/* ==========================================================================
   1. Global Styles & Variables - Apple Design System
   ========================================================================== */
:root {
  /* Apple Color Palette */
  --primary: #000000;
  --primary-hover: #0056CC;
  --accent: #FF3B30;
  --success: #34C759;
  --warning: #FF9500;
  
  /* Neutral Colors */
  --white: #FFFFFF;
  --gray-1: #F2F2F7;
  --gray-2: #E5E5EA;
  --gray-3: #D1D1D6;
  --gray-4: #C7C7CC;
  --gray-5: #AEAEB2;
  --gray-6: #8E8E93;
  --black: #000000;
  
  /* Semantic Colors */
  --text-primary: #000000;
  --text-secondary: #3C3C43;
  --text-tertiary: #8E8E93;
  --background: #FFFFFF;
  --surface: rgba(255, 255, 255, 0.8);
  --border-color: #E5E5EA;
  
  /* Typography Scale */
  --font-size-xs: 0.75rem;    /* 12px */
  --font-size-sm: 0.875rem;   /* 14px */
  --font-size-base: 1rem;     /* 16px */
  --font-size-lg: 1.125rem;   /* 18px */
  --font-size-xl: 1.25rem;    /* 20px */
  --font-size-2xl: 1.5rem;    /* 24px */
  --font-size-3xl: 1.875rem;  /* 30px */
  --font-size-4xl: 2.25rem;   /* 36px */
  
  /* Spacing Scale */
  --space-1: 0.25rem;   /* 4px */
  --space-2: 0.5rem;    /* 8px */
  --space-3: 0.75rem;   /* 12px */
  --space-4: 1rem;      /* 16px */
  --space-5: 1.25rem;   /* 20px */
  --space-6: 1.5rem;    /* 24px */
  --space-8: 2rem;      /* 32px */
  --space-10: 2.5rem;   /* 40px */
  --space-12: 3rem;     /* 48px */
  --space-16: 4rem;     /* 64px */
  
  /* Border Radius - Apple Design System */
  --border-radius-sm: 6px;
  --border-radius: 12px;
  --border-radius-md: 16px;
  --border-radius-lg: 20px;
  --border-radius-xl: 24px;
  --border-radius-2xl: 28px;
  --border-radius-full: 9999px;
  --border-radius-pill: 50px;
  
  /* Shadows */
  --shadow-xs: 0 1px 3px rgba(0, 0, 0, 0.05);
  --shadow-sm: 0 4px 6px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 10px 15px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 20px 25px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 25px 50px rgba(0, 0, 0, 0.15);
  
  /* Layout */
  --content-width: 960px;
  --sidebar-width: 280px;
  --sidebar-gap: var(--space-8);
  --header-height: var(--space-16);
  
  /* Transitions */
  --transition-fast: 0.15s;
  --transition-base: 0.2s;
  --transition-slow: 0.3s;
  --easing-apple: cubic-bezier(0.4, 0, 0.2, 1);
  --easing-bounce: cubic-bezier(0.68, -0.55, 0.265, 1.55);
  
  /* Unified Animation Values */
  --hover-scale-subtle: 1.02;
  --hover-scale-medium: 1.05;
  --hover-scale-bold: 1.1;
  --hover-translate-subtle: 2px;
  --hover-translate-medium: 4px;
  --hover-rotate-subtle: 2deg; /* Reserved for functional elements like chevrons */
  --hover-rotate-medium: 5deg; /* Reserved for functional elements like chevrons */
  --press-scale: 0.95;
  --bounce-scale: 1.05;
  
  /* Animation Durations */
  --anim-fast: 0.3s;
  --anim-base: 0.5s;
  --anim-slow: 0.8s;
  --anim-extra-slow: 1.2s;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Text', 'Helvetica Neue', Helvetica, Arial, sans-serif;
  margin: 0;
  padding: 0;
  background: var(--gray-1);
  color: var(--text-primary);
  line-height: 1.6;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  font-size: var(--font-size-base);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: all var(--transition-base) var(--easing-apple);
}

/* Smooth scrolling */
html {
  scroll-behavior: smooth;
}

/* Add smooth transitions to all elements */
*,
*::before,
*::after {
  transition: color var(--transition-base) var(--easing-apple),
              background-color var(--transition-base) var(--easing-apple),
              border-color var(--transition-base) var(--easing-apple),
              box-shadow var(--transition-base) var(--easing-apple),
              opacity var(--transition-base) var(--easing-apple),
              transform var(--transition-base) var(--easing-apple);
}

/* Enhanced transitions for interactive elements */
a, button, .nav-toggle, .sidebar-toggle, .card, .tag, .scroll-to-top, .social-link {
  transition: all var(--transition-base) var(--easing-apple);
  transform: translateZ(0); /* Hardware acceleration */
  will-change: auto; /* Reduce unnecessary repaints */
}

/* Smooth hover effects */
a:hover, button:hover, .nav-toggle:hover, .sidebar-toggle:hover, .card:hover, .tag:hover, .scroll-to-top:hover, .social-link:hover {
  transition: all var(--transition-fast) var(--easing-apple);
}

/* Focus states with smooth transitions */
a:focus, button:focus, .nav-toggle:focus, .sidebar-toggle:focus, input:focus, select:focus, textarea:focus {
  transition: all var(--transition-fast) var(--easing-apple);
  outline: 2px solid var(--blue-6);
  outline-offset: 2px;
}

/* Layout transitions - reduced for performance */
.container, .main-content, .sidebar, .page-header, .navigation, .mobile-nav-container, .sidebar-container {
  transition: opacity var(--transition-fast) var(--easing-apple);
}

p {
  text-align: justify;
  hyphens: auto;
  margin-bottom: var(--space-4);
  line-height: 1.6;
  transition: all var(--transition-slow) var(--easing-apple);
  /* Removed entrance animation for faster loading */
  opacity: 1;
}

