:root {
  --bg: #090d16;
  --bg-elev: #111a2b;
  --bg-soft: #15233a;
  --text: #eaf2ff;
  --muted: #a6b5cc;
  --brand: #5cd2ff;
  --brand-strong: #1fb5ff;
  --accent: #8bf0c3;
  --border: rgba(255, 255, 255, 0.12);
  --shadow: 0 20px 50px rgba(0, 0, 0, 0.45);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
  font-family: "Manrope", sans-serif;
  background: radial-gradient(circle at 10% 0%, #12203a 0%, var(--bg) 40%),
    linear-gradient(180deg, #0b1220 0%, #090d16 100%);
  color: var(--text);
  overflow-x: hidden;
}

.grid-overlay {
  position: fixed;
  inset: 0;
  pointer-events: none;
  opacity: 0.3;
  background-image: linear-gradient(
      rgba(255, 255, 255, 0.04) 1px,
      transparent 1px
    ),
    linear-gradient(90deg, rgba(255, 255, 255, 0.04) 1px, transparent 1px);
  background-size: 32px 32px;
  mask-image: radial-gradient(circle at center, black 25%, transparent 90%);
}

.ambient {
  position: fixed;
  border-radius: 50%;
  filter: blur(80px);
  z-index: -1;
  opacity: 0.35;
}

.ambient-1 {
  width: 340px;
  height: 340px;
  left: -120px;
  top: 180px;
  background: #0076ff;
}

.ambient-2 {
  width: 380px;
  height: 380px;
  right: -160px;
  top: 420px;
  background: #00bd8f;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 30;
  padding: 1rem clamp(1rem, 3vw, 2.5rem);
  display: flex;
  align-items: center;
  justify-content: space-between;
  backdrop-filter: blur(10px);
  background: rgba(11, 17, 30, 0.65);
  border-bottom: 1px solid rgba(255, 255, 255, 0.07);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  text-decoration: none;
  color: var(--text);
  font-weight: 700;
}

.brand-mark {
  width: 30px;
  height: 30px;
  display: inline-grid;
  place-items: center;
  border-radius: 9px;
  font-family: "Space Grotesk", sans-serif;
  background: linear-gradient(135deg, var(--brand) 0%, #39ffbf 100%);
  color: #091421;
}

.brand-name {
  font-family: "Space Grotesk", sans-serif;
  letter-spacing: 0.3px;
}

nav {
  display: flex;
  gap: clamp(0.8rem, 2.2vw, 1.8rem);
}

nav a {
  text-decoration: none;
  color: var(--muted);
  font-weight: 600;
  transition: color 220ms ease;
}

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

main {
  padding: 1.2rem clamp(1rem, 4vw, 5rem) 4rem;
}

.hero,
.section {
  max-width: 1200px;
  margin: 0 auto;
}

.hero {
  padding: clamp(2rem, 7vw, 6rem) 0 2rem;
}

.hero-product {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--border);
  border-radius: 24px;
  padding: clamp(1.5rem, 4vw, 3rem);
  min-height: clamp(460px, 62vh, 720px);
  isolation: isolate;
}

.hero-product .hero-shell {
  position: relative;
  z-index: 2;
}

.hero-product-media {
  position: absolute;
  inset: -5%;
  background-image: url("assets/indusaudio-product.png");
  background-size: cover;
  background-position: center;
  transform: translate3d(0, 0, 0) scale(1.05);
}

.hero-product-overlay {
  position: absolute;
  inset: 0;
  z-index: 1;
  background: linear-gradient(
      115deg,
      rgba(9, 13, 22, 0.9) 0%,
      rgba(9, 13, 22, 0.62) 45%,
      rgba(9, 13, 22, 0.82) 100%
    ),
    radial-gradient(circle at 75% 40%, rgba(31, 181, 255, 0.2), transparent 58%);
}

.hero-shell {
  display: grid;
  gap: 1.1rem;
  grid-template-columns: minmax(0, 1.2fr) minmax(0, 0.8fr);
  align-items: stretch;
}

.eyebrow {
  margin: 0 0 0.9rem;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  color: var(--accent);
  font-weight: 700;
}

h1,
h2,
h3 {
  margin: 0;
}

h1 {
  font-family: "Space Grotesk", sans-serif;
  font-size: clamp(2.1rem, 8vw, 4.9rem);
  line-height: 1.03;
  max-width: 920px;
}

.hero-copy {
  margin-top: 1.2rem;
  max-width: 720px;
  color: var(--muted);
  font-size: clamp(1rem, 2vw, 1.15rem);
  line-height: 1.8;
}

