/* XNLP Survey - Unified Design System (mohammadi.cv) */

/* ===== CSS Variables ===== */
:root {
  /* Primary Colors - Blue Palette */
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --secondary: #3b82f6;
  --accent: #60a5fa;
  --accent-light: #93c5fd;

  /* Text Colors */
  --text-primary: #1e293b;
  --text-secondary: #64748b;
  --text-muted: #94a3b8;

  /* Background Colors */
  --bg-white: #ffffff;
  --bg-light: #f8fafc;
  --bg-alt: #f1f5f9;
  --bg-dark: #e2e8f0;

  /* Semantic Colors */
  --success: #22c55e;
  --warning: #f59e0b;
  --error: #ef4444;

  /* Domain Colors */
  --medicine: #dc2626;
  --finance: #16a34a;
  --social: #ca8a04;
  --crm: #9333ea;
  --reviews: #0891b2;
  --hr: #ea580c;
  --chatbots: #db2777;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 2px 4px rgba(0, 0, 0, 0.05);
  --shadow-lg: 0 4px 6px rgba(0, 0, 0, 0.07);
  --shadow-xl: 0 10px 25px rgba(0, 0, 0, 0.1);

  /* Spacing */
  --container-max: 1200px;
  --section-padding: 5rem;
  --card-padding: 2rem;

  /* Border Radius */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;

  /* Transitions */
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
}

/* ===== Reset & Base ===== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--bg-white);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ===== Navigation ===== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: var(--bg-white);
  padding: 1rem 0;
  z-index: 1000;
  box-shadow: var(--shadow-md);
  transition: var(--transition-normal);
}

.navbar.scrolled {
  padding: 0.75rem 0;
  box-shadow: var(--shadow-lg);
}

.nav-container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav-logo {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--primary);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.nav-logo:hover {
  color: var(--primary-dark);
}

.nav-links {
  display: flex;
  gap: 0.5rem;
  list-style: none;
}

.nav-links a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 500;
  padding: 0.5rem 1rem;
  border-radius: var(--radius-sm);
  transition: var(--transition-fast);
}

.nav-links a:hover {
  color: var(--primary);
  background: var(--bg-light);
}

/* ===== Hero Section ===== */
.hero {
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
  position: relative;
  overflow: hidden;
  padding: 8rem 1.5rem 5rem;
  text-align: center;
  color: white;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-image: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.05'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
  opacity: 0.5;
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 900px;
  margin: 0 auto;
}

.hero h1 {
  font-size: 2.75rem;
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 1rem;
  letter-spacing: -0.02em;
}

.hero .subtitle {
  font-size: 1.25rem;
  opacity: 0.95;
  margin-bottom: 1rem;
  font-weight: 400;
}

.hero .journal {
  font-size: 1rem;
  opacity: 0.85;
  margin-bottom: 2rem;
  font-weight: 500;
}

.hero-buttons {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.875rem 1.75rem;
  border-radius: var(--radius-sm);
  font-size: 1rem;
  font-weight: 600;
  text-decoration: none;
  transition: var(--transition-fast);
  cursor: pointer;
  border: none;
}

.btn-primary {
  background: var(--bg-white);
  color: var(--primary);
}

.btn-primary:hover {
  background: var(--bg-light);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.15);
  color: white;
  border: 2px solid rgba(255, 255, 255, 0.4);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.25);
  border-color: rgba(255, 255, 255, 0.6);
}

/* ===== Sections ===== */
.section {
  padding: var(--section-padding) 1.5rem;
  max-width: var(--container-max);
  margin: 0 auto;
}

.section-alt {
  background: var(--bg-light);
}

.section-alt .section {
  max-width: 100%;
}

.section-alt > .section,
.section-alt .section-inner {
  max-width: var(--container-max);
  margin: 0 auto;
}

.section-header {
  margin-bottom: 3rem;
}

.section h2 {
  font-size: 2rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.75rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.section h2::before {
  content: '';
  width: 4px;
  height: 2rem;
  background: var(--primary);
  border-radius: 2px;
}

.section-subtitle {
  color: var(--text-secondary);
  font-size: 1.1rem;
  max-width: 700px;
  line-height: 1.7;
}

/* ===== Abstract ===== */
.abstract-content {
  background: var(--bg-white);
  padding: 2.5rem;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  font-size: 1.05rem;
  line-height: 1.8;
  color: var(--text-primary);
}

