/* ==========================================================================
   Ayush Mishra — Academic & Researcher Portfolio
   Apple-Inspired Design System & Typography
   ========================================================================== */

/* Design Tokens */
:root {
  /* Color Palette - Dark Theme (Default) */
  --bg-body: #08090C;
  --bg-surface: #10121A;
  --bg-surface-elevated: #161924;
  --bg-glass: rgba(16, 18, 26, 0.72);
  --bg-glass-hover: rgba(26, 30, 42, 0.85);
  --bg-subtle: rgba(255, 255, 255, 0.04);
  --bg-card-border: rgba(255, 255, 255, 0.1);
  --bg-card-border-hover: rgba(10, 132, 255, 0.5);

  --text-primary: #F5F5F7;
  --text-secondary: #A1A1A6;
  --text-tertiary: #6E6E73;
  --text-inverse: #08090C;

  --accent-blue: #0A84FF;
  --accent-blue-hover: #0071E3;
  --accent-cyan: #64D2FF;
  --accent-purple: #BF5AF2;
  --accent-green: #30D158;
  --accent-orange: #FF9F0A;
  --accent-red: #FF453A;

  --accent-glow-blue: rgba(10, 132, 255, 0.25);
  --accent-glow-purple: rgba(191, 90, 242, 0.2);

  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'SF Pro Text', 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --font-heading: 'Outfit', 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'JetBrains Mono', SFMono-Regular, Menlo, Monaco, Consolas, monospace;

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --radius-full: 9999px;

  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.2);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.35);
  --shadow-lg: 0 20px 48px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 30px rgba(10, 132, 255, 0.2);

  --transition-fast: 0.15s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-normal: 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-smooth: 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

/* Light Theme Variables */
[data-theme="light"] {
  --bg-body: #FBFBFD;
  --bg-surface: #FFFFFF;
  --bg-surface-elevated: #F2F2F7;
  --bg-glass: rgba(255, 255, 255, 0.82);
  --bg-glass-hover: rgba(255, 255, 255, 0.95);
  --bg-subtle: rgba(0, 0, 0, 0.03);
  --bg-card-border: rgba(0, 0, 0, 0.08);
  --bg-card-border-hover: rgba(0, 113, 227, 0.45);

  --text-primary: #1D1D1F;
  --text-secondary: #515154;
  --text-tertiary: #86868B;
  --text-inverse: #FFFFFF;

  --accent-blue: #0071E3;
  --accent-blue-hover: #0077ED;
  --accent-cyan: #0099CC;
  --accent-purple: #9933CC;
  --accent-green: #28CD41;
  --accent-orange: #F56300;
  --accent-red: #D70015;

  --accent-glow-blue: rgba(0, 113, 227, 0.15);
  --accent-glow-purple: rgba(153, 51, 204, 0.12);

  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 20px 48px rgba(0, 0, 0, 0.12);
  --shadow-glow: 0 0 30px rgba(0, 113, 227, 0.12);
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  background-color: var(--bg-body);
  min-height: 100%;
  width: 100%;
  overflow-x: hidden;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-body);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  min-height: 100dvh;
  width: 100%;
  overflow-x: hidden;
  padding-left: env(safe-area-inset-left, 0px);
  padding-right: env(safe-area-inset-right, 0px);
  transition: background-color var(--transition-normal), color var(--transition-normal);
}

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

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

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

/* Layout Utilities */
.container {
  width: 100%;
  max-width: 1180px;
  margin-left: auto;
  margin-right: auto;
  padding-left: 24px;
  padding-right: 24px;
}

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

.gradient-text {
  background: linear-gradient(135deg, var(--text-primary) 30%, var(--accent-blue) 75%, var(--accent-cyan) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
}

/* Glassmorphism Cards */
.glass-card {
  background: var(--bg-glass);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--bg-card-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-normal), border-color var(--transition-normal), box-shadow var(--transition-normal), background-color var(--transition-normal);
}

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

/* Badges & Pills */
.pill-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  border-radius: var(--radius-full);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

.blue-pill {
  background: rgba(10, 132, 255, 0.15);
  color: var(--accent-blue);
  border: 1px solid rgba(10, 132, 255, 0.25);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 20px;
  font-weight: 500;
  font-size: 0.92rem;
  border-radius: var(--radius-full);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all var(--transition-normal);
  text-decoration: none;
}

.btn-sm {
  padding: 6px 14px;
  font-size: 0.82rem;
}

.btn-lg {
  padding: 12px 24px;
  font-size: 0.98rem;
  font-weight: 600;
}

.btn-primary {
  background-color: var(--accent-blue);
  color: #FFFFFF;
  box-shadow: 0 4px 14px rgba(10, 132, 255, 0.35);
}

.btn-primary:hover {
  background-color: var(--accent-blue-hover);
  box-shadow: 0 6px 20px rgba(10, 132, 255, 0.5);
  transform: translateY(-1px);
}

.btn-secondary {
  background-color: var(--bg-surface-elevated);
  color: var(--text-primary);
  border: 1px solid var(--bg-card-border);
}

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

.btn-glass {
  background: var(--bg-subtle);
  color: var(--text-primary);
  border: 1px solid var(--bg-card-border);
}

.btn-glass:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: var(--accent-blue);
  transform: translateY(-1px);
}

.btn-outline {
  background: transparent;
  color: var(--text-primary);
  border: 1px solid var(--bg-card-border);
}

.btn-outline:hover {
  background: var(--bg-subtle);
  border-color: var(--accent-blue);
}

