:root {
  --chart-ink: #12343b;
  --deep-water: #0a4f5c;
  --survey-blue: #2f80ed;
  --paper-peach: #e7a86b;
  --survey-red: #be4d3c;
  --lichen: #718b56;
  --fog: #eef7f5;
  --paper: #fbf6ea;
  --white: #ffffff;
  --shadow: rgba(18, 52, 59, 0.18);
  --split: 62%;
  --radius: 8px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--fog);
  color: var(--chart-ink);
  font-family: "Inter", ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  letter-spacing: 0;
}

body::selection {
  background: var(--paper-peach);
  color: var(--chart-ink);
}

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

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 24px;
  min-height: 72px;
  padding: 12px clamp(18px, 4vw, 56px);
  background: rgba(238, 247, 245, 0.84);
  border-bottom: 1px solid rgba(18, 52, 59, 0.12);
  backdrop-filter: blur(18px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-weight: 800;
}

.brand img {
  width: 42px;
  height: 42px;
  border-radius: 8px;
  box-shadow: 0 8px 22px rgba(18, 52, 59, 0.2);
}

.nav-links {
  justify-self: center;
  display: flex;
  align-items: center;
  gap: clamp(14px, 3vw, 32px);
  color: rgba(18, 52, 59, 0.74);
  font-size: 0.92rem;
  font-weight: 700;
}

.nav-links a,
.nav-action,
.button {
  outline-offset: 4px;
}

.nav-links a:hover,
.nav-action:hover {
  color: var(--survey-red);
}

.nav-action {
  justify-self: end;
  padding: 10px 16px;
  border: 1px solid rgba(18, 52, 59, 0.16);
  border-radius: 999px;
  background: var(--white);
  font-weight: 800;
  box-shadow: 0 10px 24px rgba(18, 52, 59, 0.1);
}

.hero {
  position: relative;
  isolation: isolate;
  display: grid;
  align-items: center;
  min-height: clamp(560px, 76svh, 720px);
  overflow: hidden;
  border-bottom: 1px solid rgba(18, 52, 59, 0.12);
}

.hero-map,
.modern-map,
.historical-map,
.hero-shade {
  position: absolute;
  inset: 0;
}

.hero-map {
  z-index: -3;
  background: #bcdfe1;
}

.modern-map {
  background:
    radial-gradient(circle at 67% 38%, rgba(47, 128, 237, 0.24) 0 3px, transparent 4px),
    radial-gradient(circle at 38% 65%, rgba(190, 77, 60, 0.3) 0 4px, transparent 5px),
    linear-gradient(28deg, transparent 0 24%, rgba(47, 128, 237, 0.2) 24% 25%, transparent 25% 100%),
    linear-gradient(146deg, transparent 0 38%, rgba(113, 139, 86, 0.42) 38% 41%, transparent 41% 100%),
    linear-gradient(92deg, transparent 0 16%, rgba(255, 255, 255, 0.52) 16% 17%, transparent 17% 100%),
    linear-gradient(0deg, rgba(255, 255, 255, 0.42) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.36) 1px, transparent 1px),
    linear-gradient(135deg, #cfe8e1 0%, #8cc2c3 46%, #4d9aa0 100%);
  background-size: auto, auto, auto, auto, auto, 84px 84px, 84px 84px, auto;
}

.historical-map {
  clip-path: polygon(var(--split) 0, 100% 0, 100% 100%, calc(var(--split) - 14%) 100%);
  background:
    linear-gradient(90deg, rgba(251, 246, 234, 0.06), rgba(190, 77, 60, 0.13)),
    url("assets/fletcher-map-tile.png") center / min(64vw, 720px) repeat;
  filter: saturate(0.95) contrast(1.06);
  opacity: 0.96;
}

.hero-shade {
  z-index: -1;
  background:
    linear-gradient(90deg, rgba(238, 247, 245, 0.95) 0%, rgba(238, 247, 245, 0.84) 35%, rgba(238, 247, 245, 0.18) 68%, rgba(18, 52, 59, 0.12) 100%),
    linear-gradient(0deg, rgba(18, 52, 59, 0.14), rgba(255, 255, 255, 0) 42%);
}

