/* Ultra-Modern Premium Design System */
/* Context Rot - Apple & OpenAI Inspired Aesthetic */

/* Import refined typography */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&display=swap');

/* CSS Custom Properties - Ultra-Modern Design System */
:root {
  /* Refined Typography Scale */
  --font-family-display: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Inter", "Helvetica Neue", system-ui, sans-serif;
  --font-family-text: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Inter", "Helvetica Neue", system-ui, sans-serif;
  --font-family-mono: ui-monospace, "SF Mono", "JetBrains Mono", "Monaco", "Cascadia Code", "Roboto Mono", monospace;
  
  /* Font Weights */
  --font-weight-ultralight: 200;
  --font-weight-light: 300;
  --font-weight-regular: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  --font-weight-heavy: 800;
  --font-weight-black: 900;
  
  /* Typography Scale (8pt grid) */
  --text-xs: 0.75rem;    /* 12px */
  --text-sm: 0.875rem;   /* 14px */
  --text-base: 1rem;     /* 16px */
  --text-lg: 1.125rem;   /* 18px */
  --text-xl: 1.25rem;    /* 20px */
  --text-2xl: 1.5rem;    /* 24px */
  --text-3xl: 1.875rem;  /* 30px */
  --text-4xl: 2.25rem;   /* 36px */
  --text-5xl: 3rem;      /* 48px */
  --text-6xl: 3.75rem;   /* 60px */
  
  /* Refined Color System */
  --color-primary: #1a1a1a;
  --color-secondary: #2d2d2f;
  --color-accent: #0066cc;
  --color-accent-hover: #004499;
  --color-accent-light: #e6f2ff;
  --color-success: #28a745;
  --color-warning: #ffc107;
  --color-error: #dc3545;
  
  /* Ultra-Clean Neutral Scale */
  --color-white: #ffffff;
  --color-gray-25: #fcfcfc;
  --color-gray-50: #f8f9fa;
  --color-gray-100: #f1f3f4;
  --color-gray-200: #e8eaed;
  --color-gray-300: #dadce0;
  --color-gray-400: #bdc1c6;
  --color-gray-500: #9aa0a6;
  --color-gray-600: #80868b;
  --color-gray-700: #5f6368;
  --color-gray-800: #3c4043;
  --color-gray-900: #202124;
  
  /* Spacing Scale (8pt grid) */
  --space-1: 0.125rem;   /* 2px */
  --space-2: 0.25rem;    /* 4px */
  --space-3: 0.375rem;   /* 6px */
  --space-4: 0.5rem;     /* 8px */
  --space-5: 0.625rem;   /* 10px */
  --space-6: 0.75rem;    /* 12px */
  --space-8: 1rem;       /* 16px */
  --space-10: 1.25rem;   /* 20px */
  --space-12: 1.5rem;    /* 24px */
  --space-16: 2rem;      /* 32px */
  --space-20: 2.5rem;    /* 40px */
  --space-24: 3rem;      /* 48px */
  --space-32: 4rem;      /* 64px */
  --space-40: 5rem;      /* 80px */
  --space-48: 6rem;      /* 96px */
  --space-64: 8rem;      /* 128px */
  
  /* Border Radius */
  --radius-sm: 0.25rem;   /* 4px */
  --radius-md: 0.5rem;    /* 8px */
  --radius-lg: 0.75rem;   /* 12px */
  --radius-xl: 1rem;      /* 16px */
  --radius-2xl: 1.5rem;   /* 24px */
  --radius-full: 50%;
  
  /* Refined Shadows */
  --shadow-xs: 0 1px 2px 0 rgba(0, 0, 0, 0.03);
  --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.06), 0 1px 2px -1px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 4px 8px -2px rgba(0, 0, 0, 0.08), 0 2px 4px -2px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 12px 20px -4px rgba(0, 0, 0, 0.08), 0 4px 8px -4px rgba(0, 0, 0, 0.06);
  --shadow-xl: 0 24px 40px -8px rgba(0, 0, 0, 0.1), 0 8px 16px -8px rgba(0, 0, 0, 0.08);
  --shadow-elegant: 0 2px 16px rgba(0, 0, 0, 0.04), 0 1px 4px rgba(0, 0, 0, 0.08);
  
