/*
 * Abstract Page Styles
 * Consistent design language for Neurophasia technical reports
 * Dark theme with academic/technical aesthetic
 */

/* ========================================
   Base Reset & Theme
   ======================================== */

:root {
  /* Archive Theme - Rigid, academic (#CDDBCD sage) */
  --color-bg-primary: #0a0c0a;
  --color-bg-secondary: #0f120f;
  --color-bg-tertiary: #151a15;
  --color-bg-elevated: #1b211b;
  --color-surface: #121612;
  --color-surface-hover: #181e18;

  --color-text-primary: #f5f0e8;
  --color-text-secondary: #a8a090;
  --color-text-tertiary: #78725e;
  --color-text-muted: #5a5545;

  --color-accent: #CDDBCD;
  --color-accent-hover: #DDE8DD;
  --color-accent-muted: #A8BCA8;
  --color-accent-subtle: rgba(205, 219, 205, 0.08);

  --color-border: rgba(245, 240, 232, 0.06);
  --color-border-subtle: rgba(245, 240, 232, 0.03);
  --color-border-emphasis: rgba(245, 240, 232, 0.12);

  /* Sharp corners for academic feel */
  --radius-sm: 2px;
  --radius-md: 4px;
  --radius-lg: 6px;
  --radius-xl: 8px;
  --radius-2xl: 12px;
  --radius-nav: 0.5rem;

  /* Typography */
  --font-display: 'Instrument Serif', Georgia, serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;

  /* Transitions */
  --ease-smooth: cubic-bezier(0.4, 0, 0.2, 1);
  --duration-fast: 150ms;
  --duration-base: 250ms;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--color-text-primary);
  background-color: var(--color-bg-primary);
  min-height: 100vh;
}

::selection {
  background-color: var(--color-accent);
  color: white;
}

/* Scrollbar */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: var(--color-bg-secondary);
}

::-webkit-scrollbar-thumb {
  background: var(--color-border-emphasis);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--color-text-muted);
}

/* ========================================
   Navigation
   ======================================== */

.abstract-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(10, 10, 10, 0.9);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--color-border);
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-6);
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  text-decoration: none;
}

.nav-brand-icon {
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-accent);
  color: var(--color-bg-primary);
  font-family: var(--font-display);
  font-size: 1.125rem;
  font-weight: 700;
  border-radius: var(--radius-sm);
}

.nav-brand-text {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text-secondary);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.nav-link {
  padding: var(--space-2) var(--space-4);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  text-decoration: none;
  border-radius: var(--radius-nav);
  transition: all var(--duration-fast) var(--ease-smooth);
}

.nav-link:hover {
  color: var(--color-text-primary);
  background: var(--color-surface);
}

.nav-link.active {
  color: var(--color-accent);
  background: var(--color-accent-subtle);
}

.nav-back {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  text-decoration: none;
  border-radius: var(--radius-md);
  transition: all var(--duration-fast) var(--ease-smooth);
}

.nav-back:hover {
  color: var(--color-accent);
  background: var(--color-accent-subtle);
}

.nav-back svg {
  width: 16px;
  height: 16px;
}

/* Mobile menu */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: var(--space-2);
  background: none;
  border: none;
  cursor: pointer;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-text-primary);
  transition: all var(--duration-base) var(--ease-smooth);
}

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

.abstract-hero {
  position: relative;
  padding: var(--space-16) 0 var(--space-12);
  background: var(--color-bg-secondary);
  border-bottom: 1px solid var(--color-border);
  overflow: hidden;
}

.abstract-hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(205, 219, 205, 0.02) 1px, transparent 1px),
    linear-gradient(90deg, rgba(205, 219, 205, 0.02) 1px, transparent 1px);
  background-size: 40px 40px;
  pointer-events: none;
}

.hero-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-6);
  position: relative;
  z-index: 1;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-1) var(--space-3);
  background: var(--color-accent-subtle);
  border: 1px solid rgba(205, 219, 205, 0.2);
  border-radius: var(--radius-md);
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--color-accent);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-6);
}

.hero-title {
  font-family: var(--font-display);
  font-size: clamp(2.5rem, 5vw, 3.5rem);
  font-weight: 400;
  line-height: 1.1;
  margin-bottom: var(--space-4);
  letter-spacing: -0.02em;
}