.abstract-content p {
  margin-bottom: 1rem;
}

.abstract-content p:last-child {
  margin-bottom: 0;
}

.abstract-content strong {
  color: var(--primary);
  font-weight: 600;
}

/* ===== Statistics Grid ===== */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1.5rem;
  margin-top: 2rem;
}

.stat-card {
  background: var(--bg-white);
  padding: 2rem 1.5rem;
  border-radius: var(--radius-md);
  text-align: center;
  box-shadow: var(--shadow-md);
  border-top: 4px solid var(--primary);
  transition: var(--transition-normal);
}

.stat-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-xl);
}

.stat-icon {
  font-size: 2.5rem;
  margin-bottom: 1rem;
}

.stat-number {
  font-size: 3rem;
  font-weight: 800;
  color: var(--primary);
  line-height: 1;
  margin-bottom: 0.5rem;
}

.stat-label {
  font-size: 0.95rem;
  color: var(--text-secondary);
  font-weight: 500;
}

/* ===== Taxonomy Visualization ===== */
.taxonomy-container {
  overflow-x: auto;
  padding: 2rem 0;
}

.taxonomy-tree {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2rem;
  min-width: 800px;
}

.taxonomy-level {
  display: flex;
  justify-content: center;
  gap: 2rem;
  width: 100%;
}

.taxonomy-root {
  margin-bottom: 1rem;
}

.taxonomy-root::after {
  content: '';
  display: block;
  width: 60%;
  height: 2px;
  background: var(--bg-dark);
  margin: 1.5rem auto 0;
}

.taxonomy-node {
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-sm);
  font-weight: 600;
  text-align: center;
  transition: var(--transition-fast);
}

.taxonomy-node:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.root-node {
  background: var(--primary);
  color: white;
  font-size: 1.25rem;
  padding: 1rem 2rem;
}

.taxonomy-branch {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
}

.taxonomy-branch::before {
  content: '';
  width: 2px;
  height: 20px;
  background: var(--bg-dark);
}

.cat-node {
  color: white;
  font-size: 1rem;
}

.cat-node.post-hoc {
  background: var(--medicine);
}

.cat-node.intrinsic {
  background: var(--finance);
}

.cat-node.llm-methods {
  background: var(--crm);
}

.taxonomy-children {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  justify-content: center;
}

.leaf-node {
  background: var(--bg-alt);
  color: var(--text-primary);
  font-size: 0.85rem;
  padding: 0.5rem 1rem;
  font-weight: 500;
}

/* ===== Charts Section ===== */
.charts-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
  gap: 2rem;
  margin-bottom: 2rem;
}

.chart-container {
  background: var(--bg-white);
  padding: 2rem;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
}

.chart-container h3 {
  color: var(--text-primary);
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 1.5rem;
  text-align: center;
}

.chart-container canvas {
  max-height: 300px;
}

.chart-container-wide {
  background: var(--bg-white);
  padding: 2rem;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  max-width: 700px;
  margin: 0 auto;
}

.chart-container-wide h3 {
  color: var(--text-primary);
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 1.5rem;
  text-align: center;
}

.chart-container-wide canvas {
  max-height: 400px;
}

/* ===== Key Findings Grid ===== */
.findings-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
  margin-top: 2rem;
}

.finding-card {
  background: var(--bg-white);
  padding: 1.75rem;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  border-top: 4px solid var(--accent);
  transition: var(--transition-normal);
}

.finding-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-xl);
}

.finding-card:nth-child(1) { border-top-color: var(--primary); }
.finding-card:nth-child(2) { border-top-color: var(--finance); }
.finding-card:nth-child(3) { border-top-color: var(--crm); }
.finding-card:nth-child(4) { border-top-color: var(--warning); }

.finding-card h3 {
  color: var(--text-primary);
  margin-bottom: 0.75rem;
  font-size: 1.15rem;
  font-weight: 600;
}

.finding-card p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.7;
}

/* ===== Domains Table ===== */
.table-container {
  overflow-x: auto;
  margin-top: 2rem;
}

.domains-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--bg-white);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-md);
}

.domains-table th {
  background: var(--primary);
  color: white;
  padding: 1rem 1.25rem;
  text-align: left;
  font-weight: 600;
  font-size: 0.95rem;
}