  /* Refined Animations */
  --transition-micro: 0.1s cubic-bezier(0.4, 0.0, 0.2, 1);
  --transition-fast: 0.15s cubic-bezier(0.4, 0.0, 0.2, 1);
  --transition-base: 0.2s cubic-bezier(0.4, 0.0, 0.2, 1);
  --transition-slow: 0.3s cubic-bezier(0.4, 0.0, 0.2, 1);
  --transition-bounce: 0.4s cubic-bezier(0.68, -0.55, 0.265, 1.55);
  
  /* Content Widths */
  --max-width-sm: 640px;
  --max-width-md: 768px;
  --max-width-lg: 1024px;
  --max-width-xl: 1280px;
  --max-width-content: 800px;
}

/* Dark mode support */
@media (prefers-color-scheme: dark) {
  :root {
    --color-primary: #FFFFFF;
    --color-secondary: #F5F5F7;
    --color-white: #000000;
    --color-gray-50: #1C1C1E;
    --color-gray-100: #2C2C2E;
    --color-gray-200: #3A3A3C;
    --color-gray-300: #48484A;
    --color-gray-400: #636366;
    --color-gray-500: #8E8E93;
    --color-gray-600: #AEAEB2;
    --color-gray-700: #C7C7CC;
    --color-gray-800: #D1D1D6;
    --color-gray-900: #F2F2F7;
  }
}

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

html {
  font-size: 16px;
  line-height: 1.5;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-family-text);
  font-weight: var(--font-weight-regular);
  font-size: var(--text-base);
  line-height: 1.6;
  color: var(--color-primary);
  background-color: var(--color-white);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

/* Typography Hierarchy */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-family-display);
  font-weight: var(--font-weight-semibold);
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-6);
  color: var(--color-primary);
}

h1 {
  font-size: var(--text-4xl);
  font-weight: var(--font-weight-bold);
  letter-spacing: -0.04em;
}

h2 {
  font-size: var(--text-3xl);
  margin-top: var(--space-12);
}

h3 {
  font-size: var(--text-2xl);
  margin-top: var(--space-10);
}

h4 {
  font-size: var(--text-xl);
  margin-top: var(--space-8);
}

p {
  margin-bottom: var(--space-6);
  line-height: 1.7;
}

/* Minimal Header */
.site-header {
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: saturate(180%) blur(24px);
  -webkit-backdrop-filter: saturate(180%) blur(24px);
  border-bottom: 0.5px solid var(--color-gray-200);
  padding: var(--space-4) 0;
  position: sticky;
  top: 0;
  z-index: 1000;
  transition: all var(--transition-base);
}

.site-header-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: var(--max-width-xl);
  margin: 0 auto;
  padding: 0 var(--space-10);
}

.site-logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
  transition: all var(--transition-base);
}

.site-logo:hover {
  opacity: 0.8;
}

.site-avatar {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-full);
  border: 2px solid var(--color-accent);
  transition: all var(--transition-base);
}

.site-name {
  font-family: var(--font-family-display);
  font-size: var(--text-lg);
  font-weight: var(--font-weight-semibold);
  color: var(--color-primary);
  letter-spacing: -0.02em;
}

/* Social Navigation */
.social-nav {
  display: flex;
  align-items: center;
  gap: var(--space-6);
}

.social-link {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-lg);
  transition: all var(--transition-base);
  text-decoration: none;
}

.social-link:hover {
  background: var(--color-gray-50);
  transform: translateY(-1px);
}

.social-icon {
  width: 18px;
  height: 18px;
  opacity: 0.7;
  transition: all var(--transition-base);
}

.social-link:hover .social-icon {
  opacity: 1;
}

/* Page Hero */
.page-hero {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-32);
  align-items: center;
  margin: var(--space-32) 0 var(--space-48) 0;
  min-height: 70vh;
}

.hero-content {
  order: 1;
}

.hero-visual {
  order: 2;
}

.page-title {
  font-size: clamp(var(--text-5xl), 8vw, 5rem);
  font-weight: var(--font-weight-black);
  font-family: var(--font-family-display);
  letter-spacing: -0.05em;
  margin-bottom: var(--space-8);
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-accent) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.1;
}

