/* ==========================================================================
   Design Tokens & CSS Variables - Manas Mohnot Personal Webpage (Light Theme)
   ========================================================================== */

:root {
  /* Colors */
  --bg-primary: #f8fafc;
  --bg-surface: #ffffff;
  --bg-surface-elevated: #ffffff;
  --bg-subtle: #f1f5f9;
  --bg-muted: #e2e8f0;
  
  --border-subtle: #f1f5f9;
  --border-default: #e2e8f0;
  --border-hover: #cbd5e1;
  --border-focus: #3b82f6;

  --text-primary: #0f172a;
  --text-secondary: #334155;
  --text-muted: #64748b;
  --text-inverse: #ffffff;

  --primary-50: #eff6ff;
  --primary-100: #dbeafe;
  --primary-200: #bfdbfe;
  --primary-500: #3b82f6;
  --primary-600: #2563eb;
  --primary-700: #1d4ed8;

  --success-50: #f0fdf4;
  --success-600: #16a34a;
  --success-border: #bbf7d0;

  /* Shadows */
  --shadow-xs: 0 1px 2px 0 rgba(15, 23, 42, 0.04);
  --shadow-sm: 0 1px 3px 0 rgba(15, 23, 42, 0.06), 0 1px 2px -1px rgba(15, 23, 42, 0.04);
  --shadow-md: 0 4px 6px -1px rgba(15, 23, 42, 0.07), 0 2px 4px -2px rgba(15, 23, 42, 0.05);
  --shadow-lg: 0 10px 15px -3px rgba(15, 23, 42, 0.08), 0 4px 6px -4px rgba(15, 23, 42, 0.04);
  --shadow-xl: 0 20px 25px -5px rgba(15, 23, 42, 0.08), 0 8px 10px -6px rgba(15, 23, 42, 0.03);

  /* Typography */
  --font-sans: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;

  /* Sizing & Spacing */
  --container-max-width: 1040px;
  --header-height: 72px;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-smooth: 350ms cubic-bezier(0.16, 1, 0.3, 1);
}

/* ==========================================================================
   Reset & Base Styles
   ========================================================================== */

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-height) + 1.5rem);
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-secondary);
  line-height: 1.65;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

::selection {
  background-color: var(--primary-100);
  color: var(--primary-700);
}

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

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition-fast);
}

button, input, textarea, select {
  font: inherit;
  color: inherit;
}

button {
  background: none;
  border: none;
  cursor: pointer;
}

ul, ol {
  list-style: none;
}

/* ==========================================================================
   Layout Containers & Utilities
   ========================================================================== */

.container {
  width: 100%;
  max-width: var(--container-max-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: 1.5rem;
  padding-right: 1.5rem;
}

.section {
  padding-top: 5rem;
  padding-bottom: 5rem;
}

.section-header {
  margin-bottom: 2.5rem;
}

.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.8125rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--primary-600);
  background-color: var(--primary-50);
  padding: 0.25rem 0.75rem;
  border-radius: var(--radius-full);
  border: 1px solid var(--primary-200);
  margin-bottom: 0.75rem;
}

.section-title {
  font-size: 2rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.03em;
  line-height: 1.25;
}

.section-desc {
  margin-top: 0.5rem;
  font-size: 1.0625rem;
  color: var(--text-muted);
  max-width: 620px;
}

/* ==========================================================================
   Header & Navigation
   ========================================================================== */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  height: var(--header-height);
  background-color: rgba(248, 250, 252, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(226, 232, 240, 0.8);
  transition: background-color var(--transition-base), border-color var(--transition-base), box-shadow var(--transition-base);
}

.site-header.scrolled {
  background-color: rgba(255, 255, 255, 0.92);
  border-bottom-color: var(--border-default);
  box-shadow: var(--shadow-sm);
}

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

.brand-logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}

.brand-avatar {
  width: 38px;
  height: 38px;
  border-radius: var(--radius-md);
  background: var(--bg-surface);
  border: 1px solid var(--border-default);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 0.875rem;
  color: var(--primary-600);
  box-shadow: var(--shadow-xs);
  overflow: hidden;
  transition: transform var(--transition-fast), border-color var(--transition-fast);
}

