@import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@400;500;600;700&display=swap');

.font-space {
  font-family: 'Space Grotesk', sans-serif;
}
/* stylelint-disable-next-line at-rule-no-unknown */
@tailwind base;
/* stylelint-disable-next-line at-rule-no-unknown */
@tailwind components;
/* stylelint-disable-next-line at-rule-no-unknown */
@tailwind utilities;
:root {
  /* === CORE BRAND COLORS === */
  --primary: #0a0e27;
  --primary-900: #050712;
  --primary-800: #070b1a;
  /* removed duplicate of --primary; use semantic scale if needed */
  --primary-600: #0d1234;
  --primary-500: #101641;
  --primary-400: #13194e;
  --primary-300: #161d5b;
  --primary-200: #192168;
  --primary-100: #1c2475;

  --secondary: #151931;
  --secondary-dark: #0e1124;
  --secondary-light: #1a1f3d;

  /* === Accent System === */
  --accent: #00d4ff;
  --accent-bright: #00e8ff;
  --accent-dim: #00a8cc;
  --accent-glow: rgba(0, 212, 255, 0.6);

  --accent-secondary: #7c3aed;
  --accent-secondary-bright: #8b5cf6;
  --accent-secondary-dim: #6d28d9;
  --accent-secondary-glow: rgba(124, 58, 237, 0.6);

  --accent-tertiary: #06ffa5;
  --accent-tertiary-bright: #10ffb0;
  --accent-tertiary-dim: #00cc84;
  --accent-tertiary-glow: rgba(6, 255, 165, 0.6);

  /* === Gradient System === */
  --gradient-primary: linear-gradient(135deg, #00d4ff 0%, #7c3aed 100%);
  --gradient-secondary: linear-gradient(135deg, #7c3aed 0%, #06ffa5 100%);
  --gradient-tertiary: linear-gradient(135deg, #06ffa5 0%, #00d4ff 100%);
  --gradient-accent: linear-gradient(135deg, #00d4ff 0%, #7c3aed 50%, #06ffa5 100%);
  --gradient-spectrum: linear-gradient(
    135deg,
    #00d4ff 0%,
    #7c3aed 25%,
    #06ffa5 50%,
    #ff6b6b 75%,
    #ffd93d 100%
  );
  --gradient-gold: linear-gradient(135deg, #ffd700 0%, #ffed4e 50%, #ffa500 100%);
  --gradient-emerald: linear-gradient(135deg, #10b981 0%, #059669 50%, #047857 100%);

  /* === Radial Gradients === */
  --gradient-radial-primary: radial-gradient(
    circle at center,
    rgba(0, 212, 255, 0.15) 0%,
    transparent 70%
  );
  --gradient-radial-secondary: radial-gradient(
    circle at center,
    rgba(124, 58, 237, 0.15) 0%,
    transparent 70%
  );
  --gradient-radial-tertiary: radial-gradient(
    circle at center,
    rgba(6, 255, 165, 0.15) 0%,
    transparent 70%
  );
  --gradient-radial-glow: radial-gradient(
    circle at center,
    rgba(0, 212, 255, 0.3) 0%,
    rgba(124, 58, 237, 0.2) 50%,
    transparent 100%
  );

  /* === Conic Gradients === */
  --gradient-conic: conic-gradient(
    from 0deg,
    var(--accent),
    var(--accent-secondary),
    var(--accent-tertiary),
    var(--accent)
  );
  --gradient-conic-accent: conic-gradient(
    from 0deg,
    #00d4ff,
    #7c3aed,
    #06ffa5,
    #ff6b6b,
    #ffd93d,
    #00d4ff
  );

  /* === Glass Morphism === */

  --glass-bg-heavy: rgba(15, 20, 35, 0.4);
  --glass-bg-medium: rgba(15, 20, 35, 0.6);
  --glass-bg-light: rgba(15, 20, 35, 0.8);
  --glass-border-thin: rgba(255, 255, 255, 0.02);

  --glass-border-light: rgba(255, 255, 255, 0.05);
  --glass-border-medium: rgba(255, 255, 255, 0.1);
  --glass-border-heavy: rgba(255, 255, 255, 0.15);

  /* === TYPOGRAPHY SYSTEM === */
  --text-primary: #ffffff;
  --text-secondary: #f8fafc;
  --text-muted: #e2e8f0;
  --text-dim: #cbd5e1;
  --text-ghost: #94a3b8;

  /* === Shadow Presets === */
  --shadow-glow-sm: 0 0 20px rgba(0, 212, 255, 0.2);
  --shadow-glow-md: 0 0 40px rgba(0, 212, 255, 0.3);
  --shadow-glow-lg: 0 0 60px rgba(0, 212, 255, 0.4);
  --shadow-glow-xl: 0 0 80px rgba(0, 212, 255, 0.5);
  --shadow-elevated: 0 25px 50px -12px rgba(0, 0, 0, 0.25), 0 0 40px rgba(0, 212, 255, 0.1);
  --shadow-deep: 0 35px 70px -15px rgba(0, 0, 0, 0.3), 0 0 60px rgba(124, 58, 237, 0.15);

