:root {
  --ink: #0f172a;
  --muted: #526077;
  --line: #dce4ef;
  --paper: #f5f8fc;
  --blue: #2563eb;
  --blue-dark: #1e40af;
  --blue-soft: #eaf2ff;
  --cyan: #0891b2;
  --amber: #d97706;
  --navy: #08152d;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: #fff;
  font-family: Inter, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  letter-spacing: 0;
}
a, button { -webkit-tap-highlight-color: transparent; }
a:focus-visible, button:focus-visible {
  outline: 3px solid rgba(37, 99, 235, .35);
  outline-offset: 3px;
}
.skip-link {
  position: fixed;
  left: 18px;
  top: -80px;
  z-index: 100;
  padding: 10px 14px;
  border-radius: 6px;
  background: #fff;
  color: var(--blue-dark);
  box-shadow: 0 8px 30px rgba(15, 23, 42, .18);
}
.skip-link:focus { top: 18px; }

.hero-bg {
  position: relative;
  min-height: min(850px, 100vh);
  overflow: hidden;
  isolation: isolate;
  background: #071226;
}
.hero-bg::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -2;
  background: url("./images/geotiff.png") 58% center / cover no-repeat;
  transform: scale(1.015);
}
.hero-bg::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background:
    linear-gradient(90deg, rgba(4, 12, 28, .97) 0%, rgba(4, 12, 28, .9) 35%, rgba(5, 18, 42, .52) 64%, rgba(5, 18, 42, .1) 100%),
    linear-gradient(0deg, rgba(4, 12, 28, .72) 0%, transparent 42%);
}
.hero-inner {
  width: min(1240px, calc(100% - 48px));
  min-height: min(850px, 100vh);
  margin: 0 auto;
  padding: 132px 0 164px;
  display: flex;
  align-items: center;
}
.hero-copy { width: min(760px, 100%); }
.hero-kicker {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 7px 10px;
  border: 1px solid rgba(147, 197, 253, .3);
  border-radius: 6px;
  color: #bfdbfe;
  background: rgba(30, 64, 175, .24);
  font-size: 13px;
  font-weight: 650;
}
.hero-kicker::before {
  content: "";
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: #60a5fa;
  box-shadow: 0 0 0 4px rgba(96, 165, 250, .14);
}
.hero-title {
  margin: 24px 0 0;
  color: #fff;
  font-size: clamp(58px, 8vw, 98px);
  font-weight: 780;
  line-height: .92;
}
.hero-title span { color: #60a5fa; }
.hero-tagline {
  max-width: 760px;
  margin: 20px 0 0;
  color: #fff;
  font-size: clamp(24px, 3.3vw, 42px);
  font-weight: 680;
  line-height: 1.16;
  text-wrap: balance;
}
.hero-lead {
  max-width: 580px;
  margin: 22px 0 0;
  color: #cbd5e1;
  font-size: 18px;
  line-height: 1.75;
}
.hero-points {
  margin-top: 25px;
  display: flex;
  flex-wrap: wrap;
  gap: 9px;
}
.hero-points span {
  padding: 7px 10px;
  border: 1px solid rgba(255, 255, 255, .16);
  border-radius: 5px;
  color: #dbeafe;
  background: rgba(5, 18, 42, .38);
  font-size: 13px;
}
.hero-actions {
  margin-top: 34px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
}
.hero-primary, .hero-secondary {
  min-height: 48px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  padding: 0 20px;
  border: 1px solid transparent;
  border-radius: 7px;
  text-decoration: none;
  font-size: 14px;
  font-weight: 650;
  transition: transform .18s ease, background .18s ease, border-color .18s ease;
}
.hero-primary {
  color: #fff;
  background: var(--blue);
  box-shadow: 0 12px 28px rgba(37, 99, 235, .32);
}
.hero-secondary {
  color: #fff;
  border-color: rgba(255, 255, 255, .28);
  background: rgba(5, 18, 42, .48);
}
.hero-primary:hover, .hero-secondary:hover { transform: translateY(-2px); }
.hero-primary:hover { background: #1d4ed8; }
.hero-secondary:hover { border-color: rgba(255, 255, 255, .5); background: rgba(5, 18, 42, .68); }
.hero-stats {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  border-top: 1px solid rgba(255, 255, 255, .14);
  background: rgba(4, 12, 28, .78);
  backdrop-filter: blur(14px);
}
.hero-stats-inner {
  width: min(1240px, calc(100% - 48px));
  margin: 0 auto;
  padding: 20px 0;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
}
.hero-stat {
  padding: 0 28px;
  border-left: 1px solid rgba(255, 255, 255, .12);
  color: #fff;
  font-size: 15px;
  font-weight: 680;
}
.hero-stat:first-child { padding-left: 0; border-left: 0; }
.hero-stat small {
  display: block;
  margin-top: 4px;
  color: #94a3b8;
  font-size: 12px;
  font-weight: 400;
}