.btn-block {
  width: 100%;
}

.icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border-radius: var(--radius-full);
  background: var(--bg-subtle);
  border: 1px solid var(--bg-card-border);
  color: var(--text-primary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.icon-btn svg {
  pointer-events: none;
}

.icon-btn:hover {
  background: rgba(255, 255, 255, 0.12);
  border-color: var(--accent-blue);
  transform: scale(1.05);
}

/* ==========================================================================
   Header & Top Announcement Bar
   ========================================================================== */

.top-announcement {
  background: linear-gradient(90deg, rgba(10, 132, 255, 0.12), rgba(191, 90, 242, 0.12));
  border-bottom: 1px solid var(--bg-card-border);
  font-size: 0.82rem;
  padding: 7px 0;
  text-align: center;
}

.announcement-inner {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  flex-wrap: wrap;
}

.announcement-badge {
  background: var(--accent-blue);
  color: #FFFFFF;
  font-weight: 700;
  font-size: 0.68rem;
  padding: 2px 8px;
  border-radius: var(--radius-full);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.announcement-text {
  color: var(--text-secondary);
}

.announcement-text strong {
  color: var(--text-primary);
}

.announcement-link {
  color: var(--accent-blue);
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.announcement-link:hover .arrow {
  transform: translateX(3px);
}

.arrow {
  transition: transform var(--transition-fast);
}

/* Sticky Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--bg-glass);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border-bottom: 1px solid var(--bg-card-border);
  padding: 12px 0;
  transition: all var(--transition-normal);
}

.header-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand-avatar-mark {
  position: relative;
  width: 38px;
  height: 38px;
  flex-shrink: 0;
}

.header-avatar-img {
  width: 38px;
  height: 38px;
  border-radius: 12px;
  object-fit: cover;
  border: 1.5px solid var(--accent-blue);
  box-shadow: 0 2px 8px rgba(10, 132, 255, 0.3);
  transition: transform var(--transition-fast);
}

.brand-logo:hover .header-avatar-img {
  transform: scale(1.06);
}

.avatar-online-dot {
  position: absolute;
  bottom: -2px;
  right: -2px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background-color: var(--accent-green);
  border: 2px solid var(--bg-surface);
  box-shadow: 0 0 6px var(--accent-green);
}

.logo-mark {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--accent-blue), var(--accent-purple));
  color: #FFFFFF;
  font-weight: 800;
  font-size: 0.95rem;
  letter-spacing: -0.5px;
  box-shadow: 0 2px 10px rgba(10, 132, 255, 0.4);
}

.logo-text {
  display: flex;
  flex-direction: column;
}

.logo-name {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.05rem;
  line-height: 1.2;
  color: var(--text-primary);
}

.logo-role {
  font-size: 0.72rem;
  color: var(--text-tertiary);
  font-weight: 500;
}

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

.nav-list {
  display: flex;
  align-items: center;
  gap: 24px;
  list-style: none;
}

.nav-link {
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--text-secondary);
  position: relative;
  padding: 4px 0;
}

.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(--accent-blue);
  border-radius: 2px;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

/* Theme Icon Display Logic */
[data-theme="dark"] .sun-icon {
  display: block;
}
[data-theme="dark"] .moon-icon {
  display: none;
}
[data-theme="light"] .sun-icon {
  display: none;
}
[data-theme="light"] .moon-icon {
  display: block;
}

.mobile-toggle {
  display: none;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  background: var(--bg-subtle);
  border: 1px solid var(--bg-card-border);
  cursor: pointer;
  padding: 8px 7px;
  position: relative;
  flex-direction: column;
  justify-content: space-between;
  align-items: center;
  transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

.mobile-toggle:hover {
  background: rgba(10, 132, 255, 0.15);
  border-color: rgba(10, 132, 255, 0.4);
}

.mobile-toggle .bar {
  width: 100%;
  height: 2px;
  background-color: var(--text-primary);
  border-radius: 2px;
  transition: transform 0.32s cubic-bezier(0.16, 1, 0.3, 1),
              opacity 0.22s ease,
              background-color 0.22s ease;
  transform-origin: center;
}

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

.hero-section {
  padding: 60px 0 60px;
  position: relative;
  text-align: center;
}

.hero-container {
  display: flex;
  flex-direction: column;
  align-items: center;
}

/* Hero Profile Showcase */
.hero-profile-showcase {
  margin-bottom: 28px;
  position: relative;
  display: flex;
  justify-content: center;
}

.hero-avatar-wrapper {
  position: relative;
  width: 144px;
  height: 144px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.avatar-glow-ring {
  position: absolute;
  top: -4px;
  left: -4px;
  right: -4px;
  bottom: -4px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent-blue), var(--accent-purple), var(--accent-green));
  opacity: 0.9;
  filter: blur(2px);
  z-index: 1;
}

.hero-avatar-img {
  position: relative;
  z-index: 2;
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 50%;
  border: 3px solid var(--bg-surface);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.45);
  transition: transform var(--transition-normal);
}

.hero-avatar-wrapper:hover .hero-avatar-img {
  transform: scale(1.03);
}

.avatar-badge {
  position: absolute;
  bottom: -8px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 3;
  background: var(--bg-surface-elevated);
  border: 1px solid var(--bg-card-border);
  padding: 4px 14px;
  border-radius: var(--radius-full);
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--text-primary);
  white-space: nowrap;
  box-shadow: var(--shadow-sm);
  display: flex;
  align-items: center;
  gap: 6px;
}

.status-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--accent-green);
  box-shadow: 0 0 6px var(--accent-green);
}

