/* ===== CSS Custom Properties ===== */
:root {
  --bg: #0a0a0f;
  --surface: #12121a;
  --surface-hover: #1a1a24;
  --text: #f0f0f5;
  --text-secondary: #a0a0b0;
  --muted: #707080;
  --accent: #6366f1;
  --accent-2: #8b5cf6;
  --accent-glow: rgba(99, 102, 241, 0.4);
  --success: #10b981;
  --warning: #f59e0b;
  --radius: 16px;
  --radius-sm: 8px;
  --radius-lg: 24px;
  --max-width: 1140px;
  --glass: rgba(255, 255, 255, 0.03);
  --glass-border: rgba(255, 255, 255, 0.06);
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.5);
  --transition-fast: 0.15s ease;
  --transition-normal: 0.25s ease;
  --transition-slow: 0.4s ease;
}

/* Light theme variables */
.theme-light {
  --bg: #fafbfc;
  --surface: #ffffff;
  --surface-hover: #f5f5f8;
  --text: #1a1a2e;
  --text-secondary: #4a4a5a;
  --muted: #6a6a7a;
  --accent: #5b4cff;
  --accent-2: #7c3aed;
  --accent-glow: rgba(91, 76, 255, 0.2);
  --glass: rgba(0, 0, 0, 0.02);
  --glass-border: rgba(0, 0, 0, 0.06);
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.12);
}

/* ===== Base Styles ===== */
*, *::before, *::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

html, body {
  height: 100%;
}

body {
  font-family: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  margin: 0;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

/* Animated gradient background */
body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: 
    radial-gradient(ellipse 80% 50% at 20% 40%, rgba(99, 102, 241, 0.08), transparent),
    radial-gradient(ellipse 60% 40% at 80% 20%, rgba(139, 92, 246, 0.06), transparent),
    radial-gradient(ellipse 50% 30% at 50% 80%, rgba(99, 102, 241, 0.04), transparent);
  pointer-events: none;
  z-index: -1;
  animation: gradientShift 20s ease-in-out infinite alternate;
}

@keyframes gradientShift {
  0% { opacity: 1; transform: scale(1); }
  100% { opacity: 0.8; transform: scale(1.05); }
}

.container {
  max-width: var(--max-width);
  padding-left: 1.5rem;
  padding-right: 1.5rem;
}

/* ===== Header & Navigation ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  background: rgba(10, 10, 15, 0.8);
  border-bottom: 1px solid var(--glass-border);
  transition: background var(--transition-normal), box-shadow var(--transition-normal);
}

.theme-light .site-header {
  background: rgba(250, 251, 252, 0.85);
}

.site-header .brand {
  color: var(--text);
  text-decoration: none;
  transition: transform var(--transition-fast);
}

.site-header .brand:hover {
  transform: translateY(-2px);
}

.brand-mark {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  color: white;
  font-size: 22px;
  box-shadow: 0 4px 16px var(--accent-glow);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.brand:hover .brand-mark {
  transform: rotate(-5deg) scale(1.05);
  box-shadow: 0 6px 24px var(--accent-glow);
}

.brand-name {
  font-weight: 700;
  font-size: 1.1rem;
  letter-spacing: -0.02em;
}

.brand-sub {
  font-size: 0.75rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.nav-link {
  color: var(--text-secondary);
  text-decoration: none;
  padding: 0.5rem 1rem;
  border-radius: var(--radius-sm);
  font-weight: 500;
  font-size: 0.9rem;
  transition: color var(--transition-fast), background var(--transition-fast);
}

.nav-link:hover {
  color: var(--text);
  background: var(--glass);
}

.btn-ghost {
  background: var(--glass);
  border: 1px solid var(--glass-border);
  color: var(--text);
  padding: 0.5rem 0.75rem;
  border-radius: var(--radius-sm);
  font-size: 1.2rem;
  cursor: pointer;
  transition: background var(--transition-fast), transform var(--transition-fast);
}

.btn-ghost:hover {
  background: var(--surface-hover);
  transform: rotate(15deg);
}

/* ===== Hero Section ===== */
.hero {
  min-height: 70vh;
  display: flex;
  align-items: center;
}

.hero h1 {
  font-weight: 800;
  font-size: clamp(2rem, 5vw, 3.5rem);
  line-height: 1.15;
  letter-spacing: -0.03em;
  background: linear-gradient(135deg, var(--text) 40%, var(--accent) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

#blinker {
  display: inline-block;
  margin-left: 4px;
  color: var(--accent);
  -webkit-text-fill-color: var(--accent);
  animation: blink 1s step-end infinite;
}

@keyframes blink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0; }
}

.hero .lead {
  font-size: clamp(1rem, 2vw, 1.25rem);
  color: var(--text-secondary);
  max-width: 540px;
}

