/* ==========================================================================
   tark-pass: Landing Page Design System
   Anti-Slop High-Craft Principles: 100% solid surfaces, sharp geometry,
   zero emojis, zero circular dots, zero capsule pills, strict zero-translucency.
   ========================================================================== */

:root {
  color-scheme: dark;

  /* Solid Neutral Palette (No Opacity Modifiers) */
  --bg-canvas: #09090b;
  --bg-surface: #121215;
  --bg-elevated: #18181b;
  --bg-subtle: #202024;
  --bg-input: #0e0e11;
  --bg-hover: #27272a;

  /* Solid Hairline Borders */
  --border-subtle: #27272a;
  --border-medium: #323238;
  --border-strong: #3f3f46;
  --border-focus: #2563eb;

  /* Typographic Contrast Ratios >= 7:1 (Headings) and >= 4.5:1 (Body) */
  --text-primary: #f4f4f5;
  --text-secondary: #a1a1aa;
  --text-muted: #71717a;
  --text-inverse: #09090b;

  /* Single Tint Accent (10% Maximum - Royal Cobalt) */
  --accent: #2563eb;
  --accent-hover: #1d4ed8;
  --accent-active: #1e40af;
  --accent-surface: #1e3a8a;
  --accent-text: #ffffff;

  /* Semantic Direct Solid Text Colors */
  --semantic-success: #34d399;
  --semantic-warning: #fbbf24;
  --semantic-danger: #f87171;
  --semantic-info: #60a5fa;

  /* Fonts */
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Inter", Helvetica, Arial, sans-serif;
  --font-mono: "JetBrains Mono", "SF Mono", Menlo, Consolas, monospace;

  /* Layout Containers */
  --max-w-content: 1160px;
  --max-w-prose: 68ch;
}

/* Reset & Containment (Prevent Mobile Blowout) */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  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;
}

/* Guardrail 2: Document Root Containment (Zero Horizontal Scroll / Anti-Blowout) */
html,
body {
  max-width: 100%;
  overflow-x: hidden;
  position: relative;
  -webkit-overflow-scrolling: touch;
}

body {
  background-color: var(--bg-canvas);
  color: var(--text-primary);
  min-height: 100vh;
}

main#main-content {
  width: 100%;
  max-width: 100%;
  overflow-x: hidden;
  position: relative;
}

/* Universal Anti-Blowout Guardrails */
img,
svg,
picture {
  max-width: 100%;
}

/* Skip Navigation Link (WCAG 2.4.1) */
.skip-link {
  position: absolute;
  top: -60px;
  left: 16px;
  z-index: 1000;
  padding: 10px 18px;
  background: var(--bg-elevated);
  color: var(--text-primary);
  border: 1px solid var(--border-medium);
  border-radius: 2px;
  font-size: 14px;
  font-family: var(--font-mono);
  text-decoration: none;
  transition: top 150ms ease-out;
}

.skip-link:focus {
  top: 16px;
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* Typography Standards */
h1, h2, h3, h4 {
  color: var(--text-primary);
  letter-spacing: -0.025em;
  line-height: 1.2;
  text-wrap: balance;
}

h1 {
  font-size: 2.15rem;
  font-weight: 700;
}

@media (min-width: 540px) {
  h1 {
    font-size: 2.75rem;
  }
}

@media (min-width: 768px) {
  h1 {
    font-size: 3.75rem;
  }
}

h2 {
  font-size: 1.5rem;
  font-weight: 600;
}

@media (min-width: 768px) {
  h2 {
    font-size: 2.25rem;
  }
}

h3 {
  font-size: 1.25rem;
  font-weight: 600;
}

p {
  color: var(--text-secondary);
  line-height: 1.65;
}

.prose-measure {
  max-width: var(--max-w-prose);
}

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

.tabular-nums {
  font-variant-numeric: tabular-nums;
}

/* Accessible High-Contrast Focus Rings (WCAG 2.4.7) */
a:focus-visible,
button:focus-visible,
summary:focus-visible,
input:focus-visible {
  outline: 2px solid var(--border-focus);
  outline-offset: 2px;
}

