:root {
  --primary: #0039C8;
  --secondary: #012583;
  --accent: #ACFF00;
  --light-blue: #5A89FE;
  --dark: #0a0a14;
  --shadow-glow: 0 0 20px #ACFF00;
  --shadow-glow-blue: 0 0 20px #2059E5;
  --font-main: "Outfit", sans-serif;
  
  --bg-main: #f9fafb;
  --bg-card: #ffffff;
  --text-main: #111827;
  --text-muted: #6b7280;
  --border-color: #e5e7eb;
  --accent-color: var(--primary);
  --accent-text: #ffffff;
  --secondary-text: var(--primary);
  --shadow-color: rgba(0, 0, 0, 0.05);
  --bg-navbar: rgba(255, 255, 255, 0.7);
  --icon-filter: invert(13%) sepia(98%) saturate(5500%) hue-rotate(220deg) brightness(97%) contrast(120%);
}

body.dark {
  --bg-main: var(--dark);
  --bg-card: var(--secondary);
  --text-main: #e0e4f0;
  --text-muted: #8b9ed9;
  --border-color: rgba(90, 137, 254, 0.2);
  --accent-color: var(--accent);
  --accent-text: var(--dark);
  --secondary-text: var(--accent);
  --shadow-color: rgba(0, 0, 0, 0.2);
  --bg-navbar: rgba(10, 10, 20, 0.7);
  --icon-filter: invert(89%) sepia(58%) saturate(3015%) hue-rotate(29deg) brightness(107%) contrast(105%);
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
html {
  scroll-behavior: smooth;
}
body {
  font-family: var(--font-main);
  background-color: var(--bg-main);
  color: var(--text-main);
  transition: background-color 0.3s ease, color 0.3s ease;
  overflow-x: hidden;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}
main {
  flex-grow: 1;
}
a {
  color: var(--primary); 
  text-decoration: none;
  transition: color 0.3s ease;
}
body.dark a {
  color: var(--accent);
}
a:hover {
  color: var(--light-blue);
}
body.dark a:hover {
  color: white;
}
img {
  max-width: 100%;
  height: auto;
}
.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 2rem;
}

.navbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 2rem;
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: var(--bg-navbar);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-color);
  transition: background-color 0.3s ease, border-color 0.3s ease;
}
.nav-logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}
.nav-logo .logo {
  width: 36px;
  height: 36px;
}
.nav-logo h1 {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--primary);
  transition: color 0.3s ease;
}
body.dark .nav-logo h1 {
  color: var(--accent);
}
.nav-links {
  display: flex;
  list-style: none;
  gap: 1.5rem;
}
.nav-links a {
  font-weight: 500;
  color: var(--text-muted);
  transition: color 0.3s ease, text-shadow 0.3s ease;
}
.nav-links a:hover {
  color: var(--primary);
}
body.dark .nav-links a:hover {
  color: var(--accent);
  text-shadow: 0 0 10px var(--accent);
}
.nav-links a.active {
  color: var(--text-main);
  font-weight: 700;
}
body.dark .nav-links a.active {
  color: white;
}
.btn-icon {
  background: none;
  border: none;
  color: var(--text-main);
  font-size: 1.5rem;
  cursor: pointer;
  transition: color 0.3s ease;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0.25rem;
}
.nav-controls {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.nav-toggle-btn {
  display: none; 
  font-size: 1.8rem;
}

.btn-primary,
.btn-secondary {
  padding: 0.8rem 2rem;
  font-family: var(--font-main);
  font-size: 1rem;
  font-weight: 700;
  border-radius: 8px;
  cursor: pointer;
  text-align: center;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease;
  border: 2px solid var(--accent-color);
}
.btn-primary {
  background-color: var(--accent-color);
  color: var(--accent-text);
  border-color: var(--accent-color);
}
.btn-primary:hover {
  transform: scale(1.05);
  box-shadow: var(--shadow-glow);
}
body:not(.dark) .btn-primary:hover {
  background-color: #002bad;
  border-color: #002bad;
}
.btn-secondary {
  background-color: transparent;
  color: var(--secondary-text);
  border-color: var(--secondary-text);
}
.btn-secondary:hover {
  background-color: var(--accent-color);
  color: var(--accent-text);
  border-color: var(--accent-color);
  transform: scale(1.05);
  box-shadow: var(--shadow-glow);
}
.btn-primary:active,
.btn-secondary:active {
  transform: scale(0.98);
}