.page-subtitle {
  font-size: var(--text-3xl);
  font-weight: var(--font-weight-light);
  color: var(--color-gray-600);
  margin-bottom: var(--space-12);
  letter-spacing: -0.02em;
}

.page-description {
  font-size: var(--text-xl);
  line-height: 1.7;
  color: var(--color-gray-700);
  max-width: 540px;
}

.hero-image {
  width: 100%;
  height: auto;
  border-radius: var(--radius-2xl);
  box-shadow: var(--shadow-elegant);
  will-change: transform;
}

/* Icon Styling */
.guide-icon,
.section-icon {
  width: 32px;
  height: 32px;
  margin-right: var(--space-3);
  opacity: 0.8;
  transition: all var(--transition-base);
}

.guide-header,
.section-header {
  display: flex;
  align-items: center;
  margin-bottom: var(--space-6);
}

.guide-header h3,
.section-header h2 {
  margin-bottom: 0;
}

.guide-icon:hover,
.section-icon:hover {
  opacity: 1;
  transform: scale(1.05);
}

/* Main Content */
.page-content {
  min-height: 80vh;
  padding: var(--space-8) 0 var(--space-16) 0;
}

.wrapper {
  max-width: var(--max-width-xl);
  margin: 0 auto;
  padding: 0 var(--space-10);
}

/* Ultra-Modern Cards and Containers */
.modern-card {
  background: var(--color-white);
  border-radius: var(--radius-2xl);
  padding: var(--space-12);
  box-shadow: var(--shadow-elegant);
  border: 0.5px solid var(--color-gray-200);
  transition: all var(--transition-base);
}

.modern-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
  border-color: var(--color-gray-300);
}

/* Ultra-Modern ArXiv Paper Styling */
.arxiv-paper {
  background: var(--color-white);
  margin: var(--space-20) 0;
  padding: var(--space-32);
  box-shadow: var(--shadow-elegant);
  border-radius: var(--radius-2xl);
  border: 0.5px solid var(--color-gray-200);
  transition: all var(--transition-slow);
  position: relative;
}

.arxiv-paper::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--color-accent), var(--color-accent-light));
  border-radius: var(--radius-2xl) var(--radius-2xl) 0 0;
}

.paper-header {
  border-bottom: 0.5px solid var(--color-gray-200);
  padding-bottom: var(--space-20);
  margin-bottom: var(--space-20);
}

.paper-title {
  font-size: var(--text-5xl);
  font-weight: var(--font-weight-heavy);
  color: var(--color-primary);
  margin-bottom: var(--space-10);
  line-height: 1.1;
  letter-spacing: -0.04em;
  font-family: var(--font-family-display);
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-gray-700) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.paper-meta {
  font-size: var(--text-sm);
  color: var(--color-gray-600);
}

.author-section {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  margin-bottom: var(--space-4);
}

.author-avatar {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-full);
  border: 2px solid var(--color-accent);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-base);
}

.author-avatar:hover {
  transform: scale(1.1);
  box-shadow: var(--shadow-md);
}

.authors {
  font-weight: var(--font-weight-medium);
  color: var(--color-primary);
  flex: 1;
}

.affiliation {
  font-style: italic;
  margin-bottom: var(--space-4);
  color: var(--color-gray-600);
}

.paper-info {
  display: flex;
  gap: var(--space-8);
  margin-bottom: var(--space-4);
  flex-wrap: wrap;
}

.arxiv-id {
  font-family: var(--font-family-mono);
  background: var(--color-gray-100);
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-md);
  font-size: var(--text-xs);
  color: var(--color-gray-700);
  font-weight: var(--font-weight-medium);
}

.categories {
  margin-top: var(--space-4);
}

.category {
  background: var(--color-accent);
  color: var(--color-white);
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-md);
  font-size: var(--text-xs);
  font-weight: var(--font-weight-medium);
  margin-right: var(--space-2);
  display: inline-block;
  margin-bottom: var(--space-2);
  letter-spacing: 0.02em;
  text-transform: uppercase;
  min-width: 48px;
  text-align: center;
}