/* Navigation Header (1:1 Attention Ratio Minimal Anchor) */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background-color: var(--bg-canvas);
  border-bottom: 1px solid var(--border-subtle);
  width: 100%;
}

.header-container {
  max-width: var(--max-w-content);
  margin: 0 auto;
  padding: 0 16px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
}

@media (min-width: 768px) {
  .header-container {
    padding: 0 24px;
  }
}

.brand-anchor {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--text-primary);
}

.brand-icon {
  width: 28px;
  height: 28px;
  color: var(--accent);
  flex-shrink: 0;
}

.brand-title {
  font-family: var(--font-sans);
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

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

.header-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

/* Intentional Sharp Rectangular Buttons (Developer Tools & Vault Archetype) */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  text-decoration: none;
  height: 42px;
  min-height: 42px;
  padding: 0 18px;
  border-radius: 2px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: background-color 140ms ease-out, border-color 140ms ease-out, color 140ms ease-out;
  white-space: nowrap;
  max-width: 100%;
}

@media (max-width: 480px) {
  .btn {
    width: 100%;
    white-space: normal;
    text-align: center;
  }
}

/* Primary Accent Action */
.btn-primary {
  background-color: var(--accent);
  color: var(--accent-text);
  border-color: var(--accent);
}

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

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

/* Secondary Mechanical Action (Inversion) */
.btn-secondary {
  background-color: var(--bg-surface);
  color: var(--text-primary);
  border-color: var(--border-medium);
}

.btn-secondary:hover {
  background-color: var(--text-primary);
  color: var(--bg-canvas);
  border-color: var(--text-primary);
}

.btn-secondary:active {
  background-color: #e4e4e7;
}

/* Ghost / Minimal Action */
.btn-ghost {
  background-color: transparent;
  color: var(--text-secondary);
  border-color: transparent;
}

.btn-ghost:hover {
  color: var(--text-primary);
  background-color: var(--bg-surface);
  border-color: var(--border-subtle);
}

/* Hero Section (Mandatory Atmospheric Background Image) */
.hero-section {
  position: relative;
  min-height: 75vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  border-bottom: 1px solid var(--border-subtle);
  padding: 64px 16px 80px;
  width: 100%;
}

@media (min-width: 768px) {
  .hero-section {
    padding: 80px 24px 96px;
  }
}

/* Architectural Blueprint Texture Layer */
.hero-background-plate {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  opacity: 0.35;
  pointer-events: none;
  user-select: none;
  z-index: 1;
}

/* Solid Radial & Linear Vignette Mask (Guarantees >= 7:1 Headline Contrast) */
.hero-vignette {
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at center, transparent 20%, #09090b 80%),
              linear-gradient(to bottom, #09090b 0%, transparent 25%, transparent 75%, #09090b 100%);
  pointer-events: none;
  user-select: none;
  z-index: 2;
}

.hero-container {
  position: relative;
  z-index: 5;
  max-width: 860px;
  margin: 0 auto;
  text-align: center;
  width: 100%;
}

.hero-kicker {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 18px;
}

.hero-title {
  margin-bottom: 24px;
}

/* Cryptographic Cipher Text Decrypt Transition */
.crypto-char {
  display: inline;
}

.crypto-char.active {
  color: #60a5fa;
  text-shadow: 0 0 2px rgba(96, 165, 250, 0.45);
}

.crypto-char.scrambled {
  color: #71717a;
  opacity: 0.55;
}

.crypto-char.resolved {
  color: inherit;
}

.hero-lead {
  font-size: 1.15rem;
  line-height: 1.7;
  color: var(--text-secondary);
  max-width: 62ch;
  margin: 0 auto 36px;
}