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
}
.card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 1.5rem;
  text-align: left; 
  transition: transform 0.3s ease, box-shadow 0.3s ease, background-color 0.3s ease, border-color 0.3s ease;
  box-shadow: 0 4px 10px var(--shadow-color);
}
.card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 20px var(--shadow-color), var(--shadow-glow-blue);
}
.card img {
  width: 32px;
  height: 32px;
  margin-bottom: 1rem;
  filter: var(--icon-filter);
  transition: filter 0.3s ease;
}
.card h3 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 0.5rem;
}
.card p {
  color: var(--text-muted);
  line-height: 1.6;
}

.footer {
  margin-top: auto; 
  padding: 3rem 2rem;
  background-color: var(--bg-card);
  border-top: 1px solid var(--border-color);
  transition: background-color 0.3s ease, border-color 0.3s ease;
}
.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2rem;
  max-width: 1100px;
  margin: 0 auto;
}
.footer h4 {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 1rem;
  transition: color 0.3s ease;
}
body.dark .footer h4 {
  color: var(--accent);
}
.footer p {
  color: var(--text-muted);
  line-height: 1.6;
  transition: color 0.3s ease;
}
.footer a {
  color: var(--primary);
}
body.dark .footer a {
  color: var(--light-blue);
}
.footer a:hover {
  color: var(--accent);
  text-decoration: underline;
}
.copy {
  text-align: center;
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border-color);
  color: var(--text-muted);
  transition: border-color 0.3s ease, color 0.3s ease;
}

.hero {
  padding-top: 5rem;
  padding-bottom: 5rem;
  text-align: center;
  border-bottom: 1px solid var(--border-color);
}
.hero h2 {
  font-size: 3.2rem;
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 1rem;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}
body.dark .hero h2 {
  background: linear-gradient(90deg, var(--light-blue), var(--accent));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.hero p {
  font-size: 1.1rem;
  color: var(--text-muted);
  max-width: 600px;
  margin: 0 auto 2.5rem;
  line-height: 1.6;
}
.hero-actions {
  display: flex;
  justify-content: center;
  gap: 1rem;
}
#fitur {
  padding-top: 4rem;
  padding-bottom: 4rem;
}
#fitur .section-title {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 3rem;
  text-align: center;
}
body.dark #fitur .section-title {
  color: var(--accent);
}

.hidden {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}
.show {
  opacity: 1;
  transform: translateY(0);
}
.card.hidden:nth-child(1) { transition-delay: 100ms; }
.card.hidden:nth-child(2) { transition-delay: 200ms; }
.card.hidden:nth-child(3) { transition-delay: 300ms; }

@media (max-width: 768px) {
  .nav-links {
    display: none; 
    position: absolute;
    top: 100%;
    left: 0;
    width: 100%;
    background-color: var(--bg-card);
    flex-direction: column;
    padding: 1rem;
    border-bottom: 1px solid var(--border-color);
    box-shadow: 0 10px 20px var(--shadow-color);
  }
  .nav-links a {
    padding: 0.75rem 1rem;
    border-radius: 8px;
  }
  .nav-links a:hover {
    background-color: var(--bg-main);
  }
  .navbar.nav-open .nav-links {
    display: flex;
  }
  .nav-toggle-btn {
    display: flex; 
  }

  .container {
    padding: 1.5rem;
  }
  .hero {
    padding-top: 3rem;
    padding-bottom: 3rem;
  }
  .hero h2 {
    font-size: 2.2rem;
  }
  .hero-actions {
    flex-direction: column; 
    gap: 0.75rem;
  }
  .btn-primary, .btn-secondary {
    width: 100%;
  }
  #fitur .section-title {
    font-size: 2rem;
  }
  .cards {
    grid-template-columns: 1fr;
  }
}