main section { scroll-margin-top: 90px; }
.section-shell {
  width: min(1160px, calc(100% - 48px));
  margin: 0 auto;
}
.section-heading {
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: end;
  gap: 56px;
  margin-bottom: 42px;
}
.section-index {
  display: block;
  margin-bottom: 12px;
  color: var(--blue);
  font: 600 12px/1.2 ui-monospace, SFMono-Regular, Consolas, monospace;
  text-transform: uppercase;
}
.section-heading h2 {
  margin: 0;
  color: var(--ink);
  font-size: clamp(30px, 4vw, 46px);
  line-height: 1.12;
  text-wrap: balance;
}
.section-heading p {
  margin: 0;
  color: var(--muted);
  font-size: 16px;
  line-height: 1.8;
}

#features { padding: 100px 0; background: var(--paper); }
.capability-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
  background: #fff;
}
.capability {
  min-height: 238px;
  padding: 30px;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  transition: background .2s ease;
}
.capability:hover { background: #fafdff; }
.feature-icon {
  width: 40px;
  height: 40px;
  display: grid;
  place-items: center;
  margin-bottom: 28px;
  border-radius: 7px;
  color: var(--blue-dark);
  background: var(--blue-soft);
}
.capability:nth-child(3n+2) .feature-icon { color: var(--cyan); background: #e8f8fb; }
.capability:nth-child(3n) .feature-icon { color: var(--amber); background: #fff5df; }
.capability h3 { margin: 0; color: var(--ink); font-size: 18px; }
.capability p { margin: 10px 0 0; color: var(--muted); font-size: 14px; line-height: 1.75; }
.capability-code {
  display: block;
  margin-top: 18px;
  color: #64748b;
  font: 500 11px/1.4 ui-monospace, SFMono-Regular, Consolas, monospace;
}

#screenshots { padding: 100px 0; background: #fff; }
.product-stage {
  border: 1px solid var(--line);
  border-radius: 8px;
  overflow: hidden;
  background: #edf3fa;
  box-shadow: 0 24px 70px rgba(15, 23, 42, .12);
}
.stage-toolbar {
  min-height: 54px;
  padding: 0 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  border-bottom: 1px solid var(--line);
  background: #fff;
}
.stage-dots { display: flex; gap: 6px; }
.stage-dots i { width: 9px; height: 9px; border-radius: 50%; background: #cbd5e1; }
.stage-dots i:first-child { background: #60a5fa; }
.stage-label { color: #475569; font-size: 12px; font-weight: 650; }
.stage-image {
  display: block;
  width: 100%;
  aspect-ratio: 14 / 9;
  object-fit: cover;
  object-position: top left;
}
.shot-tabs {
  margin-top: 18px;
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  border: 1px solid var(--line);
  border-radius: 8px;
  overflow: hidden;
  background: #fff;
}
.shot-tab {
  min-height: 78px;
  padding: 14px 16px;
  border: 0;
  border-left: 1px solid var(--line);
  color: #64748b;
  background: #fff;
  text-align: left;
  cursor: pointer;
  transition: color .18s ease, background .18s ease;
}
.shot-tab:first-child { border-left: 0; }
.shot-tab:hover { color: var(--blue-dark); background: #f8fbff; }
.shot-tab[aria-selected="true"] { color: var(--blue-dark); background: var(--blue-soft); box-shadow: inset 0 3px 0 var(--blue); }
.shot-tab strong { display: block; color: inherit; font-size: 14px; }
.shot-tab span { display: block; margin-top: 4px; font-size: 11px; line-height: 1.4; }
.legacy-shot-grid { display: none !important; }