.hero-visual {
  background: linear-gradient(145deg, var(--surface), var(--bg));
  border-radius: var(--radius);
  border: 1px solid var(--glass-border);
  font-family: 'SF Mono', 'Fira Code', 'Roboto Mono', monospace;
  color: var(--text-secondary);
  font-size: 0.9rem;
  position: relative;
  overflow: hidden;
}

.hero-visual::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 32px;
  background: var(--glass);
  border-bottom: 1px solid var(--glass-border);
  border-radius: var(--radius) var(--radius) 0 0;
}

.hero-visual::after {
  content: '● ● ●';
  position: absolute;
  top: 8px;
  left: 16px;
  font-size: 10px;
  letter-spacing: 4px;
  color: var(--muted);
}

.hero-visual pre {
  margin: 0;
  padding-top: 2.5rem;
}

.hero-visual code {
  color: var(--text-secondary);
}

/* ===== Buttons ===== */
.btn-primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  border: none;
  color: white;
  font-weight: 600;
  padding: 0.875rem 1.75rem;
  border-radius: var(--radius);
  font-size: 0.95rem;
  box-shadow: 0 4px 16px var(--accent-glow);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px var(--accent-glow);
  color: white;
}

.btn-outline-light {
  background: transparent;
  border: 2px solid var(--glass-border);
  color: var(--text);
  font-weight: 600;
  padding: 0.8rem 1.75rem;
  border-radius: var(--radius);
  font-size: 0.95rem;
  transition: all var(--transition-fast);
}

.btn-outline-light:hover {
  background: var(--glass);
  border-color: var(--accent);
  color: var(--text);
}

/* ===== Section Styles ===== */
.section-title {
  font-weight: 700;
  font-size: 1.75rem;
  letter-spacing: -0.02em;
  margin-bottom: 0.5rem;
  position: relative;
  display: inline-block;
}

.section-title::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 40px;
  height: 3px;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  border-radius: 2px;
}

/* ===== Project Cards ===== */
.projects .card {
  background: var(--surface);
  border-radius: var(--radius);
  border: 1px solid var(--glass-border);
  padding: 1.5rem;
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.projects .card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  opacity: 0;
  transition: opacity var(--transition-normal);
}

.projects .card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(99, 102, 241, 0.3);
}

.projects .card:hover::before {
  opacity: 1;
}

.projects .card h3 {
  font-weight: 600;
  font-size: 1.15rem;
  color: var(--text);
  margin-bottom: 0.25rem;
}

.project-meta {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

.projects .card a {
  color: var(--accent);
  font-weight: 600;
  font-size: 0.9rem;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.projects .card a::after {
  content: '→';
  transition: transform var(--transition-fast);
}

.projects .card:hover a::after {
  transform: translateX(4px);
}

/* Status badges */
.status {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  padding: 0.375rem 0.75rem;
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.status::before {
  content: '';
  width: 6px;
  height: 6px;
  border-radius: 50%;
}

.status.live {
  background: rgba(16, 185, 129, 0.12);
  color: var(--success);
}

.status.live::before {
  background: var(--success);
  box-shadow: 0 0 8px var(--success);
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

.status.exp {
  background: rgba(245, 158, 11, 0.12);
  color: var(--warning);
}

.status.exp::before {
  background: var(--warning);
}

.status.arch {
  background: var(--glass);
  color: var(--muted);
}

.status.arch::before {
  background: var(--muted);
}

/* ===== About & Profile Sections ===== */
.about, .profile {
  position: relative;
}

.about p, .profile p {
  color: var(--text-secondary);
  max-width: 720px;
  font-size: 1.05rem;
  line-height: 1.7;
}

.avatar {
  width: 120px !important;
  height: 120px !important;
  font-size: 2.5rem !important;
  background: linear-gradient(135deg, var(--accent), var(--accent-2)) !important;
  box-shadow: 0 8px 24px var(--accent-glow);
  border: 3px solid var(--surface);
  transition: transform var(--transition-fast);
}

.avatar:hover {
  transform: scale(1.05) rotate(-5deg);
}

.profile h3 {
  font-weight: 700;
  font-size: 1.5rem;
  color: var(--text);
}

.profile strong {
  color: var(--accent);
}

/* ===== Lab Notes ===== */
.lab-notes {
  background: var(--glass);
  border-radius: var(--radius-lg);
  padding: 2rem !important;
  border: 1px solid var(--glass-border);
}

.lab-note {
  padding: 1rem 1.25rem;
  border-radius: var(--radius);
  background: var(--surface);
  border: 1px solid var(--glass-border);
  margin-bottom: 0.75rem;
  color: var(--text-secondary);
  font-size: 0.9rem;
  transition: all var(--transition-fast);
  position: relative;
  padding-left: 2.5rem;
}

