:root {
  color-scheme: dark;
  --bg: #0b0d0f;
  --panel: #12161a;
  --line: rgba(255, 255, 255, 0.14);
  --text: #f5f7f8;
  --muted: #a6adb4;
  --soft: #d7dde2;
  --accent: #d61f2a;
  --accent-2: #f1f3f5;
  --max: 1120px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
  line-height: 1.6;
}

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

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 88px;
  padding: 14px clamp(18px, 5vw, 56px) 14px 0;
  border-bottom: 1px solid var(--line);
  background: rgba(11, 13, 15, 0.92);
  backdrop-filter: blur(10px);
}

.brand img {
  width: clamp(126px, 13vw, 172px);
  height: auto;
}

.nav {
  display: flex;
  align-items: center;
  gap: clamp(16px, 3vw, 36px);
  color: var(--soft);
  font-size: 14px;
}

.nav a {
  padding: 8px 0;
  border-bottom: 1px solid transparent;
}

.nav a:hover,
.nav a:focus-visible {
  border-color: var(--accent);
  color: #fff;
}

.hero {
  position: relative;
  display: grid;
  min-height: calc(100svh - 88px);
  overflow: hidden;
  border-bottom: 1px solid var(--line);
  background:
    linear-gradient(115deg, rgba(214, 31, 42, 0.22), transparent 34%),
    radial-gradient(circle at 78% 28%, rgba(255, 255, 255, 0.14), transparent 28%),
    linear-gradient(180deg, #11161a 0%, #08090a 100%);
}

.hero::before {
  content: "";
  position: absolute;
  inset: auto -10% 14% 34%;
  height: 1px;
  transform: rotate(-14deg);
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.72), transparent);
}

.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.035) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: linear-gradient(180deg, transparent, #000 18%, #000 82%, transparent);
  pointer-events: none;
}

.hero-inner {
  position: relative;
  z-index: 1;
  width: min(var(--max), calc(100% - 36px));
  margin: auto;
  padding: 96px 0 150px;
}

.hero-mark {
  position: absolute;
  right: clamp(18px, 7vw, 92px);
  bottom: clamp(90px, 13vw, 150px);
  width: clamp(240px, 42vw, 560px);
  aspect-ratio: 1;
  border: 1px solid rgba(255, 255, 255, 0.1);
  opacity: 0.32;
  transform: skewX(-14deg);
}

.eyebrow,
.card-kicker {
  margin: 0 0 14px;
  color: var(--accent);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0;
  text-transform: uppercase;
}

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

h1 {
  max-width: 760px;
  margin-bottom: 22px;
  font-size: clamp(46px, 8vw, 94px);
  line-height: 1.04;
  font-weight: 900;
}

h2 {
  margin-bottom: 18px;
  font-size: clamp(28px, 4vw, 46px);
  line-height: 1.18;
}

h3 {
  margin-bottom: 10px;
  font-size: 24px;
  line-height: 1.25;
}

.hero-copy {
  max-width: 620px;
  color: var(--soft);
  font-size: clamp(17px, 2vw, 21px);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 36px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 24px;
  border: 1px solid var(--line);
  font-weight: 700;
  transition: transform 160ms ease, background 160ms ease, border-color 160ms ease;
}

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

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

.button.ghost {
  background: rgba(255, 255, 255, 0.04);
  color: var(--text);
}

.hero-specs {
  position: absolute;
  right: clamp(18px, 5vw, 56px);
  bottom: 30px;
  left: clamp(18px, 5vw, 56px);
  z-index: 1;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border-top: 1px solid var(--line);
  color: var(--soft);
  font-size: 14px;
}

.hero-specs span {
  padding: 18px 18px 0 0;
}

.section,
.feature-band,
.contact {
  width: min(var(--max), calc(100% - 36px));
  margin: 0 auto;
  padding: clamp(72px, 10vw, 120px) 0;
}

.section-head {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
  gap: 36px;
  align-items: end;
  margin-bottom: 36px;
}

.section-head h2 {
  grid-column: 2;
}

.section-head .eyebrow {
  grid-row: 1;
}

.product-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.product-card {
  min-height: 260px;
  padding: clamp(24px, 4vw, 38px);
  background: var(--panel);
}

.product-card p:not(.card-kicker),
.about-copy p,
.contact p,
.feature-list span {
  color: var(--muted);
}

.feature-band {
  display: grid;
  grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.05fr);
  gap: clamp(34px, 6vw, 72px);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.feature-list {
  display: grid;
  gap: 18px;
}

.feature-list div {
  display: grid;
  grid-template-columns: 112px 1fr;
  gap: 22px;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--line);
}

.feature-list strong {
  color: var(--text);
}

.about {
  display: grid;
  grid-template-columns: 0.82fr 1.18fr;
  gap: clamp(32px, 7vw, 88px);
  align-items: center;
}

.about-logo {
  display: grid;
  min-height: 360px;
  place-items: center;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.02);
}

.about-logo img {
  width: min(88%, 520px);
  height: auto;
}

.about-copy p {
  font-size: 17px;
}

.contact {
  border-top: 1px solid var(--line);
  text-align: center;
}

.contact p {
  max-width: 580px;
  margin: 0 auto 28px;
}

.site-footer {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  padding: 28px clamp(18px, 5vw, 56px);
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 13px;
}

@media (max-width: 760px) {
  .site-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    min-height: auto;
    padding-top: 12px;
    padding-right: 12px;
    padding-bottom: 12px;
    padding-left: 0;
  }

  .brand img {
    width: 148px;
    height: auto;
  }

  .nav {
    flex: 1;
    flex-wrap: nowrap;
    justify-content: flex-start;
    gap: 18px;
    max-width: none;
    min-width: 0;
    overflow-x: auto;
    padding-bottom: 2px;
    font-size: 13px;
    scrollbar-width: none;
  }

  .nav::-webkit-scrollbar {
    display: none;
  }

  .nav a {
    flex: 0 0 auto;
  }

  .hero {
    min-height: 660px;
  }

  .hero-inner {
    padding: 72px 0 150px;
  }

  .hero-mark {
    right: 22px;
    bottom: 146px;
    width: 260px;
  }

  .hero-specs {
    grid-template-columns: 1fr;
    gap: 8px;
  }

  .hero-specs span {
    padding: 0;
  }

  .section-head,
  .product-grid,
  .feature-band,
  .about {
    grid-template-columns: 1fr;
  }

  .section-head h2 {
    grid-column: auto;
  }

  .product-card {
    min-height: 210px;
  }

  .feature-list div {
    grid-template-columns: 1fr;
    gap: 4px;
  }

  .about-logo {
    min-height: 260px;
  }

  .about-logo img {
    width: min(92%, 420px);
  }

  .site-footer {
    flex-direction: column;
  }
}

@media (max-width: 480px) {
  .nav {
    gap: 4px 14px;
    font-size: 12px;
  }

  h1 {
    font-size: 40px;
    line-height: 1.12;
  }

  h2 {
    font-size: 30px;
  }

  .hero-copy {
    font-size: 16px;
  }

  .hero-actions {
    display: grid;
    grid-template-columns: 1fr;
  }

  .button {
    width: 100%;
  }
}