/* ============================================================
   OceanVast — Computer Systems Design and Integrated Systems
   Light theme: warm cream background, near-black text,
   teal-green accent (#0D9488 / #14B8A6 / #10B981)
   ============================================================ */

:root {
  --bg: #F7F5F0;
  --bg-soft: #EFEBE2;
  --bg-card: #FFFFFF;
  --ink: #1A1A1A;
  --ink-soft: #4B4B44;
  --ink-muted: #6E6E66;
  --accent: #0D9488;
  --accent-2: #14B8A6;
  --accent-3: #10B981;
  --accent-deep: #0B6B62;
  --dark-band: #0E2E2A;
  --dark-band-2: #123B36;
  --line: #E2DDD2;
  --radius: 16px;
  --radius-sm: 10px;
  --shadow: 0 20px 50px rgba(20, 40, 36, 0.10);
  --shadow-sm: 0 8px 24px rgba(20, 40, 36, 0.08);
  --nav-h: 76px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  font-size: 16px;
  line-height: 1.7;
  font-family: "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  background-color: var(--bg);
  color: var(--ink);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

a { color: inherit; text-decoration: none; }
ul { list-style: none; }
img { max-width: 100%; display: block; }

/* Scroll reveal — safe without JavaScript */
.fade-up {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.fade-up.visible {
  opacity: 1;
  transform: none;
}

/* ============================================================
   Split navigation — CTA left, links center, brand right
   ============================================================ */
.split-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--nav-h);
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 24px;
  padding: 0 32px;
  background-color: #F7F5F0EB;
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
  transition: box-shadow 0.3s ease;
}
.split-nav.scrolled {
  box-shadow: 0 6px 24px rgba(20, 40, 36, 0.08);
}

.split-nav__cta {
  justify-self: start;
  background-color: var(--accent);
  color: #FFFFFF;
  font-weight: 700;
  font-size: 0.92rem;
  padding: 11px 22px;
  border-radius: 999px;
  transition: background-color 0.25s ease, transform 0.25s ease;
}
.split-nav__cta:hover {
  background-color: var(--accent-deep);
  transform: translateY(-2px);
}

.split-nav__links {
  display: flex;
  align-items: center;
  gap: 30px;
}
.split-nav__links a {
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--ink-soft);
  position: relative;
  transition: color 0.25s ease;
}
.split-nav__links a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -6px;
  width: 0;
  height: 2px;
  background-color: var(--accent);
  transition: width 0.25s ease;
}
.split-nav__links a:hover { color: var(--accent-deep); }
.split-nav__links a:hover::after { width: 100%; }

.split-nav__brand {
  justify-self: end;
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  font-size: 1.15rem;
  letter-spacing: -0.02em;
}
.split-nav__mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--accent-2), var(--accent-deep));
  color: #FFFFFF;
  font-size: 0.82rem;
  font-weight: 800;
}

.split-nav__toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}
.split-nav__toggle span {
  width: 24px;
  height: 2px;
  background-color: var(--ink);
  transition: transform 0.3s ease, opacity 0.3s ease;
}
.split-nav__toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.split-nav__toggle.open span:nth-child(2) { opacity: 0; }
.split-nav__toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.split-nav__mobile {
  position: fixed;
  top: var(--nav-h);
  left: 0;
  right: 0;
  z-index: 99;
  display: none;
  flex-direction: column;
  gap: 4px;
  padding: 16px 24px 24px;
  background-color: var(--bg);
  border-bottom: 1px solid var(--line);
  box-shadow: var(--shadow);
}
.split-nav__mobile a {
  padding: 12px 4px;
  font-weight: 600;
  color: var(--ink-soft);
  border-bottom: 1px solid var(--line);
}
.split-nav__mobile .split-nav__mobile-cta {
  margin-top: 10px;
  text-align: center;
  background-color: var(--accent);
  color: #FFFFFF;
  border: none;
  border-radius: 999px;
}

/* ============================================================
   Hero with stat cluster
   ============================================================ */
.hero-stat-cluster {
  position: relative;
  padding: 180px 24px 140px;
  background:
    radial-gradient(ellipse 60% 50% at 50% -10%, rgba(20, 184, 166, 0.14), transparent 70%),
    radial-gradient(ellipse 40% 40% at 90% 20%, rgba(16, 185, 129, 0.10), transparent 70%),
    var(--bg);
  text-align: center;
  overflow: hidden;
}
.hero-stat-cluster::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(226,221,210,0.35) 1px, transparent 1px),
    linear-gradient(90deg, rgba(226,221,210,0.35) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(ellipse 60% 60% at 50% 40%, #000 20%, transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse 60% 60% at 50% 40%, #000 20%, transparent 75%);
  pointer-events: none;
}

