/* ==========================================================================
   PollikAI | Research Publication Design System
   Inspired by Anthropic, OpenAI Research, and Google DeepMind
   Pure Vanilla CSS | No Frameworks, No Build Step
   ========================================================================== */

:root {
  /* Editorial Palette: Anthropic Warm Obsidian & Bone Ivory */
  --bg-canvas: #0d0e11;
  --bg-surface: #131519;
  --bg-surface-elevated: #1a1c22;
  --bg-surface-subtle: #101115;
  --bg-callout: #16181e;

  /* Hairlines & Borders */
  --border-hairline: rgba(245, 244, 239, 0.07);
  --border-subtle: rgba(245, 244, 239, 0.12);
  --border-strong: rgba(245, 244, 239, 0.24);
  --border-accent: rgba(217, 119, 6, 0.4);

  /* Typography Colors */
  --text-primary: #f5f4ef;
  --text-secondary: #a3a29b;
  --text-muted: #6e6d66;
  --text-code: #e5e4de;
  --text-inverse: #0d0e11;

  /* Accents (Restrained & Scientific) */
  --accent-amber: #d97706;
  --accent-amber-subtle: rgba(217, 119, 6, 0.12);
  --accent-terracotta: #c85a32;
  --accent-green: #22c55e;
  --accent-green-subtle: rgba(34, 197, 94, 0.12);

  /* Font Stacks */
  --font-serif: 'Newsreader', Georgia, 'Times New Roman', serif;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', 'SF Mono', Consolas, Menlo, monospace;

  /* Layout Geometry */
  --container-max: 1200px;
  --radius-xs: 3px;
  --radius-sm: 4px;
  --radius-md: 6px;

  /* Transitions */
  --ease-editorial: cubic-bezier(0.16, 1, 0.3, 1);
  --transition-fast: 0.15s ease;
  --transition-medium: 0.25s var(--ease-editorial);
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 72px;
  background-color: var(--bg-canvas);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  min-height: 100vh;
  position: relative;
  background-color: var(--bg-canvas);
  color: var(--text-primary);
  overflow-x: hidden;
}

/* Subtle editorial paper grain / hairline top border */
body::before {
  content: "";
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, var(--accent-amber), var(--text-primary), var(--accent-terracotta));
  z-index: 1000;
  opacity: 0.8;
}

/* Typography Base Rules */
h1, h2, h3, h4 {
  color: var(--text-primary);
  font-weight: 400;
  text-rendering: optimizeLegibility;
}

p {
  color: var(--text-secondary);
  font-size: 1rem;
  line-height: 1.7;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition-fast);
}

code, pre {
  font-family: var(--font-mono);
}

/* Global Container */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: 32px;
  padding-right: 32px;
}

/* ==========================================================================
   Header & Publication Navigation
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  width: 100%;
  z-index: 200;
  background: rgba(13, 14, 17, 0.94);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-hairline);
  transition: border-color var(--transition-fast);
}

.nav-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
  gap: 32px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  flex-shrink: 0;
}

.brand-symbol {
  font-family: var(--font-serif);
  font-size: 1.4rem;
  font-style: italic;
  color: var(--accent-amber);
  line-height: 1;
}

.brand-title {
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 1.1rem;
  letter-spacing: -0.02em;
  color: var(--text-primary);
}

.desktop-nav {
  display: flex;
  align-items: center;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-link {
  font-family: var(--font-sans);
  font-size: 0.86rem;
  color: var(--text-secondary);
  letter-spacing: -0.01em;
  padding: 6px 0;
  position: relative;
  transition: color var(--transition-fast);
  white-space: nowrap;
}

.nav-link:hover,
.nav-link.active {
  color: var(--text-primary);
}

.nav-link.active::after {
  content: "";
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 100%;
  height: 1px;
  background: var(--text-primary);
}

.header-right {
  display: flex;
  align-items: center;
  gap: 14px;
  flex-shrink: 0;
}