.soundings span {
  position: absolute;
  left: var(--x);
  top: var(--y);
  color: rgba(18, 52, 59, 0.42);
  font-family: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: clamp(0.7rem, 1vw, 0.92rem);
  font-weight: 600;
  text-transform: uppercase;
}

.route-line {
  position: absolute;
  left: 7%;
  top: 29%;
  width: 48%;
  height: 34%;
  border: 8px solid transparent;
  border-left-color: rgba(47, 128, 237, 0.48);
  border-bottom-color: rgba(47, 128, 237, 0.42);
  border-radius: 50% 0 0 50%;
  transform: rotate(-18deg);
}

.hero-pin {
  position: absolute;
  width: 20px;
  height: 20px;
  border: 4px solid var(--white);
  border-radius: 50% 50% 50% 0;
  background: var(--survey-red);
  box-shadow: 0 12px 20px rgba(18, 52, 59, 0.28);
  transform: rotate(-45deg);
}

.hero-pin-one {
  left: 66%;
  top: 38%;
}

.hero-pin-two {
  left: 33%;
  top: 66%;
  background: var(--lichen);
}

.split-handle {
  position: absolute;
  top: 0;
  bottom: 0;
  left: var(--split);
  width: 5px;
  background: rgba(255, 255, 255, 0.84);
  box-shadow: 0 0 0 1px rgba(18, 52, 59, 0.08), 0 0 28px rgba(255, 255, 255, 0.9);
  transform: skewX(-10deg);
}

.split-handle::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  width: 70px;
  height: 70px;
  border: 1px solid rgba(18, 52, 59, 0.12);
  border-radius: 50%;
  background:
    linear-gradient(90deg, rgba(18, 52, 59, 0.34) 0 2px, transparent 2px 12px, rgba(18, 52, 59, 0.34) 12px 14px),
    rgba(255, 255, 255, 0.82);
  box-shadow: 0 18px 40px rgba(18, 52, 59, 0.24);
  transform: translate(-50%, -50%) skewX(10deg);
  backdrop-filter: blur(12px);
}

.hero-content {
  width: min(760px, calc(100% - 36px));
  margin-left: clamp(18px, 7vw, 92px);
  padding-block: 32px;
}

.eyebrow,
.section-kicker {
  margin: 0 0 14px;
  color: var(--survey-red);
  font-family: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0;
  text-transform: uppercase;
}

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

h1,
h2 {
  font-family: "Fraunces", Georgia, serif;
  font-weight: 700;
  line-height: 0.98;
}

h1 {
  max-width: 700px;
  margin-bottom: 22px;
  font-size: clamp(4.1rem, 13vw, 9.5rem);
}

.hero-lede {
  max-width: 620px;
  margin-bottom: 28px;
  color: rgba(18, 52, 59, 0.82);
  font-size: clamp(1.08rem, 2.2vw, 1.44rem);
  line-height: 1.5;
  font-weight: 600;
}

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

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 13px 18px;
  border-radius: 999px;
  font-weight: 800;
  transition: transform 180ms ease, box-shadow 180ms ease, background 180ms ease;
}

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

.button-primary {
  background: var(--chart-ink);
  color: var(--white);
  box-shadow: 0 18px 36px rgba(18, 52, 59, 0.24);
}

.button-secondary {
  border: 1px solid rgba(18, 52, 59, 0.16);
  background: rgba(255, 255, 255, 0.72);
  color: var(--chart-ink);
  backdrop-filter: blur(14px);
}

.overlay-control {
  position: absolute;
  right: clamp(18px, 5vw, 70px);
  bottom: 34px;
  width: min(420px, calc(100% - 36px));
  padding: 16px;
  border: 1px solid rgba(255, 255, 255, 0.52);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.68);
  box-shadow: 0 18px 50px rgba(18, 52, 59, 0.16);
  backdrop-filter: blur(18px);
}

.overlay-control label {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 12px;
  font-weight: 800;
}

.overlay-control output {
  font-family: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  color: var(--survey-red);
}

.overlay-control input {
  width: 100%;
  accent-color: var(--survey-red);
}

.proof-strip {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: rgba(18, 52, 59, 0.14);
}

.proof-strip p {
  margin: 0;
  min-height: 92px;
  padding: 22px clamp(18px, 4vw, 38px);
  background: var(--paper);
  color: rgba(18, 52, 59, 0.78);
  line-height: 1.5;
}