.hero-stat-cluster__inner {
  position: relative;
  max-width: 860px;
  margin: 0 auto;
}
.hero-stat-cluster__eyebrow {
  display: inline-block;
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent-deep);
  background-color: #0D94881A;
  padding: 8px 18px;
  border-radius: 999px;
  margin-bottom: 26px;
}
.hero-stat-cluster__title {
  font-size: clamp(2.4rem, 5.5vw, 4.2rem);
  line-height: 1.06;
  letter-spacing: -0.03em;
  font-weight: 800;
  margin-bottom: 26px;
  color: var(--ink);
}
.hero-stat-cluster__lede {
  font-size: 1.2rem;
  color: var(--ink-soft);
  max-width: 660px;
  margin: 0 auto 38px;
}

.hero-stat-cluster__actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 30px;
  border-radius: 999px;
  font-weight: 700;
  font-size: 1rem;
  transition: transform 0.25s ease, box-shadow 0.25s ease, background-color 0.25s ease, color 0.25s ease;
}
.btn--solid {
  background-color: var(--accent);
  color: #FFFFFF;
}
.btn--solid:hover {
  background-color: var(--accent-deep);
  transform: translateY(-3px);
  box-shadow: 0 12px 26px rgba(13, 148, 136, 0.30);
}
.btn--ghost {
  background-color: transparent;
  color: var(--ink);
  border: 2px solid var(--accent);
}
.btn--ghost:hover {
  background-color: #0D948814;
  transform: translateY(-3px);
}

.hero-stat-cluster__stats {
  position: relative;
  margin: 70px auto 0;
  max-width: 1040px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}
.stat-card {
  background-color: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 30px 22px;
  box-shadow: var(--shadow-sm);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}
.stat-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow);
}
.stat-card__value {
  display: block;
  font-size: 2.6rem;
  font-weight: 800;
  color: var(--accent-deep);
  letter-spacing: -0.02em;
  line-height: 1;
  margin-bottom: 10px;
}
.stat-card__label {
  font-size: 0.95rem;
  color: var(--ink-muted);
  font-weight: 600;
}

/* ============================================================
   About split
   ============================================================ */
.about-split {
  padding: 100px 24px;
  background-color: var(--bg-soft);
}
.about-split__inner {
  max-width: 1120px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1.1fr;
  gap: 48px;
  align-items: start;
}
.eyebrow {
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent-deep);
  margin-bottom: 16px;
}
.about-split__lead h2 {
  font-size: clamp(1.9rem, 3.4vw, 2.7rem);
  line-height: 1.12;
  letter-spacing: -0.02em;
  font-weight: 800;
}
.about-split__body p {
  color: var(--ink-soft);
  margin-bottom: 18px;
  font-size: 1.05rem;
}
.about-split__points {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
  margin-top: 8px;
}
.about-split__points li {
  background-color: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  padding: 18px 20px;
  font-weight: 600;
  color: var(--ink);
}
.about-split__check {
  color: var(--accent);
  margin-right: 10px;
  font-weight: 800;
}

/* ============================================================
   Tabbed content
   ============================================================ */
.tabbed-content {
  padding: 100px 24px;
  background-color: var(--bg);
}
.tabbed-content__inner {
  max-width: 1120px;
  margin: 0 auto;
}
.tabbed-content__heading {
  max-width: 680px;
  margin-bottom: 44px;
}
.tabbed-content__heading h2,
.card-carousel__heading h2,
.method-grid__heading h2,
.engage-form__intro h2 {
  font-size: clamp(1.9rem, 3.4vw, 2.7rem);
  line-height: 1.12;
  letter-spacing: -0.02em;
  font-weight: 800;
  margin-bottom: 14px;
}
.lede {
  color: var(--ink-soft);
  font-size: 1.08rem;
}

.tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 30px;
}
.tab-btn {
  background-color: transparent;
  border: 2px solid var(--line);
  color: var(--ink-soft);
  font-weight: 700;
  font-size: 0.95rem;
  padding: 12px 22px;
  border-radius: 999px;
  cursor: pointer;
  transition: background-color 0.25s ease, color 0.25s ease, border-color 0.25s ease;
}
.tab-btn:hover {
  border-color: var(--accent);
  color: var(--accent-deep);
}
.tab-btn.is-active {
  background-color: var(--accent);
  border-color: var(--accent);
  color: #FFFFFF;
}