/* Minimalist Custom Language Dropdown (Anthropic / Linear Style) */
.lang-dropdown {
  position: relative;
  display: inline-block;
}

.lang-trigger {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  height: 32px;
  padding: 0 10px 0 9px;
  background: rgba(245, 244, 239, 0.035);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xs);
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  cursor: pointer;
  outline: none;
  transition: all var(--transition-fast);
  user-select: none;
}

.lang-trigger:hover {
  background: rgba(245, 244, 239, 0.07);
  border-color: var(--border-strong);
}

.lang-trigger:focus-visible {
  border-color: var(--accent-amber);
  box-shadow: 0 0 0 2px rgba(217, 119, 6, 0.2);
}

.lang-dropdown.is-open .lang-trigger {
  border-color: var(--accent-amber);
  background: rgba(217, 119, 6, 0.06);
}

.lang-globe-icon {
  color: var(--text-muted);
  flex-shrink: 0;
  transition: color var(--transition-fast);
}

.lang-trigger:hover .lang-globe-icon,
.lang-dropdown.is-open .lang-globe-icon {
  color: var(--accent-amber);
}

.lang-current-code {
  color: var(--text-primary);
  line-height: 1;
}

.lang-chevron {
  color: var(--text-muted);
  flex-shrink: 0;
  transition: transform 0.2s cubic-bezier(0.16, 1, 0.3, 1), color var(--transition-fast);
}

.lang-dropdown.is-open .lang-chevron {
  transform: rotate(180deg);
  color: var(--accent-amber);
}

/* Custom Dropdown Popover Menu */
.lang-popover {
  position: absolute;
  top: calc(100% + 6px);
  right: 0;
  min-width: 136px;
  background: rgba(18, 20, 25, 0.97);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xs);
  padding: 4px;
  box-shadow: 0 16px 36px -4px rgba(0, 0, 0, 0.7), 0 2px 8px rgba(0, 0, 0, 0.4);
  z-index: 500;
  opacity: 0;
  transform: translateY(-4px) scale(0.98);
  pointer-events: none;
  visibility: hidden;
  transition: opacity 0.16s ease, transform 0.16s cubic-bezier(0.16, 1, 0.3, 1), visibility 0.16s;
}

.lang-dropdown.is-open .lang-popover {
  opacity: 1;
  transform: translateY(0) scale(1);
  pointer-events: auto;
  visibility: visible;
}

/* Custom Dropdown Option Item */
.lang-option {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 7px 10px;
  border-radius: 4px;
  cursor: pointer;
  transition: background var(--transition-fast);
  outline: none;
  user-select: none;
}

.lang-option:hover,
.lang-option:focus-visible {
  background: rgba(245, 244, 239, 0.08);
}

.lang-option.active {
  background: rgba(217, 119, 6, 0.08);
}

.lang-opt-main {
  display: flex;
  align-items: center;
  gap: 8px;
}

.lang-opt-code {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: 0.04em;
}

.lang-option.active .lang-opt-code {
  color: var(--accent-amber);
}

.lang-opt-title {
  font-family: var(--font-sans);
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.lang-option.active .lang-opt-title {
  color: var(--text-primary);
  font-weight: 500;
}

.lang-check-icon {
  color: var(--accent-amber);
  opacity: 0;
  flex-shrink: 0;
  transition: opacity var(--transition-fast);
}

.lang-option.active .lang-check-icon {
  opacity: 1;
}

.nav-contact-link {
  font-family: var(--font-sans);
  font-size: 0.84rem;
  font-weight: 500;
  color: var(--text-primary);
  padding: 6px 14px;
  border-radius: var(--radius-xs);
  border: 1px solid var(--border-subtle);
  background: transparent;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.nav-contact-link:hover {
  background: rgba(245, 244, 239, 0.08);
  border-color: var(--text-primary);
}

/* Mobile Toggle */
.mobile-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  flex-direction: column;
  gap: 5px;
}

.toggle-bar {
  display: block;
  width: 20px;
  height: 1.5px;
  background-color: var(--text-primary);
  transition: transform var(--transition-fast);
}