.lab-note::before {
  content: '📝';
  position: absolute;
  left: 1rem;
  top: 50%;
  transform: translateY(-50%);
  font-size: 0.85rem;
}

.lab-note:hover {
  background: var(--surface-hover);
  border-color: var(--accent);
  transform: translateX(4px);
}

.note-text {
  display: block;
}

.note-date {
  display: block;
  font-size: 0.8rem;
  color: var(--muted);
  margin-top: 0.375rem;
}

.notes-toggle-container {
  text-align: center;
  margin-top: 1rem;
}

.btn-see-more {
  background: var(--glass);
  border: 1px solid var(--glass-border);
  color: var(--accent);
  padding: 0.625rem 1.25rem;
  border-radius: var(--radius);
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-see-more:hover {
  background: var(--surface-hover);
  border-color: var(--accent);
  transform: translateY(-2px);
}

/* ===== Social Links ===== */
.socials {
  margin-top: 2rem;
}

.social-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  color: var(--text-secondary);
  text-decoration: none;
  border-radius: var(--radius);
  background: var(--glass);
  border: 1px solid var(--glass-border);
  transition: all var(--transition-fast);
}

.social-link:hover {
  color: var(--text);
  background: var(--surface-hover);
  border-color: var(--accent);
  transform: translateY(-3px);
  box-shadow: 0 6px 16px var(--accent-glow);
}

/* ===== Footer ===== */
.site-footer {
  border-top: 1px solid var(--glass-border);
  background: var(--glass);
}

.site-footer .small {
  color: var(--text-secondary);
}

.site-footer .text-muted {
  color: var(--text-secondary) !important;
}

.site-footer a {
  color: var(--accent);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.site-footer a:hover {
  color: var(--accent-2);
}

/* ===== Utilities ===== */
.visually-hidden {
  position: absolute !important;
  height: 1px;
  width: 1px;
  overflow: hidden;
  clip: rect(1px, 1px, 1px, 1px);
  white-space: nowrap;
}

/* ===== Reveal Animations ===== */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s cubic-bezier(0.16, 1, 0.3, 1), 
              transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

.reveal.visible {
  opacity: 1;
  transform: none;
}

/* Staggered animation for cards */
.reveal:nth-child(1) { transition-delay: 0.05s; }
.reveal:nth-child(2) { transition-delay: 0.1s; }
.reveal:nth-child(3) { transition-delay: 0.15s; }
.reveal:nth-child(4) { transition-delay: 0.2s; }
.reveal:nth-child(5) { transition-delay: 0.25s; }

/* ===== Mobile Navigation ===== */
.mobile-nav-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text);
  padding: 0.5rem;
  cursor: pointer;
}

.mobile-nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text);
  margin: 5px 0;
  border-radius: 2px;
  transition: all var(--transition-fast);
}

/* ===== Responsive Styles ===== */

/* Tablet and below */
@media (max-width: 991px) {
  .hero {
    min-height: auto;
    padding-top: 2rem;
    padding-bottom: 2rem;
  }
  
  .hero h1 {
    font-size: 2.25rem;
  }
  
  .section-title {
    font-size: 1.5rem;
  }
}

/* Mobile styles */
@media (max-width: 767px) {
  .container {
    padding-left: 1rem;
    padding-right: 1rem;
  }
  
  .site-header {
    padding: 0.75rem 0;
  }
  
  .brand-mark {
    width: 40px;
    height: 40px;
    font-size: 18px;
  }
  
  .brand-name {
    font-size: 1rem;
  }
  
  .brand-sub {
    display: none;
  }
  
  .mobile-nav-toggle {
    display: block;
  }
  
  nav.d-none.d-md-block {
    display: none !important;
  }
  
  .hero {
    text-align: center;
    padding-top: 1.5rem;
  }
  
  .hero h1 {
    font-size: 1.75rem;
    line-height: 1.25;
  }
  
  .hero .lead {
    font-size: 1rem;
    margin-left: auto;
    margin-right: auto;
  }
  
  .hero .mt-4 {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
  }
  
  .hero .btn {
    width: 100%;
    margin: 0 !important;
  }
  
  .hero-visual {
    display: none;
  }
  
  .projects .card {
    padding: 1.25rem;
  }
  
  .profile .row {
    text-align: center;
  }
  
  .profile .col-auto {
    margin-bottom: 1.5rem;
    display: flex;
    justify-content: center;
    width: 100%;
  }
  
  .profile .row {
    flex-direction: column;
    text-align: center;
  }
  
  .avatar {
    width: 100px !important;
    height: 100px !important;
    font-size: 2rem !important;
  }
  
  .profile h3 {
    font-size: 1.25rem;
  }
  
  .lab-notes {
    padding: 1.25rem !important;
    border-radius: var(--radius);
  }
  
  .lab-note {
    padding: 0.875rem 1rem 0.875rem 2.25rem;
    font-size: 0.85rem;
  }
  