.hero-cta-group {
  display: flex;
  flex-direction: column;
  gap: 14px;
  justify-content: center;
  align-items: center;
  width: 100%;
}

@media (min-width: 540px) {
  .hero-cta-group {
    flex-direction: row;
    gap: 16px;
    width: auto;
  }
}

.hero-devices {
  display: inline-flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 12px 14px;
  margin-top: 24px;
  padding: 8px 18px;
  background-color: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  max-width: 100%;
}

@media (max-width: 600px) {
  .hero-devices {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
    padding: 12px 16px;
    width: 100%;
    max-width: 320px;
    margin-left: auto;
    margin-right: auto;
  }
  .hero-device-divider {
    display: none;
  }
}

.hero-device-item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--text-secondary);
}

.hero-device-item svg {
  color: var(--accent);
  flex-shrink: 0;
}

.hero-device-divider {
  color: var(--border-medium);
  font-size: 0.75rem;
}

.hero-microcopy {
  margin-top: 18px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
  letter-spacing: 0.02em;
}

/* General Layout Containers */
.section-container {
  max-width: var(--max-w-content);
  margin: 0 auto;
  padding: 64px 16px;
  width: 100%;
}

@media (min-width: 768px) {
  .section-container {
    padding: 88px 24px;
  }
}

.section-bordered {
  border-top: 1px solid var(--border-subtle);
}

.terminal-sqlite-header {
  background-color: var(--bg-canvas);
  padding: 12px 16px;
  border-bottom: 1px solid var(--border-subtle);
}

.terminal-sqlite-body {
  padding: 16px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  background-color: var(--bg-canvas);
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  max-width: 100%;
}

.split-secondary-footer {
  border-top: 1px solid var(--border-subtle);
  padding-top: 16px;
}

.section-header {
  margin-bottom: 48px;
}

.section-kicker {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 12px;
}

.section-title {
  margin-bottom: 14px;
}

.section-desc {
  max-width: 60ch;
  font-size: 1.05rem;
}

/* Asymmetric 2/3 and 1/3 Architectural Split (Breaking Card Syndrome) */
.split-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  border: 1px solid var(--border-subtle);
  background-color: var(--bg-surface);
  border-radius: 2px;
  width: 100%;
  max-width: 100%;
  min-width: 0;
  overflow: hidden;
}

@media (min-width: 900px) {
  .split-grid {
    grid-template-columns: 1.6fr 1fr;
  }
}

.split-primary {
  padding: 24px 16px;
  border-bottom: 1px solid var(--border-subtle);
  min-width: 0;
  max-width: 100%;
}

@media (min-width: 768px) {
  .split-primary {
    padding: 36px;
  }
}

@media (min-width: 900px) {
  .split-primary {
    border-bottom: none;
    border-right: 1px solid var(--border-subtle);
  }
}

.split-secondary {
  padding: 24px 16px;
  background-color: var(--bg-elevated);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  min-width: 0;
  max-width: 100%;
}

@media (min-width: 768px) {
  .split-secondary {
    padding: 36px;
  }
}

/* Interactive Cryptographic Pipeline Steps */
.pipeline-step {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 16px 0;
  border-bottom: 1px solid var(--border-subtle);
  min-width: 0;
  max-width: 100%;
}

@media (min-width: 768px) {
  .pipeline-step {
    gap: 18px;
  }
}

.pipeline-step:last-child {
  border-bottom: none;
}

.step-details {
  min-width: 0;
  max-width: 100%;
  overflow-wrap: break-word;
}

.step-number {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  padding: 4px 8px;
  background-color: var(--bg-canvas);
  color: var(--accent);
  border: 1px solid var(--border-medium);
  border-radius: 2px;
  flex-shrink: 0;
}

.step-details h4 {
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 4px;
  color: var(--text-primary);
}