/* Ultra-Modern Abstract */
.abstract {
  background: linear-gradient(135deg, var(--color-gray-25) 0%, var(--color-gray-50) 100%);
  padding: var(--space-12);
  border-left: 3px solid var(--color-accent);
  margin: var(--space-20) 0;
  border-radius: 0 var(--radius-xl) var(--radius-xl) 0;
  box-shadow: var(--shadow-elegant);
  border: 0.5px solid var(--color-gray-200);
  border-left: 3px solid var(--color-accent);
  position: relative;
}

.abstract::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 3px;
  height: 100%;
  background: linear-gradient(180deg, var(--color-accent) 0%, var(--color-accent-light) 100%);
  border-radius: 0 0 0 var(--radius-xl);
}

.abstract h2 {
  margin-top: 0;
  font-size: var(--text-lg);
  color: var(--color-primary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--space-4);
}

.abstract p {
  margin-bottom: 0;
  font-size: var(--text-base);
  text-align: justify;
  line-height: 1.7;
}

/* Paper Content */
.paper-content {
  font-size: var(--text-lg);
  line-height: 1.7;
  text-align: justify;
  color: var(--color-primary);
}

.paper-content h1,
.paper-content h2,
.paper-content h3,
.paper-content h4 {
  color: var(--color-primary);
  margin-top: var(--space-16);
  margin-bottom: var(--space-6);
  font-family: var(--font-family-display);
}

.paper-content p {
  margin-bottom: var(--space-6);
}

.paper-content blockquote {
  border-left: 4px solid var(--color-gray-300);
  padding-left: var(--space-6);
  margin: var(--space-8) 0;
  font-style: italic;
  color: var(--color-gray-600);
  background: var(--color-gray-50);
  padding: var(--space-6);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
}

.paper-content code {
  background: var(--color-gray-100);
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-sm);
  font-family: var(--font-family-mono);
  font-size: 0.9em;
  color: var(--color-gray-800);
}

.paper-content pre {
  background: var(--color-gray-100);
  padding: var(--space-6);
  border-radius: var(--radius-lg);
  overflow-x: auto;
  border: 1px solid var(--color-gray-200);
  margin: var(--space-8) 0;
}

/* Ultra-Modern Buttons and Interactive Elements */
.modern-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-4) var(--space-8);
  background: var(--color-accent);
  color: var(--color-white);
  text-decoration: none;
  border-radius: var(--radius-xl);
  font-size: var(--text-base);
  font-weight: var(--font-weight-medium);
  border: none;
  cursor: pointer;
  transition: all var(--transition-base);
  min-height: 48px;
  gap: var(--space-3);
  box-shadow: var(--shadow-elegant);
  letter-spacing: -0.01em;
}

.modern-button:hover {
  background: var(--color-accent-hover);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.modern-button:active {
  transform: translateY(-1px);
  transition-duration: 0.1s;
}

.modern-button.secondary {
  background: var(--color-gray-50);
  color: var(--color-primary);
  border: 0.5px solid var(--color-gray-300);
}

.modern-button.secondary:hover {
  background: var(--color-gray-100);
  border-color: var(--color-gray-400);
}

/* Paper Actions */
.paper-footer {
  border-top: 1px solid var(--color-gray-200);
  padding-top: var(--space-16);
  margin-top: var(--space-24);
}

.paper-actions {
  display: flex;
  gap: var(--space-4);
  margin-bottom: var(--space-8);
  flex-wrap: wrap;
}

.source-link,
.feedback-link {
  @extend .modern-button;
}

.feedback-help {
  background: linear-gradient(135deg, #FFF3CD, #FCE4A6);
  border: 1px solid #F6E05E;
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  margin-top: var(--space-8);
}

.feedback-help p {
  margin: 0;
  font-size: var(--text-sm);
  color: #92400E;
  font-weight: var(--font-weight-medium);
}

/* Interaction Section */
.interaction-section {
  margin: var(--space-48) 0;
  padding: var(--space-32);
  background: linear-gradient(135deg, var(--color-gray-25) 0%, var(--color-gray-50) 100%);
  border-radius: var(--radius-2xl);
  border: 0.5px solid var(--color-gray-200);
  box-shadow: var(--shadow-elegant);
}

.guide-content {
  max-width: 800px;
}

.guide-content p {
  font-size: var(--text-lg);
  line-height: 1.7;
  margin-bottom: var(--space-6);
  color: var(--color-gray-700);
}

