:root {
  --bg: #f7fafc;
  --surface: #ffffff;
  --surface-dark: #0f172a;
  --text: #152238;
  --muted: #64748b;
  --line: #dbe4ef;
  --blue: #1d4ed8;
  --blue-dark: #123a8c;
  --orange: #f97316;
  --cyan: #0891b2;
  --shadow: 0 20px 60px rgba(15, 23, 42, 0.12);
  --radius: 28px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
}

body.menu-open {
  overflow: hidden;
}

a {
  color: var(--blue);
  text-decoration: none;
}

a:hover {
  color: var(--blue-dark);
}

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

.container {
  width: min(1180px, calc(100% - 40px));
  margin: 0 auto;
}

.narrow {
  max-width: 900px;
}

.section {
  padding: 92px 0;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
  width: min(1180px, calc(100% - 32px));
  margin: 14px auto 0;
  padding: 14px 16px;
  border: 1px solid rgba(219, 228, 239, 0.9);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.92);
  box-shadow: 0 12px 30px rgba(15, 23, 42, 0.08);
  backdrop-filter: blur(16px);
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--surface-dark);
  font-size: 18px;
  font-weight: 800;
  letter-spacing: -0.02em;
}

.logo:hover {
  color: var(--surface-dark);
}

.logo-mark {
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  border-radius: 14px;
  color: #fff;
  background: linear-gradient(135deg, var(--blue), var(--cyan));
  font-size: 14px;
}

.nav {
  display: flex;
  align-items: center;
  gap: 18px;
  font-size: 14px;
  font-weight: 650;
}

.nav a:not(.btn) {
  color: #334155;
}

.menu-toggle {
  display: none;
  width: 44px;
  height: 44px;
  border: 0;
  border-radius: 14px;
  background: #eef6ff;
  cursor: pointer;
}

.menu-toggle span {
  display: block;
  width: 20px;
  height: 2px;
  margin: 5px auto;
  border-radius: 999px;
  background: var(--surface-dark);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 14px 22px;
  border: 1px solid transparent;
  border-radius: 999px;
  color: #fff;
  background: linear-gradient(135deg, var(--blue), var(--cyan));
  box-shadow: 0 12px 28px rgba(29, 78, 216, 0.25);
  font-weight: 750;
  text-align: center;
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

.btn:hover {
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 18px 34px rgba(29, 78, 216, 0.28);
}

.btn-small {
  min-height: 40px;
  padding: 10px 16px;
  font-size: 13px;
}

.btn-ghost {
  color: var(--blue);
  background: #fff;
  border-color: rgba(29, 78, 216, 0.2);
  box-shadow: none;
}

.btn-ghost:hover {
  color: var(--blue-dark);
  border-color: rgba(29, 78, 216, 0.45);
  box-shadow: 0 14px 28px rgba(15, 23, 42, 0.08);
}

.btn-ghost.light {
  color: #fff;
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.35);
}

.hero {
  padding-top: 78px;
  background:
    radial-gradient(circle at 15% 18%, rgba(29, 78, 216, 0.12), transparent 30%),
    radial-gradient(circle at 85% 10%, rgba(249, 115, 22, 0.12), transparent 28%);
}

.hero-grid,
.two-columns,
.equipment-grid,
.tongda-card,
.footer-grid {
  display: grid;
  gap: 44px;
}

.hero-grid {
  grid-template-columns: minmax(0, 1fr) minmax(390px, 0.92fr);
  align-items: center;
}

.hero-copy,
.hero-media,
.two-columns > *,
.equipment-grid > *,
.tongda-card > * {
  min-width: 0;
}

.hero-copy h1,
.section-head h2,
.intro h2,
.equipment h2,
.seo h2,
.tongda h2,
.final-cta h2 {
  margin: 0;
  color: #0f172a;
  letter-spacing: -0.04em;
  line-height: 1.05;
}

.hero-copy h1 {
  max-width: 780px;
  font-size: clamp(42px, 7vw, 82px);
  overflow-wrap: break-word;
  hyphens: auto;
}

.lead {
  max-width: 670px;
  margin: 24px 0 0;
  color: #334155;
  font-size: clamp(18px, 2.1vw, 22px);
}

