  font-size: 24px;
  font-weight: 700;
  color: #0F1B2D;
  margin-bottom: var(--space-3);
  letter-spacing: -0.01em;
}

.arctica-submenu__text {
  font-size: 15px;
  line-height: 1.7;
  color: #5A7088;
  margin-bottom: var(--space-3);
}

.arctica-submenu__text strong {
  color: #0F1B2D;
  font-weight: 600;
}

.arctica-submenu__text a {
  color: #2D5BFF;
  text-decoration: underline;
  text-underline-offset: 3px;
}

.arctica-submenu__list {
  list-style: none;
}

.arctica-submenu__list-title {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: #0F1B2D;
  font-weight: 600;
  margin-bottom: var(--space-4);
  padding-bottom: var(--space-3);
  border-bottom: 1px solid #E8F0F5;
}

.arctica-submenu__list li {
  position: relative;
  padding: 10px 0 10px 18px;
  border-bottom: 1px dashed #E8F0F5;
  font-size: 14px;
}

.arctica-submenu__list li:last-child {
  border-bottom: none;
}

.arctica-submenu__list li::before {
  content: '鈥?;
  position: absolute;
  left: 0;
  top: 10px;
  color: #5A9DD0;
  font-weight: 600;
}

.arctica-submenu__list a {
  color: #0F1B2D;
  transition: color var(--t-base);
}

.arctica-submenu__list a:hover {
  color: #2D5BFF;
}

/* ============================================
   5. Five feature circles (Arctica's middle row)
   ============================================ */
.arctica-features {
  background: #F5F8FB;
  padding: var(--space-9) 0;
  position: relative;
  overflow: hidden;
}

.arctica-features::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(circle at 10% 20%, rgba(90, 157, 208, 0.06), transparent 50%),
    radial-gradient(circle at 90% 80%, rgba(45, 91, 255, 0.04), transparent 50%);
  pointer-events: none;
}

.arctica-features__inner {
  position: relative;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--space-5);
}

.arctica-features__grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: var(--space-4);
}

.arctica-feature {
  text-align: center;
  padding: var(--space-5) var(--space-3);
  transition: all var(--t-base);
  cursor: pointer;
}

.arctica-feature:hover {
  transform: translateY(-4px);
}

.arctica-feature__icon {
  width: 88px;
  height: 88px;
  margin: 0 auto var(--space-4);
  border-radius: 50%;
  background: #FFFFFF;
  border: 2px solid #E8F0F5;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #0F1B2D;
  position: relative;
  transition: all var(--t-base);
  box-shadow: 0 4px 12px rgba(15, 27, 45, 0.04);
}

.arctica-feature__icon::before {
  content: '';
  position: absolute;
  inset: -6px;
  border-radius: 50%;
  border: 1px dashed #C5D5E2;
  opacity: 0;
  transition: opacity var(--t-base);
}

.arctica-feature:hover .arctica-feature__icon {
  border-color: #5A9DD0;
  background: #0F1B2D;
  color: #FFFFFF;
  transform: scale(1.05);
  box-shadow: 0 12px 28px rgba(45, 91, 255, 0.2);
}

.arctica-feature:hover .arctica-feature__icon::before {
  opacity: 1;
  animation: spin-slow 8s linear infinite;
}

@keyframes spin-slow {
  to { transform: rotate(360deg); }
}

.arctica-feature__icon svg {
  width: 44px;
  height: 44px;
}

.arctica-feature__title {
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: #0F1B2D;
  margin-bottom: var(--space-2);
}

.arctica-feature__sub {
  font-size: 13px;
  color: #5A7088;
  line-height: 1.5;
}

/* ============================================
   6. Dark 4-column footer (Arctica's bottom)
   ============================================ */
.arctica-footer {
  background: linear-gradient(180deg, #0F1B2D 0%, #08111E 100%);
  color: #B5C8D8;
  padding: var(--space-9) 0 var(--space-5);
  position: relative;
  overflow: hidden;
}

.arctica-footer::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='200' height='200'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2'/><feColorMatrix values='0 0 0 0 0  0 0 0 0 0  0 0 0 0 0  0 0 0 0.05 0'/></filter><rect width='100%' height='100%' filter='url(%23n)'/></svg>");
  background-size: 200px 200px;
  pointer-events: none;
}

.arctica-footer__inner {
  position: relative;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--space-5);
}

.arctica-footer__grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr 1fr 1.2fr;
  gap: var(--space-7);
  margin-bottom: var(--space-7);
}

.arctica-footer__col-title {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: #FFFFFF;
  margin-bottom: var(--space-4);
  padding-bottom: var(--space-3);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.arctica-footer__list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.arctica-footer__list a {
  font-size: 13px;
  color: #8FA5BC;
  transition: color var(--t-base);
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
}

.arctica-footer__list a::before {
  content: '鈥?;
  color: #5A9DD0;
  font-size: 12px;
}

.arctica-footer__list a:hover {
  color: #FFFFFF;
}

.arctica-footer__news-item {
  display: flex;
  gap: var(--space-3);
  padding: var(--space-3) 0;
  border-bottom: 1px dashed rgba(255, 255, 255, 0.08);
}