#download {
  padding: 100px 0;
  color: var(--ink);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: var(--paper);
}
#download .section-heading h2 { color: var(--ink); }
#download .section-heading p { color: var(--muted); }
.download-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 24px;
}
.version-line { color: #64748b; font-size: 14px; }
#latest-version { color: var(--blue-dark); }
.source-switch {
  display: inline-flex;
  padding: 4px;
  border: 1px solid var(--line);
  border-radius: 7px;
  background: #e8eef7;
}
.source-switch button {
  min-height: 34px;
  padding: 0 13px;
  border: 0;
  border-radius: 5px;
  color: #526077;
  background: transparent;
  cursor: pointer;
  font-size: 12px;
  font-weight: 650;
}
.source-switch button.is-active {
  color: var(--blue-dark);
  background: #fff;
  box-shadow: 0 1px 4px rgba(15, 23, 42, .12);
}
#download-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}
#download-grid a {
  min-height: 94px;
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 20px;
  border: 1px solid var(--line) !important;
  border-radius: 7px !important;
  color: var(--ink);
  background: #fff !important;
  text-decoration: none;
  box-shadow: 0 6px 18px rgba(15, 23, 42, .04) !important;
  transition: border-color .18s ease, background .18s ease, box-shadow .18s ease;
}
#download-grid a:hover {
  border-color: #93b4f8 !important;
  background: #fafdff !important;
  box-shadow: 0 10px 24px rgba(37, 99, 235, .08) !important;
}
#download-grid a.ring-2 {
  border-color: #93b4f8 !important;
  background: var(--blue-soft) !important;
  box-shadow: inset 0 0 0 1px rgba(37, 99, 235, .08) !important;
}
#download-grid .text-gray-900 { color: var(--ink) !important; }
#download-grid .text-gray-400 { color: #64748b !important; }
.download-links { margin-top: 30px; color: #94a3b8; font-size: 13px; }
.download-links a { color: var(--blue-dark); }

#community { padding: 100px 0; background: #fff; }
.community-layout {
  display: grid;
  grid-template-columns: .9fr 1.1fr;
  gap: 80px;
  align-items: center;
}
.community-copy h2 { margin: 0; font-size: clamp(30px, 4vw, 46px); line-height: 1.15; }
.community-copy p { margin: 20px 0 0; color: var(--muted); line-height: 1.8; }
.community-note {
  margin-top: 24px;
  padding-left: 14px;
  border-left: 3px solid var(--blue);
  color: #475569;
  font-size: 13px;
}
.qr-list { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.qr-item {
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
}
.qr-item h3 { margin: 0 0 14px; font-size: 14px; }
.qr-item img { width: 100%; aspect-ratio: 1; object-fit: contain; border-radius: 5px; }
.qr-item p { margin: 12px 0 0; color: #64748b; font-size: 11px; line-height: 1.55; }

@keyframes fade-up {
  from { opacity: 0; transform: translateY(18px); }
  to { opacity: 1; transform: translateY(0); }
}
.animate-fade-up { animation: fade-up .65s ease-out both; }

@media (max-width: 900px) {
  .hero-bg::before { background-position: 68% center; }
  .hero-bg::after { background: rgba(4, 12, 28, .76); }
  .hero-stats-inner { grid-template-columns: 1fr 1fr; }
  .hero-stat:nth-child(3) { padding-left: 0; border-left: 0; }
  .section-heading { grid-template-columns: 1fr; gap: 18px; }
  .capability-grid { grid-template-columns: 1fr 1fr; }
  .shot-tabs { grid-template-columns: 1fr 1fr; }
  .shot-tab { border-top: 1px solid var(--line); }
  .shot-tab:nth-child(-n+2) { border-top: 0; }
  #download-grid { grid-template-columns: 1fr 1fr; }
  .community-layout { grid-template-columns: 1fr; gap: 36px; }
}

@media (max-width: 640px) {
  .hero-bg { min-height: 820px; }
  .hero-inner {
    width: calc(100% - 36px);
    min-height: 820px;
    padding: 112px 0 198px;
    align-items: flex-start;
  }
  .hero-title { font-size: 60px; }
  .hero-tagline { font-size: 29px; }
  .hero-lead { font-size: 16px; }
  .hero-actions { align-items: stretch; }
  .hero-actions a { width: 100%; }
  .hero-stats-inner { width: calc(100% - 36px); gap: 15px 0; padding: 16px 0; }
  .hero-stat { padding: 0 12px; font-size: 13px; }
  .hero-stat:nth-child(odd) { padding-left: 0; border-left: 0; }
  .section-shell { width: calc(100% - 36px); }
  #features, #screenshots, #download, #community { padding: 72px 0; }
  .capability-grid { grid-template-columns: 1fr; }
  .capability { min-height: auto; padding: 24px; }
  .stage-image { aspect-ratio: 4 / 3; }
  .shot-tabs { grid-template-columns: 1fr; }
  .shot-tab { min-height: 60px; border-left: 0; border-top: 1px solid var(--line) !important; }
  .shot-tab:first-child { border-top: 0 !important; }
  .download-meta { align-items: flex-start; flex-direction: column; }
  #download-grid { grid-template-columns: 1fr; }
  .qr-list { gap: 10px; }
  .qr-item { padding: 12px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
  }
}