/* Removed stagger animations for faster page loads */

/* ==========================================================================
   2. Main Layout - Apple Design System
   ========================================================================== */
.container {
  width: 100%;
  max-width: var(--content-width);
  margin: var(--space-16) auto;
  padding: 0 var(--space-8);
  box-sizing: border-box;
  /* Removed entrance animation for faster loading */
}

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

@keyframes fadeInLeft {
  from {
    opacity: 0;
    transform: translateX(-30px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes fadeInRight {
  from {
    opacity: 0;
    transform: translateX(30px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes scaleIn {
  from {
    opacity: 0;
    transform: scale(var(--press-scale));
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

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

@keyframes bounceIn {
  0% {
    opacity: 0;
    transform: scale(0.3);
  }
  50% {
    opacity: 1;
    transform: scale(var(--bounce-scale));
  }
  70% {
    transform: scale(0.9);
  }
  100% {
    opacity: 1;
    transform: scale(1);
  }
}

@keyframes gentleBounce {
  0% {
    transform: translateY(0) scale(1);
  }
  50% {
    transform: translateY(-var(--hover-translate-subtle)) scale(var(--hover-scale-subtle));
  }
  100% {
    transform: translateY(-var(--hover-translate-subtle)) scale(1);
  }
}

@keyframes ripple {
  0% {
    transform: translate(-50%, -50%) scale(0);
    opacity: 0.8;
  }
  100% {
    transform: translate(-50%, -50%) scale(4);
    opacity: 0;
  }
}

@keyframes slideUpFadeOut {
  from {
    opacity: 1;
    transform: translateY(0);
    max-height: 2000px;
  }
  to {
    opacity: 0;
    transform: translateY(-10px);
    max-height: 0;
  }
}

@keyframes slideDownFadeIn {
  from {
    opacity: 0;
    transform: translateY(-10px);
    max-height: 0;
  }
  to {
    opacity: 1;
    transform: translateY(0);
    max-height: 2000px;
  }
}

@keyframes slideInLeft {
  from {
    opacity: 0;
    transform: translateX(-20px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

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

@keyframes float {
  0%, 100% {
    transform: translateY(0px);
  }
  50% {
    transform: translateY(-3px);
  }
}

@keyframes glow {
  0%, 100% {
    box-shadow: var(--shadow-sm);
  }
  50% {
    box-shadow: var(--shadow-md);
  }
}

/* Removed all stagger animations for faster page loads */

main {
  flex-grow: 1;
}

/* ==========================================================================
   3. Header & Navigation - Apple Design System
   ========================================================================== */
.page-header {
  display: flex;
  justify-content: flex-end;
  align-items: center;
  margin-bottom: var(--space-6);
  animation: fadeInUp 0.5s var(--easing-apple) forwards;
  animation-delay: 0.1s;
  opacity: 0;
}

.page-header nav {
  background: var(--surface);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-xl);
  box-shadow: var(--shadow-sm);
  padding: var(--space-4) var(--space-6);
  width: 100%;
  box-sizing: border-box;
  backdrop-filter: blur(10px);
  transition: all var(--transition-slow) var(--easing-apple);
  transform: translateY(0);
  animation: float 4s ease-in-out infinite;
}

.page-header nav:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
  animation-play-state: paused;
}

/* Navigation Header (Mobile) */
.nav-header {
  display: none;
  justify-content: center;
  align-items: center;
  padding-bottom: var(--space-4);
  margin-bottom: var(--space-4);
  width: 100%;
  position: relative;
}

.nav-title {
  font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Display', sans-serif;
  font-weight: 600;
  font-size: var(--font-size-lg);
  color: var(--text-primary);
  letter-spacing: -0.01em;
  text-transform: uppercase;
  text-align: center;
}

.nav-toggle {
  background: transparent;
  border: 1.5px solid var(--border-color);
  cursor: pointer;
  color: var(--text-primary);
  font-size: var(--font-size-sm);
  font-weight: 500;
  transition: all var(--transition-base) var(--easing-apple);
  padding: var(--space-3) var(--space-4);
  border-radius: var(--border-radius-full);
  min-width: 44px;
  min-height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  position: absolute;
  right: 0;
  overflow: hidden;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.nav-toggle::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  background: var(--primary);
  border-radius: 50%;
  opacity: 0.2;
  transform: translate(-50%, -50%);
  transition: all var(--transition-base) var(--easing-apple);
}

.nav-toggle:hover {
  background: var(--primary) !important;
  color: var(--white) !important;
  border-color: var(--primary) !important;
  transform: translateY(-var(--hover-translate-subtle)) scale(var(--hover-scale-subtle)) !important;
  box-shadow: 
    0 4px 16px rgba(0, 122, 255, 0.25),
    0 2px 8px rgba(0, 122, 255, 0.15) !important;
}

.nav-toggle:hover::before {
  width: 100%;
  height: 100%;
}

.nav-toggle:active {
  transform: scale(var(--press-scale));
}

.nav-toggle.expanded {
  background: var(--primary);
  color: var(--white);
  border-color: var(--primary);
  transform: rotate(180deg);
  box-shadow: 
    0 4px 16px rgba(0, 122, 255, 0.25),
    0 2px 8px rgba(0, 122, 255, 0.15);
}

.nav-toggle i {
  transition: transform var(--transition-slow) var(--easing-apple);
  z-index: 1;
  position: relative;
}

.nav-toggle.expanded i {
  transform: rotate(180deg);
}

.nav-links-group {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  list-style: none;
  margin: 0;
  padding: 0;
  justify-content: flex-end;
}

.nav-links-group a {
  color: var(--text-secondary);
  text-decoration: none;
  font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Text', sans-serif;
  font-weight: 500;
  font-size: var(--font-size-base);
  padding: var(--space-3) var(--space-4);
  border-radius: var(--border-radius-pill);
  transition: all var(--transition-base) var(--easing-apple);
  position: relative;
  letter-spacing: -0.01em;
  /* Removed entrance animation for faster loading */
  opacity: 1;
}