.domains-table td {
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--bg-dark);
  font-size: 0.95rem;
  color: var(--text-primary);
}

.domains-table tr:last-child td {
  border-bottom: none;
}

.domains-table tr:hover {
  background: var(--bg-light);
}

.domain-tag {
  display: inline-block;
  padding: 0.25rem 0.75rem;
  background: var(--bg-alt);
  border-radius: 20px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--primary);
}

/* ===== Resources Grid ===== */
.resources-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
  margin-top: 2rem;
}

.resource-card {
  background: var(--bg-white);
  padding: 1.5rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--bg-dark);
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  transition: var(--transition-normal);
}

.resource-card:hover {
  border-color: var(--primary);
  box-shadow: var(--shadow-md);
}

.resource-icon {
  width: 48px;
  height: 48px;
  background: var(--bg-light);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  flex-shrink: 0;
}

.resource-content h4 {
  color: var(--text-primary);
  margin-bottom: 0.5rem;
  font-weight: 600;
}

.resource-content p {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-bottom: 0.75rem;
  line-height: 1.6;
}

.resource-link {
  color: var(--primary);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
}

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

/* ===== Citation Box ===== */
.citation-box {
  background: var(--bg-alt);
  padding: 1.5rem;
  border-radius: var(--radius-md);
  font-family: 'Fira Code', 'Monaco', 'Consolas', monospace;
  font-size: 0.9rem;
  overflow-x: auto;
  position: relative;
  margin-top: 2rem;
}

.citation-box pre {
  margin: 0;
  white-space: pre-wrap;
  word-break: break-word;
  color: var(--text-primary);
}

.copy-btn {
  position: absolute;
  top: 1rem;
  right: 1rem;
  background: var(--primary);
  color: white;
  border: none;
  padding: 0.5rem 1rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 0.85rem;
  font-weight: 600;
  transition: var(--transition-fast);
}

.copy-btn:hover {
  background: var(--primary-dark);
}

.copy-btn.copied {
  background: var(--success);
}

/* ===== Footer ===== */
.footer {
  background: var(--text-primary);
  color: white;
  padding: 3rem 1.5rem;
  text-align: center;
}

.footer p {
  opacity: 0.8;
  margin-bottom: 0.75rem;
  font-size: 0.95rem;
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: 2rem;
  margin-top: 1.5rem;
}

.footer-links a {
  color: rgba(255, 255, 255, 0.8);
  text-decoration: none;
  font-weight: 500;
  transition: var(--transition-fast);
}

.footer-links a:hover {
  color: white;
}

/* ===== Utility Classes ===== */
.text-center {
  text-align: center;
}

.mt-2 {
  margin-top: 2rem;
}

.mb-2 {
  margin-bottom: 2rem;
}

/* ===== Responsive Design ===== */
@media (max-width: 768px) {
  .hero {
    padding: 6rem 1rem 3rem;
  }

  .hero h1 {
    font-size: 1.75rem;
  }

  .hero .subtitle {
    font-size: 1rem;
  }

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

  .nav-links {
    display: none;
  }

  .section {
    padding: 3rem 1rem;
  }

  .section h2 {
    font-size: 1.5rem;
  }

  .section h2::before {
    height: 1.5rem;
  }

  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
  }

  .stat-card {
    padding: 1.5rem 1rem;
  }

  .stat-number {
    font-size: 2rem;
  }

  .taxonomy-tree {
    min-width: 600px;
  }

  .taxonomy-level {
    gap: 1rem;
  }

  .charts-grid {
    grid-template-columns: 1fr;
  }

  .chart-container,
  .chart-container-wide {
    padding: 1.5rem;
  }

  .findings-grid,
  .resources-grid {
    grid-template-columns: 1fr;
  }

  .domains-table {
    font-size: 0.85rem;
  }

  .domains-table th,
  .domains-table td {
    padding: 0.75rem;
  }

  .abstract-content {
    padding: 1.5rem;
  }
}

/* ===== AOS Animation Overrides ===== */
[data-aos] {
  transition-timing-function: ease-out;
}

/* ===== Print Styles ===== */
@media print {
  .navbar,
  .hero-buttons,
  .copy-btn,
  .footer-links {
    display: none;
  }

  .hero {
    background: var(--primary);
    padding: 2rem;
  }

  .section {
    padding: 2rem 0;
  }
}