:root {
  --ink: #16232b;
  --muted: #60717b;
  --line: #d9e1e2;
  --paper: #f8faf7;
  --panel: #ffffff;
  --teal: #1f817d;
  --teal-dark: #155d60;
  --mint: #dff2ea;
  --coral: #e47b62;
  --gold: #d6ad4f;
  --charcoal: #24313a;
  --shadow: 0 22px 70px rgba(32, 49, 58, 0.16);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: "Inter", "Segoe UI", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
  letter-spacing: 0;
}

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

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

.site-header {
  position: fixed;
  z-index: 20;
  top: 0;
  left: 0;
  right: 0;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 28px;
  padding: 18px clamp(18px, 4vw, 56px);
  background: rgba(248, 250, 247, 0.83);
  border-bottom: 1px solid rgba(217, 225, 226, 0.74);
  backdrop-filter: blur(18px);
}

.site-header.scrolled {
  box-shadow: 0 10px 34px rgba(34, 53, 62, 0.08);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  font-size: 18px;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: var(--charcoal);
  color: white;
  font-size: 12px;
  letter-spacing: 0;
}

.nav-links {
  justify-self: center;
  display: flex;
  align-items: center;
  gap: 28px;
  color: var(--muted);
  font-size: 15px;
}

.nav-links a {
  padding: 8px 0;
}

.nav-links a:hover {
  color: var(--ink);
}

.header-tools {
  display: inline-flex;
  align-items: center;
  gap: 12px;
}

.language-picker {
  display: inline-grid;
  gap: 3px;
  color: var(--muted);
  font-size: 11px;
  font-weight: 800;
  text-transform: uppercase;
}

.language-picker select {
  width: 210px;
  height: 38px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 0 10px;
  background: white;
  color: var(--ink);
  font: inherit;
  font-size: 13px;
  text-transform: none;
}

.header-action,
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 44px;
  border: 0;
  border-radius: 8px;
  font: inherit;
  font-weight: 700;
  cursor: pointer;
  white-space: nowrap;
}

.header-action {
  padding: 0 18px;
  background: var(--ink);
  color: white;
}

.button {
  padding: 0 20px;
}

.button-primary {
  background: var(--teal);
  color: white;
  box-shadow: 0 16px 38px rgba(31, 129, 125, 0.22);
}

.button-secondary {
  border: 1px solid var(--line);
  background: white;
  color: var(--ink);
}

.button:hover,
.header-action:hover {
  transform: translateY(-1px);
}

.menu-button {
  display: none;
  width: 44px;
  height: 44px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: white;
  cursor: pointer;
}

.menu-button span {
  display: block;
  width: 18px;
  height: 2px;
  margin: 5px auto;
  background: var(--ink);
}

.hero {
  min-height: 92vh;
  padding: 128px clamp(18px, 5vw, 72px) 54px;
  display: grid;
  grid-template-columns: minmax(320px, 0.84fr) minmax(420px, 1.16fr);
  gap: clamp(30px, 5vw, 72px);
  align-items: center;
  background:
    linear-gradient(90deg, rgba(248, 250, 247, 0.98) 0%, rgba(248, 250, 247, 0.9) 42%, rgba(218, 234, 230, 0.7) 100%),
    radial-gradient(circle at 80% 40%, rgba(228, 123, 98, 0.22), transparent 30%);
}

.hero-copy {
  max-width: 690px;
}

.eyebrow {
  margin: 0 0 14px;
  color: var(--teal-dark);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: 24px;
  font-size: clamp(42px, 6.2vw, 86px);
  line-height: 1.02;
  max-width: 780px;
}

.hero-lede {
  max-width: 630px;
  color: #465c66;
  font-size: clamp(17px, 2vw, 21px);
  line-height: 1.75;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  margin: 44px 0 0;
}

.hero-stats div {
  padding: 18px 0;
  border-top: 1px solid var(--line);
}

.hero-stats dt {
  font-size: clamp(25px, 3vw, 38px);
  font-weight: 850;
  line-height: 1;
}

.hero-stats dd {
  margin: 8px 0 0;
  color: var(--muted);
  font-size: 14px;
}

.hero-media {
  border-radius: 8px;
  overflow: hidden;
  box-shadow: var(--shadow);
  background: #d6e2df;
}

.hero-media img {
  width: 100%;
  aspect-ratio: 1.55 / 1;
  object-fit: cover;
}

.trust-strip {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
  padding: 18px clamp(18px, 4vw, 56px);
  background: var(--charcoal);
  color: #eef6f3;
}

.trust-strip span {
  padding: 9px 16px;
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 999px;
  font-size: 14px;
}

.language-section {
  background: #fbfaf5;
}

.language-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
}

.language-grid article {
  min-height: 190px;
  padding: 24px;
  border: 1px solid rgba(217, 225, 226, 0.85);
  border-radius: 8px;
  background: white;
}

.language-grid span {
  display: inline-grid;
  place-items: center;
  width: 44px;
  height: 34px;
  margin-bottom: 22px;
  border-radius: 8px;
  background: var(--mint);
  color: var(--teal-dark);
  font-weight: 850;
}

.language-grid h3 {
  margin-bottom: 9px;
  font-size: 21px;
}

.language-grid p {
  color: var(--muted);
  line-height: 1.65;
}

.section {
  padding: clamp(68px, 8vw, 118px) clamp(18px, 5vw, 72px);
}

.section-heading {
  max-width: 760px;
  margin-bottom: 40px;
}

.section-heading.compact {
  max-width: 620px;
}

.section-heading h2,
.scenario h2,
.contact h2 {
  margin-bottom: 16px;
  font-size: clamp(32px, 4vw, 56px);
  line-height: 1.12;
}

