:root {
  /* Material You / Modern Theme - Light */
  --md-bg: #F8F9FA;
  --md-surface: #FFFFFF;
  --md-surface-variant: #F1F3F5;
  --md-on-bg: #212529;
  --md-on-surface: #343A40;
  --md-on-surface-variant: #495057;
  
  --md-primary: #4C6EF5; /* Vibrant Blue */
  --md-primary-container: #DBE4FF;
  --md-on-primary-container: #364FC7;
  
  --md-secondary: #15AABF;
  --md-secondary-container: #E3FAFC;
  --md-on-secondary-container: #0B7285;

  --md-outline: #DEE2E6;
  --md-outline-variant: #E9ECEF;

  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-xl: 32px;

  --shadow-sm: 0 2px 4px rgba(0,0,0,0.02), 0 4px 12px rgba(0,0,0,0.04);
  --shadow-md: 0 4px 8px rgba(0,0,0,0.04), 0 12px 24px rgba(0,0,0,0.06);

  --font-family: 'Outfit', -apple-system, BlinkMacSystemFont, sans-serif;
  
  --icon-filter: brightness(0) invert(40%); /* Dark gray */
  --icon-primary-filter: brightness(0) invert(20%); /* Dark filter */
}

[data-theme="dark"] {
  /* Material You / Modern Theme - Dark */
  --md-bg: #121212;
  --md-surface: #1E1E1E;
  --md-surface-variant: #2D2D2D;
  --md-on-bg: #F8F9FA;
  --md-on-surface: #E9ECEF;
  --md-on-surface-variant: #CED4DA;
  
  --md-primary: #748FFC;
  --md-primary-container: #364FC7;
  --md-on-primary-container: #DBE4FF;
  
  --md-secondary: #3BC9DB;
  --md-secondary-container: #0C8599;
  --md-on-secondary-container: #E3FAFC;

  --md-outline: #495057;
  --md-outline-variant: #343A40;

  --shadow-sm: 0 4px 12px rgba(0,0,0,0.2);
  --shadow-md: 0 8px 24px rgba(0,0,0,0.3);

  --icon-filter: brightness(0) invert(85%); /* Light gray / off-white */
  --icon-primary-filter: brightness(0) invert(95%); /* Lighter shade of white */
}

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

body {
  font-family: var(--font-family);
  background-color: var(--md-bg);
  color: var(--md-on-bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  transition: background-color 0.4s ease, color 0.4s ease;
}

/* Utilities */
.mt-2 { margin-top: 0.5rem; }
.mt-3 { margin-top: 1rem; }

/* Images and Icons */
.icon, .inline-icon {
  width: 18px;
  height: 18px;
  filter: var(--icon-filter);
  transition: filter 0.3s ease;
}

.chip-icon {
  width: 18px;
  height: 18px;
}

body:not([data-theme="dark"]) .js-icon {
  filter: brightness(0.6) contrast(1.4);
}

.section-icon {
  width: 32px;
  height: 32px;
  filter: var(--icon-primary-filter);
}

.small-icon {
  width: 24px;
  height: 24px;
}

/* Nav & Theme Toggle */
.top-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: var(--md-surface);
  border-bottom: 1px solid var(--md-outline-variant);
}

.nav-content {
  max-width: 1200px;
  margin: 0 auto;
  padding: 1rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--md-primary);
  letter-spacing: -1px;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.mobile-contact-links {
  display: none;
}

.nav-icon {
  width: 22px;
  height: 22px;
  filter: var(--icon-filter);
  transition: filter 0.3s ease;
  display: block;
}

.nav-icon:hover {
  filter: var(--icon-primary-filter);
}

.theme-toggle, .lang-toggle {
  background: var(--md-surface-variant);
  border: none;
  border-radius: 50%;
  width: 44px;
  height: 44px;
  display: flex;
  justify-content: center;
  align-items: center;
  cursor: pointer;
  transition: transform 0.2s, background-color 0.3s;
  font-family: 'Outfit', sans-serif;
  font-weight: 600;
  color: var(--md-on-background);
  font-size: 14px;
}

