:root {
  --bg: #ffffff;
  --bg-soft: #f5f9ff;
  --bg-card: #0f2744;
  --bg-card-strong: #133154;
  --line: rgba(19, 49, 84, 0.12);
  --line-strong: rgba(42, 184, 255, 0.34);
  --text: #10233a;
  --text-soft: #45607f;
  --text-muted: #6c8099;
  --cyan: #6ee6ff;
  --cyan-strong: #2ab8ff;
  --gold: #f3c56d;
  --gold-deep: #d49c33;
  --shadow: 0 22px 50px rgba(15, 39, 68, 0.14);
  --radius-lg: 28px;
  --radius-md: 20px;
  --radius-sm: 14px;
  --max-width: 1180px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--text);
  background: #ffffff;
  font-family: "Space Grotesk", sans-serif;
  min-height: 100vh;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background:
    linear-gradient(rgba(19, 49, 84, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(19, 49, 84, 0.035) 1px, transparent 1px);
  background-size: 84px 84px;
  mask-image: radial-gradient(circle at center, black 40%, transparent 88%);
  opacity: 0.55;
}

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

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

.page-shell {
  position: relative;
  width: min(calc(100% - 32px), var(--max-width));
  margin: 0 auto;
  padding-bottom: 0;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  margin: 0 calc(50% - 50vw);
  padding: 18px max(24px, calc((100vw - var(--max-width)) / 2 + 18px));
  border-bottom: 1px solid var(--line);
  border-radius: 0;
  background: rgba(15, 39, 68, 0.98);
  backdrop-filter: blur(18px);
  box-shadow: var(--shadow);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: #ffffff;
  font-family: "Sora", sans-serif;
  font-weight: 700;
  letter-spacing: 0.03em;
}

.brand-mark {
  width: 38px;
  height: 38px;
  object-fit: contain;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 22px;
  color: rgba(255, 255, 255, 0.8);
}

.site-nav a {
  position: relative;
  font-size: 0.96rem;
}

.site-nav a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -6px;
  width: 100%;
  height: 2px;
  transform: scaleX(0);
  transform-origin: left;
  background: linear-gradient(90deg, var(--cyan), transparent);
  transition: transform 180ms ease;
}

.site-nav a:hover::after,
.site-nav a:focus-visible::after {
  transform: scaleX(1);
}

.menu-toggle {
  display: none;
  width: 46px;
  height: 46px;
  padding: 0;
  border: 1px solid var(--line);
  border-radius: 50%;
  background: transparent;
}

.menu-toggle span {
  display: block;
  width: 18px;
  height: 2px;
  margin: 5px auto;
  background: #ffffff;
  transition: transform 180ms ease, opacity 180ms ease;
}

.hero {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 42px;
  align-items: center;
  padding: 74px 0 42px;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 16px;
  color: var(--cyan);
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.eyebrow::before {
  content: "";
  width: 34px;
  height: 1px;
  background: linear-gradient(90deg, var(--cyan), transparent);
}

.hero h1,
.section-heading h2 {
  margin: 0;
  font-family: "Sora", sans-serif;
  line-height: 1.02;
}

.hero h1 {
  max-width: 11ch;
  font-size: clamp(2rem, 3.5vw, 3.6rem);
  letter-spacing: -0.04em;
}

.hero-text,
.section-heading p,
.architecture-copy p,
.feature-card p,
.principle-card p,
.faq-list p {
  color: var(--text-soft);
  line-height: 1.7;
}

.feature-card h3,
.principle-card h3,
.architecture-panel h3,
.faq-list summary {
  color: var(--gold);
}

.prompt-card,
.architecture-copy p,
.feature-card p,
.principle-card p,
.faq-list p {
  color: #e1eefb;
}

.hero-text {
  max-width: 62ch;
  margin: 18px 0 24px;
  font-size: 0.92rem;
}

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

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  min-height: 52px;
  padding: 0 22px;
  border-radius: 999px;
  border: 1px solid transparent;
  font-weight: 700;
  transition: transform 180ms ease, box-shadow 180ms ease, border-color 180ms ease;
}