  /* === Animation Timing === */
  --ease-smooth: cubic-bezier(0.16, 1, 0.3, 1);

  --ease-bounce: cubic-bezier(0.68, -0.55, 0.265, 1.55);
  --ease-elastic: cubic-bezier(0.68, -0.3, 0.32, 1.3);
  --ease-strong: cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

/* Base */
@layer base {
  /* Screen-reader-only utility (in case Tailwind's sr-only isn't present at runtime CSS split) */
  /* Use Tailwind's built-in sr-only utilities; remove custom duplicates */
  html {
    font-family:
      'Inter',
      -apple-system,
      BlinkMacSystemFont,
      'Segoe UI',
      system-ui,
      sans-serif;
    font-feature-settings:
      'liga' 1,
      'calt' 1,
      'cv11' 1,
      'ss01' 1;
    scroll-behavior: smooth;
    scroll-padding-top: 5rem;
    -webkit-tap-highlight-color: transparent;
    text-size-adjust: 100%;
  }

  body {
    background: var(--primary);
    background-image:
      radial-gradient(circle at 25% 25%, rgba(0, 212, 255, 0.03) 0%, transparent 50%),
      radial-gradient(circle at 75% 75%, rgba(124, 58, 237, 0.03) 0%, transparent 50%);
    color: var(--text-primary);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
    font-variant-ligatures: contextual;
    overflow-x: hidden;
    position: relative;
    min-height: 100vh;
  }

  /* Scrollbar */
  ::-webkit-scrollbar {
    width: 12px;
  }

  ::-webkit-scrollbar-track {
    background: linear-gradient(180deg, var(--primary) 0%, var(--secondary) 100%);
    border-radius: 6px;
  }

  ::-webkit-scrollbar-thumb {
    background: linear-gradient(180deg, var(--accent) 0%, var(--accent-secondary) 100%);
    border-radius: 6px;
    border: 2px solid var(--primary);
    box-shadow: inset 0 0 6px rgba(0, 212, 255, 0.3);
  }

  ::-webkit-scrollbar-thumb:hover {
    background: linear-gradient(
      180deg,
      var(--accent-bright) 0%,
      var(--accent-secondary-bright) 100%
    );
    box-shadow:
      inset 0 0 8px rgba(0, 212, 255, 0.5),
      0 0 10px rgba(0, 212, 255, 0.3);
  }

  /* Selection */
  ::selection {
    background: linear-gradient(135deg, var(--accent-glow), var(--accent-secondary-glow));
    color: #ffffff;
    text-shadow: 0 0 8px rgba(0, 0, 0, 0.3);
  }

  /* Focus States */
  :focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 3px;
    border-radius: 0.5rem;
    box-shadow: 0 0 0 4px rgba(0, 212, 255, 0.2);
  }

  /* Ensure consistent section spacing with better scroll padding */
  section {
    scroll-margin-top: 6rem; /* Increased from 5rem for better spacing */
  }

  @media (max-width: 768px) {
    section {
      scroll-margin-top: 5rem; /* Increased from 4rem for mobile */
    }
  }
}

/* ===============================================
   Components
   =============================================== */
@layer components {
  /* === ADVANCED GLASS MORPHISM === */
  .glass-card {
    background: rgba(15, 20, 35, 0.4);
    backdrop-filter: blur(40px) saturate(200%);
    -webkit-backdrop-filter: blur(40px) saturate(200%);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 1.5rem;
    position: relative;
    overflow: hidden;
    box-shadow:
      0 25px 50px -12px rgba(0, 0, 0, 0.25),
      inset 0 1px 0 rgba(255, 255, 255, 0.1);
  }

  .glass-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(
      90deg,
      transparent,
      rgba(255, 255, 255, 0.15) 20%,
      rgba(255, 255, 255, 0.15) 80%,
      transparent
    );
  }

  /* */
  /* ===============================================
   Navigation Classes
   =============================================== */
  /* Navigation */

  .nav-link {
    position: relative;
    color: var(--text-muted);
    font-weight: 500;
    transition: all 0.3s var(--ease-smooth);
    text-decoration: none;
    padding: 0.5rem 0;
    overflow: hidden;
  }

  .nav-link::before {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient-primary);
    transition: width 0.4s var(--ease-smooth);
  }

  .nav-link::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    background: radial-gradient(circle, rgba(0, 212, 255, 0.1) 0%, transparent 70%);
    transform: translate(-50%, -50%);
    transition: all 0.4s var(--ease-smooth);
    border-radius: 50%;
  }

  .nav-link:hover,
  .nav-link.active {
    color: var(--accent);
    text-shadow: 0 0 8px rgba(0, 212, 255, 0.5);
  }

  .nav-link:hover::before,
  .nav-link.active::before {
    width: 100%;
  }

  .nav-link:hover::after {
    width: 120%;
    height: 120%;
  }
  /* Mobile Menu States */
  #mobileMenu {
    transform: translateY(-100%);
    transition: transform 0.5s cubic-bezier(0.16, 1, 0.3, 1);
  }

  #mobileMenu.open {
    transform: translateY(0);
  }

  #menuToggle.open .menu-bar:nth-child(1) {
    transform: translateY(6px) rotate(45deg);
  }