/* Process Steps */
.process-steps {
  margin-bottom: var(--space-12);
}

.process-step {
  display: flex;
  align-items: flex-start;
  gap: var(--space-6);
  margin-bottom: var(--space-10);
  padding: var(--space-6);
  background: var(--color-white);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-sm);
  border: 0.5px solid var(--color-gray-200);
  transition: all var(--transition-base);
}

.process-step:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.step-icon {
  width: 64px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-gray-50);
  border-radius: var(--radius-xl);
  flex-shrink: 0;
  border: 1px solid var(--color-gray-200);
}

.step-icon-img {
  width: 32px;
  height: 32px;
  opacity: 0.9;
}

.step-content h3 {
  font-size: var(--text-xl);
  font-weight: var(--font-weight-semibold);
  color: var(--color-primary);
  margin-bottom: var(--space-3);
  font-family: var(--font-family-display);
}

.step-content p {
  font-size: var(--text-base);
  line-height: 1.6;
  color: var(--color-gray-700);
  margin: 0;
}

/* Philosophy Note */
.philosophy-note {
  background: linear-gradient(135deg, var(--color-gray-25) 0%, var(--color-white) 100%);
  border: 0.5px solid var(--color-gray-200);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  margin: var(--space-12) 0;
  border-left: 3px solid var(--color-accent);
}

.philosophy-note p {
  font-size: var(--text-lg);
  line-height: 1.7;
  color: var(--color-gray-800);
  margin-bottom: var(--space-6);
}

.philosophy-note p:last-child {
  margin-bottom: 0;
}

.cta-box {
  background: var(--color-accent-light);
  border: 1px solid var(--color-accent);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  margin-top: var(--space-12);
}

.cta-box p {
  margin: 0;
  color: var(--color-accent-hover);
  font-weight: var(--font-weight-medium);
  font-size: var(--text-lg);
}

/* Post Lists */
.recent-papers {
  margin: var(--space-48) 0;
}

.recent-papers h2 {
  color: var(--color-primary);
  text-align: left;
  margin-bottom: var(--space-20);
  font-size: var(--text-4xl);
  font-weight: var(--font-weight-bold);
}

.post-list {
  list-style: none;
  padding: 0;
  margin: var(--space-20) 0;
  display: grid;
  gap: var(--space-12);
}

.post-list li {
  background: var(--color-white);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-gray-200);
  transition: all var(--transition-base);
  overflow: hidden;
}

.post-list li:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
}

.paper-preview {
  padding: var(--space-16);
  position: relative;
}

.paper-preview::before {
  content: '';
  position: absolute;
  top: var(--space-4);
  right: var(--space-4);
  width: 24px;
  height: 24px;
  background-image: url('../images/entropy-icon.svg');
  background-size: contain;
  background-repeat: no-repeat;
  opacity: 0.3;
  transition: opacity var(--transition-base);
}

.paper-preview:hover::before {
  opacity: 0.6;
}

.paper-preview .post-link a {
  font-size: var(--text-3xl);
  font-weight: var(--font-weight-semibold);
  color: var(--color-primary);
  text-decoration: none;
  line-height: 1.3;
  font-family: var(--font-family-display);
  letter-spacing: -0.02em;
}

.paper-preview .post-link a:hover {
  color: var(--color-accent);
}

.read-paper {
  @extend .modern-button;
  margin-top: var(--space-6);
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
}

.button-arrow {
  width: 16px;
  height: 16px;
  transition: transform var(--transition-base);
}

.read-paper:hover .button-arrow {
  transform: translateX(2px);
}

/* Footer */
.site-footer {
  background: var(--color-gray-900);
  background-image: 
    linear-gradient(135deg, rgba(0, 102, 204, 0.03), transparent 50%),
    url('../images/research-viz.png');
  background-size: cover, 800px 600px;
  background-position: center, bottom right;
  background-repeat: no-repeat;
  color: var(--color-white);
  padding: var(--space-24) 0;
  margin-top: var(--space-32);
  position: relative;
}

.site-footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--color-gray-900);
  opacity: 0.85;
  z-index: 1;
}

.site-footer .wrapper {
  max-width: var(--max-width-lg);
  margin: 0 auto;
  padding: 0 var(--space-6);
  position: relative;
  z-index: 2;
}