.button-icon {
  width: 18px;
  height: 18px;
  flex: 0 0 18px;
}

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

.button-primary {
  color: #04101b;
  background: linear-gradient(135deg, var(--cyan) 0%, #a9f2ff 100%);
  box-shadow: 0 18px 40px rgba(42, 184, 255, 0.24);
}

.button-secondary {
  color: var(--text);
  border-color: var(--line-strong);
  background: rgba(255, 255, 255, 0.75);
}

.bullet-list {
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
}

.bullet-list li {
  position: relative;
  padding-left: 22px;
  color: var(--text-soft);
  line-height: 1.8;
}

.bullet-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.85em;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--cyan), var(--gold));
  box-shadow: 0 0 18px rgba(110, 230, 255, 0.5);
}

.hero-visual {
  position: relative;
  isolation: isolate;
  background: transparent;
}

.hero-glow {
  display: none;
}

.hero-image {
  width: min(100%, 560px);
  margin-inline: auto;
  background: transparent;
}

.feature-grid,
.principles,
.prompt-grid,
.example-gallery {
  display: grid;
  gap: 18px;
}

.feature-card,
.principle-card,
.prompt-card,
.terminal-card,
.architecture-panel,
.faq-list details {
  border: 1px solid var(--line);
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  box-shadow: var(--shadow);
  transition: transform 180ms ease, border-color 180ms ease, box-shadow 180ms ease;
}

.feature-card:hover,
.feature-card:focus-within,
.principle-card:hover,
.principle-card:focus-within,
.prompt-card:hover,
.prompt-card:focus-within,
.terminal-card:hover,
.terminal-card:focus-within,
.architecture-panel:hover,
.architecture-panel:focus-within,
.faq-list details:hover,
.faq-list details:focus-within {
  border-color: var(--gold);
  box-shadow:
    0 22px 50px rgba(15, 39, 68, 0.14),
    0 0 0 2px rgba(243, 197, 109, 0.65),
    0 0 0 6px rgba(243, 197, 109, 0.12);
}

.section {
  padding: 56px 0;
  scroll-margin-top: 82px;
}

.section-alt {
  position: relative;
}

.section-heading {
  max-width: 720px;
  margin-bottom: 28px;
}

.section-heading h2 {
  font-size: clamp(1.8rem, 3vw, 2.7rem);
  letter-spacing: -0.035em;
}

.section-heading p {
  margin-top: 16px;
  font-size: 0.92rem;
}

.feature-grid,
.principles {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.feature-card,
.principle-card {
  min-height: 190px;
  padding: 24px;
  border-radius: var(--radius-md);
}

.feature-card h3,
.principle-card h3 {
  margin: 0 0 12px;
  font-family: "Sora", sans-serif;
  font-size: 1.15rem;
}

.architecture-panel {
  padding: 28px;
  border-radius: var(--radius-lg);
  background:
    linear-gradient(180deg, #133154, #0f2744);
}

.flow-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
  justify-content: center;
  margin-bottom: 24px;
}

.flow-chip,
.flow-arrow {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
}

.flow-chip {
  padding: 0 18px;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.06);
  color: #f4fbff;
  font-weight: 700;
}

.flow-arrow {
  color: var(--gold);
  font-size: 1.4rem;
}

.quickstart-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  align-items: start;
}

.quickstart-layout-wide {
  grid-template-columns: 1fr;
}

.terminal-card {
  border-radius: var(--radius-md);
}

.terminal-card-wide {
  width: 100%;
}

.terminal-card {
  overflow: hidden;
}

.terminal-bar {
  display: flex;
  gap: 8px;
  padding: 12px 16px;
  border-bottom: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.06);
}

