/* ============================================================
   RAJIB BISWAS PORTFOLIO — Dark Academic Luxury Design System
   ============================================================ */

/* ---------- CSS Custom Properties ---------- */
:root {
  /* Colors */
  --bg-primary:       #0A0E1A;
  --bg-surface:       #111827;
  --bg-elevated:      #1A2235;
  --accent-gold:      #D4A94A;
  --accent-gold-dim:  #A07830;
  --accent-glow:      rgba(212, 169, 74, 0.15);
  --text-primary:     #F1F0ED;
  --text-secondary:   #8B9CB6;
  --text-tertiary:    #4A5568;
  --border-gold:      rgba(212, 169, 74, 0.20);
  --border-subtle:    rgba(255, 255, 255, 0.06);
  --gradient-hero:    linear-gradient(135deg, #0A0E1A 0%, #0D1526 50%, #0A0E1A 100%);
  --shadow-gold:      0 0 30px rgba(212, 169, 74, 0.15);
  --shadow-card:      0 4px 24px rgba(0, 0, 0, 0.4);
  --radius-card:      16px;
  --radius-sm:        8px;
  --transition-base:  0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow:  0.6s cubic-bezier(0.4, 0, 0.2, 1);

  /* Typography */
  --ff-display:  'Playfair Display', Georgia, serif;
  --ff-body:     'DM Sans', sans-serif;
  --ff-mono:     'JetBrains Mono', monospace;

  /* Font Scale (fluid) */
  --fs-hero:  clamp(2.8rem, 6vw, 5rem);
  --fs-h1:    clamp(2rem, 4vw, 3rem);
  --fs-h2:    clamp(1.5rem, 3vw, 2.2rem);
  --fs-h3:    clamp(1.1rem, 2vw, 1.4rem);
  --fs-body:  clamp(0.95rem, 1.5vw, 1.05rem);
  --fs-sm:    0.875rem;
  --fs-xs:    0.75rem;

  /* Spacing */
  --section-py: clamp(4rem, 8vw, 7rem);
  --container-px: clamp(1rem, 4vw, 2rem);
  --container-max: 1200px;
}


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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

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

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

a {
  color: var(--accent-gold);
  text-decoration: none;
  transition: color var(--transition-base);
}

a:hover {
  color: var(--text-primary);
}

a:focus-visible {
  outline: 2px solid var(--accent-gold);
  outline-offset: 3px;
  border-radius: 2px;
}

button:focus-visible {
  outline: 2px solid var(--accent-gold);
  outline-offset: 3px;
  border-radius: 2px;
}

ul {
  list-style: none;
}

h1, h2, h3, h4 {
  font-family: var(--ff-display);
  font-weight: 600;
  line-height: 1.2;
  color: var(--text-primary);
}


/* ---------- Custom Scrollbar ---------- */
::-webkit-scrollbar {
  width: 6px;
}

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

::-webkit-scrollbar-thumb {
  background: var(--accent-gold);
  border-radius: 3px;
}

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


/* ---------- Selection ---------- */
::selection {
  background: rgba(212, 169, 74, 0.3);
  color: var(--text-primary);
}


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


/* ---------- Section Common ---------- */
.section {
  padding: var(--section-py) 0;
  position: relative;
}

.section-header {
  text-align: center;
  margin-bottom: 3.5rem;
}

.section-tag {
  display: inline-block;
  font-family: var(--ff-mono);
  font-size: var(--fs-xs);
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--accent-gold);
  background: rgba(212, 169, 74, 0.08);
  border: 1px solid var(--border-gold);
  border-radius: 20px;
  padding: 0.35rem 1rem;
  margin-bottom: 1rem;
}

.section-tag i {
  margin-right: 0.4rem;
}

.section-title {
  font-size: var(--fs-h1);
  font-weight: 700;
  margin-bottom: 0.8rem;
}

.title-underline {
  width: 60px;
  height: 3px;
  background: linear-gradient(90deg, var(--accent-gold), var(--accent-gold-dim));
  margin: 0 auto;
  border-radius: 2px;
}


/* ---------- Section Divider ---------- */
.section-divider {
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--accent-gold), transparent);
  margin: 0 auto;
  max-width: 600px;
}