/* ==========================================================================
   Hero Section: Editorial Publication Announcement
   ========================================================================== */
.hero-section {
  padding-top: 56px;
  padding-bottom: 72px;
  border-bottom: 1px solid var(--border-hairline);
  position: relative;
}

.memo-meta-bar {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  padding-bottom: 24px;
  margin-bottom: 32px;
  border-bottom: 1px solid var(--border-hairline);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.05em;
  color: var(--text-muted);
}

.meta-item {
  display: flex;
  align-items: center;
  gap: 6px;
}

.meta-label {
  color: var(--text-muted);
}

.meta-val {
  color: var(--text-secondary);
}

.meta-val.highlight-badge {
  color: var(--accent-amber);
}

.meta-divider {
  color: var(--border-subtle);
}

.hero-content {
  max-width: 980px;
}

.hero-headline {
  font-family: var(--font-serif);
  font-size: clamp(3rem, 5.8vw, 4.8rem);
  font-weight: 400;
  line-height: 1.06;
  letter-spacing: -0.03em;
  color: var(--text-primary);
  margin-bottom: 24px;
}

.hero-subheading {
  display: block;
  font-style: italic;
  font-weight: 400;
  color: var(--text-secondary);
  font-size: clamp(1.6rem, 3.2vw, 2.6rem);
  letter-spacing: -0.01em;
  margin-top: 6px;
}

.hero-abstract {
  font-size: 1.15rem;
  line-height: 1.7;
  color: var(--text-secondary);
  max-width: 820px;
  margin-bottom: 36px;
}

.hero-actions {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 14px;
  margin-bottom: 54px;
}

/* Tactile Buttons (Sharp 4px Radius) */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 22px;
  font-family: var(--font-sans);
  font-size: 0.9rem;
  font-weight: 500;
  border-radius: var(--radius-sm);
  cursor: pointer;
  text-decoration: none;
  transition: all var(--transition-fast);
}

.btn-primary {
  background-color: var(--text-primary);
  color: var(--text-inverse);
  border: 1px solid var(--text-primary);
}

.btn-primary:hover {
  background-color: #ffffff;
  box-shadow: 0 4px 14px rgba(245, 244, 239, 0.12);
}

.btn-arrow {
  display: inline-block;
  transition: transform var(--transition-fast);
}

.btn-primary:hover .btn-arrow {
  transform: translateX(3px);
}

.btn-outline {
  background-color: transparent;
  color: var(--text-primary);
  border: 1px solid var(--border-subtle);
}

.btn-outline:hover {
  border-color: var(--text-primary);
  background: rgba(245, 244, 239, 0.03);
}

.btn-tertiary {
  background-color: transparent;
  color: var(--accent-amber);
  border: 1px solid rgba(217, 119, 6, 0.25);
}

.btn-tertiary:hover {
  border-color: var(--accent-amber);
  background: var(--accent-amber-subtle);
}

/* Academic Data Strip (4-column hairline ledger) */
.research-data-strip {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border-top: 1px solid var(--border-hairline);
  border-bottom: 1px solid var(--border-hairline);
  background: var(--bg-surface);
}

.data-col {
  padding: 24px 24px;
  border-right: 1px solid var(--border-hairline);
}

.data-col:last-child {
  border-right: none;
}

.data-caption {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin-bottom: 8px;
}

.data-number {
  font-family: var(--font-sans);
  font-size: 1.65rem;
  font-weight: 600;
  letter-spacing: -0.03em;
  color: var(--text-primary);
  margin-bottom: 6px;
}

.data-detail {
  font-size: 0.8rem;
  color: var(--text-secondary);
  line-height: 1.4;
}

/* ==========================================================================
   Section Layouts & Editorial Indexing
   ========================================================================== */
.research-section {
  padding-top: 80px;
  padding-bottom: 80px;
  border-bottom: 1px solid var(--border-hairline);
}