.hero-status-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--bg-surface-elevated);
  border: 1px solid var(--bg-card-border);
  padding: 6px 16px;
  border-radius: var(--radius-full);
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 24px;
  box-shadow: var(--shadow-sm);
}

.status-indicator {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--accent-green);
  box-shadow: 0 0 8px var(--accent-green);
  animation: pulse-green 2s infinite;
}

@keyframes pulse-green {
  0% { transform: scale(0.95); opacity: 0.8; }
  50% { transform: scale(1.15); opacity: 1; box-shadow: 0 0 12px var(--accent-green); }
  100% { transform: scale(0.95); opacity: 0.8; }
}

.hero-title {
  font-family: var(--font-heading);
  font-size: 3.6rem;
  line-height: 1.12;
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: 20px;
  max-width: 900px;
}

.hero-subtitle {
  font-size: 1.18rem;
  color: var(--text-secondary);
  max-width: 740px;
  line-height: 1.65;
  margin-bottom: 36px;
}

.hero-subtitle strong {
  color: var(--text-primary);
}

.hero-cta-group {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 14px;
  flex-wrap: wrap;
  margin-bottom: 56px;
}

/* Hero Key Metric Bento Tiles */
.hero-bento-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  width: 100%;
  margin-top: 10px;
}

.stat-card {
  padding: 22px 18px;
  text-align: left;
  display: flex;
  flex-direction: column;
}

.stat-icon-wrapper {
  width: 38px;
  height: 38px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 14px;
}

.stat-icon-wrapper.blue { background: rgba(10, 132, 255, 0.15); color: var(--accent-blue); }
.stat-icon-wrapper.purple { background: rgba(191, 90, 242, 0.15); color: var(--accent-purple); }
.stat-icon-wrapper.green { background: rgba(48, 209, 88, 0.15); color: var(--accent-green); }
.stat-icon-wrapper.orange { background: rgba(255, 159, 10, 0.15); color: var(--accent-orange); }

.stat-number {
  font-family: var(--font-heading);
  font-size: 1.7rem;
  font-weight: 800;
  line-height: 1.1;
  color: var(--text-primary);
  letter-spacing: -0.02em;
  margin-bottom: 4px;
}

.stat-label {
  font-size: 0.86rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 2px;
}

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

/* ==========================================================================
   Section Headers & Common Structure
   ========================================================================== */

.section-wrapper {
  padding: 80px 0;
}

.section-header {
  margin-bottom: 44px;
}

.section-header.text-center {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.section-tag {
  display: inline-block;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent-blue);
  margin-bottom: 8px;
}

.section-title {
  font-family: var(--font-heading);
  font-size: 2.3rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  line-height: 1.2;
  margin-bottom: 12px;
}

.section-desc {
  font-size: 1.05rem;
  color: var(--text-secondary);
  max-width: 680px;
  line-height: 1.6;
}

/* ==========================================================================
   Flagship Research & Architecture Visualizer
   ========================================================================== */

.research-showcase {
  padding: 36px;
  background: var(--bg-surface);
}

.arch-visualizer-wrap {
  margin-bottom: 36px;
}

.arch-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 24px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--bg-card-border);
}

.arch-title-group h3 {
  font-family: var(--font-heading);
  font-size: 1.4rem;
  font-weight: 700;
  margin-top: 4px;
}

.arch-tabs {
  display: flex;
  align-items: center;
  gap: 6px;
  background: var(--bg-surface-elevated);
  padding: 4px;
  border-radius: var(--radius-full);
  border: 1px solid var(--bg-card-border);
  overflow-x: auto;
}

.arch-tab-btn {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  font-size: 0.8rem;
  font-weight: 600;
  padding: 6px 14px;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.arch-tab-btn:hover {
  color: var(--text-primary);
}

.arch-tab-btn.active {
  background: var(--accent-blue);
  color: #FFFFFF;
  box-shadow: 0 2px 8px rgba(10, 132, 255, 0.35);
}

/* Architecture Display Grid */
.arch-display-area {
  display: grid;
  grid-template-columns: 1.25fr 0.75fr;
  gap: 24px;
  align-items: center;
}

.arch-image-container {
  background: #08090C;
  border-radius: var(--radius-md);
  padding: 12px;
  border: 1px solid var(--bg-card-border);
  box-shadow: var(--shadow-sm);
  display: flex;
  align-items: center;
  justify-content: center;
}

.arch-svg-img {
  width: 100%;
  height: auto;
  border-radius: var(--radius-sm);
}

.arch-info-panel {
  background: var(--bg-surface-elevated);
  border-radius: var(--radius-md);
  border: 1px solid var(--bg-card-border);
  padding: 24px;
  display: flex;
  flex-direction: column;
}

.panel-badge {
  display: inline-block;
  align-self: flex-start;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--accent-blue);
  background: rgba(10, 132, 255, 0.12);
  padding: 3px 10px;
  border-radius: var(--radius-full);
  margin-bottom: 12px;
}

.arch-info-panel h4 {
  font-family: var(--font-heading);
  font-size: 1.22rem;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--text-primary);
}

.arch-info-panel p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 18px;
}

.panel-details {
  display: flex;
  flex-direction: column;
  gap: 10px;
  border-top: 1px solid var(--bg-card-border);
  padding-top: 14px;
}

.detail-item {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.detail-label {
  font-size: 0.74rem;
  font-weight: 600;
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.detail-val {
  font-size: 0.86rem;
  font-weight: 500;
  color: var(--text-primary);
  font-family: var(--font-mono);
}

/* Benchmarks Grid */
.benchmarks-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  border-top: 1px solid var(--bg-card-border);
  padding-top: 28px;
}