/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.8rem 1.8rem;
  font-family: var(--ff-body);
  font-size: var(--fs-sm);
  font-weight: 500;
  border-radius: var(--radius-sm);
  border: none;
  cursor: pointer;
  transition: all var(--transition-base);
  text-decoration: none;
  letter-spacing: 0.02em;
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent-gold), #E8C06A);
  color: var(--bg-primary);
  box-shadow: 0 4px 20px rgba(212, 169, 74, 0.3);
}

.btn-primary:hover {
  box-shadow: 0 6px 30px rgba(212, 169, 74, 0.45);
  color: var(--bg-primary);
  transform: translateY(-2px);
}

.btn-outline {
  background: transparent;
  color: var(--accent-gold);
  border: 1px solid var(--accent-gold);
}

.btn-outline:hover {
  background: rgba(212, 169, 74, 0.1);
  color: var(--accent-gold);
  transform: translateY(-2px);
}

.magnetic-btn {
  transition: transform 0.2s cubic-bezier(0.4, 0, 0.2, 1),
              box-shadow var(--transition-base),
              background var(--transition-base);
}


/* ============================================================
   PAGE LOADER
   ============================================================ */
.page-loader {
  position: fixed;
  inset: 0;
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-primary);
  transition: opacity 0.5s ease, visibility 0.5s ease;
}

.page-loader.loaded {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

.loader-monogram {
  font-family: var(--ff-display);
  font-size: 3rem;
  font-weight: 700;
  color: var(--accent-gold);
  animation: loaderPulse 1.2s ease-in-out infinite;
}

@keyframes loaderPulse {
  0%, 100% { opacity: 0.4; transform: scale(0.95); }
  50%      { opacity: 1;   transform: scale(1.05); }
}


/* ============================================================
   MESSAGES / ALERTS
   ============================================================ */
.messages-container {
  position: fixed;
  top: 80px;
  right: 20px;
  z-index: 2000;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  max-width: 400px;
}

.alert {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem 1.2rem;
  border-radius: var(--radius-sm);
  background: var(--bg-elevated);
  border: 1px solid var(--border-gold);
  color: var(--text-primary);
  font-size: var(--fs-sm);
  box-shadow: var(--shadow-card);
  animation: slideInRight 0.4s ease-out;
}

.alert-success {
  border-left: 3px solid #4ade80;
}

.alert-danger {
  border-left: 3px solid #f87171;
}

.alert-close {
  background: none;
  border: none;
  color: var(--text-tertiary);
  cursor: pointer;
  padding: 0.25rem;
  font-size: 0.9rem;
  transition: color var(--transition-base);
}

.alert-close:hover {
  color: var(--text-primary);
}

@keyframes slideInRight {
  from { transform: translateX(100px); opacity: 0; }
  to   { transform: translateX(0);     opacity: 1; }
}


/* ============================================================
   NAVBAR
   ============================================================ */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 1rem 0;
  transition: background var(--transition-base),
              backdrop-filter var(--transition-base),
              border-bottom var(--transition-base),
              box-shadow var(--transition-base),
              padding var(--transition-base);
}

.navbar.scrolled {
  background: rgba(10, 14, 26, 0.95);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-gold);
  box-shadow: var(--shadow-gold);
  padding: 0.6rem 0;
}

.navbar-container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-px);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.navbar-brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: var(--text-primary);
}

.navbar-brand:hover {
  color: var(--text-primary);
}

.monogram {
  font-family: var(--ff-display);
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--accent-gold);
  border: 2px solid var(--accent-gold);
  padding: 0.15rem 0.5rem;
  border-radius: 4px;
  line-height: 1.3;
}

.brand-name {
  font-family: var(--ff-display);
  font-style: italic;
  font-size: 1.1rem;
  font-weight: 400;
  color: var(--text-primary);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 0.2rem;
}

.nav-link {
  font-family: var(--ff-body);
  font-size: var(--fs-sm);
  font-weight: 500;
  letter-spacing: 0.05em;
  color: var(--text-secondary);
  padding: 0.5rem 0.8rem;
  position: relative;
  text-decoration: none;
  transition: color var(--transition-base);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 0;
  height: 2px;
  background: var(--accent-gold);
  transition: width var(--transition-base);
  border-radius: 1px;
}

