/* ==========================================================================
   Mite Chess Engine — Design System & Stylesheet
   Editorial, restrained technical aesthetic inspired by professional chess
   interfaces, developer documentation, and precision software engineering.
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. Design Tokens
   -------------------------------------------------------------------------- */
:root {
  /* Surfaces & Backgrounds */
  --bg-canvas: #fbfbf9;
  --bg-surface: #ffffff;
  --bg-surface-raised: #f6f5f0;
  --bg-surface-subtle: #f0eee7;
  --bg-surface-inset: #e8e6dd;

  /* Text & Content */
  --text-primary: #18191a;
  --text-secondary: #4d5156;
  --text-muted: #71767d;
  --text-subtle: #969ba3;

  /* Editorial Accents */
  --accent-forest: #205036;
  --accent-forest-hover: #163a26;
  --accent-forest-subtle: #eef5f1;
  --accent-forest-border: #b8d4c3;

  --accent-wood: #8c5a2b;
  --accent-wood-subtle: #f9f4ee;
  --accent-wood-border: #dfcfbf;

  /* Metric Tones */
  --tone-win: #205036;
  --tone-win-bg: #edf6f1;
  --tone-draw: #7a6730;
  --tone-draw-bg: #f9f5ea;
  --tone-loss: #8a3030;
  --tone-loss-bg: #faeeee;

  /* Borders & Lines */
  --border-subtle: #eceae2;
  --border-default: #dbd8ce;
  --border-strong: #b5b1a3;
  --border-dark: #222324;

  /* Typography Stacks */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --font-mono: 'JetBrains Mono', 'SF Mono', 'Fira Code', Menlo, Monaco, Consolas, monospace;

  /* Spacing Scale */
  --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;
  --space-20: 5rem;
  --space-24: 6rem;

  /* Layout */
  --max-width-content: 1160px;
  --max-width-wide: 1280px;
  --header-height: 64px;
  --announcement-bar-height: 38px;
  --radius-xs: 2px;
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 220ms ease;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  overflow-x: clip;
}

body {
  background-color: var(--bg-canvas);
  color: var(--text-primary);
  font-family: var(--font-sans);
  line-height: 1.6;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  min-height: 100vh;
  width: 100%;
  max-width: 100%;
  overflow-x: clip;
  display: flex;
  flex-direction: column;
}

main {
  flex: 1 1 auto;
  width: 100%;
  max-width: 100%;
  min-width: 0;
}

body.body-locked {
  overflow: hidden;
}

img, svg {
  display: block;
  max-width: 100%;
}

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

button {
  font-family: inherit;
  background: none;
  border: none;
  cursor: pointer;
}

code, kbd, samp, pre {
  font-family: var(--font-mono);
  font-size: 0.9em;
}

.font-mono {
  font-family: var(--font-mono);
}

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

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

/* Accessible focus ring */
:focus-visible {
  outline: 2px solid var(--accent-forest);
  outline-offset: 2px;
}

/* --------------------------------------------------------------------------
   3. Layout Containers
   -------------------------------------------------------------------------- */
.container {
  width: 100%;
  max-width: var(--max-width-content);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--space-6);
  padding-right: var(--space-6);
}

.container-wide {
  width: 100%;
  max-width: var(--max-width-wide);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--space-6);
  padding-right: var(--space-6);
}

.section {
  padding-top: var(--space-20);
  padding-bottom: var(--space-20);
  border-bottom: 1px solid var(--border-subtle);
}

.section-header {
  margin-bottom: var(--space-12);
}

.section-eyebrow {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent-forest);
  margin-bottom: var(--space-3);
}

.section-title {
  font-size: clamp(1.75rem, 3vw, 2.375rem);
  font-weight: 600;
  letter-spacing: -0.025em;
  line-height: 1.25;
  color: var(--text-primary);
  margin-bottom: var(--space-4);
}

.section-desc {
  font-size: 1.125rem;
  color: var(--text-secondary);
  max-width: 68ch;
  line-height: 1.6;
}

/* --------------------------------------------------------------------------
   3.5 Announcement Bar
   -------------------------------------------------------------------------- */
html.announcement-dismissed-session {
  --announcement-bar-height: 0px !important;
}

html.announcement-dismissed-session #announcementBar {
  display: none !important;
}

.announcement-bar {
  position: sticky;
  top: 0;
  left: 0;
  right: 0;
  width: 100%;
  max-width: 100vw;
  z-index: 105;
  background-color: #205036 !important;
  background: #205036 !important;
  color: #ffffff !important;
  border-bottom: 1px solid rgba(0, 0, 0, 0.15);
  overflow: hidden;
  max-height: 140px;
  opacity: 1;
  box-sizing: border-box;
  transition: max-height 0.35s cubic-bezier(0.16, 1, 0.3, 1),
              opacity 0.25s ease,
              padding 0.35s cubic-bezier(0.16, 1, 0.3, 1),
              border-color 0.25s ease;
}

.announcement-bar.is-dismissing {
  max-height: 0 !important;
  opacity: 0 !important;
  padding-top: 0 !important;
  padding-bottom: 0 !important;
  border-bottom-color: transparent !important;
  pointer-events: none;
}

.announcement-bar.is-hidden {
  display: none !important;
}

.announcement-container {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: var(--announcement-bar-height);
  padding-top: 6px;
  padding-bottom: 6px;
  padding-left: var(--space-6);
  padding-right: var(--space-6);
  position: relative;
  background-color: transparent !important;
  box-sizing: border-box;
  width: 100%;
  max-width: var(--max-width-wide);
}