.proof-strip strong {
  display: block;
  color: var(--chart-ink);
}

.section {
  padding: clamp(64px, 9vw, 118px) clamp(18px, 5vw, 72px);
}

.field-guide {
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.5), rgba(238, 247, 245, 0)),
    var(--fog);
}

.field-grid {
  display: grid;
  grid-template-columns: minmax(0, 0.96fr) minmax(320px, 0.72fr);
  align-items: center;
  gap: clamp(42px, 7vw, 96px);
  max-width: 1180px;
  margin: 0 auto;
}

.section-copy h2,
.section-heading h2,
.open-source h2 {
  margin-bottom: 22px;
  font-size: clamp(2.5rem, 6.5vw, 5.2rem);
}

.section-copy p,
.open-source p {
  max-width: 650px;
  color: rgba(18, 52, 59, 0.72);
  font-size: clamp(1rem, 1.5vw, 1.18rem);
  line-height: 1.75;
}

.phone-demo {
  justify-self: center;
  width: min(360px, 100%);
  padding: 12px;
  border-radius: 42px;
  background: #122c32;
  box-shadow: 0 38px 90px rgba(18, 52, 59, 0.28);
}

.phone-screen {
  position: relative;
  aspect-ratio: 9 / 18.6;
  overflow: hidden;
  border-radius: 32px;
  background: #bcdfe1;
}

.map-pane {
  position: absolute;
  inset: 0;
}

.modern-pane {
  background:
    linear-gradient(40deg, transparent 0 34%, rgba(47, 128, 237, 0.38) 34% 37%, transparent 37%),
    linear-gradient(112deg, transparent 0 58%, rgba(113, 139, 86, 0.48) 58% 62%, transparent 62%),
    linear-gradient(0deg, rgba(255, 255, 255, 0.44) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.42) 1px, transparent 1px),
    linear-gradient(145deg, #cde9e2, #73b2b9);
  background-size: auto, auto, 48px 48px, 48px 48px, auto;
}

.historical-pane {
  clip-path: polygon(42% 0, 100% 0, 100% 100%, 18% 100%);
  background: url("assets/fletcher-map-tile.png") center / 430px repeat;
  opacity: 0.78;
}

.phone-toolbar {
  position: absolute;
  top: 22px;
  right: 16px;
  display: grid;
  gap: 10px;
}

.phone-toolbar span,
.poi-marker {
  display: block;
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.78);
  border: 1px solid rgba(18, 52, 59, 0.1);
  box-shadow: 0 10px 24px rgba(18, 52, 59, 0.18);
  backdrop-filter: blur(10px);
}

.phone-toolbar span:nth-child(2) {
  background: var(--survey-blue);
}

.phone-toolbar span:nth-child(3) {
  background: rgba(255, 255, 255, 0.86);
}

.layer-sheet {
  position: absolute;
  left: 16px;
  right: 16px;
  bottom: 18px;
  padding: 14px;
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.84);
  box-shadow: 0 18px 32px rgba(18, 52, 59, 0.16);
  backdrop-filter: blur(18px);
}

.layer-sheet p {
  margin-bottom: 10px;
  font-size: 0.86rem;
  font-weight: 800;
}

.mini-slider {
  height: 7px;
  overflow: hidden;
  border-radius: 999px;
  background: rgba(18, 52, 59, 0.14);
}

.mini-slider span {
  display: block;
  width: 66%;
  height: 100%;
  background: var(--survey-red);
}

.poi-marker {
  position: absolute;
  left: var(--left);
  top: var(--top);
  width: 18px;
  height: 18px;
  border: 3px solid var(--white);
  background: var(--survey-red);
}

.marker-green {
  background: var(--lichen);
}

.features {
  background: var(--chart-ink);
  color: var(--white);
}

.section-heading {
  max-width: 960px;
  margin: 0 auto 42px;
}

.features .section-kicker {
  color: var(--paper-peach);
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1px;
  max-width: 1180px;
  margin: 0 auto;
  background: rgba(255, 255, 255, 0.18);
  border: 1px solid rgba(255, 255, 255, 0.18);
}

.feature-card {
  min-height: 260px;
  padding: 28px;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.07), rgba(255, 255, 255, 0.02)),
    var(--chart-ink);
}

.feature-mark {
  display: inline-block;
  margin-bottom: 56px;
  color: var(--paper-peach);
  font-family: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  font-weight: 700;
}

