/* ===== Katalyst — clean dark theme, green gradient accents ===== */
:root {
  --bg: #05080a;
  --bg-soft: #0a0f10;
  --bg-card: rgba(255, 255, 255, 0.022);
  --border: rgba(110, 240, 180, 0.1);
  --border-strong: rgba(110, 240, 180, 0.26);
  --text: #eaf3ee;
  --text-dim: #93a59c;
  --text-mute: #5e6f67;
  --accent: #3ddc84;
  --accent-2: #1fb98a;
  --accent-soft: rgba(61, 220, 132, 0.1);
  --grad: linear-gradient(105deg, #5cf2a0 0%, #3ddc84 45%, #18c79a 100%);
  --maxw: 1120px;
  --r: 16px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: 'Inter', system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  letter-spacing: -0.01em;
}
.container { max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }
.container.narrow { max-width: 800px; }

/* soft green glow behind hero */
.bg-glow {
  position: fixed; inset: 0; z-index: 0; pointer-events: none;
  background:
    radial-gradient(ellipse 70% 50% at 50% -10%, rgba(61, 220, 132, 0.12), transparent 60%),
    radial-gradient(ellipse 50% 40% at 85% 8%, rgba(24, 199, 154, 0.08), transparent 60%);
}
.nav, main, .footer { position: relative; z-index: 1; }

/* ===== Buttons ===== */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 13px 26px; border-radius: 100px;
  font-weight: 600; font-size: 0.95rem; text-decoration: none;
  color: #04130c; background: var(--grad); border: none; cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}
.btn:hover { transform: translateY(-2px); box-shadow: 0 10px 32px rgba(61, 220, 132, 0.3); }
.btn-sm { padding: 9px 20px; font-size: 0.88rem; }
.btn-ghost { background: transparent; color: var(--text); border: 1px solid var(--border-strong); }
.btn-ghost:hover { background: var(--accent-soft); box-shadow: none; }

/* ===== Nav ===== */
.nav {
  position: sticky; top: 0; z-index: 50;
  backdrop-filter: blur(14px);
  background: rgba(5, 8, 10, 0.6);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s, background 0.3s;
}
.nav.scrolled { border-bottom-color: var(--border); background: rgba(5, 8, 10, 0.85); }
.nav-inner { max-width: var(--maxw); margin: 0 auto; padding: 17px 24px; display: flex; align-items: center; gap: 32px; }
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; color: var(--text); }
.brand-mark {
  width: 20px; height: 20px; border-radius: 6px;
  background: var(--grad); box-shadow: 0 0 14px rgba(61, 220, 132, 0.5); position: relative;
}
.brand-mark::after { content: ''; position: absolute; inset: 5px; border-radius: 3px; background: var(--bg); }
.brand-name { font-weight: 700; font-size: 1.18rem; letter-spacing: -0.03em; }
.nav-links { display: flex; gap: 28px; margin-left: auto; }
.nav-links a { color: var(--text-dim); text-decoration: none; font-size: 0.92rem; font-weight: 500; transition: color 0.2s; }
.nav-links a:hover { color: var(--text); }

/* ===== Hero ===== */
.hero { padding: 130px 0 96px; text-align: center; }
.hero-inner { display: flex; flex-direction: column; align-items: center; }
.badge {
  display: inline-flex; align-items: center; gap: 9px;
  padding: 7px 16px; border: 1px solid var(--border); border-radius: 100px;
  font-size: 0.84rem; color: var(--text-dim); background: var(--bg-card);
  margin-bottom: 30px;
}
.pulse { width: 8px; height: 8px; border-radius: 50%; background: var(--accent); box-shadow: 0 0 0 0 rgba(61,220,132,0.6); animation: pulse 2s infinite; }
@keyframes pulse { 0% { box-shadow: 0 0 0 0 rgba(61,220,132,0.6);} 70% { box-shadow: 0 0 0 9px rgba(61,220,132,0);} 100% { box-shadow: 0 0 0 0 rgba(61,220,132,0);} }
h1 {
  font-size: clamp(2.6rem, 6vw, 4.6rem); line-height: 1.06;
  letter-spacing: -0.04em; font-weight: 700; max-width: 18ch; margin-bottom: 24px;
}
.grad { background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; }
.hero-sub { font-size: clamp(1.05rem, 2vw, 1.25rem); color: var(--text-dim); max-width: 58ch; margin-bottom: 36px; line-height: 1.6; }
.hero-sub strong { color: var(--text); font-weight: 600; }
.hero-cta { display: flex; gap: 14px; flex-wrap: wrap; justify-content: center; margin-bottom: 60px; }
.hero-trust { display: flex; flex-direction: column; align-items: center; gap: 16px; }
.hero-trust > span { font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.16em; color: var(--text-mute); }
.logos { display: flex; gap: 36px; flex-wrap: wrap; justify-content: center; }
.logos span { font-weight: 600; color: var(--text-mute); font-size: 1.02rem; opacity: 0.65; transition: opacity 0.2s, color 0.2s; }
.logos span:hover { opacity: 1; color: var(--text-dim); }

