/* InfiniteEcho — Shared Stylesheet */

/* ── Custom Properties ── */
:root {
  --bg-base: #05070c;
  --bg-surface: #0d1420;
  --bg-elevated: #111927;
  --bg-card: #162235;
  --text-primary: #f2f7ff;
  --text-secondary: #9fb2c8;
  --text-muted: #5a7194;
  --accent-blue: #2f8cff;
  --accent-cyan: #67d9ff;
  --accent-violet: #8b5cf6;
  --accent-teal: #2dd4bf;
  --accent-orange: #f59e0b;
  --border-hairline: rgba(159, 178, 200, 0.12);
  --border-blue: rgba(47, 140, 255, 0.25);
  --border-cyan: rgba(103, 217, 255, 0.2);
  --glow-blue: rgba(47, 140, 255, 0.15);
  --glow-cyan: rgba(103, 217, 255, 0.1);
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --font-sans: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  --space-4xl: 6rem;
  --max-width: 1200px;
  --header-height: 64px;
}

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

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

body {
  font-family: var(--font-sans);
  background: var(--bg-base);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.splash-pending body {
  overflow: hidden;
}

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

a {
  color: var(--accent-blue);
  text-decoration: none;
  transition: color 0.2s ease;
}

a:hover {
  color: var(--accent-cyan);
}

/* ── Focus States ── */
a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--accent-cyan);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

/* ── 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;
  }
}

/* ── First Render Splash ── */
.site-preloader {
  display: none;
}

.splash-pending .site-preloader {
  position: fixed;
  inset: 0;
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: center;
  background:
    radial-gradient(circle at 50% 45%, rgba(47, 140, 255, 0.13), transparent 34rem),
    var(--bg-base);
  opacity: 1;
  visibility: visible;
  transition: opacity 0.65s ease, visibility 0.65s ease;
}

.splash-pending .site-preloader.hidden {
  opacity: 0;
  visibility: hidden;
}

.site-preloader-content {
  width: min(70vw, 520px);
  text-align: center;
}

.site-preloader-logo {
  width: min(64vw, 420px);
  height: auto;
  margin: 0 auto var(--space-xl);
  filter: drop-shadow(0 0 18px rgba(103, 217, 255, 0.28));
  animation: splashLogoIn 0.9s ease forwards;
}

.site-preloader-line {
  position: relative;
  width: min(42vw, 260px);
  height: 1px;
  margin: 0 auto;
  overflow: hidden;
  background: rgba(159, 178, 200, 0.16);
}

.site-preloader-line::after {
  content: '';
  position: absolute;
  inset: 0;
  transform: translateX(-100%);
  background: linear-gradient(90deg, transparent, var(--accent-blue), var(--accent-cyan));
  animation: splashLoadLine 1.55s ease-in-out forwards;
}

@keyframes splashLogoIn {
  from {
    opacity: 0;
    transform: translateY(14px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes splashLoadLine {
  from {
    transform: translateX(-100%);
  }
  to {
    transform: translateX(0);
  }
}

/* ── Layout ── */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-xl);
}

.section {
  padding: var(--space-4xl) 0;
}

.section-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent-cyan);
  margin-bottom: var(--space-md);
}

.section-title {
  font-size: 1.75rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--space-lg);
  line-height: 1.3;
}

.section-desc {
  font-size: 1rem;
  color: var(--text-secondary);
  max-width: 640px;
  line-height: 1.7;
}

/* ── Header / Navigation ── */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(5, 7, 12, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-hairline);
  height: var(--header-height);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-height);
}

.site-mark {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-weight: 600;
  font-size: 1.1rem;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}

.site-mark:hover {
  color: var(--text-primary);
}

.site-logo {
  width: 70px;
  height: 24px;
  object-fit: contain;
  flex-shrink: 0;
}

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

.nav-desktop a {
  color: var(--text-secondary);
  font-size: 0.875rem;
  font-weight: 500;
  padding: var(--space-sm) 0;
  position: relative;
  transition: color 0.2s ease;
}