.footer-heading {
  text-align: center;
  margin-bottom: var(--space-16);
  font-size: var(--text-2xl);
  font-weight: var(--font-weight-medium);
  color: var(--color-white);
}

.footer-col-wrapper {
  display: grid;
  grid-template-columns: 1fr 1fr 2fr;
  gap: var(--space-16);
  align-items: start;
}

.contact-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.contact-list li {
  margin-bottom: var(--space-3);
}

.contact-list a {
  color: var(--color-gray-300);
  text-decoration: none;
  transition: color var(--transition-base);
}

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

.social-media-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  gap: var(--space-4);
  align-items: center;
  justify-content: center;
}

.social-media-list a {
  color: var(--color-gray-300);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3);
  border-radius: var(--radius-lg);
  transition: all var(--transition-base);
}

.social-media-list a:hover {
  background-color: rgba(0, 122, 255, 0.1);
  color: var(--color-accent);
}

/* Sophisticated Micro-Animations */
@keyframes gentle-float {
  0%, 100% { transform: translateY(0px); }
  50% { transform: translateY(-2px); }
}

@keyframes fade-in-up {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes scale-in {
  from {
    opacity: 0;
    transform: scale(0.9);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

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

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

@keyframes icon-pulse {
  0% { transform: scale(1); }
  50% { transform: scale(1.1); }
  100% { transform: scale(1); }
}

@keyframes demo-highlight {
  0% { background-color: transparent; }
  50% { background-color: rgba(0, 102, 204, 0.2); }
  100% { background-color: rgba(0, 102, 204, 0.1); }
}

@keyframes ripple {
  0% {
    transform: scale(0);
    opacity: 0.6;
  }
  100% {
    transform: scale(4);
    opacity: 0;
  }
}

/* Animation Classes */
.animate-on-scroll {
  opacity: 0;
  transform: translateY(30px);
  transition: all 0.6s cubic-bezier(0.4, 0.0, 0.2, 1);
}

.animate-on-scroll.animate-in {
  opacity: 1;
  transform: translateY(0);
}

.animate-on-scroll:nth-child(2) { transition-delay: 0.1s; }
.animate-on-scroll:nth-child(3) { transition-delay: 0.2s; }
.animate-on-scroll:nth-child(4) { transition-delay: 0.3s; }

.float-on-hover:hover {
  animation: gentle-float 2s ease-in-out infinite;
}

/* Enhanced Interactive States */
.post-list li,
.modern-card,
.arxiv-paper {
  will-change: transform, box-shadow;
  transition: all var(--transition-base);
}

.post-list li:hover,
.modern-card:hover {
  transform: translateY(-8px) scale(1.02);
  box-shadow: var(--shadow-xl);
}

/* Demo System Styles */
.demo-text-container {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  z-index: 10000;
  background: var(--color-white);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-xl);
  padding: var(--space-6);
  border: 2px solid var(--color-accent);
  max-width: 400px;
  opacity: 0;
  transform: translate(-50%, -50%) scale(0.8);
  transition: all var(--transition-slow);
}

.demo-text-container.demo-active {
  opacity: 1;
  transform: translate(-50%, -50%) scale(1);
}

.demo-text-container.demo-fade-out {
  opacity: 0;
  transform: translate(-50%, -50%) scale(0.9);
}

.demo-text {
  font-size: var(--text-lg);
  color: var(--color-primary);
  margin-bottom: var(--space-4);
  text-align: center;
}

.demo-highlight {
  background: linear-gradient(135deg, rgba(0, 102, 204, 0.1), rgba(0, 102, 204, 0.2));
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-accent);
  transition: all var(--transition-base);
}

.demo-highlight.demo-selected {
  animation: demo-highlight 1.5s ease-in-out;
  background: rgba(0, 102, 204, 0.15);
}

.demo-close {
  position: absolute;
  top: var(--space-2);
  right: var(--space-3);
  cursor: pointer;
  font-size: var(--text-xl);
  color: var(--color-gray-500);
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-full);
  transition: all var(--transition-base);
}

.demo-close:hover {
  background: var(--color-gray-100);
  color: var(--color-gray-700);
}