.step-details p {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

.step-code-inline {
  display: inline-block;
  margin-top: 6px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  padding: 3px 8px;
  background-color: var(--bg-canvas);
  color: var(--text-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: 2px;
  max-width: 100%;
  overflow-wrap: break-word;
  word-break: break-word;
  white-space: normal;
}

/* ==========================================================================
   COMPETITOR COMPARISON TABLE (What tark-pass has that competitors don't)
   ========================================================================== */
.comp-table-wrap {
  width: 100%;
  max-width: 100%;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  border: 1px solid var(--border-subtle);
  background-color: var(--bg-surface);
  border-radius: 2px;
  position: relative;
}

.comp-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  min-width: 820px;
}

.comp-table th,
.comp-table td {
  padding: 12px 18px;
  border-bottom: 1px solid var(--border-subtle);
  border-right: 1px solid var(--border-subtle);
  vertical-align: middle;
}

.comp-table th:last-child,
.comp-table td:last-child {
  border-right: none;
}

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

.comp-table th {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  background-color: var(--bg-canvas);
}

/* Highlighted Column for tark-pass */
.comp-table th.col-highlight {
  background-color: #121626;
  color: #93c5fd;
  border-left: 1px solid var(--accent);
  border-right: 1px solid var(--accent);
  border-top: 2px solid var(--accent);
}

.comp-table td.col-highlight {
  background-color: #0d111d;
  border-left: 1px solid #1e3a8a;
  border-right: 1px solid #1e3a8a;
  color: var(--text-primary);
}

.comp-feature-name {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 2px;
}

.comp-feature-sub {
  font-size: 0.75rem;
  color: var(--text-muted);
  line-height: 1.4;
}

.comp-val-lead {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--semantic-success);
}

.comp-val-neutral {
  font-size: 0.8125rem;
  color: var(--text-secondary);
}

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

/* Colored Tick and Cross Indicators */
.comp-icon {
  width: 15px;
  height: 15px;
  flex-shrink: 0;
  display: inline-block;
  vertical-align: -2px;
}

.comp-icon-tick {
  color: var(--semantic-success);
}

.comp-icon-cross {
  color: var(--semantic-danger);
}

.comp-cell-val {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  line-height: 1.3;
}

/* Ecosystem Grid (Asymmetric Structural Rhythm) */
.ecosystem-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}

@media (min-width: 768px) {
  .ecosystem-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1080px) {
  .ecosystem-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.ecosystem-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: 2px;
  padding: 30px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  min-height: 240px;
  transition: border-color 150ms ease-out;
}

.ecosystem-card:hover {
  border-color: var(--border-medium);
}

.ecosystem-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
}

.card-tech-badge {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.ecosystem-icon {
  width: 22px;
  height: 22px;
  color: var(--text-primary);
}

.ecosystem-card h3 {
  margin-bottom: 10px;
}

.ecosystem-card p {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 24px;
}

.ecosystem-card-link {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--accent);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-weight: 500;
}

.ecosystem-card-link:hover {
  text-decoration: underline;
}

/* FAQ / Objection Handling (Accessible <details> / <summary>) */
.faq-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  min-width: 0;
  max-width: 100%;
}

.faq-item {
  border: 1px solid var(--border-subtle);
  background-color: var(--bg-surface);
  border-radius: 2px;
  transition: border-color 140ms ease-out;
  min-width: 0;
  max-width: 100%;
}

.faq-item:hover {
  border-color: var(--border-medium);
}

.faq-item[open] {
  border-color: var(--border-strong);
}

.faq-summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 16px;
  cursor: pointer;
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
  user-select: none;
  list-style: none;
  gap: 12px;
  min-width: 0;
}

@media (min-width: 768px) {
  .faq-summary {
    padding: 22px 24px;
    font-size: 1.05rem;
  }
}

