/* ============================================================
   Dummy AI — download site
   ============================================================ */
:root {
  --bg: #0f0f0f;
  --bg-2: #161616;
  --surface: #1a1a1a;
  --elevated: #242424;
  --border: #2e2e2e;
  --text: #f0f0f0;
  --muted: #8a8a8a;
  --warm: #ffa800;
  --warm-dim: #b38c30;
  --cool: #4fc3f7;
  --radius: 16px;
  --max: 1080px;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
html {
  scroll-behavior: smooth;
}
body {
  font-family: "Geist", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  -webkit-font-smoothing: antialiased;
  line-height: 1.55;
  overflow-x: hidden;
}
a {
  color: inherit;
  text-decoration: none;
}
img {
  display: block;
  -webkit-user-drag: none;
}

/* ---- buttons ---- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--warm);
  color: #1a1a1a;
  font-weight: 700;
  padding: 12px 22px;
  border-radius: 999px;
  transition: transform 120ms ease, box-shadow 200ms ease, background 120ms ease;
  box-shadow: 0 6px 24px rgba(255, 168, 0, 0.25);
}
.btn:hover {
  transform: translateY(-2px);
  background: #ffb938;
  box-shadow: 0 10px 30px rgba(255, 168, 0, 0.35);
}
.btn-lg {
  padding: 15px 28px;
  font-size: 16px;
}
.btn-sm {
  padding: 8px 16px;
  font-size: 14px;
}

/* ---- nav ---- */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  gap: 20px;
  padding: 14px 28px;
  max-width: var(--max);
  margin: 0 auto;
  backdrop-filter: blur(10px);
}
.nav::before {
  content: "";
  position: absolute;
  inset: 0;
  background: rgba(15, 15, 15, 0.7);
  border-bottom: 1px solid var(--border);
  z-index: -1;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  font-size: 18px;
  letter-spacing: -0.3px;
}
.brand-logo {
  width: 28px;
  height: 28px;
  border-radius: 7px;
  object-fit: cover;
}
.nav-links {
  display: flex;
  gap: 22px;
  margin-left: auto;
  font-size: 14px;
}
.nav-links a {
  color: var(--muted);
  transition: color 120ms ease;
}
.nav-links a:hover {
  color: var(--text);
}

/* ---- hero ---- */
.hero {
  position: relative;
  padding: 70px 28px 90px;
  overflow: hidden;
}
.hero-glow {
  position: absolute;
  top: -200px;
  left: 50%;
  transform: translateX(-50%);
  width: 900px;
  height: 600px;
  background: radial-gradient(
    ellipse at center,
    rgba(255, 168, 0, 0.18),
    rgba(79, 195, 247, 0.08) 45%,
    transparent 70%
  );
  filter: blur(20px);
  pointer-events: none;
}
.hero-inner {
  position: relative;
  max-width: var(--max);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  align-items: center;
  gap: 40px;
}
.pill {
  display: inline-block;
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--muted);
  padding: 6px 14px;
  border-radius: 999px;
  font-size: 13px;
  margin-bottom: 22px;
}
.hero h1 {
  font-size: clamp(34px, 5vw, 56px);
  line-height: 1.05;
  letter-spacing: -1.5px;
  font-weight: 800;
  background: linear-gradient(120deg, #fff 30%, var(--warm));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.lead {
  margin: 20px 0 30px;
  font-size: 18px;
  color: #cfcfcf;
  max-width: 520px;
}
.lead b {
  color: var(--text);
}
.hero-actions {
  display: flex;
  align-items: center;
  gap: 18px;
  flex-wrap: wrap;
}
.hero-sub {
  font-size: 13px;
  color: var(--muted);
}
.hero-art {
  display: flex;
  justify-content: center;
}
.mascot-float {
  width: min(340px, 80%);
  filter: drop-shadow(0 24px 50px rgba(0, 0, 0, 0.5));
  animation: float 5s ease-in-out infinite;
}
@keyframes float {
  0%,
  100% {
    transform: translateY(0) rotate(-1deg);
  }
  50% {
    transform: translateY(-16px) rotate(1deg);
  }
}

