/* ===================================================================
   PORTFOLIO — Design System & Styles
   Author: Sahaj Kishorkumar Mistry
   =================================================================== */

/* ---------- Google Fonts ---------- */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&family=JetBrains+Mono:wght@400;500;600&display=swap');

/* ---------- CSS Custom Properties ---------- */
:root {
  /* Core palette — Navy + Coral */
  --clr-bg-primary: #0d1b2a;
  --clr-bg-secondary: #1b263b;
  --clr-bg-card: rgba(27, 38, 59, 0.65);
  --clr-bg-card-hover: rgba(40, 55, 80, 0.8);
  --clr-surface: rgba(224, 225, 221, 0.04);

  --clr-text-primary: #e0e1dd;
  --clr-text-secondary: #8d99ae;
  --clr-text-muted: #415a77;

  /* Accent gradients */
  --clr-accent-1: #ff5d5d;
  --clr-accent-2: #ff8a65;
  --clr-accent-3: #778da9;
  --gradient-accent: linear-gradient(135deg, var(--clr-accent-1), var(--clr-accent-2));
  --gradient-accent-2: linear-gradient(135deg, var(--clr-accent-2), var(--clr-accent-3));
  --gradient-hero: linear-gradient(160deg, #0d1b2a 0%, #1b263b 40%, #1f2e45 70%, #0d1b2a 100%);

  /* Glassmorphism */
  --glass-bg: rgba(224, 225, 221, 0.04);
  --glass-border: rgba(224, 225, 221, 0.08);
  --glass-blur: 20px;

  /* Typography */
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

  /* Spacing */
  --section-padding: 120px 0;
  --container-width: 1200px;
  --container-padding: 0 24px;

  /* Transitions */
  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-smooth: 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-spring: 0.6s cubic-bezier(0.34, 1.56, 0.64, 1);

  /* Shadows */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 8px 30px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 20px 60px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 40px rgba(255, 93, 93, 0.15);

  /* Border radius */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --radius-full: 9999px;

  /* Navbar */
  --navbar-height: 72px;
}

/* ---------- Light Theme Override ---------- */
[data-theme="light"] {
  --clr-bg-primary: #e0e1dd;
  --clr-bg-secondary: #d2d3cf;
  --clr-bg-card: rgba(255, 255, 255, 0.7);
  --clr-bg-card-hover: rgba(255, 255, 255, 0.9);
  --clr-surface: rgba(13, 27, 42, 0.04);

  --clr-text-primary: #0d1b2a;
  --clr-text-secondary: #415a77;
  --clr-text-muted: #778da9;

  --glass-bg: rgba(255, 255, 255, 0.55);
  --glass-border: rgba(13, 27, 42, 0.1);

  --gradient-hero: linear-gradient(160deg, #e0e1dd 0%, #d2d3cf 40%, #c8c9c5 70%, #e0e1dd 100%);

  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 8px 30px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 20px 60px rgba(0, 0, 0, 0.1);
  --shadow-glow: 0 0 40px rgba(255, 93, 93, 0.1);
}

/* ---------- Reset ---------- */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--navbar-height);
  font-size: 16px;
}

body {
  font-family: var(--font-body);
  background: var(--clr-bg-primary);
  color: var(--clr-text-primary);
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  color: var(--clr-accent-1);
  text-decoration: none;
  transition: color var(--transition-fast);
}
a:hover {
  color: var(--clr-accent-2);
}

img {
  max-width: 100%;
  display: block;
}

ul, ol {
  list-style: none;
}

/* ---------- Utility ---------- */
.container {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: var(--container-padding);
}

.gradient-text {
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.section-label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--clr-accent-1);
  margin-bottom: 16px;
}
.section-label::before {
  content: '';
  display: inline-block;
  width: 24px;
  height: 2px;
  background: var(--gradient-accent);
  border-radius: 2px;
}

.section-title {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 20px;
  letter-spacing: -0.02em;
}

.section-subtitle {
  font-size: 1.1rem;
  color: var(--clr-text-secondary);
  max-width: 600px;
  line-height: 1.7;
}

