:root {
  --ocean: #071d2d;
  --deep: #0b2f45;
  --mineral: #f4f7f3;
  --green: #8bc7b1;
  --ivory: #e8dcc4;
  --brass: #c99a4a;
  --slate: #b9cad0;
  --ink: #12303c;
  --line: rgba(7, 29, 45, 0.12);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: #f5f7f4;
  font-family: Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
  line-height: 1.55;
}

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

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: grid;
  grid-template-columns: 1fr auto auto;
  align-items: center;
  gap: 28px;
  min-height: 76px;
  padding: 12px clamp(20px, 4vw, 72px);
  background: rgba(244, 247, 243, 0.92);
  border-bottom: 1px solid rgba(7, 29, 45, 0.1);
  backdrop-filter: blur(18px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
}

.brand-mark {
  width: 42px;
  height: 42px;
  display: grid;
  place-items: center;
  color: var(--mineral);
  background: var(--ocean);
  border-radius: 8px;
  font-weight: 800;
}

.brand strong,
.brand small {
  display: block;
}

.brand strong {
  font-size: 17px;
  line-height: 1.1;
}

.brand small {
  margin-top: 3px;
  color: #5a7279;
  font-size: 12px;
}

.nav {
  display: flex;
  align-items: center;
  gap: 24px;
  color: #324d55;
  font-size: 14px;
  font-weight: 700;
}

.nav a {
  padding: 10px 0;
}

.nav-action,
.button,
.inquiry-form button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  border-radius: 8px;
  font-weight: 800;
}

.nav-action {
  padding: 0 18px;
  color: var(--mineral);
  background: var(--ocean);
}

.hero {
  position: relative;
  min-height: clamp(560px, calc(100vh - 150px), 820px);
  overflow: hidden;
  color: var(--mineral);
  background: var(--ocean);
}

.hero img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.hero-shade {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(90deg, rgba(7, 29, 45, 0.96) 0%, rgba(7, 29, 45, 0.74) 42%, rgba(7, 29, 45, 0.2) 100%),
    linear-gradient(0deg, rgba(7, 29, 45, 0.42), rgba(7, 29, 45, 0));
}

.hero-content {
  position: relative;
  z-index: 2;
  width: min(980px, 100%);
  padding: clamp(84px, 13vh, 150px) clamp(22px, 6vw, 112px) 92px;
}

.eyebrow {
  margin: 0 0 16px;
  color: var(--green);
  font-size: 13px;
  font-weight: 900;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.hero h1,
.section h2,
.contact-section h2 {
  margin: 0;
  letter-spacing: 0;
  line-height: 1.04;
}

.hero h1 {
  max-width: 900px;
  font-size: clamp(48px, 7.4vw, 108px);
}

.hero-copy {
  max-width: 710px;
  margin: 26px 0 0;
  color: #d9e5e4;
  font-size: clamp(20px, 2.2vw, 31px);
  line-height: 1.38;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 38px;
}

.button {
  padding: 0 22px;
}

.button.primary {
  color: var(--ocean);
  background: var(--mineral);
}

.button.secondary {
  color: var(--mineral);
  border: 1px solid rgba(244, 247, 243, 0.42);
}

.quick-facts {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border-bottom: 1px solid var(--line);
}

.quick-facts div {
  min-height: 170px;
  padding: 34px clamp(22px, 4vw, 56px);
  background: #f5f7f4;
}

.quick-facts span,
.formula {
  color: var(--brass);
  font-weight: 900;
  font-variant-numeric: tabular-nums;
}

.quick-facts strong {
  display: block;
  margin-top: 12px;
  font-size: 21px;
}

.quick-facts p {
  max-width: 360px;
  margin: 8px 0 0;
  color: #526b72;
}

.section {
  padding: clamp(72px, 10vw, 132px) clamp(20px, 5vw, 86px);
}

.section-heading {
  display: grid;
  grid-template-columns: minmax(260px, 0.9fr) minmax(320px, 1.1fr);
  gap: 36px;
  align-items: end;
  margin-bottom: 42px;
}

.section-heading h2,
.service-copy h2,
.about-panel h2,
.contact-section h2 {
  font-size: clamp(34px, 4.4vw, 64px);
}

.section-heading > p:last-child,
.service-copy > p,
.about-panel > p,
.contact-section p {
  margin: 0;
  color: #526b72;
  font-size: 18px;
}

.product-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 22px;
}

.product-card {
  overflow: hidden;
  background: #ffffff;
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: 0 20px 70px rgba(7, 29, 45, 0.08);
}

.product-card img {
  width: 100%;
  aspect-ratio: 1.45;
  object-fit: cover;
}

.product-card div {
  padding: 28px;
}

.product-card h3 {
  margin: 8px 0 10px;
  font-size: 28px;
  line-height: 1.12;
}

