:root {
  color-scheme: dark;
  --bg: #05070b;
  --panel: #0d121a;
  --panel-soft: #111a27;
  --text: #f5f8ff;
  --muted: #a8b3c7;
  --line: rgba(159, 188, 255, 0.2);
  --blue: #3b8cff;
  --blue-strong: #1f74ff;
  --cyan: #7dd7ff;
  --green: #3ee48b;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-width: 320px;
  background: var(--bg);
  color: var(--text);
  font-family: Inter, "Segoe UI", Arial, sans-serif;
  letter-spacing: 0;
}

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

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

.topbar {
  position: fixed;
  inset: 0 0 auto;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 16px clamp(18px, 4vw, 56px);
  background: linear-gradient(180deg, rgba(2, 4, 8, 0.88), rgba(2, 4, 8, 0));
}

.brand img {
  width: clamp(170px, 18vw, 270px);
  height: auto;
}

.nav {
  display: flex;
  align-items: center;
  gap: 22px;
  color: rgba(245, 248, 255, 0.76);
  font-size: 14px;
}

.nav a {
  padding: 8px 0;
}

.nav a:hover {
  color: var(--text);
}

.hero {
  position: relative;
  min-height: 92svh;
  display: grid;
  align-items: end;
  overflow: hidden;
  isolation: isolate;
}

.hero-bg,
.hero-bg img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

.hero-bg img {
  object-fit: cover;
  object-position: center;
  filter: saturate(1.08) contrast(1.04);
}

.hero-shade {
  position: absolute;
  inset: 0;
  z-index: 1;
  background:
    linear-gradient(90deg, rgba(3, 5, 10, 0.96) 0%, rgba(3, 5, 10, 0.84) 34%, rgba(3, 5, 10, 0.28) 72%),
    linear-gradient(0deg, #05070b 0%, rgba(5, 7, 11, 0.12) 30%, rgba(5, 7, 11, 0.2) 100%);
}

.hero-content {
  position: relative;
  z-index: 2;
  width: min(760px, calc(100% - 36px));
  margin: 0 clamp(18px, 6vw, 96px) clamp(54px, 9vh, 112px);
}

.eyebrow,
.section-kicker {
  color: var(--cyan);
  font-size: 13px;
  font-weight: 800;
  text-transform: uppercase;
}

.eyebrow {
  margin-bottom: 18px;
}

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

h1 {
  max-width: 720px;
  margin-bottom: 18px;
  font-size: clamp(48px, 8vw, 104px);
  line-height: 0.95;
  font-weight: 900;
}

h2 {
  margin-bottom: 18px;
  font-size: clamp(30px, 4vw, 54px);
  line-height: 1.04;
}

h3 {
  margin-bottom: 10px;
  font-size: 20px;
}

.lead {
  margin-bottom: 14px;
  color: #ffffff;
  font-size: clamp(24px, 4vw, 44px);
  font-weight: 850;
}

.hero-copy {
  max-width: 620px;
  color: rgba(232, 238, 251, 0.84);
  font-size: clamp(17px, 2vw, 22px);
  line-height: 1.55;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 32px;
}

.button {
  min-height: 52px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 8px;
  padding: 0 22px;
  font-weight: 800;
  transition: transform 160ms ease, border-color 160ms ease, background 160ms ease;
}

.button:hover {
  transform: translateY(-1px);
}

.button.primary {
  border-color: rgba(75, 151, 255, 0.72);
  background: linear-gradient(180deg, #4ca0ff, #1766e6);
  color: #fff;
  box-shadow: 0 16px 44px rgba(31, 116, 255, 0.28);
}

.button.secondary {
  background: rgba(12, 18, 28, 0.78);
  color: #dfe8ff;
}

.button.full {
  width: 100%;
}

.button-icon {
  font-size: 20px;
  line-height: 1;
}

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 28px;
}

.hero-meta span {
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 8px 12px;
  background: rgba(11, 18, 28, 0.64);
  color: #c7d4eb;
  font-size: 13px;
}

.section,
.product-band,
.download {
  padding: clamp(70px, 9vw, 128px) 0;
}

.section-inner {
  width: min(1180px, calc(100% - 36px));
  margin: 0 auto;
}

.intro {
  background: linear-gradient(180deg, #05070b, #08101a);
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.intro-grid,
.product-grid,
.reliability-grid,
.download-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(320px, 0.84fr);
  gap: clamp(34px, 6vw, 84px);
  align-items: center;
}

.intro p,
.product-copy p,
.download p {
  color: var(--muted);
  font-size: 18px;
  line-height: 1.7;
}

