:root {
  --bg: #f6f1ea;
  --bg-alt: #fefbf7;
  --surface: rgba(255, 255, 255, 0.82);
  --surface-strong: rgba(255, 255, 255, 0.95);
  --primary: #ff7a66;
  --primary-dark: #ff6247;
  --secondary: #2ba6a4;
  --accent: #ffd166;
  --text: #352f2b;
  --text-muted: #6f655f;
  --shadow: 0 12px 40px rgba(53, 47, 43, 0.08);
  --radius-lg: 32px;
  --radius-md: 20px;
  --radius-sm: 12px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: 'Noto Sans SC', 'Inter', 'Source Han Sans SC', 'Microsoft YaHei', sans-serif;
  color: var(--text);
  background: radial-gradient(circle at 8% 12%, rgba(255, 215, 156, 0.35), transparent 55%),
    radial-gradient(circle at 88% 6%, rgba(171, 227, 231, 0.35), transparent 45%),
    var(--bg);
  background-attachment: fixed;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

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

a:hover,
a:focus {
  color: var(--primary);
}

img {
  max-width: 100%;
  display: block;
}

.container {
  width: min(1080px, 90vw);
  margin: 0 auto;
}

.section {
  scroll-margin-top: 140px;
}

.hero {
  position: relative;
  padding: 32px 0 96px;
  background: linear-gradient(135deg, rgba(255, 208, 186, 0.55), rgba(196, 240, 239, 0.45), rgba(255, 246, 230, 0.55));
  overflow: hidden;
}

.hero h2 {
  font-size: clamp(2.0rem, 1vw, 2.8rem);
}

.nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 24px;
  border-radius: var(--radius-md);
  background: var(--surface);
  box-shadow: 0 24px 46px rgba(0, 0, 0, 0.04);
  position: sticky;
  top: 24px;
  backdrop-filter: blur(12px);
  z-index: 10;
}

.nav-controls {
  display: flex;
  align-items: center;
  gap: 20px;
}

.logo {
  font-weight: 700;
  font-size: 1.1rem;
  letter-spacing: 0.06em;
}

.nav-links {
  display: flex;
  gap: 20px;
  align-items: center;
  font-size: 0.95rem;
}

.nav-links a {
  padding: 8px 16px;
  border-radius: 999px;
  transition: background 0.3s ease, color 0.3s ease, transform 0.3s ease;
}

.nav-links a:hover {
  background: rgba(0, 0, 0, 0.05);
  transform: translateY(-2px);
}

.lang-toggle {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px;
  border-radius: 999px;
  background: rgba(0, 0, 0, 0.05);
}

.lang-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: none;
  background: transparent;
  color: inherit;
  font-size: 0.85rem;
  font-weight: 600;
  padding: 6px 12px;
  border-radius: 999px;
  cursor: pointer;
  transition: background 0.3s ease, color 0.3s ease, box-shadow 0.3s ease;
  text-decoration: none;
}

.lang-btn:hover,
.lang-btn:focus {
  color: var(--primary);
}

.lang-btn:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}

.lang-btn.active {
  background: #ffffff;
  color: var(--primary);
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.08);
}

.hero-content {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 56px;
  align-items: center;
  padding-top: 80px;
}

.hero-text h1 {
  font-size: clamp(2.5rem, 4vw, 3.5rem);
  line-height: 1.1;
  margin-bottom: 24px;
}

.hero-text p {
  font-size: 1.1rem;
  color: var(--text-muted);
  max-width: 520px;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  font-size: 0.85rem;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.65);
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.hero-actions {
  margin-top: 32px;
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 14px 28px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.98rem;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
  border: none;
  cursor: pointer;
}

.btn.primary {
  margin-top: 10px;
  background: var(--primary);
  color: #fff;
  box-shadow: 0 16px 32px rgba(255, 122, 102, 0.25);
}

.btn.primary:hover {
  transform: translateY(-3px);
  background: var(--primary-dark);
}

.btn.ghost {
  background: transparent;
  border: 1px solid rgba(53, 47, 43, 0.12);
  color: var(--text);
}

.btn.ghost:hover {
  border-color: transparent;
  background: rgba(255, 255, 255, 0.7);
}

.hero-art {
  position: relative;
  min-height: 340px;
}

.hero-art .shape {
  position: absolute;
  border-radius: 999px;
  filter: blur(0px);
  opacity: 0.65;
}