.nav-link:hover,
.nav-link.active {
  color: var(--accent-gold);
}

.nav-link:hover::after,
.nav-link.active::after {
  width: 60%;
}

.nav-scholar-btn {
  font-family: var(--ff-body);
  font-size: var(--fs-xs);
  font-weight: 500;
  color: var(--accent-gold);
  border: 1px solid var(--accent-gold);
  padding: 0.35rem 0.8rem;
  border-radius: 20px;
  text-decoration: none;
  margin-left: 0.5rem;
  transition: all var(--transition-base);
}

.nav-scholar-btn:hover {
  background: rgba(212, 169, 74, 0.1);
  color: var(--accent-gold);
}

/* Hamburger */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
  z-index: 1002;
}

.hamburger-line {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  transition: all var(--transition-base);
  border-radius: 1px;
}

.hamburger.active .hamburger-line:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

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

.hamburger.active .hamburger-line:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* Mobile Menu */
.mobile-menu {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 1001;
  background: rgba(10, 14, 26, 0.98);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-base), visibility var(--transition-base);
}

.mobile-menu.active {
  opacity: 1;
  visibility: visible;
}

.mobile-nav-links {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.5rem;
}

.mobile-nav-link {
  font-family: var(--ff-display);
  font-size: 1.5rem;
  color: var(--text-primary);
  text-decoration: none;
  transition: color var(--transition-base), transform var(--transition-base);
  opacity: 0;
  transform: translateY(20px);
}

.mobile-menu.active .mobile-nav-link {
  opacity: 1;
  transform: translateY(0);
}

/* Stagger mobile nav links */
.mobile-menu.active .mobile-nav-links li:nth-child(1) .mobile-nav-link { transition-delay: 0.05s; }
.mobile-menu.active .mobile-nav-links li:nth-child(2) .mobile-nav-link { transition-delay: 0.10s; }
.mobile-menu.active .mobile-nav-links li:nth-child(3) .mobile-nav-link { transition-delay: 0.15s; }
.mobile-menu.active .mobile-nav-links li:nth-child(4) .mobile-nav-link { transition-delay: 0.20s; }
.mobile-menu.active .mobile-nav-links li:nth-child(5) .mobile-nav-link { transition-delay: 0.25s; }
.mobile-menu.active .mobile-nav-links li:nth-child(6) .mobile-nav-link { transition-delay: 0.30s; }
.mobile-menu.active .mobile-nav-links li:nth-child(7) .mobile-nav-link { transition-delay: 0.35s; }
.mobile-menu.active .mobile-nav-links li:nth-child(8) .mobile-nav-link,
.mobile-menu.active .mobile-nav-links li:nth-child(8) .mobile-scholar-btn { transition-delay: 0.40s; }

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

.mobile-scholar-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--ff-body);
  font-size: 1rem;
  color: var(--accent-gold);
  border: 1px solid var(--accent-gold);
  padding: 0.5rem 1.2rem;
  border-radius: 20px;
  text-decoration: none;
  transition: background var(--transition-base), transform var(--transition-base);
  opacity: 0;
  transform: translateY(20px);
}

.mobile-menu.active .mobile-scholar-btn {
  opacity: 1;
  transform: translateY(0);
}

.mobile-scholar-btn:hover {
  background: rgba(212, 169, 74, 0.1);
  color: var(--accent-gold);
}


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

/* Grain overlay */
.hero-grain {
  position: absolute;
  inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.65' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)' opacity='0.4'/%3E%3C/svg%3E");
  opacity: 0.03;
  pointer-events: none;
  z-index: 1;
}

.particles-canvas {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  padding: 2rem var(--container-px);
  max-width: 800px;
}

/* Profile Photo */
.hero-photo-wrapper {
  margin-bottom: 2rem;
}

.hero-photo {
  width: 180px;
  height: 180px;
  margin: 0 auto;
  border-radius: 50%;
  padding: 4px;
  background: linear-gradient(135deg, var(--accent-gold), var(--accent-gold-dim));
  box-shadow: 0 0 0 3px var(--accent-gold),
              0 0 60px rgba(212, 169, 74, 0.3);
}

.hero-photo img {
  width: 100%;
  height: 100%;
  border-radius: 50%;
  object-fit: cover;
  background: var(--bg-surface);
}