.theme-toggle:hover, .lang-toggle:hover {
  transform: scale(1.05);
  background: var(--md-outline-variant);
}

.theme-icon {
  width: 24px;
  height: 24px;
  filter: var(--icon-primary-filter);
}

body:not([data-theme="dark"]) .light-icon { display: none; }
body[data-theme="dark"] .dark-icon { display: none; }

body:not([data-theme="dark"]) .dark-only { display: none; }
body[data-theme="dark"] .light-only { display: none; }

/* Layout Structure */
.layout-wrapper {
  max-width: 1200px;
  margin: 2rem auto;
  padding: 0 2rem;
  display: grid;
  grid-template-columns: 350px 1fr;
  gap: 3rem;
  align-items: start;
}

/* Sidebar Profile */
.sidebar {
  position: sticky;
  top: 6rem;
}

.profile-card {
  background: var(--md-surface);
  border-radius: var(--radius-lg);
  padding: 2.5rem 2rem;
  box-shadow: var(--shadow-sm);
  text-align: center;
  border: 1px solid var(--md-outline-variant);
  transition: box-shadow 0.3s;
}

.profile-card:hover {
  box-shadow: var(--shadow-md);
}

.avatar {
  width: 100px;
  height: 100px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--md-primary), var(--md-secondary));
  display: flex;
  justify-content: center;
  align-items: center;
  margin: 0 auto 1.5rem;
  box-shadow: 0 8px 16px rgba(76, 110, 245, 0.25);
  overflow: hidden;
}

.avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.display-name {
  font-size: 2rem;
  font-weight: 700;
  color: var(--md-on-surface);
  line-height: 1.2;
  margin-bottom: 0.5rem;
}

.role-title {
  color: var(--md-on-surface-variant);
  font-size: 1.1rem;
  margin-bottom: 2rem;
}

.highlight {
  color: var(--md-primary);
  font-weight: 600;
}

.contact-links {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.contact-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  padding: 0.75rem 1rem;
  background: var(--md-surface-variant);
  color: var(--md-on-surface);
  text-decoration: none;
  border-radius: var(--radius-md);
  font-weight: 500;
  transition: all 0.2s;
  border: 1px solid transparent;
}

.contact-btn:hover {
  background: var(--md-primary-container);
  color: var(--md-on-primary-container);
  border-color: rgba(76, 110, 245, 0.2);
}

.contact-btn:hover .icon {
  filter: var(--icon-primary-filter);
}

.location-badge {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem;
  color: var(--md-on-surface-variant);
  font-size: 0.95rem;
}

/* Main Content area */
.section {
  margin-bottom: 4rem;
}

.section-header {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.section-header.small {
  margin-bottom: 1rem;
}

.section-title {
  font-size: 2rem;
  font-weight: 600;
  color: var(--md-on-bg);
}

/* Project Card */
.project-card {
  background: var(--md-surface);
  border-radius: var(--radius-lg);
  padding: 2rem;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--md-outline-variant);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.project-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.project-header {
  margin-bottom: 1.5rem;
}

.project-title-area {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.project-logo-wrapper {
  width: 72px;
  height: 72px;
  border-radius: var(--radius-md);
  display: flex;
  justify-content: center;
  align-items: center;
}

.project-logo {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.project-title {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 0.25rem;
  color: var(--md-on-surface);
}

.project-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--md-primary);
  text-decoration: none;
  font-weight: 500;
  font-size: 0.95rem;
}

.project-link:hover {
  text-decoration: underline;
}

.text-body {
  font-size: 1.05rem;
  color: var(--md-on-surface-variant);
  margin-bottom: 1rem;
}

/* Timeline specific */
.timeline {
  position: relative;
  padding-left: 2rem;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--md-outline-variant);
  border-radius: 2px;
}

