:root {
  --bg: #020617;
  --bg-alt: #000d15;
  --surface: #021018;
  --surface-alt: #04141f;
  --primary: #0099cc;
  --primary-soft: rgba(0, 153, 204, 0.22);
  --accent: #14b8a6;
  --accent-blue: #38bdf8;
  --text: #f1f5f9;
  --muted: #94a3b8;
  --border: rgba(148, 163, 184, 0.35);

  --radius-lg: 1.5rem;
  --radius-xl: 2rem;
  --shadow-soft: 0 18px 45px rgba(15, 23, 42, 0.9);
  --max-w: 1120px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "SF Pro Text",
    "Segoe UI", sans-serif;
  background: radial-gradient(circle at top, #03202f 0, #020617 45%, #000 100%);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

.page {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* NAVBAR */

.navbar {
  position: sticky;
  top: 0;
  z-index: 40;
  backdrop-filter: blur(22px);
  background: rgba(2,10,18,0.88);
  border-bottom: 1px solid rgba(148,163,184,0.25);
}

.navbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 0;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.7rem;
}

.brand-mark {
  width: 36px;
  height: 36px;
  border-radius: 999px;
  background:
    radial-gradient(circle at 15% 15%, #14b8a6, transparent 45%),
    radial-gradient(circle at 90% 90%, #38bdf8, transparent 60%),
    radial-gradient(circle at 50% 100%, #0f172a, transparent 55%);
  border: 1px solid rgba(148,163,184,0.7);
}

.brand-title {
  font-size: 0.86rem;
  font-weight: 650;
  letter-spacing: 0.22em;
  text-transform: uppercase;
}

.brand-sub {
  font-size: 0.72rem;
  color: var(--muted);
}

.nav-links {
  display: none;
  gap: 1.6rem;
  font-size: 0.9rem;
  align-items: center;
}

.nav-links a {
  position: relative;
  color: var(--muted);
}

.nav-links a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -0.15rem;
  height: 2px;
  width: 0;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  transition: 0.18s ease-out;
}

.nav-links a:hover {
  color: var(--text);
}

.nav-links a:hover::after {
  width: 100%;
}

.nav-cta {
  padding: 0.45rem 0.9rem;
  border-radius: 999px;
  border: 1px solid rgba(148,163,184,0.7);
  background: var(--primary-soft);
  font-size: 0.8rem;
}

.nav-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid rgba(148,163,184,0.6);
  border-radius: 999px;
  padding: 0.35rem 0.6rem;
  background: rgba(15,23,42,0.95);
  cursor: pointer;
  color: var(--text);
}

.hamburger-icon {
  width: 18px;
  height: 12px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  align-items: center;
}

.hamburger-icon span {
  width: 18px;
  height: 2px;
  background: white;
  border-radius: 6px;
  display: block;
}

.nav-links-mobile { 
  display: none; 
  flex-direction: column; 
  gap: 0.8rem; 
  padding: 1rem 0; 
  border-top: 1px solid rgba(148,163,184,0.2);
  margin-top: 0.5rem;
}
.nav-links-mobile.open { 
  display: flex; 
}
.nav-links-mobile a {
  color: var(--muted);
  padding: 0.6rem 0;
  transition: color 0.18s ease-out;
  font-size: 0.9rem;
}
.nav-links-mobile a:hover {
  color: var(--text);
}
.nav-links-mobile a:last-child {
  padding: 0.45rem 0.9rem;
  border-radius: 999px;
  border: 1px solid rgba(148,163,184,0.7);
  background: var(--primary-soft);
  font-size: 0.8rem;
  display: inline-block;
  width: fit-content;
}

/* HERO */

.hero {
  padding: 3.4rem 0 3.2rem;
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr);
  gap: 2.4rem;
  align-items: center;
}

.hero-kicker {
  font-size: 0.72rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--muted);
  display: flex;
  gap: 0.5rem;
  margin-bottom: 1rem;
}

.hero-title {
  font-size: clamp(2.3rem, 4.4vw, 3.3rem);
  line-height: 1.05;
  font-weight: 670;
  margin-bottom: 0.8rem;
}

.hero-title span {
  background-image: linear-gradient(120deg, #38bdf8, #14b8a6, #0099cc);
  -webkit-background-clip: text;
  color: transparent;
}

.hero-sub {
  font-size: 1rem;
  color: var(--muted);
  max-width: 34rem;
  margin-bottom: 1.6rem;
}

.hero-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-bottom: 1.7rem;
}

.badge {
  border: 1px solid rgba(148,163,184,0.5);
  padding: 0.35rem 0.8rem;
  border-radius: 999px;
  background: rgba(15,23,42,0.9);
  font-size: 0.72rem;
  color: var(--muted);
}

.btn {
  padding: 0.85rem 1.5rem;
  border-radius: 999px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  transition: 0.18s ease-out;
  font-size: 0.88rem;
  font-weight: 500;
  border: none;
}

.btn-primary {
  background: linear-gradient(115deg, #14b8a6, #0099cc);
  color: #020617;
  box-shadow: var(--shadow-soft);
}