.benchmark-card {
  background: var(--bg-surface-elevated);
  border: 1px solid var(--bg-card-border);
  border-radius: var(--radius-md);
  padding: 22px;
}

.benchmark-card.highlight-card {
  border-color: rgba(48, 209, 88, 0.4);
  background: linear-gradient(180deg, rgba(48, 209, 88, 0.04) 0%, var(--bg-surface-elevated) 100%);
}

.benchmark-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 20px;
}

.dataset-name {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.08rem;
  color: var(--text-primary);
}

.dataset-desc {
  font-size: 0.78rem;
  color: var(--text-secondary);
  margin-top: 2px;
}

.badge-tag {
  font-size: 0.7rem;
  font-weight: 700;
  padding: 3px 8px;
  border-radius: var(--radius-full);
  background: var(--bg-subtle);
  border: 1px solid var(--bg-card-border);
  color: var(--text-secondary);
}

.green-tag {
  background: rgba(48, 209, 88, 0.15);
  color: var(--accent-green);
  border-color: rgba(48, 209, 88, 0.3);
}

.metrics-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-bottom: 16px;
}

.metric-box {
  background: var(--bg-subtle);
  padding: 12px 14px;
  border-radius: var(--radius-sm);
}

.metric-val {
  font-family: var(--font-heading);
  font-size: 1.6rem;
  font-weight: 800;
  line-height: 1.1;
}

.text-blue { color: var(--accent-blue); }
.text-cyan { color: var(--accent-cyan); }
.text-green { color: var(--accent-green); }
.text-purple { color: var(--accent-purple); }

.metric-name {
  font-size: 0.74rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-top: 4px;
  margin-bottom: 8px;
}

.metric-bar-bg {
  width: 100%;
  height: 4px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 2px;
  overflow: hidden;
}

.metric-bar-fill {
  height: 100%;
  border-radius: 2px;
}

.metric-bar-fill.blue { background-color: var(--accent-blue); }
.metric-bar-fill.cyan { background-color: var(--accent-cyan); }
.metric-bar-fill.green { background-color: var(--accent-green); }
.metric-bar-fill.purple { background-color: var(--accent-purple); }

.benchmark-footer {
  font-size: 0.78rem;
  color: var(--text-tertiary);
  font-weight: 500;
}

/* ==========================================================================
   Publications Section
   ========================================================================== */

.publications-list {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.pub-card {
  padding: 30px;
  position: relative;
  overflow: hidden;
}

.pub-type-badge {
  position: absolute;
  top: 24px;
  right: 28px;
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  background: rgba(10, 132, 255, 0.12);
  color: var(--accent-blue);
  border: 1px solid rgba(10, 132, 255, 0.25);
  padding: 4px 12px;
  border-radius: var(--radius-full);
}

.pub-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.82rem;
  color: var(--text-tertiary);
  margin-bottom: 12px;
}

.pub-venue {
  font-weight: 700;
  color: var(--accent-blue);
}

.pub-status-badge {
  background: rgba(48, 209, 88, 0.12);
  color: var(--accent-green);
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 0.72rem;
  font-weight: 700;
}

.meta-dot {
  color: var(--text-tertiary);
}

.pub-title {
  font-family: var(--font-heading);
  font-size: 1.45rem;
  font-weight: 700;
  line-height: 1.35;
  color: var(--text-primary);
  margin-bottom: 10px;
  max-width: 90%;
}

.pub-authors {
  font-size: 0.95rem;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

.author-me {
  font-weight: 700;
  color: var(--text-primary);
  text-decoration: underline;
  text-decoration-color: var(--accent-blue);
  text-underline-offset: 3px;
}

.pub-venue-full {
  font-size: 0.88rem;
  color: var(--text-tertiary);
  margin-bottom: 20px;
}

.pub-abstract {
  background: var(--bg-surface-elevated);
  border-radius: var(--radius-md);
  padding: 18px 20px;
  font-size: 0.9rem;
  line-height: 1.65;
  color: var(--text-secondary);
  border: 1px solid var(--bg-card-border);
  margin-bottom: 20px;
  display: none;
}

.pub-abstract.active {
  display: block;
  animation: fadeIn 0.3s ease-out;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(-4px); }
  to { opacity: 1; transform: translateY(0); }
}

.pub-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

/* ==========================================================================
   Featured Projects
   ========================================================================== */

.project-filters {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 14px;
  flex-wrap: wrap;
}

.filter-btn {
  background: var(--bg-surface-elevated);
  border: 1px solid var(--bg-card-border);
  color: var(--text-secondary);
  padding: 6px 16px;
  border-radius: var(--radius-full);
  font-size: 0.82rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
}

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

.filter-btn.active {
  background: var(--accent-blue);
  color: #FFFFFF;
  border-color: var(--accent-blue);
  box-shadow: 0 2px 10px rgba(10, 132, 255, 0.35);
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.project-card {
  padding: 28px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.project-card-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 18px;
}

.project-icon-badge {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.project-icon-badge.web { background: rgba(100, 210, 255, 0.15); color: var(--accent-cyan); }
.project-icon-badge.blue { background: rgba(10, 132, 255, 0.15); color: var(--accent-blue); }
.project-icon-badge.purple { background: rgba(191, 90, 242, 0.15); color: var(--accent-purple); }
.project-icon-badge.orange { background: rgba(255, 159, 10, 0.15); color: var(--accent-orange); }

.project-status {
  font-size: 0.74rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border-radius: var(--radius-full);
  background: var(--bg-subtle);
  border: 1px solid var(--bg-card-border);
}