.announcement-content {
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  font-size: 0.8125rem;
  font-weight: 500;
  line-height: 1.4;
  color: #ffffff;
  padding-right: var(--space-8);
  padding-left: var(--space-2);
}

.announcement-emoji {
  margin-right: 0.4rem;
  font-size: 0.95em;
  line-height: 1;
  display: inline-block;
  flex-shrink: 0;
}

.announcement-text {
  color: #ffffff;
}

.announcement-link {
  color: #ffffff;
  font-weight: 600;
  text-decoration: underline;
  text-decoration-color: rgba(255, 255, 255, 0.65);
  text-underline-offset: 3px;
  transition: text-decoration-color var(--transition-fast), opacity var(--transition-fast);
}

.announcement-link:hover,
.announcement-link:focus-visible {
  text-decoration-color: #ffffff;
  opacity: 0.95;
}

.announcement-close {
  position: absolute;
  right: var(--space-4);
  top: 50%;
  transform: translateY(-50%);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  padding: 0;
  border-radius: var(--radius-sm);
  color: rgba(255, 255, 255, 0.85);
  background: transparent;
  border: none;
  cursor: pointer;
  transition: background-color var(--transition-fast), color var(--transition-fast), transform var(--transition-fast);
}

.announcement-close:hover {
  color: #ffffff;
  background-color: rgba(255, 255, 255, 0.16);
}

.announcement-close:active {
  transform: translateY(-50%) scale(0.92);
}

.announcement-close:focus-visible {
  outline: 2px solid #ffffff;
  outline-offset: 1px;
}

/* --------------------------------------------------------------------------
   4. Sticky Header & Navigation
   -------------------------------------------------------------------------- */
.site-header {
  position: sticky;
  top: var(--announcement-bar-height, 0px);
  z-index: 100;
  height: var(--header-height);
  background-color: rgba(251, 251, 249, 0.94);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid transparent;
  transition: top 0.35s cubic-bezier(0.16, 1, 0.3, 1),
              border-color var(--transition-fast),
              background-color var(--transition-fast);
}

.site-header.header-scrolled {
  border-bottom-color: var(--border-default);
  background-color: rgba(251, 251, 249, 0.98);
}

.header-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.brand-link {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
}

.brand-logo-img {
  height: 32px;
  width: auto;
  object-fit: contain;
  display: block;
  filter: drop-shadow(0 1px 2px rgba(0, 0, 0, 0.08));
  transition: transform 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

.brand-link:hover .brand-logo-img {
  transform: translateY(-1px) scale(1.04);
}



.spec-panel-header-left {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.spec-logo-img {
  height: 20px;
  width: auto;
  object-fit: contain;
  display: block;
}

.brand-name {
  font-weight: 700;
  font-size: 1.25rem;
  letter-spacing: -0.03em;
  color: var(--text-primary);
}

.brand-version {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 600;
  color: var(--accent-forest);
  background-color: var(--accent-forest-subtle);
  border: 1px solid var(--accent-forest-border);
  padding: 1px 5px;
  border-radius: var(--radius-xs);
}

.main-nav {
  display: flex;
  align-items: center;
  gap: var(--space-8);
}

.nav-links {
  display: flex;
  align-items: center;
  list-style: none;
  gap: var(--space-6);
}

.nav-link {
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--text-secondary);
  padding: var(--space-2) 0;
  position: relative;
  transition: color var(--transition-fast);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background-color: var(--accent-forest);
  transform: scaleX(0);
  transform-origin: center;
  transition: transform 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

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

.nav-link:hover::after,
.nav-link.active::after {
  transform: scaleX(1);
}

.nav-link.active {
  color: var(--accent-forest);
  font-weight: 600;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

/* Button system */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: 0.5rem 0.875rem;
  font-size: 0.875rem;
  font-weight: 500;
  border-radius: var(--radius-sm);
  text-decoration: none;
  transition: background-color 0.15s ease, border-color 0.15s ease, color 0.15s ease, transform 0.18s cubic-bezier(0.16, 1, 0.3, 1), box-shadow 0.18s ease;
  white-space: nowrap;
}

.btn:hover {
  transform: translateY(-1.5px);
  box-shadow: 0 3px 8px rgba(0, 0, 0, 0.05);
}

.btn:active {
  transform: translateY(0);
  box-shadow: none;
}

.btn-sm {
  padding: 0.375rem 0.625rem;
  font-size: 0.8125rem;
}

.btn-primary {
  background-color: var(--accent-forest);
  color: #ffffff;
  border: 1px solid var(--accent-forest);
}

.btn-primary:hover {
  background-color: var(--accent-forest-hover);
  border-color: var(--accent-forest-hover);
  color: #ffffff;
}

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

.btn-secondary:hover {
  background-color: var(--bg-surface-raised);
  border-color: var(--border-strong);
}

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

.btn-outline:hover {
  background-color: var(--bg-surface-subtle);
  border-color: var(--border-strong);
}

.mobile-nav-toggle {
  display: none;
  padding: var(--space-2);
  color: var(--text-primary);
}

.nav-backdrop {
  display: none;
}

/* --------------------------------------------------------------------------
   5. Hero Section
   -------------------------------------------------------------------------- */
.hero-section {
  padding-top: var(--space-16);
  padding-bottom: var(--space-16);
  border-bottom: 1px solid var(--border-subtle);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: var(--space-12);
  align-items: center;
}

.hero-eyebrow {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent-forest);
  margin-bottom: var(--space-4);
}

.hero-headline {
  font-size: clamp(2.5rem, 5vw, 3.75rem);
  font-weight: 700;
  letter-spacing: -0.035em;
  line-height: 1.1;
  color: var(--text-primary);
  margin-bottom: var(--space-5);
}

