/* ============================================
   CPP Electroweak Series - Stylesheet
   Hyperphysics Research Institute
   ============================================ */

@import url('https://fonts.googleapis.com/css2?family=Cormorant+Garamond:ital,wght@0,400;0,600;0,700;1,400&family=JetBrains+Mono:wght@400;500&family=Source+Sans+3:wght@300;400;500;600&display=swap');

:root {
  /* Color Palette - Deep Scientific */
  --bg-primary: #0a0c10;
  --bg-secondary: #12151c;
  --bg-tertiary: #1a1e28;
  --bg-card: #151922;
  
  --text-primary: #e8eaed;
  --text-secondary: #9aa0a9;
  --text-muted: #5f6672;
  
  --accent-gold: #c9a227;
  --accent-gold-dim: rgba(201, 162, 39, 0.15);
  --accent-blue: #4a9eff;
  --accent-blue-dim: rgba(74, 158, 255, 0.1);
  --accent-green: #34d399;
  --accent-red: #ef4444;
  
  --border-subtle: rgba(255, 255, 255, 0.06);
  --border-medium: rgba(255, 255, 255, 0.1);
  
  /* Typography */
  --font-display: 'Cormorant Garamond', Georgia, serif;
  --font-body: 'Source Sans 3', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
  
  /* Spacing */
  --nav-width: 280px;
  --content-max: 900px;
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  --spacing-3xl: 4rem;
  
  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 400ms ease;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  font-weight: 400;
  line-height: 1.7;
  color: var(--text-primary);
  background: var(--bg-primary);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Background Pattern */
body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: 
    radial-gradient(ellipse 80% 50% at 50% -20%, rgba(74, 158, 255, 0.08), transparent),
    radial-gradient(ellipse 60% 40% at 100% 100%, rgba(201, 162, 39, 0.05), transparent);
  pointer-events: none;
  z-index: -1;
}

/* Layout */
.layout {
  display: flex;
  min-height: 100vh;
}

/* Navigation Sidebar */
.nav-sidebar {
  position: fixed;
  top: 0;
  left: 0;
  width: var(--nav-width);
  height: 100vh;
  background: var(--bg-secondary);
  border-right: 1px solid var(--border-subtle);
  display: flex;
  flex-direction: column;
  z-index: 100;
  overflow: hidden;
}

.nav-header {
  padding: var(--spacing-xl);
  border-bottom: 1px solid var(--border-subtle);
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  text-decoration: none;
  margin-bottom: var(--spacing-md);
}

.nav-logo-icon {
  width: 32px;
  height: 32px;
  background: linear-gradient(135deg, var(--accent-gold), var(--accent-blue));
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 0.75rem;
  color: var(--bg-primary);
}

.nav-logo-text {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-primary);
  letter-spacing: -0.01em;
}

.nav-subtitle {
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.nav-content {
  flex: 1;
  overflow-y: auto;
  padding: var(--spacing-lg) 0;
}

.nav-section {
  margin-bottom: var(--spacing-xl);
}

.nav-section-title {
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  padding: 0 var(--spacing-xl) var(--spacing-sm);
}

.nav-list {
  list-style: none;
}

.nav-item {
  position: relative;
}

.nav-link {
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-md);
  padding: var(--spacing-sm) var(--spacing-xl);
  text-decoration: none;
  color: var(--text-secondary);
  transition: all var(--transition-fast);
  border-left: 2px solid transparent;
}

.nav-link:hover {
  color: var(--text-primary);
  background: var(--accent-blue-dim);
  border-left-color: var(--accent-blue);
}

.nav-link.active {
  color: var(--accent-gold);
  background: var(--accent-gold-dim);
  border-left-color: var(--accent-gold);
}

.nav-link.disabled {
  opacity: 0.4;
  pointer-events: none;
}

.nav-number {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 500;
  color: var(--text-muted);
  min-width: 2.5rem;
  padding-top: 0.15rem;
}

.nav-link.active .nav-number {
  color: var(--accent-gold);
}

.nav-text {
  font-size: 0.875rem;
  line-height: 1.4;
}

.nav-badge {
  font-size: 0.6rem;
  padding: 0.15rem 0.4rem;
  border-radius: 3px;
  background: var(--accent-gold-dim);
  color: var(--accent-gold);
  margin-left: auto;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.nav-badge.coming {
  background: var(--bg-tertiary);
  color: var(--text-muted);
}