.arctica-footer__news-item:last-child {
  border-bottom: none;
}

.arctica-footer__news-thumb {
  width: 48px;
  height: 48px;
  border-radius: 4px;
  background: linear-gradient(135deg, #2C4A6B, #1F3E5C);
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #5A9DD0;
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.05em;
}

.arctica-footer__news-body {
  flex: 1;
}

.arctica-footer__news-title {
  font-size: 12px;
  line-height: 1.4;
  color: #E8F0F5;
  margin-bottom: 4px;
}

.arctica-footer__news-title:hover {
  color: #5A9DD0;
}

.arctica-footer__news-date {
  font-family: var(--font-mono);
  font-size: 10px;
  color: #6B89A8;
  letter-spacing: 0.05em;
}

.arctica-footer__contact-line {
  display: flex;
  align-items: flex-start;
  gap: var(--space-2);
  margin-bottom: var(--space-2);
  font-size: 12px;
  line-height: 1.5;
  color: #8FA5BC;
}

.arctica-footer__contact-line svg {
  width: 14px;
  height: 14px;
  color: #5A9DD0;
  flex-shrink: 0;
  margin-top: 2px;
}

.arctica-footer__contact-line a:hover {
  color: #FFFFFF;
}

.arctica-footer__bottom {
  position: relative;
  padding-top: var(--space-5);
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-3);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.05em;
  color: #6B89A8;
}

.arctica-footer__bottom-links {
  display: flex;
  gap: var(--space-5);
  list-style: none;
}

.arctica-footer__bottom-links a {
  color: #8FA5BC;
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.arctica-footer__bottom-links a:hover {
  color: #FFFFFF;
}

/* ============================================
   Body adjustments for Arctica style
   ============================================ */
body.arctica {
  background: #F5F8FB;
  color: #0F1B2D;
}

body.arctica::before {
  display: none;  /* override the paper grain from v2 */
}

/* ============================================
   Arctica Responsive
   ============================================ */
@media (max-width: 1024px) {
  .arctica-features__grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .arctica-submenu__inner {
    grid-template-columns: 1fr;
    gap: var(--space-5);
  }

  .arctica-footer__grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-5);
  }

  .arctica-hero__container {
    flex-direction: column;
    align-items: flex-start;
    justify-content: center;
    padding-top: var(--space-7);
  }

  .arctica-hero__nav {
    order: 2;
  }

  .arctica-hero__card {
    max-width: 100%;
  }
}

@media (max-width: 768px) {
  .arctica-topbar__counter,
  .arctica-topbar__meta {
    display: none;
  }

  .arctica-topbar__inner {
    justify-content: center;
  }

  .arctica-navrow__inner {
    gap: 4px;
    flex-wrap: wrap;
  }

  .arctica-navrow__item {
    padding: 4px 8px;
    font-size: 10px;
  }

  .arctica-navrow__icon {
    width: 38px;
    height: 38px;
  }

  .arctica-navrow__icon svg {
    width: 18px;
    height: 18px;
  }

  .arctica-features__grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-5);
  }

  .arctica-footer__grid {
    grid-template-columns: 1fr;
  }

  .arctica-footer__bottom {
    flex-direction: column;
    text-align: center;
  }
}



/* ============================================
   Image background utilities (v6)
   Real photography for hero / page-hero / use-case
   ============================================ */

/* Home hero with photography */
.arctica-hero--photo .arctica-hero__bg {
  background-image: url('../assets/img/img-01-milky-lake.jpg');
  background-size: cover;
  background-position: center bottom;
  filter: saturate(0.85) brightness(0.7);
}

.arctica-hero--photo .arctica-hero__overlay {
  background: linear-gradient(135deg, rgba(15, 27, 45, 0.55) 0%, rgba(15, 27, 45, 0.35) 60%, rgba(15, 27, 45, 0.7) 100%);
}

/* Sub-page hero with photography (use on .page-hero) */
.page-hero--photo {
  position: relative;
  background-color: #0F1B2D;
  overflow: hidden;
  padding: 140px 0 100px;
}

.page-hero--photo::before {
  content: "";
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  opacity: 0.65;
  z-index: 0;
  filter: saturate(0.9) brightness(0.8);
}

.page-hero--photo::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(15, 27, 45, 0.5) 0%, rgba(15, 27, 45, 0.75) 100%);
  z-index: 0;
}

.page-hero--photo > * {
  position: relative;
  z-index: 1;
}

.page-hero--photo .page-hero__title,
.page-hero--photo .page-hero__title-en,
.page-hero--photo .page-hero__desc {
  color: #FFFFFF;
}

