:root {
  --ink: #172033;
  --muted: #5b6475;
  --line: #d7e1ed;
  --paper: #ffffff;
  --soft: #f5f8fc;
  --blue: #2468c9;
  --blue-dark: #163f91;
  --cyan: #51a9e6;
  --green: #2d8c6c;
  --gold: #d6a62f;
  --shadow: 0 20px 55px rgba(20, 45, 85, 0.14);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

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

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

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

svg {
  width: 20px;
  height: 20px;
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 76px;
  padding: 12px clamp(20px, 5vw, 72px);
  background: rgba(255, 255, 255, 0.88);
  border-bottom: 1px solid rgba(215, 225, 237, 0.72);
  backdrop-filter: blur(14px);
}

.brand img {
  width: 190px;
  height: 62px;
  object-fit: contain;
  object-position: left center;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 8px;
}

.site-nav a {
  min-height: 40px;
  padding: 8px 14px;
  border-radius: 6px;
  color: #33405a;
  font-weight: 700;
  font-size: 14px;
}

.site-nav a:hover {
  color: var(--blue-dark);
  background: #eef5ff;
}

.nav-toggle {
  display: none;
  width: 42px;
  height: 42px;
  padding: 10px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: #fff;
}

.nav-toggle span {
  display: block;
  height: 2px;
  margin: 5px 0;
  background: var(--ink);
}

.hero {
  min-height: min(640px, calc(100vh - 132px));
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(300px, 0.85fr);
  gap: clamp(28px, 6vw, 80px);
  align-items: center;
  padding: clamp(40px, 6vw, 72px) clamp(20px, 5vw, 72px);
  background-image: linear-gradient(90deg, rgba(255, 255, 255, 0.95), rgba(247, 251, 255, 0.82)), url("assets/hero-tech-bg.png");
  background-size: cover;
  background-position: center;
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--green);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0;
  text-transform: uppercase;
}

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

h1 {
  max-width: 850px;
  margin-bottom: 18px;
  font-size: clamp(48px, 7vw, 92px);
  line-height: 0.96;
  letter-spacing: 0;
}

h2 {
  margin-bottom: 16px;
  font-size: clamp(30px, 4vw, 48px);
  line-height: 1.12;
  letter-spacing: 0;
}

h3 {
  margin-bottom: 10px;
  font-size: 21px;
}

.hero-text {
  max-width: 690px;
  color: #3d495f;
  font-size: clamp(18px, 2vw, 22px);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 32px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  min-height: 48px;
  padding: 12px 18px;
  border-radius: 6px;
  font-weight: 800;
}

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

.button.primary:hover {
  background: var(--blue-dark);
}

.button.secondary {
  color: var(--blue-dark);
  background: #fff;
  border: 1px solid #bdd3ef;
}

.button.secondary:hover {
  background: #eef5ff;
}

.hero-panel {
  justify-self: end;
  width: min(100%, 420px);
  padding: 30px;
  background: rgba(255, 255, 255, 0.92);
  border: 1px solid rgba(183, 204, 229, 0.88);
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.hero-panel span,
.hero-panel small,
.trust-strip span,
.details-list dt,
.contact-item small {
  display: block;
  color: var(--muted);
  font-size: 13px;
  font-weight: 800;
  text-transform: uppercase;
}

.hero-panel strong {
  display: block;
  margin-top: 8px;
  color: var(--blue-dark);
  font-size: clamp(34px, 5vw, 54px);
  line-height: 1;
}

.hero-panel small {
  margin-top: 8px;
  font-size: 18px;
}

.hero-panel dl {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin: 28px 0 0;
  padding-top: 24px;
  border-top: 1px solid var(--line);
}

.hero-panel dt,
.hero-panel dd {
  margin: 0;
}

.hero-panel dd {
  font-size: 18px;
  font-weight: 900;
}

.trust-strip {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--line);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.trust-strip div {
  padding: 24px clamp(20px, 5vw, 72px);
  background: #fff;
}