.nav-links-group a:hover {
  color: var(--text-primary);
  background: var(--gray-1);
  transform: translateY(-var(--hover-translate-subtle)) scale(var(--hover-scale-subtle));
  box-shadow: var(--shadow-xs);
}

.nav-links-group a.active {
  color: var(--primary);
  background: rgba(0, 122, 255, 0.1);
  transform: translateY(-1px);
  box-shadow: var(--shadow-xs);
}

.nav-links-group a.active::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 50%;
  transform: translateX(-50%);
  width: 4px;
  height: 4px;
  background: var(--primary);
  border-radius: 50%;
  animation: scaleIn 0.3s var(--easing-apple) forwards;
}

/* ==========================================================================
   4. Typography & Headings - Apple Design System
   ========================================================================== */
section h2 {
  color: var(--primary);
  font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Display', sans-serif;
  font-size: var(--font-size-3xl);
  font-weight: 700;
  margin-top: var(--space-8);
  margin-bottom: var(--space-6);
  padding-bottom: var(--space-4);
  border-bottom: 1px solid var(--border-color);
  letter-spacing: -0.02em;
  line-height: 1.2;
  transition: all var(--transition-slow) var(--easing-apple);
  animation: fadeInUp 0.8s var(--easing-apple) forwards;
  animation-delay: 0.2s;
  opacity: 0;
}

/* Only make section titles with links interactive */
section h2 > a:hover {
  color: var(--primary-hover);
  transform: translateX(var(--hover-translate-medium)) scale(var(--hover-scale-subtle));
}

section h3 {
  font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Display', sans-serif;
  font-size: var(--font-size-xl);
  font-weight: 600;
  color: var(--primary);
  margin-top: var(--space-6);
  margin-bottom: var(--space-3);
  letter-spacing: -0.01em;
  line-height: 1.3;
  transition: all var(--transition-base) var(--easing-apple);
  animation: fadeInUp 0.6s var(--easing-apple) forwards;
  animation-delay: 0.3s;
  opacity: 0;
}

/* Only make section h3 with links interactive */
section h3 > a:hover {
  color: var(--primary-hover);
  transform: translateX(var(--hover-translate-subtle)) scale(var(--hover-scale-subtle));
}

article h3 {
  font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Display', sans-serif;
  font-size: var(--font-size-lg);
  font-weight: 600;
  color: var(--text-primary);
  margin-top: var(--space-5);
  margin-bottom: var(--space-2);
  letter-spacing: -0.01em;
  line-height: 1.3;
  transition: all var(--transition-base) var(--easing-apple);
  animation: fadeInUp 0.5s var(--easing-apple) forwards;
  animation-delay: 0.4s;
  opacity: 0;
}

/* Only make article h3 with links interactive */
article h3 > a:hover {
  color: var(--primary);
  transform: translateX(var(--hover-translate-subtle)) scale(var(--hover-scale-subtle));
}

.entry-details {
  font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Text', sans-serif;
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  margin-top: var(--space-1);
  margin-bottom: var(--space-1);
  line-height: 1.4;
}

/* ==========================================================================
   5. Main Content & Components - Apple Design System
   ========================================================================== */
.main-content > section {
  background: var(--surface);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-xl);
  box-shadow: var(--shadow-sm);
  padding: var(--space-8);
  margin-bottom: var(--space-6);
  backdrop-filter: blur(10px);
  transition: all var(--transition-slow) var(--easing-apple);
  animation: fadeInUp 0.8s var(--easing-apple) forwards;
  opacity: 0;
}

.main-content > section:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.main-content > section:last-child {
  margin-bottom: 0;
}

.main-content > section > h2 {
  margin-top: 0;
}

article + article {
  border-top: 1px solid var(--border-color);
  margin-top: var(--space-6);
  padding-top: var(--space-6);
}

@keyframes highlight-fade {
  from {
    background-color: rgba(0, 122, 255, 0.1);
  }
  to {
    background-color: transparent;
  }
}

.highlight {
  animation: highlight-fade 2.5s var(--easing-apple);
  border-radius: var(--border-radius);
}

.article-body {
  display: flex;
  align-items: flex-start;
  margin-top: var(--space-4);
  gap: var(--space-4);
}

.institution-logos-container {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  flex: 0 0 70px;
}

.institution-logo {
  flex: 0 0 70px;
  width: 70px;
  height: 70px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--surface);
  border-radius: var(--border-radius);
  padding: var(--space-2);
  box-shadow: var(--shadow-xs);
}

.institution-logo a {
  display: block;
  transition: all 0.3s var(--timing-function);
  border-radius: var(--border-radius-sm);
  text-decoration: none;
}

.institution-logo a:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

.institution-logo a:focus {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}

.institution-logo img {
  max-width: 100%;
  height: auto;
  display: block;
  border-radius: var(--border-radius-sm);
}

.description-content {
  flex: 1;
}

.description-content > *:first-child {
  margin-top: 0;
}

.toggle-arrow {
  display: inline-flex;
  align-items: center;
  cursor: pointer;
  margin-top: var(--space-4);
  margin-bottom: var(--space-3);
  color: var(--text-secondary);
  font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Text', sans-serif;
  font-size: var(--font-size-sm);
  font-weight: 500;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--border-radius-pill);
  transition: all var(--transition-base) var(--easing-apple);
  background: transparent;
  border: 2px solid var(--border-color);
  animation: fadeInUp 0.5s var(--easing-apple) forwards;
  opacity: 0;
}

.toggle-arrow:hover {
  background: var(--text-secondary);
  color: var(--white);
  border-color: var(--text-secondary);
  transform: translateY(-var(--hover-translate-subtle)) scale(var(--hover-scale-subtle));
  box-shadow: var(--shadow-xs);
}

.toggle-arrow::before {
  content: '';
  display: inline-block;
  width: 6px;
  height: 6px;
  border-right: 2px solid currentColor;
  border-bottom: 2px solid currentColor;
  transform: rotate(-45deg);
  margin-right: var(--space-2);
  transition: transform var(--transition-slow) var(--easing-apple);
}

