:root {
  --navy: #031d34;
  --navy-2: #072f50;
  --blue: #20aee5;
  --light-blue: #eaf7fb;
  --ink: #102233;
  --muted: #5e6d79;
  --white: #ffffff;
  --line: #d7e3e9;
  --max-width: 1180px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: Inter, Arial, sans-serif;
  color: var(--ink);
  background: var(--white);
  line-height: 1.6;
}

img {
  max-width: 100%;
}

.announcement {
  background: var(--navy);
  color: var(--white);
  text-align: center;
  padding: 8px 16px;
  font-size: 13px;
}

.site-header {
  max-width: var(--max-width);
  margin: auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 24px;
  gap: 24px;
  position: sticky;
  top: 0;
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(12px);
  z-index: 20;
  border-bottom: 1px solid rgba(215, 227, 233, 0.7);
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--navy);
  font-family: "Playfair Display", serif;
  letter-spacing: 0.12em;
  font-size: 21px;
}

.brand img {
  width: 38px;
  height: 38px;
  object-fit: contain;
  display: block;
}

.brand sub {
  font-size: 0.55em;
}

.site-header nav {
  display: flex;
  gap: 28px;
}

.site-header nav a,
.text-link {
  color: var(--ink);
  text-decoration: none;
  font-weight: 600;
}

.site-header nav a:hover,
.text-link:hover {
  color: #078ac2;
}

.button {
  display: inline-flex;
  justify-content: center;
  align-items: center;
  border: 0;
  background: linear-gradient(135deg, #0a6da0, #20aee5);
  color: var(--white);
  text-decoration: none;
  font-weight: 700;
  padding: 14px 24px;
  border-radius: 999px;
  cursor: pointer;
  box-shadow: 0 10px 25px rgba(12, 112, 159, 0.2);
  transition:
    transform 0.2s ease,
    box-shadow 0.2s ease;
}

.button:hover {
  transform: translateY(-2px);
  box-shadow: 0 14px 30px rgba(12, 112, 159, 0.28);
}

.button-small {
  padding: 10px 18px;
  font-size: 14px;
}

.button-full {
  width: 100%;
}

.hero {
  max-width: var(--max-width);
  margin: auto;
  display: grid;
  grid-template-columns: 1.03fr 0.97fr;
  align-items: center;
  min-height: 700px;
  padding: 70px 24px 80px;
  gap: 60px;
}

.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.16em;
  font-weight: 800;
  font-size: 12px;
  color: #078ac2;
  margin: 0 0 12px;
}

.hero h1,
.section h2,
.newsletter h2 {
  font-family: "Playfair Display", serif;
  color: var(--navy);
  line-height: 1.05;
  margin: 0;
}

.hero h1 {
  font-size: clamp(46px, 6vw, 78px);
  max-width: 760px;
}

.hero-text {
  font-size: 19px;
  color: var(--muted);
  max-width: 640px;
  margin: 26px 0;
}

.hero-actions {
  display: flex;
  align-items: center;
  gap: 24px;
}

.proof-row {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 30px;
}

.proof-row span {
  background: var(--light-blue);
  padding: 8px 12px;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 700;
}

.hero-media img {
  width: 100%;
  display: block;
  border-radius: 28px;
  box-shadow: 0 30px 70px rgba(3, 29, 52, 0.15);
}

.trust-strip {
  background: var(--navy);
  color: var(--white);
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
}

.trust-strip div {
  padding: 28px;
  text-align: center;
  background: rgba(255, 255, 255, 0.03);
}

.trust-strip strong,
.trust-strip span {
  display: block;
}

.trust-strip strong {
  font-size: 18px;
}

.trust-strip span {
  font-size: 13px;
  color: #b9d6e5;
}

.section {
  max-width: var(--max-width);
  margin: auto;
  padding: 100px 24px;
}

.section-heading {
  text-align: center;
  max-width: 760px;
  margin: 0 auto 50px;
}

.section h2,
.newsletter h2 {
  font-size: clamp(38px, 5vw, 58px);
}

.section-heading p:last-child {
  color: var(--muted);
}

.product-card {
  display: grid;
  grid-template-columns: 1fr 1fr;
  border: 1px solid var(--line);
  border-radius: 30px;
  overflow: hidden;
  box-shadow: 0 20px 50px rgba(3, 29, 52, 0.08);
}

.product-visual {
  background: #f4f9fb;
  padding: 38px;
}

.product-visual img {
  width: 100%;
  height: 100%;
  max-height: 560px;
  object-fit: cover;
  border-radius: 20px;
}

