:root {
  color-scheme: dark;
  --bg: #05040d;
  --bg-alt: #08071a;
  --text: #f5f6ff;
  --text-muted: #9ea3b5;
  --accent: #38f4ff;
  --accent-soft: rgba(56, 244, 255, 0.08);
  --terminal-bg: rgba(8, 10, 26, 0.8);
  --terminal-border: rgba(56, 244, 255, 0.18);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Space Grotesk", -apple-system, BlinkMacSystemFont, "Segoe UI",
    sans-serif;
  background: radial-gradient(circle at top, #111033 0%, var(--bg) 45%)
    fixed var(--bg);
  color: var(--text);
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
  position: relative;
}

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

.grain {
  pointer-events: none;
  position: fixed;
  inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160' viewBox='0 0 160 160'%3E%3Cfilter id='a'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='3'%3E%3C/feTurbulence%3E%3CfeColorMatrix type='saturate' values='0'%3E%3C/feColorMatrix%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23a)' opacity='.08'%3E%3C/rect%3E%3C/svg%3E");
  z-index: 0;
  opacity: 0.6;
  mix-blend-mode: lighten;
}

.navbar {
  z-index: 2;
  position: sticky;
  top: 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 24px 6vw;
  backdrop-filter: blur(18px);
  background: linear-gradient(
      90deg,
      rgba(4, 4, 12, 0.78),
      rgba(8, 7, 28, 0.42)
    )
    0 0 / cover;
  border-bottom: 1px solid rgba(255, 255, 255, 0.04);
}

.brand {
  font-weight: 600;
  font-size: 20px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.nav-links {
  display: flex;
  gap: 20px;
  align-items: center;
  font-size: 14px;
  letter-spacing: 0.04em;
}

.nav-link {
  padding: 10px 18px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.04);
  color: var(--text-muted);
  border: 1px solid transparent;
  transition: border-color 0.2s ease, color 0.2s ease, transform 0.2s ease;
}

.nav-link:hover {
  color: var(--text);
  border-color: rgba(255, 255, 255, 0.18);
  transform: translateY(-1px);
}

.nav-link--highlight {
  font-family: "JetBrains Mono", "Fira Code", "SFMono-Regular", Consolas,
    "Liberation Mono", Menlo, monospace;
  font-size: 12px;
  color: var(--accent);
  background: rgba(56, 244, 255, 0.06);
  border-color: rgba(56, 244, 255, 0.2);
}

.hero {
  position: relative;
  flex: 1 1 auto;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 120px 6vw 140px;
  overflow: hidden;
}

.hero-backdrop {
  position: absolute;
  width: min(30vw, 420px);
  height: 120%;
  top: 10%;
  filter: blur(70px);
  opacity: 0.45;
  z-index: 1;
}

.hero-backdrop--left {
  left: -8vw;
  background: linear-gradient(160deg, #565a72 10%, rgba(10, 10, 28, 0) 70%);
  transform: rotate(-8deg);
}

.hero-backdrop--right {
  right: -8vw;
  background: linear-gradient(20deg, #1d253c 0%, rgba(8, 9, 20, 0) 75%);
  transform: rotate(8deg);
}

.hero-content {
  max-width: 750px;
  text-align: center;
  display: grid;
  gap: 24px;
  position: relative;
  z-index: 3;
}

.hero-kicker {
  display: inline-flex;
  align-self: center;
  padding: 9px 18px;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.28em;
  color: var(--text-muted);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 999px;
  background: rgba(14, 15, 32, 0.65);
}

.hero-title {
  margin: 0;
  font-size: clamp(48px, 8vw, 96px);
  font-weight: 600;
  letter-spacing: -0.02em;
}

.hero-subtitle {
  margin: 0 auto;
  max-width: 540px;
  font-size: clamp(18px, 2vw, 22px);
  color: var(--text-muted);
  line-height: 1.6;
}

.terminal {
  margin: 12px auto 0;
  max-width: min(100%, 620px);
  background: var(--terminal-bg);
  border: 1px solid var(--terminal-border);
  border-radius: 22px;
  overflow: hidden;
  box-shadow: 0 30px 80px rgba(0, 0, 0, 0.55),
    inset 0 0 0 1px rgba(255, 255, 255, 0.04);
  backdrop-filter: blur(18px);
}

.terminal-header {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 14px 20px;
  background: rgba(6, 6, 18, 0.7);
  border-bottom: 1px solid rgba(255, 255, 255, 0.04);
  font-family: "JetBrains Mono", "Fira Code", "SFMono-Regular", Consolas,
    "Liberation Mono", Menlo, monospace;
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.48);
}

.terminal-title {
  margin-left: auto;
}

.bullet {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  display: inline-block;
}

.bullet--red {
  background: #ff4f58;
}

.bullet--yellow {
  background: #febf2f;
}

.bullet--green {
  background: #38f58d;
}

.terminal-body {
  padding: 28px 30px 36px;
  font-family: "JetBrains Mono", "Fira Code", "SFMono-Regular", Consolas,
    "Liberation Mono", Menlo, monospace;
  font-size: 15px;
  line-height: 1.7;
  color: rgba(230, 237, 255, 0.9);
  min-height: 260px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  overflow: hidden;
}

.terminal-line {
  display: block;
  white-space: pre-wrap;
  opacity: 0;
  transform: translateY(8px);
  animation: lineIn 0.5s ease forwards;
}

.terminal-line--prompt::before {
  content: "polyai@agent:~$ ";
  color: rgba(56, 244, 255, 0.9);
}

.terminal-line--system {
  color: rgba(198, 203, 226, 0.88);
}

.terminal-line--success {
  color: #37f5a6;
}

.terminal-line--alert {
  color: #ff9d6c;
}

.terminal-line--info {
  color: rgba(137, 166, 255, 0.84);
}

.terminal-caret {
  display: inline-block;
  width: 10px;
  height: 1.2em;
  background: rgba(56, 244, 255, 0.9);
  margin-left: 6px;
  animation: caretBlink 1.1s steps(1) infinite;
}

@keyframes caretBlink {
  0%,
  49% {
    opacity: 1;
  }
  50%,
  100% {
    opacity: 0;
  }
}

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

@media (max-width: 768px) {
  .navbar {
    padding: 16px 20px;
    flex-direction: column;
    gap: 14px;
  }

  .nav-links {
    flex-wrap: wrap;
    justify-content: center;
  }

  .hero {
    padding: 80px 20px 100px;
  }

  .hero-backdrop {
    width: 260px;
    opacity: 0.38;
  }

  .terminal-body {
    font-size: 13px;
    padding: 24px;
    min-height: 220px;
  }
}