.brand-avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.brand-logo:hover .brand-avatar {
  transform: translateY(-1px);
  border-color: var(--primary-500);
}

.brand-name {
  font-size: 1.0625rem;
}

.brand-status {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--success-600);
  background: var(--success-50);
  border: 1px solid var(--success-border);
  padding: 0.125rem 0.5rem;
  border-radius: var(--radius-full);
  margin-left: 0.25rem;
}

.status-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--success-600);
  display: inline-block;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.nav-link {
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--text-muted);
  padding: 0.5rem 0.25rem;
  position: relative;
  transition: color var(--transition-fast);
}

.nav-link:hover,
.nav-link.active {
  color: var(--text-primary);
}

.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background-color: var(--primary-600);
  border-radius: var(--radius-full);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.btn-header {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 1rem;
  font-size: 0.875rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  background-color: var(--text-primary);
  color: var(--text-inverse);
  box-shadow: var(--shadow-xs);
  transition: background-color var(--transition-fast), transform var(--transition-fast);
}

.btn-header:hover {
  background-color: #1e293b;
  transform: translateY(-1px);
}

.mobile-menu-toggle {
  display: none;
  padding: 0.5rem;
  color: var(--text-primary);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-default);
  background: var(--bg-surface);
}

/* ==========================================================================
   Hero Section
   ========================================================================== */

.hero-section {
  padding-top: 4rem;
  padding-bottom: 4rem;
  position: relative;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 3.5rem;
  align-items: center;
}

.hero-content {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.hero-availability {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--text-secondary);
  background-color: var(--bg-surface);
  border: 1px solid var(--border-default);
  padding: 0.375rem 0.875rem;
  border-radius: var(--radius-full);
  box-shadow: var(--shadow-xs);
  margin-bottom: 1.5rem;
}

.pulse-indicator {
  width: 8px;
  height: 8px;
  background-color: #10b981;
  border-radius: 50%;
  position: relative;
}

.pulse-indicator::after {
  content: '';
  position: absolute;
  inset: -3px;
  border-radius: 50%;
  background-color: rgba(16, 185, 129, 0.35);
  animation: pulseEffect 2s infinite ease-out;
}

@keyframes pulseEffect {
  0% { transform: scale(0.9); opacity: 0.9; }
  70% { transform: scale(1.8); opacity: 0; }
  100% { transform: scale(1.8); opacity: 0; }
}

.hero-title {
  font-size: 3rem;
  font-weight: 800;
  letter-spacing: -0.035em;
  line-height: 1.15;
  color: var(--text-primary);
  margin-bottom: 1rem;
}

.hero-title .highlight {
  color: var(--primary-600);
}

.hero-subtitle {
  font-size: 1.25rem;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 1.25rem;
  line-height: 1.45;
}

.hero-bio {
  font-size: 1.0625rem;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 2rem;
  max-width: 580px;
}

.hero-meta-items {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 2rem;
}

.meta-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.875rem;
  color: var(--text-secondary);
  background: var(--bg-surface);
  padding: 0.375rem 0.875rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-default);
  box-shadow: var(--shadow-xs);
}

.meta-pill svg {
  color: var(--primary-600);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  align-items: center;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.625rem;
  padding: 0.75rem 1.375rem;
  font-size: 0.9375rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  text-align: center;
  white-space: nowrap;
}

.btn-primary {
  background-color: var(--primary-600);
  color: var(--text-inverse);
  box-shadow: 0 1px 2px rgba(37, 99, 235, 0.2), 0 4px 8px rgba(37, 99, 235, 0.15);
}

.btn-primary:hover {
  background-color: var(--primary-700);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.25);
}

.btn-secondary {
  background-color: var(--bg-surface);
  color: var(--text-primary);
  border: 1px solid var(--border-default);
  box-shadow: var(--shadow-xs);
}

.btn-secondary:hover {
  background-color: var(--bg-subtle);
  border-color: var(--border-hover);
  transform: translateY(-1px);
}

.btn-icon-copy {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  background-color: var(--bg-surface);
  border: 1px solid var(--border-default);
  color: var(--text-secondary);
  box-shadow: var(--shadow-xs);
  transition: all var(--transition-fast);
  position: relative;
}

