/* ── Reset & custom properties ─────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --color-bg:        #0a0a0f;
  --color-surface:   #12121a;
  --color-border:    #1e1e2e;
  --color-primary:   #7c6af5;
  --color-primary-h: #9b8fff;
  --color-accent:    #40e0d0;
  --color-text:      #e2e2f0;
  --color-muted:     #8080a0;
  --font-sans:       'Inter', system-ui, sans-serif;
  --font-mono:       'JetBrains Mono', 'Fira Code', monospace;
  --radius:          0.75rem;
  --transition:      0.2s ease;
  --max-width:       72rem;
}

html { scroll-behavior: smooth; }

body {
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-sans);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

/* ── Utility ──────────────────────────────────────────────────────── */
.container {
  width: min(100%, var(--max-width));
  margin-inline: auto;
  padding-inline: 1.5rem;
}

.section-title {
  font-size: clamp(1.6rem, 4vw, 2.4rem);
  font-weight: 700;
  text-align: center;
  margin-bottom: 0.75rem;
}

.section-subtitle {
  color: var(--color-muted);
  text-align: center;
  max-width: 42rem;
  margin-inline: auto;
  margin-bottom: 3rem;
}

/* ── Buttons ──────────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.65rem 1.4rem;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 0.95rem;
  text-decoration: none;
  transition: background var(--transition), color var(--transition), border-color var(--transition), box-shadow var(--transition);
  cursor: pointer;
  border: 2px solid transparent;
}

.btn--primary {
  background: var(--color-primary);
  color: #fff;
}
.btn--primary:hover { background: var(--color-primary-h); box-shadow: 0 0 16px color-mix(in srgb, var(--color-primary) 60%, transparent); }

.btn--secondary {
  background: var(--color-surface);
  color: var(--color-text);
  border-color: var(--color-border);
}
.btn--secondary:hover { border-color: var(--color-primary); color: var(--color-primary); }

.btn--outline {
  color: var(--color-text);
  border-color: var(--color-border);
}
.btn--outline:hover { border-color: var(--color-primary); color: var(--color-primary); }

/* ── Navigation ───────────────────────────────────────────────────── */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: color-mix(in srgb, var(--color-bg) 85%, transparent);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 4rem;
}

.nav__logo {
  font-size: 1.25rem;
  font-weight: 800;
  text-decoration: none;
  color: var(--color-text);
  letter-spacing: -0.5px;
}

.nav__links {
  display: flex;
  list-style: none;
  gap: 2rem;
  align-items: center;
}

.nav__links a {
  color: var(--color-muted);
  text-decoration: none;
  font-size: 0.9rem;
  transition: color var(--transition);
}
.nav__links a:hover { color: var(--color-text); }

.nav__toggle { display: none; }

/* ── Hero ─────────────────────────────────────────────────────────── */
.hero {
  padding: 6rem 0 5rem;
  text-align: center;
}

.hero__badge {
  display: inline-block;
  background: color-mix(in srgb, var(--color-primary) 15%, transparent);
  color: var(--color-primary-h);
  border: 1px solid color-mix(in srgb, var(--color-primary) 40%, transparent);
  border-radius: 999px;
  padding: 0.25rem 1rem;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin-bottom: 1.5rem;
}

.hero__title {
  font-size: clamp(2rem, 6vw, 3.75rem);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -1px;
  margin-bottom: 1.25rem;
  background: linear-gradient(135deg, var(--color-text) 40%, var(--color-accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero__subtitle {
  color: var(--color-muted);
  font-size: 1.1rem;
  max-width: 44rem;
  margin-inline: auto;
  margin-bottom: 2.5rem;
}

.hero__actions {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 3rem;
}

.hero__code {
  display: inline-block;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1rem 1.5rem;
  text-align: left;
}

.hero__code pre { margin: 0; }

.hero__code code {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: var(--color-accent);
}

/* ── Features ─────────────────────────────────────────────────────── */
.features {
  padding: 5rem 0;
  border-top: 1px solid var(--color-border);
}

.features__grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(17rem, 1fr));
  gap: 1.5rem;
}