.toggle-arrow[aria-expanded="true"]::before {
  transform: rotate(45deg);
}

.toggle-arrow[aria-expanded="true"] {
  background: var(--primary);
  color: var(--white);
  border-color: var(--primary);
}

.extra-description {
  padding-top: var(--space-4);
  margin-top: var(--space-4);
  border-top: 1px solid var(--border-color);
}

.tag-container {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-top: var(--space-4);
}

.tag {
  display: inline-flex;
  align-items: center;
  background: var(--gray-1);
  color: var(--text-secondary);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--border-radius-pill);
  font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Text', sans-serif;
  font-size: var(--font-size-sm);
  font-weight: 500;
  border: 1px solid var(--border-color-subtle);
  transition: all var(--transition-base) var(--easing-apple);
  white-space: nowrap;
  /* Removed entrance animation for faster loading */
  opacity: 1;
  transform: scale(1);
}

.tag:hover {
  background: var(--primary);
  color: var(--white);
  border-color: var(--primary);
  transform: translateY(-var(--hover-translate-subtle)) scale(var(--hover-scale-subtle));
  box-shadow: var(--shadow-xs);
}

/* ==========================================================================
   6. Sidebar Layout & Components - Apple Design System
   ========================================================================== */
.sidebar {
  background: var(--surface);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-xl);
  box-shadow: var(--shadow-sm);
  padding: var(--space-6);
  backdrop-filter: blur(10px);
  transition: all var(--transition-slow) var(--easing-apple);
  animation: fadeInLeft 0.8s var(--easing-apple) forwards, glow 6s ease-in-out infinite;
  animation-delay: 0.2s, 2s;
  opacity: 0;
}

.sidebar:hover {
  box-shadow: var(--shadow-md);
  animation-play-state: running, paused;
}

/* --- Grid Layout for Pages with Sidebar --- */
body.has-sidebar .container {
  display: grid;
  grid-template-columns: var(--sidebar-width) 1fr;
  grid-template-rows: auto 1fr;
  gap: 0 var(--sidebar-gap);
  max-width: calc(var(--content-width) + var(--sidebar-width) + var(--sidebar-gap));
  align-items: start;
}

body.has-sidebar .page-header {
  grid-column: 2;
  grid-row: 1;
  margin-bottom: 0;
  display: block;
}

body.has-sidebar .sidebar {
  grid-column: 1;
  grid-row: 1 / span 2;
  position: sticky;
  top: var(--space-8);
  margin-bottom: var(--space-8);
}

body.has-sidebar main {
  grid-column: 2;
  grid-row: 2;
  padding-top: var(--space-6);
  padding-bottom: var(--space-8);
}

body.has-sidebar footer {
  grid-column: 1 / -1;
  grid-row: 3;
}

/* --- Nav Bar Apple-style --- */
body.has-sidebar .page-header nav {
  padding: 0;
  overflow: hidden;
  background: var(--surface);
  border-radius: var(--border-radius-xl);
  box-shadow: var(--shadow-xs);
}

body.has-sidebar .nav-links-group {
  justify-content: space-around;
  gap: 0;
}

body.has-sidebar .nav-links-group a {
  flex-grow: 1;
  text-align: center;
  padding: var(--space-4) var(--space-6);
  border-radius: 0;
  font-weight: 500;
  transition: all var(--transition-base) var(--easing-apple);
}

body.has-sidebar .nav-links-group a + a {
  border-left: 1px solid var(--border-color);
}

body.has-sidebar .nav-links-group a:hover {
  background: var(--gray-1);
}

body.has-sidebar .nav-links-group a.active {
  background: var(--primary);
  color: var(--white);
}

/* --- Shared Sidebar Components --- */
.sidebar .profile-image {
  display: block;
  width: 80%;
  margin: 0 auto var(--space-6);
  border-radius: var(--border-radius-xl);
  box-shadow: var(--shadow-xs);
  transition: all var(--transition-slow) var(--easing-apple);
  /* Removed entrance animation for faster loading */
  opacity: 1;
}

.sidebar .profile-image:hover {
  transform: scale(var(--hover-scale-medium));
  box-shadow: var(--shadow-md);
}

/* Sidebar Header (Mobile) */
.sidebar-header {
  display: none;
  justify-content: center;
  align-items: center;
  /* padding-bottom: var(--space-4); */
  margin-bottom: var(--space-4);
  width: 100%;
  position: relative;
}

.sidebar-title {
  font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Display', sans-serif;
  font-weight: 600;
  font-size: var(--font-size-lg);
  color: var(--text-primary);
  letter-spacing: -0.01em;
  text-transform: uppercase;
  text-align: center;
}

.sidebar-toggle {
  background: transparent;
  border: 1.5px solid var(--border-color);
  cursor: pointer;
  color: var(--text-primary);
  font-size: var(--font-size-sm);
  font-weight: 500;
  transition: all var(--transition-base) var(--easing-apple);
  padding: var(--space-3) var(--space-4);
  border-radius: var(--border-radius-full);
  min-width: 44px;
  min-height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  position: absolute;
  right: 0;
  overflow: hidden;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.sidebar-toggle::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  background: var(--primary);
  border-radius: 50%;
  opacity: 0.2;
  transform: translate(-50%, -50%);
  transition: all var(--transition-base) var(--easing-apple);
}

.sidebar-toggle:hover {
  background: var(--primary) !important;
  color: var(--white) !important;
  border-color: var(--primary) !important;
  transform: translateY(-var(--hover-translate-subtle)) scale(var(--hover-scale-subtle)) !important;
  box-shadow: 
    0 4px 16px rgba(0, 122, 255, 0.25),
    0 2px 8px rgba(0, 122, 255, 0.15) !important;
}

.sidebar-toggle:hover::before {
  width: 100%;
  height: 100%;
}

.sidebar-toggle:active {
  transform: scale(var(--press-scale));
}

.sidebar-toggle.expanded {
  background: var(--primary);
  color: var(--white);
  border-color: var(--primary);
  transform: rotate(180deg);
  box-shadow: 
    0 4px 16px rgba(0, 122, 255, 0.25),
    0 2px 8px rgba(0, 122, 255, 0.15);
}