.section-head {
  max-width: 760px;
  margin-bottom: 34px;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.feature {
  min-height: 210px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 24px;
  background:
    linear-gradient(180deg, rgba(19, 31, 47, 0.94), rgba(8, 13, 21, 0.94)),
    radial-gradient(circle at 100% 0, rgba(59, 140, 255, 0.18), transparent 42%);
}

.feature-mark {
  display: inline-flex;
  margin-bottom: 28px;
  color: var(--blue);
  font-weight: 900;
}

.feature p,
.check-list {
  color: var(--muted);
  line-height: 1.62;
}

.product-band {
  border-block: 1px solid rgba(255, 255, 255, 0.08);
  background:
    linear-gradient(90deg, rgba(4, 8, 13, 0.98), rgba(10, 18, 30, 0.96)),
    url("/assets/cas-banner.jpg") center / cover fixed;
  background-blend-mode: multiply;
}

.check-list {
  margin: 24px 0 0;
  padding-left: 20px;
}

.check-list li + li {
  margin-top: 10px;
}

.interface {
  border: 1px solid rgba(125, 215, 255, 0.24);
  border-radius: 8px;
  padding: 18px;
  background: linear-gradient(180deg, #0d1623, #070b11);
  box-shadow: 0 22px 90px rgba(0, 0, 0, 0.42);
}

.interface-top {
  display: flex;
  align-items: center;
  gap: 8px;
  height: 34px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  color: #8fb5ff;
  font-size: 12px;
}

.interface-top span {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #34465f;
}

.interface-top strong {
  margin-left: auto;
  font-size: 11px;
}

.wave {
  height: 118px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin: 18px 0;
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 6px;
  padding: 18px;
  background: #060a10;
}

.wave i {
  width: 6%;
  border-radius: 99px;
  background: linear-gradient(180deg, var(--cyan), var(--blue));
}

.mixer {
  height: 150px;
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 12px;
  align-items: end;
  margin-bottom: 14px;
}

.mixer span {
  display: block;
  border-radius: 6px 6px 2px 2px;
  background: linear-gradient(180deg, var(--green), var(--blue-strong));
  box-shadow: 0 0 24px rgba(62, 228, 139, 0.16);
}

.pad-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 8px;
}

.pad-grid button {
  height: 42px;
  border: 1px solid rgba(125, 215, 255, 0.24);
  border-radius: 6px;
  background: #121b29;
  color: #d7e4ff;
  font-weight: 800;
}

.reliability {
  background: #05070b;
}

.metrics {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}

.metrics div {
  min-height: 140px;
  border-left: 2px solid var(--blue);
  padding: 18px;
  background: linear-gradient(180deg, rgba(18, 27, 41, 0.9), rgba(8, 12, 19, 0.9));
}

.metrics strong {
  display: block;
  margin-bottom: 12px;
  font-size: 46px;
}

.metrics span {
  color: var(--muted);
}

.download {
  background:
    linear-gradient(180deg, rgba(9, 15, 24, 0.98), rgba(5, 7, 11, 1)),
    url("/assets/cas-banner.jpg") center / cover;
  background-blend-mode: multiply;
}

.download-panel {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 24px;
  background: rgba(5, 8, 13, 0.82);
}

.download-panel img {
  width: 100%;
  margin-bottom: 22px;
}

.download-panel .button + .button {
  margin-top: 12px;
}

.release-note {
  margin: 16px 0 0;
  color: #8794ab;
  font-size: 13px;
  text-align: center;
}

.footer {
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  background: #030508;
}

.footer-inner {
  min-height: 82px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  color: #95a2b8;
}

.footer a {
  color: #dbe6ff;
}

@media (max-width: 900px) {
  .topbar {
    position: absolute;
  }

  .nav {
    display: none;
  }

  .hero {
    min-height: 860px;
  }

  .hero-bg img {
    object-position: 63% center;
  }

  .hero-shade {
    background:
      linear-gradient(90deg, rgba(3, 5, 10, 0.94), rgba(3, 5, 10, 0.68)),
      linear-gradient(0deg, #05070b 0%, rgba(5, 7, 11, 0.18) 45%, rgba(5, 7, 11, 0.48) 100%);
  }

  .intro-grid,
  .product-grid,
  .reliability-grid,
  .download-grid,
  .feature-grid,
  .metrics {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 560px) {
  .brand img {
    width: 160px;
  }

  .hero {
    min-height: 760px;
  }

  .hero-content {
    margin-bottom: 42px;
  }

  .hero-actions,
  .button {
    width: 100%;
  }

  .button {
    padding-inline: 14px;
  }

  .feature {
    min-height: 0;
  }

  .interface {
    padding: 12px;
  }

  .mixer {
    height: 120px;
    gap: 8px;
  }

  .pad-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .footer-inner {
    flex-direction: column;
    justify-content: center;
  }
}