.faq-summary::-webkit-details-marker {
  display: none;
}

.faq-summary svg {
  width: 18px;
  height: 18px;
  color: var(--text-muted);
  transition: transform 180ms ease-out;
  flex-shrink: 0;
}

.faq-item[open] .faq-summary svg {
  transform: rotate(180deg);
  color: var(--accent);
}

.faq-content {
  padding: 0 16px 18px;
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.65;
  border-top: 1px solid var(--border-subtle);
  margin-top: 4px;
  padding-top: 16px;
  min-width: 0;
  max-width: 100%;
  overflow-wrap: break-word;
  word-break: break-word;
}

@media (min-width: 768px) {
  .faq-content {
    padding: 0 24px 24px;
    font-size: 0.95rem;
    padding-top: 18px;
  }
}

/* Closing CTA Banner (High Contrast, Risk Reversed) */
.cta-band {
  background-color: var(--bg-surface);
  border-top: 1px solid var(--border-subtle);
  border-bottom: 1px solid var(--border-subtle);
  padding: 64px 16px;
  text-align: center;
  width: 100%;
}

@media (min-width: 768px) {
  .cta-band {
    padding: 88px 24px;
  }
}

.cta-band-container {
  max-width: 680px;
  margin: 0 auto;
  width: 100%;
}

.cta-band h2 {
  margin-bottom: 16px;
}

.cta-band p {
  font-size: 1.1rem;
  margin-bottom: 32px;
}

/* Legal & Compliance Utility Footer (WCAG 2.2 AA & Legal Links) */
.site-footer {
  background-color: var(--bg-canvas);
  border-top: 1px solid var(--border-subtle);
  padding: 40px 16px;
  width: 100%;
}

@media (min-width: 768px) {
  .site-footer {
    padding: 48px 24px;
  }
}

.footer-container {
  max-width: var(--max-w-content);
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 24px;
  width: 100%;
}

@media (min-width: 768px) {
  .footer-container {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    gap: 28px;
  }
}

.footer-meta {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.footer-brand {
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--text-primary);
}

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

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 16px 20px;
}

.footer-link {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--text-muted);
  text-decoration: none;
  transition: color 120ms ease-out;
}

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

/* Accessibility: Reduced Motion */
@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;
  }
}


/* Installation & Platform Guides */
.install-tabs-wrap {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  background-color: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  padding: 6px;
  border-radius: var(--radius-sm);
  margin-bottom: 32px;
  width: 100%;
  max-width: 100%;
}

@media (max-width: 640px) {
  .install-tabs-wrap {
    flex-direction: column;
    padding: 4px;
    gap: 4px;
  }
}

.install-tab-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  min-height: 44px;
  padding: 10px 16px;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--text-muted);
  background-color: transparent;
  border: 1px solid transparent;
  border-radius: 2px;
  cursor: pointer;
  transition: color 120ms ease-out, background-color 120ms ease-out, border-color 120ms ease-out;
  flex: 1 1 auto;
  max-width: 100%;
}

@media (max-width: 640px) {
  .install-tab-btn {
    width: 100%;
    justify-content: flex-start;
  }
}

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

.install-tab-btn.active {
  color: var(--text-primary);
  background-color: var(--bg-surface-elevated);
  border-color: var(--border-medium);
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.4);
}

.install-tab-btn:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.tab-detected-badge {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--accent);
  font-weight: 600;
  margin-left: 4px;
}

.install-panel {
  display: none;
}

.install-panel[hidden] {
  display: none !important;
}

.install-panel.active {
  display: grid !important;
  grid-template-columns: 1fr;
  gap: 32px;
  min-width: 0;
  max-width: 100%;
  width: 100%;
}

@media (min-width: 960px) {
  .install-panel.active {
    grid-template-columns: 1.15fr 0.85fr !important;
    align-items: start;
  }
}

.install-panel-left {
  display: flex;
  flex-direction: column;
  gap: 24px;
  min-width: 0;
  max-width: 100%;
}

