:root {
  --black: #050505;
  --anthracite: #111112;
  --panel: #18181a;
  --line: #37373a;
  --muted: #9c9ca2;
  --off-white: #ecebea;
  --signal: #bf3d9d;
  --gutter: clamp(1.25rem, 5vw, 5rem);
  --max-width: 100rem;
}

* {
  box-sizing: border-box;
}

html {
  background: var(--black);
  color-scheme: dark;
}

body {
  margin: 0;
  min-width: 0;
  overflow-x: hidden;
  background: var(--black);
  color: var(--off-white);
  font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
  font-size: 1rem;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

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

.hero {
  position: relative;
  min-height: 100vh;
  min-height: 100svh;
  isolation: isolate;
  overflow: hidden;
  background-color: #090909;
}

.hero::before {
  content: "";
  position: absolute;
  inset: -0.75%;
  z-index: -2;
  pointer-events: none;
  background-image: url("assets/sturm-hero-background-v2.png");
  background-position: center center;
  background-size: cover;
  opacity: 1;
  transform: scale(1);
  transform-origin: center center;
  animation:
    bunker-power-on 1.35s cubic-bezier(0.22, 0.61, 0.36, 1) backwards,
    bunker-breathe 20s ease-in-out 1.35s infinite alternate;
  will-change: opacity, filter, transform;
}

.hero__shade {
  position: absolute;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(ellipse 52% 48% at 16% 10%, #000 0%, rgba(0, 0, 0, 0.96) 40%, transparent 100%),
    linear-gradient(90deg, rgba(0, 0, 0, 0.78) 0%, rgba(0, 0, 0, 0.3) 42%, rgba(0, 0, 0, 0.06) 70%),
    linear-gradient(180deg, rgba(0, 0, 0, 0.48) 0%, transparent 38%, rgba(0, 0, 0, 0.2) 72%, rgba(0, 0, 0, 0.72) 100%);
}

.hero__content {
  width: min(100%, var(--max-width));
  min-height: 100vh;
  min-height: 100svh;
  margin: 0 auto;
  padding: clamp(2rem, 5vh, 4.5rem) var(--gutter) clamp(2rem, 5vh, 4rem);
  display: grid;
  grid-template-columns: minmax(0, 2fr) minmax(6rem, 0.4fr);
  grid-template-rows: auto 1fr auto;
  gap: 2rem;
}

.hero__logo {
  grid-column: 1 / -1;
  width: clamp(16rem, 34vw, 36rem);
  height: auto;
  opacity: 1;
  animation: logo-power-on 0.9s cubic-bezier(0.22, 0.61, 0.36, 1) 0.18s backwards;
  will-change: opacity;
}

.hero__statement {
  grid-column: 1;
  grid-row: 3;
  align-self: end;
  max-width: 52rem;
}

h1 {
  margin-bottom: clamp(1.5rem, 3vw, 2.75rem);
  font-size: clamp(2rem, 4.5vw, 4.75rem);
  font-weight: 500;
  line-height: 1.04;
  letter-spacing: -0.045em;
  text-wrap: balance;
  text-shadow: 0 2px 20px rgba(0, 0, 0, 0.92);
}

.status,
.eyebrow {
  margin-bottom: 0;
  color: var(--muted);
  font-family: "Courier New", Courier, monospace;
  font-size: 0.75rem;
  font-weight: 700;
  line-height: 1.4;
  letter-spacing: 0.16em;
}

.status {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  color: var(--off-white);
  text-shadow: 0 1px 12px #000;
}

.status span {
  width: 0.5rem;
  height: 0.5rem;
  flex: 0 0 auto;
  background: var(--signal);
  box-shadow: 0 0 0 1px rgba(0, 0, 0, 0.6);
  animation: status-lamp 2.4s ease-in-out 1.35s infinite;
}

@keyframes bunker-power-on {
  from {
    opacity: 0.15;
    filter: brightness(0.35);
  }

  to {
    opacity: 1;
    filter: none;
  }
}

@keyframes logo-power-on {
  from {
    opacity: 0;
  }

  to {
    opacity: 1;
  }
}

@keyframes bunker-breathe {
  from {
    transform: scale(1);
  }

  to {
    transform: scale(1.025);
  }
}

@keyframes status-lamp {
  0%,
  100% {
    opacity: 0.45;
    box-shadow:
      0 0 0 1px rgba(0, 0, 0, 0.6),
      0 0 0.22rem rgba(191, 61, 157, 0.28);
  }

  50% {
    opacity: 1;
    box-shadow:
      0 0 0 1px rgba(0, 0, 0, 0.6),
      0 0 0.42rem rgba(191, 61, 157, 0.48);
  }
}

.introduction,
.features,
footer {
  width: min(100%, var(--max-width));
  margin: 0 auto;
  padding-inline: var(--gutter);
}

.introduction {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 0.75fr) minmax(0, 1.25fr);
  column-gap: clamp(3rem, 8vw, 10rem);
  row-gap: clamp(4rem, 8vw, 8rem);
  padding-block: clamp(5rem, 11vw, 11rem);
  background:
    linear-gradient(135deg, transparent 0 49.9%, rgba(255, 255, 255, 0.025) 50%),
    var(--anthracite);
  border-left: 1px solid var(--line);
  border-right: 1px solid var(--line);
}

.manufacturer-strip {
  position: absolute;
  top: 0;
  right: 0;
  left: 0;
  height: 5rem;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  padding-inline: var(--gutter);
  background: #000;
}

