:root {
  --md-sys-color-primary: #6750a4;
  --md-sys-color-on-primary: #ffffff;
  --md-sys-color-primary-container: #eaddff;
  --md-sys-color-on-primary-container: #21005d;
  --md-sys-color-secondary: #625b71;
  --md-sys-color-on-secondary: #ffffff;
  --md-sys-color-secondary-container: #e8def8;
  --md-sys-color-on-secondary-container: #1d192b;
  --md-sys-color-tertiary: #7d5260;
  --md-sys-color-on-tertiary: #ffffff;
  --md-sys-color-surface: #0f0d13;
  --md-sys-color-on-surface: #e6e0e9;
  --md-sys-color-surface-variant: #49454f;
  --md-sys-color-on-surface-variant: #cac4d0;
  --md-sys-color-surface-container-low: #1d1b20;
  --md-sys-color-surface-container: #211f26;
  --md-sys-color-surface-container-high: #2b2930;
  --md-sys-color-surface-container-highest: #36343b;
  --md-sys-color-outline: #938f99;
  --md-sys-color-outline-variant: #49454f;
  
  --md-motion-easing-standard: cubic-bezier(0.2, 0, 0, 1);
  --md-motion-easing-emphasized: cubic-bezier(0.05, 0.7, 0.1, 1);
  --md-motion-duration-short: 200ms;
  --md-motion-duration-medium: 300ms;
  --md-motion-duration-long: 400ms;
}

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

body {
  font-family: 'Inter', sans-serif;
  line-height: 1.6;
  color: var(--md-sys-color-on-surface);
  background-color: var(--md-sys-color-surface);
  overflow-x: hidden;
}

.glass-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: radial-gradient(circle at top right, rgba(103, 80, 164, 0.08), transparent);
  pointer-events: none;
  z-index: -1;
}

header {
  background-color: var(--md-sys-color-surface-container);
  position: fixed;
  width: 100%;
  top: 0;
  z-index: 1000;
  border-bottom: 1px solid var(--md-sys-color-outline-variant);
}

nav {
  max-width: 1200px;
  margin: 0 auto;
  padding: 16px 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo img {
  height: 40px;
  transition: transform var(--md-motion-duration-short) var(--md-motion-easing-standard);
}

.logo img:hover {
  transform: scale(1.05);
}

.hamburger {
  display: none;
  flex-direction: column;
  cursor: pointer;
  padding: 8px;
}

.hamburger span {
  width: 25px;
  height: 3px;
  background: var(--md-sys-color-on-surface);
  margin: 3px 0;
  transition: all var(--md-motion-duration-medium) var(--md-motion-easing-standard);
}

.hamburger.active span:nth-child(1) {
  transform: rotate(-45deg) translate(-5px, 6px);
}

.hamburger.active span:nth-child(2) {
  opacity: 0;
}

.hamburger.active span:nth-child(3) {
  transform: rotate(45deg) translate(-5px, -6px);
}

.nav-links {
  display: flex;
  list-style: none;
  gap: 8px;
}

.nav-links a {
  text-decoration: none;
  color: var(--md-sys-color-on-surface);
  font-weight: 500;
  transition: all var(--md-motion-duration-medium) var(--md-motion-easing-standard);
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 16px;
  border-radius: 100px;
  position: relative;
  overflow: hidden;
}

.nav-links a::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--md-sys-color-primary);
  opacity: 0;
  transition: opacity var(--md-motion-duration-medium) var(--md-motion-easing-standard);
  z-index: -1;
}

.nav-links a:hover::before {
  opacity: 0.08;
}

.nav-links a:hover {
  color: var(--md-sys-color-primary);
  transform: translateY(-2px);
}

.hero {
  position: relative;
  text-align: center;
  padding: 128px 24px;
  overflow: hidden;
}

.hero-background {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(135deg, var(--md-sys-color-primary-container), var(--md-sys-color-secondary-container));
  opacity: 0.1;
  z-index: -1;
}

.hero h1 {
  font-size: 3.5rem;
  font-weight: 700;
  margin-bottom: 16px;
  background: linear-gradient(45deg, var(--md-sys-color-primary), var(--md-sys-color-tertiary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  animation: slideInUp var(--md-motion-duration-long) var(--md-motion-easing-emphasized);
}

.hero p {
  font-size: 1.25rem;
  margin-bottom: 32px;
  color: var(--md-sys-color-on-surface-variant);
  animation: fadeIn var(--md-motion-duration-long) var(--md-motion-easing-standard) 200ms both;
}

@keyframes slideInUp {
  from {
    transform: translateY(32px);
    opacity: 0;
  }
  to {
    transform: translateY(0);
    opacity: 1;
  }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