.timeline-item {
  position: relative;
  margin-bottom: 2rem;
}

.timeline-item:last-child {
  margin-bottom: 0;
}

.timeline-dot {
  position: absolute;
  left: -2.4rem;
  top: 1.5rem;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--md-primary);
  border: 3px solid var(--md-bg);
  box-shadow: 0 0 0 2px var(--md-primary-container);
}

.timeline-dot.alt {
  background: var(--md-secondary);
  box-shadow: 0 0 0 2px var(--md-secondary-container);
}

.timeline-content.card {
  background: var(--md-surface);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  border: 1px solid var(--md-outline-variant);
  box-shadow: var(--shadow-sm);
  transition: background-color 0.3s ease;
}

.timeline-content.card:hover {
  background: var(--md-surface-variant);
}

.card-header-flex {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 1rem;
}

.item-title {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--md-on-surface);
}

.item-subtitle {
  color: var(--md-on-surface-variant);
  font-weight: 500;
  font-size: 0.95rem;
  margin-top: 0.2rem;
}

.date-chip {
  background: var(--md-primary-container);
  color: var(--md-on-primary-container);
  padding: 0.3rem 0.8rem;
  border-radius: var(--radius-xl);
  font-size: 0.85rem;
  font-weight: 600;
  white-space: nowrap;
}

/* Lists */
.styled-list {
  padding-left: 1.2rem;
  color: var(--md-on-surface-variant);
}

.styled-list li {
  margin-bottom: 0.5rem;
}

.styled-list li::marker {
  color: var(--md-primary);
}

.styled-list.compact li {
  margin-bottom: 0.25rem;
}

/* Tech Chips */
.tech-stack {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-top: 1.5rem;
}

.tech-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.4rem 0.8rem;
  background: var(--md-surface-variant);
  color: var(--md-on-surface);
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  font-weight: 500;
  border: 1px solid var(--md-outline);
}

/* Bento Grid System for Bottom Section */
.bento-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
}

.bento-card {
  background: var(--md-surface);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  border: 1px solid var(--md-outline-variant);
  box-shadow: var(--shadow-sm);
}

/* Skills Formatting */
h4 {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--md-on-surface);
  margin-bottom: 0.75rem;
}

.chips-wrap {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.skill-chip {
  background: transparent;
  border: 1px solid var(--md-primary);
  color: var(--md-primary);
  padding: 0.3rem 0.8rem;
  border-radius: var(--radius-xl);
  font-size: 0.85rem;
  font-weight: 500;
  transition: all 0.2s;
}

.skill-chip:hover {
  background: var(--md-primary);
  color: var(--md-surface);
}

/* Language Bars */
.lang-list {
  display: flex;
  flex-direction: column;
  gap: 1.2rem;
}

.lang-item {
  width: 100%;
}

.lang-info {
  display: flex;
  justify-content: space-between;
  margin-bottom: 0.4rem;
}

.lang-name {
  font-weight: 500;
  color: var(--md-on-surface);
}

.lang-level {
  font-size: 0.85rem;
  color: var(--md-on-surface-variant);
  font-weight: 600;
}

.progress-bar {
  height: 8px;
  background: var(--md-surface-variant);
  border-radius: 4px;
  overflow: hidden;
}

.progress {
  height: 100%;
  background: var(--md-primary);
  border-radius: 4px;
  transition: width 1s ease-in-out;
}

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

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

.slide-up {
  animation: slideUp 0.6s ease-out forwards;
}

@keyframes slideUp {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Responsive */
@media (max-width: 900px) {
  .layout-wrapper {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
  
  .sidebar {
    display: none;
  }
  
  .bento-grid {
    grid-template-columns: 1fr;
  }

  .mobile-contact-links {
    display: flex;
    align-items: center;
    gap: 1.25rem;
  }
}

@media (max-width: 600px) {
  .layout-wrapper {
    padding: 0 1rem;
  }
  
  .timeline {
    padding-left: 1.5rem;
  }
  
  .timeline-dot {
    left: -1.95rem;
  }
}