:root {
  --bg-header: #003554;
  --bg-home: linear-gradient(180deg, #003554 0%, #006494 100%);
  --bg-about: #005e95;
  --bg-portofolio: #006494;
  --bg-contact: #111111;
  --bg-footer: linear-gradient(0deg, #003554 0%, #006494 100%);
  --bg-primary: #001f3f;
  --text-primary: #ffffff;
  --text-secondary: #a0a0a0;
  --accent: #00a6fb;
  --transition: all 0.3s ease;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  line-height: 1.6;
}

/* Navigation */
nav {
  position: fixed;
  top: 0;
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.5rem 5%;
  background-color: var(--bg-header);
  backdrop-filter: blur(10px);
  z-index: 1000;
  border-bottom: var(--bg-header);
}

.logo {
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: 2px;
}

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

.lang-switcher {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.95rem;
}

.lang-link {
  color: var(--text-primary);
  text-decoration: none;
  padding: 0.3rem 0.6rem;
  border-radius: 4px;
  font-weight: 600;
  position: relative;
  transition: var(--transition);
}

.lang-link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  height: 2px;
  width: 0%;
  background: var(--accent);
  transition: var(--transition);
}

.lang-link:hover::after,
.lang-link.active::after {
  width: 100%;
}

.lang-link.active {
  color: var(--accent);
  background-color: rgba(255, 255, 255, 0.05);
}


.nav-links a {
  color: var(--text-primary);
  text-decoration: none;
  font-size: 1rem;
  padding: 0.5rem 0;
  transition: var(--transition);
  position: relative;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -5px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent);
  transition: var(--transition);
}

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

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

/* HOME Section */
.hero {
  height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  padding: 0 5%;
  background: var(--bg-home);
}

.hero h1 {
  font-size: 4rem;
  font-weight: 700;
  margin-bottom: 1rem;
  opacity: 0;
  transform: translateY(20px);
  animation: fadeInUp 0.8s forwards;
}

.subtitle {
  font-size: 1.5rem;
  color: var(--text-secondary);
  margin-bottom: 2rem;
  opacity: 0;
  transform: translateY(20px);
  animation: fadeInUp 0.8s 0.2s forwards;
}

.cta-button {
  display: inline-block;
  padding: 1rem 2rem;
  background: transparent;
  border: 2px solid var(--accent);
  color: var(--accent);
  text-decoration: none;
  border-radius: 5px;
  font-weight: 600;
  transition: var(--transition);
  opacity: 0;
  transform: translateY(20px);
  animation: fadeInUp 0.8s 0.4s forwards;
  box-shadow: 0 4px 8px rgba(0, 166, 251, 0.2);
}

.cta-button:hover {
  background: var(--accent);
  color: var(--bg-primary);
}

/* About Section */
.about {
  padding: 8rem 5%;
  background: var(--bg-about);
}

.about h2 {
  text-align: center;
  font-size: 2.5rem;
  margin-bottom: 4rem;
  position: relative;
  display: inline-block;
}

.about h2::after {
  content: '';
  position: absolute;
  width: 60%;
  height: 3px;
  bottom: -10px;
  left: 20%;
  background: var(--accent);
  border-radius: 5px;
}

.about-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2rem;
}

.about-card {
  padding: 2rem;
  background: rgba(255, 255, 255, 0.05);
  border-radius: 10px;
  text-align: center;
  transition: var(--transition);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
  opacity: 0;
  transform: translateY(30px);
  animation: fadeInCard 0.6s ease forwards;
}

.about-card:hover {
  transform: translateY(-8px) scale(1.02);
  background: rgba(255, 255, 255, 0.1);
}

.about-card:nth-child(1) {
  animation-delay: 0.1s;
}
.about-card:nth-child(2) {
  animation-delay: 0.3s;
}
.about-card:nth-child(3) {
  animation-delay: 0.5s;
}
.about-card:nth-child(4) {
  animation-delay: 0.7s;
}

.about-card i {
  font-size: 2.5rem;
  color: var(--accent);
  margin-bottom: 1.5rem;
}

.about-card h3 {
  margin-bottom: 1rem;
}

/* Portfolio Section */
.portfolio {
  padding: 8rem 5%;
  background: var(--bg-portofolio);
}

.portfolio h2 {
  text-align: center;
  font-size: 2.5rem;
  margin-bottom: 4rem;
  position: relative;
  display: inline-block;
}

.portfolio h2::after {
  content: '';
  position: absolute;
  width: 60%;
  height: 3px;
  bottom: -10px;
  left: 20%;
  background: var(--accent);
  border-radius: 5px;
}

.portfolio-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
}

.portfolio-item {
  position: relative;
  height: 300px;
  background: rgba(235, 232, 232, 0.05);
  border-radius: 10px;
  overflow: hidden;
  cursor: pointer;
}

.portfolio-content {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 2rem;
  background: linear-gradient(transparent, rgba(185, 185, 185, 0.9));
  transform: translateY(100%);
  transition: var(--transition);
}

.portfolio-item:hover .portfolio-content {
  transform: translateY(0);
}

/* Contact Section */
.contact {
  padding: 8rem 5%;
  background: var(--bg-contact);
}

.contact h2 {
  text-align: center;
  font-size: 2.5rem;
  margin-bottom: 4rem;
  position: relative;
  display: inline-block;
}

.contact h2::after {
  content: '';
  position: absolute;
  width: 60%;
  height: 3px;
  bottom: -10px;
  left: 20%;
  background: var(--accent);
  border-radius: 5px;
}

.contact-container {
  max-width: 800px;
  margin: 0 auto;
}

.contact-info {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 2rem;
}

.contact-item {
  text-align: center;
}

.contact-item i {
  font-size: 2rem;
  color: var(--accent);
  margin-bottom: 1rem;
}

/* Footer */
footer {
  background: var(--bg-footer);
  padding: 4rem 5% 2rem;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 3rem;
  margin-bottom: 3rem;
}

.footer-section h4 {
  color: var(--accent);
  margin-bottom: 1.5rem;
}

.social-links {
  display: flex;
  gap: 1rem;
}

.social-links a {
  color: var(--text-secondary);
  font-size: 1.5rem;
  transition: var(--transition);
}

.social-links a:hover {
  color: var(--accent);
}

.footer-bottom {
  text-align: center;
  padding-top: 2rem;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

/* Animations */
@keyframes fadeInUp {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeInCard {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Responsive Design */
@media (max-width: 768px) {
  nav {
    flex-direction: column;
    padding: 1rem;
  }

  .nav-links {
    margin-top: 1rem;
    gap: 1rem;
  }

  .hero h1 {
    font-size: 2.5rem;
  }

  .subtitle {
    font-size: 1.2rem;
  }

  .about,
  .portfolio,
  .contact {
    padding: 4rem 5%;
  }

  .footer-content {
    grid-template-columns: 1fr;
    text-align: center;
  }
}