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

.nav-desktop a.active::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  right: 0;
  height: 1px;
  background: var(--accent-blue);
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-sm);
  color: var(--text-primary);
}

.nav-toggle svg {
  width: 24px;
  height: 24px;
}

/* ── Hero ── */
.hero {
  position: relative;
  padding: var(--space-4xl) 0 var(--space-3xl);
  overflow: hidden;
}

.hero-inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr) clamp(440px, 36vw, 520px);
  align-items: center;
  gap: var(--space-2xl);
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 640px;
}

.hero-title {
  font-size: clamp(2.5rem, 5vw, 3.5rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.1;
  margin-bottom: var(--space-lg);
  color: var(--text-primary);
}

.hero-title .accent {
  color: var(--accent-blue);
}

.hero-subtitle {
  font-size: 1.125rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: var(--space-xl);
  max-width: 560px;
}

.hero-links {
  display: flex;
  gap: var(--space-md);
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 0.625rem 1.25rem;
  font-size: 0.875rem;
  font-weight: 500;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-blue);
  background: var(--bg-elevated);
  color: var(--text-primary);
  transition: all 0.2s ease;
  cursor: pointer;
}

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

.btn-primary {
  background: var(--accent-blue);
  border-color: var(--accent-blue);
  color: #fff;
}

.btn-primary:hover {
  background: #1a7aef;
  border-color: #1a7aef;
  color: #fff;
}

.hero-visual {
  width: clamp(440px, 36vw, 520px);
  height: 220px;
  justify-self: end;
  pointer-events: none;
  opacity: 0.6;
}

.hero-visual img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  object-position: center right;
}

/* ── What Lives Here ── */
.what-lives-here {
  background: var(--bg-surface);
  border-top: 1px solid var(--border-hairline);
  border-bottom: 1px solid var(--border-hairline);
}

.what-lives-here-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-xl);
  margin-top: var(--space-2xl);
}

.what-lives-here-item {
  padding: var(--space-xl);
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-md);
  background: var(--bg-elevated);
  transition: border-color 0.2s ease, transform 0.2s ease;
}

.what-lives-here-item:hover {
  border-color: var(--border-blue);
  transform: translateY(-2px);
}

.what-lives-here-icon {
  margin-bottom: var(--space-md);
}

.what-lives-here-icon svg {
  width: 32px;
  height: 32px;
}

.what-lives-here-item h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: var(--space-sm);
  color: var(--text-primary);
}

.what-lives-here-item p {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ── Project Cards ── */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: var(--space-xl);
  margin-top: var(--space-2xl);
}

.project-card {
  display: flex;
  flex-direction: column;
  padding: var(--space-xl);
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-md);
  background: var(--bg-elevated);
  transition: border-color 0.2s ease, transform 0.2s ease, box-shadow 0.2s ease;
}

.project-card:hover {
  border-color: var(--border-blue);
  transform: translateY(-2px);
  box-shadow: 0 8px 32px rgba(47, 140, 255, 0.08);
}

.project-card-header {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  margin-bottom: var(--space-md);
}

.project-card-icon {
  flex-shrink: 0;
}

.project-card-icon svg {
  width: 40px;
  height: 40px;
}

.project-card h3 {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--text-primary);
}

.project-card-status {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--accent-cyan);
  background: rgba(103, 217, 255, 0.08);
  padding: 0.25rem 0.5rem;
  border-radius: var(--radius-sm);
  margin-bottom: var(--space-md);
}

.project-card-status::before {
  content: '';
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent-cyan);
}

.project-card p {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.6;
  flex-grow: 1;
}

.project-card-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  margin-top: var(--space-lg);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--accent-blue);
}

.project-card-link svg {
  width: 16px;
  height: 16px;
  transition: transform 0.2s ease;
}

.project-card:hover .project-card-link svg {
  transform: translateX(3px);
}

/* ── Placeholder Sections ── */
.placeholder-section {
  padding: var(--space-3xl) 0;
}

.placeholder-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--space-lg);
  margin-top: var(--space-xl);
}