.demo-tooltip {
  position: fixed;
  bottom: var(--space-8);
  right: var(--space-8);
  z-index: 10001;
  background: var(--color-white);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-xl);
  border: 1px solid var(--color-gray-200);
  max-width: 320px;
  opacity: 0;
  transform: translateY(20px) scale(0.95);
  transition: all var(--transition-slow);
}

.demo-tooltip.demo-tooltip-active {
  opacity: 1;
  transform: translateY(0) scale(1);
}

.demo-tooltip.demo-fade-out {
  opacity: 0;
  transform: translateY(10px) scale(0.95);
}

.demo-tooltip-content {
  padding: var(--space-6);
}

.demo-tooltip-header {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin-bottom: var(--space-6);
  color: var(--color-accent);
  font-weight: var(--font-weight-semibold);
}

.demo-steps {
  margin-bottom: var(--space-4);
}

.demo-step {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-3);
  font-size: var(--text-sm);
  color: var(--color-gray-700);
}

.demo-step-number {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 20px;
  height: 20px;
  background: var(--color-accent);
  color: var(--color-white);
  border-radius: var(--radius-full);
  font-size: var(--text-xs);
  font-weight: var(--font-weight-bold);
  flex-shrink: 0;
}

.demo-rl-note {
  background: var(--color-gray-50);
  border: 1px solid var(--color-gray-200);
  border-radius: var(--radius-md);
  padding: var(--space-3);
  margin-bottom: var(--space-4);
  color: var(--color-gray-600);
  text-align: center;
}

.demo-tooltip p {
  color: var(--color-gray-600);
  font-size: var(--text-sm);
  line-height: 1.5;
  margin-bottom: var(--space-4);
}

.category {
  transition: all var(--transition-base);
}

.demo-dismiss {
  background: var(--color-accent);
  color: var(--color-white);
  border: none;
  border-radius: var(--radius-lg);
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-sm);
  font-weight: var(--font-weight-medium);
  cursor: pointer;
  transition: all var(--transition-base);
}

.demo-dismiss:hover {
  background: var(--color-accent-hover);
  transform: translateY(-1px);
}

/* Ripple Effect */
.ripple-effect {
  position: absolute;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.6);
  pointer-events: none;
  animation: ripple 0.6s ease-out;
}

/* Enhanced Card Effects */
.paper-preview,
.modern-card {
  transition: all var(--transition-base);
  transform-style: preserve-3d;
}

.paper-preview:hover,
.modern-card:hover {
  box-shadow: 
    0 20px 40px -12px rgba(0, 0, 0, 0.12),
    0 8px 16px -8px rgba(0, 0, 0, 0.08);
}

/* Progressive Disclosure Effects */
.widen-on-scroll {
  width: 60%;
  transition: width 0.8s cubic-bezier(0.4, 0.0, 0.2, 1);
}

.widen-on-scroll.animate-in {
  width: 100%;
}

.interaction-section {
  overflow: hidden;
}

.guide-content {
  max-width: 70%;
  transition: max-width 0.8s cubic-bezier(0.4, 0.0, 0.2, 1);
}

.interaction-section.animate-in .guide-content {
  max-width: 800px;
}

/* Staggered Hero Animations */
.hero-content .page-title {
  opacity: 0;
  transform: translateY(30px);
  transition: all 0.6s cubic-bezier(0.4, 0.0, 0.2, 1) 0.1s;
}

.hero-content .page-subtitle {
  opacity: 0;
  transform: translateY(30px);
  transition: all 0.6s cubic-bezier(0.4, 0.0, 0.2, 1) 0.3s;
}

.hero-content .page-description {
  opacity: 0;
  transform: translateY(30px);
  transition: all 0.6s cubic-bezier(0.4, 0.0, 0.2, 1) 0.5s;
}

.hero-content.animate-in .page-title,
.hero-content.animate-in .page-subtitle,
.hero-content.animate-in .page-description {
  opacity: 1;
  transform: translateY(0);
}

.hero-visual .hero-image {
  opacity: 0;
  transform: translateX(30px) scale(0.95);
  transition: all 0.8s cubic-bezier(0.4, 0.0, 0.2, 1) 0.2s;
}

.hero-visual.animate-in .hero-image {
  opacity: 1;
  transform: translateX(0) scale(1);
}