.hero-description {
  font-size: 1.1875rem;
  color: var(--text-secondary);
  line-height: 1.6;
  max-width: 54ch;
  margin-bottom: var(--space-8);
}

.hero-cta-group {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin-bottom: var(--space-10);
}

.hero-cta-group .btn {
  padding: 0.6875rem 1.25rem;
  font-size: 0.9375rem;
}

/* Technical Specification Bar in Hero */
.hero-tech-strip {
  border-top: 1px solid var(--border-default);
  padding-top: var(--space-5);
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-4);
}

.tech-strip-item {
  display: flex;
  flex-direction: column;
}

.tech-strip-label {
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 2px;
}

.tech-strip-value {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-primary);
}

/* --------------------------------------------------------------------------
   Hero Visual: Precision Chessboard
   -------------------------------------------------------------------------- */
.hero-board-wrapper {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-sm);
  padding: var(--space-5);
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.board-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--border-subtle);
  padding-bottom: var(--space-3);
}

.board-title {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.board-eval-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--accent-forest);
  background-color: var(--accent-forest-subtle);
  border: 1px solid var(--accent-forest-border);
  padding: 2px 7px;
  border-radius: var(--radius-xs);
}

.eval-pulse-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--accent-forest);
  flex-shrink: 0;
  box-shadow: 0 0 0 0 rgba(32, 80, 54, 0.45);
  animation: eval-pulse 2.6s infinite ease-out;
}

@keyframes eval-pulse {
  0% {
    box-shadow: 0 0 0 0 rgba(32, 80, 54, 0.45);
  }
  65% {
    box-shadow: 0 0 0 5px rgba(32, 80, 54, 0);
  }
  100% {
    box-shadow: 0 0 0 0 rgba(32, 80, 54, 0);
  }
}

.chessboard-container {
  position: relative;
  width: 100%;
  aspect-ratio: 1 / 1;
  border: 1px solid var(--border-strong);
  background-color: #2b2b2b;
  user-select: none;
}

.chessboard-grid {
  display: grid;
  grid-template-columns: repeat(8, 1fr);
  grid-template-rows: repeat(8, 1fr);
  width: 100%;
  height: 100%;
}

.board-square {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  outline: none;
  transition: background-color 0.14s ease, box-shadow 0.14s ease;
}

/* Board Colors: Hugging Face tournament green & buff */
.square-light {
  background-color: #eeeed2;
}

.square-dark {
  background-color: #486a2f;
}

.board-square.square-highlighted {
  box-shadow: inset 0 0 0 2px #d4a340;
}

.square-light.square-highlighted {
  background-color: #e4e4bc;
}

.square-dark.square-highlighted {
  background-color: #557d38;
}

.rank-label, .file-label {
  position: absolute;
  font-family: var(--font-mono);
  font-size: 0.5625rem;
  font-weight: 700;
  pointer-events: none;
  opacity: 0.75;
  z-index: 2;
}

.rank-label {
  top: 2px;
  left: 3px;
}

.file-label {
  bottom: 2px;
  right: 3px;
}

.square-light .rank-label, .square-light .file-label {
  color: #486a2f;
}

.square-dark .rank-label, .square-dark .file-label {
  color: #eeeed2;
}

.piece-img {
  width: 86%;
  height: 86%;
  object-fit: contain;
  pointer-events: none;
  z-index: 1;
  transition: transform 0.18s cubic-bezier(0.16, 1, 0.3, 1), filter 0.18s ease;
  filter: drop-shadow(0 1px 2px rgba(0, 0, 0, 0.2));
}

.board-square:hover .piece-img {
  transform: scale(1.06) translateY(-1.5px);
  filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.25));
}

.board-square.square-highlighted .piece-img {
  transform: scale(1.08) translateY(-2px);
  filter: drop-shadow(0 3px 6px rgba(0, 0, 0, 0.28));
}

.board-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-top: 1px solid var(--border-subtle);
  padding-top: var(--space-3);
  font-size: 0.75rem;
  color: var(--text-muted);
}

.board-inspect-status {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.badge-square {
  font-weight: 700;
  color: var(--text-primary);
  background-color: var(--bg-surface-subtle);
  padding: 1px 4px;
  border-radius: var(--radius-xs);
  border: 1px solid var(--border-default);
  animation: badgePop 0.16s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes badgePop {
  0% { transform: scale(0.92); opacity: 0.7; }
  100% { transform: scale(1); opacity: 1; }
}

.badge-piece {
  font-weight: 500;
  color: var(--text-secondary);
}

/* --------------------------------------------------------------------------
   6. Overview Section (Two-Column Editorial + Spec Panel)
   -------------------------------------------------------------------------- */
.overview-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: var(--space-12);
}

.editorial-body {
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
  font-size: 1.0625rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

.editorial-body p strong {
  color: var(--text-primary);
}

.callout-quote {
  border-left: 3px solid var(--accent-forest);
  padding-left: var(--space-5);
  font-style: italic;
  color: var(--text-primary);
  margin: var(--space-4) 0;
}

/* Specification Panel */
.spec-panel {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.spec-panel-header {
  background-color: var(--bg-surface-raised);
  border-bottom: 1px solid var(--border-default);
  padding: var(--space-4) var(--space-5);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.spec-panel-title {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-primary);
}

.spec-list {
  display: flex;
  flex-direction: column;
}

.spec-item {
  display: grid;
  grid-template-columns: 140px 1fr;
  padding: var(--space-3) var(--space-5);
  border-bottom: 1px solid var(--border-subtle);
  font-size: 0.875rem;
  align-items: baseline;
}

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

.spec-key {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.spec-val {
  color: var(--text-primary);
  line-height: 1.5;
}