.placeholder-card {
  aspect-ratio: 16 / 10;
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-md);
  background: var(--bg-elevated);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}

.placeholder-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(
    0deg,
    transparent,
    transparent 20px,
    rgba(159, 178, 200, 0.03) 20px,
    rgba(159, 178, 200, 0.03) 21px
  ),
  repeating-linear-gradient(
    90deg,
    transparent,
    transparent 20px,
    rgba(159, 178, 200, 0.03) 20px,
    rgba(159, 178, 200, 0.03) 21px
  );
}

.placeholder-card span {
  position: relative;
  z-index: 1;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
  letter-spacing: 0.05em;
}

/* ── Project Detail Page ── */
.project-detail {
  padding: var(--space-3xl) 0;
}

.project-detail-header {
  margin-bottom: var(--space-2xl);
}

.project-detail-title {
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-md);
}

.project-detail-summary {
  font-size: 1.125rem;
  color: var(--text-secondary);
  line-height: 1.7;
  max-width: 640px;
}

.status-strip {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-lg);
  background: rgba(47, 140, 255, 0.08);
  border: 1px solid var(--border-blue);
  border-radius: var(--radius-md);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--accent-blue);
  margin: var(--space-xl) 0;
}

.screenshot-frame {
  border: 1px solid var(--border-blue);
  border-radius: var(--radius-md);
  background: var(--bg-surface);
  padding: var(--space-lg);
  margin: var(--space-xl) 0;
  position: relative;
}

.screenshot-frame::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--accent-blue), transparent);
}

.screenshot-placeholder {
  aspect-ratio: 16 / 9;
  background: var(--bg-elevated);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}

.screenshot-placeholder::before {
  content: '';
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(
    0deg,
    transparent,
    transparent 16px,
    rgba(159, 178, 200, 0.04) 16px,
    rgba(159, 178, 200, 0.04) 17px
  );
}

.screenshot-placeholder span {
  position: relative;
  z-index: 1;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  margin-top: var(--space-2xl);
  font-size: 0.875rem;
  color: var(--text-secondary);
}

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

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

/* ── Footer ── */
.site-footer {
  border-top: 1px solid var(--border-hairline);
  padding: var(--space-2xl) 0;
  margin-top: var(--space-4xl);
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-md);
}

.footer-copy {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.footer-links {
  display: flex;
  gap: var(--space-lg);
  list-style: none;
}

.footer-links a {
  font-size: 0.8rem;
  color: var(--text-muted);
}

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

/* ── Divider ── */
.divider {
  height: 1px;
  background: var(--border-hairline);
  margin: var(--space-2xl) 0;
}

/* ── Mobile Nav (always hidden by default) ── */
.nav-mobile {
  display: none;
  position: absolute;
  top: var(--header-height);
  left: 0;
  right: 0;
  background: rgba(5, 7, 12, 0.95);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-hairline);
  padding: var(--space-lg);
  z-index: 101;
}

/* ── Responsive ── */
@media (max-width: 1024px) {
  .hero-inner {
    grid-template-columns: minmax(0, 1fr) clamp(320px, 36vw, 400px);
    gap: var(--space-xl);
  }

  .hero-visual {
    width: clamp(320px, 36vw, 400px);
    height: 170px;
    opacity: 0.5;
  }
}

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

  .nav-toggle {
    display: block;
  }

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

  .nav-mobile ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
  }

  .nav-mobile a {
    display: block;
    padding: var(--space-sm) 0;
    color: var(--text-secondary);
    font-size: 1rem;
    font-weight: 500;
  }

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

  .hero {
    padding: var(--space-2xl) 0 var(--space-xl);
  }

  .hero-inner {
    display: block;
  }

  .hero-visual {
    width: min(100%, 420px);
    height: auto;
    margin: var(--space-xl) auto 0 0;
    opacity: 0.72;
  }

  .hero-visual img {
    height: auto;
    max-height: 280px;
    object-position: center;
  }