.sidebar-toggle i {
  transition: transform var(--transition-slow) var(--easing-apple);
  z-index: 1;
  position: relative;
}

.sidebar-toggle.expanded i {
  transform: rotate(180deg);
}

.sidebar h3 {
  margin-top: 0;
  color: var(--text-primary);
  font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Display', sans-serif;
  font-weight: 600;
  font-size: var(--font-size-lg);
  border-bottom: 1px solid var(--border-color);
  padding-bottom: var(--space-3);
  margin-bottom: var(--space-4);
  letter-spacing: -0.01em;
}

.sidebar .social-links {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.sidebar .social-links li {
  margin-bottom: 0;
}

.sidebar .social-links a {
  display: flex;
  align-items: center;
  font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Text', sans-serif;
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--text-primary);
  text-decoration: none;
  transition: all var(--transition-base) var(--easing-apple);
  padding: var(--space-4) var(--space-5);
  border-radius: var(--border-radius-pill);
  background: transparent;
  border: 1.5px solid var(--border-color);
  animation: fadeInRight 0.6s var(--easing-apple) forwards;
  opacity: 0;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.sidebar .social-links a:hover {
  color: var(--white);
  background: var(--primary);
  border-color: var(--primary);
  transform: translateY(-var(--hover-translate-subtle)) scale(var(--hover-scale-subtle));
  box-shadow: 
    0 4px 16px rgba(0, 122, 255, 0.25),
    0 2px 8px rgba(0, 122, 255, 0.15);
}

.sidebar .social-links a i {
  font-size: var(--font-size-lg);
  width: 24px;
  text-align: center;
  margin-right: var(--space-3);
  color: var(--primary);
  transition: all var(--transition-base) var(--easing-apple);
}

.sidebar .social-links a:hover i {
  color: var(--white);
}

/* --- Divider and TOC for CV Page --- */
.sidebar-divider {
  border: 0;
  border-top: 1px solid var(--border-color);
  margin: var(--space-6) 0;
}

#toc-nav {
  list-style-type: none;
  padding-left: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

#toc-nav li a {
  text-decoration: none;
  color: var(--text-secondary);
  font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Text', sans-serif;
  font-size: var(--font-size-sm);
  font-weight: 500;
  display: block;
  padding: var(--space-3) var(--space-4);
  border-radius: var(--border-radius-pill);
  transition: all var(--transition-base) var(--easing-apple);
  background: var(--gray-1);
  border: 1px solid var(--border-color);
  text-align: center;
}

#toc-nav li a:hover,
#toc-nav li a:focus {
  color: var(--text-primary);
  background: var(--gray-2);
  transform: translateY(-1px);
  box-shadow: var(--shadow-xs);
}

#toc-nav li a.active {
  background: var(--primary);
  color: var(--white);
  border-color: var(--primary);
}

.tag-container .tag {
  background: var(--gray-1);
  color: var(--text-secondary);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--border-radius-pill);
  font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Text', sans-serif;
  font-size: var(--font-size-xs);
  font-weight: 500;
  white-space: nowrap;
  border: 1px solid var(--border-color);
  transition: all var(--transition-base) var(--easing-apple);
}

.related-links {
  margin-top: var(--space-4);
  font-size: var(--font-size-sm);
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
}

.related-links a {
  color: var(--primary);
  text-decoration: none;
  font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Text', sans-serif;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  padding: var(--space-3) var(--space-4);
  border-radius: var(--border-radius-pill);
  background: transparent;
  border: 1.5px solid var(--primary);
  transition: all var(--transition-base) var(--easing-apple);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.related-links a:hover {
  color: var(--white);
  background: var(--primary);
  border-color: var(--primary);
  transform: translateY(-var(--hover-translate-subtle)) scale(var(--hover-scale-subtle));
  box-shadow: 
    0 4px 16px rgba(0, 122, 255, 0.25),
    0 2px 8px rgba(0, 122, 255, 0.15);
}

.related-links a i {
  margin-right: var(--space-2);
  width: 20px;
  text-align: center;
  color: var(--primary);
  font-size: var(--font-size-lg);
  transition: all var(--transition-base) var(--easing-apple);
}

.related-links a:hover i {
  color: var(--white);
}

/* --- Icon links for titles and institutions --- */
h2 > a, h3 > a, .entry-details > a {
  text-decoration: none;
  color: inherit;
  transition: color var(--transition-base) var(--easing-apple);
  cursor: pointer;
}

h2 > a:hover, h3 > a:hover, .entry-details > a:hover {
  color: var(--primary);
}

h2 > a i, h3 > a i, .entry-details > a i {
  margin-left: var(--space-2);
  font-size: var(--font-size-base);
  color: var(--primary);
  transition: all var(--transition-base) var(--easing-apple);
  opacity: 0.8;
}

h2 > a:hover i, h3 > a:hover i, .entry-details > a:hover i {
  color: var(--primary-hover);
  opacity: 1;
}

/* ==========================================================================
   7. Responsive Design - Apple Design System
   ========================================================================== */

@media (max-width: 1350px) {
  /* Revert to a simple block layout on smaller screens */
  body.has-sidebar .container {
    display: block;
  }

  body.has-sidebar .page-header {
    display: flex;
    justify-content: flex-end;
  }

  body.has-sidebar main {
    padding-top: 0;
  }

  /* Reset sidebar positioning for medium screens */
  .sidebar {
    position: static !important;
    transform: none;
    width: auto;
    height: auto;
    z-index: auto;
    overflow-y: visible;
    margin-bottom: var(--space-6);
  }