.trust-strip strong {
  display: block;
  margin-top: 6px;
  font-size: 18px;
}

.section,
.certificate-section,
.contact-section {
  padding: clamp(64px, 8vw, 108px) clamp(20px, 5vw, 72px);
}

.section-heading {
  max-width: 760px;
  margin-bottom: 34px;
}

.section-heading p:not(.eyebrow) {
  color: var(--muted);
  font-size: 18px;
}

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

.service-card {
  min-height: 230px;
  padding: 28px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
}

.service-card svg {
  width: 42px;
  height: 42px;
  margin-bottom: 26px;
  color: var(--blue);
}

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

.info-band {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(300px, 520px);
  gap: clamp(30px, 6vw, 80px);
  align-items: center;
  padding: clamp(64px, 8vw, 108px) clamp(20px, 5vw, 72px);
  background: var(--soft);
}

.details-list {
  margin: 30px 0 0;
}

.details-list div {
  display: grid;
  grid-template-columns: 150px minmax(0, 1fr);
  gap: 18px;
  padding: 18px 0;
  border-top: 1px solid var(--line);
}

.details-list dt,
.details-list dd {
  margin: 0;
}

.details-list dd {
  color: #202b42;
  font-weight: 750;
}

.document-preview,
.certificate-frame {
  margin: 0;
}

.document-preview img,
.certificate-frame img {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  box-shadow: var(--shadow);
}

.certificate-section {
  background: #fff;
}

.certificate-frame {
  max-width: 720px;
}

.contact-section {
  display: grid;
  grid-template-columns: minmax(0, 0.8fr) minmax(0, 1.2fr);
  gap: clamp(28px, 6vw, 70px);
  color: #fff;
  background: linear-gradient(135deg, #12356f, #0c4f77 50%, #16664d);
}

.contact-copy p:not(.eyebrow) {
  max-width: 520px;
  color: rgba(255, 255, 255, 0.82);
  font-size: 18px;
}

.contact-section .eyebrow {
  color: #9be0c6;
}

.contact-grid {
  display: grid;
  gap: 12px;
}

.contact-item {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 14px;
  align-items: center;
  min-height: 76px;
  padding: 16px;
  border: 1px solid rgba(255, 255, 255, 0.22);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.08);
  font-style: normal;
  overflow-wrap: anywhere;
}

.contact-item:hover {
  background: rgba(255, 255, 255, 0.14);
}

.contact-item svg {
  width: 38px;
  height: 38px;
  padding: 8px;
  border-radius: 6px;
  color: #fff;
  background: rgba(255, 255, 255, 0.12);
}

.contact-item small {
  margin-bottom: 4px;
  color: rgba(255, 255, 255, 0.68);
}

.site-footer {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 12px;
  padding: 24px clamp(20px, 5vw, 72px);
  color: #536078;
  border-top: 1px solid var(--line);
}

@media (max-width: 880px) {
  .nav-toggle {
    display: block;
  }

  .site-nav {
    position: absolute;
    top: 76px;
    right: 20px;
    left: 20px;
    display: none;
    flex-direction: column;
    align-items: stretch;
    padding: 10px;
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 8px;
    box-shadow: var(--shadow);
  }

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

  .hero,
  .info-band,
  .contact-section {
    grid-template-columns: 1fr;
  }

  .hero {
    min-height: auto;
  }

  .hero-panel {
    justify-self: start;
  }

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

@media (max-width: 560px) {
  .site-header {
    min-height: 68px;
  }

  .brand img {
    width: 152px;
    height: 50px;
  }

  .site-nav {
    top: 68px;
  }

  .hero {
    padding-top: 42px;
  }

  h1 {
    font-size: 42px;
  }

  .hero-actions,
  .button {
    width: 100%;
  }

  .hero-panel {
    padding: 22px;
  }

  .hero-panel dl,
  .details-list div {
    grid-template-columns: 1fr;
    gap: 5px;
  }

  .contact-item {
    grid-template-columns: 36px minmax(0, 1fr);
  }

  .contact-item svg {
    width: 34px;
    height: 34px;
  }
}