  #menuToggle.open .menu-bar:nth-child(2) {
    opacity: 0;
  }
  /* Use rotate-slow keyframes; removed duplicate gradient-conic-rotate */
  .academic-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 0;
    border-bottom: 1px solid var(--glass-border-light);
  }

  .academic-item:last-child {
    border-bottom: none;
  }

  .academic-label {
    color: var(--text-muted);
    font-size: 0.875rem;
  }
  /* removed duplicate .btn-gradient rules (utility version above is canonical) */
  .academic-value {
    font-weight: 600;
    color: var(--text-secondary);
  }
  .gradient-conic-animated {
    background: conic-gradient(
      from 0deg at 50% 50%,
      var(--accent),
      var(--accent-secondary),
      var(--accent-tertiary),
      var(--accent)
    );
    animation: rotate-slow 10s linear infinite;
  }
  #menuToggle.open .menu-bar:nth-child(3) {
    transform: translateY(-6px) rotate(-45deg);
  }

  .menu-bar {
    transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  }
  /* Header Scroll State */
  #header {
    transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  }

  #header.scrolled {
    background: rgba(10, 14, 39, 0.95);
    backdrop-filter: blur(20px);
    box-shadow: 0 1px 0 rgba(255, 255, 255, 0.1);
  }
  .mobile-nav-link {
    color: var(--text-secondary);
    font-weight: 500;
    padding: 1rem 1.5rem;
    transition: all 0.3s var(--ease-smooth);
    text-decoration: none;
    display: block;
    border-radius: 0.75rem;
    position: relative;
    overflow: hidden;
    text-align: center;
  }

  .mobile-nav-link::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(0, 212, 255, 0.1), transparent);
    transition: left 0.4s var(--ease-smooth);
  }

  .mobile-nav-link:hover {
    color: var(--accent);
    background: var(--glass-bg-light);
    transform: translateX(8px);
  }

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

  /* === Buttons === */
  .btn-primary {
    display: inline-flex;
    align-items: center;
    padding: 1rem 2.5rem;
    background: var(--gradient-primary);
    color: white;
    font-weight: 600;
    border-radius: 1rem;
    transition: all 0.4s var(--ease-smooth);
    text-decoration: none;
    position: relative;
    overflow: hidden;
    box-shadow:
      0 8px 25px rgba(0, 212, 255, 0.3),
      inset 0 1px 0 rgba(255, 255, 255, 0.2);
  }

  .btn-primary::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
    transition: left 0.6s var(--ease-smooth);
  }

  .btn-primary:hover {
    transform: translateY(-3px) scale(1.02);
    box-shadow:
      0 15px 40px rgba(0, 212, 255, 0.4),
      inset 0 1px 0 rgba(255, 255, 255, 0.3);
  }

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

  .btn-glass {
    display: inline-flex;
    align-items: center;
    padding: 1rem 2.5rem;
    background: var(--glass-bg-medium);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border-medium);
    color: var(--text-secondary);
    font-weight: 600;
    border-radius: 1rem;
    transition: all 0.4s var(--ease-smooth);
    text-decoration: none;
    position: relative;
    overflow: hidden;
  }

  .btn-glass:hover {
    background: var(--glass-bg-heavy);
    border-color: var(--accent);
    color: var(--accent);
    transform: translateY(-3px);
    box-shadow:
      0 15px 40px rgba(0, 212, 255, 0.2),
      inset 0 0 20px rgba(0, 212, 255, 0.05);
  }

  /* Button interactions */
  .btn-primary:active {
    transform: translateY(-1px) scale(0.98);
  }

  .btn-glass:active {
    transform: translateY(-1px) scale(0.98);
  }

  /* === GRADIENT TEXT SYSTEM === */
  .gradient-text {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-weight: 700;
  }

  .gradient-text-secondary {
    background: var(--gradient-secondary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-weight: 700;
  }

  .gradient-text-tertiary {
    background: var(--gradient-tertiary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-weight: 700;
  }

  .gradient-text-animated {
    background: linear-gradient(
      45deg,
      var(--accent) 0%,
      var(--accent-secondary) 25%,
      var(--accent-tertiary) 50%,
      var(--accent) 75%,
      var(--accent-secondary) 100%
    );
    background-size: 300% 300%;
    animation: gradient-flow 8s ease infinite;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-weight: 700;
  }

  .gradient-text-emerald {
    background: var(--gradient-emerald);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-weight: 700;
  }

  /* Consolidated to gradient-text* background-clip system; removed color-only variants */
  /* merged .glass-card above */
  /* === Stat Cards === */
  .stat-card {
    background: var(--glass-bg-light);
    backdrop-filter: blur(30px) saturate(200%);
    -webkit-backdrop-filter: blur(30px) saturate(200%);
    border: 1px solid var(--glass-border-medium);
    border-radius: 1.5rem;
    padding: 2rem;
    text-align: center;
    transition: all 0.5s var(--ease-smooth);
    position: relative;
    overflow: hidden;
  }

