/* Reset dan Base Styling */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  /* Color Palette */
  --primary-color: #6366f1;
  --primary-dark: #4f46e5;
  --secondary-color: #06b6d4;
  --accent-color: #f59e0b;
  --background-dark: #0f172a;
  --background-darker: #020617;
  --surface-dark: #1e293b;
  --text-primary: #f8fafc;
  --text-secondary: #cbd5e1;
  --text-muted: #94a3b8;
  --glass-bg: rgba(255, 255, 255, 0.05);
  --glass-border: rgba(255, 255, 255, 0.1);

  /* Gradients */
  --gradient-primary: linear-gradient(
    135deg,
    var(--primary-color),
    var(--secondary-color)
  );

  /* Shadows */
  --shadow-soft: 0 4px 20px rgba(0, 0, 0, 0.15);
  --shadow-medium: 0 8px 30px rgba(0, 0, 0, 0.2);

  /* Typography */
  --font-primary: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI",
    sans-serif;
  --font-display: "Space Grotesk", -apple-system, BlinkMacSystemFont, "Segoe UI",
    sans-serif;

  /* Spacing */
  --container-padding: 2rem;
  --section-padding: 6rem 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-primary);
  background: var(--gradient-primary);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  min-height: 100vh;
}

/* Animated Background */
.bg-animation {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: radial-gradient(
      circle at 20% 30%,
      rgba(99, 102, 241, 0.1) 0%,
      transparent 50%
    ),
    radial-gradient(
      circle at 80% 70%,
      rgba(6, 182, 212, 0.1) 0%,
      transparent 50%
    );
  animation: backgroundMove 20s ease-in-out infinite;
  z-index: -2;
}

@keyframes backgroundMove {
  0%,
  100% {
    transform: translate(0, 0) rotate(0deg);
  }
  33% {
    transform: translate(-20px, -10px) rotate(1deg);
  }
  66% {
    transform: translate(20px, 10px) rotate(-1deg);
  }
}

/* Floating Elements */
.floating-elements {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: -1;
}

.floating-element {
  position: absolute;
  width: 4px;
  height: 4px;
  background: var(--primary-color);
  border-radius: 50%;
  opacity: 0.6;
  animation: float 15s infinite linear;
}

.floating-element:nth-child(1) {
  left: 10%;
  animation-delay: 0s;
  animation-duration: 20s;
}
.floating-element:nth-child(2) {
  left: 30%;
  animation-delay: -5s;
  animation-duration: 25s;
}
.floating-element:nth-child(3) {
  left: 50%;
  animation-delay: -10s;
  animation-duration: 18s;
}
.floating-element:nth-child(4) {
  left: 70%;
  animation-delay: -15s;
  animation-duration: 22s;
}
.floating-element:nth-child(5) {
  left: 90%;
  animation-delay: -20s;
  animation-duration: 28s;
}

@keyframes float {
  0% {
    transform: translateY(100vh) rotate(0deg);
    opacity: 0;
  }
  10% {
    opacity: 0.6;
  }
  90% {
    opacity: 0.6;
  }
  100% {
    transform: translateY(-100px) rotate(360deg);
    opacity: 0;
  }
}

/* Container */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--container-padding);
}

/* Header */
header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: rgba(15, 23, 42, 0.8);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--glass-border);
  z-index: 1000;
  transition: all 0.3s ease;
}

.header-content {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--container-padding);
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 80px;
}

.logo h1 {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
}

.logo-text {
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent; /* Menggantikan -webkit-text-fill-color */
}

.logo-dot {
  color: var(--accent-color);
}

/* Navigation */
nav ul {
  display: flex;
  list-style: none;
  gap: 2rem;
}

.nav-link {
  color: var(--text-secondary);
  text-decoration: none;
  padding: 0.5rem 1rem;
  border-radius: 8px;
  transition: all 0.3s ease;
  position: relative; /* Untuk posisi pseudo-element */
}

.nav-link:hover,
.nav-link.active {
  color: var(--text-primary);
  background: var(--glass-bg);
  transform: translateY(-2px);
}

.nav-link.active::after {
  content: "";
  position: absolute;
  bottom: -10px;
  left: 50%;
  transform: translateX(-50%);
  width: 4px;
  height: 4px;
  background: var(--primary-color);
  border-radius: 50%;
}

/* Mobile Menu Toggle */
.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 4px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}

.menu-toggle span {
  width: 25px;
  height: 3px;
  background: var(--text-primary);
  transition: all 0.3s ease;
  transform-origin: center;
}

/* Main Content */
main {
  margin-top: 80px;
}

/* Section Styling */
section {
  padding: var(--section-padding);
  max-width: 1200px;
  margin: 0 auto;
  padding-left: var(--container-padding);
  padding-right: var(--container-padding);
}

.section-header {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 4rem;
}

.section-number {
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--primary-color);
  background: var(--glass-bg);
  padding: 0.5rem 1rem;
  border-radius: 20px;
  border: 1px solid var(--glass-border);
}