/* Hero Text */
.hero-name {
  font-family: var(--ff-display);
  font-size: var(--fs-hero);
  font-weight: 700;
  line-height: 1.1;
  margin-bottom: 0.8rem;
  background: linear-gradient(135deg, var(--text-primary), var(--accent-gold));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-family: var(--ff-mono);
  font-size: clamp(1rem, 2vw, 1.3rem);
  color: var(--accent-gold);
  min-height: 2rem;
  margin-bottom: 1rem;
}

.hero-description {
  font-size: var(--fs-body);
  color: var(--text-secondary);
  margin-bottom: 2rem;
  line-height: 1.8;
}

.hero-university {
  color: var(--accent-gold-dim);
  font-weight: 500;
}

/* CTAs */
.hero-cta {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 3rem;
}

/* Scroll Arrow */
.scroll-arrow {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  color: var(--accent-gold);
  font-size: 1rem;
  animation: bounce 2s ease-in-out infinite;
  text-decoration: none;
}

.scroll-arrow:hover {
  color: var(--text-primary);
}

@keyframes bounce {
  0%, 100% { transform: translateY(0);    opacity: 1;   }
  50%      { transform: translateY(10px); opacity: 0.5; }
}


/* ============================================================
   ABOUT
   ============================================================ */
.about-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 3rem;
  align-items: start;
}

.bio-text {
  color: var(--text-secondary);
  margin-bottom: 1.2rem;
  line-height: 1.8;
}

.btn-scholar {
  margin-top: 0.5rem;
}

.about-stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.2rem;
}

.stat-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-left: 3px solid var(--accent-gold);
  border-radius: var(--radius-card);
  padding: 1.5rem;
  text-align: center;
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.stat-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-gold);
}

.stat-icon {
  font-size: 1.4rem;
  color: var(--accent-gold);
  margin-bottom: 0.5rem;
}

.stat-number {
  font-family: var(--ff-mono);
  font-size: 2.2rem;
  font-weight: 700;
  color: var(--accent-gold);
  display: inline;
}

.stat-suffix {
  font-family: var(--ff-mono);
  font-size: 1.4rem;
  color: var(--accent-gold);
  display: inline;
}

.stat-label {
  font-size: var(--fs-xs);
  color: var(--text-secondary);
  margin-top: 0.4rem;
  line-height: 1.4;
}


/* ============================================================
   EXPERIENCE
   ============================================================ */
.experience-tabs {
  display: flex;
  justify-content: center;
  gap: 0.5rem;
  margin-bottom: 3rem;
  flex-wrap: wrap;
}

.tab-btn {
  font-family: var(--ff-body);
  font-size: var(--fs-sm);
  font-weight: 500;
  color: var(--text-secondary);
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  padding: 0.7rem 1.5rem;
  border-radius: 30px;
  cursor: pointer;
  transition: all var(--transition-base);
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.tab-btn:hover {
  border-color: var(--border-gold);
  color: var(--accent-gold);
}

.tab-btn.active {
  background: linear-gradient(135deg, var(--accent-gold), #E8C06A);
  color: var(--bg-primary);
  border-color: transparent;
}

.tab-content {
  display: none;
  animation: fadeInUp 0.5s ease;
}

.tab-content.active {
  display: block;
}

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

/* Timeline */
.timeline {
  position: relative;
  max-width: 900px;
  margin: 0 auto;
  padding-left: 40px;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 15px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom, var(--accent-gold), transparent);
}

.timeline-item {
  position: relative;
  margin-bottom: 2.5rem;
  padding-left: 2rem;
}

.timeline-node {
  position: absolute;
  left: -33px;
  top: 1.2rem;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--accent-gold);
  border: 3px solid var(--bg-primary);
  box-shadow: 0 0 0 3px var(--accent-gold-dim);
  transition: box-shadow var(--transition-base);
  z-index: 1;
}

.timeline-item:hover .timeline-node {
  box-shadow: 0 0 0 4px rgba(212, 169, 74, 0.3),
              0 0 20px rgba(212, 169, 74, 0.4);
}

.timeline-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-card);
  padding: 1.5rem;
  transition: transform var(--transition-base),
              box-shadow var(--transition-base),
              border-color var(--transition-base);
}

.timeline-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 0 0 1px var(--accent-gold), 0 8px 40px rgba(212, 169, 74, 0.2);
  border-color: var(--border-gold);
}