.hero-subtitle {
  font-size: 1.125rem;
  color: var(--color-text-secondary);
  line-height: 1.6;
  max-width: 700px;
}

/* ========================================
   Section Navigation (TOC)
   ======================================== */

.section-nav {
  position: sticky;
  top: 64px;
  z-index: 50;
  background: var(--color-bg-primary);
  border-bottom: 1px solid var(--color-border);
  padding: var(--space-4) 0;
  overflow-x: auto;
}

.section-nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-6);
  display: flex;
  gap: var(--space-2);
}

.section-nav-link {
  padding: var(--space-2) var(--space-4);
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  text-decoration: none;
  white-space: nowrap;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: all var(--duration-fast) var(--ease-smooth);
}

.section-nav-link:hover {
  color: var(--color-text-primary);
  border-color: var(--color-accent);
  background: var(--color-accent-subtle);
}

/* ========================================
   Main Content
   ======================================== */

.abstract-main {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--space-12) var(--space-6) var(--space-16);
}

/* ========================================
   Content Sections
   ======================================== */

.content-section {
  margin-bottom: var(--space-16);
  scroll-margin-top: 140px;
}

.section-header {
  margin-bottom: var(--space-8);
}

.section-title {
  font-size: 1.75rem;
  font-weight: 600;
  margin-bottom: var(--space-2);
}

.section-subtitle {
  font-size: 1rem;
  color: var(--color-text-secondary);
  max-width: 700px;
}

/* ========================================
   Cards
   ======================================== */

.content-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-6);
  margin-bottom: var(--space-6);
  transition: all var(--duration-base) var(--ease-smooth);
}

.content-card:hover {
  border-color: var(--color-border-emphasis);
}

.card-title {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: var(--space-4);
  color: var(--color-accent);
}

.card-text {
  color: var(--color-text-secondary);
  line-height: 1.7;
}

.card-text strong {
  color: var(--color-text-primary);
  font-weight: 600;
}

/* Tech Cards Grid */
.tech-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: var(--space-5);
}

.tech-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  transition: all var(--duration-base) var(--ease-smooth);
}

.tech-card:hover {
  border-color: var(--color-accent);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

.tech-card-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-accent);
  margin-bottom: var(--space-2);
}

.tech-card-text {
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

/* ========================================
   Tabs
   ======================================== */

.tabs-container {
  margin-bottom: var(--space-8);
}

.tabs-nav {
  display: inline-flex;
  background: var(--color-bg-tertiary);
  border-radius: var(--radius-lg);
  padding: var(--space-1);
  gap: var(--space-1);
  margin-bottom: var(--space-6);
}

.tab-btn {
  padding: var(--space-3) var(--space-5);
  font-family: var(--font-body);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  background: transparent;
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--duration-fast) var(--ease-smooth);
}

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

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

.tab-content {
  display: none;
}

.tab-content.active {
  display: block;
}

/* ========================================
   Lists
   ======================================== */

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

.content-list li {
  position: relative;
  padding-left: var(--space-6);
  margin-bottom: var(--space-4);
  color: var(--color-text-secondary);
  line-height: 1.6;
}

.content-list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.6em;
  width: 6px;
  height: 6px;
  background: var(--color-accent);
  border-radius: 50%;
}

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

/* ========================================
   Tables
   ======================================== */

.table-wrapper {
  overflow-x: auto;
  margin: var(--space-6) 0;
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9375rem;
}

.data-table th {
  text-align: left;
  padding: var(--space-4);
  background: var(--color-bg-tertiary);
  font-weight: 600;
  color: var(--color-text-primary);
  border-bottom: 1px solid var(--color-border);
}

.data-table td {
  padding: var(--space-4);
  color: var(--color-text-secondary);
  border-bottom: 1px solid var(--color-border);
}

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

.data-table tr:hover td {
  background: var(--color-surface-hover);
}

.data-table .highlight {
  color: var(--color-accent);
  font-weight: 600;
}

/* ========================================
   Charts Container
   ======================================== */

.chart-wrapper {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-6);
  margin: var(--space-6) 0;
}

.chart-title {
  font-size: 1.25rem;
  font-weight: 600;
  text-align: center;
  margin-bottom: var(--space-6);
}

.chart-container {
  position: relative;
  width: 100%;
  max-width: 800px;
  height: 350px;
  margin: 0 auto;
}

/* ========================================
   Pipeline / Process Diagrams
   ======================================== */

