/* Base Styles */
:root {
  /* Dark theme (default) */
  --primary-color: #1a1a1a;
  --secondary-color: #2a2a2a;
  --accent-color: #4a4a4a;
  --text-color: #ffffff;
  --text-secondary: #cccccc;
  --border-radius: 12px;
  --transition: all 0.3s ease;
}

/* Light theme */
[data-theme="light"] {
  --primary-color: #ffffff;
  --secondary-color: #f5f5f5;
  --accent-color: #e0e0e0;
  --text-color: #1a1a1a;
  --text-secondary: #4a4a4a;
}

/* Theme toggle button */
.theme-toggle {
  background: none;
  border: none;
  color: var(--text-color);
  cursor: pointer;
  padding: 8px;
  margin-left: 15px;
  font-size: 1.2rem;
  transition: var(--transition);
}

.theme-toggle:hover {
  transform: rotate(180deg);
}

/* Animation classes */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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

.slide-in-left {
  opacity: 0;
  transform: translateX(-50px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.slide-in-left.visible {
  opacity: 1;
  transform: translateX(0);
}

.slide-in-right {
  opacity: 0;
  transform: translateX(50px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.slide-in-right.visible {
  opacity: 1;
  transform: translateX(0);
}

/* Loading Animation */
.loader-wrapper {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--primary-color);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 9999;
    transition: opacity 0.3s ease-out;
}

.loader {
    position: relative;
    font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
    font-size: 4rem;
    font-weight: 800;
    color: var(--text-color);
    text-transform: uppercase;
    letter-spacing: 8px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
}

.loader .title {
    opacity: 0;
    transform: translateY(20px);
    animation: slideUp 0.8s ease forwards;
}

.loader .subtitle {
    font-size: 1.5rem;
    color: var(--text-secondary);
    letter-spacing: 4px;
    opacity: 0;
    transform: translateY(20px);
    animation: slideUp 0.8s ease forwards 0.3s;
}

@keyframes slideUp {
    0% {
        opacity: 0;
        transform: translateY(20px);
    }
    100% {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-out {
    opacity: 0;
    pointer-events: none;
}

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

body {
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  background-color: var(--primary-color);
  color: var(--text-color);
  line-height: 1.6;
}

.container {
  width: 90%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 15px;
}

a {
  text-decoration: none;
  color: var(--text-color);
  transition: var(--transition);
}

ul {
  list-style: none;
}

img {
  max-width: 100%;
  height: auto;
}

section {
  padding: 80px 0;
}

h1, h2, h3, h4 {
  margin-bottom: 20px;
  line-height: 1.2;
}

h2 {
  font-size: 2.5rem;
  text-align: center;
  margin-bottom: 40px;
}

.btn {
  display: inline-block;
  background-color: var(--accent-color);
  color: var(--text-color);
  padding: 10px 20px;
  border-radius: var(--border-radius);
  transition: var(--transition);
  border: none;
  cursor: pointer;
}

.btn:hover {
  background-color: #666;
  transform: translateY(-2px);
}

.btn-sm {
  padding: 8px 16px;
  font-size: 0.9rem;
}

.btn-outline {
  background-color: transparent;
  border: 1px solid var(--accent-color);
}

.btn-outline:hover {
  background-color: var(--accent-color);
}

/* Header */
header {
  background-color: var(--primary-color);
  padding: 20px 0;
  position: fixed;
  width: 100%;
  top: 0;
  z-index: 1000;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo h1 {
  font-size: 1.5rem;
  margin-bottom: 0;
}

.desktop-nav ul {
  display: flex;
}

.desktop-nav li {
  margin: 0 15px;
}

.desktop-nav a {
  position: relative;
  padding: 5px 0;
}

.desktop-nav a::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--text-color);
  transition: var(--transition);
}

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

.mobile-menu-btn {
  display: none;
  font-size: 1.5rem;
  cursor: pointer;
}

.mobile-nav {
  display: none;
  position: fixed;
  top: 80px;
  left: 0;
  width: 100%;
  background-color: var(--secondary-color);
  padding: 20px;
  z-index: 999;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
  transform: translateY(-100%);
  transition: transform 0.3s ease-in-out;
}

.mobile-nav.active {
  transform: translateY(0);
  display: block;
}

.mobile-nav ul {
  display: flex;
  flex-direction: column;
}

.mobile-nav li {
  margin: 10px 0;
}

/* Hero Section */
.hero {
  padding-top: 150px;
  min-height: 100vh;
  display: flex;
  align-items: center;
}

.hero-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 40px;
}

.hero-text {
  flex: 1;
}

.hero-text h2 {
  font-size: 3rem;
  margin-bottom: 20px;
  text-align: left;
}

.hero-text p {
  font-size: 1.2rem;
  color: var(--text-secondary);
  margin-bottom: 30px;
}

.hero-text ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.hero-text ul li {
  font-size: 1.2rem;
  color: var(--text-secondary);
  margin-bottom: 15px;
  padding-bottom: 5px;
  display: block;
  transition: transform 0.3s ease, border-bottom 0.3s ease;
  border-bottom: 2px solid transparent;
  width: fit-content;
}

