:root {
  --ink: #0d1c24;
  --navy: #0f2533;
  --slate: #284454;
  --stone: #f3f1ec;
  --warm: #c3ad8f;
  --muted: #64747c;
  --line: rgba(15, 37, 51, 0.14);
  --white: #ffffff;
  --shadow: 0 24px 70px rgba(13, 28, 36, 0.14);
  --radius: 24px;
  --max: 1180px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--ink);
  background: var(--white);
  line-height: 1.6;
}

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

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

.container {
  width: min(calc(100% - 40px), var(--max));
  margin: 0 auto;
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 10px;
  background: var(--white);
  color: var(--ink);
  padding: 10px 14px;
  border-radius: 10px;
  z-index: 999;
}

.skip-link:focus {
  left: 10px;
}

.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 100;
  transition: background 180ms ease, box-shadow 180ms ease, padding 180ms ease;
  padding: 18px 0;
  color: var(--white);
}

.site-header.is-scrolled,
.site-header.nav-open {
  background: rgba(13, 28, 36, 0.96);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.18);
}

.nav-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

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

.brand-mark {
  width: 46px;
  height: 46px;
  display: grid;
  place-items: center;
  border: 1px solid rgba(255, 255, 255, 0.42);
  border-radius: 14px;
  background: linear-gradient(135deg, rgba(255,255,255,.22), rgba(255,255,255,.06));
  font-weight: 800;
  letter-spacing: -0.04em;
}

.brand-text {
  display: grid;
  line-height: 1.05;
  letter-spacing: -0.03em;
}

.brand-text strong {
  font-size: 1.08rem;
}

.brand-text span {
  font-size: 0.88rem;
  opacity: .82;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 24px;
  font-size: 0.94rem;
  font-weight: 700;
}

.site-nav a {
  opacity: .88;
}

.site-nav a:hover,
.site-nav a:focus {
  opacity: 1;
}

.nav-cta {
  padding: 11px 16px;
  border: 1px solid rgba(255, 255, 255, 0.38);
  border-radius: 999px;
}

.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  border: 1px solid rgba(255, 255, 255, 0.34);
  border-radius: 12px;
  background: transparent;
  cursor: pointer;
}

.nav-toggle span {
  display: block;
  height: 2px;
  width: 20px;
  background: var(--white);
  margin: 5px auto;
}

.hero {
  position: relative;
  min-height: 780px;
  display: grid;
  align-items: center;
  color: var(--white);
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background-image: url("images/hero-stonebridge-network.jpg");
  background-size: cover;
  background-position: center;
  transform: scale(1.02);
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(90deg, rgba(9, 22, 30, .91) 0%, rgba(9, 22, 30, .72) 42%, rgba(9, 22, 30, .26) 100%),
    linear-gradient(0deg, rgba(9, 22, 30, .22), rgba(9, 22, 30, .06));
}

.hero-content {
  position: relative;
  z-index: 1;
  padding-top: 96px;
  max-width: var(--max);
}

.eyebrow {
  margin: 0 0 14px;
  color: var(--warm);
  font-size: .78rem;
  letter-spacing: .14em;
  text-transform: uppercase;
  font-weight: 800;
}

h1,
h2,
h3 {
  margin: 0;
  line-height: 1.06;
  letter-spacing: -0.055em;
}

h1 {
  max-width: 760px;
  font-size: clamp(3rem, 7vw, 6.3rem);
}

h2 {
  font-size: clamp(2.1rem, 4vw, 4rem);
}

h3 {
  font-size: 1.28rem;
}

p {
  margin: 0;
}

.hero-copy {
  margin-top: 26px;
  max-width: 650px;
  font-size: clamp(1.08rem, 2vw, 1.35rem);
  color: rgba(255, 255, 255, 0.84);
}

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

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  min-height: 52px;
  padding: 0 22px;
  border-radius: 999px;
  font-weight: 800;
  transition: transform 160ms ease, background 160ms ease, border-color 160ms ease;
  border: 1px solid transparent;
  cursor: pointer;
}

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

.button.primary {
  color: var(--navy);
  background: var(--warm);
}

.button.secondary {
  color: var(--white);
  border-color: rgba(255, 255, 255, 0.4);
  background: rgba(255, 255, 255, 0.08);
  backdrop-filter: blur(12px);
}

.trust-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 36px;
}

.trust-row span {
  padding: 9px 13px;
  border-radius: 999px;
  color: rgba(255, 255, 255, 0.88);
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.12);
  font-size: .9rem;
  font-weight: 700;
}

.section {
  padding: 104px 0;
}

.muted {
  background: var(--stone);
}

.two-column,
.grid-2 {
  display: grid;
  grid-template-columns: 1fr 1.05fr;
  gap: 70px;
}

.align-center {
  align-items: center;
}

.section-copy {
  display: grid;
  gap: 18px;
  color: var(--muted);
  font-size: 1.06rem;
}

.section p,
.card p,
.timeline-item p,
.faq-list p,
.site-footer p {
  color: var(--muted);
}

.check-list {
  list-style: none;
  padding: 0;
  margin: 28px 0 0;
  display: grid;
  gap: 12px;
}

.check-list li {
  position: relative;
  padding-left: 30px;
  font-weight: 750;
}

.check-list li::before {
  content: "✓";
  position: absolute;
  left: 0;
  top: -1px;
  color: var(--slate);
  font-weight: 900;
}