.product-info {
  padding: 52px;
}

.product-info h3 {
  font-size: 34px;
  line-height: 1.2;
  margin: 12px 0;
}

.rating {
  color: #f2a100;
  font-weight: 700;
}

.rating span {
  color: var(--muted);
  font-weight: 500;
}

.price {
  font-size: 29px;
  font-weight: 800;
}

.price span {
  font-size: 14px;
  font-weight: 500;
  color: var(--muted);
}

.check-list {
  list-style: none;
  padding: 0;
  margin: 26px 0;
}

.check-list li {
  padding: 9px 0 9px 30px;
  position: relative;
}

.check-list li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: #0b9bca;
  font-weight: 900;
}

.purchase-row {
  display: grid;
  gap: 8px;
  margin: 24px 0;
}

.purchase-row label {
  font-weight: 700;
}

.purchase-row select {
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--white);
}

.microcopy {
  font-size: 12px;
  color: var(--muted);
  text-align: center;
}

.dark-section {
  max-width: none;
  background: linear-gradient(
    135deg,
    var(--navy),
    var(--navy-2)
  );
  color: var(--white);
}

.dark-section > .section-heading,
.dark-section > .steps {
  max-width: var(--max-width);
  margin-left: auto;
  margin-right: auto;
}

.section-heading.light h2 {
  color: var(--white);
}

.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.steps article {
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.12);
  padding: 36px;
  border-radius: 22px;
}

.steps span {
  font-size: 48px;
  font-family: "Playfair Display", serif;
  color: #5ac8f0;
}

.steps h3 {
  font-size: 25px;
  margin: 8px 0;
}

.steps p {
  color: #c9dfe9;
}

.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.split > div:first-child p:not(.eyebrow) {
  color: var(--muted);
  font-size: 18px;
}

.science-card {
  background: var(--light-blue);
  padding: 40px;
  border-radius: 24px;
}

.science-card h3 {
  font-size: 28px;
  margin-top: 0;
}

.benefits {
  background: #f7fbfd;
  max-width: none;
}

.benefits > .section-heading,
.benefit-grid {
  max-width: var(--max-width);
  margin-left: auto;
  margin-right: auto;
}

.benefit-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
}

.benefit-grid article {
  background: var(--white);
  border: 1px solid var(--line);
  padding: 30px;
  border-radius: 20px;
}

.benefit-grid h3 {
  margin-top: 0;
}

.faq details {
  max-width: 820px;
  margin: 14px auto;
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 20px 24px;
  background: var(--white);
}

.faq summary {
  cursor: pointer;
  font-weight: 800;
}

.faq details p {
  color: var(--muted);
}

.newsletter {
  background: linear-gradient(
    135deg,
    #dff5fb,
    #f5fbfd
  );
  padding: 65px max(
    24px,
    calc((100vw - var(--max-width)) / 2)
  );
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 40px;
}

.newsletter h2 {
  font-size: 40px;
}

.newsletter form {
  display: flex;
  min-width: min(100%, 440px);
}

.newsletter input {
  flex: 1;
  padding: 15px;
  border: 1px solid var(--line);
  border-radius: 999px 0 0 999px;
}

.newsletter form .button {
  border-radius: 0 999px 999px 0;
}

footer {
  background: var(--navy);
  color: #c7dbe5;
  padding: 55px 24px;
  text-align: center;
}

.footer-brand {
  justify-content: center;
  color: var(--white);
}

.disclaimer {
  max-width: 780px;
  margin: 18px auto 0;
  font-size: 12px;
  color: #8fb0c0;
}

.toast {
  position: fixed;
  right: 22px;
  bottom: 22px;
  background: var(--navy);
  color: var(--white);
  padding: 14px 18px;
  border-radius: 12px;
  opacity: 0;
  transform: translateY(12px);
  pointer-events: none;
  transition: 0.25s;
  z-index: 100;
}

.toast.show {
  opacity: 1;
  transform: none;
}

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

  .hero,
  .product-card,
  .split {
    grid-template-columns: 1fr;
  }

  .hero {
    padding-top: 45px;
    min-height: auto;
  }

  .hero-media {
    order: -1;
  }

  .trust-strip,
  .benefit-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .steps {
    grid-template-columns: 1fr;
  }

  .newsletter {
    display: block;
  }

  .newsletter form {
    margin-top: 25px;
  }

  .product-visual img {
    max-height: none;
  }
}

@media (max-width: 560px) {
  .site-header {
    padding: 14px 16px;
  }

  .site-header .button-small {
    display: none;
  }

  .brand span {
    font-size: 17px;
  }

  .hero,
  .section {
    padding-left: 18px;
    padding-right: 18px;
  }

  .hero h1 {
    font-size: 43px;
  }

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

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

  .product-info {
    padding: 30px 24px;
  }

  .product-visual {
    padding: 18px;
  }

  .newsletter form {
    min-width: 0;
  }

  .newsletter h2 {
    font-size: 34px;
  }
}