.btn-icon-copy:hover {
  color: var(--primary-600);
  border-color: var(--primary-200);
  background-color: var(--primary-50);
}

/* Hero Visual / Card Showcase */
.hero-visual {
  position: relative;
}

.hero-profile-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-xl);
  padding: 2rem;
  box-shadow: var(--shadow-xl);
  position: relative;
  overflow: hidden;
}

.hero-profile-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 6px;
  background: linear-gradient(90deg, var(--primary-600), #38bdf8);
}

.profile-avatar-wrap {
  position: relative;
  width: 140px;
  height: 140px;
  margin: 0 auto 1.5rem;
}

.profile-avatar-img {
  width: 100%;
  height: 100%;
  border-radius: 50%;
  object-fit: cover;
  object-position: center 15%;
  border: 4px solid var(--bg-surface);
  box-shadow: 0 8px 20px -4px rgba(15, 23, 42, 0.12), 0 4px 8px -2px rgba(15, 23, 42, 0.06);
}

.profile-card-details {
  text-align: center;
}

.profile-card-name {
  font-size: 1.375rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.25rem;
}

.profile-card-role {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--primary-600);
  margin-bottom: 1.25rem;
}

.profile-quick-stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.75rem;
  padding: 1.25rem 0;
  border-top: 1px solid var(--border-subtle);
  border-bottom: 1px solid var(--border-subtle);
  margin-bottom: 1.25rem;
}

.stat-item {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.stat-val {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--text-primary);
}

.stat-lbl {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.profile-social-row {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
}

.social-icon-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-default);
  background: var(--bg-subtle);
  color: var(--text-secondary);
  transition: all var(--transition-fast);
}

.social-icon-btn:hover {
  background: var(--primary-50);
  border-color: var(--primary-200);
  color: var(--primary-600);
  transform: translateY(-2px);
}

/* ==========================================================================
   About Section
   ========================================================================== */

.about-section {
  background-color: var(--bg-surface);
  border-top: 1px solid var(--border-default);
  border-bottom: 1px solid var(--border-default);
}

.about-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 3.5rem;
  align-items: start;
}

.about-text p {
  margin-bottom: 1.25rem;
  font-size: 1.0625rem;
  color: var(--text-secondary);
  line-height: 1.75;
}

.about-text p:last-child {
  margin-bottom: 0;
}

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

.pillar-card {
  display: flex;
  gap: 1.25rem;
  padding: 1.25rem;
  border-radius: var(--radius-lg);
  background: var(--bg-primary);
  border: 1px solid var(--border-default);
  transition: transform var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.pillar-card:hover {
  transform: translateY(-2px);
  border-color: var(--border-hover);
  box-shadow: var(--shadow-sm);
}

.pillar-icon {
  width: 42px;
  height: 42px;
  border-radius: var(--radius-md);
  background: var(--primary-50);
  color: var(--primary-600);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  border: 1px solid var(--primary-200);
}

.pillar-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.25rem;
}

.pillar-desc {
  font-size: 0.875rem;
  color: var(--text-muted);
  line-height: 1.55;
}

/* ==========================================================================
   Experience Section
   ========================================================================== */

.timeline {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.timeline::before {
  content: '';
  position: absolute;
  top: 1rem;
  bottom: 1rem;
  left: 1.25rem;
  width: 2px;
  background-color: var(--border-default);
}

.timeline-item {
  position: relative;
  padding-left: 3.5rem;
}

.timeline-marker {
  position: absolute;
  left: 0.75rem;
  top: 1.25rem;
  width: 1rem;
  height: 1rem;
  border-radius: 50%;
  background: var(--bg-surface);
  border: 3px solid var(--primary-600);
  box-shadow: 0 0 0 4px var(--bg-primary);
  z-index: 2;
}

.timeline-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  box-shadow: var(--shadow-xs);
  transition: all var(--transition-fast);
}

.timeline-card:hover {
  border-color: var(--border-hover);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.timeline-header {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: flex-start;
  gap: 0.5rem;
  margin-bottom: 0.75rem;
}

.timeline-role {
  font-size: 1.1875rem;
  font-weight: 700;
  color: var(--text-primary);
}