.nav-footer {
  padding: var(--spacing-lg) var(--spacing-xl);
  border-top: 1px solid var(--border-subtle);
  font-size: 0.75rem;
  color: var(--text-muted);
}

.nav-footer a {
  color: var(--accent-blue);
  text-decoration: none;
}

.nav-footer a:hover {
  text-decoration: underline;
}

/* Main Content */
.main-content {
  flex: 1;
  margin-left: var(--nav-width);
  min-height: 100vh;
}

.content-wrapper {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: var(--spacing-3xl) var(--spacing-xl);
}

/* Paper Header */
.paper-header {
  margin-bottom: var(--spacing-3xl);
  padding-bottom: var(--spacing-2xl);
  border-bottom: 1px solid var(--border-subtle);
}

.paper-meta {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
  flex-wrap: wrap;
}

.paper-series {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--accent-gold);
  background: var(--accent-gold-dim);
  padding: 0.35rem 0.75rem;
  border-radius: 4px;
  letter-spacing: 0.02em;
}

.paper-vixra {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
}

.paper-vixra a {
  color: var(--accent-blue);
  text-decoration: none;
}

.paper-vixra a:hover {
  text-decoration: underline;
}

.paper-title {
  font-family: var(--font-display);
  font-size: clamp(2rem, 5vw, 2.75rem);
  font-weight: 600;
  line-height: 1.2;
  color: var(--text-primary);
  margin-bottom: var(--spacing-lg);
  letter-spacing: -0.02em;
}

.paper-subtitle {
  font-size: 1.125rem;
  color: var(--text-secondary);
  max-width: 600px;
  line-height: 1.6;
}

.paper-authors {
  margin-top: var(--spacing-xl);
  padding-top: var(--spacing-lg);
  border-top: 1px solid var(--border-subtle);
}

.author-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-lg);
}

.author {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.author-name {
  font-weight: 500;
  color: var(--text-primary);
}

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

/* Actions Bar */
.actions-bar {
  display: flex;
  gap: var(--spacing-md);
  margin-top: var(--spacing-xl);
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: 0.6rem 1.25rem;
  font-family: var(--font-body);
  font-size: 0.875rem;
  font-weight: 500;
  text-decoration: none;
  border-radius: 6px;
  transition: all var(--transition-fast);
  cursor: pointer;
  border: none;
}

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

.btn-primary:hover {
  background: #dbb42e;
  transform: translateY(-1px);
}

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

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

.btn svg {
  width: 16px;
  height: 16px;
}

/* Abstract */
.abstract {
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: 8px;
  padding: var(--spacing-xl);
  margin-bottom: var(--spacing-2xl);
}

.abstract-title {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--accent-gold);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: var(--spacing-md);
}

.abstract-text {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.8;
}

/* Section */
.section {
  margin-bottom: var(--spacing-2xl);
}

.section-title {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--spacing-lg);
  padding-bottom: var(--spacing-sm);
  border-bottom: 1px solid var(--border-subtle);
}

.section-content p {
  margin-bottom: var(--spacing-md);
  color: var(--text-secondary);
}

/* Key Results Grid */
.results-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--spacing-md);
  margin: var(--spacing-xl) 0;
}

.result-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: 8px;
  padding: var(--spacing-lg);
  text-align: center;
  transition: all var(--transition-fast);
}

.result-card:hover {
  border-color: var(--accent-gold);
  transform: translateY(-2px);
}

.result-value {
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--accent-gold);
  margin-bottom: var(--spacing-xs);
}

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

.result-label {
  font-size: 0.8rem;
  color: var(--text-secondary);
  margin-top: var(--spacing-sm);
}

.result-agreement {
  font-size: 0.7rem;
  color: var(--accent-green);
  margin-top: var(--spacing-xs);
}

/* Cross References */
.cross-refs {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-subtle);
  border-radius: 8px;
  padding: var(--spacing-xl);
  margin: var(--spacing-2xl) 0;
}

.cross-refs-title {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: var(--spacing-lg);
}

.cross-refs-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.cross-ref-link {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  padding: var(--spacing-sm) var(--spacing-md);
  background: var(--bg-secondary);
  border-radius: 6px;
  text-decoration: none;
  color: var(--text-secondary);
  transition: all var(--transition-fast);
}