.spec-val-mono {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
}

/* --------------------------------------------------------------------------
   7. Features Section (Varied Layout)
   -------------------------------------------------------------------------- */
.features-container {
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
}

.feature-featured {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-sm);
  padding: var(--space-8);
  display: grid;
  grid-template-columns: 1.3fr 1fr;
  gap: var(--space-8);
  align-items: center;
}

.feature-featured-content {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.feature-icon-badge {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  background-color: var(--accent-forest-subtle);
  border: 1px solid var(--accent-forest-border);
  color: var(--accent-forest);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-2);
  transition: transform 0.2s cubic-bezier(0.16, 1, 0.3, 1), border-color 0.2s ease;
}

.feature-title {
  font-size: 1.25rem;
  font-weight: 600;
  letter-spacing: -0.015em;
  color: var(--text-primary);
}

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

.feature-tech-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
  background-color: var(--bg-surface-raised);
  padding: 2px 6px;
  border-radius: var(--radius-xs);
  border: 1px solid var(--border-subtle);
  align-self: flex-start;
}

.feature-code-preview {
  background-color: var(--bg-surface-inset);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-xs);
  padding: var(--space-4);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  line-height: 1.5;
  color: var(--text-primary);
  overflow-x: auto;
}

/* Secondary Feature Grid */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-6);
}

.feature-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-sm);
  padding: var(--space-6);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  transition: border-color 0.2s ease, box-shadow 0.2s ease, transform 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

.feature-card:hover {
  border-color: var(--border-strong);
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.04);
  transform: translateY(-2px);
}

.feature-card:hover .feature-icon-badge {
  transform: translateY(-1px);
  border-color: var(--accent-forest);
}

/* --------------------------------------------------------------------------
   8. Benchmarks Section (Engineering Report)
   -------------------------------------------------------------------------- */
/* Disclaimer Alert Banner / Notice Box */
.benchmark-disclaimer-banner {
  background-color: #205036 !important;
  background: linear-gradient(135deg, #1b432e 0%, #22563a 100%) !important;
  border: 1px solid #2d6b49 !important;
  border-left: 5px solid #4ade80 !important;
  padding: var(--space-4) var(--space-5);
  border-radius: var(--radius-xs);
  margin-bottom: var(--space-8);
  display: flex;
  align-items: flex-start;
  gap: var(--space-4);
  color: #ffffff !important;
  box-shadow: 0 4px 16px rgba(18, 48, 30, 0.16);
}

.disclaimer-icon {
  color: #4ade80 !important;
  flex-shrink: 0;
  margin-top: 2px;
}

.disclaimer-text {
  font-size: 0.875rem;
  color: rgba(255, 255, 255, 0.94) !important;
  line-height: 1.55;
}

.disclaimer-text strong {
  color: #ffffff !important;
  font-weight: 600;
}

.disclaimer-text em {
  color: #bbf7d0 !important;
  font-style: italic;
}

.disclaimer-text a {
  color: #86efac !important;
  text-decoration: underline;
}

/* Key Highlights Row */
.benchmark-kpi-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-4);
  margin-bottom: var(--space-10);
}

.kpi-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-sm);
  padding: var(--space-5);
  display: flex;
  flex-direction: column;
  transition: border-color 0.2s ease, box-shadow 0.2s ease, transform 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

.kpi-card:hover {
  border-color: var(--border-strong);
  box-shadow: 0 3px 10px rgba(0, 0, 0, 0.03);
  transform: translateY(-1px);
}

.kpi-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-2);
}

.kpi-value {
  font-family: var(--font-mono);
  font-size: 1.875rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--text-primary);
  margin-bottom: var(--space-1);
}

.kpi-value.kpi-accent {
  color: var(--accent-forest);
}

.kpi-subtext {
  font-size: 0.8125rem;
  color: var(--text-muted);
}

/* Benchmark Charts Grid */
.charts-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-6);
  margin-bottom: var(--space-10);
}

.chart-panel {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-sm);
  padding: var(--space-5);
  display: flex;
  flex-direction: column;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.chart-panel:hover {
  border-color: var(--border-strong);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.03);
}

.chart-header {
  display: flex;
  flex-direction: column;
  gap: 2px;
  margin-bottom: var(--space-4);
  border-bottom: 1px solid var(--border-subtle);
  padding-bottom: var(--space-3);
}

.chart-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
}

.chart-subtitle {
  font-size: 0.8125rem;
  color: var(--text-muted);
}

.chart-canvas-wrapper {
  position: relative;
  width: 100%;
  min-height: 280px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.native-svg-chart {
  width: 100%;
  height: auto;
  overflow: visible;
}

/* SVG Chart Subtle Micro-Animations */
.chart-bar-group {
  cursor: default;
}

.chart-bar-group rect[fill^="url"] {
  transition: opacity 0.18s ease, filter 0.18s ease;
}

.chart-bar-group:hover rect[fill^="url"] {
  filter: brightness(1.08);
}

.chart-point {
  cursor: pointer;
}

.chart-point circle {
  transition: r 0.2s cubic-bezier(0.16, 1, 0.3, 1), stroke-width 0.2s ease;
}

.chart-point:hover circle,
.chart-point:focus circle {
  r: 6.5;
  stroke-width: 3.5px;
}

.chart-point text {
  transition: font-weight 0.15s ease, transform 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

.chart-point:hover text,
.chart-point:focus text {
  font-weight: 700;
  transform: translateY(-1px);
}

/* Empty State */
.chart-empty-state, .table-empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: var(--space-8);
  color: var(--text-muted);
  gap: var(--space-2);
}