  .stat-card::before {
    content: '';
    position: absolute;
    top: -2px;
    left: -2px;
    right: -2px;
    bottom: -2px;
    background: var(--gradient-conic);
    border-radius: inherit;
    opacity: 0;
    z-index: -1;
    transition: opacity 0.4s var(--ease-smooth);
    animation: rotate-slow 20s linear infinite;
  }

  .stat-card:hover {
    transform: translateY(-8px) scale(1.05);
    box-shadow: var(--shadow-deep);
  }

  .stat-card:hover::before {
    opacity: 0.7;
  }

  .stat-value {
    font-size: 3rem;
    font-weight: 900;
    line-height: 1;
    margin-bottom: 0.5rem;
  }

  .stat-label {
    color: var(--text-secondary);
    font-weight: 600;
    font-size: 1.1rem;
    margin-bottom: 0.25rem;
  }

  .stat-sublabel {
    color: var(--text-muted);
    font-size: 0.875rem;
  }
}

/* ===============================================
   ADVANCED KEYFRAMES & ANIMATIONS
   =============================================== */
@keyframes gradient-flow {
  0%,
  100% {
    background-position: 0% 50%;
  }
  50% {
    background-position: 100% 50%;
  }
}

@keyframes rotate-slow {
  from {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(360deg);
  }
}

@keyframes float {
  0%,
  100% {
    transform: translateY(0px);
  }
  50% {
    transform: translateY(-20px);
  }
}

@keyframes float-delayed {
  0%,
  100% {
    transform: translateY(0px);
  }
  50% {
    transform: translateY(-15px);
  }
}

@keyframes pulse-slow {
  0%,
  100% {
    opacity: 0.6;
    transform: scale(1);
  }
  50% {
    opacity: 1;
    transform: scale(1.05);
  }
}

@keyframes fade-in {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

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

@keyframes scale-in {
  from {
    opacity: 0;
    transform: scale(0.8);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

/* ===============================================
   ANIMATION UTILITY CLASSES
   =============================================== */
.animate-fade-in {
  animation: fade-in 0.8s var(--ease-smooth) forwards;
}

.animate-slide-up {
  animation: slide-up 0.8s var(--ease-smooth) forwards;
}

.animate-scale-in {
  animation: scale-in 0.8s var(--ease-smooth) forwards;
}

.animate-float {
  animation: float 6s ease-in-out infinite;
}

.animate-float-delayed {
  animation: float-delayed 8s ease-in-out infinite;
}

.animate-pulse-slow {
  animation: pulse-slow 4s ease-in-out infinite;
}

.animate-rotate-slow {
  animation: rotate-slow 20s linear infinite;
}

/* Animation Delays (renamed to avoid conflict with Tailwind transition delay) */
.anim-delay-100 { animation-delay: 0.1s; }
.anim-delay-200 { animation-delay: 0.2s; }
.anim-delay-300 { animation-delay: 0.3s; }
.anim-delay-400 { animation-delay: 0.4s; }
.anim-delay-500 { animation-delay: 0.5s; }
.anim-delay-600 { animation-delay: 0.6s; }
.anim-delay-700 { animation-delay: 0.7s; }
.anim-delay-800 { animation-delay: 0.8s; }
.anim-delay-900 { animation-delay: 0.9s; }
.skill-tag {
  display: inline-flex;
  align-items: center;
  padding: 0.75rem 1.5rem;
  background: linear-gradient(135deg, rgba(0, 212, 255, 0.08) 0%, rgba(124, 58, 237, 0.08) 100%);
  border: 1px solid transparent;
  background-image:
    linear-gradient(135deg, rgba(0, 212, 255, 0.08), rgba(124, 58, 237, 0.08)),
    linear-gradient(135deg, rgba(0, 212, 255, 0.4), rgba(124, 58, 237, 0.4));
  background-origin: border-box;
  background-clip: padding-box, border-box;
  color: var(--text-secondary);
  font-weight: 500;
  font-size: 0.875rem;
  border-radius: 9999px;
  transition: all 0.4s var(--ease-smooth);
  position: relative;
  overflow: hidden;
}

.skill-tag::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.1), transparent);
  transition: left 0.6s var(--ease-smooth);
}

.skill-tag:hover {
  transform: translateY(-3px) scale(1.05);
  box-shadow:
    0 10px 25px rgba(0, 212, 255, 0.25),
    inset 0 0 20px rgba(0, 212, 255, 0.1);
  color: var(--accent);
}

.skill-tag:hover::before {
  left: 100%;
}

/* === Timeline === */
.timeline-item {
  position: relative;
  width: 100%;
  display: flex;
  justify-content: flex-start;
  padding-left: calc(50% + 1.25rem); /* gutter from spine */
  margin-bottom: 4rem;
  margin-top: 2rem;
}

.timeline-item.timeline-item-right {
  justify-content: flex-end;
  padding-left: 0;
  padding-right: calc(50% + 1.25rem); /* gutter from spine */
}

.timeline-content {
  background: var(--glass-bg-heavy);
  backdrop-filter: blur(25px) saturate(180%);
  -webkit-backdrop-filter: blur(25px) saturate(180%);
  border: 1px solid var(--glass-border-medium);
  border-radius: 1.5rem;
  padding: 2.5rem;
  padding-top: 3rem;
  max-width: 460px;
  width: 100%;
  position: relative;
  transition: all 0.5s var(--ease-smooth);
  overflow: visible;
  margin-top: 0;
  z-index: 2; /* keep cards above the vertical line */
}