.timeline-date {
  display: inline-block;
  font-family: var(--ff-mono);
  font-size: var(--fs-xs);
  color: var(--accent-gold);
  background: rgba(212, 169, 74, 0.08);
  padding: 0.2rem 0.8rem;
  border-radius: 20px;
  margin-bottom: 0.6rem;
}

.timeline-role {
  font-family: var(--ff-display);
  font-size: var(--fs-h3);
  margin-bottom: 0.3rem;
}

.timeline-org {
  font-family: var(--ff-body);
  font-size: var(--fs-sm);
  font-weight: 500;
  color: var(--accent-gold-dim);
  margin-bottom: 0.3rem;
}

.timeline-location {
  font-size: var(--fs-xs);
  color: var(--text-tertiary);
  margin-bottom: 0.5rem;
}

.timeline-location i {
  margin-right: 0.3rem;
}

.timeline-desc {
  color: var(--text-secondary);
  font-size: var(--fs-sm);
  line-height: 1.6;
}

/* Featured Research Card */
.timeline-card-featured {
  border-color: var(--border-gold);
  background: linear-gradient(135deg, var(--bg-surface), var(--bg-elevated));
}

.timeline-badge {
  margin-bottom: 0.8rem;
}

.badge-eu {
  display: inline-block;
  font-family: var(--ff-mono);
  font-size: var(--fs-xs);
  font-weight: 500;
  color: var(--accent-gold);
  background: rgba(212, 169, 74, 0.12);
  border: 1px solid var(--border-gold);
  padding: 0.3rem 0.8rem;
  border-radius: 4px;
}

.timeline-highlights {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 1rem;
}

.highlight-tag {
  font-family: var(--ff-mono);
  font-size: var(--fs-xs);
  color: var(--text-secondary);
  background: rgba(212, 169, 74, 0.06);
  border: 1px solid var(--border-subtle);
  padding: 0.25rem 0.6rem;
  border-radius: 4px;
}

.highlight-tag i {
  color: var(--accent-gold);
  margin-right: 0.3rem;
}

.timeline-node-featured {
  width: 18px;
  height: 18px;
  left: -35px;
  box-shadow: 0 0 0 4px rgba(212, 169, 74, 0.3),
              0 0 20px rgba(212, 169, 74, 0.4);
}


/* ============================================================
   EDUCATION
   ============================================================ */
.education-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.education-card {
  position: relative;
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-card);
  padding: 2rem 1.5rem;
  text-align: center;
  overflow: hidden;
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.education-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-gold);
}

/* Animated gradient border on hover */
.edu-card-glow {
  position: absolute;
  inset: -2px;
  border-radius: var(--radius-card);
  background: conic-gradient(from 0deg, var(--accent-gold), transparent, var(--accent-gold));
  z-index: -1;
  opacity: 0;
  transition: opacity var(--transition-base);
  animation: rotateBorder 4s linear infinite paused;
}

.education-card:hover .edu-card-glow {
  opacity: 1;
  animation-play-state: running;
}

@keyframes rotateBorder {
  to { transform: rotate(360deg); }
}

.edu-flag {
  font-size: 2rem;
  margin-bottom: 0.8rem;
}

.edu-icon {
  font-size: 1.5rem;
  color: var(--accent-gold);
  margin-bottom: 0.8rem;
}

.edu-degree {
  font-family: var(--ff-display);
  font-style: italic;
  font-size: var(--fs-h3);
  margin-bottom: 0.5rem;
}

.edu-institution {
  font-family: var(--ff-body);
  font-size: var(--fs-sm);
  font-weight: 500;
  color: var(--accent-gold-dim);
  margin-bottom: 0.3rem;
}

.edu-department {
  font-size: var(--fs-xs);
  color: var(--text-secondary);
  margin-bottom: 0.8rem;
}

.edu-duration {
  display: inline-block;
  font-family: var(--ff-mono);
  font-size: var(--fs-xs);
  color: var(--accent-gold);
  background: rgba(212, 169, 74, 0.08);
  padding: 0.25rem 0.8rem;
  border-radius: 20px;
}

.edu-duration i {
  margin-right: 0.3rem;
}


/* ============================================================
   SKILLS
   ============================================================ */
.skills-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
}

.skills-subtitle {
  font-family: var(--ff-display);
  font-size: var(--fs-h3);
  margin-bottom: 1.5rem;
  color: var(--text-primary);
}