.empty-state-title {
  font-weight: 600;
  color: var(--text-primary);
  font-size: 0.9375rem;
}

.empty-state-desc {
  font-size: 0.8125rem;
  max-width: 44ch;
}

/* Table Controller & Filter Bar */
.benchmark-table-controls {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-4);
  margin-bottom: var(--space-4);
}

.filter-pills {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex-wrap: wrap;
}

.benchmark-filter-btn {
  font-family: var(--font-sans);
  font-size: 0.8125rem;
  font-weight: 500;
  padding: 0.375rem 0.75rem;
  border: 1px solid var(--border-default);
  background-color: var(--bg-surface);
  color: var(--text-secondary);
  border-radius: var(--radius-xs);
  transition: background-color 0.15s ease, border-color 0.15s ease, color 0.15s ease, transform 0.15s cubic-bezier(0.16, 1, 0.3, 1);
}

.benchmark-filter-btn:hover {
  background-color: var(--bg-surface-raised);
  color: var(--text-primary);
  transform: translateY(-1px);
}

.benchmark-filter-btn:active {
  transform: translateY(0);
}

.benchmark-filter-btn.active {
  background-color: var(--accent-forest);
  color: #ffffff;
  border-color: var(--accent-forest);
  font-weight: 600;
}

.table-results-counter {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
}

.table-responsive-wrapper {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-sm);
  width: 100%;
  max-width: 100%;
  min-width: 0;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  display: block;
  scrollbar-width: thin;
  scrollbar-color: var(--border-strong) transparent;
  position: relative;
}

.table-responsive-wrapper::-webkit-scrollbar {
  height: 6px;
}

.table-responsive-wrapper::-webkit-scrollbar-track {
  background: transparent;
}

.table-responsive-wrapper::-webkit-scrollbar-thumb {
  background: var(--border-strong);
  border-radius: 3px;
}

.table-responsive-wrapper .benchmark-table {
  min-width: 600px;
}

.benchmark-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.875rem;
  text-align: left;
}

.benchmark-table th {
  background-color: var(--bg-surface-raised);
  padding: var(--space-3) var(--space-4);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-bottom: 1px solid var(--border-default);
  white-space: nowrap;
  user-select: none;
}

.benchmark-table th[data-sort] {
  cursor: pointer;
}

.benchmark-table th[data-sort]:hover {
  color: var(--text-primary);
  background-color: var(--bg-surface-subtle);
}

.benchmark-table th[data-sort]::after {
  content: ' ↕';
  font-size: 0.8em;
  opacity: 0.4;
}

.benchmark-table th.sort-asc::after {
  content: ' ↑';
  opacity: 1;
  color: var(--accent-forest);
}

.benchmark-table th.sort-desc::after {
  content: ' ↓';
  opacity: 1;
  color: var(--accent-forest);
}

.benchmark-table td {
  padding: var(--space-3) var(--space-4);
  border-bottom: 1px solid var(--border-subtle);
  vertical-align: middle;
}

.benchmark-table tbody tr {
  transition: background-color 0.14s ease;
}

.benchmark-table tbody tr:hover {
  background-color: var(--bg-surface-raised);
}

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

.cell-numeric {
  text-align: right;
  font-variant-numeric: tabular-nums;
}

.cell-opponent .opponent-name {
  font-weight: 600;
  color: var(--text-primary);
}

.cell-opponent .opponent-spec {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
}

.cell-tc {
  white-space: nowrap;
}

.tc-code {
  font-size: 0.8125rem;
  font-weight: 600;
}

.tc-cat-badge {
  display: block;
  font-size: 0.6875rem;
  color: var(--text-muted);
}

.cell-win {
  color: var(--tone-win);
  font-weight: 600;
}

.cell-draw {
  color: var(--tone-draw);
}

.cell-loss {
  color: var(--tone-loss);
}

.score-display {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  justify-content: flex-end;
}

.score-pct {
  font-weight: 700;
  color: var(--accent-forest);
}

.score-bar-track {
  width: 50px;
  height: 6px;
  background-color: var(--bg-surface-inset);
  border-radius: 3px;
  overflow: hidden;
}

.score-bar-fill {
  height: 100%;
  background-color: var(--accent-forest);
}

.cell-color-splits {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.color-split-row {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  font-size: 0.75rem;
}

.color-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  display: inline-block;
}

.white-dot {
  background-color: #f0eee7;
  border: 1px solid #71767d;
}

.black-dot {
  background-color: #18191a;
}

.pgn-link {
  display: inline-flex;
  align-items: center;
  gap: 3px;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 600;
  color: var(--accent-forest);
  border: 1px solid var(--accent-forest-border);
  background-color: var(--accent-forest-subtle);
  padding: 2px 5px;
  border-radius: var(--radius-xs);
}

.pgn-link:hover {
  background-color: var(--accent-forest);
  color: #ffffff;
}

/* Formula explanation note below table */
.table-footnote {
  margin-top: var(--space-3);
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.8125rem;
  color: var(--text-muted);
  flex-wrap: wrap;
  gap: var(--space-2);
}

/* --------------------------------------------------------------------------
   9. Downloads / Get Mite Section
   -------------------------------------------------------------------------- */
.downloads-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-6);
}

.download-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-sm);
  padding: var(--space-6);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: var(--space-6);
  transition: border-color 0.2s ease, box-shadow 0.2s ease, transform 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

.download-card:hover {
  border-color: var(--border-strong);
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.04);
  transform: translateY(-2px);
}

.download-card-featured {
  border-color: var(--accent-forest);
  box-shadow: 0 0 0 1px var(--accent-forest);
}