/* ===== Stats ===== */
.stats { padding: 24px 0 80px; }
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); padding: 48px 0; }
.stat { text-align: center; display: flex; flex-direction: column; gap: 6px; }
.stat-num { font-size: clamp(2.2rem, 4vw, 3.2rem); font-weight: 700; letter-spacing: -0.03em; background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; }
.stat-label { color: var(--text-dim); font-size: 0.92rem; }

/* ===== Sections ===== */
.section { padding: 100px 0; }
.section-alt { background: linear-gradient(180deg, transparent, rgba(10, 15, 16, 0.55), transparent); }
.section-head { max-width: 660px; margin: 0 auto 60px; text-align: center; }
.eyebrow { font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.18em; color: var(--accent); font-weight: 600; }
.section-head h2 { font-size: clamp(2rem, 4vw, 3rem); font-weight: 700; letter-spacing: -0.03em; margin: 16px 0 14px; line-height: 1.12; }
.section-head p { color: var(--text-dim); font-size: 1.08rem; }

/* ===== Cards ===== */
.cards { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.cards-3 { grid-template-columns: repeat(3, 1fr); }
.card { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--r); padding: 30px 26px; transition: transform 0.3s, border-color 0.3s, background 0.3s; }
.card:hover { transform: translateY(-4px); border-color: var(--border-strong); background: var(--accent-soft); }
.card-icon { width: 46px; height: 46px; display: grid; place-items: center; border-radius: 12px; background: var(--accent-soft); border: 1px solid var(--border); color: var(--accent); font-size: 1.35rem; margin-bottom: 18px; }
.card h3 { font-size: 1.16rem; font-weight: 600; margin-bottom: 10px; letter-spacing: -0.02em; }
.card p { color: var(--text-dim); font-size: 0.95rem; }

/* ===== Pipeline ===== */
.pipeline { list-style: none; max-width: 760px; margin: 0 auto; position: relative; }
.pipeline::before { content: ''; position: absolute; left: 27px; top: 12px; bottom: 12px; width: 2px; background: linear-gradient(180deg, var(--accent), var(--accent-2), transparent); opacity: 0.4; }
.pipeline li { display: flex; gap: 24px; align-items: flex-start; padding: 18px 0; position: relative; }
.step-no { flex-shrink: 0; width: 56px; height: 56px; display: grid; place-items: center; border-radius: 50%; background: var(--bg-soft); border: 1px solid var(--border-strong); font-weight: 600; color: var(--accent); z-index: 1; }
.pipeline h3 { font-size: 1.16rem; font-weight: 600; margin-bottom: 4px; letter-spacing: -0.02em; }
.pipeline p { color: var(--text-dim); font-size: 0.96rem; }

/* ===== Stack ===== */
.stack-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }
.stack-card { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--r); padding: 32px; position: relative; overflow: hidden; transition: border-color 0.3s; }
.stack-card::before { content: ''; position: absolute; top: 0; left: 0; width: 100%; height: 3px; background: var(--grad); transform: scaleX(0); transform-origin: left; transition: transform 0.4s ease; }
.stack-card:hover { border-color: var(--border-strong); }
.stack-card:hover::before { transform: scaleX(1); }
.stack-card h3 { font-size: 1.28rem; font-weight: 600; margin-bottom: 12px; letter-spacing: -0.02em; }
.stack-card p { color: var(--text-dim); margin-bottom: 18px; }
.stack-card code { font-family: 'JetBrains Mono', monospace; font-size: 0.82rem; color: var(--accent); background: var(--accent-soft); padding: 6px 12px; border-radius: 8px; display: inline-block; }