  /* Revert nav tabs back to normal links */
  body.has-sidebar .page-header nav {
    padding: var(--space-4) var(--space-6);
    overflow: visible;
  }

  body.has-sidebar .nav-links-group {
    justify-content: flex-end;
    gap: var(--space-4);
  }

  body.has-sidebar .nav-links-group a {
    flex-grow: 0;
    text-align: left;
    padding: var(--space-3) var(--space-4);
    border-radius: var(--border-radius);
  }

  body.has-sidebar .nav-links-group a + a {
    border-left: none;
  }
}

@media (max-width: 1024px) {
  .container {
    margin-top: var(--space-6);
    margin-bottom: var(--space-6);
    padding: 0 var(--space-6);
  }

  .main-content > section {
    padding: var(--space-6);
  }

  .article-body {
    flex-direction: column;
    gap: var(--space-4);
  }

  .institution-logos-container {
    flex-direction: row;
    flex-wrap: wrap;
    gap: var(--space-2);
    flex: none;
    justify-content: flex-start;
  }

  .institution-logo {
    margin: 0 0 var(--space-4) 0;
    max-width: 80px;
    max-height: 80px;
    width: 80px;
    height: 80px;
    align-self: flex-start;
  }

  .nav-links-group {
    gap: var(--space-3);
  }

  .nav-links-group a {
    font-size: var(--font-size-base);
    padding: var(--space-3) var(--space-4);
  }

  /* Responsive Typography for Tablets */
  section h2 {
    font-size: var(--font-size-2xl);
  }

  section h3, article h3 {
    font-size: var(--font-size-lg);
  }
}


@media (max-width: 768px) {
  .container {
    margin-top: var(--space-4) !important;
    margin-bottom: var(--space-4) !important;
    padding: 0 var(--space-4) !important;
    max-width: 100% !important;
  }

  .page-header,
  body.has-sidebar .page-header {
    justify-content: flex-start;
    margin-bottom: var(--space-4);
  }

  /* Ensure sidebar is not sticky/fixed on mobile */
  .sidebar,
  body.has-sidebar .sidebar {
    position: static !important;
    top: auto !important;
    left: auto !important;
    right: auto !important;
    width: auto !important;
    z-index: auto !important;
    background: var(--surface) !important;
    border: 1px solid var(--border-color) !important;
    border-radius: var(--border-radius-xl) !important;
    box-shadow: var(--shadow-sm) !important;
    grid-column: unset !important;
    grid-row: unset !important;
    margin-bottom: var(--space-4) !important;
  }

  /* Remove padding from body since nothing is fixed */
  body.has-sidebar {
    padding-top: 0 !important;
  }

  /* Show navigation header on mobile */
  .nav-header {
    display: flex !important;
  }

  /* Hide nav links by default on mobile */
  .nav-links-group {
    display: none;
    flex-direction: column !important;
    gap: var(--space-1);
    align-items: flex-start;
    margin-top: var(--space-4);
    padding-top: var(--space-4);
    opacity: 0;
    transform: translateY(-10px);
    transition: all var(--transition-slow) var(--easing-apple);
    max-height: 0;
    overflow: hidden;
  }

  /* Show nav links when expanded */
  .nav-links-group.expanded {
    display: flex !important;
    opacity: 1;
    transform: translateY(0);
    max-height: none;
    overflow: visible;
    animation: slideDownFadeIn 0.4s var(--easing-apple) forwards;
  }

  /* Collapsing animation */
  .nav-links-group.collapsing {
    display: flex !important;
    opacity: 0;
    transform: translateY(-10px);
    max-height: 0;
    overflow: hidden;
    animation: slideUpFadeOut 0.3s var(--easing-apple) forwards;
  }

  .nav-links-group a {
    font-size: var(--font-size-sm) !important;
    padding: var(--space-4) var(--space-5);
    width: 100%;
    border-radius: var(--border-radius-full);
    background: transparent;
    border: 1.5px solid var(--border-color);
    color: var(--text-primary);
    text-align: center;
    margin-bottom: var(--space-1);
    transition: all var(--transition-base) var(--easing-apple);
    opacity: 0;
    transform: translateX(-20px);
    font-weight: 500;
    display: flex;
    align-items: center;
    justify-content: center;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    box-sizing: border-box;
  }

  .nav-links-group.expanded a {
    opacity: 1;
    transform: translateX(0);
  }

  .nav-links-group.expanded a:nth-child(1) { animation-delay: 0.1s; animation: slideInLeft 0.3s var(--easing-apple) forwards; }
  .nav-links-group.expanded a:nth-child(2) { animation-delay: 0.2s; animation: slideInLeft 0.3s var(--easing-apple) forwards; }
  .nav-links-group.expanded a:nth-child(3) { animation-delay: 0.3s; animation: slideInLeft 0.3s var(--easing-apple) forwards; }
  .nav-links-group.expanded a:nth-child(4) { animation-delay: 0.4s; animation: slideInLeft 0.3s var(--easing-apple) forwards; }
  .nav-links-group.expanded a:nth-child(5) { animation-delay: 0.5s; animation: slideInLeft 0.3s var(--easing-apple) forwards; }

  .nav-links-group a:hover {
    color: var(--white) !important;
    background: var(--primary) !important;
    border-color: var(--primary) !important;
    transform: translateY(-var(--hover-translate-subtle)) scale(var(--hover-scale-subtle)) !important;
    box-shadow: 
      0 4px 16px rgba(0, 122, 255, 0.25),
      0 2px 8px rgba(0, 122, 255, 0.15) !important;
  }

  .nav-links-group a.active {
    color: var(--white);
    background: var(--primary);
    border-color: var(--primary);
    transform: translateY(-1px);
    box-shadow: 
      0 4px 16px rgba(0, 122, 255, 0.25),
      0 2px 8px rgba(0, 122, 255, 0.15);
  }

  /* Mobile Navigation */
  .page-header nav {
    padding: var(--space-4) !important;
    background: var(--surface);
    border-radius: var(--border-radius-xl) !important;
    border: 1px solid var(--border-color);
    transition: all var(--transition-slow) var(--easing-apple);
    overflow: hidden;
  }

  .page-header nav.expanded {
    box-shadow: var(--shadow-lg);
    transform: translateY(-2px);
    animation: gentleBounce 0.3s var(--easing-apple) forwards;
  }