.section-intro {
  margin-bottom: 48px;
  max-width: 820px;
}

.section-index {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: var(--accent-amber);
  margin-bottom: 12px;
}

.section-title {
  font-family: var(--font-serif);
  font-size: clamp(2rem, 3.4vw, 2.75rem);
  line-height: 1.15;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  margin-bottom: 14px;
}

.section-lede {
  font-size: 1.08rem;
  color: var(--text-secondary);
  line-height: 1.65;
}

/* ==========================================================================
   Section 01: Two-Column Overview & Scope
   ========================================================================== */
.two-col-layout {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 48px;
  align-items: start;
}

.col-text p {
  margin-bottom: 20px;
}

.col-heading {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  color: var(--text-primary);
  margin-bottom: 18px;
}

.academic-callout-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-hairline);
  padding: 32px;
  border-radius: var(--radius-sm);
}

.card-meta-tag {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.08em;
  color: var(--accent-amber);
  margin-bottom: 12px;
}

.card-meta-tag.alert-tag {
  color: var(--accent-terracotta);
}

.card-subhead {
  font-family: var(--font-sans);
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.card-desc {
  font-size: 0.88rem;
  color: var(--text-secondary);
  margin-bottom: 24px;
}

.scope-ledger {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-bottom: 24px;
}

.ledger-row {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  font-size: 0.88rem;
  line-height: 1.55;
  color: var(--text-secondary);
}

.ledger-row.positive .ledger-marker {
  color: var(--accent-green);
}

.ledger-row.neutral .ledger-marker {
  color: var(--text-muted);
}

.ledger-row strong {
  color: var(--text-primary);
}

.ledger-marker {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.95rem;
  line-height: 1.2;
}

.scope-footnote {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-muted);
  border-top: 1px solid var(--border-hairline);
  padding-top: 16px;
  line-height: 1.6;
}

/* ==========================================================================
   Section 02: Model Specifications Table & Cards
   ========================================================================== */
.table-container {
  overflow-x: auto;
  border: 1px solid var(--border-hairline);
  background: var(--bg-surface);
  border-radius: var(--radius-sm);
  margin-bottom: 40px;
}

.specs-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.88rem;
}

.specs-table th {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  background: var(--bg-surface-subtle);
  padding: 16px 20px;
  border-bottom: 1px solid var(--border-hairline);
}

.specs-table td {
  padding: 14px 20px;
  border-bottom: 1px solid var(--border-hairline);
  vertical-align: top;
  line-height: 1.5;
}

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

.specs-table tr:hover td {
  background: rgba(245, 244, 239, 0.02);
}

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

.spec-val-primary {
  font-family: var(--font-mono);
  font-weight: 600;
  color: var(--text-primary);
}

.spec-annotation {
  color: var(--text-secondary);
  font-size: 0.84rem;
}

/* Highlights Grid */
.highlights-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.highlight-box {
  background: var(--bg-surface);
  border: 1px solid var(--border-hairline);
  padding: 24px;
  border-radius: var(--radius-sm);
  transition: border-color var(--transition-fast);
}

.highlight-box:hover {
  border-color: var(--border-subtle);
}

.box-num {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent-amber);
  margin-bottom: 12px;
}

.box-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.box-text {
  font-size: 0.84rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ==========================================================================
   Section 03: Figure 1.0 (Academic Loss Plot)
   ========================================================================== */
.academic-figure-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-sm);
  padding: 32px;
  margin-bottom: 32px;
}

.figure-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--border-hairline);
  margin-bottom: 24px;
}

.figure-id {
  display: flex;
  align-items: center;
  gap: 10px;
}

.fig-tag {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  font-weight: 700;
  color: var(--text-primary);
  background: var(--bg-surface-elevated);
  padding: 4px 8px;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xs);
}

.fig-title {
  font-family: var(--font-serif);
  font-size: 1.15rem;
  color: var(--text-primary);
}

.figure-legend {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-secondary);
}

.legend-swatch {
  display: inline-block;
  width: 18px;
  height: 2px;
  background: var(--text-primary);
}