.page-hero--photo .chapter-number__num {
  color: #5A9DD0;
}

.page-hero--photo .chapter-number__label {
  color: #B5C8D8;
}

/* Individual page-hero backgrounds */
.page-hero--photo--startrails::before    { background-image: url('../assets/img/img-03-startrails.jpg'); background-position: center 30%; }
.page-hero--photo--milky-tree::before    { background-image: url('../assets/img/img-04-milky-tree.jpg'); background-position: center 40%; }
.page-hero--photo--code-review::before   { background-image: url('../assets/img/img-05-code-review.jpg'); background-position: center; }
.page-hero--photo--code-closeup::before  { background-image: url('../assets/img/img-06-code-closeup.jpg'); background-position: center; }
.page-hero--photo--hands-code::before    { background-image: url('../assets/img/img-08-hands-code.jpg'); background-position: center; }

/* Use case with photography */
.use-case--campus {
  background:
    linear-gradient(135deg, rgba(10, 31, 61, 0.55) 0%, rgba(45, 91, 255, 0.55) 100%),
    url('../assets/img/img-06-code-closeup.jpg') center/cover;
  background-blend-mode: normal;
}

.use-case--family {
  background:
    linear-gradient(135deg, rgba(0, 50, 40, 0.4) 0%, rgba(0, 60, 90, 0.4) 100%),
    url('../assets/img/img-02-milky-tents.jpg') center/cover;
}

.use-case__overlay {
  background: linear-gradient(to top, rgba(0, 0, 0, 0.7) 0%, rgba(0, 0, 0, 0.1) 60%, transparent 100%);
}

/* Inline product image strip (products page) */
.product-feature-image {
  position: relative;
  width: 100%;
  height: 320px;
  border-radius: var(--radius-lg);
  overflow: hidden;
  margin: var(--space-6) 0;
  background-size: cover;
  background-position: center;
}

.product-feature-image--tree {
  background-image: linear-gradient(180deg, rgba(15, 27, 45, 0.2) 0%, rgba(15, 27, 45, 0.4) 100%),
    url('../assets/img/img-04-milky-tree.jpg') center/cover;
}

.product-feature-image::after {
  content: attr(data-label);
  position: absolute;
  bottom: 24px;
  left: 24px;
  color: #FFFFFF;
  font-family: var(--font-display);
  font-size: 20px;
  font-style: italic;
  font-weight: 400;
  letter-spacing: 0.02em;
  text-shadow: 0 2px 12px rgba(0, 0, 0, 0.6);
}

/* Lab inline image (Chem Lab / 实验室 hero aside) */
.lab-feature-image {
  position: relative;
  width: 100%;
  height: 280px;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background-size: cover;
  background-position: center;
  margin: var(--space-5) 0;
}

.lab-feature-image--review {
  background-image: linear-gradient(135deg, rgba(15, 27, 45, 0.3) 0%, rgba(15, 27, 45, 0.5) 100%),
    url('../assets/img/img-05-code-review.jpg') center/cover;
}

/* About page inline image */
.about-feature-image {
  position: relative;
  width: 100%;
  height: 360px;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background-size: cover;
  background-position: center;
  margin: var(--space-5) 0;
}

.about-feature-image--hands {
  background-image: linear-gradient(135deg, rgba(15, 27, 45, 0.4) 0%, rgba(15, 27, 45, 0.55) 100%),
    url('../assets/img/img-08-hands-code.jpg') center/cover;
}

.about-feature-image--milky {
  background-image: linear-gradient(180deg, rgba(15, 27, 45, 0.3) 0%, rgba(15, 27, 45, 0.5) 100%),
    url('../assets/img/img-01-milky-lake.jpg') center/cover;
}


/* ============================================
   Lab intro photo variant (lab.html)
   ============================================ */
.lab-intro--photo {
  position: relative;
  overflow: hidden;
  background: #0F1B2D;
}

.lab-intro--photo::before {
  content: "";
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center 40%;
  opacity: 0.7;
  filter: saturate(0.9) brightness(0.75);
  z-index: 0;
}

.lab-intro--photo::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(15, 27, 45, 0.4) 0%, rgba(15, 27, 45, 0.7) 100%);
  z-index: 0;
}

.lab-intro--photo .lab-intro__container {
  position: relative;
  z-index: 1;
}

.lab-intro--photo .lab-intro__title,
.lab-intro--photo .lab-intro__title-en,
.lab-intro--photo .lab-intro__desc {
  color: #FFFFFF;
}

.lab-intro--photo--milky-tree::before {
  background-image: url('../assets/img/img-04-milky-tree.jpg');
}


/* ============================================
   Logobar responsive (v7 patch)
   ============================================ */
@media (max-width: 900px) {
  .arctica-logobar__inner {
    flex-wrap: wrap;
    gap: 20px;
  }
  .arctica-logobar__tagline {
    flex: 1 1 100%;
    order: 3;
    border-left: none;
    border-top: 1px solid rgba(15, 27, 45, 0.08);
    padding-left: 0;
    padding-top: 12px;
  }
  .arctica-logobar__wordmark {
    font-size: 42px;
  }
}

@media (max-width: 560px) {
  .arctica-logobar__socials {
    flex-wrap: wrap;
  }
  .arctica-logobar__social {
    font-size: 11px;
    padding: 0 10px;
    height: 28px;
  }
}