.project-status.live {
  background: rgba(48, 209, 88, 0.12);
  color: var(--accent-green);
  border-color: rgba(48, 209, 88, 0.25);
}

.live-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--accent-green);
  animation: pulse-green 1.5s infinite;
}

.project-status.research {
  background: rgba(10, 132, 255, 0.12);
  color: var(--accent-blue);
  border-color: rgba(10, 132, 255, 0.25);
}

.project-title {
  font-family: var(--font-heading);
  font-size: 1.35rem;
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 12px;
  color: var(--text-primary);
}

.project-desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 20px;
  flex-grow: 1;
}

.tech-stack-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 24px;
}

.tech-pill {
  font-size: 0.74rem;
  font-weight: 500;
  padding: 3px 10px;
  border-radius: var(--radius-full);
  background: var(--bg-subtle);
  color: var(--text-secondary);
  border: 1px solid var(--bg-card-border);
}

.project-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-top: 1px solid var(--bg-card-border);
  padding-top: 16px;
}

.project-link {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--accent-blue);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.project-link:hover {
  text-decoration: underline;
}

.project-icon-link {
  color: var(--text-tertiary);
  transition: color var(--transition-fast);
}

.project-icon-link:hover {
  color: var(--text-primary);
}

/* ==========================================================================
   Teaching & Academic Experience
   ========================================================================== */

.teaching-bento {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 24px;
}

.teaching-main-card {
  padding: 32px;
  display: flex;
  flex-direction: column;
}

.inst-badge-row {
  display: flex;
  align-items: flex-start;
  gap: 18px;
  margin-bottom: 20px;
}

.inst-photo-wrap {
  position: relative;
  width: 64px;
  height: 64px;
  flex-shrink: 0;
}

.inst-photo-img {
  width: 64px;
  height: 64px;
  border-radius: 16px;
  object-fit: cover;
  border: 2px solid var(--accent-blue);
  box-shadow: 0 4px 16px rgba(10, 132, 255, 0.35);
}

.inst-photo-badge {
  position: absolute;
  bottom: -6px;
  right: -6px;
  background: var(--accent-blue);
  color: #FFFFFF;
  font-size: 0.62rem;
  font-weight: 800;
  padding: 1px 6px;
  border-radius: var(--radius-full);
  letter-spacing: 0.05em;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.4);
}

.inst-logo-avatar {
  width: 56px;
  height: 56px;
  border-radius: 14px;
  background: linear-gradient(135deg, #0071E3, #30D158);
  color: #FFFFFF;
  font-weight: 800;
  font-size: 1.1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 16px rgba(0, 113, 227, 0.4);
  flex-shrink: 0;
}

.inst-role {
  display: inline-block;
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--accent-blue);
  letter-spacing: 0.05em;
  margin-bottom: 2px;
}

.inst-college {
  font-family: var(--font-heading);
  font-size: 1.4rem;
  font-weight: 700;
  line-height: 1.25;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.inst-dept {
  display: block;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
}

.inst-duration {
  display: block;
  font-size: 0.8rem;
  color: var(--text-tertiary);
  margin-top: 4px;
}

.inst-summary {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.65;
  margin-bottom: 24px;
}

.teaching-highlights {
  display: flex;
  flex-direction: column;
  gap: 16px;
  border-top: 1px solid var(--bg-card-border);
  padding-top: 20px;
}

.highlight-item {
  display: flex;
  align-items: flex-start;
  gap: 14px;
}

.hi-icon {
  font-size: 1.25rem;
  line-height: 1;
  padding: 6px;
  background: var(--bg-subtle);
  border-radius: 8px;
}

.highlight-item strong {
  display: block;
  font-size: 0.92rem;
  color: var(--text-primary);
  margin-bottom: 2px;
}

.highlight-item p {
  font-size: 0.84rem;
  color: var(--text-secondary);
  margin: 0;
}

.teaching-side-cards {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.side-card {
  padding: 24px;
}

.side-card h4 {
  font-family: var(--font-heading);
  font-size: 1.12rem;
  font-weight: 700;
  margin-bottom: 16px;
  color: var(--text-primary);
}

.clean-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
  font-size: 0.86rem;
  color: var(--text-secondary);
}

.clean-list li {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  line-height: 1.5;
}

.clean-list .bullet {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--accent-blue);
  margin-top: 8px;
  flex-shrink: 0;
}

.clean-list strong {
  color: var(--text-primary);
}

.quote-card {
  background: linear-gradient(135deg, rgba(10, 132, 255, 0.08) 0%, rgba(191, 90, 242, 0.08) 100%);
  border-color: rgba(10, 132, 255, 0.2);
}

.quote-mark {
  font-family: Georgia, serif;
  font-size: 2.8rem;
  line-height: 1;
  color: var(--accent-blue);
  opacity: 0.5;
  margin-bottom: -10px;
}

.quote-text {
  font-size: 0.92rem;
  font-style: italic;
  color: var(--text-primary);
  line-height: 1.6;
  margin-bottom: 12px;
}

.quote-author {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--accent-blue);
}

/* ==========================================================================
   Skills Bento Grid
   ========================================================================== */

.skills-bento-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.skill-tile {
  padding: 24px;
  display: flex;
  flex-direction: column;
}

.skill-tile.large-tile {
  grid-column: span 2;
}

.skill-tile-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 18px;
}

.tile-icon {
  font-size: 1.5rem;
}

.skill-tile-header h3 {
  font-family: var(--font-heading);
  font-size: 1.15rem;
  font-weight: 700;
  line-height: 1.2;
  color: var(--text-primary);
}