.legend-dot {
  display: inline-block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent-amber);
  margin-left: 10px;
}

.chart-canvas-wrapper {
  position: relative;
  width: 100%;
  height: 380px;
  background: var(--bg-canvas);
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-xs);
}

.academic-canvas {
  width: 100%;
  height: 100%;
  display: block;
}

.paper-tooltip {
  position: absolute;
  pointer-events: none;
  opacity: 0;
  transform: translate(-50%, -120%);
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-strong);
  padding: 8px 12px;
  border-radius: var(--radius-xs);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  line-height: 1.45;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.6);
  transition: opacity 0.12s ease;
  z-index: 10;
  white-space: nowrap;
}

.figure-caption {
  font-size: 0.88rem;
  line-height: 1.65;
  color: var(--text-secondary);
  padding-top: 18px;
  border-top: 1px solid var(--border-hairline);
  margin-top: 24px;
}

.figure-caption strong {
  color: var(--text-primary);
}

.milestones-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin-top: 24px;
  padding-top: 20px;
  border-top: 1px solid var(--border-hairline);
}

.milestone-cell {
  padding: 12px 14px;
  background: var(--bg-surface-subtle);
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-xs);
}

.milestone-cell.highlight {
  border-color: rgba(217, 119, 6, 0.4);
  background: rgba(217, 119, 6, 0.05);
}

.m-label {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  margin-bottom: 4px;
}

.m-val {
  display: block;
  font-family: var(--font-mono);
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 2px;
}

.milestone-cell.highlight .m-val {
  color: var(--accent-amber);
}

.m-note {
  display: block;
  font-size: 0.75rem;
  color: var(--text-secondary);
}

.observations-box {
  background: var(--bg-surface);
  border: 1px solid var(--border-hairline);
  padding: 24px;
  border-radius: var(--radius-sm);
}

.obs-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 8px;
}

/* ==========================================================================
   Section 04: Decoder Block Topology & Code Card
   ========================================================================== */
.topology-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 32px;
}

.diagram-card, .code-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-sm);
  padding: 28px;
}

.diagram-heading {
  font-family: var(--font-serif);
  font-size: 1.35rem;
  color: var(--text-primary);
  margin-bottom: 24px;
}

.flow-stack {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.flow-node {
  background: var(--bg-surface-subtle);
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-xs);
  padding: 12px 16px;
}

.node-meta {
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.08em;
  color: var(--accent-amber);
  margin-bottom: 2px;
}

.node-name {
  font-size: 0.88rem;
  color: var(--text-primary);
  font-family: var(--font-mono);
}

.flow-arrow {
  text-align: center;
  color: var(--text-muted);
  font-size: 0.85rem;
  line-height: 1;
}

.flow-block {
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xs);
  padding: 16px;
}

.block-title {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 10px;
}

.block-body {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.sub-step {
  font-size: 0.8rem;
  color: var(--text-secondary);
  font-family: var(--font-mono);
  line-height: 1.45;
}

.code-card-header {
  display: flex;
  align-items: center;
  justify-content: flex-start;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--border-hairline);
  margin-bottom: 18px;
}

.file-name {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-primary);
  font-weight: 600;
}

.code-block {
  overflow-x: auto;
  font-size: 0.8rem;
  line-height: 1.6;
  color: var(--text-code);
}

/* Subtle Editorial Syntax Highlighting */
.code-block .kw { color: #f59e0b; }
.code-block .cls { color: #f5f4ef; font-weight: 600; }
.code-block .str { color: #34d399; }
.code-block .num { color: #60a5fa; }
.code-block .cmt { color: #72716b; font-style: italic; }
.code-block .dec { color: #c85a32; }
.code-block .typ { color: #93c5fd; }

/* ==========================================================================
   Section 05: Hardware Infrastructure & Constraints
   ========================================================================== */
.infra-single-wrap {
  max-width: 820px;
  margin: 0 auto;
}

.infra-spec-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-sm);
  padding: 36px 40px;
}