.skills-subtitle i {
  color: var(--accent-gold);
  margin-right: 0.5rem;
}

/* Skill Tags */
.skill-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

.skill-tag {
  font-family: var(--ff-body);
  font-size: var(--fs-sm);
  color: var(--accent-gold);
  border: 1px solid var(--border-gold);
  padding: 0.5rem 1rem;
  border-radius: 30px;
  background: transparent;
  transition: all var(--transition-base);
  cursor: default;
}

.skill-tag:hover {
  background: rgba(212, 169, 74, 0.12);
  transform: translateY(-2px);
}

.skill-tag i {
  margin-right: 0.4rem;
  font-size: var(--fs-xs);
}

/* Skill Bars */
.skill-bars {
  display: flex;
  flex-direction: column;
  gap: 1.2rem;
}

.skill-bar-item {
  width: 100%;
}

.skill-bar-header {
  display: flex;
  justify-content: space-between;
  margin-bottom: 0.4rem;
}

.skill-bar-name {
  font-family: var(--ff-body);
  font-size: var(--fs-sm);
  font-weight: 500;
  color: var(--text-primary);
}

.skill-bar-percent {
  font-family: var(--ff-mono);
  font-size: var(--fs-xs);
  color: var(--accent-gold);
}

.skill-bar-track {
  width: 100%;
  height: 8px;
  background: var(--bg-elevated);
  border-radius: 4px;
  overflow: hidden;
}

.skill-bar-fill {
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, var(--accent-gold), #F0C060);
  border-radius: 4px;
  transition: width 1.2s cubic-bezier(0.4, 0, 0.2, 1);
}

.skill-bar-fill.animated {
  /* Width is set via JS */
}


/* ============================================================
   AWARDS & LEADERSHIP
   ============================================================ */
.awards-subsection {
  margin-bottom: 3rem;
}

.subsection-title {
  font-family: var(--ff-display);
  font-size: var(--fs-h3);
  margin-bottom: 1.5rem;
  text-align: center;
  color: var(--text-primary);
}

.subsection-title i {
  color: var(--accent-gold);
  margin-right: 0.5rem;
}

.awards-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.2rem;
}

.award-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-card);
  padding: 1.5rem;
  text-align: center;
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.award-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-gold);
}

.award-icon {
  font-size: 2rem;
  color: var(--accent-gold);
  margin-bottom: 0.8rem;
}

.award-name {
  font-family: var(--ff-display);
  font-size: var(--fs-body);
  font-weight: 600;
  margin-bottom: 0.3rem;
}

.award-detail {
  font-size: var(--fs-xs);
  color: var(--text-secondary);
  margin-bottom: 0.3rem;
  line-height: 1.4;
}

.award-org {
  font-size: var(--fs-xs);
  color: var(--accent-gold-dim);
  font-weight: 500;
}

/* Leadership */
.leadership-list {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  max-width: 800px;
  margin: 0 auto;
}

.leadership-item {
  display: flex;
  align-items: center;
  gap: 1rem;
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 1rem 1.2rem;
  transition: transform var(--transition-base), border-color var(--transition-base);
}

.leadership-item:hover {
  transform: translateY(-3px);
  border-color: var(--border-gold);
}

.leadership-icon {
  font-size: 1.3rem;
  color: var(--accent-gold);
  min-width: 2rem;
  text-align: center;
}

.leadership-role {
  font-family: var(--ff-body);
  font-size: var(--fs-sm);
  font-weight: 600;
  margin-bottom: 0.15rem;
}

.leadership-org {
  font-size: var(--fs-xs);
  color: var(--text-secondary);
  line-height: 1.4;
}


/* ============================================================
   CONTACT
   ============================================================ */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: start;
}

.contact-intro {
  color: var(--text-secondary);
  margin-bottom: 2rem;
  line-height: 1.7;
}

.contact-details {
  display: flex;
  flex-direction: column;
  gap: 1.2rem;
  margin-bottom: 2rem;
}

.contact-item {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.contact-icon {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: rgba(212, 169, 74, 0.08);
  border: 1px solid var(--border-gold);
  color: var(--accent-gold);
  font-size: 1rem;
  flex-shrink: 0;
}

.contact-label {
  display: block;
  font-size: var(--fs-xs);
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 0.1rem;
}