.btn-primary:hover { transform: translateY(-1px); }

.btn-outline {
  border: 1px solid rgba(148,163,184,0.6);
  background: rgba(15,23,42,0.94);
  color: var(--text);
}

.hero-visual {
  border-radius: var(--radius-xl);
  padding: 1px;
  background:
    radial-gradient(circle at 0 0, var(--primary), transparent 60%),
    radial-gradient(circle at 90% 90%, var(--accent-blue), transparent 70%);
  box-shadow: var(--shadow-soft);
}

.hero-visual-inner {
  border-radius: inherit;
  padding: 1.4rem;
  background:
    radial-gradient(circle at top, rgba(15,23,42,0.5), transparent 60%),
    linear-gradient(150deg, #020617, #020617);
  border: 1px solid rgba(148,163,184,0.25);
  position: relative;
  overflow: hidden;
}

.ecos-label {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.72rem;
  padding: 0.35rem 0.75rem;
  border-radius: 999px;
  border: 1px solid rgba(148,163,184,0.6);
  background: rgba(2,6,23,0.96);
  color: var(--muted);
}

.ecos-grid {
  margin-top: 1.1rem;
  display: grid;
  gap: 0.7rem;
}

.ecos-chip {
  border-radius: 999px;
  border: 1px solid rgba(148,163,184,0.5);
  padding: 0.55rem 0.85rem;
  background: radial-gradient(circle at left, rgba(0,153,204,0.22), rgba(15,23,42,0.96));
  display: flex;
  justify-content: space-between;
  font-size: 0.78rem;
  color: var(--muted);
}

.chip-main { font-size: 0.82rem; color: var(--text); font-weight: 500; }
.chip-badge { border: 1px solid rgba(148,163,184,0.45); border-radius: 999px; padding: 0.16rem 0.6rem; font-size: 0.7rem; }

/* SECTION LAYOUT */
section { padding: 3rem 0; }
.section-header { max-width: 40rem; margin-bottom: 1.8rem; }
.section-kicker { font-size: 0.72rem; letter-spacing: 0.22em; text-transform: uppercase; color: var(--muted); margin-bottom: 0.45rem; }
.section-title { font-size: 1.4rem; margin-bottom: 0.5rem; }
.section-desc { color: var(--muted); font-size: 0.9rem; }

/* STACK CARDS */

.stack-card {
  border-radius: var(--radius-xl);
  background: radial-gradient(circle at top, rgba(0,153,204,0.16), rgba(2,6,23,1));
  padding: 1.4rem 1.3rem 1.6rem;
  border: 1px solid var(--border);
  box-shadow: var(--shadow-soft);
}

.stack-grid {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 0.9rem;
}

.stack-tile {
  border-radius: 1rem;
  padding: 0.8rem 0.9rem;
  border: 1px solid rgba(148,163,184,0.6);
  background: radial-gradient(circle at top left, rgba(20,184,166,0.3), rgba(2,6,23,0.98));
  font-size: 0.8rem;
}

.stack-title { font-size: 0.88rem; margin-bottom: 0.3rem; }
.stack-label { font-size: 0.7rem; color: var(--muted); text-transform: uppercase; margin-bottom: 0.2rem; }

/* USE CASES */

.card-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1.1rem;
}

.card {
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  background: linear-gradient(145deg, var(--surface-alt), var(--surface));
  padding: 1rem;
  font-size: 0.85rem;
}

.card-tag { text-transform: uppercase; font-size: 0.7rem; color: var(--muted); margin-bottom: 0.2rem; }
.card-title { font-size: 0.9rem; margin-bottom: 0.4rem; }
.card-list { padding-left: 1.2rem; margin-top: 0.5rem; }
.card-list li { font-size: 0.8rem; color: var(--muted); margin-bottom: 1.0rem; line-height: 1.5; }

/* CTA */

.cta {
  padding: 1.6rem 1.4rem;
  background: radial-gradient(circle at top, rgba(20,184,166,0.2), rgba(2,6,23,0.98));
  border-radius: var(--radius-xl);
  border: 1px solid rgba(148,163,184,0.65);
  text-align: center;
  box-shadow: var(--shadow-soft);
}

.cta-title { font-size: 1.35rem; margin-bottom: 0.45rem; }
.cta-text { font-size: 0.9rem; color: var(--muted); margin-bottom: 1rem; }

/* FOOTER */
.footer { border-top: 1px solid rgba(148,163,184,0.3); padding: 1.8rem 0 1.4rem; font-size: 0.78rem; color: var(--muted); }

/* RESPONSIVE */

@media (max-width: 900px) {
  .hero-grid { grid-template-columns: 1fr; }
  .stack-grid { grid-template-columns: repeat(3,1fr); }
  .card-grid { grid-template-columns: repeat(2,1fr); }
}

@media (max-width: 720px) {
  .stack-grid { grid-template-columns: repeat(2,1fr); }
  .card-grid { grid-template-columns: 1fr; }
}