.install-callout-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  padding: 20px 16px;
  border-radius: var(--radius-sm);
  display: flex;
  flex-direction: column;
  gap: 16px;
  min-width: 0;
  max-width: 100%;
}

@media (min-width: 768px) {
  .install-callout-card {
    padding: 24px;
  }
}

.install-callout-header {
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 0;
  max-width: 100%;
}

.install-callout-title {
  font-family: var(--font-sans);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
}

.install-callout-desc {
  font-size: 0.875rem;
  color: var(--text-muted);
  line-height: 1.5;
  overflow-wrap: break-word;
}

.install-btn-group {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  min-width: 0;
  max-width: 100%;
}

@media (max-width: 480px) {
  .install-btn-group {
    flex-direction: column;
  }
}

.install-callout-meta {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
  line-height: 1.4;
  overflow-wrap: break-word;
}

.install-step-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
  min-width: 0;
  max-width: 100%;
}

.install-step-card {
  display: flex;
  gap: 14px;
  background-color: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  padding: 16px;
  border-radius: var(--radius-sm);
  transition: border-color 120ms ease-out;
  min-width: 0;
  max-width: 100%;
}

@media (min-width: 768px) {
  .install-step-card {
    gap: 16px;
    padding: 18px 20px;
  }
}

.install-step-card:hover {
  border-color: var(--border-medium);
}

.install-step-num {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 700;
  color: var(--accent);
  background-color: var(--bg-canvas);
  border: 1px solid var(--border-subtle);
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  border-radius: 2px;
  font-variant-numeric: tabular-nums;
}

.install-step-body {
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 0;
  max-width: 100%;
  overflow-wrap: break-word;
}

.install-step-title {
  font-family: var(--font-sans);
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--text-primary);
}

.install-step-text {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.5;
  overflow-wrap: break-word;
  word-break: break-word;
}

.install-step-code {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: #93c5fd;
  background-color: var(--bg-canvas);
  border: 1px solid var(--border-subtle);
  padding: 3px 8px;
  border-radius: 2px;
  display: inline-block;
  margin-top: 4px;
  max-width: 100%;
  overflow-wrap: break-word;
  word-break: break-word;
  white-space: normal;
}

/* Graphic Mockup Framing */
.install-graphic-panel {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  padding: 16px;
  border-radius: var(--radius-sm);
  display: flex;
  flex-direction: column;
  gap: 14px;
  min-width: 0;
  max-width: 100%;
}

@media (min-width: 768px) {
  .install-graphic-panel {
    padding: 20px;
  }
}

.install-graphic-label {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--border-subtle);
  padding-bottom: 10px;
  min-width: 0;
  max-width: 100%;
}

.install-graphic-tag {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
}

.install-graphic-frame {
  width: 100%;
  max-width: 100%;
  height: auto;
  border-radius: 2px;
  background-color: var(--bg-canvas);
  border: 1px solid var(--border-subtle);
  overflow: hidden;
}

.install-graphic-frame svg {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
}
  width: 100%;
  height: auto;
}


/* Screen reader only utility (WCAG 2.2 AA) */
.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;
}

/* Legal Pages Styling */
.legal-page-container {
  padding-top: 48px;
  padding-bottom: 80px;
}

.legal-content {
  max-width: 720px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 32px;
}

.legal-section {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  padding: 28px 32px;
  border-radius: var(--radius-sm);
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.legal-section h2 {
  font-family: var(--font-sans);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-primary);
  border-bottom: 1px solid var(--border-subtle);
  padding-bottom: 8px;
}

.legal-section p, .legal-section li {
  font-size: 0.9375rem;
  color: var(--text-secondary);
  line-height: 1.65;
}

.legal-section ul {
  padding-left: 20px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.legal-section strong {
  color: var(--text-primary);
}