.download-card-header {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.download-badge {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 2px 6px;
  border-radius: var(--radius-xs);
  align-self: flex-start;
}

.badge-featured {
  background-color: var(--accent-forest-subtle);
  color: var(--accent-forest);
  border: 1px solid var(--accent-forest-border);
}

.badge-standard {
  background-color: var(--bg-surface-raised);
  color: var(--text-muted);
  border: 1px solid var(--border-default);
}

.download-card-title {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-primary);
}

.download-card-desc {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

.download-meta-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  border-top: 1px solid var(--border-subtle);
  padding-top: var(--space-3);
  font-size: 0.8125rem;
}

.meta-row {
  display: flex;
  justify-content: space-between;
}

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

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

/* --------------------------------------------------------------------------
   10. How to Play Section (Tabbed Walkthrough)
   -------------------------------------------------------------------------- */
.how-to-play-layout {
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: var(--space-8);
  background-color: var(--bg-surface);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-sm);
  padding: var(--space-6);
}

.tab-nav {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  border-right: 1px solid var(--border-subtle);
  padding-right: var(--space-6);
}

.tab-btn {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  border-radius: var(--radius-xs);
  text-align: left;
  transition: all var(--transition-fast);
}

.tab-btn:hover {
  background-color: var(--bg-surface-raised);
  color: var(--text-primary);
}

.tab-btn.active {
  background-color: var(--accent-forest-subtle);
  color: var(--accent-forest);
  font-weight: 600;
}

.tab-panels {
  min-width: 0;
}

.tab-panel {
  display: none;
}

.tab-panel.active {
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
  animation: tabFadeIn 0.22s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes tabFadeIn {
  from {
    opacity: 0;
    transform: translateY(4px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.guide-step-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.guide-step {
  display: flex;
  gap: var(--space-3);
  font-size: 0.9375rem;
  color: var(--text-secondary);
}

.step-num {
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--accent-forest);
  flex-shrink: 0;
}

/* Code Snippet Box with Copy Button */
.code-block-container {
  background-color: var(--bg-surface-inset);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-xs);
  overflow: hidden;
}

.code-block-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background-color: var(--bg-surface-subtle);
  padding: var(--space-2) var(--space-4);
  border-bottom: 1px solid var(--border-default);
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  color: var(--text-muted);
  text-transform: uppercase;
}

.copy-btn {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 2px 6px;
  font-size: 0.6875rem;
  color: var(--text-secondary);
  background-color: var(--bg-surface);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-xs);
  transition: all 0.15s ease, transform 0.15s cubic-bezier(0.16, 1, 0.3, 1);
}

.copy-btn:hover {
  color: var(--text-primary);
  border-color: var(--border-strong);
  transform: translateY(-1px);
}

.copy-btn:active {
  transform: translateY(0);
}

.copy-btn.copied {
  color: var(--accent-forest);
  border-color: var(--accent-forest-border);
  background-color: var(--accent-forest-subtle);
  transform: scale(1.02);
}

.code-pre {
  padding: var(--space-4);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  line-height: 1.5;
  color: var(--text-primary);
  overflow-x: auto;
}

/* --------------------------------------------------------------------------
   11. About the Developer Section
   -------------------------------------------------------------------------- */
.about-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-sm);
  padding: var(--space-8);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-8);
  align-items: center;
}

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

.developer-name {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
}

.developer-role {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--accent-forest);
}

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

.about-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin-top: var(--space-2);
}

.about-meta-panel {
  background-color: var(--bg-surface-raised);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-xs);
  padding: var(--space-5);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.about-meta-title {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  color: var(--text-muted);
  letter-spacing: 0.05em;
}

/* --------------------------------------------------------------------------
   12. Footer
   -------------------------------------------------------------------------- */
.site-footer {
  background-color: var(--bg-surface-raised);
  border-top: 1px solid var(--border-default);
  padding-top: var(--space-16);
  padding-bottom: var(--space-12);
  margin-top: auto;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--space-8);
  margin-bottom: var(--space-12);
}

.footer-brand-col {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  max-width: 38ch;
}

.footer-brand-desc {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.footer-col-title {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-primary);
  margin-bottom: var(--space-4);
}

.footer-link-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

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

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

.footer-bottom {
  border-top: 1px solid var(--border-default);
  padding-top: var(--space-6);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-4);
  font-size: 0.8125rem;
  color: var(--text-muted);
}

.footer-tech-badge {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-secondary);
  background-color: var(--bg-surface);
  border: 1px solid var(--border-default);
  padding: 3px 8px;
  border-radius: var(--radius-xs);
}

/* --------------------------------------------------------------------------
   13. Responsive Breakpoints
   -------------------------------------------------------------------------- */
@media (max-width: 1024px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: var(--space-10);
  }

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

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

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

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

  .how-to-play-layout {
    grid-template-columns: 1fr;
  }

  .tab-nav {
    flex-direction: row;
    flex-wrap: wrap;
    border-right: none;
    border-bottom: 1px solid var(--border-subtle);
    padding-right: 0;
    padding-bottom: var(--space-4);
  }

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

@media (max-width: 768px) {
  .main-nav {
    display: none;
  }

  .main-nav.nav-open {
    display: flex;
    flex-direction: column;
    position: fixed;
    top: calc(var(--header-height) + var(--announcement-bar-height, 0px));
    left: 0;
    right: 0;
    background-color: var(--bg-surface);
    border-bottom: 1px solid var(--border-default);
    padding: var(--space-6);
    gap: var(--space-6);
    box-shadow: 0 8px 24px rgba(0,0,0,0.08);
    transition: top 0.35s cubic-bezier(0.16, 1, 0.3, 1);
  }

  .nav-links {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-4);
    width: 100%;
  }

