/* Theme Variables */
:root {
  /* Common variables */
  --primary-color: #2dd4bf;
  --transition-default: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);

  /* Light theme (default) */
  --bg-color: #f3f4f6;
  --navbar-bg: rgba(17, 24, 39, 0.95);
  --text-primary: #111827;
  --text-secondary: #4b5563;
  --border-color: rgba(255, 255, 255, 0.1);
  --card-bg: rgba(255, 255, 255, 0.7);
  --card-hover: rgba(255, 255, 255, 0.8);
  --glass-effect-bg: rgba(255, 255, 255, 0.7);
  --nav-text: #f9fafb;
  --nav-hover: #ffffff;
}

/* Dark theme */
[data-theme="dark"] {
  --bg-color: #111827;
  --navbar-bg: rgba(17, 24, 39, 0.95);
  --text-primary: #f9fafb;
  --text-secondary: #9ca3af;
  --border-color: rgba(255, 255, 255, 0.1);
  --card-bg: rgba(31, 41, 55, 0.5);
  --card-hover: rgba(31, 41, 55, 0.7);
  --glass-effect-bg: rgba(31, 41, 55, 0.7);
  --nav-text: #9ca3af;
  --nav-hover: #f9fafb;
}

body {
  font-family: "Poppins", sans-serif;
  background-color: var(--bg-color);
  color: var(--text-primary);
  scroll-behavior: smooth;
  line-height: 1.7;
  transition: background-color 0.3s ease, color 0.3s ease;
}

/* Navigation */
.navbar {
  background: var(--navbar-bg);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-color);
}

.nav-link {
  position: relative;
  transition: var(--transition-default);
  padding: 0.75rem 1.25rem;
  font-weight: 500;
  color: var(--nav-text);
  font-size: 0.95rem;
  letter-spacing: 0.5px;
}

.nav-link::after {
  content: "";
  position: absolute;
  width: 4px;
  height: 4px;
  bottom: 0.5rem;
  left: 50%;
  background-color: var(--primary-color);
  transition: var(--transition-default);
  transform: translateX(-50%) scale(0);
  border-radius: 50%;
  opacity: 0;
}

.nav-link:hover::after {
  transform: translateX(-50%) scale(1);
  opacity: 1;
}

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

.nav-link.active {
  color: var(--primary-color);
  font-weight: 600;
}

/* Mobile Menu */
.mobile-menu {
  background: linear-gradient(
    to bottom,
    rgba(20, 30, 48, 0.98),
    rgba(20, 30, 48, 0.95)
  );
  backdrop-filter: blur(8px);
}

/* Buttons */
.btn-primary {
  transition: var(--transition-default);
  background-color: var(--primary-color);
  color: var(--dark-bg);
  border: none;
  padding: 0.75rem 1.75rem;
  font-weight: 600;
  font-size: 0.95rem;
  letter-spacing: 0.5px;
  border-radius: 4px;
}

.btn-primary:hover {
  transform: translateY(-2px);
  background-color: #34d399;
  box-shadow: 0 5px 15px rgba(45, 212, 191, 0.2);
}

.btn-primary:active {
  transform: translateY(0);
}

/* Sections */
section {
  padding: 6rem 1.5rem;
  margin: 1rem 0;
  border-radius: 12px;
  background: var(--card-bg);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  border: 1px solid var(--border-color);
}

/* Container */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* Cards */
.project-card {
  transition: var(--transition-default);
  background: var(--card-bg);
  border-radius: 8px;
  overflow: hidden;
  border: 1px solid var(--border-color);
}

.project-card:hover {
  transform: translateY(-4px);
  border-color: var(--primary-color);
}

.project-card img {
  width: 100%;
  height: 220px;
  object-fit: cover;
  transition: var(--transition-default);
  filter: grayscale(20%);
}

.project-card:hover img {
  transform: scale(1.02);
  filter: grayscale(0%);
}

/* Skills Section */
.skill-icon {
  transition: var(--transition-default);
  border-radius: 8px;
  padding: 1.25rem;
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  filter: grayscale(30%);
}

.skill-icon:hover {
  transform: translateY(-3px);
  filter: grayscale(0%);
  border-color: var(--primary-color);
}

/* Certificates */
.certificate-item {
  transition: var(--transition-default);
  border-radius: 12px;
  overflow: hidden;
  border: 1px solid var(--border-color);
  background: var(--card-bg);
  position: relative;
  aspect-ratio: 4/3;
}

.certificate-item:hover {
  transform: translateY(-3px);
  border-color: var(--primary-color);
  box-shadow: 0 10px 30px rgba(245, 158, 11, 0.1);
}

.certificate-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.certificate-item .overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(0, 0, 0, 0.8), rgba(0, 0, 0, 0.2));
  opacity: 0;
  transition: opacity 0.3s ease;
}

.certificate-item:hover .overlay {
  opacity: 1;
}

/* Social Links */
.social-link,
.social-icon-link {
  transition: var(--transition-default);
  width: 2.75rem;
  height: 2.75rem;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  color: var(--text-gray);
}

.social-link:hover,
.social-icon-link:hover {
  color: #f59e0b;
  border-color: #f59e0b;
  transform: translateY(-2px);
  box-shadow: 0 5px 15px rgba(245, 158, 11, 0.2);
}

/* Accessibility */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* Typography */
h1,
h2,
h3,
h4,
h5,
h6 {
  font-weight: 600;
  letter-spacing: -0.5px;
  color: var(--text-light);
}

.section-title {
  font-size: 2rem;
  margin-bottom: 3rem;
  position: relative;
  display: inline-block;
}

.section-title::after {
  content: "";
  position: absolute;
  bottom: -0.5rem;
  left: 0;
  width: 2rem;
  height: 2px;
  background-color: var(--primary-color);
}

/* Text & Paragraphs */
p {
  color: var(--text-gray);
  font-size: 1rem;
  line-height: 1.8;
}

/* Responsive Design */
@media (max-width: 768px) {
  section {
    padding: 4rem 1rem;
    margin: 0.5rem 0;
  }

  .container {
    padding: 0 1rem;
  }

  .nav-link::after {
    display: none;
  }

  h1 {
    font-size: 2rem;
  }

  h2 {
    font-size: 1.75rem;
  }

  .section-title {
    font-size: 1.75rem;
    margin-bottom: 2rem;
  }
}

/* Animations */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.animate-fadeIn {
  animation: fadeIn 0.4s ease-out forwards;
}

/* Additional Utilities */
.glass-effect {
  background: var(--card-bg);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  border: 1px solid var(--border-color);
  border-radius: 8px;
}

.text-gradient {
  background: linear-gradient(45deg, var(--primary-color), #34d399);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}