.hero-art .shape.slow {
  width: 260px;
  height: 260px;
  background: linear-gradient(135deg, rgba(255, 184, 156, 0.8), rgba(255, 239, 198, 0.7));
  top: 50px;
  right: 60px;
  animation: float 12s ease-in-out infinite;
}

.hero-art .shape.medium {
  width: 200px;
  height: 200px;
  background: linear-gradient(135deg, rgba(171, 227, 231, 0.8), rgba(255, 214, 102, 0.7));
  top: 160px;
  right: 0;
  animation: float 10s ease-in-out infinite reverse;
}

.hero-art .shape.fast {
  width: 140px;
  height: 140px;
  background: linear-gradient(135deg, rgba(255, 122, 102, 0.8), rgba(255, 214, 102, 0.8));
  top: 0;
  right: 160px;
  animation: float 8s ease-in-out infinite;
}

.orbit {
  position: absolute;
  inset: 0;
  border: 1.5px dashed rgba(53, 47, 43, 0.12);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.2em;
  color: rgba(53, 47, 43, 0.45);
  rotate: -8deg;
  padding: 24px;
}

.orbit span {
  padding: 0 12px;
}

.section {
  padding: 80px 0;
}

.section-heading {
  max-width: 640px;
  margin-bottom: 24px;
}

.section-heading h2 {
  font-size: clamp(2rem, 3vw, 2.6rem);
  margin-top: 0px;
  margin-bottom: 12px;
}

.section-heading p {
  color: var(--text-muted);
}

.lab-notes,
.lab-future {
  margin: 0 auto;
  display: grid;
  gap: 28px;
}

.note {
  display: grid;
  gap: 10px;
}

.note h3 {
  margin: 0;
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--text);
}

.note p {
  margin: 0;
  color: var(--text-muted);
}

.note p + p {
  margin-top: 4px;
}

.note strong {
  color: var(--text);
}

.section-highlight {
  position: relative;
  background: linear-gradient(135deg, rgba(255, 240, 227, 0.85), rgba(206, 244, 242, 0.9));
  overflow: hidden;
}

.section-highlight::after {
  content: '';
  position: absolute;
  inset: 0;
  background: url('data:image/svg+xml,%3Csvg width="400" height="400" viewBox="0 0 400 400" xmlns="http://www.w3.org/2000/svg"%3E%3Cdefs%3E%3ClinearGradient id="g" x1="0" y1="0" x2="1" y2="1"%3E%3Cstop stop-color="%23ffd166" stop-opacity="0.25"/%3E%3Cstop offset="1" stop-color="%23ff7a66" stop-opacity="0.05"/%3E%3C/linearGradient%3E%3C/defs%3E%3Ccircle cx="50" cy="50" r="30" fill="url(%23g)" opacity="0.6"/%3E%3Ccircle cx="220" cy="140" r="20" fill="url(%23g)" opacity="0.45"/%3E%3Ccircle cx="340" cy="240" r="26" fill="url(%23g)" opacity="0.35"/%3E%3C/svg%3E') repeat;
  opacity: 0.5;
  pointer-events: none;
}

.section-highlight .product {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 2fr) minmax(0, 1fr);
  gap: 48px;
  align-items: stretch;
  z-index: 1;
}

.product-copy {
  display: flex;
  flex-direction: column;
  gap: 12px;
  height: 100%;
}

.product-copy p {
  color: var(--text-muted);
}

.feature-box {
  background: rgba(255, 255, 255, 0.8);
  border-radius: var(--radius-md);
  border: 1px solid rgba(53, 47, 43, 0.08);
  padding: 20px 24px;
}

.feature-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 10px;
}

.feature-list li {
  margin: 0;
  color: var(--text-muted);
  display: flex;
  align-items: flex-start;
  gap: 12px;
  flex-wrap: wrap;
}

.feature-list li::before {
  content: '•';
  color: var(--primary);
  line-height: 1;
  margin-top: 4px;
}

.feature-list li strong {
  color: var(--text);
  min-width: 168px;
  line-height: 1.5;
}

.product-actions {
  margin-top: auto;
}

.product-art {
  display: flex;
  justify-content: flex-end;
  align-items: stretch;
}

.product-title {
  font-size: 1.8rem;
  font-weight: bold;
  margin: 20px 0 0 0;
}

.product-hint { 
  margin: 0;
  color: var(--text-muted);
}

.product-card {
  position: relative;
  width: min(340px, 100%);
  background: rgba(255, 255, 255, 0.75);
  border-radius: var(--radius-lg);
  padding: 28px;
  box-shadow: 0 26px 48px rgba(255, 122, 102, 0.16);
  backdrop-filter: blur(18px);
  display: flex;
  flex-direction: column;
  gap: 16px;
  height: 100%;
}