.legal-section code {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  background-color: var(--bg-canvas);
  border: 1px solid var(--border-subtle);
  padding: 2px 6px;
  border-radius: 2px;
  color: #93c5fd;
}

/* Header Navigation Anchors */
.header-nav {
  display: none;
  align-items: center;
  gap: 20px;
}

@media (min-width: 900px) {
  .header-nav {
    display: flex;
  }
}

.nav-link {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--text-muted);
  text-decoration: none;
  transition: color 120ms ease-out;
}

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

/* Threat Model & Operator Callouts */
.threat-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
  margin-top: 32px;
}

@media (min-width: 768px) {
  .threat-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.threat-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  padding: 24px;
  border-radius: var(--radius-sm);
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.threat-card-title {
  font-family: var(--font-sans);
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 8px;
}

.threat-card-desc {
  font-size: 0.875rem;
  color: var(--text-muted);
  line-height: 1.55;
}

/* Vault Interface Preview Showcase */
.vault-preview-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  overflow: hidden;
  margin: 40px auto 0;
  max-width: 820px;
}

.vault-preview-chrome {
  background-color: var(--bg-surface-elevated);
  border-bottom: 1px solid var(--border-subtle);
  padding: 12px 18px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.vault-preview-search {
  background-color: var(--bg-canvas);
  border: 1px solid var(--border-subtle);
  padding: 6px 12px;
  border-radius: 2px;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--text-muted);
  width: 240px;
}

.vault-preview-body {
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.vault-item-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 16px;
  background-color: var(--bg-canvas);
  border: 1px solid var(--border-subtle);
  border-radius: 2px;
}

.vault-item-left {
  display: flex;
  align-items: center;
  gap: 14px;
}

.vault-item-icon {
  width: 32px;
  height: 32px;
  background-color: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 2px;
  color: var(--color-accent-light);
}

.vault-item-info h4 {
  font-family: var(--font-sans);
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 2px;
}

.vault-item-info span {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
}

.vault-item-right {
  display: flex;
  align-items: center;
  gap: 12px;
}


.sha-code {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: #93c5fd;
  word-break: break-all;
  background-color: var(--bg-canvas);
  border: 1px solid var(--border-subtle);
  padding: 4px 8px;
  border-radius: 2px;
  display: block;
  margin-top: 6px;
}

.comp-table caption {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-muted);
  text-align: left;
  padding-bottom: 12px;
  caption-side: top;
}


.install-note {
  margin-top: 8px;
  font-size: 0.75rem;
  color: var(--text-muted);
  line-height: 1.4;
}

.cli-code-block {
  display: block;
  font-size: 0.75rem;
  padding: 6px 10px;
}

.vault-preview-header-brand {
  display: flex;
  align-items: center;
  gap: 8px;
}

.vault-preview-count {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
}

.btn-copy-item {
  min-height: 32px;
  padding: 4px 10px;
  font-size: 0.75rem;
}

.cli-wrapper {
  margin-top: 16px;
}


code {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  background-color: var(--bg-canvas);
  border: 1px solid var(--border-subtle);
  padding: 2px 6px;
  border-radius: 2px;
  color: #93c5fd;
  max-width: 100%;
  overflow-wrap: break-word;
  word-break: break-word;
}

.checksum-note {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
  line-height: 1.5;
  display: block;
  max-width: 100%;
  overflow-wrap: break-word;
  word-break: break-word;
}

.checksum-note code {
  color: #93c5fd;
  word-break: break-all;
  overflow-wrap: break-word;
  background-color: var(--bg-canvas);
  border: 1px solid var(--border-subtle);
  padding: 2px 6px;
  border-radius: 2px;
  display: inline-block;
  max-width: 100%;
  white-space: normal;
}

/* Touch Device Coarse-Pointer Font Enforcement (Prevent iOS Auto-Zoom) */
@media (hover: none) and (pointer: coarse) {
  input,
  select,
  textarea {
    font-size: 16px !important;
  }
}