:root {
  --bg: #071117;
  --panel: rgba(9, 27, 35, 0.78);
  --panel-solid: #0d2029;
  --text: #eef8fb;
  --muted: #9db6bf;
  --line: rgba(164, 231, 241, 0.18);
  --cyan: #51d7e6;
  --aqua: #10b9c8;
  --green: #91d66f;
  --orange: #ffb657;
  --shadow: 0 24px 70px rgba(0, 0, 0, 0.38);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: Arial, "Microsoft YaHei", sans-serif;
  line-height: 1.6;
}

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

.site-header {
  position: fixed;
  z-index: 20;
  top: 0;
  left: 0;
  right: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 76px;
  padding: 0 clamp(20px, 5vw, 72px);
  border-bottom: 1px solid transparent;
  transition: background 0.2s ease, border-color 0.2s ease, backdrop-filter 0.2s ease;
}

.site-header.is-scrolled,
.site-header.is-open {
  border-color: var(--line);
  background: rgba(5, 15, 20, 0.88);
  backdrop-filter: blur(16px);
}

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

.brand-logo {
  width: 52px;
  height: 52px;
  display: block;
  object-fit: contain;
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.92);
  padding: 4px;
  box-shadow: 0 0 28px rgba(16, 185, 200, 0.2);
}

.brand strong {
  display: block;
  font-size: 17px;
  line-height: 1.2;
  letter-spacing: 0;
}

.brand small {
  display: block;
  color: var(--muted);
  font-size: 11px;
  letter-spacing: 0;
  text-transform: uppercase;
}

.site-nav {
  display: flex;
  gap: 28px;
  color: rgba(238, 248, 251, 0.82);
  font-size: 14px;
}

.site-nav a {
  position: relative;
  padding: 8px 0;
}

.site-nav a::after {
  position: absolute;
  left: 0;
  bottom: 0;
  width: 0;
  height: 2px;
  background: var(--cyan);
  content: "";
  transition: width 0.2s ease;
}

.site-nav a:hover::after {
  width: 100%;
}

.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.04);
  color: var(--text);
}

.nav-toggle span {
  display: block;
  width: 18px;
  height: 2px;
  margin: 5px auto;
  background: currentColor;
}

.hero {
  position: relative;
  min-height: 100vh;
  display: grid;
  align-items: center;
  padding: 118px clamp(20px, 5vw, 72px) 56px;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(90deg, rgba(4, 14, 20, 0.88) 0%, rgba(4, 14, 20, 0.6) 43%, rgba(4, 14, 20, 0.2) 100%),
    linear-gradient(180deg, rgba(4, 14, 20, 0.12) 0%, rgba(4, 14, 20, 0.92) 96%),
    url("assets/olympic-pool-hero.png") center / cover no-repeat;
  transform: scale(1.02);
}

.hero-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(81, 215, 230, 0.08) 1px, transparent 1px),
    linear-gradient(90deg, rgba(81, 215, 230, 0.06) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: linear-gradient(90deg, #000 0%, transparent 70%);
}

.hero-content {
  position: relative;
  z-index: 1;
  width: min(840px, 100%);
}

.eyebrow {
  margin: 0 0 14px;
  color: var(--cyan);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0;
  text-transform: uppercase;
}

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

h1 {
  max-width: 820px;
  margin-bottom: 22px;
  font-size: clamp(44px, 6vw, 68px);
  line-height: 1.04;
  letter-spacing: 0;
}

h1 span {
  display: block;
}

h2 {
  font-size: clamp(30px, 4vw, 48px);
  line-height: 1.16;
  letter-spacing: 0;
}

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

.hero-copy {
  max-width: 620px;
  color: rgba(238, 248, 251, 0.82);
  font-size: 18px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin: 34px 0;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 22px;
  border: 1px solid rgba(81, 215, 230, 0.42);
  border-radius: 8px;
  font-weight: 700;
  transition: transform 0.2s ease, border-color 0.2s ease, background 0.2s ease;
}