.hero-text ul li a {
  color: var(--text-secondary);
  text-decoration: none;
}

.hero-text ul li:hover {
  transform: translateY(-3px);
  border-bottom: 2px solid #888;
}

.hero-image {
  flex: 1;
  border-radius: var(--border-radius);
  overflow: hidden;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
}

.hero-image img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: var(--border-radius);
  transition: transform 0.5s ease;
}

.hero-image img:hover {
  transform: scale(1.02);
}

/* Skills Section */
.skills {
  background-color: var(--primary-color);
  padding: 80px 0;
}

.skills-wrapper {
  position: relative;
}

.skills-category {
  margin-bottom: 40px;
}

.skills-category:last-child {
  margin-bottom: 0;
}

.skills-category h3 {
  font-size: 1.8rem;
  margin-bottom: 25px;
  color: var(--text-color);
  position: relative;
  display: inline-block;
}

.skills-category h3::after {
  content: "";
  position: absolute;
  bottom: -8px;
  left: 0;
  width: 40px;
  height: 3px;
  background-color: var(--accent-color);
}

.skills-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 10px;
}

.skill-tag {
  display: flex;
  align-items: center;
  background-color: var(--secondary-color);
  border-radius: 50px;
  padding: 8px 16px;
  transition: all 0.3s ease;
}

.skill-tag:hover {
  transform: translateY(-3px);
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
  background-color: #3a3a3a;
}

.skill-tag i {
  font-size: 1.2rem;
  margin-right: 8px;
}

.skill-tag span {
  font-size: 0.9rem;
  font-weight: 500;
}

/* Projects Section */
.section-description {
  text-align: center;
  max-width: 700px;
  margin: 0 auto 40px;
  color: var(--text-secondary);
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 30px;
}

.project-card {
  background-color: var(--secondary-color);
  border-radius: var(--border-radius);
  overflow: hidden;
  transition: var(--transition);
}

.project-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
}

.project-image {
  height: 200px;
  overflow: hidden;
}

.project-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: var(--transition);
}

.project-card:hover .project-image img {
  transform: scale(1.05);
}

.project-info {
  padding: 20px;
}

.project-info h3 {
  font-size: 1.5rem;
  margin-bottom: 10px;
}

.project-info p {
  color: var(--text-secondary);
  margin-bottom: 20px;
}

.project-links {
  display: flex;
  gap: 10px;
}

/* About Section */
.about-content {
  display: flex;
  justify-content: center;
}

.about-text {
  max-width: 800px;
}

.about-text p {
  margin-bottom: 20px;
  font-size: 1.1rem;
}

.contact-info {
  margin-top: 40px;
}

.contact-info h3 {
  font-size: 1.5rem;
  margin-bottom: 15px;
}

.contact-info ul {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
}

.contact-info li {
  display: flex;
  align-items: center;
  gap: 10px;
}

.contact-info i {
  font-size: 1.2rem;
}

/* Certifications Section */
.certifications {
  background-color: #1e1e1e;
  padding: 80px 0;
}

.certifications-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 25px;
}

.certification-card {
  background-color: var(--secondary-color);
  border-radius: var(--border-radius);
  padding: 25px;
  display: flex;
  align-items: flex-start;
  gap: 20px;
  transition: var(--transition);
}

.certification-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
  background-color: #333;
}

.certification-logo {
  background-color: rgba(255, 255, 255, 0.1);
  border-radius: 50%;
  width: 60px;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.certification-logo i {
  font-size: 1.8rem;
  color: var(--text-color);
}

.certification-details {
  flex: 1;
}

.certification-details h3 {
  font-size: 1.3rem;
  margin-bottom: 8px;
}

.certification-issuer {
  color: var(--text-secondary);
  font-size: 0.95rem;
  margin-bottom: 5px;
}

.certification-date {
  color: var(--text-secondary);
  font-size: 0.85rem;
  margin-bottom: 15px;
}

.certification-link {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-size: 0.9rem;
  color: var(--text-color);
  transition: var(--transition);
}

.certification-link:hover {
  color: #fff;
  text-decoration: underline;
}

.certification-link i {
  font-size: 0.8rem;
}

.certification-logo img {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
}

/* Responsive adjustments for certifications */
@media (max-width: 768px) {
  .certifications-grid {
    grid-template-columns: 1fr;
  }
}

/* Footer */
footer {
  background-color: var(--secondary-color);
  padding: 30px 0;
  text-align: center;
}

/* Responsive Styles */
@media (max-width: 992px) {
  .hero-content {
    flex-direction: column;
  }

  .hero-text,
  .hero-image {
    flex: none;
    width: 100%;
  }

  .hero-text h2 {
    font-size: 2.5rem;
  }
}

/* ==== EXPERIENCE SECTION (TIMELINE) ==== */
.experience {
  background-color: var(--primary-color);
  padding: 80px 0;
}