/* ---------- Scroll Animations ---------- */
.reveal {
  opacity: 0;
  will-change: transform, opacity;
  transition: opacity 1s cubic-bezier(0.16, 1, 0.3, 1),
              transform 1s cubic-bezier(0.16, 1, 0.3, 1);
  transform: translateY(30px); /* default */
}

/* Modifiers */
.reveal.slide-up { transform: translateY(60px); }
.reveal.slide-down { transform: translateY(-60px); }
.reveal.slide-left { transform: translateX(-60px); }
.reveal.slide-right { transform: translateX(60px); }
.reveal.scale-up { transform: scale(0.92); }

.reveal.visible {
  opacity: 1;
  transform: translate(0) scale(1);
}

.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.18s; }
.reveal-delay-3 { transition-delay: 0.26s; }
.reveal-delay-4 { transition-delay: 0.34s; }
.reveal-delay-5 { transition-delay: 0.42s; }

/* ---------- Interactive Glassmorphism Spotlight ---------- */
.timeline-card,
.research-card,
.skill-category,
.edu-card,
.achievement-card,
.stat-card {
  position: relative;
  overflow: hidden;
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  transition: transform var(--transition-smooth),
              box-shadow var(--transition-smooth),
              border-color var(--transition-smooth),
              background-color var(--transition-smooth);
}

.timeline-card::after,
.research-card::after,
.skill-category::after,
.edu-card::after,
.achievement-card::after,
.stat-card::after {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(
    350px circle at var(--mouse-x, 0px) var(--mouse-y, 0px),
    rgba(255, 93, 93, 0.09),
    transparent 80%
  );
  z-index: 1;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.4s ease;
}

.timeline-card:hover::after,
.research-card:hover::after,
.skill-category:hover::after,
.edu-card:hover::after,
.achievement-card:hover::after,
.stat-card:hover::after {
  opacity: 1;
}

.timeline-card > *,
.research-card > *,
.skill-category > *,
.edu-card > *,
.achievement-card > *,
.stat-card > * {
  position: relative;
  z-index: 2;
}

/* ===================================================================
   NAVBAR
   =================================================================== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--navbar-height);
  z-index: 1000;
  transition: background var(--transition-smooth),
              box-shadow var(--transition-smooth),
              backdrop-filter var(--transition-smooth);
}
.navbar.scrolled {
  background: rgba(13, 27, 42, 0.88);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: 0 1px 0 var(--glass-border);
}
[data-theme="light"] .navbar.scrolled {
  background: rgba(224, 225, 221, 0.88);
}

.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.nav-logo {
  font-size: 1.3rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--clr-text-primary);
  transition: color var(--transition-fast);
}
.nav-logo span {
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-link {
  position: relative;
  padding: 8px 16px;
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--clr-text-secondary);
  border-radius: var(--radius-full);
  transition: color var(--transition-fast), background var(--transition-fast);
}
.nav-link:hover,
.nav-link.active {
  color: var(--clr-text-primary);
  background: var(--clr-surface);
}
.nav-link.active {
  color: var(--clr-accent-1);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.theme-toggle {
  width: 40px;
  height: 40px;
  border: none;
  background: var(--glass-bg);
  border-radius: var(--radius-full);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--clr-text-secondary);
  font-size: 1.1rem;
  transition: background var(--transition-fast), color var(--transition-fast), transform var(--transition-fast);
  border: 1px solid var(--glass-border);
}
.theme-toggle:hover {
  background: var(--clr-surface);
  color: var(--clr-accent-1);
  transform: rotate(15deg);
}

/* Hamburger */
.mobile-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  z-index: 1001;
}
.mobile-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--clr-text-primary);
  border-radius: 2px;
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}
.mobile-toggle.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}
.mobile-toggle.active span:nth-child(2) {
  opacity: 0;
}
.mobile-toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* ===================================================================
   HERO
   =================================================================== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  background: var(--gradient-hero);
  overflow: hidden;
}

#hero-canvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  opacity: 0.5;
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 800px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-full);
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--clr-accent-1);
  margin-bottom: 28px;
  backdrop-filter: blur(10px);
}
.hero-badge .dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: #ff5d5d;
  animation: pulse-dot 2s ease-in-out infinite;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(1.4); }
}

