:root {
  --bg-primary: #0f172a;
  --bg-secondary: #1e293b;
  --bg-card: #1e293b;
  --bg-skill-card: #ffffff;
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-dark: #1e293b;
  --text-muted: #64748b;
  --accent-color: #38bdf8;
  --accent-hover: #0284c7;
  --dot-active: #2563eb;
  --dot-inactive: #e2e8f0;
  --border-color: rgba(255, 255, 255, 0.1);
  --shadow: 0 10px 30px -10px rgba(0, 0, 0, 0.5);
  --radius: 12px;
  --transition: all 0.3s ease;
}
[data-theme="light"] {
  --bg-primary: #f8fafc;
  --bg-secondary: #ffffff;
  --bg-card: #ffffff;
  --bg-skill-card: #ffffff;
  --text-primary: #0f172a;
  --text-secondary: #64748b;
  --accent-color: #0284c7;
  --accent-hover: #0369a1;
  --border-color: rgba(0, 0, 0, 0.1);
  --shadow: 0 10px 30px -10px rgba(0, 0, 0, 0.08);
}
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
html {
  scroll-behavior: smooth;
  font-family: 'Plus Jakarta Sans', sans-serif;
}
body {
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  transition: var(--transition);
}
a {
  text-decoration: none;
  color: inherit;
}
ul {
  list-style: none;
}
img {
  max-width: 100%;
  height: auto;
  display: block;
}
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 30px;
  border-radius: var(--radius);
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: var(--transition);
}
.btn-primary {
  background-color: var(--accent-color);
  color: #fff;
  box-shadow: 0 4px 14px rgba(56, 189, 248, 0.3);
}
.btn-primary:hover {
  background-color: var(--accent-hover);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(56, 189, 248, 0.4);
}
.btn-block {
  width: 100%;
  justify-content: center;
}
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background-color: rgba(15, 23, 42, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  padding: 16px 0;
  transition: var(--transition);
}
.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.brand-logo {
  font-size: 1.25rem;
  font-weight: 800;
}
.logo-accent {
  color: var(--accent-color);
}
.logo-dot {
  color: #f43f5e;
}
.nav-links {
  display: flex;
  gap: 32px;
}
.nav-link {
  font-weight: 500;
  color: var(--text-secondary);
  transition: var(--transition);
}
.nav-link:hover,
.nav-link.active {
  color: var(--accent-color);
}
.nav-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}
.theme-toggle,
.mobile-menu-btn {
  background: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  width: 40px;
  height: 40px;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
}
.theme-toggle:hover {
  border-color: var(--accent-color);
  color: var(--accent-color);
}
.mobile-menu-btn {
  display: none;
}
.hero {
  padding: 180px 0 120px;
  text-align: center;
}

.hero-container {
  display: flex;
  justify-content: center;
  align-items: center;
}
.hero-content {
  max-width: 780px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 20px;
  background-color: rgba(56, 189, 248, 0.1);
  border: 1px solid rgba(56, 189, 248, 0.2);
  border-radius: 20px;
  font-size: 0.875rem;
  color: var(--accent-color);
  margin-bottom: 24px;
}
.badge-dot {
  width: 8px;
  height: 8px;
  background-color: var(--accent-color);
  border-radius: 50%;
}
.hero-title {
  font-size: 3.25rem;
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 16px;
}
.hero-subtitle {
  font-size: 1.35rem;
  color: var(--text-secondary);
  font-weight: 500;
  margin-bottom: 24px;
}
.hero-description {
  color: var(--text-secondary);
  margin-bottom: 36px;
  font-size: 1.1rem;
  line-height: 1.8;
}
.social-links {
  display: flex;
  gap: 16px;
}
.social-links a {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
}
.social-links a:hover {
  border-color: var(--accent-color);
  color: var(--accent-color);
  transform: translateY(-3px);
}
.skills, .projects, .education, .contact {
  padding: 100px 0;
}
.section-header {
  text-align: center;
  margin-bottom: 50px;
}
.section-tag {
  color: var(--accent-color);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 2px;
  font-size: 0.8rem;
  display: block;
  margin-bottom: 8px;
}
.section-title {
  font-size: 2.25rem;
  font-weight: 700;
  margin-bottom: 12px;
}
.section-title-serif {
  font-family: 'Playfair Display', serif;
  font-size: 2.75rem;
  font-weight: 700;
  margin-bottom: 12px;
}
.section-subtitle {
  color: var(--text-secondary);
  max-width: 680px;
  margin: 0 auto;
}
.skills-columns-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
.skills-column {
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.column-title {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 1.2px;
  color: var(--text-secondary);
  margin-bottom: 4px;
  text-transform: uppercase;
}
.skill-card-box {
  background-color: var(--bg-skill-card);
  border-radius: 16px;
  padding: 16px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
  transition: var(--transition);
}
.skill-card-box:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
}
.skill-card-left {
  display: flex;
  align-items: center;
  gap: 14px;
}
.skill-card-left i {
  font-size: 1.8rem;
}
.skill-icon-js { color: #f7df1e; }
.skill-icon-python { color: #3776ab; }
.skill-icon-html { color: #e34f26; }
.skill-icon-db { color: #336791; }
.skill-icon-git { color: #f05032; }
.skill-icon-figma { color: #a259ff; }
.skill-details {
  display: flex;
  flex-direction: column;
}
.skill-name {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-dark);
}
.skill-level {
  font-size: 0.75rem;
  color: var(--text-muted);
}
.level-dots {
  display: flex;
  gap: 6px;
}
.dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--dot-inactive);
}
.dot.filled {
  background-color: var(--dot-active);
}
.projects-single-wrapper {
  max-width: 800px;
  margin: 0 auto;
}
.project-card-single {
  background-color: var(--bg-card);
  border-radius: 20px;
  overflow: hidden;