.hero-actions {
  margin-top: 1.8rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
}

.hero-chip {
  margin-top: 1rem;
  display: inline-flex;
  border: 1px solid rgba(139, 240, 195, 0.35);
  border-radius: 999px;
  padding: 0.38rem 0.72rem;
  color: var(--accent);
  font-size: 0.82rem;
  letter-spacing: 0.04em;
  background: rgba(139, 240, 195, 0.08);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid transparent;
  border-radius: 999px;
  padding: 0.7rem 1.2rem;
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text);
  background: transparent;
  text-decoration: none;
  white-space: nowrap;
  cursor: pointer;
  position: relative;
  overflow: hidden;
  transition: transform 220ms ease, box-shadow 240ms ease, border-color 220ms ease,
    background 220ms ease;
}

.btn::before {
  content: "";
  position: absolute;
  inset: 0;
  transform: translateX(-110%);
  background: linear-gradient(
    115deg,
    transparent 10%,
    rgba(255, 255, 255, 0.25) 45%,
    transparent 80%
  );
  transition: transform 550ms ease;
}

.btn:hover::before {
  transform: translateX(115%);
}

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

.btn:active {
  transform: translateY(1px) scale(0.99);
}

.btn:focus-visible {
  outline: 2px solid var(--brand);
  outline-offset: 2px;
}

.btn-primary {
  background: linear-gradient(135deg, var(--brand-strong), #2ce2c3);
  color: #03121f;
  box-shadow: 0 12px 30px rgba(30, 187, 255, 0.35);
}

.btn-primary:hover {
  box-shadow: 0 18px 34px rgba(30, 187, 255, 0.45);
}

.btn-outline {
  border-color: var(--border);
  background: rgba(255, 255, 255, 0.04);
}

.btn-ghost {
  border-color: rgba(255, 255, 255, 0.26);
}

.hero-stats {
  margin-top: 2.2rem;
  display: grid;
  gap: 0.95rem;
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.hero-stats article {
  padding: 1rem 1.1rem;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: linear-gradient(
    180deg,
    rgba(255, 255, 255, 0.06) 0%,
    rgba(255, 255, 255, 0.01) 100%
  );
}

.hero-stats h3 {
  font-family: "Space Grotesk", sans-serif;
  font-size: clamp(1.4rem, 3vw, 2rem);
}

.hero-stats p {
  margin: 0.3rem 0 0;
  color: var(--muted);
  font-size: 0.9rem;
}

.hero-panel {
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 1.2rem;
  background: linear-gradient(
    155deg,
    rgba(16, 24, 40, 0.96) 0%,
    rgba(10, 19, 34, 0.9) 52%,
    rgba(31, 181, 255, 0.14) 100%
  );
  box-shadow: var(--shadow);
}

.hero-panel > p {
  margin: 0;
  color: var(--accent);
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  font-weight: 700;
}

.hero-panel h3 {
  margin-top: 0.45rem;
  font-family: "Space Grotesk", sans-serif;
  font-size: clamp(1.45rem, 2.5vw, 2rem);
}

.hero-panel-copy {
  margin-top: 0.55rem;
  color: var(--muted);
  line-height: 1.65;
}

.signal-grid {
  margin-top: 1rem;
  height: 86px;
  display: flex;
  gap: 8px;
  align-items: end;
}

.signal-line {
  flex: 1;
  border-radius: 999px;
  background: linear-gradient(180deg, #6df8ca 0%, #22a4ff 100%);
  opacity: 0.9;
  animation: signalPulse 1.8s ease-in-out infinite;
}

.signal-line:nth-child(1) {
  height: 28%;
  animation-delay: 0.15s;
}

.signal-line:nth-child(2) {
  height: 78%;
  animation-delay: 0.3s;
}

.signal-line:nth-child(3) {
  height: 42%;
  animation-delay: 0.45s;
}

.signal-line:nth-child(4) {
  height: 91%;
  animation-delay: 0.6s;
}

.signal-line:nth-child(5) {
  height: 56%;
  animation-delay: 0.75s;
}

.signal-line:nth-child(6) {
  height: 70%;
  animation-delay: 0.9s;
}

.signal-line:nth-child(7) {
  height: 38%;
  animation-delay: 1.05s;
}

.section-link {
  margin-top: 1rem;
  display: inline-flex;
  text-decoration: none;
  color: var(--text);
  font-weight: 700;
  border-bottom: 1px solid rgba(255, 255, 255, 0.32);
  padding-bottom: 0.18rem;
}