.timeline-content:hover {
  transform: translateY(-8px) scale(1.02);
  box-shadow: var(--shadow-elevated);
  border-color: var(--accent);
}

.timeline-year-badge {
  position: absolute;
  top: -0.75rem;
  left: 2rem;
  background: var(--gradient-primary);
  color: white;
  padding: 1.25rem 2rem;
  border-radius: 9999px;
  font-weight: 700;
  font-size: 0.875rem;
  box-shadow: 0 8px 20px rgba(0, 212, 255, 0.3);
  white-space: nowrap;
  min-width: fit-content;
  display: inline-block;
  z-index: 10;
  text-align: center;
  letter-spacing: 0.025em;
  line-height: 1.2;
}

.timeline-year-badge.gradient-secondary {
  background: var(--gradient-secondary);
  box-shadow: 0 8px 20px rgba(124, 58, 237, 0.3);
}

.timeline-year-badge.gradient-tertiary {
  background: var(--gradient-tertiary);
  box-shadow: 0 8px 20px rgba(6, 255, 165, 0.3);
}

.timeline-item::before {
  content: '';
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  width: 1.25rem;
  height: 1.25rem;
  background: var(--gradient-conic);
  border-radius: 50%;
  border: 4px solid var(--primary);
  box-shadow:
    0 0 0 4px rgba(0, 212, 255, 0.3),
    0 0 20px rgba(0, 212, 255, 0.5);
  z-index: 10;
}

/* Timeline Line */
.timeline-item:not(:last-child)::after {
  content: '';
  position: absolute;
  left: 50%;
  top: 1.25rem;
  transform: translateX(-50%);
  width: 2px;
  height: calc(100% + 2rem);
  background: linear-gradient(
    180deg,
    var(--accent) 0%,
    var(--accent-secondary) 50%,
    var(--accent-tertiary) 100%
  );
  z-index: 0; /* ensure the line stays behind cards */
}
/* Card sits flush to the gutter; no extra margins needed */
.timeline-item .timeline-content {
  margin-left: 0;
}

.timeline-item.timeline-item-right .timeline-content {
  margin-right: 0;
}

/* === RESEARCH CARDS SYSTEM === */
.research-card {
  background: var(--glass-bg-heavy);
  backdrop-filter: blur(25px) saturate(180%);
  -webkit-backdrop-filter: blur(25px) saturate(180%);
  border: 1px solid var(--glass-border-medium);
  border-radius: 2rem;
  padding: 3rem;
  transition: all 0.5s var(--ease-smooth);
  position: relative;
  overflow: hidden;
  height: 100%;
  display: flex;
  flex-direction: column;
}

.research-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--gradient-accent);
  transform: translateX(-100%);
  transition: transform 0.8s var(--ease-smooth);
}

.research-card::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  background: radial-gradient(circle, rgba(0, 212, 255, 0.1) 0%, transparent 70%);
  transform: translate(-50%, -50%);
  transition: all 0.6s var(--ease-smooth);
  border-radius: 50%;
}

.research-card:hover {
  transform: translateY(-12px) scale(1.02);
  box-shadow: var(--shadow-deep);
  border-color: var(--accent);
}

.research-card:hover::before {
  transform: translateX(0);
}

.research-card:hover::after {
  width: 200%;
  height: 200%;
}

.research-icon-gradient {
  width: 4rem;
  height: 4rem;
  background: var(--gradient-primary);
  border-radius: 1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.5rem;
  transition: all 0.4s var(--ease-smooth);
  box-shadow: 0 8px 25px rgba(0, 212, 255, 0.3);
}

.research-icon-gradient.gradient-secondary {
  background: var(--gradient-secondary);
  box-shadow: 0 8px 25px rgba(124, 58, 237, 0.3);
}

.research-icon-gradient.gradient-tertiary {
  background: var(--gradient-tertiary);
  box-shadow: 0 8px 25px rgba(6, 255, 165, 0.3);
}

.research-card:hover .research-icon-gradient {
  transform: scale(1.1) rotate(5deg);
  box-shadow: 0 12px 35px rgba(0, 212, 255, 0.4);
}

.research-feature {
  display: flex;
  align-items: center;
  padding: 0.75rem 0;
  color: var(--text-muted);
  font-size: 0.875rem;
  position: relative;
}

.research-feature::before {
  content: '→';
  margin-right: 0.75rem;
  color: var(--accent);
  font-weight: bold;
  transition: all 0.3s var(--ease-smooth);
}

.research-feature.gradient-secondary::before {
  color: var(--accent-secondary);
}

.research-feature.gradient-tertiary::before {
  color: var(--accent-tertiary);
}

.research-card:hover .research-feature::before {
  transform: translateX(4px);
}

/* === ACHIEVEMENT CARDS SYSTEM === */
.achievement-card {
  background: var(--glass-bg-heavy);
  backdrop-filter: blur(25px) saturate(180%);
  -webkit-backdrop-filter: blur(25px) saturate(180%);
  border: 1px solid var(--glass-border-medium);
  border-radius: 2rem;
  padding: 2.5rem;
  text-align: center;
  transition: all 0.5s var(--ease-smooth);
  position: relative;
  overflow: hidden;
}