/* ---- sections ---- */
.section {
  max-width: var(--max);
  margin: 0 auto;
  padding: 70px 28px;
}
.section-alt {
  background: var(--bg-2);
  max-width: 100%;
}
.section-alt > * {
  max-width: var(--max);
  margin-left: auto;
  margin-right: auto;
}
.section-title {
  font-size: clamp(26px, 3.5vw, 38px);
  font-weight: 800;
  letter-spacing: -0.8px;
  text-align: center;
  margin-bottom: 44px;
}

/* ---- modes ---- */
.modes {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 22px;
}
.mode-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  transition: transform 200ms ease, border-color 200ms ease;
}
.mode-card:hover {
  transform: translateY(-4px);
  border-color: var(--warm-dim);
}
.mode-card-cool:hover {
  border-color: var(--cool);
}
.mode-mascot {
  width: 88px;
  height: 88px;
  object-fit: contain;
  margin-bottom: 16px;
}
.mode-card h3 {
  font-size: 22px;
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  gap: 10px;
}
.mode-card p {
  color: var(--muted);
}
.mode-card p b {
  color: var(--text);
}
.tag {
  font-size: 12px;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: 999px;
}
.tag-warm {
  background: rgba(255, 168, 0, 0.15);
  color: var(--warm);
}
.tag-cool {
  background: rgba(79, 195, 247, 0.15);
  color: var(--cool);
}

/* ---- features ---- */
.features {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}
.feature {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 22px;
  transition: transform 150ms ease;
}
.feature:hover {
  transform: translateY(-3px);
}
.feat-ico {
  font-size: 26px;
  margin-bottom: 10px;
}
.feature h4 {
  font-size: 17px;
  margin-bottom: 6px;
}
.feature p {
  color: var(--muted);
  font-size: 14px;
}

/* ---- download ---- */
.download {
  display: flex;
  justify-content: center;
}
.download-card {
  text-align: center;
  background: linear-gradient(160deg, var(--surface), var(--bg-2));
  border: 1px solid var(--border);
  border-radius: 22px;
  padding: 48px 36px;
  max-width: 620px;
  width: 100%;
  position: relative;
  overflow: hidden;
}
.download-card::before {
  content: "";
  position: absolute;
  top: -120px;
  left: 50%;
  transform: translateX(-50%);
  width: 400px;
  height: 300px;
  background: radial-gradient(ellipse, rgba(255, 168, 0, 0.18), transparent 70%);
  pointer-events: none;
}
.download-logo {
  width: 64px;
  height: 64px;
  border-radius: 16px;
  margin: 0 auto 16px;
  object-fit: cover;
}
.download-card h2 {
  font-size: 30px;
  letter-spacing: -0.5px;
}
.download-sub {
  color: var(--muted);
  margin: 6px 0 26px;
}
.download-notes {
  list-style: none;
  margin-top: 26px;
  text-align: left;
  display: inline-block;
  color: var(--muted);
  font-size: 13.5px;
}
.download-notes li {
  position: relative;
  padding-left: 22px;
  margin: 9px 0;
}
.download-notes li::before {
  content: "→";
  position: absolute;
  left: 0;
  color: var(--cool);
}
.download-notes b {
  color: var(--text);
}

/* ---- footer ---- */
.footer {
  border-top: 1px solid var(--border);
  padding: 36px 28px;
}
.footer-inner {
  max-width: var(--max);
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
}
.footer-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
}
.footer-links {
  display: flex;
  gap: 18px;
  color: var(--muted);
  font-size: 14px;
}
.footer-links a:hover {
  color: var(--text);
}
.footer-credit {
  margin-left: auto;
  color: var(--muted);
  font-size: 13px;
}
.footer-credit a {
  color: var(--warm);
}

/* ---- responsive ---- */
@media (max-width: 800px) {
  .hero-inner {
    grid-template-columns: 1fr;
    text-align: center;
  }
  .hero-copy .pill {
    margin-inline: auto;
  }
  .lead {
    margin-inline: auto;
  }
  .hero-actions {
    justify-content: center;
  }
  .hero-art {
    order: -1;
  }
  .mascot-float {
    width: 200px;
  }
  .modes,
  .features {
    grid-template-columns: 1fr;
  }
  .nav-links {
    display: none;
  }
  .footer-credit {
    margin-left: 0;
    width: 100%;
  }
}