.infra-card-title {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  color: var(--text-primary);
  margin-bottom: 12px;
}

.infra-card-desc {
  font-size: 0.92rem;
  color: var(--text-secondary);
  margin-bottom: 24px;
  line-height: 1.65;
}

.specs-mini-table {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.mini-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border-hairline);
  font-size: 0.86rem;
}

.mini-key {
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: 0.78rem;
}

.mini-val {
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-weight: 500;
}

.mini-val.highlight-val {
  color: var(--accent-amber);
  font-weight: 700;
}



/* ==========================================================================
   Section 06: Compute Scaling Calculator
   ========================================================================== */
.calculator-panel {
  background: var(--bg-surface);
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-sm);
  padding: 36px;
}

.calc-top-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 20px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--border-hairline);
  margin-bottom: 32px;
}

.calc-heading {
  font-family: var(--font-serif);
  font-size: 1.45rem;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.calc-sub {
  font-size: 0.88rem;
  color: var(--text-secondary);
}

.token-selector {
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--bg-surface-subtle);
  padding: 4px;
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-xs);
}

.token-btn {
  background: transparent;
  border: none;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-secondary);
  padding: 8px 16px;
  border-radius: var(--radius-xs);
  cursor: pointer;
  transition: all var(--transition-fast);
}

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

.token-btn.active {
  background: var(--bg-surface-elevated);
  color: var(--text-primary);
  border: 1px solid var(--border-subtle);
}

.benchmark-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-bottom: 36px;
}

.bench-card {
  background: var(--bg-canvas);
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-sm);
  padding: 24px;
}

.bench-card.cloud-card {
  border-color: rgba(217, 119, 6, 0.3);
  background: rgba(217, 119, 6, 0.02);
}

.bench-card.enterprise-card {
  border-color: rgba(34, 197, 94, 0.3);
  background: rgba(34, 197, 94, 0.02);
}

.bench-tier {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin-bottom: 8px;
}

.bench-name {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.bench-speed {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-secondary);
  margin-bottom: 18px;
}

.bench-duration {
  font-family: var(--font-sans);
  font-size: 2.2rem;
  font-weight: 600;
  letter-spacing: -0.03em;
  color: var(--text-primary);
  line-height: 1.1;
  margin-bottom: 6px;
}

.bench-duration.highlight-cloud {
  color: var(--accent-amber);
}

.bench-duration.highlight-enterprise {
  color: var(--accent-green);
}

.bench-ratio {
  font-size: 0.8rem;
  color: var(--text-secondary);
  margin-bottom: 16px;
}

.bench-bar-track {
  width: 100%;
  height: 4px;
  background: var(--bg-surface-elevated);
  border-radius: 2px;
  overflow: hidden;
}

.bench-bar-fill {
  height: 100%;
  transition: width 0.4s var(--ease-editorial);
}

.fill-workstation { background: var(--text-muted); }
.fill-cloud { background: var(--accent-amber); }
.fill-enterprise { background: var(--accent-green); }

.impact-ledger {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  padding-top: 28px;
  border-top: 1px solid var(--border-hairline);
}

.impact-col {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  font-size: 0.86rem;
  color: var(--text-secondary);
  line-height: 1.55;
}

.impact-col strong {
  color: var(--text-primary);
}

.impact-icon-wrap {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border-radius: var(--radius-xs);
  background: var(--bg-surface-subtle);
  border: 1px solid var(--border-hairline);
  color: var(--accent-amber);
  flex-shrink: 0;
}

/* ==========================================================================
   Section 07: Contact & Sponsorship
   ========================================================================== */
.contact-card-academic {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 40px;
  background: var(--bg-surface);
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-sm);
  padding: 40px;
}

.contact-headline {
  font-family: var(--font-serif);
  font-size: 1.65rem;
  color: var(--text-primary);
  margin-bottom: 12px;
}

.contact-p {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.65;
  margin-bottom: 24px;
}

.email-display-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--bg-canvas);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xs);
  padding: 14px 18px;
  margin-bottom: 24px;
}