.achievement-card::before {
  content: '';
  position: absolute;
  top: -2px;
  left: -2px;
  right: -2px;
  bottom: -2px;
  background: linear-gradient(
    135deg,
    rgba(255, 215, 0, 0.4) 0%,
    rgba(255, 193, 7, 0.3) 50%,
    rgba(255, 165, 0, 0.4) 100%
  );
  border-radius: inherit;
  opacity: 0.3;
  z-index: -1;
  transition: opacity 0.5s var(--ease-smooth);
}

.achievement-card:hover {
  transform: translateY(-12px) scale(1.05);
  box-shadow:
    0 35px 70px -15px rgba(0, 0, 0, 0.3),
    0 0 60px rgba(255, 215, 0, 0.15);
}

.achievement-card:hover::before {
  opacity: 0.3;
}

.achievement-rank-gradient {
  font-size: 3.5rem;
  font-weight: 900;
  background: var(--gradient-gold);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 1rem;
  /* Use heading utility/class to control font; avoid per-component font-family */
  line-height: 1;
}

.achievement-badge-gold {
  display: inline-block;
  padding: 0.375rem 1rem;
  background: linear-gradient(135deg, rgba(255, 215, 0, 0.15), rgba(255, 193, 7, 0.15));
  border: 1px solid rgba(255, 215, 0, 0.4);
  border-radius: 9999px;
  color: #ffd700;
  font-size: 0.875rem;
  font-weight: 500;
  transition: all 0.3s var(--ease-smooth);
}

.achievement-badge {
  display: inline-block;
  padding: 0.375rem 1rem;
  background: linear-gradient(135deg, rgba(0, 212, 255, 0.15), rgba(124, 58, 237, 0.15));
  border: 1px solid rgba(0, 212, 255, 0.4);
  border-radius: 9999px;
  color: var(--accent);
  font-size: 0.875rem;
  font-weight: 500;
  transition: all 0.3s var(--ease-smooth);
}

.achievement-badge-gold:hover,
.achievement-badge:hover {
  transform: translateY(-2px) scale(1.05);
}

.special-recognition-card {
  background: var(--glass-bg-heavy);
  backdrop-filter: blur(30px) saturate(200%);
  -webkit-backdrop-filter: blur(30px) saturate(200%);
  border: 1px solid var(--glass-border-heavy);
  border-radius: 2rem;
  padding: 3rem;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.special-recognition-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gradient-gold);
}

.subject-tag {
  display: inline-block;
  padding: 0.5rem 1.25rem;
  background: linear-gradient(135deg, rgba(255, 215, 0, 0.1), rgba(255, 193, 7, 0.1));
  border: 1px solid rgba(255, 215, 0, 0.3);
  border-radius: 9999px;
  color: #ffed4e;
  font-size: 0.875rem;
  font-weight: 500;
  margin: 0.25rem;
  transition: all 0.3s var(--ease-smooth);
}

.subject-tag:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(255, 215, 0, 0.3);
}

/* === IMPACT SECTION SYSTEM === */
.impact-card {
  background: var(--glass-bg-heavy);
  backdrop-filter: blur(25px) saturate(180%);
  -webkit-backdrop-filter: blur(25px) saturate(180%);
  border: 1px solid var(--glass-border-medium);
  border-radius: 2rem;
  padding: 3rem;
  transition: all 0.5s var(--ease-smooth);
  position: relative;
  overflow: hidden;
}

.impact-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--accent-tertiary), #10b981, #059669);
  transform: translateX(-100%);
  transition: transform 0.8s var(--ease-smooth);
}

.impact-card:hover {
  transform: translateY(-8px);
  box-shadow:
    0 30px 60px -15px rgba(0, 0, 0, 0.3),
    0 0 40px rgba(6, 255, 165, 0.15);
}

.impact-card:hover::before {
  transform: translateX(0);
}

.impact-card-secondary {
  background: var(--glass-bg-medium);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--glass-border-light);
  border-radius: 1.5rem;
  padding: 2rem;
  transition: all 0.4s var(--ease-smooth);
}

.impact-card-secondary:hover {
  background: var(--glass-bg-heavy);
  transform: translateY(-4px);
  box-shadow: 0 20px 40px rgba(6, 255, 165, 0.1);
}

.impact-icon {
  width: 3.5rem;
  height: 3.5rem;
  border-radius: 1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: all 0.3s var(--ease-smooth);
}

.stat-card-impact {
  background: linear-gradient(135deg, rgba(6, 255, 165, 0.05) 0%, rgba(16, 185, 129, 0.05) 100%);
  border: 1px solid rgba(6, 255, 165, 0.2);
  border-radius: 1rem;
  padding: 1.5rem;
  text-align: center;
  transition: all 0.3s var(--ease-smooth);
  position: relative;
  overflow: hidden;
}

.stat-card-impact::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(6, 255, 165, 0.1), transparent);
  transition: left 0.5s var(--ease-smooth);
}