.cta-button {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 16px 24px;
  background-color: var(--md-sys-color-primary);
  color: var(--md-sys-color-on-primary);
  text-decoration: none;
  border-radius: 100px;
  font-weight: 600;
  transition: all var(--md-motion-duration-medium) var(--md-motion-easing-emphasized);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.12), 0 1px 2px rgba(0, 0, 0, 0.24);
  animation: scaleIn var(--md-motion-duration-medium) var(--md-motion-easing-emphasized) 400ms both;
}

.cta-button:hover {
  background-color: var(--md-sys-color-primary);
  transform: translateY(-2px) scale(1.02);
  box-shadow: 0 3px 6px rgba(0, 0, 0, 0.16), 0 3px 6px rgba(0, 0, 0, 0.23);
}

@keyframes scaleIn {
  from {
    transform: scale(0.9);
    opacity: 0;
  }
  to {
    transform: scale(1);
    opacity: 1;
  }
}

.projects {
  padding: 64px 24px;
  max-width: 1200px;
  margin: 0 auto;
}

.section-title {
  text-align: center;
  margin-bottom: 32px;
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--md-sys-color-on-surface);
}

.search-container {
  position: relative;
  margin-bottom: 32px;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.search-icon {
  position: absolute;
  left: 16px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--md-sys-color-on-surface-variant);
}

#projectSearch {
  width: 100%;
  padding: 16px 16px 16px 48px;
  border: 1px solid var(--md-sys-color-outline-variant);
  border-radius: 28px;
  font-size: 16px;
  background: var(--md-sys-color-surface-container);
  color: var(--md-sys-color-on-surface);
  transition: all var(--md-motion-duration-medium) var(--md-motion-easing-standard);
}

#projectSearch:focus {
  outline: none;
  border-color: var(--md-sys-color-primary);
  box-shadow: 0 0 0 3px rgba(103, 80, 164, 0.12);
}

.projects-controls {
  display: flex;
  justify-content: center;
  gap: 16px;
  margin-bottom: 32px;
}

.projects-toggle {
  padding: 12px 24px;
  border: 1px solid var(--md-sys-color-outline);
  border-radius: 100px;
  background: var(--md-sys-color-surface-container);
  color: var(--md-sys-color-on-surface);
  cursor: pointer;
  transition: all var(--md-motion-duration-medium) var(--md-motion-easing-standard);
  font-weight: 500;
}

.projects-toggle.active {
  background: var(--md-sys-color-primary-container);
  color: var(--md-sys-color-on-primary-container);
  border-color: var(--md-sys-color-primary);
}

.projects-toggle:hover:not(.active) {
  background: var(--md-sys-color-surface-container-high);
}

.project-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 24px;
}

.project-card {
  background: var(--md-sys-color-surface-container);
  border-radius: 24px;
  padding: 24px;
  border: 1px solid var(--md-sys-color-outline-variant);
  transition: all var(--md-motion-duration-medium) var(--md-motion-easing-emphasized);
  display: flex;
  flex-direction: column;
  height: 100%;
  min-height: 280px;
  position: relative;
  overflow: hidden;
}

.project-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(135deg, var(--md-sys-color-primary), var(--md-sys-color-tertiary));
  opacity: 0;
  transition: opacity var(--md-motion-duration-medium) var(--md-motion-easing-standard);
  z-index: -1;
}

.project-card:hover::before {
  opacity: 0.04;
}

.project-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 8px 16px rgba(0, 0, 0, 0.16);
  border-color: var(--md-sys-color-outline);
}

.project-content {
  flex-grow: 1;
}

.project-card h3 {
  margin-bottom: 12px;
  color: var(--md-sys-color-on-surface);
  font-weight: 600;
  font-size: 1.25rem;
  display: flex;
  align-items: center;
  gap: 8px;
}

.project-card p {
  color: var(--md-sys-color-on-surface-variant);
  margin-bottom: 16px;
  line-height: 1.5;
}

.project-meta {
  display: flex;
  gap: 8px;
  margin-bottom: 16px;
  flex-wrap: wrap;
}

.project-tag {
  font-size: 0.75rem;
  padding: 4px 8px;
  border-radius: 12px;
  font-weight: 500;
}

.tag-new {
  background: #ff6b6b;
  color: white;
}

.tag-alpha {
  background: var(--md-sys-color-tertiary);
  color: var(--md-sys-color-on-tertiary);
}

.tag-beta {
  background: var(--md-sys-color-secondary);
  color: var(--md-sys-color-on-secondary);
}

.tag-open-beta {
  background: #4CAF50;
  color: white;
}

.tag-pinned {
  background: var(--md-sys-color-primary-container);
  color: var(--md-sys-color-on-primary-container);
}

.project-stats {
  display: flex;
  gap: 16px;
  margin-bottom: 16px;
  font-size: 0.875rem;
  color: var(--md-sys-color-on-surface-variant);
}