.timeline-company {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--primary-600);
}

.timeline-period {
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--text-muted);
  background: var(--bg-subtle);
  padding: 0.25rem 0.625rem;
  border-radius: var(--radius-full);
}

.timeline-body {
  font-size: 0.9375rem;
  color: var(--text-secondary);
  line-height: 1.65;
  margin-bottom: 1rem;
}

.timeline-bullets {
  list-style: none;
  margin-bottom: 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.timeline-bullets li {
  position: relative;
  padding-left: 1.25rem;
  font-size: 0.9375rem;
  color: var(--text-secondary);
}

.timeline-bullets li::before {
  content: '›';
  position: absolute;
  left: 0;
  top: -2px;
  font-weight: 700;
  color: var(--primary-600);
  font-size: 1.125rem;
}

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

.tech-tag {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-secondary);
  background: var(--bg-subtle);
  border: 1px solid var(--border-default);
  padding: 0.25rem 0.625rem;
  border-radius: var(--radius-sm);
}

/* ==========================================================================
   Projects Section
   ========================================================================== */

.projects-filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 2rem;
}

.filter-btn {
  padding: 0.4375rem 1rem;
  font-size: 0.875rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  color: var(--text-muted);
  background: var(--bg-surface);
  border: 1px solid var(--border-default);
  transition: all var(--transition-fast);
}

.filter-btn:hover {
  color: var(--text-primary);
  border-color: var(--border-hover);
}

.filter-btn.active {
  color: var(--text-inverse);
  background-color: var(--text-primary);
  border-color: var(--text-primary);
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(310px, 1fr));
  gap: 1.5rem;
}

.project-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  box-shadow: var(--shadow-xs);
  transition: all var(--transition-fast);
  position: relative;
}

.project-card:hover {
  border-color: var(--border-hover);
  box-shadow: var(--shadow-lg);
  transform: translateY(-3px);
}

.project-card-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1rem;
}

.project-icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  background: var(--primary-50);
  border: 1px solid var(--primary-200);
  color: var(--primary-600);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.project-links {
  display: flex;
  gap: 0.5rem;
}

.project-link-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  transition: color var(--transition-fast), background var(--transition-fast);
}

.project-link-icon:hover {
  color: var(--primary-600);
  background: var(--bg-subtle);
}

.project-title {
  font-size: 1.1875rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
}

.project-desc {
  font-size: 0.9375rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 1.25rem;
}

.project-card-footer {
  margin-top: auto;
  padding-top: 1rem;
  border-top: 1px solid var(--border-subtle);
}

/* ==========================================================================
   Skills & Expertise Section
   ========================================================================== */

.skills-section {
  background-color: var(--bg-surface);
  border-top: 1px solid var(--border-default);
  border-bottom: 1px solid var(--border-default);
}

.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.5rem;
}

.skill-group-card {
  background: var(--bg-primary);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.skill-group-card:hover {
  border-color: var(--border-hover);
  box-shadow: var(--shadow-sm);
}

.skill-group-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1.25rem;
}

.skill-group-icon {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-md);
  background: var(--bg-surface);
  border: 1px solid var(--border-default);
  color: var(--primary-600);
  display: flex;
  align-items: center;
  justify-content: center;
}

.skill-group-title {
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--text-primary);
}

.skill-items-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.skill-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--text-secondary);
  background: var(--bg-surface);
  border: 1px solid var(--border-default);
  padding: 0.3125rem 0.625rem;
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.skill-badge:hover {
  border-color: var(--primary-500);
  color: var(--primary-700);
  background: var(--primary-50);
}

/* ==========================================================================
   Education & Credentials Section
   ========================================================================== */

.edu-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
}

.edu-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  box-shadow: var(--shadow-xs);
  display: flex;
  gap: 1.25rem;
  transition: all var(--transition-fast);
}

.edu-card:hover {
  border-color: var(--border-hover);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.edu-icon-wrap {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  background: var(--primary-50);
  border: 1px solid var(--primary-200);
  color: var(--primary-600);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.edu-title {
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.25rem;
}

.edu-institution {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--primary-600);
  margin-bottom: 0.25rem;
}