  /* Show sidebar header on mobile */
  .sidebar-header {
    display: flex !important;
  }

  /* Hide sidebar content by default on mobile */
  .sidebar-content {
    display: none;
    margin-top: var(--space-4);
    padding-top: var(--space-4);
    opacity: 0;
    transform: translateY(-10px);
    transition: all var(--transition-slow) var(--easing-apple);
    max-height: 0;
    overflow: hidden;
  }

  /* Show sidebar content when expanded */
  .sidebar-content.expanded {
    display: block !important;
    opacity: 1;
    transform: translateY(0);
    max-height: none;
    overflow: visible;
    animation: slideDownFadeIn 0.4s var(--easing-apple) forwards;
  }

  /* Collapsing animation */
  .sidebar-content.collapsing {
    display: block !important;
    opacity: 0;
    transform: translateY(-10px);
    max-height: 0;
    overflow: hidden;
    animation: slideUpFadeOut 0.3s var(--easing-apple) forwards;
  }

  /* --- Mobile Typography & Layout Adjustments --- */
  section h2 {
    font-size: var(--font-size-xl) !important;
    margin-top: var(--space-4);
    margin-bottom: var(--space-4);
  }

  article h3 {
    font-size: var(--font-size-base) !important;
    margin-bottom: var(--space-3);
  }

  .main-content > section {
    padding: var(--space-4) !important;
    margin-bottom: var(--space-4);
    border-radius: var(--border-radius-xl) !important;
  }

  .main-content > section ul {
    font-size: var(--font-size-sm);
    padding-left: var(--space-5);
  }

  .main-content > section li {
    margin-bottom: var(--space-2);
    line-height: 1.5;
  }

  .article-body {
    flex-direction: column;
    margin-top: var(--space-3);
    gap: var(--space-3);
  }

  .institution-logos-container {
    flex-direction: row;
    flex-wrap: wrap;
    gap: var(--space-2);
    flex: none;
    justify-content: flex-start;
  }

  .institution-logo {
    margin: 0 0 var(--space-3) 0;
    max-width: 60px;
    max-height: 60px;
    width: 60px;
    height: 60px;
    align-self: flex-start;
  }

  .description-content {
    width: 100%;
  }

  .description-content h4 {
    font-size: var(--font-size-base);
    margin-top: 0;
    margin-bottom: var(--space-2);
  }

  .description-content p {
    font-size: var(--font-size-sm);
    line-height: 1.6;
    margin-bottom: var(--space-3);
  }

  .entry-details {
    font-size: var(--font-size-xs);
    margin-bottom: var(--space-2);
  }

  .related-links {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
    margin-top: var(--space-3);
    font-size: var(--font-size-xs);
  }

  .related-links a {
    margin-right: 0;
    padding: var(--space-2) var(--space-3);
    font-weight: 600;
    background: transparent;
    border: 1.5px solid var(--primary);
    color: var(--primary);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
  }

  .related-links a:hover {
    background: var(--primary);
    border-color: var(--primary);
    color: var(--white);
    box-shadow: 
      0 4px 16px rgba(0, 122, 255, 0.25),
      0 2px 8px rgba(0, 122, 255, 0.15);
  }

  .related-links a:hover i {
    color: var(--white);
  }

  .tag-container {
    margin-top: var(--space-3);
    gap: var(--space-2);
  }

  .tag {
    font-size: var(--font-size-xs) !important;
    padding: var(--space-1) var(--space-2);
  }

  /* Fix for toggle arrows on mobile */
  .toggle-arrow {
    font-size: var(--font-size-xs);
    margin-top: var(--space-3);
    margin-bottom: var(--space-2);
  }

  .extra-description {
    padding-top: var(--space-3);
    font-size: var(--font-size-sm);
  }

  /* Sidebar improvements for mobile */
  .sidebar {
    padding: var(--space-5) !important;
    margin-bottom: var(--space-6) !important;
    border-radius: var(--border-radius-xl) !important;
  }

  /* Ensure sidebar border-radius is consistently applied */
  aside.sidebar {
    border-radius: var(--border-radius-xl) !important;
    transition: all var(--transition-slow) var(--easing-apple);
    overflow: hidden;
  }

  aside.sidebar.expanded {
    box-shadow: var(--shadow-lg);
    transform: translateY(-2px);
    animation: gentleBounce 0.3s var(--easing-apple) forwards;
  }

  .sidebar .profile-image {
    width: 60%;
    margin-bottom: var(--space-4);
    opacity: 0;
    transform: scale(0.8);
    transition: all var(--transition-slow) var(--easing-apple);
  }

  .sidebar-content.expanded .profile-image {
    opacity: 1;
    transform: scale(1);
    animation: scaleIn 0.5s var(--easing-apple) forwards;
    animation-delay: 0.1s;
  }

  .sidebar-content.expanded .profile-image:hover {
    transform: scale(1.05);
  }

  /* Social links in sidebar - mobile improvements */
  .sidebar .social-links {
    gap: var(--space-2);
  }

  .sidebar .social-links a {
    font-size: var(--font-size-xs);
    padding: var(--space-3) var(--space-4);
    border-radius: var(--border-radius-pill);
    opacity: 0;
    transform: translateX(20px);
    transition: all var(--transition-base) var(--easing-apple);
    background: transparent;
    border: 1.5px solid var(--border-color);
    color: var(--text-primary);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
  }

  .sidebar-content.expanded .social-links a {
    opacity: 1;
    transform: translateX(0);
  }

  .sidebar-content.expanded .social-links a:nth-child(1) { animation: slideInRight 0.3s var(--easing-apple) forwards; animation-delay: 0.1s; }
  .sidebar-content.expanded .social-links a:nth-child(2) { animation: slideInRight 0.3s var(--easing-apple) forwards; animation-delay: 0.2s; }
  .sidebar-content.expanded .social-links a:nth-child(3) { animation: slideInRight 0.3s var(--easing-apple) forwards; animation-delay: 0.3s; }
  .sidebar-content.expanded .social-links a:nth-child(4) { animation: slideInRight 0.3s var(--easing-apple) forwards; animation-delay: 0.4s; }