.section-heading p,
.scenario p,
.contact p {
  color: var(--muted);
  font-size: 17px;
  line-height: 1.75;
}

.product-layout {
  display: grid;
  grid-template-columns: minmax(340px, 1fr) minmax(330px, 440px);
  gap: clamp(24px, 4vw, 54px);
  align-items: stretch;
}

.product-layout > img {
  width: 100%;
  height: 100%;
  min-height: 420px;
  object-fit: cover;
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.product-panel {
  padding: 28px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: white;
}

.model-tabs {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 8px;
  margin-bottom: 24px;
}

.model-tab {
  min-height: 42px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #f7f9f8;
  color: var(--muted);
  font: inherit;
  font-weight: 700;
  cursor: pointer;
}

.model-tab.active {
  border-color: var(--teal);
  background: var(--mint);
  color: var(--teal-dark);
}

.model-card h3 {
  margin-bottom: 14px;
  font-size: 32px;
}

.model-kicker {
  color: var(--coral);
  font-size: 13px;
  font-weight: 800;
}

.model-card p,
.model-card li {
  color: var(--muted);
  line-height: 1.7;
}

.model-card ul {
  display: grid;
  gap: 9px;
  margin: 22px 0 28px;
  padding-left: 20px;
}

.feature-section {
  background: #eef4f0;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
}

.feature-grid article,
.service-grid div {
  min-height: 220px;
  padding: 26px;
  border: 1px solid rgba(217, 225, 226, 0.75);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.74);
}

.feature-icon {
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  margin-bottom: 22px;
  border-radius: 50%;
  background: var(--charcoal);
  color: white;
  font-size: 21px;
}

.feature-grid h3,
.service-grid h3 {
  margin-bottom: 10px;
  font-size: 21px;
}

.feature-grid p,
.service-grid p {
  color: var(--muted);
  line-height: 1.7;
}

.scenario {
  display: grid;
  grid-template-columns: minmax(360px, 1.1fr) minmax(300px, 0.9fr);
  gap: clamp(28px, 5vw, 70px);
  align-items: center;
  padding: clamp(68px, 8vw, 112px) clamp(18px, 5vw, 72px);
  background: #fbfaf5;
}

.scenario img {
  width: 100%;
  aspect-ratio: 1.45 / 1;
  object-fit: cover;
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.compare-section {
  background: white;
}

.spec-table {
  border: 1px solid var(--line);
  border-radius: 8px;
  overflow: hidden;
  background: white;
}

.spec-table [role="row"] {
  display: grid;
  grid-template-columns: 1.05fr repeat(3, minmax(150px, 1fr));
  min-width: 720px;
}

.spec-table [role="row"] + [role="row"] {
  border-top: 1px solid var(--line);
}

.spec-table span {
  padding: 18px 20px;
  color: var(--muted);
}

.spec-table [role="columnheader"],
.spec-table [role="row"] span:first-child {
  color: var(--ink);
  font-weight: 800;
}

.service-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.service-grid strong {
  color: var(--gold);
  font-size: 32px;
}

.contact {
  display: grid;
  grid-template-columns: minmax(300px, 0.9fr) minmax(320px, 1.1fr);
  gap: clamp(28px, 5vw, 76px);
  padding: clamp(72px, 8vw, 120px) clamp(18px, 5vw, 72px);
  background: var(--charcoal);
  color: white;
}

.contact .eyebrow,
.contact p {
  color: #cfe4dc;
}

.contact-form {
  display: grid;
  gap: 16px;
  padding: 28px;
  border-radius: 8px;
  background: white;
  color: var(--ink);
}

.contact-form label {
  display: grid;
  gap: 8px;
  font-size: 14px;
  font-weight: 800;
}

.contact-form input,
.contact-form select,
.contact-form textarea {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 13px 14px;
  color: var(--ink);
  font: inherit;
  resize: vertical;
}

.contact-form input:focus,
.contact-form select:focus,
.contact-form textarea:focus {
  outline: 2px solid rgba(31, 129, 125, 0.24);
  border-color: var(--teal);
}

.form-note {
  margin: 0;
  color: var(--muted);
  font-size: 13px;
}

.site-footer {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding: 24px clamp(18px, 5vw, 72px);
  background: #111b20;
  color: #c7d2d4;
  font-size: 14px;
}

@media (max-width: 980px) {
  .site-header {
    grid-template-columns: auto auto;
    justify-content: space-between;
  }

  .nav-links,
  .header-tools {
    display: none;
  }

  .menu-button {
    display: block;
  }

  .site-header.open .nav-links {
    position: absolute;
    top: 70px;
    left: 18px;
    right: 18px;
    display: grid;
    gap: 0;
    padding: 10px;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: white;
    box-shadow: var(--shadow);
  }

  .site-header.open .nav-links a {
    padding: 14px;
  }

  .site-header.open .header-tools {
    position: absolute;
    top: 278px;
    left: 18px;
    right: 18px;
    display: grid;
    gap: 10px;
    padding: 10px;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: white;
    box-shadow: var(--shadow);
  }

  .site-header.open .language-picker select {
    width: 100%;
  }

  .hero,
  .product-layout,
  .scenario,
  .contact {
    grid-template-columns: 1fr;
  }

  .hero {
    padding-top: 104px;
  }

  .hero-media {
    order: -1;
  }

  .feature-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .language-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

  .spec-table {
    overflow-x: auto;
  }
}

@media (max-width: 620px) {
  .hero-stats {
    grid-template-columns: 1fr;
  }

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

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

  .model-tabs {
    grid-template-columns: 1fr;
  }

  .product-panel,
  .contact-form {
    padding: 20px;
  }

  .site-footer {
    flex-direction: column;
  }
}