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow);
  transition: var(--transition);
}
.project-card-single:hover {
  transform: translateY(-5px);
  border-color: var(--accent-color);
}
.project-img-box {
  position: relative;
  height: 340px;
  overflow: hidden;
}
.project-img-box img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: var(--transition);
}
.project-card-single:hover .project-img-box img {
  transform: scale(1.03);
}
.project-overlay {
  position: absolute;
  inset: 0;
  background-color: rgba(15, 23, 42, 0.75);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: var(--transition);
}
.project-card-single:hover .project-overlay {
  opacity: 1;
}
.btn-detail {
  padding: 12px 24px;
  background-color: var(--accent-color);
  color: #fff;
  border: none;
  border-radius: 10px;
  cursor: pointer;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: var(--transition);
}
.btn-detail:hover {
  background-color: var(--accent-hover);
}
.project-info-box {
  padding: 28px;
}
.project-category {
  font-size: 0.8rem;
  color: var(--accent-color);
  text-transform: uppercase;
  font-weight: 700;
  letter-spacing: 1px;
}
.project-title {
  font-size: 1.5rem;
  margin: 6px 0 10px;
}
.project-desc-short {
  color: var(--text-secondary);
  font-size: 0.95rem;
}
.timeline-wrapper {
  max-width: 700px;
  margin: 0 auto;
  position: relative;
  padding-left: 30px;
}
.timeline-wrapper::before {
  content: '';
  position: absolute;
  left: 7px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  background-color: var(--border-color);
}
.timeline-item {
  position: relative;
  margin-bottom: 40px;
}
.timeline-item:last-child {
  margin-bottom: 0;
}
.timeline-dot {
  position: absolute;
  left: -30px;
  top: 6px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background-color: var(--accent-color);
  border: 4px solid var(--bg-primary);
  box-shadow: 0 0 0 2px var(--accent-color);
}
.timeline-content {
  background-color: var(--bg-card);
  padding: 24px;
  border-radius: var(--radius);
  border: 1px solid var(--border-color);
}
.timeline-date {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--accent-color);
}
.timeline-title {
  font-size: 1.25rem;
  font-weight: 700;
  margin: 4px 0 2px;
}
.timeline-subtitle {
  font-size: 0.95rem;
  color: var(--text-secondary);
  font-weight: 500;
  margin-bottom: 10px;
}
.timeline-content p {
  font-size: 0.9rem;
  color: var(--text-secondary);
}
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.3fr;
  gap: 40px;
}
.contact-info {
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.info-card-link {
  display: block;
}
.info-card {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 20px;
  background-color: var(--bg-card);
  border-radius: var(--radius);
  border: 1px solid var(--border-color);
  transition: var(--transition);
}
.info-card-link:hover .info-card {
  border-color: var(--accent-color);
  transform: translateX(5px);
}
.info-card i {
  font-size: 1.6rem;
  color: var(--accent-color);
  width: 30px;
  text-align: center;
}
.info-card h4 {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 2px;
}
.info-card p {
  font-size: 0.95rem;
  font-weight: 600;
}
.contact-form {
  background-color: var(--bg-card);
  padding: 32px;
  border-radius: var(--radius);
  border: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  gap: 20px;
}
.form-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.form-group label {
  font-size: 0.875rem;
  font-weight: 600;
}
.form-group input,
.form-group textarea {
  padding: 12px 16px;
  border-radius: 8px;
  border: 1px solid var(--border-color);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  font-family: inherit;
  outline: none;
}
.form-group input:focus,
.form-group textarea:focus {
  border-color: var(--accent-color);
}
.footer {
  padding: 32px 0;
  border-top: 1px solid var(--border-color);
  background-color: var(--bg-primary);
}
.footer-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 24px;
}
.footer-left p {
  color: var(--text-secondary);
  font-size: 0.875rem;
}
.footer-center {
  display: flex;
  align-items: center;
  gap: 24px;
}
.footer-center a {
  color: var(--text-secondary);
  font-size: 0.875rem;
  font-weight: 500;
  transition: var(--transition);
}
.footer-center a:hover {
  color: var(--accent-color);
}
.footer-right {
  display: flex;
  align-items: center;
  gap: 12px;
}
.footer-right a {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background-color: rgba(56, 189, 248, 0.1);
  color: #2563eb;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
  font-size: 1.1rem;
}
.footer-right a:hover {
  background-color: #2563eb;
  color: #ffffff;
  transform: translateY(-2px);
}
.toast {
  position: fixed;
  bottom: 20px;
  right: 20px;
  background-color: #10b981;
  color: #fff;
  padding: 12px 24px;
  border-radius: 8px;
  font-weight: 600;
  display: none;
  z-index: 3000;
}
.toast.active {
  display: block;
}
@media (max-width: 1024px) {
  .skills-columns-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}
@media (max-width: 768px) {
  .nav-links {
    position: fixed;
    top: 70px;
    left: -100%;
    width: 100%;
    height: calc(100vh - 70px);
    background-color: var(--bg-primary);
    flex-direction: column;
    align-items: center;
    padding-top: 40px;
    transition: var(--transition);
  }
  .nav-links.active {
    left: 0;
  }
  .mobile-menu-btn {
    display: flex;
  }
  .hero-title {
    font-size: 2.25rem;
  }
  .skills-columns-grid {
    grid-template-columns: 1fr;
  }
  .contact-grid {
    grid-template-columns: 1fr;
  }
  .footer-container {
    flex-direction: column;
    text-align: center;
    justify-content: center;
  }
  .footer-center {
    flex-wrap: wrap;
    justify-content: center;
    gap: 16px;
  }
}