.tile-subtitle {
  font-size: 0.75rem;
  color: var(--text-tertiary);
}

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

.tag-badge {
  font-size: 0.8rem;
  font-weight: 500;
  padding: 5px 12px;
  border-radius: var(--radius-full);
  background: var(--bg-subtle);
  border: 1px solid var(--bg-card-border);
  color: var(--text-secondary);
  transition: all var(--transition-fast);
}

.tag-badge:hover {
  border-color: var(--accent-blue);
  color: var(--text-primary);
  transform: translateY(-1px);
}

.tag-badge.highlight {
  background: rgba(10, 132, 255, 0.12);
  color: var(--accent-blue);
  border-color: rgba(10, 132, 255, 0.3);
  font-weight: 600;
}

/* ==========================================================================
   Education & Qualifications Timeline
   ========================================================================== */

.timeline-container {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.timeline-card {
  padding: 28px;
  position: relative;
  display: flex;
  gap: 24px;
}

.timeline-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--accent-blue);
  box-shadow: 0 0 10px var(--accent-blue);
  margin-top: 6px;
  flex-shrink: 0;
}

.timeline-time {
  font-family: var(--font-mono);
  font-size: 0.84rem;
  font-weight: 600;
  color: var(--accent-blue);
  min-width: 100px;
  flex-shrink: 0;
  margin-top: 2px;
}

.timeline-body {
  flex-grow: 1;
}

.edu-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 4px;
}

.edu-top h3 {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
}

.grade-badge {
  background: rgba(48, 209, 88, 0.15);
  color: var(--accent-green);
  border: 1px solid rgba(48, 209, 88, 0.3);
  padding: 2px 10px;
  border-radius: var(--radius-full);
  font-size: 0.78rem;
  font-weight: 700;
}

.edu-specialization {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--accent-cyan);
  margin-bottom: 2px;
}

.edu-inst {
  font-size: 0.88rem;
  color: var(--text-secondary);
  font-weight: 500;
  margin-bottom: 12px;
}

.edu-desc {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ==========================================================================
   Contact Section
   ========================================================================== */

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px;
}

.contact-info-cards {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.info-card {
  padding: 20px;
  display: flex;
  align-items: center;
  gap: 16px;
  position: relative;
}

.info-icon {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.info-icon.blue { background: rgba(10, 132, 255, 0.15); color: var(--accent-blue); }
.info-icon.green { background: rgba(48, 209, 88, 0.15); color: var(--accent-green); }
.info-icon.purple { background: rgba(191, 90, 242, 0.15); color: var(--accent-purple); }

.info-details {
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.info-label {
  font-size: 0.74rem;
  font-weight: 600;
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: 2px;
}

.info-val {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-primary);
}

.info-val-block {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

.info-val-block strong {
  color: var(--text-primary);
}

.copy-small-btn {
  background: var(--bg-subtle);
  border: 1px solid var(--bg-card-border);
  color: var(--text-secondary);
  width: 32px;
  height: 32px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.copy-small-btn:hover {
  background: var(--accent-blue);
  color: #FFFFFF;
}

.social-links-card {
  padding: 16px 20px;
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.social-pill-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  border-radius: var(--radius-full);
  background: var(--bg-subtle);
  border: 1px solid var(--bg-card-border);
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--text-primary);
  transition: all var(--transition-fast);
}

.social-pill-btn:hover {
  border-color: var(--accent-blue);
  background: rgba(10, 132, 255, 0.12);
  transform: translateY(-1px);
}

/* Contact Form */
.contact-form-card {
  padding: 32px;
}

.contact-form-card h3 {
  font-family: var(--font-heading);
  font-size: 1.35rem;
  font-weight: 700;
  margin-bottom: 4px;
  color: var(--text-primary);
}

.form-sub {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 24px;
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.form-group label {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.form-group input,
.form-group select,
.form-group textarea {
  background: var(--bg-surface-elevated);
  border: 1px solid var(--bg-card-border);
  border-radius: var(--radius-md);
  padding: 10px 14px;
  color: var(--text-primary);
  font-size: 0.9rem;
  transition: all var(--transition-fast);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--accent-blue);
  box-shadow: 0 0 0 3px rgba(10, 132, 255, 0.2);
}

.form-status {
  margin-top: 14px;
  font-size: 0.86rem;
  font-weight: 500;
  text-align: center;
  min-height: 20px;
}

.form-status.success {
  color: var(--accent-green);
}

/* ==========================================================================
   BibTeX Modal & Toast Notification
   ========================================================================== */

.modal-backdrop {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: rgba(0, 0, 0, 0.75);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  z-index: 2000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-normal), visibility var(--transition-normal);
}

.modal-backdrop.active {
  opacity: 1;
  visibility: visible;
}

.modal-card {
  width: 100%;
  max-width: 620px;
  background: var(--bg-surface);
  border: 1px solid var(--bg-card-border);
  border-radius: var(--radius-lg);
  padding: 28px;
  box-shadow: var(--shadow-lg);
  transform: scale(0.95);
  transition: transform var(--transition-normal);
}

.modal-backdrop.active .modal-card {
  transform: scale(1);
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 20px;
}

.modal-title-group h3 {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 700;
  margin-top: 4px;
}

.modal-close-btn {
  background: transparent;
  border: none;
  font-size: 1.5rem;
  line-height: 1;
  color: var(--text-tertiary);
  cursor: pointer;
  transition: color var(--transition-fast);
}

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

.bibtex-code-block {
  background: #08090C;
  border: 1px solid var(--bg-card-border);
  border-radius: var(--radius-md);
  padding: 16px;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: #64D2FF;
  line-height: 1.6;
  overflow-x: auto;
  margin-bottom: 20px;
}