  .what-lives-here-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-md);
  }

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

  .section-title {
    font-size: 1.5rem;
  }

  .footer-inner {
    flex-direction: column;
    text-align: center;
  }
}

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

  .what-lives-here-grid {
    grid-template-columns: 1fr;
  }

  .hero-links {
    flex-direction: column;
  }

  .btn {
    justify-content: center;
  }
}

/* ── Workflow Diagram ── */
.workflow-diagram {
  display: flex;
  align-items: stretch;
  gap: var(--space-md);
  margin-top: var(--space-xl);
  overflow-x: auto;
}

.workflow-step {
  flex: 1;
  padding: var(--space-lg);
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-md);
  background: var(--bg-elevated);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 160px;
}

.workflow-arrow {
  flex-shrink: 0;
  width: 48px;
  padding-top: calc(80px - 16px);
}

.workflow-annotation {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md);
  margin-top: var(--space-xl);
}

.workflow-annotation span {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  padding: 0.25rem 0.5rem;
  border-radius: var(--radius-sm);
}

/* ── Private Status ── */
.status-private {
  background: rgba(245, 158, 11, 0.08);
  border-color: rgba(245, 158, 11, 0.25);
  color: var(--accent-orange);
}

/* ── Hero Chip Row ── */
.chip-row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  margin-top: var(--space-lg);
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--accent-cyan);
  background: rgba(103, 217, 255, 0.08);
  padding: 0.25rem 0.6rem;
  border-radius: var(--radius-sm);
  border: 1px solid rgba(103, 217, 255, 0.15);
}

.chip::before {
  content: '';
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--accent-cyan);
}

.chip.chip-blue {
  color: var(--accent-blue);
  background: rgba(47, 140, 255, 0.08);
  border-color: rgba(47, 140, 255, 0.15);
}

.chip.chip-blue::before {
  background: var(--accent-blue);
}

.chip.chip-teal {
  color: var(--accent-teal);
  background: rgba(45, 212, 191, 0.08);
  border-color: rgba(45, 212, 191, 0.15);
}

.chip.chip-teal::before {
  background: var(--accent-teal);
}

.chip.chip-violet {
  color: var(--accent-violet);
  background: rgba(139, 92, 246, 0.08);
  border-color: rgba(139, 92, 246, 0.15);
}

.chip.chip-violet::before {
  background: var(--accent-violet);
}

.chip-row .chip:last-child::before {
  display: none;
}

/* ── Hero CTAs ── */
.hero-ctas {
  display: flex;
  gap: var(--space-md);
  margin-top: var(--space-lg);
  flex-wrap: wrap;
}

/* ── Feature Grid ── */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--space-md);
  margin-top: var(--space-xl);
}

.feature-item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-md);
  padding: var(--space-md) var(--space-lg);
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-md);
  background: var(--bg-elevated);
  transition: border-color 0.2s ease;
}

.feature-item:hover {
  border-color: var(--border-blue);
}

.feature-item svg {
  flex-shrink: 0;
  margin-top: 2px;
}

.feature-item strong {
  display: block;
  font-size: 0.938rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--space-xs);
}

.feature-item span {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ── Architecture Diagram Wrapper ── */
.diagram-wrapper {
  margin-top: var(--space-xl);
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-md);
  background: var(--bg-surface);
  padding: var(--space-xl);
  overflow-x: auto;
}

.diagram-caption {
  font-size: 0.8125rem;
  color: var(--text-muted);
  line-height: 1.7;
  margin-top: var(--space-lg);
  max-width: 720px;
}

/* ── Safety Table ── */
.safety-table {
  width: 100%;
  margin-top: var(--space-xl);
  border-collapse: collapse;
  font-size: 0.875rem;
}

.safety-table th {
  text-align: left;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--accent-cyan);
  padding: var(--space-sm) var(--space-md);
  border-bottom: 1px solid var(--border-hairline);
}

.safety-table td {
  padding: var(--space-md);
  color: var(--text-secondary);
  line-height: 1.6;
  border-bottom: 1px solid var(--border-hairline);
  vertical-align: top;
}