.edu-meta {
  font-size: 0.8125rem;
  color: var(--text-muted);
  margin-bottom: 0.75rem;
}

.edu-details {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ==========================================================================
   Contact & Connect Section
   ========================================================================== */

.contact-card-main {
  background: var(--bg-surface);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-xl);
  padding: 3rem;
  box-shadow: var(--shadow-lg);
}

.contact-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3.5rem;
}

.contact-info-col {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.contact-direct-list {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  margin: 2rem 0;
}

.direct-channel-item {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1rem 1.25rem;
  background: var(--bg-primary);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.direct-channel-item:hover {
  background: var(--primary-50);
  border-color: var(--primary-200);
}

.channel-icon {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  background: var(--bg-surface);
  border: 1px solid var(--border-default);
  color: var(--primary-600);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.channel-info {
  flex-grow: 1;
}

.channel-label {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
}

.channel-value {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--text-primary);
}

.contact-form-col {
  background: var(--bg-primary);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-lg);
  padding: 2rem;
}

.form-title {
  font-size: 1.1875rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 1.5rem;
}

.form-group {
  margin-bottom: 1.25rem;
}

.form-label {
  display: block;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 0.375rem;
}

.form-input,
.form-textarea {
  width: 100%;
  padding: 0.75rem 1rem;
  font-size: 0.9375rem;
  color: var(--text-primary);
  background: var(--bg-surface);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.form-input:focus,
.form-textarea:focus {
  outline: none;
  border-color: var(--primary-500);
  box-shadow: 0 0 0 3px var(--primary-100);
}

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

/* ==========================================================================
   Footer
   ========================================================================== */

.site-footer {
  background-color: var(--bg-surface);
  border-top: 1px solid var(--border-default);
  padding: 3rem 0 2rem;
}

.footer-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1.5rem;
  padding-bottom: 2rem;
  border-bottom: 1px solid var(--border-subtle);
  margin-bottom: 2rem;
}

.footer-brand {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.footer-name {
  font-weight: 700;
  font-size: 1.125rem;
  color: var(--text-primary);
}

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

.footer-links {
  display: flex;
  gap: 1.5rem;
}

.footer-link {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-muted);
  transition: color var(--transition-fast);
}

.footer-link:hover {
  color: var(--primary-600);
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
  font-size: 0.8125rem;
  color: var(--text-muted);
}

.back-to-top {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  font-weight: 600;
  color: var(--text-secondary);
  padding: 0.375rem 0.75rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-default);
  background: var(--bg-surface);
  transition: all var(--transition-fast);
}

.back-to-top:hover {
  background: var(--bg-subtle);
  color: var(--primary-600);
}

/* ==========================================================================
   Toast Notification / Modal / Utilities
   ========================================================================== */

.toast-container {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  z-index: 100;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  pointer-events: none;
}

.toast {
  pointer-events: auto;
  background-color: var(--text-primary);
  color: var(--text-inverse);
  padding: 0.75rem 1.25rem;
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: 0.625rem;
  box-shadow: var(--shadow-lg);
  transform: translateY(20px);
  opacity: 0;
  transition: all var(--transition-smooth);
}

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

/* ==========================================================================
   Responsive Breakpoints
   ========================================================================== */

@media (max-width: 992px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 3rem;
  }

  .about-grid {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }

  .contact-layout {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }

  .contact-card-main {
    padding: 2rem;
  }
}

@media (max-width: 768px) {
  .section {
    padding-top: 3.5rem;
    padding-bottom: 3.5rem;
  }

  .hero-title {
    font-size: 2.25rem;
  }

  .mobile-menu-toggle {
    display: flex;
  }

  .nav-menu {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: var(--bg-surface);
    flex-direction: column;
    align-items: flex-start;
    padding: 1.5rem;
    border-bottom: 1px solid var(--border-default);
    box-shadow: var(--shadow-lg);
    display: none;
  }

  .nav-menu.open {
    display: flex;
  }

  .nav-link {
    width: 100%;
    padding: 0.75rem 0;
  }

  .timeline::before {
    left: 1rem;
  }

  .timeline-marker {
    left: 0.5rem;
  }

  .timeline-item {
    padding-left: 2.75rem;
  }
}