.stat-card-impact:hover {
  transform: translateY(-4px) scale(1.02);
  border-color: var(--accent-tertiary);
  box-shadow: 0 12px 30px rgba(6, 255, 165, 0.2);
}

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

.stat-value-impact {
  font-size: 2.5rem;
  font-weight: 900;
  color: var(--accent-tertiary);
  line-height: 1;
  margin-bottom: 0.5rem;
}

.stat-label-impact {
  color: var(--text-secondary);
  font-weight: 600;
  font-size: 0.875rem;
}

.stat-icon-impact {
  position: absolute;
  top: 1rem;
  right: 1rem;
  color: var(--accent-tertiary);
  opacity: 0.3;
  transition: all 0.3s var(--ease-smooth);
}

.stat-card-impact:hover .stat-icon-impact {
  opacity: 0.7;
  transform: scale(1.1);
}

.impact-area-card {
  display: flex;
  gap: 1.5rem;
  padding: 1.5rem;
  background: var(--glass-bg-light);
  border: 1px solid var(--glass-border-light);
  border-radius: 1rem;
  transition: all 0.4s var(--ease-smooth);
  align-items: flex-start;
}

.impact-area-card:hover {
  background: var(--glass-bg-medium);
  transform: translateX(8px);
  border-color: var(--accent-tertiary);
}

.impact-area-icon {
  width: 3rem;
  height: 3rem;
  background: linear-gradient(135deg, var(--accent-tertiary), #10b981);
  border-radius: 0.75rem;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: all 0.3s var(--ease-smooth);
}

.impact-area-card:hover .impact-area-icon {
  transform: scale(1.1) rotate(3deg);
}

.impact-area-content {
  flex: 1;
}

.impact-area-arrow {
  color: var(--accent-tertiary);
  opacity: 0;
  transition: all 0.3s var(--ease-smooth);
  transform: translateX(-10px);
}

.impact-area-card:hover .impact-area-arrow {
  opacity: 1;
  transform: translateX(0);
}

.eco-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.25rem;
  background: linear-gradient(135deg, rgba(6, 255, 165, 0.1), rgba(16, 185, 129, 0.1));
  border: 1px solid rgba(6, 255, 165, 0.3);
  border-radius: 9999px;
  color: var(--accent-tertiary);
  font-size: 0.875rem;
  font-weight: 500;
  transition: all 0.3s var(--ease-smooth);
}

.eco-badge:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(6, 255, 165, 0.3);
}

.eco-icon {
  font-size: 1.125rem;
}

.philosophy-card {
  background: var(--glass-bg-heavy);
  backdrop-filter: blur(30px) saturate(200%);
  -webkit-backdrop-filter: blur(30px) saturate(200%);
  border: 1px solid var(--glass-border-heavy);
  border-radius: 1.5rem;
  padding: 2.5rem;
  position: relative;
  overflow: hidden;
}

.philosophy-gradient {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--accent-tertiary), #06b6d4, var(--accent-tertiary));
}

.philosophy-content {
  position: relative;
  z-index: 2;
}

.future-vision-card {
  background: var(--glass-bg-medium);
  border: 1px solid var(--glass-border-light);
  border-radius: 1rem;
  padding: 2rem;
  transition: all 0.3s var(--ease-smooth);
}

.future-vision-card:hover {
  background: var(--glass-bg-heavy);
  border-color: var(--accent-tertiary);
}

/* === CONTACT SECTION SYSTEM === */
.contact-card-ultimate {
  background: var(--glass-bg-heavy);
  backdrop-filter: blur(30px) saturate(200%);
  -webkit-backdrop-filter: blur(30px) saturate(200%);
  border-radius: 3rem;
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-deep);
}

.contact-method-card {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  padding: 2rem;
  background: var(--glass-bg-medium);
  border: 1px solid var(--glass-border-light);
  border-radius: 1.5rem;
  transition: all 0.4s var(--ease-smooth);
  text-decoration: none;
  position: relative;
  overflow: hidden;
}

.contact-method-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(0, 212, 255, 0.1), transparent);
  transition: left 0.5s var(--ease-smooth);
}

.contact-method-card:hover {
  background: var(--glass-bg-heavy);
  border-color: var(--accent);
  transform: translateY(-4px) scale(1.02);
  box-shadow: 0 15px 35px rgba(0, 212, 255, 0.2);
}

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

.contact-method-icon {
  width: 3.5rem;
  height: 3.5rem;
  background: var(--gradient-primary);
  border-radius: 1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: all 0.3s var(--ease-smooth);
}

.contact-method-icon.gradient-secondary {
  background: var(--gradient-secondary);
}

.contact-method-card:hover .contact-method-icon {
  transform: scale(1.1) rotate(5deg);
}

.contact-method-content {
  flex: 1;
  color: var(--text-primary);
}

.contact-method-arrow {
  color: var(--accent);
  opacity: 0;
  transition: all 0.3s var(--ease-smooth);
  transform: translateX(-10px);
}

.contact-method-card:hover .contact-method-arrow {
  opacity: 1;
  transform: translateX(0);
}