.modal-footer {
  display: flex;
  justify-content: flex-end;
  gap: 10px;
}

/* ==========================================================================
   Apple-Style Dynamic Toast Notification (Frosted Glass Dynamic Island)
   ========================================================================== */
.toast-notification {
  position: fixed;
  top: 20px;
  left: 50%;
  transform: translateX(-50%) translateY(-35px) scale(0.95);
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.1) 0%, rgba(255, 255, 255, 0.03) 100%),
              rgba(14, 16, 22, 0.45);
  backdrop-filter: blur(28px) saturate(190%);
  -webkit-backdrop-filter: blur(28px) saturate(190%);
  border: 1px solid rgba(255, 255, 255, 0.22);
  border-radius: var(--radius-full);
  padding: 8px 18px;
  display: flex;
  align-items: center;
  gap: 10px;
  box-shadow: 0 16px 36px rgba(0, 0, 0, 0.35),
              inset 0 1px 1px 0 rgba(255, 255, 255, 0.35),
              inset 0 -1px 1px 0 rgba(0, 0, 0, 0.2);
  z-index: 100000;
  opacity: 0;
  visibility: hidden;
  pointer-events: none !important;
  user-select: none;
  transition: opacity 0.32s cubic-bezier(0.16, 1, 0.3, 1),
              transform 0.32s cubic-bezier(0.16, 1, 0.3, 1),
              visibility 0.32s;
}

[data-theme="light"] .toast-notification {
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.75) 0%, rgba(255, 255, 255, 0.45) 100%),
              rgba(255, 255, 255, 0.5);
  border: 1px solid rgba(255, 255, 255, 0.85);
  box-shadow: 0 16px 36px rgba(0, 0, 0, 0.08),
              inset 0 1px 2px 0 rgba(255, 255, 255, 0.9),
              inset 0 -1px 1px 0 rgba(0, 0, 0, 0.04);
}

.toast-notification.active {
  transform: translateX(-50%) translateY(0) scale(1);
  opacity: 1;
  visibility: visible;
  pointer-events: none !important;
}

.toast-notification * {
  pointer-events: none !important;
}

.toast-icon {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent-blue), var(--accent-purple));
  color: #FFFFFF;
  font-size: 0.75rem;
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 2px 10px rgba(10, 132, 255, 0.45), inset 0 1px 1px rgba(255, 255, 255, 0.4);
}

.toast-message {
  font-size: 0.86rem;
  font-weight: 600;
  color: var(--text-primary);
  letter-spacing: -0.01em;
  white-space: nowrap;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.2);
}

[data-theme="light"] .toast-message {
  text-shadow: none;
}

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

.site-footer {
  border-top: 1px solid var(--bg-card-border);
  padding: 50px 0 30px;
  background: var(--bg-surface);
  margin-top: 60px;
}

.footer-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 20px;
  padding-bottom: 30px;
  border-bottom: 1px solid var(--bg-card-border);
}

.footer-logo {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  display: block;
  margin-bottom: 4px;
}

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

.footer-links-group {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
}

.footer-links-group a {
  font-size: 0.86rem;
  color: var(--text-secondary);
}

.footer-links-group a:hover {
  color: var(--text-primary);
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 14px;
  padding-top: 24px;
  font-size: 0.78rem;
  color: var(--text-tertiary);
}

.footer-misc {
  display: flex;
  align-items: center;
  gap: 8px;
}

.back-to-top {
  color: var(--accent-blue);
}

/* ==========================================================================
   Responsive Breakpoints & Mobile Optimization
   ========================================================================== */

@media (max-width: 1024px) {
  .hero-title {
    font-size: 2.8rem;
  }
  .hero-bento-stats {
    grid-template-columns: repeat(2, 1fr);
  }
  .skills-bento-grid {
    grid-template-columns: 1fr;
  }
  .skill-tile.large-tile {
    grid-column: span 1;
  }
  .arch-display-area {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  /* Layout & Spacing */
  .container {
    padding: 0 18px;
  }
  .section-title {
    font-size: 2rem;
  }
  .section-subtitle {
    font-size: 0.95rem;
  }

  /* Navigation & Mobile Drawer */
  .nav-menu {
    display: block;
    position: absolute;
    top: 100%;
    left: 0;
    width: 100%;
    background: rgba(14, 16, 22, 0.95);
    backdrop-filter: blur(28px);
    -webkit-backdrop-filter: blur(28px);
    border-bottom: 1px solid var(--bg-card-border);
    border-radius: 0 0 24px 24px;
    padding: 16px 20px 22px;
    box-shadow: 0 24px 48px rgba(0, 0, 0, 0.45), 0 0 0 1px rgba(255, 255, 255, 0.06);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transform: translateY(-16px) scale(0.98);
    transform-origin: top center;
    transition: opacity 0.32s cubic-bezier(0.16, 1, 0.3, 1),
                transform 0.32s cubic-bezier(0.16, 1, 0.3, 1),
                visibility 0.32s,
                box-shadow 0.32s;
  }

  [data-theme="light"] .nav-menu {
    background: rgba(255, 255, 255, 0.96);
    box-shadow: 0 24px 48px rgba(0, 0, 0, 0.12), 0 0 0 1px rgba(0, 0, 0, 0.06);
  }

  .nav-menu.mobile-open {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transform: translateY(0) scale(1);
  }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 6px;
  }

