:root {
  --ink: #172027;
  --muted: #5f6f7a;
  --line: #dbe3e8;
  --paper: #f7f9f8;
  --white: #ffffff;
  --blue: #0f5c78;
  --blue-dark: #0b3447;
  --green: #2f8065;
  --gold: #c99545;
  --shadow: 0 24px 80px rgba(13, 45, 58, 0.18);
}

* {
  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",
    "Microsoft YaHei", sans-serif;
  line-height: 1.6;
}

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

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 18px clamp(20px, 5vw, 72px);
  color: var(--white);
  transition:
    background 180ms ease,
    box-shadow 180ms ease,
    color 180ms ease;
}

.site-header.is-scrolled {
  color: var(--ink);
  background: rgba(255, 255, 255, 0.94);
  box-shadow: 0 12px 40px rgba(16, 38, 48, 0.1);
  backdrop-filter: blur(16px);
}

.brand,
.nav-links,
.hero-actions,
.hero-metrics,
.contact-details,
.header-actions,
.language-switch {
  display: flex;
  align-items: center;
}

.brand {
  gap: 10px;
  font-weight: 800;
  letter-spacing: 0;
  white-space: nowrap;
}

.brand-logo {
  width: 116px;
  height: 46px;
  object-fit: contain;
  filter: invert(1) brightness(1.8);
  mix-blend-mode: screen;
}

.site-header.is-scrolled .brand-logo {
  filter: none;
  mix-blend-mode: multiply;
}

.nav-links {
  gap: clamp(16px, 3vw, 34px);
  font-size: 14px;
  color: currentColor;
}

.nav-links a {
  opacity: 0.86;
}

.nav-links a:hover {
  opacity: 1;
}

.header-actions {
  gap: 12px;
}

.language-switch {
  gap: 4px;
  padding: 4px;
  border: 1px solid rgba(255, 255, 255, 0.3);
  border-radius: 7px;
  background: rgba(255, 255, 255, 0.1);
}

.site-header.is-scrolled .language-switch {
  border-color: var(--line);
  background: rgba(15, 92, 120, 0.06);
}

.lang-button {
  min-width: 38px;
  height: 32px;
  border: 0;
  border-radius: 5px;
  color: currentColor;
  background: transparent;
  font: inherit;
  font-size: 13px;
  font-weight: 800;
  cursor: pointer;
}

.lang-button.is-active {
  color: var(--white);
  background: var(--green);
}

.header-cta,
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  border: 1px solid transparent;
  border-radius: 7px;
  padding: 0 18px;
  font-weight: 750;
  cursor: pointer;
}

.header-cta {
  color: var(--white);
  background: var(--gold);
}

.site-header.is-scrolled .header-cta {
  color: var(--white);
}

.hero {
  position: relative;
  min-height: 92vh;
  display: grid;
  align-items: center;
  overflow: hidden;
  isolation: isolate;
  padding: 130px clamp(20px, 5vw, 72px) 72px;
}

.hero-image,
.hero-overlay {
  position: absolute;
  inset: 0;
  z-index: -2;
}

.hero-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.hero-overlay {
  z-index: -1;
  background:
    linear-gradient(90deg, rgba(7, 32, 44, 0.9) 0%, rgba(7, 32, 44, 0.7) 40%, rgba(7, 32, 44, 0.2) 100%),
    linear-gradient(0deg, rgba(9, 27, 34, 0.2), rgba(9, 27, 34, 0.2));
}

.hero-content {
  max-width: 690px;
  color: var(--white);
}

.lang-panel {
  display: none;
}

.lang-panel.is-active {
  display: block;
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--green);
  font-size: 12px;
  font-weight: 850;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.hero .eyebrow {
  color: #8dd5bb;
}

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

h1 {
  max-width: 12em;
  margin-bottom: 22px;
  font-size: clamp(42px, 7vw, 76px);
  line-height: 1.04;
  letter-spacing: 0;
}

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

h3 {
  margin-bottom: 10px;
  font-size: 20px;
  line-height: 1.25;
}

.hero-copy {
  max-width: 610px;
  margin-bottom: 30px;
  color: rgba(255, 255, 255, 0.86);
  font-size: 18px;
}

.hero-actions {
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 48px;
}

.button.primary {
  color: var(--white);
  background: var(--green);
}

.button.secondary {
  color: var(--white);
  border-color: rgba(255, 255, 255, 0.38);
  background: rgba(255, 255, 255, 0.12);
}

.hero-metrics {
  flex-wrap: wrap;
  gap: 14px;
}

.hero-metrics div {
  min-width: 126px;
  padding: 18px 20px;
  border: 1px solid rgba(255, 255, 255, 0.22);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(14px);
}

.hero-metrics strong {
  display: block;
  font-size: 28px;
  line-height: 1;
}

.hero-metrics span {
  color: rgba(255, 255, 255, 0.74);
  font-size: 13px;
}

.section {
  padding: 88px clamp(20px, 5vw, 72px);
}

.intro {
  display: grid;
  grid-template-columns: minmax(260px, 0.9fr) minmax(280px, 1.1fr);
  gap: 40px;
  align-items: end;
  background: var(--white);
}

.intro p:last-child {
  margin-bottom: 0;
  color: var(--muted);
  font-size: 20px;
}

