:root {
  color-scheme: dark;
  --bg: #08090b;
  --ink: #f6f4ed;
  --muted: #b7b0a1;
  --line: rgba(246, 244, 237, 0.16);
  --panel: rgba(19, 20, 21, 0.86);
  --accent: #c9ff3d;
  --accent-ink: #121407;
  --track-red: #ff4b35;
  --trace-cyan: #5fd7ff;
  --header-h: 72px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 18px);
  background: var(--bg);
}

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

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

code,
pre {
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
}

.site-header {
  position: fixed;
  z-index: 20;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 clamp(18px, 4vw, 56px);
  color: var(--ink);
  background: linear-gradient(180deg, rgba(8, 9, 11, 0.78), rgba(8, 9, 11, 0));
}

.brand-mark {
  font-size: 1.05rem;
  font-weight: 800;
  letter-spacing: 0.08em;
}

.site-header nav {
  display: flex;
  align-items: center;
  gap: clamp(16px, 3vw, 30px);
  font-size: 0.84rem;
  color: rgba(246, 244, 237, 0.78);
}

.site-header a {
  transition:
    color 180ms ease,
    opacity 180ms ease;
}

.site-header a:hover {
  color: var(--accent);
}

.hero {
  position: relative;
  min-height: 96svh;
  overflow: hidden;
  display: grid;
  align-items: end;
  padding: calc(var(--header-h) + 36px) clamp(18px, 6vw, 88px) 88px;
  isolation: isolate;
}

.hero-media,
.hero-media img,
.hero-shade {
  position: absolute;
  inset: 0;
}

.hero-media {
  transform: translateY(calc(var(--scroll-y, 0) * 0.08px)) scale(1.04);
}

.hero-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: 58% 50%;
  filter: saturate(0.94) contrast(1.04) brightness(0.82);
}

.hero-shade {
  z-index: 1;
  background:
    linear-gradient(90deg, rgba(8, 9, 11, 0.96) 0%, rgba(8, 9, 11, 0.7) 36%, rgba(8, 9, 11, 0.16) 74%),
    linear-gradient(0deg, rgba(8, 9, 11, 0.9) 0%, rgba(8, 9, 11, 0) 42%),
    radial-gradient(circle at 72% 44%, rgba(201, 255, 61, 0.15), transparent 26%);
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 760px;
}

.eyebrow,
.section-kicker {
  margin: 0 0 18px;
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.hero h1 {
  margin: 0;
  font-size: clamp(5.5rem, 18vw, 17rem);
  line-height: 0.78;
  letter-spacing: 0;
}

.hero-line {
  max-width: 580px;
  margin: 28px 0 0;
  font-size: clamp(1.25rem, 2.5vw, 2.55rem);
  line-height: 1.05;
  color: rgba(246, 244, 237, 0.9);
}

.hero-actions,
.demo-toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  margin-top: 30px;
}

.button {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--line);
  border-radius: 4px;
  padding: 0 18px;
  font-size: 0.9rem;
  font-weight: 760;
  transition:
    transform 180ms ease,
    background 180ms ease,
    border-color 180ms ease,
    color 180ms ease;
  cursor: pointer;
}

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

.button.primary {
  border-color: var(--accent);
  background: var(--accent);
  color: var(--accent-ink);
}

.button.ghost {
  background: rgba(246, 244, 237, 0.06);
  color: var(--ink);
}

.button.quiet {
  border-color: transparent;
  background: transparent;
  color: rgba(246, 244, 237, 0.72);
}

.button.ghost:hover,
.button.quiet:hover {
  border-color: rgba(201, 255, 61, 0.6);
  color: var(--accent);
}

.scroll-cue {
  position: absolute;
  z-index: 3;
  right: clamp(18px, 5vw, 72px);
  bottom: 26px;
  display: flex;
  align-items: center;
  gap: 14px;
  color: rgba(246, 244, 237, 0.76);
  font-size: 0.78rem;
  font-weight: 720;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.scroll-cue::after {
  content: "";
  width: 56px;
  height: 1px;
  background: var(--accent);
  transform-origin: left;
  animation: scanline 1.8s ease-in-out infinite;
}

.download-section,
.demo-section,
.feature-section,
.depth-section,
.cta-section {
  scroll-margin-top: var(--header-h);
  padding: clamp(76px, 11vw, 144px) clamp(18px, 6vw, 88px);
}

.download-section {
  background: #f4f0e5;
  color: #15120e;
}

.download-section .section-kicker {
  color: #a33222;
}

.download-heading {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(220px, 0.36fr);
  gap: clamp(22px, 5vw, 72px);
  align-items: end;
  max-width: 1120px;
}

.download-heading h2 {
  margin: 0;
  font-size: clamp(2.1rem, 5.4vw, 6rem);
  line-height: 0.94;
}

.download-heading p {
  margin: 0;
  color: rgba(21, 18, 14, 0.62);
  font-weight: 720;
}

.download-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(28px, 5vw, 52px);
}

.download-section .button.ghost {
  border-color: rgba(21, 18, 14, 0.22);
  background: rgba(21, 18, 14, 0.04);
  color: #15120e;
}

.download-section .button.quiet {
  color: rgba(21, 18, 14, 0.62);
}

.download-section .button.ghost:hover,
.download-section .button.quiet:hover {
  border-color: rgba(163, 50, 34, 0.42);
  color: #a33222;
}

.demo-section {
  background:
    linear-gradient(180deg, #08090b 0%, #101113 100%),
    radial-gradient(circle at 20% 0%, rgba(95, 215, 255, 0.16), transparent 32%);
}

.demo-heading,
.feature-section > h2,
.depth-copy,
.cta-copy {
  max-width: 920px;
}