/* Section Slide-ins */
.recent-papers {
  transform: translateY(40px);
  opacity: 0;
  transition: all 0.8s cubic-bezier(0.4, 0.0, 0.2, 1);
}

.recent-papers.animate-in {
  transform: translateY(0);
  opacity: 1;
}

/* Paper Card Stagger */
.post-list li {
  opacity: 0;
  transform: translateY(20px);
  transition: all 0.5s cubic-bezier(0.4, 0.0, 0.2, 1);
}

.post-list li:nth-child(1).animate-in { transition-delay: 0.1s; }
.post-list li:nth-child(2).animate-in { transition-delay: 0.2s; }
.post-list li:nth-child(3).animate-in { transition-delay: 0.3s; }
.post-list li:nth-child(4).animate-in { transition-delay: 0.4s; }

.post-list li.animate-in {
  opacity: 1;
  transform: translateY(0);
}

/* Refined Focus States */
.modern-button:focus,
.site-title a:focus {
  outline: 2px solid var(--color-accent-light);
  outline-offset: 2px;
}

/* Dark Mode Improvements */
@media (prefers-color-scheme: dark) {
  .site-header {
    background: rgba(0, 0, 0, 0.92);
    border-bottom-color: var(--color-gray-300);
  }
  
  .arxiv-paper,
  .modern-card,
  .home-intro {
    background: linear-gradient(135deg, var(--color-gray-50) 0%, var(--color-gray-100) 100%);
  }
  
  .abstract {
    background: linear-gradient(135deg, var(--color-gray-100) 0%, var(--color-gray-200) 100%);
  }
}

/* Page Load Animation */
.page-loader {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: var(--color-accent);
  transform: translateX(-100%);
  animation: page-load 1.5s ease-out forwards;
  z-index: 10000;
}

@keyframes page-load {
  0% { transform: translateX(-100%); }
  50% { transform: translateX(-20%); }
  100% { transform: translateX(100%); }
}

/* Reduced Motion Preferences */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  
  .page-loader {
    display: none;
  }
}

/* Enhanced Responsive Design */
@media (max-width: 768px) {
  .wrapper {
    padding: 0 var(--space-6);
  }
  
  .arxiv-paper {
    padding: var(--space-12);
    margin: var(--space-12) 0;
  }
  
  .paper-title {
    font-size: var(--text-4xl);
    letter-spacing: -0.03em;
  }
  
  .paper-info {
    flex-direction: column;
    gap: var(--space-4);
  }
  
  .paper-actions {
    flex-direction: column;
    gap: var(--space-3);
  }
  
  .site-header-content {
    flex-direction: column;
    gap: var(--space-6);
  }
  
  .site-avatar {
    width: 60px;
    height: 60px;
  }
  
  .site-title a {
    font-size: var(--text-2xl);
    letter-spacing: -0.02em;
  }
  
  .page-hero {
    grid-template-columns: 1fr;
    gap: var(--space-16);
    text-align: center;
    min-height: auto;
    margin: var(--space-20) 0;
  }
  
  .hero-content {
    order: 2;
  }
  
  .hero-visual {
    order: 1;
  }
  
  .page-title {
    font-size: var(--text-4xl);
    letter-spacing: -0.03em;
  }
  
  .page-subtitle {
    font-size: var(--text-xl);
  }
  
  .page-description {
    font-size: var(--text-lg);
    max-width: none;
  }
  
  .interaction-section {
    padding: var(--space-16);
    margin: var(--space-24) 0;
  }
  
  .guide-content p {
    font-size: var(--text-base);
  }
  
  .guide-icon,
  .section-icon {
    width: 24px;
    height: 24px;
  }
  
  .footer-col-wrapper {
    grid-template-columns: 1fr;
    gap: var(--space-12);
    text-align: center;
  }
  
  .footer-col-3 {
    justify-self: center;
    text-align: center;
  }
  
  .social-media-list {
    justify-content: center;
  }
}

/* Ultra-Wide Screen Enhancements */
@media (min-width: 1400px) {
  .wrapper {
    max-width: var(--max-width-xl);
  }
  
  .arxiv-paper {
    padding: var(--space-40);
  }
  
  .paper-title {
    font-size: var(--text-6xl);
  }
}