.opportunities-section {
  margin-top: 3rem;
}

.opportunities-grid {
  display: grid;
  gap: 1rem;
  margin-top: 2rem;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
}

.opportunity-card {
  display: flex;
  align-items: center;
  justify-content: center; /* Center content within cards */
  gap: 1rem;
  padding: 1rem 1.5rem;
  background: var(--glass-bg-light);
  border: 1px solid var(--glass-border-light);
  border-radius: 1rem;
  transition: all 0.3s var(--ease-smooth);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  text-align: center; /* Center text alignment */
  min-width: 200px; /* Minimum width for consistency */
  max-width: 300px; /* Maximum width to prevent cards from being too wide */
  flex: 1 1 200px; /* Flex grow, shrink, and basis for responsive behavior */
}

.opportunity-card:hover {
  background: var(--glass-bg-medium);
  border-color: var(--accent);
  transform: translateY(-2px);
  color: var(--accent);
}

.opportunity-icon {
  width: 2.5rem;
  height: 2.5rem;
  background: var(--gradient-primary);
  border-radius: 0.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: all 0.3s var(--ease-smooth);
}

.opportunity-icon.gradient-secondary {
  background: var(--gradient-secondary);
}

.opportunity-icon.gradient-tertiary {
  background: var(--gradient-tertiary);
}

.opportunity-card:hover .opportunity-icon {
  transform: scale(1.1);
}

/* Footer */
.footer-logo-container {
  position: relative;
  width: 3rem;
  height: 3rem;
}

.footer-logo-gradient {
  position: absolute;
  inset: 0;
  background: var(--gradient-accent);
  border-radius: 1rem;
  -webkit-filter: blur(8px);
  filter: blur(8px);
  opacity: 0.6;
  transition: all 0.3s var(--ease-smooth);
}

.footer-logo {
  position: relative;
  width: 100%;
  height: 100%;
  background: var(--gradient-accent);
  border-radius: 1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.3s var(--ease-smooth);
}

.footer-logo-container:hover .footer-logo-gradient {
  opacity: 1;
  transform: scale(1.1);
}

.footer-logo-container:hover .footer-logo {
  transform: scale(1.05) rotate(3deg);
}

.footer-social-link {
  width: 3rem;
  height: 3rem;
  background: var(--glass-bg-light);
  border: 1px solid var(--glass-border-light);
  border-radius: 0.75rem;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  transition: all 0.3s var(--ease-smooth);
  text-decoration: none;
}

.footer-social-link:hover {
  background: var(--glass-bg-heavy);
  border-color: var(--accent);
  color: var(--accent);
  transform: translateY(-2px);
}

.footer-link {
  color: var(--text-muted);
  text-decoration: none;
  transition: all 0.3s var(--ease-smooth);
  position: relative;
}

.footer-link::before {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--accent);
  transition: width 0.3s var(--ease-smooth);
}

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

.footer-link:hover::before {
  width: 100%;
}

/* === BACKGROUND PATTERNS === */
.bg-noise {
  background-image: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.03'%3E%3Ccircle cx='5' cy='5' r='1'/%3E%3Ccircle cx='25' cy='15' r='1'/%3E%3Ccircle cx='45' cy='25' r='1'/%3E%3Ccircle cx='15' cy='35' r='1'/%3E%3Ccircle cx='35' cy='45' r='1'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}

.bg-grid-pattern {
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.02) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.02) 1px, transparent 1px);
}

/* === RESPONSIVE DESIGN === */
@media (max-width: 768px) {
  .timeline-item,
  .timeline-item.timeline-item-right {
    padding-left: 2rem;
    padding-right: 0;
    justify-content: flex-start;
  }

  .timeline-item::before {
    left: 0;
    transform: translateX(0);
  }

  .timeline-content { max-width: none; }

  .timeline-year-badge {
    left: auto;
    right: 2rem;
    padding: 1rem 1.5rem;
    font-size: 0.8rem;
    line-height: 1.2;
  }

  .timeline-item:not(:last-child)::after {
    left: 0;
    transform: translateX(0);
  }

  .research-card,
  .achievement-card,
  .impact-card {
    padding: 2rem;
  }

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

  .contact-method-card {
    padding: 1.5rem;
  }
}

/* === ACCESSIBILITY ENHANCEMENTS === */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* Improve focus visibility on dark background */

@media (prefers-contrast: high) {
  :root {
    --glass-border-light: rgba(255, 255, 255, 0.3);
    --glass-border-medium: rgba(255, 255, 255, 0.5);
    --text-muted: #cbd5e1;
  }
}

/* Add this to the parent of skill tags */
.skill-tags-container {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  justify-content: center; /* Center align tags */
}

/* Animated gradient borders */
.gradient-border-animated {
  position: relative;
  background:
    linear-gradient(var(--primary), var(--primary)) padding-box,
    linear-gradient(
        45deg,
        var(--accent),
        var(--accent-secondary),
        var(--accent-tertiary),
        var(--accent)
      )
      border-box;
  border: 2px solid transparent;
  border-radius: 1rem;
}

#contact {
  scroll-margin-top: 4rem;
}

@media (max-width: 768px) {
  #contact {
    scroll-margin-top: 3rem;
  }
}