.terminal-bar span {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.18);
}

.terminal-bar span:nth-child(1) { background: #ff7f66; }
.terminal-bar span:nth-child(2) { background: #ffcf5c; }
.terminal-bar span:nth-child(3) { background: #56d364; }

.terminal-card pre {
  margin: 0;
  padding: 28px 26px 30px;
  overflow: auto;
  color: #eef7ff;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 1rem;
  line-height: 1.9;
}

.terminal-prefix {
  color: var(--gold);
}

.prompt-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.example-gallery {
  grid-template-columns: repeat(3, minmax(0, 1fr));
  align-items: start;
}

.example-shot {
  margin: 0;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 30px;
  background: var(--bg-card);
  box-shadow: var(--shadow);
}

.example-shot img {
  width: 100%;
  border-radius: 20px;
}

.prompt-card {
  position: relative;
  padding: 22px 22px 22px 56px;
  border-radius: var(--radius-md);
  color: #d5e7f8;
  line-height: 1.65;
}

.prompt-card::before {
  content: ">";
  position: absolute;
  left: 22px;
  top: 20px;
  color: var(--cyan);
  font-family: "Sora", sans-serif;
  font-size: 1.5rem;
  font-weight: 700;
}

.faq-list {
  display: grid;
  gap: 14px;
}

.faq-list details {
  padding: 18px 20px;
  border-radius: var(--radius-md);
}

.faq-list summary {
  cursor: pointer;
  font-family: "Sora", sans-serif;
  font-weight: 700;
}

.faq-list p {
  margin: 14px 0 4px;
}

.site-footer {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  margin: 32px calc(50% - 50vw) 0;
  padding: 18px max(24px, calc((100vw - var(--max-width)) / 2 + 18px));
  border-top: 1px solid var(--line);
  background: rgba(15, 39, 68, 0.98);
  color: rgba(255, 255, 255, 0.78);
  font-size: 0.95rem;
  box-shadow: var(--shadow);
}

.reveal {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 500ms ease, transform 500ms ease;
}

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

@media (max-width: 1024px) {
  .hero,
  .quickstart-layout {
    grid-template-columns: 1fr;
  }

  .hero {
    padding-top: 56px;
  }

  .feature-grid,
  .principles,
  .prompt-grid,
  .example-gallery {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

}

@media (max-width: 760px) {
  .page-shell {
    width: min(calc(100% - 20px), var(--max-width));
  }

  .site-header {
    align-items: flex-start;
    border-radius: 0;
    padding: 16px 18px;
    margin: 0;
  }

  .site-footer {
    margin: 28px 0 0;
    padding: 16px 18px;
  }

  .menu-toggle {
    display: inline-block;
    margin-left: auto;
  }

  .site-nav {
    position: absolute;
    left: 0;
    right: 0;
    top: calc(100% + 10px);
    display: none;
    flex-direction: column;
    align-items: flex-start;
    padding: 18px;
    border: 1px solid var(--line);
    border-radius: 24px;
    background: rgba(5, 12, 24, 0.95);
  }

  .site-footer {
    flex-direction: column;
  }

  .site-header.nav-open .site-nav {
    display: flex;
  }

  .site-header.nav-open .menu-toggle span:first-child {
    transform: translateY(7px) rotate(45deg);
  }

  .site-header.nav-open .menu-toggle span:last-child {
    transform: translateY(-7px) rotate(-45deg);
  }

  .site-header.nav-open .menu-toggle span:nth-child(2) {
    opacity: 0;
  }

  .hero h1 {
    max-width: 12ch;
  }

  .feature-grid,
  .principles,
  .prompt-grid,
  .example-gallery {
    grid-template-columns: 1fr;
  }

  .flow-row {
    flex-direction: column;
    align-items: stretch;
  }

  .flow-chip,
  .flow-arrow {
    width: 100%;
  }

  .flow-arrow {
    min-height: 20px;
    transform: rotate(90deg);
  }

  .site-footer {
    flex-direction: column;
  }
}