.button:hover {
  transform: translateY(-2px);
}

.button.primary {
  border-color: transparent;
  background: linear-gradient(135deg, var(--cyan), var(--aqua));
  color: #031418;
}

.button.ghost {
  background: rgba(255, 255, 255, 0.06);
  color: var(--text);
}

.hero-metrics {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 150px));
  gap: 12px;
}

.hero-metrics div {
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(5, 21, 28, 0.62);
  backdrop-filter: blur(10px);
}

.hero-metrics strong {
  display: block;
  color: var(--text);
  font-size: 25px;
  line-height: 1;
}

.hero-metrics span {
  color: var(--muted);
  font-size: 13px;
}

.section {
  padding: 92px clamp(20px, 5vw, 72px);
}

.section-heading {
  max-width: 860px;
  margin-bottom: 38px;
}

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

.intro {
  background:
    radial-gradient(circle at 88% 12%, rgba(145, 214, 111, 0.12), transparent 32%),
    #071117;
}

.solution-strip {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.03);
  overflow: hidden;
}

.solution-strip article {
  min-height: 250px;
  padding: 30px;
  border-right: 1px solid var(--line);
}

.solution-strip article:last-child {
  border-right: 0;
}

.icon {
  position: relative;
  display: block;
  width: 42px;
  height: 42px;
  margin-bottom: 24px;
  border-radius: 8px;
  background: rgba(81, 215, 230, 0.1);
}

.icon::before,
.icon::after {
  position: absolute;
  content: "";
}

.icon.equipment::before {
  left: 11px;
  top: 9px;
  width: 20px;
  height: 25px;
  border: 2px solid var(--cyan);
  border-radius: 11px 11px 6px 6px;
  background:
    linear-gradient(var(--cyan), var(--cyan)) 50% 8px / 18px 2px no-repeat,
    linear-gradient(var(--cyan), var(--cyan)) 50% 15px / 18px 2px no-repeat,
    rgba(81, 215, 230, 0.1);
}

.icon.equipment::after {
  left: 8px;
  top: 29px;
  width: 26px;
  height: 7px;
  border-radius: 0 0 8px 8px;
  background: var(--cyan);
  box-shadow:
    5px 5px 0 -2px var(--cyan),
    21px 5px 0 -2px var(--cyan);
}

.icon.chemical::before {
  left: 9px;
  top: 8px;
  width: 13px;
  height: 27px;
  border: 2px solid var(--green);
  border-radius: 5px 5px 8px 8px;
  background:
    linear-gradient(var(--green), var(--green)) 50% -1px / 8px 5px no-repeat,
    linear-gradient(180deg, transparent 48%, rgba(145, 214, 111, 0.35) 49%);
}

.icon.chemical::after {
  left: 26px;
  top: 14px;
  width: 6px;
  height: 18px;
  background: var(--green);
  border-radius: 999px 999px 999px 2px;
  transform: rotate(30deg);
  box-shadow:
    4px 15px 0 -2px var(--green),
    10px 21px 0 -2px var(--green);
}

.icon.service::before {
  left: 8px;
  top: 7px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--orange);
  box-shadow:
    4px 10px 0 1px var(--orange),
    12px 17px 0 -2px var(--orange);
}

.icon.service::after {
  left: 21px;
  top: 14px;
  width: 21px;
  height: 3px;
  background: var(--orange);
  border-radius: 999px;
  transform: rotate(-24deg);
  transform-origin: left center;
  box-shadow:
    9px 14px 0 -1px var(--orange),
    16px 15px 0 1px var(--orange);
}

.solution-strip p,
.product-card p,
.service-copy p,
.timeline p,
.contact-panel p,
.site-footer {
  color: var(--muted);
}

.products {
  background: #0b171d;
}

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

.product-card {
  min-height: 260px;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background:
    linear-gradient(180deg, rgba(81, 215, 230, 0.08), transparent),
    var(--panel-solid);
  box-shadow: var(--shadow);
}