.section-heading {
  max-width: 720px;
}

.services,
.advantages {
  background: var(--paper);
}

.service-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
  margin-top: 38px;
}

.service-grid article {
  min-height: 250px;
  padding: 28px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--white);
  box-shadow: 0 12px 36px rgba(27, 60, 73, 0.06);
}

.icon {
  display: inline-grid;
  width: 46px;
  height: 46px;
  place-items: center;
  margin-bottom: 28px;
  border-radius: 7px;
  color: var(--green);
  background: #e2f1eb;
  font-weight: 850;
}

.service-grid p,
.timeline p,
.feature-list p,
.contact-copy p {
  color: var(--muted);
}

.process {
  color: var(--white);
  background: var(--blue-dark);
}

.process .eyebrow {
  color: #8dd5bb;
}

.timeline {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1px;
  margin-top: 40px;
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.16);
}

.timeline div {
  min-height: 240px;
  padding: 30px;
  background: rgba(255, 255, 255, 0.06);
}

.timeline span {
  display: inline-grid;
  width: 34px;
  height: 34px;
  place-items: center;
  margin-bottom: 28px;
  border-radius: 50%;
  color: var(--blue-dark);
  background: var(--gold);
  font-weight: 850;
}

.timeline p {
  color: rgba(255, 255, 255, 0.72);
}

.advantage-layout {
  display: grid;
  grid-template-columns: minmax(280px, 1fr) minmax(280px, 0.72fr);
  gap: 36px;
  align-items: stretch;
  margin-top: 38px;
}

.feature-list {
  display: grid;
  gap: 16px;
}

.feature-list div,
.quote-panel {
  border-radius: 8px;
  background: var(--white);
}

.feature-list div {
  padding: 26px 28px;
  border: 1px solid var(--line);
}

.quote-panel {
  display: flex;
  min-height: 100%;
  flex-direction: column;
  justify-content: space-between;
  padding: 36px;
  color: var(--white);
  background: linear-gradient(150deg, var(--blue), var(--green));
  box-shadow: var(--shadow);
}

.quote-panel p {
  margin-bottom: 34px;
  font-size: clamp(26px, 3vw, 36px);
  line-height: 1.22;
}

.quote-panel span {
  color: rgba(255, 255, 255, 0.72);
}

.contact {
  display: grid;
  grid-template-columns: minmax(280px, 0.9fr) minmax(320px, 1fr);
  gap: 44px;
  padding: 92px clamp(20px, 5vw, 72px);
  background: var(--white);
}

.contact-copy {
  align-self: center;
}

.contact-copy h2 {
  margin-bottom: 18px;
}

.company-info {
  display: grid;
  gap: 14px;
  margin-top: 26px;
}

.company-info div {
  display: grid;
  gap: 4px;
  padding: 14px 16px;
  border: 1px solid var(--line);
  border-radius: 7px;
  background: #fbfcfb;
}

.company-info strong {
  color: var(--ink);
  font-size: 13px;
}

.company-info span,
.company-info a {
  color: var(--blue);
  font-weight: 750;
}

.contact-form {
  display: grid;
  gap: 16px;
  padding: 30px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fbfcfb;
  box-shadow: 0 18px 56px rgba(27, 60, 73, 0.09);
}

label {
  display: grid;
  gap: 8px;
  color: var(--ink);
  font-size: 14px;
  font-weight: 760;
}

input,
textarea {
  width: 100%;
  border: 1px solid #ccd8df;
  border-radius: 7px;
  padding: 13px 14px;
  color: var(--ink);
  background: var(--white);
  font: inherit;
}

textarea {
  resize: vertical;
}

input:focus,
textarea:focus {
  border-color: var(--green);
  outline: 3px solid rgba(47, 128, 101, 0.16);
}

.contact-form .button {
  width: fit-content;
}

.form-note {
  min-height: 24px;
  margin: 0;
  color: var(--green);
  font-size: 14px;
}

.site-footer {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  padding: 26px clamp(20px, 5vw, 72px);
  color: rgba(255, 255, 255, 0.72);
  background: #101b21;
  font-size: 14px;
}

@media (max-width: 980px) {
  .nav-links {
    display: none;
  }

  .header-actions {
    gap: 8px;
  }

  .hero {
    min-height: 860px;
  }

  .intro,
  .contact,
  .advantage-layout {
    grid-template-columns: 1fr;
  }

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

@media (max-width: 640px) {
  .site-header {
    padding: 14px 18px;
  }

  .brand {
    font-size: 15px;
  }

  .header-cta {
    display: none;
    min-height: 40px;
    padding: 0 12px;
    font-size: 13px;
  }

  .brand-logo {
    width: 104px;
    height: 42px;
  }

  .hero {
    min-height: 820px;
    padding: 112px 20px 48px;
  }

  .hero-overlay {
    background: linear-gradient(90deg, rgba(7, 32, 44, 0.92), rgba(7, 32, 44, 0.62));
  }

  .hero-copy {
    font-size: 16px;
  }

  .hero-metrics {
    align-items: stretch;
  }

  .hero-metrics div {
    flex: 1 1 140px;
  }

  .section,
  .contact {
    padding: 64px 20px;
  }

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

  .service-grid article,
  .timeline div {
    min-height: auto;
  }

  .contact-form {
    padding: 22px;
  }

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