.card-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(43, 166, 164, 0.15);
  color: var(--secondary);
  font-size: 0.8rem;
  padding: 6px 12px;
  border-radius: 999px;
}

.stats {
  display: flex;
  gap: 18px;
  flex-wrap: wrap;
}

.stats > div {
  flex: 1 1 120px;
}

.stat-label {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
}

.stat-value {
  display: block;
  font-size: 1.4rem;
  font-weight: 600;
  color: var(--text);
}

.card-footer {
  margin-top: auto;
}

.card-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--text-muted);
  font-weight: 500;
  transition: color 0.2s ease;
}

.card-link span {
  transition: transform 0.2s ease;
}

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

.card-link:hover span {
  transform: translateX(4px);
}

.section-quote {
  background: var(--bg-alt);
  padding: 88px 0;
}

.quote {
  display: grid;
  gap: 24px;
  align-items: center;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

blockquote {
  margin: 0;
  padding: 28px;
  background: var(--surface-strong);
  border-left: 6px solid var(--primary);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow);
  font-size: 1.25rem;
}

blockquote footer {
  display: block;
  margin-top: 16px;
  font-size: 0.85rem;
  color: var(--text-muted);
  text-align: right;
}

.quote > p {
  color: var(--text-muted);
}

.connect {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 36px;
  align-items: center;
  background: var(--surface);
  padding: 40px;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
}

.connect-copy h2 {
  margin-top: 0;
}

.connect-copy p {
  color: var(--text-muted);
}

.connect-action {
  display: flex;
  flex-direction: column;
  gap: 12px;
  align-items: flex-start;
}

.contact-hint {
  font-size: 0.85rem;
  color: rgba(53, 47, 43, 0.55);
}

.footer {
  background: #26211e;
  color: rgba(255, 255, 255, 0.78);
  padding: 64px 0 32px;
}

.footer-inner {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 24px;
  align-items: start;
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.footer-links a {
  color: rgba(255, 255, 255, 0.78);
  transition: color 0.3s ease;
}

.footer-links a:hover {
  color: #fff;
}

.footer-note {
  grid-column: 1 / -1;
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.55);
  margin: 12px 0 0;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

@keyframes float {
  0% {
    transform: translate3d(0, 0, 0);
  }
  50% {
    transform: translate3d(0, -16px, 0);
  }
  100% {
    transform: translate3d(0, 0, 0);
  }
}

@media (max-width: 960px) {
  .nav {
    position: static;
    flex-direction: column;
    gap: 12px;
  }

  .nav-controls {
    flex-direction: column;
    gap: 12px;
  }

  .nav-links {
    flex-wrap: wrap;
    justify-content: center;
  }

  .hero-content,
  .section-highlight .product,
  .quote,
  .connect {
    grid-template-columns: 1fr;
  }

  .hero-content {
    gap: 40px;
  }

  .hero-text {
    text-align: center;
  }

  .hero-text p {
    margin-left: auto;
    margin-right: auto;
  }

  .hero-actions {
    justify-content: center;
  }

  .hero-art {
    min-height: 280px;
    max-width: 320px;
    margin: 40px auto 0;
  }

  .section-highlight .product {
    gap: 40px;
  }

  .product-art {
    justify-content: center;
  }

  .product-card {
    width: min(360px, 100%);
  }

}

@media (max-width: 640px) {
  body {
    background: var(--bg);
  }

  .hero {
    padding-bottom: 64px;
  }

  .section {
    padding: 72px 0;
  }

  .hero-content {
    padding-top: 48px;
  }

  .hero-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .hero-actions .btn {
    width: 100%;
  }

  .hero-art {
    display: none;
  }

  .feature-list {
    grid-template-columns: 1fr;
  }

  .feature-box {
    padding: 18px 20px;
  }

  .feature-list li {
    display: block;
    position: relative;
    padding-left: 20px;
  }

  .feature-list li strong {
    flex: none;
    min-width: auto;
    display: block;
    margin-bottom: 2px;
  }

  .feature-list li::before {
    position: absolute;
    left: 0;
    top: 10px;
    margin-top: 0;
  }

  .product-card {
    padding: 24px;
  }

  .product-actions {
    display: flex;
    justify-content: center;
  }

  .connect {
    padding: 28px;
  }

  .footer {
    margin-top: 64px;
  }
}