.experience .section-description {
  text-align: center;
  max-width: 800px;
  margin: 0 auto 30px;
  color: var(--text-secondary);
}

/* Timeline wrapper */
.experience-timeline {
  position: relative;
  margin: 40px auto 0;
  padding: 20px 0;
  max-width: 1000px;
}

/* Center line */
.experience-timeline::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: 50%;
  width: 3px;
  transform: translateX(-50%);
  background: linear-gradient(
    to bottom,
    transparent 0%,
    var(--accent-color) 15%,
    var(--accent-color) 85%,
    transparent 100%
  );
  opacity: 0.8;
}

/* Each item */
.experience-item {
  position: relative;
  display: flex;
  gap: 20px;
  margin: 40px 0;
}

/* Alternate items left/right */
.experience-item:nth-child(odd) .experience-content {
  margin-left: auto;
}
.experience-item:nth-child(even) .experience-content {
  margin-right: auto;
}

/* Date section */
.experience-date {
  display: flex;
  align-items: center;
  justify-content: center;
  flex: 0 0 50%;
  padding: 0 20px;
}

.date-badge {
  display: inline-block;
  background-color: var(--secondary-color);
  color: var(--text-color);
  border: 1px solid var(--accent-color);
  border-radius: 999px;
  padding: 8px 14px;
  font-size: 0.95rem;
  letter-spacing: 0.2px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.15);
}

.date-badge.current {
  background: linear-gradient(135deg, var(--accent-color), #6a6a6a);
  border-color: transparent;
}

/* Content card */
.experience-content {
  position: relative;
  flex: 0 0 50%;
  background-color: var(--primary-color);
  border: 1px solid var(--accent-color);
  border-radius: var(--border-radius);
  padding: 20px 22px;
  box-shadow: 0 8px 24px rgba(0,0,0,0.18);
}

/* Dots on the center line for each item */
.experience-content::after {
  content: "";
  position: absolute;
  top: 22px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--accent-color);
  border: 2px solid var(--primary-color);
  box-shadow: 0 0 0 4px rgba(255,255,255,0.05);
}

/* Arrow pointers from the center line into the card */
.experience-content::before {
  content: "";
  position: absolute;
  top: 18px;
  border: 10px solid transparent;
}

/* Position dots & arrows depending on side */
.experience-item:nth-child(odd) .experience-content::after {
  left: -7px;
}
.experience-item:nth-child(odd) .experience-content::before {
  left: -20px;
  border-right-color: var(--primary-color);
}

.experience-item:nth-child(even) .experience-content::after {
  right: -7px;
}
.experience-item:nth-child(even) .experience-content::before {
  right: -20px;
  border-left-color: var(--primary-color);
}

/* Headers within content */
.experience-header h3 {
  margin: 0 0 4px 0;
  font-size: 1.25rem;
}

.experience-header h4 {
  margin: 0 0 12px 0;
  font-weight: 500;
  color: var(--text-secondary);
}

/* Description */
.experience-description p {
  margin-bottom: 12px;
  color: var(--text-secondary);
}

/* Skills inside experience */
.experience-skills {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 6px;
}
.experience-skills .skill-tag {
  background-color: var(--secondary-color);
  border-radius: 999px;
  padding: 6px 12px;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.85rem;
  border: 1px solid var(--accent-color);
}

/* --- Responsive --- */
@media (max-width: 992px) {
  .experience-timeline::before {
    left: 30px;
    transform: none;
  }
  .experience-item {
    flex-direction: column;
    margin-left: 60px;
  }
  .experience-date {
    align-items: flex-start;
    justify-content: flex-start;
    margin-bottom: 8px;
    padding: 0;
    flex-basis: auto;
  }
  .experience-content {
    margin: 0 !important;
  }
  .experience-content::before {
    top: -10px;
    left: -30px !important;
    right: auto !important;
    border: 10px solid transparent;
    border-bottom-color: var(--primary-color) !important;
  }
  .experience-content::after {
    left: -37px !important;
    right: auto !important;
    top: 0;
    transform: translateY(10px);
  }
}


@media (max-width: 768px) {
  header .container {
    flex-wrap: wrap;
  }

  .desktop-nav {
    display: none;
  }

  .mobile-menu-btn {
    display: block;
  }

  .hero {
    padding-top: 120px;
  }

  .hero-text h2 {
    font-size: 2rem;
  }

  .projects-grid {
    grid-template-columns: 1fr;
  }

  .contact-info ul {
    flex-direction: column;
    gap: 15px;
  }

  .skills-category h3 {
    font-size: 1.5rem;
    margin-bottom: 20px;
  }
}

@media (max-width: 576px) {
  section {
    padding: 60px 0;
  }

  h2 {
    font-size: 2rem;
  }

  .hero-text h2 {
    font-size: 1.8rem;
  }

  .hero-text p {
    font-size: 1rem;
  }

  .skills-tags {
    gap: 8px;
  }

  .skill-tag {
    padding: 6px 12px;
  }

  .skill-tag i {
    font-size: 1rem;
  }

  .skill-tag span {
    font-size: 0.8rem;
  }
}