:root {
  --bg-primary: #000000;
  --bg-secondary: #0a0a0a;
  --text-primary: #ffffff;
  --text-secondary: #b0b0b0;
  --accent-green: #4a9eff;
  --accent-cyan: #00d9ff;
  --border-color: #333333;
  --card-bg: #0f0f0f;
}

/* Light theme variables */
body[data-theme="light"] {
  --bg-primary: #ffffff;
  --bg-secondary: #f5f5f5;
  --text-primary: #000000;
  --text-secondary: #4a4a4a;
  --accent-green: #2563eb;
  --accent-cyan: #0891b2;
  --border-color: #e0e0e0;
  --card-bg: #fafafa;
}

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

body {
  font-family: 'IBM Plex Mono', monospace;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  position: relative;
  transition: background-color 0.3s ease, color 0.3s ease;
}

/* Grain texture overlay */
.grain {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  opacity: 0.03;
  z-index: 1000;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 400 400' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noiseFilter'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='4' numOctaves='4' /%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noiseFilter)' /%3E%3C/svg%3E");
}

/* Tooltip styles */
.tooltip {
  position: absolute;
  background: #3a3a3a;
  color: #ffffff;
  padding: 8px 16px;
  border-radius: 4px;
  font-size: 0.85rem;
  font-weight: 600;
  pointer-events: none;
  opacity: 0;
  transform: translateY(-5px);
  transition: opacity 0.3s ease, transform 0.3s ease;
  z-index: 10000;
  white-space: nowrap;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.4);
}

.tooltip.show {
  opacity: 1;
  transform: translateY(0);
}

/* Site Settings Dropdown */
.site-settings {
  position: fixed;
  top: 20px;
  left: 20px;
  z-index: 9999;
}

.settings-toggle {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 16px;
  background: var(--card-bg);
  border: 2px solid var(--border-color);
  color: var(--text-primary);
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  cursor: pointer;
  transition: all 0.3s ease;
  border-radius: 4px;
}

.settings-toggle:hover {
  border-color: var(--accent-green);
  box-shadow: 0 0 20px rgba(74, 158, 255, 0.3);
}

.settings-toggle svg {
  transition: transform 0.3s ease;
}

.settings-toggle:hover svg {
  transform: rotate(90deg);
}

.settings-dropdown {
  position: absolute;
  top: calc(100% + 10px);
  left: 0;
  min-width: 250px;
  background: var(--card-bg);
  border: 2px solid var(--border-color);
  border-radius: 4px;
  padding: 15px;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-10px);
  transition: all 0.3s ease;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
}

.settings-dropdown.show {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.settings-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 20px;
}

.settings-label {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-primary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.theme-toggle-inline {
  display: flex;
  align-items: center;
  gap: 10px;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 5px;
  transition: all 0.3s ease;
}

.toggle-track {
  width: 50px;
  height: 26px;
  background: var(--border-color);
  border-radius: 13px;
  position: relative;
  transition: all 0.3s ease;
}

.theme-toggle-inline:hover .toggle-track {
  background: var(--accent-green);
}

.toggle-thumb {
  width: 20px;
  height: 20px;
  background: var(--text-primary);
  border-radius: 50%;
  position: absolute;
  top: 3px;
  left: 3px;
  transition: all 0.3s ease;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

body[data-theme="light"] .toggle-thumb {
  transform: translateX(24px);
}

.theme-text {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-secondary);
  min-width: 45px;
}

/* Adjust grain for light theme */
body[data-theme="light"] .grain {
  opacity: 0.02;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 40px 20px;
  position: relative;
}

/* Header Styles */
header {
  padding: 80px 0;
  border-bottom: 2px solid var(--border-color);
  margin-bottom: 80px;
  position: relative;
  animation: slideDown 0.8s ease-out;
}

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

.header-content {
  text-align: center;
}

h1 {
  font-family: 'Space Mono', monospace;
  font-size: clamp(2.5rem, 8vw, 5rem);
  font-weight: 700;
  letter-spacing: 0.05em;
  margin-bottom: 20px;
  position: relative;
  display: inline-block;
  color: var(--text-primary);
  text-shadow: 0 0 20px rgba(74, 158, 255, 0.4);
  transition: text-shadow 0.3s ease;
}

body[data-theme="light"] h1 {
  text-shadow: 0 0 20px rgba(37, 99, 235, 0.3);
}

/* Glitch effect on hover */
.glitch {
  position: relative;
  cursor: default;
}

.glitch:hover::before,
.glitch:hover::after {
  content: attr(data-text);
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  opacity: 0.8;
}

.glitch:hover::before {
  animation: glitch-1 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94) both infinite;
  color: var(--accent-cyan);
  z-index: -1;
}

.glitch:hover::after {
  animation: glitch-2 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94) reverse both infinite;
  color: var(--accent-green);
  z-index: -2;
}

@keyframes glitch-1 {
  0%, 100% { transform: translate(0); }
  20% { transform: translate(-2px, 2px); }
  40% { transform: translate(-2px, -2px); }
  60% { transform: translate(2px, 2px); }
  80% { transform: translate(2px, -2px); }
}

@keyframes glitch-2 {
  0%, 100% { transform: translate(0); }
  20% { transform: translate(2px, -2px); }
  40% { transform: translate(2px, 2px); }
  60% { transform: translate(-2px, -2px); }
  80% { transform: translate(-2px, 2px); }
}

.subtitle-wrapper {
  margin-bottom: 30px;
  animation: fadeIn 1s ease-out 0.3s both;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.subtitle {
  font-size: clamp(1rem, 2.5vw, 1.3rem);
  color: var(--text-secondary);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  margin-bottom: 5px;
}