.hero-name {
  font-size: clamp(2.8rem, 6vw, 4.5rem);
  font-weight: 900;
  line-height: 1.08;
  letter-spacing: -0.03em;
  margin-bottom: 16px;
}

.hero-title {
  font-size: clamp(1.1rem, 2vw, 1.4rem);
  color: var(--clr-text-secondary);
  font-weight: 400;
  margin-bottom: 32px;
  line-height: 1.6;
}
.hero-title strong {
  color: var(--clr-text-primary);
  font-weight: 600;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 48px;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 28px;
  font-family: var(--font-body);
  font-size: 0.92rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  border: none;
  cursor: pointer;
  transition: all var(--transition-smooth);
  text-decoration: none;
}

.btn-primary {
  background: var(--gradient-accent);
  color: #fff;
  box-shadow: 0 4px 20px rgba(255, 93, 93, 0.3);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(255, 93, 93, 0.45);
  color: #fff;
}

.btn-outline {
  background: transparent;
  color: var(--clr-text-primary);
  border: 1px solid var(--glass-border);
  backdrop-filter: blur(10px);
}
.btn-outline:hover {
  background: var(--glass-bg);
  border-color: var(--clr-accent-1);
  color: var(--clr-accent-1);
  transform: translateY(-2px);
}

.hero-socials {
  display: flex;
  gap: 12px;
}

.social-link {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-full);
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  color: var(--clr-text-secondary);
  font-size: 1.15rem;
  transition: all var(--transition-fast);
}
.social-link:hover {
  background: var(--gradient-accent);
  border-color: transparent;
  color: #fff;
  transform: translateY(-3px);
  box-shadow: var(--shadow-glow);
}

/* Hero glow orbs */
.hero-glow {
  position: absolute;
  border-radius: 50%;
  filter: blur(120px);
  pointer-events: none;
  z-index: 0;
}
.hero-glow-1 {
  width: 600px;
  height: 600px;
  background: rgba(255, 93, 93, 0.08);
  top: -100px;
  right: -200px;
}
.hero-glow-2 {
  width: 500px;
  height: 500px;
  background: rgba(255, 138, 101, 0.06);
  bottom: -150px;
  left: -100px;
}

/* ===================================================================
   ABOUT
   =================================================================== */
.about {
  padding: var(--section-padding);
  background: var(--clr-bg-secondary);
  position: relative;
}

.about-grid {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 60px;
  align-items: start;
  margin-top: 48px;
}

.about-photo-wrapper {
  position: relative;
}

.about-photo {
  width: 280px;
  height: 320px;
  border-radius: var(--radius-lg);
  object-fit: cover;
  object-position: center top;
  border: 2px solid var(--glass-border);
  box-shadow: var(--shadow-lg);
}

.about-photo-wrapper::after {
  content: '';
  position: absolute;
  inset: -4px;
  border-radius: calc(var(--radius-lg) + 4px);
  background: var(--gradient-accent);
  z-index: -1;
  opacity: 0.3;
  filter: blur(12px);
}

.about-text p {
  font-size: 1.05rem;
  color: var(--clr-text-secondary);
  margin-bottom: 20px;
  line-height: 1.8;
}
.about-text p strong {
  color: var(--clr-text-primary);
  font-weight: 600;
}

.about-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-top: 36px;
}

.stat-card {
  padding: 24px;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  text-align: center;
  transition: all var(--transition-smooth);
}
.stat-card:hover {
  background: var(--clr-bg-card-hover);
  transform: translateY(-4px);
  box-shadow: var(--shadow-glow);
}

.stat-number {
  font-size: 2.2rem;
  font-weight: 800;
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.2;
}

.stat-label {
  font-size: 0.82rem;
  color: var(--clr-text-muted);
  margin-top: 4px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 1px;
}

/* ===================================================================
   EXPERIENCE
   =================================================================== */
.experience {
  padding: var(--section-padding);
  position: relative;
}