.contact-value {
  font-size: var(--fs-sm);
  color: var(--text-primary);
  word-break: break-all;
}

a.contact-value:hover {
  color: var(--accent-gold);
}

/* Reference Card */
.reference-card {
  margin-top: 1rem;
}

.reference-divider {
  width: 100%;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--border-gold), transparent);
  margin-bottom: 1.5rem;
}

.reference-title {
  font-family: var(--ff-mono);
  font-size: var(--fs-xs);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent-gold);
  margin-bottom: 0.6rem;
}

.reference-name {
  font-family: var(--ff-display);
  font-size: var(--fs-body);
  font-weight: 600;
  margin-bottom: 0.15rem;
}

.reference-role {
  font-size: var(--fs-sm);
  color: var(--text-secondary);
  margin-bottom: 0.1rem;
}

.reference-org {
  font-size: var(--fs-xs);
  color: var(--text-tertiary);
  margin-bottom: 0.5rem;
}

.reference-email {
  font-size: var(--fs-sm);
  color: var(--accent-gold);
}

.reference-email i {
  margin-right: 0.3rem;
}

/* Contact Form */
.contact-form-wrapper {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-card);
  padding: 2rem;
}

.form-group {
  margin-bottom: 1.2rem;
}

.form-label {
  display: block;
  font-size: var(--fs-sm);
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 0.4rem;
}

.form-control {
  width: 100%;
  padding: 0.75rem 1rem;
  font-family: var(--ff-body);
  font-size: var(--fs-sm);
  color: var(--text-primary);
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  transition: border-color var(--transition-base), box-shadow var(--transition-base);
  outline: none;
}

.form-control::placeholder {
  color: var(--text-tertiary);
}

.form-control:focus {
  border-color: var(--accent-gold);
  box-shadow: 0 0 0 3px rgba(212, 169, 74, 0.15);
}

textarea.form-control {
  resize: vertical;
  min-height: 120px;
}

.form-error {
  display: block;
  font-size: var(--fs-xs);
  color: #f87171;
  margin-top: 0.3rem;
}

.btn-submit {
  width: 100%;
  justify-content: center;
  padding: 0.9rem;
  font-size: var(--fs-body);
  margin-top: 0.5rem;
}

.btn-submit .btn-loading {
  display: none;
}

.btn-submit.loading .btn-text {
  display: none;
}

.btn-submit.loading .btn-loading {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}


/* ============================================================
   FOOTER
   ============================================================ */
.footer {
  padding: 3rem 0 2rem;
  border-top: 1px solid var(--border-gold);
  background: var(--bg-surface);
}

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

.footer-monogram {
  font-family: var(--ff-display);
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--accent-gold);
  border: 2px solid var(--accent-gold);
  padding: 0.15rem 0.6rem;
  border-radius: 4px;
  display: inline-block;
  margin-bottom: 0.8rem;
}

.footer-name {
  font-family: var(--ff-display);
  font-size: var(--fs-h3);
  margin-bottom: 0.3rem;
}

.footer-tagline {
  color: var(--text-secondary);
  font-size: var(--fs-sm);
  margin-bottom: 1.5rem;
}

.footer-nav {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.5rem 1.5rem;
  margin-bottom: 1.5rem;
}

.footer-link {
  font-size: var(--fs-sm);
  color: var(--text-secondary);
  text-decoration: none;
  transition: color var(--transition-base);
}

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

.footer-social {
  display: flex;
  justify-content: center;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.social-icon {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  border: 1px solid var(--border-gold);
  color: var(--accent-gold);
  font-size: 1rem;
  transition: all var(--transition-base);
  text-decoration: none;
}

.social-icon:hover {
  background: rgba(212, 169, 74, 0.1);
  transform: translateY(-3px);
  color: var(--accent-gold);
}

.footer-bottom {
  padding-top: 1rem;
  border-top: 1px solid var(--border-subtle);
}

.footer-copyright {
  font-size: var(--fs-xs);
  color: var(--text-tertiary);
  margin-bottom: 0.2rem;
}

.footer-credit {
  font-size: var(--fs-xs);
  color: var(--text-tertiary);
}


/* ============================================================
   BACK TO TOP
   ============================================================ */
.back-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--accent-gold);
  color: var(--bg-primary);
  border: none;
  cursor: pointer;
  font-size: 1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 999;
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  transition: all var(--transition-base);
  box-shadow: 0 4px 20px rgba(212, 169, 74, 0.3);
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  transform: translateY(-3px);
  box-shadow: 0 6px 30px rgba(212, 169, 74, 0.45);
}


