:root {
  --ink-900: #0f172a;
  --ink-700: #1e293b;
  --ink-500: #475569;
  --surface: #f8fafc;
  --card: #ffffff;
  --line: #e2e8f0;
  --brand: #0f766e;
  --brand-strong: #0b525b;
  --accent: #f97316;
  --accent-strong: #ea580c;
  --focus: #14b8a6;
  --shadow: 0 20px 50px rgba(15, 23, 42, 0.08);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  font-family: "IBM Plex Sans", sans-serif;
  color: var(--ink-700);
  background:
    radial-gradient(circle at 15% 12%, #99f6e4 0%, #99f6e400 30%),
    radial-gradient(circle at 85% 20%, #fed7aa 0%, #fed7aa00 35%),
    var(--surface);
}

h1,
h2,
h3,
.brand {
  font-family: "Sora", sans-serif;
  color: var(--ink-900);
  margin: 0;
}

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

.bg-orb {
  position: fixed;
  border-radius: 999px;
  pointer-events: none;
  z-index: -1;
  filter: blur(40px);
}

.orb-1 {
  width: 280px;
  height: 280px;
  top: 16vh;
  left: -80px;
  background: #2dd4bf66;
}

.orb-2 {
  width: 360px;
  height: 360px;
  top: 40vh;
  right: -120px;
  background: #fb923c44;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 5vw;
  border-bottom: 1px solid var(--line);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
  background: #f8fafce6;
}

.brand {
  font-weight: 800;
  font-size: 1.1rem;
}

.site-nav {
  display: flex;
  gap: 1.15rem;
  font-weight: 600;
  color: var(--ink-500);
}

.site-nav a:hover {
  color: var(--ink-900);
}

main {
  width: min(1180px, 92vw);
  margin: 0 auto;
  padding: 2rem 0 4rem;
}

.hero {
  padding: 4rem 0 2rem;
}

.kicker {
  display: inline-block;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  font-size: 0.78rem;
  color: var(--brand);
  margin: 0 0 0.7rem;
}

.hero h1 {
  font-size: clamp(2rem, 4.4vw, 3.8rem);
  line-height: 1.05;
  max-width: 16ch;
}

.hero-copy {
  max-width: 62ch;
  margin-top: 1.2rem;
  font-size: clamp(1rem, 2.1vw, 1.18rem);
  color: var(--ink-500);
}

.hero-cta {
  margin-top: 1.6rem;
  display: flex;
  gap: 0.85rem;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.72rem 1.05rem;
  border-radius: 999px;
  border: 1px solid transparent;
  font-weight: 700;
  transition: transform 180ms ease, background-color 180ms ease, border-color 180ms ease;
}

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

.btn.primary {
  color: #fff;
  background: var(--brand);
}

.btn.primary:hover {
  background: var(--brand-strong);
}

.btn.secondary {
  border-color: var(--line);
  background: #ffffffa6;
}

.btn.secondary:hover {
  border-color: #cbd5e1;
  background: #fff;
}

.btn.youtube {
  background: #dc2626;
  color: #fff;
}

.btn.youtube:hover {
  background: #b91c1c;
}

.section,
.feature,
.store {
  margin-top: 2.2rem;
}

.feature,
.store {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1.2rem;
  padding: 1.35rem;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: var(--card);
  box-shadow: var(--shadow);
}

.section h2 {
  font-size: clamp(1.35rem, 2.3vw, 2rem);
  margin-bottom: 1rem;
}

.section-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1rem;
}

.gpt-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(245px, 1fr));
  gap: 1rem;
}

.card {
  display: grid;
  grid-template-rows: 165px auto;
  border: 1px solid var(--line);
  border-radius: 16px;
  overflow: hidden;
  background: var(--card);
  box-shadow: var(--shadow);
}

.card img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.card-body {
  padding: 0.92rem;
}

.card h3 {
  font-size: 1rem;
  margin-bottom: 0.35rem;
}

.card p {
  margin: 0;
  font-size: 0.93rem;
  color: var(--ink-500);
  line-height: 1.45;
}

.card a {
  margin-top: 0.72rem;
  display: inline-block;
  font-weight: 700;
  color: var(--accent);
}

.card a:hover {
  color: var(--accent-strong);
}

.video-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1rem;
}

.video-frame {
  border-radius: 18px;
  overflow: hidden;
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
  background: #fff;
  aspect-ratio: 16 / 9;
}

.video-frame iframe {
  width: 100%;
  height: 100%;
  border: none;
}

.site-footer {
  width: min(1180px, 92vw);
  margin: 1.5rem auto 3rem;
  padding: 1.4rem;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: #ffffffde;
}

.site-footer h3 {
  margin-bottom: 0.5rem;
}

.footer-links {
  margin: 0.8rem 0;
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  color: var(--ink-500);
}

.footer-links a:hover {
  color: var(--brand-strong);
}

.copyright {
  color: var(--ink-500);
  font-size: 0.88rem;
  margin: 0;
}

.reveal {
  opacity: 0;
  transform: translateY(18px);
  animation: rise 600ms ease forwards;
}

.reveal:nth-of-type(2) { animation-delay: 110ms; }
.reveal:nth-of-type(3) { animation-delay: 190ms; }
.reveal:nth-of-type(4) { animation-delay: 260ms; }
.reveal:nth-of-type(5) { animation-delay: 320ms; }

@keyframes rise {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 860px) {
  .site-header {
    position: static;
    flex-direction: column;
    align-items: flex-start;
    gap: 0.45rem;
  }

  .feature,
  .store {
    flex-direction: column;
    align-items: flex-start;
  }

  .section-head {
    flex-direction: column;
    align-items: flex-start;
  }
}

@media (prefers-reduced-motion: reduce) {
  .reveal {
    opacity: 1;
    transform: none;
    animation: none;
  }

  .btn {
    transition: none;
  }
}