/* ----------  VANTACORE.ID – monochrome modern  ---------- */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

:root {
  --bg: #000;
  --bg2: #111;
  --bg3: #1a1a1a;
  --fg: #ffffff;
  --fg2: #e5e5e5;
  --accent: #ffffff;   /* tetap putih untuk glow */
  --radius: 12px;
  --transition: .35s cubic-bezier(.4,0,.2,1);
}

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

html { scroll-behavior: smooth; }

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--bg);
  color: var(--fg);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* --- Navbar --- */
nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  background: rgba(0, 0, 0, 0.75);
  backdrop-filter: blur(10px);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: .8rem 1.2rem;
  z-index: 1000;
  animation: fadeDown .8s both;
}

nav .brand {
  font-weight: 700;
  font-size: clamp(1.1rem, 2.5vw, 1.4rem);
  letter-spacing: .05em;
}

nav a {
  color: var(--fg);
  margin-left: 1.2rem;
  text-decoration: none;
  font-weight: 500;
  transition: opacity var(--transition);
}

nav a:hover { opacity: .6; }

/* --- Hero --- */
header {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 5rem 1.2rem 3rem;
}

header h1 {
  font-size: clamp(2.2rem, 8vw, 4.5rem);
  font-weight: 700;
  line-height: 1.1;
  animation: glow 2s ease-in-out infinite alternate;
}

header p {
  font-size: clamp(.95rem, 2.5vw, 1.3rem);
  font-weight: 300;
  margin: .5rem 0 2rem;
  opacity: .8;
}

.btn {
  background: var(--fg);
  color: var(--bg);
  padding: .9rem 2.2rem;
  font-weight: 600;
  border: none;
  border-radius: 50px;
  cursor: pointer;
  transition: transform var(--transition), box-shadow var(--transition);
}

.btn:hover {
  transform: scale(1.05) translateY(-2px);
  box-shadow: 0 0 20px rgba(255, 255, 255, .25);
}

/* --- Sections --- */
section {
  max-width: 900px;
  margin: 0 auto;
  padding: 4.5rem 1.2rem;
  opacity: 0;
  transform: translateY(30px);
  transition: opacity .8s ease, transform .8s ease;
}

section.show { opacity: 1; transform: none; }

section h2 {
  font-size: clamp(1.5rem, 4vw, 2.2rem);
  font-weight: 600;
  margin-bottom: 1rem;
  position: relative;
}

section h2::after {
  content: '';
  width: 50px;
  height: 3px;
  background: var(--fg);
  display: block;
  margin: .5rem 0 1rem;
}

/* --- Grid / Cards --- */
.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.6rem;
  margin-top: 1.5rem;
}

.card {
  background: var(--bg2);
  border: 1px solid #222;
  border-radius: var(--radius);
  padding: 2rem;
  transition: transform var(--transition), box-shadow var(--transition);
}

.card:hover {
  transform: translateY(-8px);
  box-shadow: 0 0 25px rgba(255, 255, 255, .12);
}

.card h3 {
  font-weight: 600;
  margin-bottom: .4rem;
}

.card p {
  font-size: .95rem;
  opacity: .7;
}

/* --- Footer --- */
footer {
  text-align: center;
  padding: 2rem 1rem;
  font-size: .9rem;
  opacity: .55;
}

/* --- Animations --- */
@keyframes fadeDown {
  from { opacity: 0; transform: translateY(-20px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes glow {
  from { text-shadow: 0 0 6px var(--accent); }
  to   { text-shadow: 0 0 12px var(--accent), 0 0 24px var(--accent); }
}

/* --- Responsive tweaks --- */
@media (max-width: 600px) {
  nav { flex-direction: column; gap: .5rem; }
  header { padding-top: 6rem; }
}