.feature-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.75rem;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.feature-card:hover {
  border-color: var(--color-primary);
  box-shadow: 0 0 24px color-mix(in srgb, var(--color-primary) 15%, transparent);
}

.feature-card__icon {
  font-size: 1.75rem;
  margin-bottom: 1rem;
}

.feature-card h3 {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.feature-card p {
  color: var(--color-muted);
  font-size: 0.9rem;
}

.feature-card code {
  font-family: var(--font-mono);
  font-size: 0.85em;
  color: var(--color-accent);
}

/* ── How it works ──────────────────────────────────────────────────── */
.how-it-works {
  padding: 5rem 0;
  border-top: 1px solid var(--color-border);
}

.steps {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 2rem;
  max-width: 52rem;
  margin-inline: auto;
}

.step {
  display: flex;
  gap: 2rem;
  align-items: flex-start;
}

.step__number {
  flex-shrink: 0;
  width: 3rem;
  height: 3rem;
  border-radius: 50%;
  background: color-mix(in srgb, var(--color-primary) 20%, transparent);
  border: 1px solid color-mix(in srgb, var(--color-primary) 50%, transparent);
  color: var(--color-primary-h);
  font-weight: 700;
  font-size: 0.85rem;
  display: flex;
  align-items: center;
  justify-content: center;
}

.step__content h3 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 0.4rem;
}

.step__content p {
  color: var(--color-muted);
  font-size: 0.95rem;
}

.step__content code {
  font-family: var(--font-mono);
  font-size: 0.85em;
  color: var(--color-accent);
}

/* ── Quickstart ───────────────────────────────────────────────────── */
.quickstart {
  padding: 5rem 0;
  border-top: 1px solid var(--color-border);
}

.quickstart__steps {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  max-width: 52rem;
  margin-inline: auto;
}

.qs-step {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
}

.qs-step__label {
  display: block;
  padding: 0.6rem 1.25rem;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--color-muted);
  border-bottom: 1px solid var(--color-border);
}

.qs-step pre {
  padding: 1rem 1.25rem;
  margin: 0;
  overflow-x: auto;
}

.qs-step code {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  color: var(--color-accent);
}

/* ── Chat CTA ─────────────────────────────────────────────────────── */
.cta-chat {
  padding: 5rem 0;
  border-top: 1px solid var(--color-border);
  background: linear-gradient(135deg,
    color-mix(in srgb, var(--color-primary) 8%, transparent),
    color-mix(in srgb, var(--color-accent) 5%, transparent));
}

.cta-chat__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
  flex-wrap: wrap;
}

.cta-chat__text h2 {
  font-size: clamp(1.4rem, 3vw, 2rem);
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.cta-chat__text p {
  color: var(--color-muted);
  max-width: 38rem;
}

.btn--lg {
  padding: 0.85rem 2rem;
  font-size: 1rem;
  white-space: nowrap;
}

@media (max-width: 640px) {
  .cta-chat__inner { flex-direction: column; text-align: center; }
}

/* ── Footer ───────────────────────────────────────────────────────── */
.site-footer {
  border-top: 1px solid var(--color-border);
  padding: 2.5rem 0;
}

.footer__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
  font-size: 0.875rem;
  color: var(--color-muted);
}

.footer__inner a {
  color: var(--color-muted);
  text-decoration: none;
  transition: color var(--transition);
}
.footer__inner a:hover { color: var(--color-text); }

/* ── Responsive ───────────────────────────────────────────────────── */
@media (max-width: 640px) {
  .nav__links { display: none; }
  .nav__links.is-open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 4rem;
    left: 0;
    right: 0;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    padding: 1.5rem;
    gap: 1rem;
  }

  .nav__toggle {
    display: flex;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.25rem;
  }
  .nav__toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--color-text);
    border-radius: 2px;
    transition: transform var(--transition), opacity var(--transition);
  }
  .nav__toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
  .nav__toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
  .nav__toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

  .step { flex-direction: column; gap: 0.75rem; }
  .footer__inner { flex-direction: column; text-align: center; }
}