.product-card p {
  margin: 0;
  color: #526b72;
}

.product-card a {
  display: inline-block;
  margin-top: 22px;
  color: var(--deep);
  font-weight: 900;
  border-bottom: 2px solid var(--brass);
}

.service-section {
  display: grid;
  grid-template-columns: minmax(320px, 0.78fr) minmax(380px, 1.22fr);
  gap: 54px;
  align-items: center;
  background: #eaf0ec;
}

.service-copy {
  max-width: 640px;
}

.check-list {
  display: grid;
  gap: 14px;
  margin: 30px 0 0;
  padding: 0;
  list-style: none;
}

.check-list li {
  position: relative;
  padding-left: 34px;
  color: #324d55;
  font-weight: 800;
}

.check-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 16px;
  height: 16px;
  border: 4px solid var(--green);
  border-radius: 50%;
}

.service-image {
  width: 100%;
  border-radius: 8px;
  box-shadow: 0 24px 90px rgba(7, 29, 45, 0.18);
}

.about-section {
  display: grid;
  grid-template-columns: 1fr 0.9fr;
  gap: 42px;
  align-items: start;
}

.about-panel {
  max-width: 860px;
}

.about-list {
  display: grid;
  gap: 1px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--line);
}

.about-list div {
  padding: 26px;
  background: #ffffff;
}

.about-list span {
  display: block;
  color: #6d8187;
  font-size: 13px;
  font-weight: 900;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.about-list strong {
  display: block;
  margin-top: 8px;
  font-size: 20px;
  line-height: 1.3;
}

.contact-section {
  display: grid;
  grid-template-columns: minmax(300px, 0.9fr) minmax(320px, 0.72fr);
  gap: 54px;
  padding: clamp(72px, 10vw, 124px) clamp(20px, 5vw, 86px);
  color: var(--mineral);
  background: var(--ocean);
}

.contact-section p {
  max-width: 720px;
  margin-top: 20px;
  color: #d9e5e4;
}

.contact-lines {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 32px;
}

.contact-lines a,
.contact-lines span {
  padding: 12px 16px;
  color: var(--ocean);
  background: var(--mineral);
  border-radius: 8px;
  font-weight: 900;
}

.address-line {
  margin-top: 18px;
  padding: 18px 20px;
  max-width: 720px;
  color: var(--mineral);
  background: rgba(244, 247, 243, 0.08);
  border: 1px solid rgba(244, 247, 243, 0.18);
  border-radius: 8px;
}

.address-line span {
  display: block;
  color: var(--green);
  font-size: 13px;
  font-weight: 900;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.address-line strong {
  display: block;
  margin-top: 6px;
  font-size: 18px;
  line-height: 1.45;
}

.inquiry-form {
  display: grid;
  gap: 16px;
  padding: 24px;
  color: var(--mineral);
  background: rgba(244, 247, 243, 0.08);
  border: 1px solid rgba(244, 247, 243, 0.18);
  border-radius: 8px;
}

.inquiry-form label {
  display: grid;
  gap: 8px;
  font-size: 13px;
  font-weight: 900;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.inquiry-form input,
.inquiry-form select,
.inquiry-form textarea {
  width: 100%;
  min-height: 46px;
  padding: 12px 14px;
  color: var(--mineral);
  background: rgba(7, 29, 45, 0.48);
  border: 1px solid rgba(244, 247, 243, 0.2);
  border-radius: 6px;
  font: inherit;
}

.inquiry-form textarea {
  min-height: 118px;
  resize: vertical;
}

.inquiry-form button {
  width: 100%;
  min-height: 50px;
  color: var(--ocean);
  background: var(--green);
  border: 0;
  cursor: pointer;
}

.inquiry-form button:focus-visible,
.button:focus-visible,
.nav a:focus-visible,
.nav-action:focus-visible,
.contact-lines a:focus-visible {
  outline: 3px solid var(--brass);
  outline-offset: 3px;
}

.site-footer {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  padding: 24px clamp(20px, 5vw, 86px);
  color: #526b72;
  background: #f5f7f4;
  border-top: 1px solid var(--line);
}

@media (max-width: 920px) {
  .site-header {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .nav {
    flex-wrap: wrap;
    gap: 16px;
  }

  .nav-action {
    justify-self: start;
  }

  .hero-content {
    padding-top: 78px;
  }

  .quick-facts,
  .product-grid,
  .section-heading,
  .service-section,
  .about-section,
  .contact-section {
    grid-template-columns: 1fr;
  }

  .product-card img {
    aspect-ratio: 1.8;
  }

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

@media (max-width: 560px) {
  .brand small {
    display: none;
  }

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

  .button {
    width: 100%;
  }

  .quick-facts div {
    min-height: auto;
  }
}