  .lab-note::before {
    left: 0.75rem;
  }
  
  .socials .d-flex {
    justify-content: center;
  }
  
  .social-link {
    width: 48px;
    height: 48px;
  }
  
  .site-footer .d-flex {
    flex-direction: column;
    text-align: center;
    gap: 0.75rem;
  }
  
  .section-title::after {
    left: 50%;
    transform: translateX(-50%);
  }
  
  .about, .profile, .projects, .lab-notes, .socials {
    text-align: center;
  }
  
  .about p {
    text-align: left;
  }
}

/* Small mobile */
@media (max-width: 375px) {
  .hero h1 {
    font-size: 1.5rem;
  }
  
  .btn-primary, .btn-outline-light {
    padding: 0.75rem 1.25rem;
    font-size: 0.875rem;
  }
}

/* Large screens */
@media (min-width: 1200px) {
  .container {
    max-width: 1200px;
  }
  
  .hero h1 {
    font-size: 3.75rem;
  }
  
  .hero .lead {
    font-size: 1.35rem;
  }
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  
  html {
    scroll-behavior: auto;
  }
}

/* ===== Additional Component Styles ===== */

/* Hero badge */
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 1rem;
  background: var(--glass);
  border: 1px solid var(--glass-border);
  border-radius: 999px;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-secondary);
}

/* Code syntax highlighting in hero */
.code-comment { color: var(--muted); }
.code-keyword { color: var(--accent); }
.code-method { color: #a78bfa; }
.code-string { color: #34d399; }

/* Section subtitle */
.section-subtitle {
  color: var(--text-secondary);
  font-size: 0.95rem;
  margin-top: 0.25rem;
}

/* Philosophy values */
.philosophy-values {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}

.value-item {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.625rem 1rem;
  background: var(--glass);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  font-size: 0.9rem;
  color: var(--text-secondary);
  transition: all var(--transition-fast);
}

.value-item:hover {
  background: var(--surface-hover);
  border-color: var(--accent);
  transform: translateY(-2px);
}

.value-icon {
  font-size: 1.1rem;
}

/* Profile card */
.profile-card {
  background: var(--glass);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  padding: 2rem;
}

.profile-role {
  color: var(--accent);
  font-weight: 500;
  font-size: 0.95rem;
  margin-bottom: 0.5rem !important;
}

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

.profile-tag {
  display: inline-block;
  padding: 0.375rem 0.875rem;
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.1), rgba(139, 92, 246, 0.1));
  border: 1px solid rgba(99, 102, 241, 0.2);
  border-radius: 999px;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--accent);
}

/* Mobile Navigation */
.mobile-nav {
  display: none;
  flex-direction: column;
  padding: 0 1rem 1rem;
  background: rgba(10, 10, 15, 0.95);
  border-bottom: 1px solid var(--glass-border);
}

.theme-light .mobile-nav {
  background: rgba(250, 251, 252, 0.98);
}

.mobile-nav.active {
  display: flex;
}

.mobile-nav-link {
  color: var(--text);
  text-decoration: none;
  padding: 0.875rem 1rem;
  border-radius: var(--radius-sm);
  font-weight: 500;
  transition: background var(--transition-fast);
}

.mobile-nav-link:hover {
  background: var(--glass);
  color: var(--accent);
}

/* Mobile nav toggle animation */
.mobile-nav-toggle.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.mobile-nav-toggle.active span:nth-child(2) {
  opacity: 0;
}

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

/* Primary button with icon */
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.btn-primary svg {
  transition: transform var(--transition-fast);
}

.btn-primary:hover svg {
  transform: translateX(4px);
}

/* ===== Light Theme Specific Overrides ===== */
.theme-light .hero h1 {
  background: linear-gradient(135deg, var(--text) 40%, var(--accent) 100%);
  -webkit-background-clip: text;
  background-clip: text;
}

.theme-light .projects .card {
  box-shadow: var(--shadow-sm);
}

.theme-light .projects .card:hover {
  box-shadow: var(--shadow-lg);
}

.theme-light .profile-card,
.theme-light .lab-notes {
  background: var(--surface);
  box-shadow: var(--shadow-sm);
}

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

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

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

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

/* ===== Selection Styling ===== */
::selection {
  background: var(--accent);
  color: white;
}

/* ===== Focus Styles for Accessibility ===== */
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

button:focus-visible,
a:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* ===== Project Card Additional Styles ===== */
.project-link {
  color: var(--accent);
  font-weight: 600;
  font-size: 0.9rem;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  transition: gap var(--transition-fast);
}

.project-link::after {
  content: '→';
  transition: transform var(--transition-fast);
}

.projects .card:hover .project-link::after {
  transform: translateX(4px);
}

.project-link:hover {
  color: var(--accent-2);
}