  .sidebar .social-links a:hover {
    transform: translateY(-1px) scale(1.02);
    background: var(--primary);
    border-color: var(--primary);
    color: var(--white);
    box-shadow: 
      0 4px 16px rgba(0, 122, 255, 0.25),
      0 2px 8px rgba(0, 122, 255, 0.15);
  }

  .sidebar .social-links a i {
    font-size: var(--font-size-lg);
    margin-right: var(--space-2);
    color: var(--primary);
    transition: all var(--transition-base) var(--easing-apple);
  }

  .sidebar .social-links a:hover i {
    color: var(--white);
  }

  #toc-nav li a {
    padding: var(--space-3) var(--space-4);
    font-size: var(--font-size-sm);
    opacity: 0;
    transform: translateX(20px);
    transition: all var(--transition-base) var(--easing-apple);
  }

  .sidebar-content.expanded #toc-nav li a {
    opacity: 1;
    transform: translateX(0);
  }

  .sidebar-content.expanded #toc-nav li:nth-child(1) a { animation: slideInRight 0.3s var(--easing-apple) forwards; animation-delay: 0.5s; }
  .sidebar-content.expanded #toc-nav li:nth-child(2) a { animation: slideInRight 0.3s var(--easing-apple) forwards; animation-delay: 0.6s; }
  .sidebar-content.expanded #toc-nav li:nth-child(3) a { animation: slideInRight 0.3s var(--easing-apple) forwards; animation-delay: 0.7s; }
  .sidebar-content.expanded #toc-nav li:nth-child(4) a { animation: slideInRight 0.3s var(--easing-apple) forwards; animation-delay: 0.8s; }
  .sidebar-content.expanded #toc-nav li:nth-child(5) a { animation: slideInRight 0.3s var(--easing-apple) forwards; animation-delay: 0.9s; }

  #toc-nav li a:hover {
    transform: translateY(-1px) scale(1.02);
    box-shadow: var(--shadow-xs);
  }
}


/* --- Scroll to Top Button - Apple Design --- */
@keyframes pulseIn {
  0% {
    opacity: 0;
    transform: scale(0.8);
  }
  50% {
    opacity: 1;
    transform: scale(1.1);
  }
  100% {
    opacity: 1;
    transform: scale(1);
  }
}

#scrollTopBtn {
  display: none;
  position: fixed;
  bottom: var(--space-6);
  right: var(--space-6);
  z-index: 1000;
  border: 2px solid var(--primary);
  outline: none;
  background: transparent;
  color: var(--primary);
  cursor: pointer;
  padding: var(--space-4);
  border-radius: var(--border-radius-full);
  font-size: var(--font-size-xl);
  box-shadow: none;
  transition: all var(--transition-slow) var(--easing-apple);
  backdrop-filter: blur(10px);
  width: 56px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  animation: pulseIn 0.5s var(--easing-apple) forwards;
}

#scrollTopBtn:hover {
  background: var(--primary);
  color: var(--white);
  border-color: var(--primary);
  transform: translateY(-var(--hover-translate-medium)) scale(var(--hover-scale-medium));
  box-shadow: var(--shadow-sm);
}

#scrollTopBtn:active {
  transform: translateY(-var(--hover-translate-subtle)) scale(1);
}

/* ==========================================================================
   8. Download Button Styles - Apple Design System
   ========================================================================== */
.download-button-container {
  text-align: left;
  margin: 0 0 var(--space-6) 0;
}

.download-button {
  display: flex;
  align-items: center;
  justify-content: flex-start;
  background: var(--primary);
  color: var(--white);
  text-decoration: none;
  padding: var(--space-4) var(--space-8);
  border-radius: var(--border-radius-xl);
  font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Text', sans-serif;
  font-size: var(--font-size-base);
  font-weight: 600;
  transition: all var(--transition-base) var(--easing-apple);
  box-shadow: none;
  border: none;
  letter-spacing: -0.01em;
  animation: fadeInUp 0.6s var(--easing-apple) forwards;
  animation-delay: 0.5s;
  opacity: 0;
}

.download-button:hover {
  background: var(--primary-hover);
  color: var(--white);
  transform: translateY(-var(--hover-translate-subtle)) scale(var(--hover-scale-medium));
  box-shadow: var(--shadow-sm);
}

.download-button:active {
  transform: translateY(0) scale(1);
  box-shadow: var(--shadow-sm);
}

.download-button i {
  margin-right: var(--space-2);
  font-size: var(--font-size-lg);
  transition: all var(--transition-base) var(--easing-apple);
  color: inherit;
}

.download-button:hover i {
  color: var(--white);
}

/* General Button Class - Transparent with Stroke */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  color: var(--primary);
  text-decoration: none;
  padding: var(--space-3) var(--space-4);
  border-radius: var(--border-radius-pill);
  font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Text', sans-serif;
  font-size: var(--font-size-base);
  font-weight: 500;
  transition: all var(--transition-base) var(--easing-apple);
  border: 2px solid var(--primary);
  cursor: pointer;
  letter-spacing: -0.01em;
  box-shadow: none;
}

.btn:hover {
  background: var(--primary);
  color: var(--white);
  border-color: var(--primary);
  transform: translateY(-var(--hover-translate-subtle)) scale(var(--hover-scale-subtle));
  box-shadow: var(--shadow-xs);
}

.btn:active {
  transform: translateY(0) scale(1);
}

/* Button Variants */
.btn-secondary {
  color: var(--text-secondary);
  border-color: var(--text-secondary);
}

.btn-secondary:hover {
  background: var(--text-secondary);
  color: var(--white);
  border-color: var(--text-secondary);
}

.btn-small {
  padding: var(--space-2) var(--space-3);
  font-size: var(--font-size-sm);
}

.btn-large {
  padding: var(--space-4) var(--space-6);
  font-size: var(--font-size-lg);
}