:root {
  --bg-board: #111215;
  --bg-surface: #181a1f;
  --bg-surface-elevated: #22252c;
  --border-color: #2e333d;
  --border-stencil: #3d4452;
  --text-main: #f0f2f5;
  --text-muted: #9ba3b0;
  --signal-orange: #ff5500;
  --signal-orange-glow: rgba(255, 85, 0, 0.15);
  --signal-amber: #e67e22;
  --tag-bg: #272c35;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --radius: 0px;
}

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

body {
  background-color: var(--bg-board);
  color: var(--text-main);
  font-family: var(--font-sans);
  line-height: 1.6;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

/* Stencil Utility & Typography */
.stencil-text {
  font-family: var(--font-mono);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.stencil-badge {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  padding: 4px 10px;
  background-color: var(--signal-orange);
  color: #000;
  margin-bottom: 12px;
}

.stencil-badge-muted {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 3px 8px;
  background-color: var(--tag-bg);
  color: var(--text-muted);
  border: 1px solid var(--border-color);
}

a {
  color: var(--text-main);
  text-decoration: underline;
  text-decoration-color: var(--signal-orange);
  text-underline-offset: 4px;
}

a:hover, a:focus {
  color: var(--signal-orange);
}

/* Top Plate Header */
.stencil-header {
  background-color: var(--bg-surface);
  border-bottom: 2px solid var(--signal-orange);
  padding: 14px 24px;
  position: relative;
  z-index: 10;
}

.stencil-header-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
}

.brand-mark {
  font-family: var(--font-mono);
  font-weight: 900;
  font-size: 18px;
  letter-spacing: 0.05em;
  color: #fff;
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 8px;
}

.brand-mark .brand-dot {
  width: 10px;
  height: 10px;
  background-color: var(--signal-orange);
  display: inline-block;
}

.topic-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 20px;
}

.topic-nav a {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--text-muted);
  text-decoration: none;
  padding: 4px 6px;
  border-bottom: 1px solid transparent;
  transition: color 0.15s ease, border-color 0.15s ease;
}

.topic-nav a:hover, .topic-nav a:focus {
  color: #fff;
  border-color: var(--signal-orange);
}

/* Layout Container */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* Stencil Hero Section */
.hero-section {
  padding: 48px 0;
  border-bottom: 1px solid var(--border-color);
  background: linear-gradient(180deg, var(--bg-surface) 0%, var(--bg-board) 100%);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 40px;
  align-items: center;
}

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

.hero-headline {
  font-size: clamp(28px, 4vw, 44px);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin-bottom: 18px;
}

.hero-lead {
  font-size: 18px;
  color: var(--text-muted);
  line-height: 1.5;
  margin-bottom: 24px;
}

.hero-disclaimer-box {
  background-color: var(--bg-surface-elevated);
  border-left: 3px solid var(--signal-orange);
  padding: 16px;
  font-size: 14px;
  color: var(--text-muted);
  margin-top: 20px;
}

.hero-image-wrapper {
  position: relative;
  border: 1px solid var(--border-stencil);
  background-color: #000;
  box-shadow: 0 10px 30px rgba(0,0,0,0.5);
}

.hero-image-wrapper img {
  width: 100%;
  height: auto;
  display: block;
}

.hero-image-caption {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-muted);
  padding: 8px 12px;
  background-color: var(--bg-surface);
  border-top: 1px solid var(--border-color);
}

/* Content Sections */
.content-section {
  padding: 56px 0;
  border-bottom: 1px solid var(--border-color);
}

.section-label {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--signal-orange);
  margin-bottom: 8px;
  display: block;
}

.section-title {
  font-size: 28px;
  font-weight: 800;
  letter-spacing: -0.01em;
  margin-bottom: 20px;
}

.section-intro {
  font-size: 17px;
  color: var(--text-muted);
  max-width: 800px;
  margin-bottom: 36px;
}

/* Criteria Testboard Grid */
.criteria-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 24px;
}

.board-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  padding: 24px;
  display: flex;
  flex-direction: column;
  position: relative;
}

.board-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background-color: var(--border-stencil);
}

.board-card:hover::before {
  background-color: var(--signal-orange);
}

.card-num {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--signal-orange);
  margin-bottom: 12px;
  font-weight: 700;
}

.card-title {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 12px;
}

.card-body {
  color: var(--text-muted);
  font-size: 15px;
  line-height: 1.55;
  flex-grow: 1;
}

.card-checklist {
  list-style: none;
  margin-top: 16px;
  padding-top: 14px;
  border-top: 1px dashed var(--border-color);
  font-size: 13px;
  color: var(--text-main);
}

.card-checklist li {
  margin-bottom: 6px;
  position: relative;
  padding-left: 18px;
}

.card-checklist li::before {
  content: "■";
  position: absolute;
  left: 0;
  font-size: 9px;
  color: var(--signal-orange);
  top: 2px;
}

/* Tables for Data & Comparison */
.table-wrapper {
  overflow-x: auto;
  margin: 24px 0;
  border: 1px solid var(--border-color);
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 14px;
}

.data-table th, .data-table td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--border-color);
}

.data-table th {
  background-color: var(--bg-surface-elevated);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--text-main);
  border-bottom: 2px solid var(--signal-orange);
}

