/* ========== Reset & Base ========== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --primary-color: #4b6cb7;
  --secondary-color: #182848;
  --accent-color: #ffb400;
  --bg-light: rgba(255, 255, 255, 0.85);
  --font-color: #1a1a1a;
  --text-dark: #333;
  --card-radius: 12px;
  --active-tag-color: #007bff;
}

/* ========== Typography & Body ========== */
body {
  background: linear-gradient(to right, #f7f9fc, #e3eaf2);
  color: var(--font-color);
  font-family: 'Inter', sans-serif;
  line-height: 1.6;
}

/* ========== Animations ========== */
.fade-in-up     { animation: fadeUp 1s ease-out forwards; }
.slide-in-left  { animation: slideLeft 1s ease-out forwards; }
.slide-in-right { animation: slideRight 1s ease-out forwards; }
.bounce-in      { animation: bounceIn 1s ease-out forwards; }

@keyframes fadeUp {
  from { transform: translateY(30px); opacity: 0; }
  to   { transform: translateY(0); opacity: 1; }
}
@keyframes slideLeft {
  from { transform: translateX(-60px); opacity: 0; }
  to   { transform: translateX(0); opacity: 1; }
}
@keyframes slideRight {
  from { transform: translateX(60px); opacity: 0; }
  to   { transform: translateX(0); opacity: 1; }
}
@keyframes bounceIn {
  0%   { transform: scale(0.9); opacity: 0; }
  50%  { transform: scale(1.05); opacity: 0.8; }
  100% { transform: scale(1); opacity: 1; }
}

/* ========== Header & Navigation ========== */
header {
  background-color: var(--bg-light);
  padding: 1rem 2rem;
  text-align: center;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 2rem;
  background-color: #f5f5f5;
  flex-wrap: wrap;
}

.nav-links {
  display: flex;
  gap: 1.5rem;
  list-style: none;
}

.nav-links li a {
  text-decoration: none;
  color: var(--primary-color);
  font-weight: 600;
  transition: color 0.3s ease;
}

.nav-links li a:hover,
.nav-links li a.active {
  color: var(--secondary-color);
}

.logo-pic {
  width: 60px;
  height: 60px;
  border-radius: 50%;
  object-fit: cover;
  transition: transform 0.3s ease;
}

.logo-pic:hover {
  transform: scale(1.1);
}

/* ========== Section Layout ========== */
section {
  padding: 2rem;
  margin: 2rem auto;
  max-width: 1000px;
  background-color: rgba(255, 255, 255, 0.95);
  border-radius: var(--card-radius);
  box-shadow: 0 8px 16px rgba(0, 0, 0, 0.1);
}

/* ========== Project Grid ========== */
.project-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
}

.project-card {
  background-color: #fff;
  padding: 1.5rem;
  border-radius: var(--card-radius);
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.08);
  transition: transform 0.3s ease;
}
.project-card:hover {
  transform: scale(1.02);
}
.project-card h3 {
  color: var(--primary-color);
  margin-bottom: 0.75rem;
}
.project-card p {
  font-size: 0.95rem;
  color: var(--text-dark);
  margin-bottom: 1rem;
}
.project-card a {
  text-decoration: none;
  font-weight: bold;
  color: var(--accent-color);
  display: inline-block;
  margin-bottom: 1rem;
}
.output-preview img {
  width: 100%;
  border-radius: 8px;
  margin-bottom: 1rem;
}
.output-preview pre {
  background-color: #f8f8f8;
  padding: 1rem;
  border-radius: 8px;
  font-size: 0.85rem;
  overflow-x: auto;
  color: #333;
}

/* ========== Certificate Grid ========== */
.certificate-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
  margin-top: 2rem;
}
.certificate-item {
  background-color: #fff;
  padding: 1rem;
  border-radius: var(--card-radius);
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.08);
  text-align: center;
  transition: transform 0.3s ease;
}
.certificate-item:hover {
  transform: scale(1.03);
}
.certificate-item img {
  width: 100%;
  height: auto;
  max-height: 300px;
  object-fit: contain;
  border-radius: 8px;
  margin-bottom: 0.75rem;
}
.certificate-item p {
  font-size: 0.95rem;
  color: var(--text-dark);
}

/* ========== Skills Matrix ========== */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1.5rem;
  margin-top: 2rem;
}
.skill-box {
  background-color: #fff;
  padding: 1rem 1.5rem;
  border-radius: var(--card-radius);
  box-shadow: 0 4px 12px rgba(0,0,0,0.08);
  transition: transform 0.3s ease;
  text-align: left;
}
.skill-box:hover {
  transform: scale(1.03);
}
.skill-box h3 {
  color: var(--primary-color);
  margin-bottom: 0.5rem;
  font-size: 1.1rem;
}
.skill-box p {
  font-size: 0.9rem;
  color: var(--text-dark);
  margin-bottom: 1rem;
}
progress {
  width: 100%;
  height: 12px;
  border-radius: 20px;
  appearance: none;
}
progress::-webkit-progress-bar {
  background-color: #eee;
  border-radius: 20px;
}
progress::-webkit-progress-value {
  background-color: var(--accent-color);
  border-radius: 20px;
}
.skill-box.high progress::-webkit-progress-value { background-color: #4caf50; }
.skill-box.medium progress::-webkit-progress-value { background-color: #ffa726; }
.skill-box.low progress::-webkit-progress-value { background-color: #f44336; }

/* ========== Explore by Category ========== */
#explore-category {
  background-color: #f4f7fc;
  padding: 3rem 2rem;
  max-width: 900px;
  margin: auto;
  border-radius: var(--card-radius);
  box-shadow: 0 0 18px rgba(0, 0, 0, 0.08);
}

/* Section Heading */
#explore-category h2 {
  font-size: 2.2rem;
  font-weight: 800;
  color: var(--secondary-color);
  text-align: center;
  margin-bottom: 2.5rem;
  border-bottom: 2px solid var(--accent-color);
  padding-bottom: 0.6rem;
  letter-spacing: 1px;
  text-transform: uppercase;
}

/* Skill Tags */
.skill-tags {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1rem;
  margin-bottom: 2rem;
}

.skill-tag {
  font-size: 1rem;
  padding: 0.6rem 1.2rem;
  background-color: #f0f4ff;
  border: 2px solid var(--primary-color);
  border-radius: 25px;
  font-weight: 600;
  color: var(--primary-color);
  cursor: pointer;
  transition: all 0.3s ease;
}
.skill-tag:hover {
  background-color: var(--primary-color);
  color: #fff;
  transform: scale(1.05);
}

.skill-tag.active {
  background-color: var(--accent-color);
  border-color: var(--accent-color);
  color: #fff;
}

/* Skill Content Container */
.skill-content {
  text-align: center;
  margin-top: 2rem;
  padding: 1rem;
  border-radius: var(--card-radius);
  background-color: #ffffff;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
  font-size: 0.95rem;
  color: var(--text-dark);
}

/* ========== Responsive Design ========== */
@media screen and (max-width: 768px) {
  .nav-links {
    flex-direction: column;
    gap: 1rem;
    text-align: center;
  }

  section {
    padding: 1rem;
    margin: 1rem;
  }

  .logo-pic {
    width: 48px;
    height: 48px;
  }

  .project-grid,
  .certificate-grid,
  .skills-grid,
  .category-section {
    grid-template-columns: 1fr;
  }

  #explore-category h2 {
    font-size: 1.6rem;
  }

  .skill-tag {
    font-size: 0.9rem;
    padding: 0.5rem 1rem;
  }

  .skill-content {
    font-size: 0.9rem;
  }
}