.timeline {
  position: relative;
  margin-top: 52px;
  padding-left: 40px;
}
.timeline::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom, var(--clr-accent-1), var(--clr-accent-2), transparent);
  border-radius: 2px;
}

.timeline-item {
  position: relative;
  margin-bottom: 48px;
}
.timeline-item:last-child {
  margin-bottom: 0;
}

.timeline-dot {
  position: absolute;
  left: -47px;
  top: 6px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--clr-bg-primary);
  border: 3px solid var(--clr-accent-1);
  z-index: 2;
  transition: all var(--transition-fast);
}
.timeline-item:hover .timeline-dot {
  background: var(--clr-accent-1);
  box-shadow: 0 0 16px rgba(255, 93, 93, 0.5);
}

.timeline-card {
  padding: 32px;
  background: var(--clr-bg-card);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(var(--glass-blur));
  transition: all var(--transition-smooth);
}
.timeline-card:hover {
  background: var(--clr-bg-card-hover);
  border-color: rgba(255, 93, 93, 0.2);
  transform: translateX(8px);
  box-shadow: var(--shadow-glow);
}

.timeline-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 8px;
}

.timeline-company {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--clr-text-primary);
}

.timeline-date {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--clr-accent-1);
  padding: 4px 12px;
  background: rgba(255, 93, 93, 0.1);
  border-radius: var(--radius-full);
  white-space: nowrap;
}

.timeline-role {
  font-size: 1rem;
  color: var(--clr-text-secondary);
  font-weight: 500;
  margin-bottom: 16px;
}

.timeline-details {
  list-style: none;
}
.timeline-details li {
  position: relative;
  padding-left: 20px;
  margin-bottom: 10px;
  font-size: 0.92rem;
  color: var(--clr-text-secondary);
  line-height: 1.7;
}
.timeline-details li::before {
  content: '▹';
  position: absolute;
  left: 0;
  color: var(--clr-accent-1);
  font-size: 0.9rem;
}

.timeline-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 16px;
}

.tag {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  padding: 4px 10px;
  background: rgba(255, 93, 93, 0.08);
  color: var(--clr-accent-1);
  border-radius: var(--radius-full);
  border: 1px solid rgba(255, 93, 93, 0.15);
  font-weight: 500;
  letter-spacing: 0.5px;
}
.tag-purple {
  background: rgba(255, 138, 101, 0.08);
  color: var(--clr-accent-2);
  border-color: rgba(255, 138, 101, 0.15);
}
.tag-cyan {
  background: rgba(119, 141, 169, 0.12);
  color: var(--clr-accent-3);
  border-color: rgba(119, 141, 169, 0.2);
}

/* ===================================================================
   RESEARCH & PROJECTS
   =================================================================== */
.research {
  padding: var(--section-padding);
  background: var(--clr-bg-secondary);
}

.research-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(360px, 1fr));
  gap: 24px;
  margin-top: 48px;
}

.research-card {
  position: relative;
  padding: 32px;
  background: var(--clr-bg-card);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(var(--glass-blur));
  transition: all var(--transition-smooth);
  overflow: hidden;
}
.research-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gradient-accent);
  opacity: 0;
  transition: opacity var(--transition-smooth);
}
.research-card:hover {
  transform: translateY(-6px);
  border-color: rgba(255, 93, 93, 0.2);
  box-shadow: var(--shadow-glow);
}
.research-card:hover::before {
  opacity: 1;
}

.research-card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 12px;
  margin-bottom: 12px;
}

.research-icon {
  font-size: 1.8rem;
  flex-shrink: 0;
}

.research-institution {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--clr-accent-1);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 8px;
}

.research-title {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--clr-text-primary);
  margin-bottom: 12px;
  line-height: 1.4;
}

.research-desc {
  font-size: 0.9rem;
  color: var(--clr-text-secondary);
  line-height: 1.7;
  margin-bottom: 16px;
}

.research-metrics {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 16px;
}

.metric {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--clr-text-primary);
}
.metric-icon {
  font-size: 1rem;
}

.research-card-footer {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

/* ===================================================================
   PUBLICATIONS
   =================================================================== */
.publications {
  padding: var(--section-padding);
}