.dot {
  color: #0066cc;
  font-weight: 700;
  font-size: 1.2em;
  margin: 0 8px;
}

.university {
  font-size: clamp(0.9rem, 2vw, 1.1rem);
  color: var(--text-secondary);
  letter-spacing: 0.05em;
}

/* Header Links */
.header-links {
  display: flex;
  gap: 20px;
  justify-content: center;
  flex-wrap: wrap;
  animation: fadeIn 1s ease-out 0.5s both;
}

.link-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  background: var(--card-bg);
  border: 2px solid var(--border-color);
  color: var(--text-primary);
  text-decoration: none;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-size: 0.9rem;
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}

.link-btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(74, 158, 255, 0.2), transparent);
  transition: left 0.5s ease;
}

.link-btn:hover::before {
  left: 100%;
}

.link-btn:hover {
  border-color: var(--accent-green);
  box-shadow: 0 0 20px rgba(74, 158, 255, 0.3);
  transform: translateY(-2px);
}

.link-btn svg {
  transition: transform 0.3s ease;
}

.link-btn:hover svg {
  transform: scale(1.1);
}

/* Section Styles */
section {
  margin-bottom: 100px;
  animation: fadeInUp 0.8s ease-out both;
  animation-delay: 0.7s;
}

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

.section-title {
  font-family: 'Space Mono', monospace;
  font-size: clamp(1.8rem, 4vw, 2.5rem);
  font-weight: 700;
  margin-bottom: 40px;
  letter-spacing: 0.05em;
  color: var(--text-primary);
  position: relative;
  display: inline-block;
}

.bracket {
  color: #0066cc;
  font-weight: 700;
}

/* About Section */
.about-content {
  max-width: 800px;
}

.about-text {
  font-size: clamp(1rem, 2vw, 1.2rem);
  line-height: 1.8;
  color: var(--text-secondary);
  padding: 30px;
  background: var(--card-bg);
  border-left: 4px solid var(--accent-green);
  position: relative;
}

.about-text::before {
  content: '>';
  position: absolute;
  left: 10px;
  top: 30px;
  color: var(--accent-green);
  font-weight: 700;
}

/* Projects Section */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 30px;
}

.project-card {
  background: var(--card-bg);
  border: 2px solid var(--border-color);
  padding: 30px;
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}

.project-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--accent-cyan), transparent);
  transition: left 0.6s ease;
}

.project-card:hover::before {
  left: 100%;
}

.project-card:hover {
  border-color: var(--accent-cyan);
  transform: translateY(-5px);
  box-shadow: 0 10px 40px rgba(0, 217, 255, 0.2);
}

.project-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 15px;
}

.project-title {
  font-family: 'Space Mono', monospace;
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: 0.05em;
}

.project-tag {
  font-size: 0.75rem;
  padding: 4px 12px;
  background: var(--accent-green);
  color: var(--bg-primary);
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.project-description {
  color: var(--text-secondary);
  margin-bottom: 20px;
  line-height: 1.6;
  font-size: 0.95rem;
}

.project-link {
  display: inline-block;
  color: var(--accent-cyan);
  text-decoration: none;
  font-weight: 600;
  letter-spacing: 0.05em;
  transition: all 0.3s ease;
  position: relative;
}

.project-link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent-cyan);
  transition: width 0.3s ease;
}

.project-link:hover::after {
  width: 100%;
}

.project-link:hover {
  text-shadow: 0 0 10px rgba(0, 217, 255, 0.5);
}

/* Footer */
footer {
  border-top: 2px solid var(--border-color);
  padding: 60px 0 40px;
  margin-top: 100px;
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 40px;
}

.footer-section {
  flex: 1;
  min-width: 250px;
}

.footer-title {
  font-family: 'Space Mono', monospace;
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 15px;
  letter-spacing: 0.1em;
  color: var(--accent-green);
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-links a {
  color: var(--text-secondary);
  text-decoration: none;
  transition: all 0.3s ease;
  font-size: 0.95rem;
}

.footer-links a:hover {
  color: var(--accent-cyan);
  padding-left: 10px;
}

.footer-copy,
.footer-location {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin: 5px 0;
}

.footer-copy {
  color: var(--text-primary);
  font-weight: 600;
}

/* Responsive Design */
@media (max-width: 768px) {
  .container {
    padding: 20px;
  }

  header {
    padding: 40px 0;
    margin-bottom: 40px;
  }

  section {
    margin-bottom: 60px;
  }

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

  .footer-content {
    flex-direction: column;
  }

  .about-text {
    padding: 20px;
    padding-left: 25px;
  }

  .site-settings {
    top: 15px;
    left: 15px;
  }

  .settings-toggle {
    padding: 8px 12px;
    font-size: 0.8rem;
  }

  .settings-toggle span {
    display: none;
  }

  .settings-dropdown {
    min-width: 220px;
  }
}

/* Selection color */
::selection {
  background: var(--accent-green);
  color: var(--bg-primary);
}

::-moz-selection {
  background: var(--accent-green);
  color: var(--bg-primary);
}

/* Scrollbar */
::-webkit-scrollbar {
  width: 10px;
}

::-webkit-scrollbar-track {
  background: var(--bg-primary);
}

::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--accent-green);
}

body[data-theme="light"] ::-webkit-scrollbar-thumb {
  background: #d0d0d0;
}

body[data-theme="light"] ::-webkit-scrollbar-thumb:hover {
  background: var(--accent-green);
}