  .nav-link {
    font-size: 1.125rem;
    width: 100%;
    padding: var(--space-2) 0;
  }

  .mobile-nav-toggle {
    display: block;
  }

  .nav-backdrop.backdrop-active {
    display: block;
    position: fixed;
    top: calc(var(--header-height) + var(--announcement-bar-height, 0px));
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.4);
    z-index: 90;
    transition: top 0.35s cubic-bezier(0.16, 1, 0.3, 1);
  }

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

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

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

  .feature-featured {
    grid-template-columns: 1fr;
  }

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

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

  .spec-item {
    grid-template-columns: 1fr;
    gap: 4px;
  }
}

@media (max-width: 480px) {
  .hero-tech-strip {
    grid-template-columns: 1fr;
  }

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

  .hero-headline {
    font-size: 2.125rem;
  }

  .hero-cta-group {
    flex-direction: column;
    width: 100%;
  }

  .hero-cta-group .btn {
    width: 100%;
  }

  .board-footer {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-2);
  }

  .announcement-bar {
    background-color: #205036 !important;
    background: #205036 !important;
  }

  .announcement-container {
    padding-left: var(--space-3);
    padding-right: 36px;
    padding-top: 8px;
    padding-bottom: 8px;
    background: transparent !important;
  }

  .announcement-content {
    font-size: 0.75rem;
    padding-right: 0;
    padding-left: 0;
    text-align: left;
    justify-content: flex-start;
    line-height: 1.35;
    color: #ffffff !important;
  }

  .announcement-close {
    right: 8px;
    top: 50%;
    transform: translateY(-50%);
  }
}

/* --------------------------------------------------------------------------
   14. Subtle Reveal Animations
   -------------------------------------------------------------------------- */
.reveal-fade {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 0.45s cubic-bezier(0.16, 1, 0.3, 1), transform 0.45s cubic-bezier(0.16, 1, 0.3, 1);
  will-change: opacity, transform;
}

.reveal-fade.revealed {
  opacity: 1;
  transform: translateY(0);
}

.reveal-delay-1 { transition-delay: 70ms; }
.reveal-delay-2 { transition-delay: 140ms; }
.reveal-delay-3 { transition-delay: 210ms; }
.reveal-delay-4 { transition-delay: 280ms; }
.reveal-delay-5 { transition-delay: 350ms; }

/* --------------------------------------------------------------------------
   15. Reduced Motion Support
   -------------------------------------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }

  .reveal-fade {
    opacity: 1 !important;
    transform: none !important;
    transition: none !important;
  }

  .eval-pulse-dot,
  .badge-square,
  .tab-panel.active {
    animation: none !important;
  }

  .btn:hover,
  .feature-card:hover,
  .download-card:hover,
  .kpi-card:hover,
  .benchmark-filter-btn:hover,
  .copy-btn:hover,
  .brand-link:hover .brand-logo-img,
  .board-square:hover .piece-img,
  .board-square.square-highlighted .piece-img,
  .chart-point:hover circle,
  .chart-point:focus circle,
  .chart-point:hover text,
  .chart-point:focus text {
    transform: none !important;
  }
}

/* --------------------------------------------------------------------------
   15. Benchmark Report Page Specific Styles
   -------------------------------------------------------------------------- */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--text-muted);
  margin-bottom: var(--space-4);
}

.breadcrumb a {
  color: var(--accent-forest);
  text-decoration: none;
  font-weight: 500;
}

.breadcrumb a:hover {
  text-decoration: underline;
}

.breadcrumb-sep {
  color: var(--text-subtle);
  user-select: none;
}

.report-hero {
  padding-top: var(--space-12);
  padding-bottom: var(--space-12);
  background-color: var(--bg-surface);
  border-bottom: 1px solid var(--border-subtle);
}

.report-hero-headline {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.15;
  color: var(--text-primary);
  margin-bottom: var(--space-4);
}

.report-hero-desc {
  font-size: 1.125rem;
  color: var(--text-secondary);
  line-height: 1.6;
  max-width: 72ch;
  margin-bottom: var(--space-6);
}

.report-meta-strip {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-3);
}

.report-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  padding: 5px 12px;
  border-radius: var(--radius-xs);
  background-color: var(--bg-surface-raised);
  border: 1px solid var(--border-default);
  color: var(--text-secondary);
}

.report-badge-accent {
  background-color: var(--accent-forest-subtle);
  border-color: var(--accent-forest-border);
  color: var(--accent-forest);
}

.opponent-section {
  margin-top: var(--space-12);
  margin-bottom: var(--space-12);
}

.opponent-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-direction: column;
  gap: var(--space-3);
  margin-bottom: var(--space-4);
  padding-bottom: var(--space-3);
  border-bottom: 1px solid var(--border-subtle);
}

@media (min-width: 769px) {
  .opponent-header {
    flex-direction: row;
    align-items: flex-end;
  }
}

.opponent-title-group {
  display: flex;
  flex-direction: column;
  gap: 4px;
  max-width: 100%;
}

.opponent-title {
  font-size: clamp(1.125rem, 4vw, 1.375rem);
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-2) var(--space-3);
  word-break: break-word;
}

.opponent-meta {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
  word-break: break-word;
  line-height: 1.5;
}

.opponent-quick-stats {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-3);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
}

.raw-pgn-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 260px), 1fr));
  gap: var(--space-4);
}

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

.quick-stat-val {
  font-weight: 700;
  color: var(--text-primary);
}

.quick-stat-val.val-win {
  color: var(--tone-win);
}

.benchmark-table tfoot td {
  background-color: var(--bg-surface-raised);
  font-weight: 700;
  border-top: 2px solid var(--border-strong);
  color: var(--text-primary);
}