/* ============================================================
   RESPONSIVE BREAKPOINTS
   ============================================================ */

/* Tablet — 768px */
@media (max-width: 768px) {
  .nav-links {
    display: none;
  }

  .hamburger {
    display: flex;
  }

  /* Hero */
  .hero-photo {
    width: 140px;
    height: 140px;
  }

  .hero-cta {
    flex-direction: column;
    gap: 0.8rem;
  }

  .hero-cta .btn {
    width: 100%;
    max-width: 280px;
    justify-content: center;
  }

  /* About */
  .about-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

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

  /* Experience Timeline */
  .timeline {
    padding-left: 30px;
  }

  .timeline::before {
    left: 10px;
  }

  .timeline-node {
    left: -27px;
  }

  .timeline-node-featured {
    left: -29px;
  }

  /* Education */
  .education-grid {
    grid-template-columns: 1fr;
    gap: 1.2rem;
  }

  /* Skills */
  .skills-grid {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }

  /* Awards */
  .awards-grid {
    grid-template-columns: 1fr;
  }

  .leadership-list {
    grid-template-columns: 1fr;
  }

  /* Contact */
  .contact-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
}

/* Small mobile — 576px */
@media (max-width: 576px) {
  .hero-photo {
    width: 120px;
    height: 120px;
  }

  .hero-name {
    font-size: clamp(2rem, 10vw, 2.8rem);
  }

  .about-stats {
    grid-template-columns: 1fr 1fr;
    gap: 0.8rem;
  }

  .stat-card {
    padding: 1rem;
  }

  .stat-number {
    font-size: 1.8rem;
  }

  .timeline {
    padding-left: 25px;
  }

  .timeline::before {
    left: 8px;
  }

  .timeline-node {
    left: -24px;
    width: 12px;
    height: 12px;
  }

  .timeline-node-featured {
    left: -25px;
    width: 14px;
    height: 14px;
  }

  .contact-form-wrapper {
    padding: 1.5rem;
  }

  .messages-container {
    right: 10px;
    left: 10px;
    max-width: 100%;
  }

  .back-to-top {
    bottom: 20px;
    right: 20px;
    width: 38px;
    height: 38px;
  }
}

/* Large desktop — 992px+ (dual-column timeline) */
@media (min-width: 992px) {
  .timeline {
    padding-left: 0;
    max-width: 1000px;
  }

  .timeline::before {
    left: 50%;
    transform: translateX(-50%);
  }

  .timeline-item {
    width: 50%;
    padding-left: 0;
    margin-bottom: 2.5rem;
  }

  .timeline-item:nth-child(odd) {
    margin-left: 0;
    padding-right: 3rem;
    text-align: right;
  }

  .timeline-item:nth-child(even) {
    margin-left: 50%;
    padding-left: 3rem;
  }

  .timeline-item:nth-child(odd) .timeline-node {
    left: auto;
    right: -8px;
  }

  .timeline-item:nth-child(even) .timeline-node {
    left: -8px;
  }

  .timeline-item:nth-child(odd) .timeline-card {
    text-align: left;
  }

  /* Featured research item always centered on large */
  .timeline-item-featured {
    width: 70%;
    margin-left: 15% !important;
    padding-left: 3rem !important;
    padding-right: 3rem !important;
  }

  .timeline-item-featured .timeline-node {
    left: -8px !important;
    right: auto !important;
  }
}

/* XL desktop */
@media (min-width: 1200px) {
  :root {
    --container-max: 1200px;
  }
}


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

  .scroll-arrow {
    animation: none;
  }

  .skill-bar-fill {
    transition: none;
  }
}


/* ============================================================
   PRINT STYLES
   ============================================================ */
@media print {
  .navbar,
  .page-loader,
  .back-to-top,
  .particles-canvas,
  .hero-grain,
  .scroll-arrow,
  .hamburger,
  .mobile-menu,
  .messages-container {
    display: none !important;
  }

  body {
    background: #fff;
    color: #111;
  }

  .hero {
    min-height: auto;
    padding: 2rem 0;
  }

  .section {
    break-inside: avoid;
  }
}