.tab-panels {
  background-color: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 40px;
  box-shadow: var(--shadow-sm);
  min-height: 220px;
}
.tab-panel {
  display: none;
}
.tab-panel.is-active {
  display: block;
  animation: tabIn 0.4s ease;
}
@keyframes tabIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: none; }
}
.tab-panel h3 {
  font-size: 1.5rem;
  font-weight: 800;
  margin-bottom: 14px;
  color: var(--ink);
}
.tab-panel p {
  color: var(--ink-soft);
  margin-bottom: 18px;
}
.tab-panel ul {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}
.tab-panel li {
  padding-left: 26px;
  position: relative;
  color: var(--ink);
  font-weight: 600;
}
.tab-panel li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 12px;
  height: 12px;
  border-radius: 3px;
  background-color: var(--accent-2);
}

/* ============================================================
   Card carousel
   ============================================================ */
.card-carousel {
  padding: 100px 24px;
  background-color: var(--bg-soft);
}
.card-carousel__inner {
  max-width: 1120px;
  margin: 0 auto;
}
.card-carousel__heading {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 40px;
}
.card-carousel__heading .lede {
  max-width: 520px;
}
.carousel-controls {
  display: flex;
  gap: 10px;
}
.carousel-btn {
  width: 52px;
  height: 52px;
  border-radius: 50%;
  border: 2px solid var(--line);
  background-color: var(--bg-card);
  color: var(--ink);
  font-size: 1.4rem;
  cursor: pointer;
  transition: background-color 0.25s ease, color 0.25s ease, border-color 0.25s ease, transform 0.25s ease;
}
.carousel-btn:hover {
  background-color: var(--accent);
  border-color: var(--accent);
  color: #FFFFFF;
  transform: translateY(-3px);
}

.carousel-viewport {
  overflow: hidden;
  border-radius: var(--radius);
}
.carousel-track {
  display: flex;
  gap: 24px;
  transition: transform 0.5s cubic-bezier(0.22, 1, 0.36, 1);
}
.carousel-card {
  flex: 0 0 calc(33.333% - 16px);
  background-color: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 34px 30px;
  box-shadow: var(--shadow-sm);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}
.carousel-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow);
}
.carousel-card__icon {
  width: 52px;
  height: 52px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--accent-2), var(--accent-deep));
  color: #FFFFFF;
  font-size: 1.5rem;
  margin-bottom: 20px;
}
.carousel-card h3 {
  font-size: 1.25rem;
  font-weight: 800;
  margin-bottom: 12px;
}
.carousel-card p {
  color: var(--ink-soft);
}

.carousel-dots {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin-top: 28px;
}
.carousel-dots span {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background-color: var(--line);
  cursor: pointer;
  transition: background-color 0.25s ease, width 0.25s ease;
}
.carousel-dots span.is-active {
  background-color: var(--accent);
  width: 28px;
  border-radius: 999px;
}

/* ============================================================
   Method grid
   ============================================================ */
.method-grid {
  padding: 100px 24px;
  background-color: var(--bg);
}
.method-grid__inner {
  max-width: 1120px;
  margin: 0 auto;
}
.method-grid__heading {
  max-width: 640px;
  margin-bottom: 48px;
}
.method-grid__cells {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 22px;
}
.method-cell {
  background-color: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 30px 26px;
  border-top: 4px solid var(--accent);
  box-shadow: var(--shadow-sm);
}
.method-cell__tag {
  display: inline-block;
  font-size: 0.85rem;
  font-weight: 800;
  color: var(--accent-deep);
  background-color: #0D94881A;
  padding: 4px 12px;
  border-radius: 999px;
  margin-bottom: 16px;
}
.method-cell h3 {
  font-size: 1.25rem;
  font-weight: 800;
  margin-bottom: 12px;
}
.method-cell p {
  color: var(--ink-soft);
}

/* ============================================================
   Engage / contact
   ============================================================ */
.engage-form {
  padding: 100px 24px;
  background:
    radial-gradient(ellipse 50% 50% at 100% 0%, rgba(20, 184, 166, 0.12), transparent 60%),
    var(--bg-soft);
}
.engage-form__inner {
  max-width: 1120px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 56px;
  align-items: start;
}
.engage-form__intro p {
  color: var(--ink-soft);
  margin-bottom: 18px;
  font-size: 1.05rem;
}
.engage-form__details {
  margin-top: 26px;
  display: grid;
  gap: 14px;
}
.engage-form__details p {
  margin-bottom: 0;
  color: var(--ink-soft);
}
.engage-form__details strong {
  display: block;
  color: var(--ink);
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}
.engage-form__details a {
  color: var(--accent-deep);
  font-weight: 700;
}