.opponent-analysis-callout {
  background-color: var(--bg-surface-raised);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-xs);
  padding: var(--space-4) var(--space-5);
  margin-top: var(--space-4);
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.55;
}

.opponent-analysis-callout strong {
  color: var(--text-primary);
}

.methodology-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-6);
  margin-top: var(--space-6);
  margin-bottom: var(--space-8);
}

.methodology-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-sm);
  padding: var(--space-5);
  display: flex;
  flex-direction: column;
  transition: border-color var(--transition-fast);
}

.methodology-card:hover {
  border-color: var(--border-strong);
}

.methodology-card-title {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--space-2);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.methodology-card-desc {
  font-size: 0.8125rem;
  color: var(--text-secondary);
  line-height: 1.55;
}

.methodology-card-list {
  list-style: none;
  margin-top: var(--space-3);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  font-size: 0.8125rem;
  color: var(--text-secondary);
}

.methodology-card-list li {
  position: relative;
  padding-left: var(--space-4);
}

.methodology-card-list li::before {
  content: '•';
  position: absolute;
  left: 0;
  color: var(--accent-forest);
}

.limitations-box {
  background-color: var(--bg-surface-raised);
  border: 1px solid var(--border-default);
  border-left: 4px solid var(--accent-wood);
  padding: var(--space-6);
  border-radius: var(--radius-xs);
  margin-top: var(--space-8);
}

.limitations-title {
  font-size: 1.0625rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--space-3);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.limitations-content {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.limitations-content p {
  margin-bottom: var(--space-3);
}

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

.section-anchor-nav {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-top: var(--space-6);
  margin-bottom: var(--space-8);
  padding: var(--space-3);
  background-color: var(--bg-surface);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-xs);
}

.section-anchor-btn {
  font-family: var(--font-sans);
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--text-secondary);
  padding: 4px 10px;
  border-radius: var(--radius-xs);
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

.section-anchor-btn:hover {
  background-color: var(--bg-surface-raised);
  color: var(--text-primary);
}

@media (max-width: 1024px) {
  .methodology-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  /* Prevent invisible blank void on mobile */
  .reveal-fade {
    opacity: 1 !important;
    transform: none !important;
  }

  .container,
  .container-wide {
    padding-left: var(--space-4);
    padding-right: var(--space-4);
  }

  .section {
    padding-top: var(--space-10);
    padding-bottom: var(--space-10);
  }

  .section-header {
    margin-bottom: var(--space-6);
  }

  .report-hero {
    padding-top: var(--space-8);
    padding-bottom: var(--space-8);
  }

  .report-hero-headline {
    font-size: 1.875rem;
  }

  .report-hero-desc {
    font-size: 0.9375rem;
    line-height: 1.5;
  }

  .report-meta-strip {
    gap: var(--space-2);
  }

  .report-badge {
    font-size: 0.6875rem;
    padding: 4px 8px;
  }

  /* Horizontally swipeable anchor shortcuts on mobile */
  .section-anchor-nav {
    flex-wrap: nowrap;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    padding: var(--space-2) var(--space-3);
    margin-top: var(--space-4);
    margin-bottom: var(--space-6);
    scrollbar-width: none;
    -ms-overflow-style: none;
    gap: var(--space-2);
  }

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

  .section-anchor-btn {
    white-space: nowrap;
    flex-shrink: 0;
    font-size: 0.75rem;
    padding: 4px 8px;
  }

  .benchmark-kpi-grid {
    grid-template-columns: 1fr;
    gap: var(--space-3);
  }

  .kpi-card {
    padding: var(--space-4);
    min-width: 0;
  }

  .kpi-value {
    font-size: 1.625rem;
  }

  .kpi-subtext {
    font-size: 0.75rem;
  }

  .benchmark-table th,
  .benchmark-table td {
    padding: 8px 10px;
    font-size: 0.75rem;
  }

  .benchmark-disclaimer-banner {
    padding: var(--space-3) var(--space-4);
    gap: var(--space-3);
  }

  .disclaimer-text {
    font-size: 0.8125rem;
    line-height: 1.5;
  }

  .methodology-grid {
    grid-template-columns: 1fr;
    gap: var(--space-4);
  }

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

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

  .opponent-header {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-2);
  }

  .opponent-title {
    font-size: 1.125rem;
  }

  .opponent-meta {
    font-size: 0.6875rem;
    line-height: 1.4;
  }

  .opponent-quick-stats {
    font-size: 0.75rem;
    gap: var(--space-2);
  }

  .opponent-analysis-callout {
    padding: var(--space-3) var(--space-4);
    font-size: 0.8125rem;
    line-height: 1.5;
  }

  .limitations-box {
    padding: var(--space-4);
    margin-top: var(--space-6);
  }

  .filter-pills {
    gap: var(--space-1);
    width: 100%;
  }

  .benchmark-filter-btn {
    font-size: 0.6875rem;
    padding: 4px 8px;
  }

  .table-results-counter {
    font-size: 0.6875rem;
    width: 100%;
  }

  .table-footnote {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-2);
    font-size: 0.75rem;
  }
}

@media (max-width: 480px) {
  .container,
  .container-wide {
    padding-left: var(--space-3);
    padding-right: var(--space-3);
  }

  .section {
    padding-top: var(--space-8);
    padding-bottom: var(--space-8);
  }

  .report-hero {
    padding-top: var(--space-6);
    padding-bottom: var(--space-6);
  }

  .report-hero-headline {
    font-size: 1.625rem;
  }

  .raw-pgn-grid {
    grid-template-columns: 1fr;
  }
}