.card-top {
  display: grid;
  gap: 18px;
}

.card-top span {
  color: rgba(81, 215, 230, 0.5);
  font-size: 13px;
  font-weight: 700;
}

.service-band {
  display: grid;
  grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
  gap: 44px;
  align-items: center;
  background:
    linear-gradient(135deg, rgba(81, 215, 230, 0.08), rgba(145, 214, 111, 0.06)),
    #071117;
}

.timeline {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.timeline div {
  min-height: 150px;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
}

.timeline span {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 54px;
  height: 30px;
  margin-bottom: 16px;
  border: 1px solid rgba(81, 215, 230, 0.36);
  border-radius: 999px;
  color: var(--cyan);
  font-weight: 700;
}

.contact {
  background: #0b171d;
}

.contact-panel {
  display: grid;
  grid-template-columns: minmax(0, 0.95fr) minmax(320px, 0.72fr);
  gap: 42px;
  align-items: start;
  padding: clamp(28px, 5vw, 54px);
  border: 1px solid var(--line);
  border-radius: 8px;
  background:
    linear-gradient(135deg, rgba(81, 215, 230, 0.1), rgba(255, 182, 87, 0.06)),
    var(--panel-solid);
}

.contact-form {
  display: grid;
  gap: 16px;
}

.contact-form label {
  display: grid;
  gap: 7px;
}

.contact-form span {
  color: rgba(238, 248, 251, 0.82);
  font-size: 14px;
}

.contact-form input,
.contact-form select,
.contact-form textarea {
  width: 100%;
  min-height: 46px;
  border: 1px solid rgba(164, 231, 241, 0.22);
  border-radius: 8px;
  background: rgba(4, 13, 18, 0.68);
  color: var(--text);
  font: inherit;
  outline: none;
  padding: 10px 12px;
}

.contact-form textarea {
  min-height: 106px;
  resize: vertical;
}

.contact-form input:focus,
.contact-form select:focus,
.contact-form textarea:focus {
  border-color: var(--cyan);
  box-shadow: 0 0 0 3px rgba(81, 215, 230, 0.12);
}

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

.site-footer {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 12px;
  padding: 28px clamp(20px, 5vw, 72px);
  border-top: 1px solid var(--line);
  background: #061015;
  font-size: 13px;
}

.site-footer p {
  margin: 0;
}

@media (max-width: 980px) {
  .solution-strip,
  .product-grid,
  .service-band,
  .contact-panel {
    grid-template-columns: 1fr;
  }

  .solution-strip article {
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .solution-strip article:last-child {
    border-bottom: 0;
  }

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

@media (max-width: 720px) {
  .site-header {
    height: 68px;
  }

  .nav-toggle {
    display: block;
  }

  .site-nav {
    position: absolute;
    top: 68px;
    left: 0;
    right: 0;
    display: none;
    grid-template-columns: 1fr;
    gap: 0;
    padding: 12px 20px 18px;
    border-bottom: 1px solid var(--line);
    background: rgba(5, 15, 20, 0.96);
  }

  .site-header.is-open .site-nav {
    display: grid;
  }

  .site-nav a {
    padding: 12px 0;
  }

  .hero {
    min-height: 92vh;
    padding-top: 110px;
  }

  .hero-bg {
    background:
      linear-gradient(180deg, rgba(4, 14, 20, 0.78), rgba(4, 14, 20, 0.95)),
      url("assets/olympic-pool-hero.png") center / cover no-repeat;
  }

  .hero-metrics,
  .product-grid,
  .timeline {
    grid-template-columns: 1fr;
  }

  h1 {
    font-size: 42px;
  }

  .section {
    padding: 72px 20px;
  }

  .contact-panel {
    padding: 24px;
  }
}

@media (max-width: 430px) {
  .brand strong {
    font-size: 15px;
  }

  .brand small {
    display: none;
  }

  .brand-logo {
    width: 46px;
    height: 46px;
  }

  h1 {
    font-size: 36px;
  }

  h2 {
    font-size: 28px;
  }

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