.email-label {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin-bottom: 2px;
}

.email-text {
  font-family: var(--font-mono);
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
  text-decoration: none;
}

.copy-email-button {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  padding: 6px 12px;
  border-radius: var(--radius-xs);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.copy-email-button:hover {
  background: rgba(245, 244, 239, 0.08);
  border-color: var(--text-primary);
}

.programs-supported {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.prog-tag {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-secondary);
  background: var(--bg-surface-subtle);
  border: 1px solid var(--border-hairline);
  padding: 4px 10px;
  border-radius: var(--radius-xs);
}

.contact-offerings {
  border-left: 1px solid var(--border-hairline);
  padding-left: 40px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.offerings-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 18px;
}

.offerings-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-bottom: 28px;
}

.offerings-list li {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  font-size: 0.86rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

.offering-num {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent-amber);
}

.contact-action-box .btn.full-width {
  width: 100%;
}

/* ==========================================================================
   Footer & Mandatory Notice
   ========================================================================== */
.site-footer {
  padding-top: 64px;
  padding-bottom: 48px;
  background: var(--bg-surface-subtle);
  border-top: 1px solid var(--border-hairline);
}

.footer-colophon {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 32px;
  margin-bottom: 36px;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 8px;
}

.footer-tagline {
  font-size: 0.88rem;
  color: var(--text-secondary);
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  list-style: none;
}

.footer-links a {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-secondary);
}

.footer-links a:hover {
  color: var(--text-primary);
}

.footer-notice-box {
  background: var(--bg-surface);
  border: 1px solid var(--border-hairline);
  padding: 14px 20px;
  border-radius: var(--radius-xs);
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-bottom: 28px;
}

.footer-notice-box strong {
  color: var(--text-secondary);
}

.footer-legal-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-muted);
  padding-top: 20px;
  border-top: 1px solid var(--border-hairline);
}

/* ==========================================================================
   Responsive Adaptations
   ========================================================================== */
@media (max-width: 1024px) {
  .research-data-strip {
    grid-template-columns: repeat(2, 1fr);
  }

  .data-col:nth-child(2) {
    border-right: none;
  }

  .data-col:nth-child(1),
  .data-col:nth-child(2) {
    border-bottom: 1px solid var(--border-hairline);
  }

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

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

  .contact-card-academic {
    grid-template-columns: 1fr;
  }

  .contact-offerings {
    border-left: none;
    border-top: 1px solid var(--border-hairline);
    padding-left: 0;
    padding-top: 32px;
  }
}

@media (max-width: 960px) {
  .desktop-nav {
    display: none;
  }

  .mobile-toggle {
    display: flex;
  }

  .nav-links.mobile-open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 64px;
    left: 0;
    width: 100%;
    background: var(--bg-surface);
    border-bottom: 1px solid var(--border-subtle);
    padding: 24px;
    gap: 16px;
    z-index: 500;
  }
}

@media (max-width: 768px) {

  .two-col-layout {
    grid-template-columns: 1fr;
  }

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

  .impact-ledger {
    grid-template-columns: 1fr;
  }

  .milestones-row {
    grid-template-columns: repeat(2, 1fr);
  }

  .hero-headline {
    font-size: 2.8rem;
  }

  .hero-subheading {
    font-size: 1.6rem;
  }
}

@media (max-width: 560px) {
  .header-right .nav-contact-link {
    display: none;
  }
}

@media (max-width: 480px) {
  .container {
    padding-left: 20px;
    padding-right: 20px;
  }

  .research-data-strip {
    grid-template-columns: 1fr;
  }

  .data-col {
    border-right: none;
    border-bottom: 1px solid var(--border-hairline);
  }

  .data-col:last-child {
    border-bottom: none;
  }

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

  .milestones-row {
    grid-template-columns: 1fr;
  }

  .token-selector {
    width: 100%;
    justify-content: space-between;
  }

  .token-btn {
    padding: 6px 10px;
    font-size: 0.7rem;
  }
}