.demo-heading {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(260px, 0.8fr);
  gap: clamp(24px, 5vw, 76px);
  align-items: end;
}

.demo-heading h2,
.feature-section h2,
.depth-section h2,
.cta-section h2 {
  margin: 0;
  font-size: clamp(2rem, 5vw, 5.6rem);
  line-height: 0.95;
  letter-spacing: 0;
}

.demo-heading p,
.depth-section p {
  margin: 0;
  color: var(--muted);
  font-size: clamp(1rem, 1.4vw, 1.18rem);
  line-height: 1.55;
}

.demo-status {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  color: var(--muted);
  font-size: 0.88rem;
}

.demo-status::before {
  content: "";
  width: 8px;
  height: 8px;
  margin-right: 10px;
  border-radius: 999px;
  background: var(--trace-cyan);
  box-shadow: 0 0 18px rgba(95, 215, 255, 0.75);
}

.demo-frame-shell {
  margin-top: 28px;
  border: 1px solid rgba(246, 244, 237, 0.14);
  border-radius: 8px;
  overflow: hidden;
  background: #0f1115;
  box-shadow: 0 28px 90px rgba(0, 0, 0, 0.34);
}

.demo-frame-shell iframe {
  display: block;
  width: 100%;
  height: min(780px, 78svh);
  min-height: 520px;
  border: 0;
  background: #0f1115;
}

.feature-section {
  background: #f4f0e5;
  color: #15120e;
}

.feature-section .section-kicker {
  color: #a33222;
}

.feature-list {
  margin-top: clamp(42px, 8vw, 90px);
  border-top: 1px solid rgba(21, 18, 14, 0.18);
}

.feature-row {
  display: grid;
  grid-template-columns: 60px minmax(220px, 0.7fr) minmax(260px, 1fr);
  gap: clamp(18px, 4vw, 56px);
  align-items: baseline;
  padding: 30px 0;
  border-bottom: 1px solid rgba(21, 18, 14, 0.18);
}

.feature-row span {
  color: #a33222;
  font-size: 0.82rem;
  font-weight: 800;
}

.feature-row h3 {
  margin: 0;
  font-size: clamp(1.3rem, 2vw, 2rem);
  line-height: 1;
}

.feature-row p {
  margin: 0;
  color: rgba(21, 18, 14, 0.68);
  line-height: 1.55;
}

.depth-section {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(320px, 0.7fr);
  gap: clamp(30px, 7vw, 96px);
  align-items: center;
  min-height: 72svh;
  background:
    linear-gradient(135deg, rgba(95, 215, 255, 0.09), transparent 34%),
    #0b0d0f;
}

.depth-copy p {
  margin-top: 28px;
}

.terminal-panel {
  border: 1px solid rgba(246, 244, 237, 0.16);
  border-radius: 8px;
  background: #0e1113;
  overflow: hidden;
}

.terminal-panel::before {
  content: "";
  display: block;
  height: 38px;
  border-bottom: 1px solid rgba(246, 244, 237, 0.1);
  background:
    radial-gradient(circle at 22px 19px, var(--track-red) 0 4px, transparent 5px),
    radial-gradient(circle at 42px 19px, #f4b740 0 4px, transparent 5px),
    radial-gradient(circle at 62px 19px, var(--accent) 0 4px, transparent 5px);
}

.terminal-panel pre {
  margin: 0;
  padding: clamp(22px, 4vw, 36px);
  color: rgba(246, 244, 237, 0.9);
  font-size: clamp(0.88rem, 1.3vw, 1rem);
  line-height: 1.8;
  overflow-x: auto;
}

.cta-section {
  min-height: 56svh;
  display: grid;
  align-items: center;
  background:
    linear-gradient(90deg, rgba(8, 9, 11, 0.98), rgba(8, 9, 11, 0.75)),
    url("/assets/i3rs-app.png") center / cover;
}

.cta-copy .button {
  margin-top: 30px;
}

.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition:
    opacity 700ms ease,
    transform 700ms ease;
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

@keyframes scanline {
  0%,
  100% {
    transform: scaleX(0.5);
    opacity: 0.58;
  }
  50% {
    transform: scaleX(1);
    opacity: 1;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }

  .reveal {
    opacity: 1;
    transform: none;
  }
}

@media (max-width: 800px) {
  :root {
    --header-h: 64px;
  }

  .site-header nav {
    gap: 14px;
    font-size: 0.78rem;
  }

  .hero {
    min-height: 92svh;
    padding-bottom: 76px;
  }

  .hero-media img {
    object-position: 63% 50%;
  }

  .hero-shade {
    background:
      linear-gradient(90deg, rgba(8, 9, 11, 0.98) 0%, rgba(8, 9, 11, 0.68) 58%, rgba(8, 9, 11, 0.34) 100%),
      linear-gradient(0deg, rgba(8, 9, 11, 0.94) 0%, rgba(8, 9, 11, 0) 50%);
  }

  .hero h1 {
    font-size: clamp(4.4rem, 29vw, 8rem);
  }

  .scroll-cue {
    left: 18px;
    right: auto;
  }

  .download-heading,
  .demo-heading,
  .depth-section,
  .feature-row {
    grid-template-columns: 1fr;
  }

  .feature-row {
    gap: 12px;
  }

  .demo-frame-shell iframe {
    min-height: 520px;
    height: 72svh;
  }
}

@media (max-width: 520px) {
  .site-header {
    padding-inline: 16px;
  }

  .site-header nav a:nth-child(2) {
    display: none;
  }

  .hero-actions,
  .demo-toolbar {
    align-items: stretch;
  }

  .button {
    width: 100%;
  }

  .demo-status {
    width: 100%;
  }

  .demo-frame-shell {
    margin-inline: -18px;
    border-left: 0;
    border-right: 0;
    border-radius: 0;
  }
}