.pub-list {
  margin-top: 48px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.pub-item {
  display: flex;
  gap: 20px;
  padding: 24px 28px;
  background: var(--clr-bg-card);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  backdrop-filter: blur(var(--glass-blur));
  transition: all var(--transition-smooth);
  align-items: flex-start;
}
.pub-item:hover {
  background: var(--clr-bg-card-hover);
  border-color: rgba(255, 93, 93, 0.2);
  transform: translateX(6px);
}

.pub-number {
  font-family: var(--font-mono);
  font-size: 1.3rem;
  font-weight: 700;
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  flex-shrink: 0;
  line-height: 1.5;
}

.pub-content {
  flex: 1;
}

.pub-title {
  font-size: 0.95rem;
  color: var(--clr-text-primary);
  font-weight: 500;
  line-height: 1.6;
  margin-bottom: 10px;
}
.pub-title strong {
  font-weight: 700;
}

.pub-venue {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  padding: 4px 12px;
  border-radius: var(--radius-full);
  text-transform: uppercase;
  letter-spacing: 1px;
}
.venue-cvpr {
  background: rgba(255, 93, 93, 0.12);
  color: var(--clr-accent-1);
  border: 1px solid rgba(255, 93, 93, 0.2);
}
.venue-miccai {
  background: rgba(255, 138, 101, 0.12);
  color: var(--clr-accent-2);
  border: 1px solid rgba(255, 138, 101, 0.2);
}
.venue-iclr {
  background: rgba(99, 179, 237, 0.12);
  color: #63b3ed;
  border: 1px solid rgba(99, 179, 237, 0.25);
}

.venue-icassp {
  background: rgba(119, 141, 169, 0.12);
  color: var(--clr-accent-3);
  border: 1px solid rgba(119, 141, 169, 0.2);
}

/* ===================================================================
   SKILLS
   =================================================================== */
.skills {
  padding: var(--section-padding);
  background: var(--clr-bg-secondary);
}

.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 24px;
  margin-top: 48px;
}

.skill-category {
  padding: 28px;
  background: var(--clr-bg-card);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(var(--glass-blur));
  transition: all var(--transition-smooth);
}
.skill-category:hover {
  border-color: rgba(255, 93, 93, 0.2);
  box-shadow: var(--shadow-glow);
}

.skill-category-icon {
  font-size: 1.6rem;
  margin-bottom: 12px;
}

.skill-category-name {
  font-size: 1rem;
  font-weight: 700;
  color: var(--clr-text-primary);
  margin-bottom: 16px;
}

.skill-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.skill-chip {
  font-size: 0.8rem;
  font-weight: 500;
  padding: 6px 14px;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-full);
  color: var(--clr-text-secondary);
  transition: all var(--transition-fast);
  cursor: default;
}
.skill-chip:hover {
  background: rgba(255, 93, 93, 0.1);
  color: var(--clr-accent-1);
  border-color: rgba(255, 93, 93, 0.3);
  transform: translateY(-2px);
}

/* ===================================================================
   EDUCATION
   =================================================================== */
.education {
  padding: var(--section-padding);
}

.education-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
  gap: 24px;
  margin-top: 48px;
}

.edu-card {
  padding: 32px;
  background: var(--clr-bg-card);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(var(--glass-blur));
  transition: all var(--transition-smooth);
  position: relative;
  overflow: hidden;
}
.edu-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gradient-accent);
}
.edu-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-glow);
  border-color: rgba(255, 93, 93, 0.2);
}

.edu-degree {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--clr-text-primary);
  margin-bottom: 4px;
}

.edu-institution {
  font-size: 1rem;
  color: var(--clr-accent-1);
  font-weight: 600;
  margin-bottom: 4px;
}

.edu-period {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--clr-text-muted);
  margin-bottom: 16px;
}

.edu-details {
  font-size: 0.9rem;
  color: var(--clr-text-secondary);
  line-height: 1.7;
}
.edu-details strong {
  color: var(--clr-text-primary);
  font-weight: 600;
}