.engage-form__form {
  background-color: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 40px;
  box-shadow: var(--shadow);
}
.field {
  margin-bottom: 20px;
}
.field label {
  display: block;
  font-weight: 700;
  font-size: 0.95rem;
  margin-bottom: 8px;
}
.field input,
.field textarea {
  width: 100%;
  padding: 13px 16px;
  border: 2px solid var(--line);
  border-radius: var(--radius-sm);
  font-family: inherit;
  font-size: 1rem;
  color: var(--ink);
  background-color: #FFFFFF;
  transition: border-color 0.25s ease;
}
.field input:focus,
.field textarea:focus {
  outline: none;
  border-color: var(--accent);
}
.engage-form__form .btn {
  width: 100%;
  border: none;
  cursor: pointer;
}
.engage-form__status {
  margin-top: 16px;
  font-weight: 600;
  text-align: center;
  min-height: 1.4em;
  color: var(--accent-deep);
}

/* ============================================================
   Split footer (dark band + light band)
   ============================================================ */
.footer-split__dark {
  background: linear-gradient(135deg, var(--dark-band), var(--dark-band-2));
  color: #E8EAED;
  padding: 64px 24px 48px;
}
.footer-split__inner {
  max-width: 1120px;
  margin: 0 auto;
}
.footer-split__dark .footer-split__inner {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr;
  gap: 48px;
}
.footer-split__brand .footer-split__mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 46px;
  height: 46px;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--accent-2), var(--accent-deep));
  color: #FFFFFF;
  font-weight: 800;
  font-size: 0.95rem;
  margin-bottom: 18px;
}
.footer-split__brand p {
  color: #B8C4C2;
  max-width: 340px;
}
.footer-split__col h4 {
  color: #FFFFFF;
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 18px;
}
.footer-split__col a {
  display: block;
  color: #B8C4C2;
  margin-bottom: 12px;
  transition: color 0.25s ease;
}
.footer-split__col a:hover {
  color: var(--accent-2);
}
.footer-split__light {
  background-color: var(--bg);
  color: var(--ink-soft);
  padding: 24px;
}
.footer-split__light .footer-split__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
}
.footer-split__light p {
  font-size: 0.95rem;
}
.footer-split__legal {
  display: flex;
  gap: 28px;
}
.footer-split__legal a {
  color: var(--ink-soft);
  font-weight: 600;
  font-size: 0.95rem;
  transition: color 0.25s ease;
}
.footer-split__legal a:hover {
  color: var(--accent-deep);
}

/* ============================================================
   Responsive
   ============================================================ */
@media (max-width: 960px) {
  .hero-stat-cluster__stats {
    grid-template-columns: repeat(2, 1fr);
  }
  .about-split__inner {
    grid-template-columns: 1fr;
  }
  .method-grid__cells {
    grid-template-columns: repeat(2, 1fr);
  }
  .engage-form__inner {
    grid-template-columns: 1fr;
  }
  .tab-panel ul {
    grid-template-columns: 1fr;
  }
  .carousel-card {
    flex: 0 0 calc(50% - 12px);
  }
  .footer-split__dark .footer-split__inner {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 700px) {
  .split-nav {
    grid-template-columns: auto 1fr auto;
  }
  .split-nav__cta {
    display: none;
  }
  .split-nav__links {
    display: none;
  }
  .split-nav__toggle {
    display: flex;
    justify-self: end;
  }
  .split-nav__mobile.open {
    display: flex;
  }
  .hero-stat-cluster {
    padding: 140px 20px 90px;
  }
  .hero-stat-cluster__stats {
    grid-template-columns: 1fr 1fr;
    gap: 14px;
  }
  .stat-card__value {
    font-size: 2rem;
  }
  .about-split__points {
    grid-template-columns: 1fr;
  }
  .method-grid__cells {
    grid-template-columns: 1fr;
  }
  .carousel-card {
    flex: 0 0 100%;
  }
  .card-carousel__heading {
    flex-direction: column;
    align-items: flex-start;
  }
  .tab-panels {
    padding: 26px;
  }
  .engage-form__form {
    padding: 28px;
  }
  .footer-split__dark .footer-split__inner {
    grid-template-columns: 1fr;
  }
}