.eyebrow {
  margin: 0 0 14px;
  color: var(--orange);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 34px;
}

.hero-facts {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  margin: 36px 0 0;
  padding: 0;
  list-style: none;
}

.hero-facts li {
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 22px;
  background: rgba(255, 255, 255, 0.7);
}

.hero-facts strong,
.hero-facts span {
  display: block;
}

.hero-facts strong {
  color: #0f172a;
  font-size: 22px;
}

.hero-facts span {
  color: var(--muted);
  font-size: 14px;
}

.hero-media {
  position: relative;
}

.hero-media::before {
  position: absolute;
  inset: 11% -3% -4% 6%;
  z-index: -1;
  border-radius: 36px;
  background: linear-gradient(135deg, rgba(29, 78, 216, 0.22), rgba(249, 115, 22, 0.16));
  content: "";
}

.hero-media img,
.equipment-figure {
  border: 1px solid rgba(219, 228, 239, 0.9);
  border-radius: 34px;
  background: #fff;
  box-shadow: var(--shadow);
}

.two-columns {
  grid-template-columns: 0.86fr 1.14fr;
}

.intro {
  background: #fff;
}

.intro h2,
.section-head h2,
.equipment h2,
.seo h2,
.tongda h2,
.final-cta h2 {
  font-size: clamp(32px, 4.6vw, 54px);
}

.text-block p,
.equipment p,
.seo p,
.tongda p,
.final-cta p,
.site-footer p {
  color: #475569;
  font-size: 17px;
}

.section-head {
  max-width: 780px;
  margin-bottom: 36px;
}

.section-head p:last-child {
  color: var(--muted);
  font-size: 17px;
}

.cards {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
}

.card,
.table-card,
.inline-cta,
.tongda-card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: 0 16px 40px rgba(15, 23, 42, 0.06);
}

.card {
  padding: 26px;
}

.card-number {
  display: inline-flex;
  margin-bottom: 32px;
  color: var(--orange);
  font-size: 13px;
  font-weight: 850;
}

.card h3,
.table-card h3 {
  margin: 0 0 12px;
  color: #0f172a;
  line-height: 1.25;
}

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

.inline-cta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  margin-top: 28px;
  padding: 22px;
}

.inline-cta p {
  margin: 0;
  color: #0f172a;
  font-size: 20px;
  font-weight: 750;
}

.equipment {
  background: #fff;
}

.equipment-grid {
  grid-template-columns: minmax(0, 0.75fr) minmax(420px, 1fr);
  align-items: center;
}

.equipment-figure {
  margin: 0;
  overflow: hidden;
}

.equipment-figure figcaption {
  padding: 16px 22px 22px;
  color: var(--muted);
  font-size: 14px;
}

.models {
  background: linear-gradient(180deg, #f8fbff 0%, #eef6ff 100%);
}

.table-card {
  margin-top: 24px;
  padding: 24px;
}

.table-card h3 {
  font-size: 22px;
}

.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: 20px;
}

.table-image-wrap {
  background: #fff;
}

.spec-image {
  width: 100%;
  min-width: 980px;
  max-width: none;
  height: auto;
}

table {
  width: 100%;
  min-width: 780px;
  border-collapse: collapse;
  background: #fff;
}

th,
td {
  padding: 16px 18px;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

th {
  color: #fff;
  background: #10233d;
  font-size: 14px;
  letter-spacing: 0.02em;
}

td {
  color: #334155;
}

tbody tr:nth-child(even) td {
  background: #f8fafc;
}

tbody tr:last-child td {
  border-bottom: 0;
}

.seo {
  background: #fff;
}

.seo p {
  margin: 18px 0 0;
}

.tongda a,
.site-footer a:not(.btn) {
  font-weight: 750;
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

.seo a {
  color: inherit;
  font-weight: inherit;
  text-decoration: none;
}

.seo a:hover {
  color: inherit;
}

.tongda-card {
  grid-template-columns: 0.8fr 1.2fr;
  padding: 34px;
  background:
    linear-gradient(135deg, rgba(29, 78, 216, 0.08), rgba(249, 115, 22, 0.08)),
    #fff;
}