.cross-ref-link:hover {
  background: var(--bg-card);
  color: var(--accent-blue);
}

.cross-ref-number {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
  min-width: 60px;
}

.cross-ref-text {
  font-size: 0.875rem;
}

/* Table of Contents */
.toc {
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: 8px;
  padding: var(--spacing-xl);
  margin: var(--spacing-2xl) 0;
}

.toc-title {
  font-family: var(--font-display);
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--spacing-lg);
}

.toc-list {
  list-style: none;
}

.toc-item {
  padding: var(--spacing-sm) 0;
  border-bottom: 1px solid var(--border-subtle);
}

.toc-item:last-child {
  border-bottom: none;
}

.toc-link {
  display: flex;
  align-items: baseline;
  gap: var(--spacing-md);
  text-decoration: none;
  color: var(--text-secondary);
  transition: color var(--transition-fast);
}

.toc-link:hover {
  color: var(--accent-blue);
}

.toc-number {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
  min-width: 1.5rem;
}

.toc-text {
  font-size: 0.9rem;
}

/* Keywords */
.keywords {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
  margin: var(--spacing-lg) 0;
}

.keyword {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  padding: 0.25rem 0.6rem;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-subtle);
  border-radius: 4px;
  color: var(--text-muted);
}

/* Footer */
.page-footer {
  margin-top: var(--spacing-3xl);
  padding-top: var(--spacing-2xl);
  border-top: 1px solid var(--border-subtle);
}

.footer-nav {
  display: flex;
  justify-content: space-between;
  gap: var(--spacing-lg);
  flex-wrap: wrap;
}

.footer-nav-item {
  flex: 1;
  min-width: 200px;
}

.footer-nav-item.next {
  text-align: right;
}

.footer-nav-label {
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: var(--spacing-sm);
}

.footer-nav-link {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  color: var(--text-primary);
  text-decoration: none;
  font-weight: 500;
  transition: color var(--transition-fast);
}

.footer-nav-link:hover {
  color: var(--accent-gold);
}

.footer-copyright {
  margin-top: var(--spacing-2xl);
  padding-top: var(--spacing-lg);
  border-top: 1px solid var(--border-subtle);
  text-align: center;
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* 404 Page */
.error-page {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: var(--spacing-xl);
}

.error-content {
  text-align: center;
  max-width: 500px;
}

.error-code {
  font-family: var(--font-mono);
  font-size: 8rem;
  font-weight: 700;
  line-height: 1;
  background: linear-gradient(135deg, var(--accent-gold), var(--accent-blue));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: var(--spacing-lg);
}

.error-title {
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--spacing-md);
}

.error-message {
  color: var(--text-secondary);
  margin-bottom: var(--spacing-xl);
  line-height: 1.7;
}

.error-actions {
  display: flex;
  gap: var(--spacing-md);
  justify-content: center;
  flex-wrap: wrap;
}

/* Mobile Navigation Toggle */
.nav-toggle {
  display: none;
  position: fixed;
  top: var(--spacing-md);
  left: var(--spacing-md);
  z-index: 200;
  width: 44px;
  height: 44px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-medium);
  border-radius: 8px;
  cursor: pointer;
  align-items: center;
  justify-content: center;
}

.nav-toggle svg {
  width: 20px;
  height: 20px;
  color: var(--text-primary);
}

/* Responsive */
@media (max-width: 900px) {
  .nav-toggle {
    display: flex;
  }
  
  .nav-sidebar {
    transform: translateX(-100%);
    transition: transform var(--transition-base);
  }
  
  .nav-sidebar.open {
    transform: translateX(0);
  }
  
  .main-content {
    margin-left: 0;
  }
  
  .content-wrapper {
    padding-top: calc(var(--spacing-3xl) + 44px);
  }
}

@media (max-width: 600px) {
  .paper-title {
    font-size: 1.75rem;
  }
  
  .results-grid {
    grid-template-columns: 1fr;
  }
  
  .footer-nav {
    flex-direction: column;
  }
  
  .footer-nav-item.next {
    text-align: left;
  }
}

/* Utility Classes */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* Print Styles */
@media print {
  .nav-sidebar,
  .nav-toggle,
  .actions-bar {
    display: none;
  }
  
  .main-content {
    margin-left: 0;
  }
  
  body {
    background: white;
    color: black;
  }
}