:root {
  --primary-teal: #0fa779;
  --dark-teal: #0a7a58;
  --light-teal: #d8f3ea;
  --ink: #10221d;
  --muted: #5f746e;
  --line: #d9e7e2;
  --paper: #ffffff;
  --soft: #f5fbf8;
  --blue: #2389cf;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  color: var(--ink);
  background: var(--paper);
}

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

a {
  color: inherit;
}

.container {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
}

header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(255, 255, 255, 0.94);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(12px);
}

nav {
  display: flex;
  align-items: center;
  justify-content: flex-start;
  gap: 24px;
  padding: 8px 0;
}

.brand {
  display: flex;
  align-items: center;
  text-decoration: none;
  width: 74px;
  flex: 0 0 auto;
}

.brand img {
  width: 100%;
  height: auto;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 18px;
  margin-left: auto;
  color: var(--muted);
  font-weight: 700;
  font-size: 0.95rem;
}

.nav-links a {
  text-decoration: none;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--dark-teal);
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 12px 18px;
  border-radius: 6px;
  border: 1px solid transparent;
  background: var(--primary-teal);
  color: #ffffff;
  text-decoration: none;
  font-weight: 800;
  line-height: 1.2;
  cursor: pointer;
}

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

.button.secondary {
  background: #ffffff;
  color: var(--dark-teal);
  border-color: var(--primary-teal);
}

.hero {
  background:
    linear-gradient(90deg, rgba(6, 71, 53, 0.9), rgba(6, 71, 53, 0.66), rgba(6, 71, 53, 0.28)),
    url("assets/di-tank-product.jpeg") center / cover no-repeat;
  color: #ffffff;
  min-height: 680px;
  display: flex;
  align-items: center;
  padding: 86px 0 64px;
}

.page-hero {
  background: var(--soft);
  padding: 72px 0 34px;
}

.hero-content,
.page-hero .section-heading {
  width: min(760px, 100%);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 18px;
  padding: 8px 12px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.16);
  border: 1px solid rgba(255, 255, 255, 0.26);
  font-weight: 800;
  font-size: 0.86rem;
}

h1 {
  margin: 0;
  font-size: clamp(2.4rem, 7vw, 5.4rem);
  line-height: 0.96;
  letter-spacing: 0;
}

.page-hero h1 {
  color: #12352b;
}

.hero p {
  margin: 24px 0 0;
  max-width: 620px;
  font-size: clamp(1.05rem, 2.5vw, 1.32rem);
  line-height: 1.65;
  color: rgba(255, 255, 255, 0.9);
}

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

.stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--line);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.stat {
  background: var(--paper);
  padding: 28px 18px;
  text-align: center;
}

.stat strong {
  display: block;
  color: var(--dark-teal);
  font-size: 1.55rem;
  margin-bottom: 6px;
}

.stat span {
  color: var(--muted);
  font-weight: 700;
}

section {
  padding: 82px 0;
}

main > section:nth-of-type(even) {
  background: var(--soft);
}

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

.section-heading p {
  color: var(--muted);
  line-height: 1.7;
  font-size: 1.08rem;
  margin: 14px 0 0;
}

h2 {
  margin: 0;
  color: #12352b;
  font-size: clamp(1.9rem, 4vw, 3rem);
  line-height: 1.08;
  letter-spacing: 0;
}

h3 {
  margin: 0 0 10px;
  color: #153d32;
  font-size: 1.25rem;
}

.split {
  display: grid;
  grid-template-columns: 1fr 0.92fr;
  gap: 44px;
  align-items: center;
}

.product-photo {
  border-radius: 8px;
  overflow: hidden;
  border: 1px solid var(--line);
  box-shadow: 0 20px 45px rgba(15, 45, 38, 0.14);
  background: #eef8f5;
}

.product-photo img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

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

.split .feature-grid {
  grid-template-columns: repeat(2, 1fr);
}

.feature {
  min-height: 210px;
  padding: 24px;
  border-radius: 8px;
  border: 1px solid var(--line);
  background: #ffffff;
}