.image-card {
  margin: 0;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  border: 1px solid rgba(255,255,255,0.65);
}

.image-card img {
  width: 100%;
  height: 100%;
  min-height: 420px;
  object-fit: cover;
}

.section-heading {
  max-width: 760px;
  margin-bottom: 44px;
}

.section-heading p:not(.eyebrow) {
  margin-top: 18px;
  font-size: 1.08rem;
}

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

.card {
  padding: 28px;
  border: 1px solid var(--line);
  border-radius: 22px;
  background: var(--white);
  box-shadow: 0 10px 35px rgba(13, 28, 36, 0.06);
}

.card.highlight {
  background: var(--navy);
  color: var(--white);
}

.card.highlight p {
  color: rgba(255,255,255,.74);
}

.card-icon {
  display: inline-grid;
  place-items: center;
  width: 42px;
  height: 42px;
  margin-bottom: 22px;
  border-radius: 12px;
  color: var(--white);
  background: var(--slate);
  font-size: .78rem;
  font-weight: 900;
}

.card.highlight .card-icon {
  background: var(--warm);
  color: var(--navy);
}

.card h3 {
  margin-bottom: 12px;
}

.image-split {
  padding-top: 60px;
}

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

.timeline-item {
  padding: 26px;
  border-radius: 22px;
  background: var(--white);
  border: 1px solid rgba(15, 37, 51, 0.08);
}

.timeline-item span {
  display: inline-grid;
  place-items: center;
  width: 42px;
  height: 42px;
  margin-bottom: 22px;
  color: var(--navy);
  border-radius: 50%;
  background: var(--warm);
  font-weight: 900;
}

.timeline-item h3 {
  margin-bottom: 12px;
}

.metrics-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  margin-top: 28px;
}

.metrics-grid span {
  padding: 14px 16px;
  border-radius: 14px;
  background: var(--stone);
  font-weight: 800;
  color: var(--slate);
}

.faq-list {
  display: grid;
  gap: 12px;
}

details {
  border: 1px solid var(--line);
  border-radius: 18px;
  background: var(--white);
  overflow: hidden;
}

summary {
  padding: 22px 24px;
  cursor: pointer;
  font-weight: 850;
  list-style: none;
}

summary::-webkit-details-marker {
  display: none;
}

summary::after {
  content: "+";
  float: right;
  font-size: 1.3rem;
  color: var(--slate);
}

details[open] summary::after {
  content: "–";
}

details p {
  padding: 0 24px 24px;
}

.contact-section {
  background:
    radial-gradient(circle at top left, rgba(195,173,143,.22), transparent 35%),
    var(--navy);
  color: var(--white);
}

.contact-section p {
  color: rgba(255,255,255,.76);
}

.contact-card {
  display: grid;
  grid-template-columns: .9fr 1fr;
  gap: 50px;
  align-items: start;
}

.contact-details {
  display: grid;
  gap: 8px;
  margin-top: 26px;
  font-weight: 850;
}

.contact-details a {
  color: var(--warm);
}

.contact-form {
  display: grid;
  gap: 16px;
  padding: 30px;
  border-radius: var(--radius);
  background: var(--white);
  color: var(--ink);
  box-shadow: var(--shadow);
}

.contact-form label {
  display: grid;
  gap: 8px;
  font-weight: 800;
}

input,
select,
textarea {
  width: 100%;
  border: 1px solid rgba(15, 37, 51, 0.18);
  border-radius: 14px;
  padding: 14px 15px;
  font: inherit;
  background: #fbfaf7;
  color: var(--ink);
}

textarea {
  resize: vertical;
}

.form-note {
  color: var(--muted) !important;
  font-size: .88rem;
}

.site-footer {
  padding: 64px 0 28px;
  background: #08131a;
  color: var(--white);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.25fr .75fr 1fr;
  gap: 54px;
}

.footer-brand {
  margin-bottom: 18px;
}

.site-footer h3 {
  margin-bottom: 14px;
  font-size: 1rem;
  letter-spacing: 0;
}

.site-footer a:not(.brand) {
  display: block;
  margin: 8px 0;
  color: rgba(255,255,255,.78);
}

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,.12);
  margin-top: 48px;
  padding-top: 22px;
}

@media (max-width: 920px) {
  .nav-toggle {
    display: block;
  }

  .site-nav {
    position: absolute;
    left: 20px;
    right: 20px;
    top: 76px;
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 16px;
    border-radius: 18px;
    background: rgba(13, 28, 36, 0.98);
  }

  .site-nav.is-open {
    display: flex;
  }

  .site-nav a {
    padding: 13px 12px;
  }

  .nav-cta {
    text-align: center;
    margin-top: 8px;
  }

  .hero {
    min-height: 720px;
  }

  .hero-overlay {
    background: linear-gradient(90deg, rgba(9, 22, 30, .93), rgba(9, 22, 30, .58));
  }

  .two-column,
  .grid-2,
  .contact-card,
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 34px;
  }

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

@media (max-width: 640px) {
  .container {
    width: min(calc(100% - 28px), var(--max));
  }

  .hero {
    min-height: 680px;
  }

  .hero-content {
    padding-top: 92px;
  }

  h1 {
    font-size: clamp(2.65rem, 12vw, 4.3rem);
  }

  .section {
    padding: 74px 0;
  }

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

  .image-card img {
    min-height: 310px;
  }

  .contact-form {
    padding: 22px;
  }
}