.pipeline {
  display: flex;
  flex-wrap: wrap;
  align-items: stretch;
  justify-content: center;
  gap: var(--space-4);
  padding: var(--space-6) 0;
}

.pipeline-step {
  flex: 1;
  min-width: 150px;
  max-width: 200px;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: var(--space-5);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  transition: all var(--duration-base) var(--ease-smooth);
}

.pipeline-step:hover {
  border-color: var(--color-accent);
  background: var(--color-surface-hover);
  transform: translateY(-4px);
}

.pipeline-icon {
  font-size: 2.5rem;
  margin-bottom: var(--space-3);
}

.pipeline-title {
  font-size: 0.9375rem;
  font-weight: 600;
  margin-bottom: var(--space-2);
}

.pipeline-desc {
  font-size: 0.8125rem;
  color: var(--color-text-secondary);
  line-height: 1.5;
}

.pipeline-arrow {
  display: flex;
  align-items: center;
  color: var(--color-text-muted);
  font-size: 1.5rem;
}

/* ========================================
   Info Steps / Filter Pipeline
   ======================================== */

.info-steps {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.info-step {
  padding: var(--space-5);
  background: var(--color-bg-tertiary);
  border-radius: var(--radius-lg);
  border-left: 3px solid var(--color-accent);
}

.info-step-title {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: var(--space-2);
}

.info-step-text {
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
}

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

.abstract-footer {
  background: var(--color-bg-secondary);
  border-top: 1px solid var(--color-border);
  padding: var(--space-6) 0;
  position: relative;
}

.footer-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-6);
  display: flex;
  align-items: center;
  position: relative;
  min-height: 40px;
}

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

/* ========================================
   Responsive
   ======================================== */

@media (max-width: 900px) {
  .tech-grid {
    grid-template-columns: 1fr;
  }

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

  .pipeline-step {
    max-width: 100%;
  }

  .pipeline-arrow {
    transform: rotate(90deg);
    margin: var(--space-2) 0;
  }
}

@media (max-width: 768px) {
  /* Keep nav links visible on article pages (simpler nav) */
  .nav-back {
    font-size: 0.8125rem;
    padding: var(--space-2) var(--space-3);
    min-height: 44px;
  }

  .nav-brand-text {
    display: none;
  }

  .section-nav {
    position: relative;
    top: 0;
  }

  .section-nav-container {
    padding: 0 var(--space-4);
    gap: var(--space-1);
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
    -ms-overflow-style: none;
  }

  .section-nav-container::-webkit-scrollbar {
    display: none;
  }

  .section-nav-link {
    padding: var(--space-2) var(--space-3);
    font-size: 0.75rem;
    min-height: 40px;
    display: flex;
    align-items: center;
  }

  .content-section {
    scroll-margin-top: 80px;
  }

  .hero-title {
    font-size: clamp(2rem, 4vw, 2.5rem);
  }

  .tabs-nav {
    flex-wrap: wrap;
  }

  .tab-btn {
    padding: var(--space-2) var(--space-4);
    min-height: 44px;
  }

  .footer-container {
    justify-content: center;
    text-align: center;
  }
}

@media (max-width: 480px) {
  .nav-container {
    padding: 0 var(--space-4);
  }

  .abstract-hero {
    padding: var(--space-12) 0 var(--space-8);
  }

  .hero-container {
    padding: 0 var(--space-4);
  }

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

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

  .abstract-main {
    padding: var(--space-8) var(--space-4) var(--space-12);
  }

  .content-section {
    margin-bottom: var(--space-10);
  }

  .section-title {
    font-size: 1.375rem;
  }

  .content-card {
    padding: var(--space-4);
    margin-bottom: var(--space-4);
  }

  .card-title {
    font-size: 1.1rem;
  }

  .tech-card {
    padding: var(--space-4);
  }

  .pipeline-step {
    min-width: 100%;
    padding: var(--space-4);
  }

  .pipeline-icon {
    font-size: 2rem;
  }

  .info-step {
    padding: var(--space-4);
  }

  .table-wrapper {
    margin: var(--space-4) 0;
  }

  .data-table th,
  .data-table td {
    padding: var(--space-3);
    font-size: 0.8125rem;
  }

  .chart-wrapper {
    padding: var(--space-4);
  }

  .chart-container {
    height: 280px;
  }

  .footer-container {
    padding: 0 var(--space-4);
  }
}