/* ===================================================================
   ACHIEVEMENTS
   =================================================================== */
.achievements {
  padding: var(--section-padding);
  background: var(--clr-bg-secondary);
}

.achievements-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 20px;
  margin-top: 48px;
}

.achievement-card {
  padding: 24px;
  background: var(--clr-bg-card);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  backdrop-filter: blur(var(--glass-blur));
  transition: all var(--transition-smooth);
  display: flex;
  gap: 16px;
  align-items: flex-start;
}
.achievement-card:hover {
  background: var(--clr-bg-card-hover);
  transform: translateY(-4px);
  box-shadow: var(--shadow-glow);
}

.achievement-icon {
  font-size: 1.6rem;
  flex-shrink: 0;
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
}

.achievement-content h4 {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--clr-text-primary);
  margin-bottom: 6px;
}
.achievement-content p {
  font-size: 0.85rem;
  color: var(--clr-text-secondary);
  line-height: 1.6;
}

/* ===================================================================
   CONTACT / FOOTER
   =================================================================== */
.contact {
  padding: var(--section-padding);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.contact-glow {
  position: absolute;
  width: 500px;
  height: 500px;
  border-radius: 50%;
  background: rgba(255, 93, 93, 0.05);
  filter: blur(100px);
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  pointer-events: none;
}

.contact .section-subtitle {
  margin: 0 auto 40px auto;
}

.contact-actions {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 48px;
}

.footer {
  padding: 32px 0;
  border-top: 1px solid var(--glass-border);
  text-align: center;
}

.footer-socials {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin-bottom: 20px;
}

.footer-text {
  font-size: 0.82rem;
  color: var(--clr-text-muted);
}

/* ===================================================================
   MOBILE RESPONSIVE
   =================================================================== */
@media (max-width: 900px) {
  :root {
    --section-padding: 80px 0;
  }

  .nav-links {
    position: fixed;
    top: 0;
    right: -100%;
    width: 300px;
    height: 100vh;
    background: var(--clr-bg-primary);
    flex-direction: column;
    justify-content: center;
    gap: 4px;
    padding: 40px;
    transition: right var(--transition-smooth);
    box-shadow: -10px 0 40px rgba(0, 0, 0, 0.5);
    border-left: 1px solid var(--glass-border);
  }
  .nav-links.open {
    right: 0;
  }

  .mobile-toggle {
    display: flex;
  }

  .about-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  .about-photo {
    width: 200px;
    height: 240px;
    margin: 0 auto;
  }

  .about-stats {
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
  }

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

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

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

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

@media (max-width: 600px) {
  :root {
    --section-padding: 64px 0;
    --navbar-height: 64px;
  }

  .hero-name {
    font-size: 2.2rem;
  }

  .hero-actions {
    flex-direction: column;
  }
  .btn {
    justify-content: center;
  }

  .about-stats {
    grid-template-columns: 1fr;
  }

  .stat-card {
    padding: 16px;
  }

  .timeline {
    padding-left: 28px;
  }
  .timeline-dot {
    left: -35px;
    width: 12px;
    height: 12px;
  }
  .timeline-card {
    padding: 20px;
  }

  .pub-item {
    flex-direction: column;
    gap: 8px;
    padding: 20px;
  }

  .contact-actions {
    flex-direction: column;
    align-items: center;
  }
}

/* ===================================================================
   SCROLLBAR
   =================================================================== */
::-webkit-scrollbar {
  width: 8px;
}
::-webkit-scrollbar-track {
  background: var(--clr-bg-primary);
}
::-webkit-scrollbar-thumb {
  background: rgba(255, 93, 93, 0.3);
  border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
  background: rgba(255, 93, 93, 0.5);
}

/* ===================================================================
   SELECTION
   =================================================================== */
::selection {
  background: rgba(255, 93, 93, 0.25);
  color: var(--clr-text-primary);
}

/* ===================================================================
   MOBILE OVERLAY
   =================================================================== */
.nav-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  z-index: 998;
  opacity: 0;
  transition: opacity var(--transition-smooth);
}
.nav-overlay.active {
  display: block;
  opacity: 1;
}