.feature-icon {
  width: 44px;
  height: 44px;
  border-radius: 8px;
  display: grid;
  place-items: center;
  color: #ffffff;
  background: var(--primary-teal);
  font-weight: 900;
  margin-bottom: 18px;
}

.feature p,
.copy p,
.audience p {
  color: var(--muted);
  line-height: 1.68;
  margin: 0;
}

.copy p + p {
  margin-top: 16px;
}

.checks {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
  margin-top: 28px;
  padding: 0;
  list-style: none;
}

.checks li {
  padding: 14px 16px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #ffffff;
  color: #23443c;
  font-weight: 800;
}

.banner-wrap {
  border: 1px solid var(--line);
  border-radius: 8px;
  overflow: hidden;
  background: #ffffff;
}

.banner-wrap img {
  width: 100%;
  aspect-ratio: 3 / 4;
  object-fit: cover;
  object-position: center top;
}

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

.audience {
  border-top: 4px solid var(--primary-teal);
  background: #ffffff;
  padding: 24px;
  border-radius: 8px;
  box-shadow: 0 12px 26px rgba(18, 53, 43, 0.08);
}

.contact-layout {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 34px;
  align-items: start;
}

.contact-panel,
form {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #ffffff;
  padding: 28px;
}

.contact-list {
  display: grid;
  gap: 16px;
  margin-top: 22px;
}

.contact-item strong {
  display: block;
  color: #12352b;
  margin-bottom: 4px;
}

.contact-item a,
.contact-item span {
  color: var(--muted);
  text-decoration: none;
  line-height: 1.5;
}

form {
  display: grid;
  gap: 16px;
}

label {
  display: grid;
  gap: 8px;
  color: #153d32;
  font-weight: 800;
}

input,
textarea,
select {
  width: 100%;
  border: 1px solid #cbded8;
  border-radius: 6px;
  padding: 13px 14px;
  font: inherit;
  color: var(--ink);
  background: #ffffff;
}

textarea {
  min-height: 130px;
  resize: vertical;
}

.form-note {
  margin: 0;
  color: var(--muted);
  font-size: 0.92rem;
  line-height: 1.5;
}

footer {
  background: #0a2f25;
  color: #dceee9;
  padding: 34px 0;
}

footer .container {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  flex-wrap: wrap;
  align-items: center;
}

footer a {
  color: #ffffff;
  text-decoration: none;
  font-weight: 800;
}

.whatsapp-float {
  position: fixed;
  right: 22px;
  bottom: 22px;
  z-index: 40;
  width: 58px;
  height: 58px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: #16a34a;
  color: #ffffff;
  box-shadow: 0 14px 30px rgba(12, 74, 42, 0.28);
  text-decoration: none;
}

.whatsapp-float:hover {
  background: #128c3f;
}

.whatsapp-float svg {
  width: 30px;
  height: 30px;
  fill: currentColor;
}

@media (max-width: 900px) {
  .nav-links {
    display: none;
  }

  .hero {
    min-height: 620px;
  }

  .stats,
  .feature-grid,
  .audience-grid,
  .split,
  .contact-layout {
    grid-template-columns: 1fr 1fr;
  }

  .split,
  .contact-layout {
    gap: 28px;
  }
}

@media (max-width: 640px) {
  nav,
  footer .container {
    align-items: flex-start;
    flex-direction: column;
  }

  .brand {
    min-width: 0;
  }

  .whatsapp-float {
    right: 16px;
    bottom: 16px;
    width: 52px;
    height: 52px;
  }

  .hero {
    min-height: 590px;
    padding: 64px 0 44px;
    background:
      linear-gradient(180deg, rgba(6, 71, 53, 0.88), rgba(6, 71, 53, 0.76)),
      url("assets/di-tank-product.jpeg") center / cover no-repeat;
  }

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

  .stats,
  .feature-grid,
  .audience-grid,
  .split,
  .checks,
  .contact-layout {
    grid-template-columns: 1fr;
  }

  section {
    padding: 58px 0;
  }

  .feature,
  .contact-panel,
  form {
    padding: 22px;
  }
}