.manufacturer-mark {
  width: 4rem;
  height: auto;
}

.section-marker {
  position: absolute;
  top: 0;
  left: var(--gutter);
  width: min(12rem, 24vw);
  height: 0.3rem;
  background: var(--signal);
}

.section-heading h2,
.features__heading h2 {
  margin: 1.25rem 0 0;
  font-size: clamp(1.85rem, 3.2vw, 3.75rem);
  font-weight: 500;
  line-height: 1.08;
  letter-spacing: -0.035em;
  text-wrap: balance;
}

.introduction__copy {
  max-width: 50rem;
  color: #bdbdc1;
}

.introduction__copy p {
  margin-bottom: 1.5rem;
}

.introduction__copy .lead {
  margin-bottom: 2.5rem;
  color: var(--off-white);
  font-size: clamp(1.2rem, 1.75vw, 1.55rem);
  line-height: 1.48;
}

.introduction__copy .sample-capture {
  margin-bottom: 0.65rem;
  font-size: 1.0625rem;
}

.introduction__copy .sample-note {
  color: var(--muted);
  font-size: 1rem;
  line-height: 1.55;
}

blockquote {
  grid-column: 1 / -1;
  margin-bottom: 0;
  padding: clamp(2rem, 5vw, 4rem) 0 clamp(0.5rem, 1vw, 1rem) clamp(1.25rem, 3vw, 3rem);
  border-top: 1px solid var(--line);
  border-left: 0.3rem solid var(--signal);
}

blockquote p {
  max-width: 72rem;
  margin-bottom: 0;
  font-size: clamp(1.75rem, 4vw, 4rem);
  font-weight: 500;
  line-height: 1.12;
  letter-spacing: -0.035em;
  text-wrap: balance;
}

.features {
  padding-block: clamp(5rem, 10vw, 10rem);
  background: var(--black);
}

.features__heading {
  display: grid;
  grid-template-columns: minmax(0, 0.75fr) minmax(0, 1.25fr);
  gap: clamp(3rem, 8vw, 10rem);
  align-items: start;
  margin-bottom: clamp(3rem, 6vw, 6rem);
}

.features__heading h2 {
  margin-top: 0;
}

.feature-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.feature-list li {
  min-height: 10rem;
  display: grid;
  grid-template-columns: 3.5rem 1fr;
  gap: clamp(1rem, 2vw, 2rem);
  align-content: start;
  padding: 1.5rem 1.5rem 2.5rem 0;
  border-bottom: 1px solid var(--line);
}

.feature-list li:nth-child(odd) {
  padding-right: clamp(2rem, 5vw, 5rem);
  border-right: 1px solid var(--line);
}

.feature-list li:nth-child(even) {
  padding-left: clamp(2rem, 5vw, 5rem);
}

.feature-list span {
  color: var(--signal);
  font-family: "Courier New", Courier, monospace;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.12em;
}

.feature-list p {
  max-width: 33rem;
  margin-bottom: 0;
  font-size: clamp(1.1rem, 1.7vw, 1.5rem);
  line-height: 1.35;
}

footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 2rem;
  padding-block: 2rem;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-family: "Courier New", Courier, monospace;
  font-size: 0.75rem;
  letter-spacing: 0.08em;
}

footer p {
  margin-bottom: 0;
}

footer nav {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
}

footer a {
  color: var(--off-white);
  text-underline-offset: 0.3em;
  text-decoration-thickness: 1px;
  transition: color 160ms ease;
}

footer a:hover {
  color: var(--signal);
}

footer a:focus-visible {
  color: var(--off-white);
  outline: 2px solid var(--signal);
  outline-offset: 0.35rem;
}

@media (max-width: 48rem) {
  .hero::before {
    background-position: 60% center;
  }

  .hero__shade {
    background:
      linear-gradient(180deg, #000 0%, rgba(0, 0, 0, 0.96) 10rem, rgba(0, 0, 0, 0.44) 19rem, transparent 25rem),
      linear-gradient(180deg, rgba(0, 0, 0, 0.56) 0%, rgba(0, 0, 0, 0.08) 38%, rgba(0, 0, 0, 0.82) 100%);
  }

  .hero__content {
    grid-template-columns: 1fr auto;
    gap: 1.5rem;
  }

  .hero__logo {
    width: min(100%, 24rem);
  }

  .introduction,
  .features__heading {
    grid-template-columns: 1fr;
  }

  .introduction {
    row-gap: 3.5rem;
  }

  .manufacturer-strip {
    height: 4rem;
  }

  .manufacturer-mark {
    width: 2.75rem;
  }

  .features__heading {
    gap: 1.25rem;
  }

  .feature-list {
    grid-template-columns: 1fr;
  }

  .feature-list li {
    min-height: 0;
    padding: 1.5rem 0 2.25rem;
  }

  .feature-list li:nth-child(odd),
  .feature-list li:nth-child(even) {
    padding-inline: 0;
    border-right: 0;
  }

  footer {
    align-items: flex-start;
    flex-direction: column;
  }
}

@media (max-width: 28rem) {
  .hero__content {
    grid-template-columns: 1fr;
  }

  .hero__statement {
    grid-column: 1;
  }

  .feature-list li {
    grid-template-columns: 2.5rem 1fr;
  }
}

@media (prefers-reduced-motion: reduce) {
  .hero::before,
  .hero__logo,
  .status span {
    animation: none !important;
    opacity: 1 !important;
    transform: none !important;
  }

  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }
}