.section-header h2 {
  font-family: var(--font-display);
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--text-primary);
}

.section-line {
  flex: 1;
  height: 2px;
  background: var(--gradient-primary);
  border-radius: 1px;
}

/* Activity Content */
.activity-content {
  background: var(--surface-dark);
  border: 1px solid var(--glass-border);
  border-radius: 16px;
  padding: 2rem;
  max-width: 800px;
  margin: 0 auto;
  box-shadow: var(--shadow-medium);
}

.activity-type {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--primary-color);
  font-weight: 600;
  margin-bottom: 1rem;
  font-size: 0.9rem;
}

.activity-content h3 {
  font-family: var(--font-display);
  font-size: 1.5rem;
  color: var(--text-primary);
  margin-bottom: 1rem;
}

.activity-content p {
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 1.5rem;
}

.activity-details {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-bottom: 1.5rem;
}

.activity-details i {
  color: var(--primary-color);
  margin-right: 0.5rem; /* Penambahan jarak ikon dengan teks */
}

/* PDF Embed */
.pdf-embed {
  width: 100%;
  height: 600px;
  border: none;
  border-radius: 12px;
  margin-top: 2rem;
  box-shadow: var(--shadow-medium);
}

/* Download Button */
.download-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 1rem 2rem;
  border-radius: 12px;
  text-decoration: none;
  font-weight: 600;
  font-size: 1rem;
  background: transparent;
  color: var(--text-primary);
  border: 2px solid var(--primary-color);
  transition: all 0.3s ease;
  margin-top: 1rem;
}

.download-btn:hover {
  background: var(--gradient-primary);
  color: white;
  transform: translateY(-3px);
  box-shadow: var(--shadow-medium);
}

/* Footer */
footer {
  background: var(--background-darker);
  border-top: 1px solid var(--glass-border);
  padding: 3rem 0;
  margin-top: 4rem;
}

.footer-content {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--container-padding);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 2rem;
}

.footer-text p {
  color: var(--text-secondary);
  margin-bottom: 0.5rem;
}

.footer-subtitle {
  color: var(--text-muted);
  font-size: 0.9rem;
}

.footer-links {
  display: flex;
  gap: 2rem;
}

.footer-link {
  color: var(--text-secondary);
  text-decoration: none;
  transition: color 0.3s ease;
}

.footer-link:hover {
  color: var(--primary-color);
}

/* Back to Top Button */
.back-to-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 50px;
  height: 50px;
  background: var(--gradient-primary);
  border: none;
  border-radius: 50%;
  color: white;
  font-size: 1.2rem;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s ease;
  z-index: 1000;
  box-shadow: var(--shadow-medium);
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
}

.back-to-top:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-medium);
}

/* Animation Classes */
.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: all 0.6s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Scrollbar Styling */
::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-track {
  background: var(--background-darker);
}

::-webkit-scrollbar-thumb {
  background: var(--primary-color);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--primary-dark);
}

/* Selection Styling */
::selection {
  background: var(--primary-color);
  color: white;
}

/* Focus Styles */
.nav-link:focus,
.download-btn:focus {
  outline: 2px solid var(--primary-color);
  outline-offset: 2px;
}

/* Responsive Design */
@media (max-width: 1024px) {
  :root {
    --container-padding: 1.5rem;
    --section-padding: 4rem 0;
  }
}

@media (max-width: 768px) {
  .menu-toggle {
    display: flex;
    z-index: 1001;
  }

  nav {
    position: fixed;
    top: 80px;
    left: 0;
    right: 0;
    background: rgba(15, 23, 42, 0.95);
    backdrop-filter: blur(20px);
    transform: translateY(-100%);
    transition: transform 0.3s ease;
    border-bottom: 1px solid var(--glass-border);
  }

  nav.active {
    transform: translateY(0);
  }

  nav ul {
    flex-direction: column;
    padding: 2rem;
    gap: 1rem;
  }

  .nav-link {
    justify-content: center;
    padding: 1rem;
    border-radius: 12px;
    background: var(--glass-bg);
  }

  .pdf-embed {
    height: 400px;
  }

  .section-header h2 {
    font-size: 2rem;
  }

  .section-line {
    width: 100%;
  }
}

@media (max-width: 480px) {
  :root {
    --container-padding: 1rem;
  }

  .activity-content {
    padding: 1.5rem;
  }

  .download-btn {
    padding: 0.8rem 1.5rem;
    font-size: 0.9rem;
  }
}

/* Vendor Prefixes untuk Kompatibilitas */
@-moz-document url-prefix() {
  .logo-text {
    color: var(--primary-color); /* Firefox fallback */
  }
}

@supports (-webkit-backdrop-filter: blur(1px)) or (backdrop-filter: blur(1px)) {
  header {
    -webkit-backdrop-filter: blur(20px);
    backdrop-filter: blur(20px);
  }

  nav {
    -webkit-backdrop-filter: blur(20px);
    backdrop-filter: blur(20px);
  }
}