.feature-card h3 {
  margin-bottom: 12px;
  font-size: 1.2rem;
}

.feature-card p {
  color: rgba(255, 255, 255, 0.72);
  line-height: 1.6;
}

.release-status {
  background:
    linear-gradient(180deg, rgba(251, 246, 234, 0.84), rgba(238, 247, 245, 0.96)),
    var(--fog);
}

.release-status .section-heading p {
  max-width: 780px;
  margin: 16px 0 0;
  color: rgba(18, 52, 59, 0.72);
  font-size: 1.04rem;
  line-height: 1.7;
}

.release-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1px;
  max-width: 1180px;
  margin: 0 auto;
  border: 1px solid rgba(18, 52, 59, 0.13);
  background: rgba(18, 52, 59, 0.13);
}

.release-link {
  min-height: 168px;
  padding: 24px;
  background: rgba(255, 255, 255, 0.86);
}

.release-link:hover {
  background: var(--white);
}

.release-link span {
  display: block;
  margin-bottom: 36px;
  color: var(--survey-red);
  font-family: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
}

.release-link strong {
  display: block;
  max-width: 14rem;
  font-size: 1.05rem;
  line-height: 1.35;
}

.open-source {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: end;
  gap: 32px;
  background:
    linear-gradient(130deg, rgba(113, 139, 86, 0.22), rgba(47, 128, 237, 0.08) 52%, rgba(190, 77, 60, 0.16)),
    var(--paper);
}

.open-source > div {
  max-width: 880px;
}

.open-source-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 12px;
}

.site-footer {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 28px clamp(18px, 5vw, 72px);
  background: var(--chart-ink);
  color: rgba(255, 255, 255, 0.72);
}

.site-footer p {
  margin: 0;
}

.site-footer p:first-child {
  color: var(--white);
  font-weight: 800;
}

@media (max-width: 920px) {
  .site-header {
    grid-template-columns: 1fr auto;
  }

  .nav-links {
    display: none;
  }

  .hero-content {
    margin-left: clamp(18px, 5vw, 44px);
  }

  .field-grid,
  .open-source {
    grid-template-columns: 1fr;
  }

  .open-source {
    align-items: start;
  }

  .open-source-actions {
    justify-content: flex-start;
  }

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

@media (max-width: 640px) {
  .site-header {
    min-height: 64px;
    padding: 10px 16px;
  }

  .brand span {
    max-width: 118px;
    font-size: 0.92rem;
    line-height: 1.05;
  }

  .brand img {
    width: 36px;
    height: 36px;
  }

  .nav-action {
    padding: 9px 12px;
    font-size: 0.9rem;
  }

  .hero {
    min-height: clamp(550px, 78svh, 650px);
    align-items: start;
  }

  .hero-content {
    padding-top: 46px;
  }

  h1 {
    margin-bottom: 16px;
    font-size: clamp(3.6rem, 18vw, 5rem);
  }

  .hero-lede {
    max-width: 34rem;
    margin-bottom: 20px;
    font-size: 1rem;
  }

  .hero-actions {
    gap: 9px;
  }

  .button {
    min-height: 44px;
    padding: 11px 14px;
    font-size: 0.92rem;
  }

  .overlay-control {
    bottom: 18px;
    padding: 12px;
  }

  .hero-shade {
    background:
      linear-gradient(180deg, rgba(238, 247, 245, 0.96) 0%, rgba(238, 247, 245, 0.86) 42%, rgba(238, 247, 245, 0.24) 78%, rgba(18, 52, 59, 0.14) 100%),
      linear-gradient(90deg, rgba(238, 247, 245, 0.86), rgba(238, 247, 245, 0.08));
  }

  .proof-strip,
  .feature-grid,
  .release-grid {
    grid-template-columns: 1fr;
  }

  .proof-strip p {
    min-height: 74px;
    padding: 16px 18px;
  }

  .section {
    padding-block: 58px;
  }

  .phone-demo {
    width: min(300px, 100%);
    border-radius: 34px;
  }

  .phone-screen {
    border-radius: 25px;
  }

  .feature-card {
    min-height: 208px;
  }

  .release-link {
    min-height: 142px;
  }

  .feature-mark {
    margin-bottom: 34px;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
}