.scroll-float-inner {
  will-change: transform;
  transition: transform 260ms ease;
}

.section {
  margin-top: clamp(2rem, 9vw, 7rem);
}

.section-head h2 {
  margin-top: 0.4rem;
  font-family: "Space Grotesk", sans-serif;
  font-size: clamp(1.6rem, 4.2vw, 2.8rem);
}

.card-grid {
  margin-top: 1.4rem;
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.glass-card {
  padding: 1.2rem;
  border: 1px solid var(--border);
  border-radius: 18px;
  background: linear-gradient(
    150deg,
    rgba(255, 255, 255, 0.08) 0%,
    rgba(255, 255, 255, 0.02) 52%,
    rgba(255, 255, 255, 0.05) 100%
  );
  box-shadow: var(--shadow);
  transition: transform 300ms ease, border-color 280ms ease;
  transform-style: preserve-3d;
}

.glass-card:hover {
  border-color: rgba(92, 210, 255, 0.55);
}

.glass-card h3 {
  font-family: "Space Grotesk", sans-serif;
  font-size: 1.12rem;
}

.glass-card p {
  margin: 0.8rem 0 0;
  color: var(--muted);
  line-height: 1.65;
}

.product-highlight {
  margin-top: 1.2rem;
  display: grid;
  gap: 1.1rem;
  grid-template-columns: minmax(0, 1.6fr) minmax(0, 0.7fr);
  align-items: start;
}

.product-highlight h3 {
  font-size: clamp(1.25rem, 2.4vw, 1.7rem);
}

.feature-list {
  margin: 0.9rem 0 0;
  padding-left: 1rem;
  color: var(--muted);
  line-height: 1.7;
}

.product-actions {
  display: grid;
  gap: 0.65rem;
}

.product-actions .btn {
  width: 100%;
}

.timeline {
  margin-top: 1.2rem;
  display: grid;
  gap: 0.9rem;
}

.timeline-item {
  display: grid;
  grid-template-columns: 56px 1fr;
  gap: 0.9rem;
  align-items: start;
  border: 1px solid var(--border);
  border-radius: 15px;
  padding: 1rem;
  background: rgba(17, 26, 43, 0.85);
}

.timeline-item span {
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  font-family: "Space Grotesk", sans-serif;
  border-radius: 10px;
  color: var(--brand);
  background: rgba(92, 210, 255, 0.12);
}

.timeline-item p,
.step p,
.cta p {
  margin: 0.5rem 0 0;
  color: var(--muted);
  line-height: 1.7;
}

.steps {
  margin-top: 1.35rem;
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.step {
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 1.15rem;
  background: linear-gradient(180deg, rgba(16, 27, 45, 0.95), rgba(9, 13, 22, 1));
}

.step h3 {
  font-size: 1.04rem;
}

.cta {
  text-align: center;
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: clamp(1.5rem, 5vw, 3.1rem);
  background: linear-gradient(
    125deg,
    rgba(31, 181, 255, 0.16) 0%,
    rgba(139, 240, 195, 0.09) 100%
  );
}

.cta h2 {
  font-family: "Space Grotesk", sans-serif;
  font-size: clamp(1.5rem, 4.2vw, 2.6rem);
}

.cta .btn {
  margin-top: 1.2rem;
}

footer {
  max-width: 1200px;
  margin: 3.4rem auto 2.6rem;
  padding: 0 clamp(1rem, 4vw, 5rem);
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  color: var(--muted);
  font-size: 0.9rem;
}

.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 720ms cubic-bezier(0.17, 0.84, 0.44, 1),
    transform 720ms cubic-bezier(0.17, 0.84, 0.44, 1);
}

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

@keyframes signalPulse {
  0%,
  100% {
    transform: scaleY(0.9);
    opacity: 0.82;
  }
  50% {
    transform: scaleY(1.05);
    opacity: 1;
  }
}

@media (max-width: 980px) {
  nav {
    display: none;
  }

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

  .hero-panel {
    max-width: 640px;
  }

  .card-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .product-highlight {
    grid-template-columns: 1fr;
  }

  .steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

@media (max-width: 720px) {
  .site-header {
    gap: 0.65rem;
  }

  .brand-name {
    display: none;
  }

  .site-header .btn {
    padding: 0.58rem 0.92rem;
    font-size: 0.86rem;
  }

  .card-grid,
  .steps {
    grid-template-columns: 1fr;
  }

  footer {
    flex-direction: column;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .reveal,
  .btn,
  .glass-card,
  .signal-line,
  .scroll-float-inner {
    transition: none;
    animation: none;
  }
}