/* ===== FAQ ===== */
.faq { display: flex; flex-direction: column; gap: 12px; }
.faq details { background: var(--bg-card); border: 1px solid var(--border); border-radius: 12px; padding: 4px 22px; transition: border-color 0.3s; }
.faq details[open] { border-color: var(--border-strong); }
.faq summary { cursor: pointer; padding: 18px 0; font-weight: 600; font-size: 1.04rem; list-style: none; display: flex; justify-content: space-between; align-items: center; letter-spacing: -0.01em; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: '+'; color: var(--accent); font-size: 1.5rem; font-weight: 300; transition: transform 0.3s; }
.faq details[open] summary::after { transform: rotate(45deg); }
.faq details p { color: var(--text-dim); padding-bottom: 20px; }

/* ===== CTA ===== */
.cta { padding: 110px 0; }
.cta-inner { text-align: center; max-width: 720px; margin: 0 auto; background: radial-gradient(ellipse at 50% 0%, rgba(61, 220, 132, 0.12), transparent 70%), var(--bg-card); border: 1px solid var(--border); border-radius: 28px; padding: 66px 40px; }
.cta h2 { font-size: clamp(2rem, 4vw, 2.8rem); letter-spacing: -0.03em; margin-bottom: 16px; }
.cta p { color: var(--text-dim); font-size: 1.08rem; margin-bottom: 30px; }
.cta-form { display: flex; gap: 12px; max-width: 460px; margin: 0 auto; flex-wrap: wrap; justify-content: center; }
.cta-form input { flex: 1; min-width: 220px; padding: 13px 18px; border-radius: 100px; border: 1px solid var(--border-strong); background: rgba(0,0,0,0.3); color: var(--text); font-size: 0.95rem; font-family: inherit; }
.cta-form input:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px rgba(61,220,132,0.15); }
.cta-form input::placeholder { color: var(--text-mute); }
.cta-note { margin-top: 18px; color: var(--accent); font-size: 0.95rem; }
.cta-err { color: #ff8585; }

/* ===== Footer ===== */
.footer { border-top: 1px solid var(--border); padding: 64px 0 32px; }
.footer-inner { display: flex; justify-content: space-between; gap: 48px; flex-wrap: wrap; margin-bottom: 48px; }
.footer-brand { max-width: 280px; }
.footer-brand p { color: var(--text-dim); margin-top: 14px; font-size: 0.95rem; }
.footer-links { display: flex; gap: 56px; flex-wrap: wrap; }
.footer-links h4 { font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.12em; color: var(--text-mute); margin-bottom: 14px; }
.footer-links a { display: block; color: var(--text-dim); text-decoration: none; font-size: 0.95rem; margin-bottom: 9px; transition: color 0.2s; }
.footer-links a:hover { color: var(--accent); }
.footer-bottom { display: flex; justify-content: space-between; padding-top: 28px; border-top: 1px solid var(--border); color: var(--text-mute); font-size: 0.85rem; flex-wrap: wrap; gap: 10px; }

/* ===== Reveal ===== */
.reveal { opacity: 0; transform: translateY(22px); transition: opacity 0.7s ease, transform 0.7s ease; }
.reveal.in { opacity: 1; transform: none; }

/* ===== Responsive ===== */
@media (max-width: 900px) {
  .nav-links { display: none; }
  .cards, .cards-3, .stack-grid { grid-template-columns: 1fr 1fr; }
  .stats-grid { grid-template-columns: 1fr 1fr; gap: 32px 20px; }
}
@media (max-width: 600px) {
  .cards, .cards-3, .stack-grid { grid-template-columns: 1fr; }
  .hero { padding: 90px 0 64px; }
  .section { padding: 72px 0; }
  .logos { gap: 20px; }
  .pipeline li { gap: 16px; }
}
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  html { scroll-behavior: auto; }
  .pulse { animation: none; }
}