.project-stat {
  display: flex;
  align-items: center;
  gap: 4px;
}

.project-links {
  display: flex;
  gap: 12px;
  margin-top: auto;
}

.project-links a {
  display: flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  color: var(--md-sys-color-primary);
  font-weight: 500;
  transition: all var(--md-motion-duration-medium) var(--md-motion-easing-standard);
  padding: 8px 16px;
  border-radius: 20px;
  background: var(--md-sys-color-primary-container);
  flex: 1;
  justify-content: center;
}

.project-links a:hover {
  background: var(--md-sys-color-primary);
  color: var(--md-sys-color-on-primary);
  transform: translateY(-2px);
}

.loading-skeleton {
  background: linear-gradient(90deg, var(--md-sys-color-surface-variant) 25%, var(--md-sys-color-surface-container-high) 50%, var(--md-sys-color-surface-variant) 75%);
  background-size: 200% 100%;
  animation: loading 1.5s infinite;
  border-radius: 8px;
}

@keyframes loading {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

.skeleton-title {
  height: 24px;
  margin-bottom: 12px;
}

.skeleton-text {
  height: 16px;
  margin-bottom: 8px;
}

.skeleton-text:last-child {
  width: 60%;
}

.contact {
  background-color: var(--md-sys-color-surface);
  color: var(--md-sys-color-on-surface);
  padding: 4rem 1rem;
  text-align: center;
}

.social-links {
  display: flex;
  justify-content: center;
  gap: 2rem;
  margin-top: 2rem;
}

.social-link {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--md-sys-color-on-surface);
  text-decoration: none;
  transition: all 0.3s ease;
  padding: 0.8rem 1.5rem;
  background: var(--md-sys-color-surface-container);
  border-radius: 12px;
}

.social-link:hover {
  color: var(--md-sys-color-primary);
  background: var(--md-sys-color-surface-container-high);
  transform: translateY(-3px);
}

footer {
  background-color: var(--md-sys-color-surface-container);
  padding: 1rem;
  text-align: center;
  color: var(--md-sys-color-on-surface);
  margin-top: 0;
}

@media (max-width: 768px) {
  .hamburger {
    display: flex;
  }

  .nav-links {
    display: flex;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--md-sys-color-surface-container);
    flex-direction: column;
    padding: 16px;
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    transition: all var(--md-motion-duration-medium) var(--md-motion-easing-emphasized);
    border-bottom: 1px solid var(--md-sys-color-outline-variant);
  }

  .nav-links.active {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }

  .nav-links li {
    margin: 8px 0;
  }

  .hero h1 {
    font-size: 2.5rem;
  }
  
  .projects-controls {
    flex-direction: column;
    align-items: center;
  }
  
  .project-grid {
    grid-template-columns: 1fr;
  }

  .social-links {
    flex-direction: column;
    gap: 1rem;
    align-items: center;
  }
  
  .social-link {
    width: 100%;
    max-width: 300px;
    justify-content: center;
  }
  
  .dropdown-content {
    position: relative;
    display: block;
    margin-top: 8px;
    transform: none;
    left: auto;
    box-shadow: none;
    background: var(--md-sys-color-surface-container-high);
  }
}

.history {
  padding: 4rem 1rem;
  background: var(--md-sys-color-surface-container);
  margin-top: 2rem;
}

.history-content {
  max-width: 800px;
  margin: 0 auto;
  text-align: center;
}

.timeline-item {
  margin-bottom: 2rem;
  padding: 2rem;
  background: var(--md-sys-color-surface-container);
  border-radius: 15px;
  backdrop-filter: blur(var(--blur-amount));
}

.timeline-item h3 {
  color: var(--md-sys-color-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  margin-bottom: 1rem;
}

.history-description {
  padding: 1rem;
  background: var(--md-sys-color-surface-container);
  border-radius: 10px;
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  text-align: left;
  margin-top: 2rem;
}

.history-description i {
  color: var(--md-sys-color-secondary);
  font-size: 1.5rem;
  margin-top: 0.2rem;
}

@media (max-width: 768px) {
  .history-content {
    padding: 0 1rem;
  }
  
  .history-description {
    flex-direction: column;
    align-items: center;
    text-align: center;
  }
}

.dropdown {
  position: relative;
  display: inline-block;
}

.dropdown-toggle {
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.dropdown-content {
  display: none;
  position: absolute;
  background: var(--md-sys-color-surface-container);
  min-width: 200px;
  border-radius: 8px;
  padding: 1rem;
  z-index: 1;
  top: 100%;
  left: 50%;
  transform: translateX(-50%);
  margin-top: 0.5rem;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
}

.dropdown-content p {
  color: var(--md-sys-color-on-surface);
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem;
}

.dropdown:hover .dropdown-content {
  display: block;
  animation: fadeIn 0.3s ease-out;
}