.final-cta {
  padding-top: 30px;
}

.final-cta-card {
  padding: clamp(34px, 6vw, 70px);
  border-radius: 36px;
  color: #fff;
  background:
    radial-gradient(circle at 80% 20%, rgba(56, 189, 248, 0.35), transparent 28%),
    linear-gradient(135deg, #0f172a, #123a8c);
  box-shadow: var(--shadow);
}

.final-cta h2,
.final-cta p {
  color: #fff;
}

.final-cta p {
  max-width: 760px;
  opacity: 0.86;
}

.site-footer {
  padding: 54px 0 28px;
  color: #cbd5e1;
  background: #08111f;
}

.footer-grid {
  grid-template-columns: 1.2fr 1fr auto;
  align-items: start;
}

.footer-logo {
  color: #fff;
}

.footer-logo:hover {
  color: #fff;
}

.site-footer p {
  max-width: 480px;
  color: #94a3b8;
}

.site-footer a:not(.btn) {
  color: #bfdbfe;
}

.footer-title {
  margin: 0 0 12px;
  color: #fff;
  font-size: 18px;
}

.legal {
  margin-top: 32px;
  padding-top: 24px;
  border-top: 1px solid rgba(148, 163, 184, 0.25);
  color: #94a3b8;
  font-size: 14px;
}

@media (max-width: 980px) {
  .site-header {
    width: 100%;
    margin: 0;
    padding: 10px 14px;
    border-right: 0;
    border-left: 0;
    border-radius: 0 0 22px 22px;
  }

  .container {
    width: 100%;
    padding-right: 14px;
    padding-left: 14px;
  }

  .menu-toggle {
    display: block;
  }

  .nav {
    position: absolute;
    top: calc(100% + 10px);
    right: 0;
    left: 0;
    display: none;
    flex-direction: column;
    align-items: stretch;
    padding: 18px;
    border: 1px solid var(--line);
    border-radius: 24px;
    background: #fff;
    box-shadow: var(--shadow);
  }

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

  .nav a {
    padding: 10px 12px;
  }

  .nav .btn {
    margin-top: 4px;
  }

  .hero-grid,
  .two-columns,
  .equipment-grid,
  .tongda-card,
  .footer-grid {
    grid-template-columns: 1fr;
  }

  .hero {
    padding-top: 58px;
  }

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

@media (max-width: 640px) {
  .section {
    padding: 62px 0;
  }

  .logo span:last-child {
    display: none;
  }

  .hero-copy h1 {
    font-size: clamp(32px, 10.6vw, 42px);
  }

  .section-head,
  .intro,
  .equipment,
  .seo,
  .tongda-card,
  .final-cta-card,
  .site-footer {
    text-align: left;
  }

  .section-head,
  .text-block,
  .equipment-grid > *,
  .seo .container,
  .tongda-card,
  .final-cta-card,
  .footer-grid > * {
    margin-right: auto;
    margin-left: auto;
  }

  .cards,
  .hero-facts,
  .footer-grid {
    justify-items: center;
  }

  .card,
  .hero-facts li,
  .inline-cta,
  .table-card,
  .equipment-figure,
  .tongda-card,
  .final-cta-card,
  .footer-grid > * {
    width: 100%;
  }

  .equipment-figure {
    width: 100%;
  }

  .lead {
    font-size: 17px;
  }

  .hero-media {
    width: 100%;
    overflow: hidden;
    border-radius: 28px;
  }

  .hero-media::before {
    inset: 8% 0 -4% 0;
  }

  .hero-media img {
    width: 100%;
    border-radius: 28px;
  }

  .hero-facts,
  .cards {
    grid-template-columns: 1fr;
  }

  .hero-actions,
  .inline-cta {
    flex-direction: column;
    align-items: center;
  }

  .btn {
    width: 100%;
  }

  .table-card {
    padding: 16px;
    border-radius: 22px;
  }

  th,
  td {
    padding: 13px 14px;
  }

  .tongda-card,
  .final-cta-card {
    padding: 24px;
    border-radius: 26px;
  }
}