  .nav-link {
    display: flex;
    align-items: center;
    padding: 12px 16px;
    border-radius: 12px;
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-secondary);
    opacity: 0;
    transform: translateX(-12px);
    transition: opacity 0.28s cubic-bezier(0.16, 1, 0.3, 1),
                transform 0.28s cubic-bezier(0.16, 1, 0.3, 1),
                background-color 0.2s,
                color 0.2s;
  }

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

  /* Staggered cascading reveal on open */
  .nav-menu.mobile-open .nav-list li:nth-child(1) .nav-link { transition-delay: 0.04s; }
  .nav-menu.mobile-open .nav-list li:nth-child(2) .nav-link { transition-delay: 0.08s; }
  .nav-menu.mobile-open .nav-list li:nth-child(3) .nav-link { transition-delay: 0.12s; }
  .nav-menu.mobile-open .nav-list li:nth-child(4) .nav-link { transition-delay: 0.16s; }
  .nav-menu.mobile-open .nav-list li:nth-child(5) .nav-link { transition-delay: 0.20s; }
  .nav-menu.mobile-open .nav-list li:nth-child(6) .nav-link { transition-delay: 0.24s; }

  .nav-link:hover, .nav-link.active {
    background: rgba(10, 132, 255, 0.12);
    color: var(--accent-blue);
  }

  .mobile-toggle {
    display: flex;
  }

  .mobile-toggle.active .bar:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
  }
  .mobile-toggle.active .bar:nth-child(2) {
    opacity: 0;
    transform: scaleX(0);
  }
  .mobile-toggle.active .bar:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
  }

  .download-cv-btn {
    display: none;
  }

  /* Hero Section Mobile */
  .hero-section {
    padding: 40px 0 50px;
  }
  .hero-title {
    font-size: 2.2rem;
    line-height: 1.15;
  }
  .hero-subtitle {
    font-size: 0.98rem;
    line-height: 1.5;
  }
  .hero-cta-group {
    flex-direction: column;
    width: 100%;
    max-width: 320px;
    gap: 12px;
  }
  .hero-cta-group .btn {
    width: 100%;
    justify-content: center;
  }
  .hero-bento-stats {
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
  }

  /* Grids & Cards */
  .projects-grid,
  .teaching-bento,
  .benchmarks-grid,
  .contact-grid {
    grid-template-columns: 1fr;
  }
  .form-row {
    grid-template-columns: 1fr;
  }
  .timeline-card {
    flex-direction: column;
    gap: 10px;
  }
  .timeline-time {
    min-width: unset;
  }

  /* Research Tabs */
  .arch-nav-tabs {
    flex-wrap: nowrap;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    padding-bottom: 8px;
    justify-content: flex-start;
  }
  .arch-tab-btn {
    white-space: nowrap;
    flex-shrink: 0;
  }

  /* Publication Cards */
  .pub-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
  }
  .pub-actions {
    flex-direction: column;
    width: 100%;
  }
  .pub-actions .btn {
    width: 100%;
    justify-content: center;
  }

  /* Floating Button */
  .floating-top-btn {
    bottom: calc(20px + env(safe-area-inset-bottom, 0px));
    right: 20px;
    padding: 8px 14px;
    font-size: 0.8rem;
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 1.85rem;
  }
  .hero-avatar-wrapper {
    width: 136px;
    height: 136px;
  }
  .avatar-status-badge {
    font-size: 0.65rem;
    padding: 4px 10px;
    max-width: 90%;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
  }
  .hero-bento-stats {
    grid-template-columns: 1fr;
  }
  .project-filter-tabs {
    flex-wrap: nowrap;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    padding-bottom: 6px;
  }
  .filter-tab-btn {
    white-space: nowrap;
    flex-shrink: 0;
  }
  .input-control, select, textarea {
    font-size: 16px; /* Prevents auto-zoom in iOS Safari */
  }
  .modal-card {
    width: 94%;
    padding: 20px 16px;
  }
}

@keyframes slideDownNav {
  from {
    opacity: 0;
    transform: translateY(-8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ==========================================================================
   Floating Back to Top Button
   ========================================================================== */
.floating-top-btn {
  position: fixed;
  bottom: 30px;
  right: 30px;
  padding: 10px 16px;
  height: 42px;
  border-radius: 9999px;
  background: rgba(18, 18, 24, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid rgba(255, 255, 255, 0.18);
  color: #FFFFFF;
  font-family: var(--font-sans);
  font-size: 0.85rem;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  cursor: pointer;
  z-index: 99999;
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.35), 0 0 0 1px rgba(255, 255, 255, 0.08);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transform: translateY(20px) scale(0.92);
  transition: opacity 0.3s cubic-bezier(0.16, 1, 0.3, 1),
              transform 0.3s cubic-bezier(0.16, 1, 0.3, 1),
              visibility 0.3s,
              background 0.2s,
              box-shadow 0.2s;
}

[data-theme="light"] .floating-top-btn {
  background: rgba(255, 255, 255, 0.9);
  border-color: rgba(0, 0, 0, 0.12);
  color: #1D1D1F;
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.12), 0 0 0 1px rgba(0, 0, 0, 0.06);
}

.floating-top-btn.visible {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transform: translateY(0) scale(1);
}

.floating-top-btn:hover {
  background: var(--accent-blue);
  color: #FFFFFF;
  border-color: var(--accent-blue);
  box-shadow: 0 10px 30px rgba(10, 132, 255, 0.5);
  transform: translateY(-3px) scale(1.05);
}

.floating-top-btn:active {
  transform: translateY(0) scale(0.96);
}

.floating-top-btn svg {
  transition: transform 0.25s ease;
}

.floating-top-btn:hover svg {
  transform: translateY(-2px);
}