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

/* Information Gain Section: Calculator */
#information-gain {
  background-color: #14171d;
  border: 2px solid var(--signal-orange);
  padding: 40px;
  margin: 40px 0;
  box-shadow: 0 0 30px var(--signal-orange-glow);
}

.calc-header {
  margin-bottom: 28px;
}

.calc-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
}

@media (max-width: 800px) {
  .calc-grid {
    grid-template-columns: minmax(0, 1fr);
  }
}

.calc-grid > * {
  min-width: 0;
  width: 100%;
}

.calc-label {
  overflow-wrap: anywhere;
}

.calc-form-group {
  margin-bottom: 18px;
}

.calc-label {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  margin-bottom: 6px;
  color: var(--text-main);
}

.calc-input {
  width: 100%;
  background-color: var(--bg-surface);
  border: 1px solid var(--border-stencil);
  color: #fff;
  padding: 10px 14px;
  font-family: var(--font-mono);
  font-size: 16px;
  border-radius: var(--radius);
}

.calc-input:focus {
  outline: none;
  border-color: var(--signal-orange);
  background-color: #000;
}

.calc-helper {
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 4px;
}

.preset-strip {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 12px;
}

.preset-btn {
  background-color: var(--bg-surface-elevated);
  border: 1px solid var(--border-color);
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: 11px;
  padding: 6px 12px;
  cursor: pointer;
}

.preset-btn:hover {
  background-color: var(--signal-orange);
  color: #000;
  border-color: var(--signal-orange);
}

.calc-results-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  padding: 24px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.calc-metric-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-bottom: 20px;
}

.calc-metric-box {
  background-color: var(--bg-board);
  padding: 16px;
  border-left: 2px solid var(--signal-orange);
}

.calc-metric-val {
  font-family: var(--font-mono);
  font-size: 26px;
  font-weight: 800;
  color: #fff;
  line-height: 1.1;
}

.calc-metric-sub {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-muted);
  margin-top: 4px;
  text-transform: uppercase;
}

.calc-status {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--signal-orange);
  margin-top: 14px;
}

/* Editorial / Authority Callout */
.method-box {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  padding: 28px;
  margin: 32px 0;
}

.method-box h3 {
  font-size: 20px;
  margin-bottom: 12px;
}

/* FAQ Accordion / Cards */
.faq-grid {
  display: grid;
  gap: 16px;
}

.faq-item {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  padding: 20px;
}

.faq-item h3 {
  font-size: 17px;
  margin-bottom: 8px;
  color: #fff;
}

.faq-item p {
  color: var(--text-muted);
  font-size: 15px;
}

/* Footer & Legal */
.stencil-footer {
  background-color: var(--bg-surface);
  border-top: 2px solid var(--signal-orange);
  padding: 48px 0 32px 0;
  margin-top: 64px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 32px;
  margin-bottom: 36px;
}

@media (max-width: 768px) {
  .footer-grid {
    grid-template-columns: 1fr;
  }
}

.footer-col h4 {
  font-family: var(--font-mono);
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 14px;
  color: #fff;
}

.footer-col p {
  color: var(--text-muted);
  font-size: 14px;
  line-height: 1.6;
}

.footer-links {
  list-style: none;
}

.footer-links li {
  margin-bottom: 8px;
}

.footer-links a {
  font-size: 14px;
  color: var(--text-muted);
  text-decoration: none;
}

.footer-links a:hover {
  color: var(--signal-orange);
}

.footer-bottom {
  border-top: 1px solid var(--border-color);
  padding-top: 20px;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  font-size: 13px;
  color: var(--text-muted);
}

/* Legal Pages Styling */
.legal-main {
  max-width: 800px;
  margin: 40px auto;
  padding: 0 24px;
}

.legal-main h1 {
  font-size: 32px;
  font-weight: 800;
  margin: 20px 0 16px 0;
  border-bottom: 2px solid var(--signal-orange);
  padding-bottom: 12px;
}

.legal-main h2 {
  font-size: 20px;
  margin: 28px 0 12px 0;
}

.legal-main p, .legal-main ul {
  font-size: 15px;
  color: var(--text-muted);
  margin-bottom: 16px;
}

.legal-main ul {
  padding-left: 20px;
}

.legal-main a {
  color: var(--signal-orange);
}

.back-link {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--text-muted);
  text-decoration: none;
  display: inline-block;
  margin-bottom: 16px;
}

@media (max-width: 600px) {
  .stencil-header { padding: 14px 16px; }
  .stencil-header-inner { align-items: flex-start; }
  .brand-mark { width: 100%; font-size: 17px; }
  .topic-nav { width: 100%; display: grid; grid-template-columns: 1fr 1fr; gap: 4px 10px; }
  .topic-nav a { min-height: 42px; display: flex; align-items: center; font-size: 12px; line-height: 1.3; }
  .stencil-badge, .stencil-badge-muted, .hero-image-caption, .section-label, .card-num, .calc-label, .calc-helper, .preset-btn, .calc-metric-sub, .calc-status { font-size: 12px; }
  .calc-metric-grid { grid-template-columns: minmax(0, 1fr); }
  .calc-results-card, .calc-form-container { padding: 18px; }
  .table-wrapper { overflow-x: auto; -webkit-overflow-scrolling: touch; }
  .data-table { min-width: 720px; }
}