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

.safety-table td:first-child {
  font-weight: 600;
  color: var(--text-primary);
  white-space: nowrap;
}

.safety-risk {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  padding: 0.125rem 0.4rem;
  border-radius: var(--radius-sm);
}

.safety-risk.readonly {
  color: var(--accent-teal);
  background: rgba(45, 212, 191, 0.1);
}

.safety-risk.write {
  color: var(--accent-orange);
  background: rgba(245, 158, 11, 0.1);
}

.safety-risk.destructive {
  color: var(--accent-blue);
  background: rgba(47, 140, 255, 0.1);
}

/* ── Engineering Highlights ── */
.highlights-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: var(--space-md);
  margin-top: var(--space-xl);
}

.highlight-item {
  padding: var(--space-lg);
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-md);
  background: var(--bg-elevated);
  transition: border-color 0.2s ease;
}

.highlight-item:hover {
  border-color: var(--border-blue);
}

.highlight-item strong {
  display: block;
  font-size: 0.938rem;
  font-weight: 600;
  color: var(--accent-blue);
  margin-bottom: var(--space-sm);
}

.highlight-item p {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.65;
}

/* ── Step Flow ── */
.step-flow {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
  margin-top: var(--space-xl);
  position: relative;
}

.step-item {
  display: flex;
  gap: var(--space-lg);
  align-items: flex-start;
}

.step-number {
  flex-shrink: 0;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: 1px solid var(--border-blue);
  background: var(--bg-elevated);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--accent-blue);
}

.step-content strong {
  display: block;
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--space-xs);
}

.step-content p {
  font-size: 0.938rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ── Status Grid (Built / Next) ── */
.status-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-xl);
  margin-top: var(--space-xl);
}

.status-column h3 {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--accent-cyan);
  margin-bottom: var(--space-md);
}

.status-column ul {
  list-style: none;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.status-column li {
  display: flex;
  align-items: flex-start;
  gap: var(--space-sm);
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.status-column li::before {
  content: '';
  flex-shrink: 0;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent-blue);
  margin-top: 7px;
}

.status-column.next li::before {
  background: var(--accent-cyan);
}

/* ── Lessons Grid ── */
.lessons-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
  margin-top: var(--space-xl);
  max-width: 640px;
}

.lesson-item {
  display: flex;
  gap: var(--space-md);
  align-items: flex-start;
}

.lesson-item .lesson-icon {
  flex-shrink: 0;
  margin-top: 2px;
}

.lesson-item p {
  font-size: 0.938rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ── Callout Blocks ── */
.callout {
  padding: var(--space-lg) var(--space-xl);
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-md);
  background: var(--bg-elevated);
  margin-top: var(--space-xl);
}

.callout p {
  font-size: 0.938rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin: 0;
}

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

.callout-code {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--accent-cyan);
  background: rgba(103, 217, 255, 0.06);
  padding: 0.125rem 0.375rem;
  border-radius: var(--radius-sm);
}

/* ── Mobile Responsive ── */
@media (max-width: 768px) {
  .features-grid {
    grid-template-columns: 1fr;
  }

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

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

  .safety-table {
    font-size: 0.8125rem;
  }

  .safety-table th,
  .safety-table td {
    padding: var(--space-sm) var(--space-md);
  }
}

@media (max-width: 480px) {
  .hero-ctas {
    flex-direction: column;
  }

  .hero-ctas .btn {
    justify-content: center;
  }

  .chip-row {
    gap: var(--space-xs);
  }
}

/* ── Print ── */
/* ── Data Tables ── */
.data-table-wrapper {
  overflow-x: auto;
  margin-top: var(--space-xl);
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-md);
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.8125rem;
  min-width: 600px;
}

.data-table th {
  text-align: left;
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--accent-cyan);
  padding: var(--space-sm) var(--space-md);
  border-bottom: 1px solid var(--border-hairline);
  background: var(--bg-elevated);
  white-space: nowrap;
}

.data-table td {
  padding: var(--space-md);
  color: var(--text-secondary);
  line-height: 1.6;
  border-bottom: 1px solid var(--border-hairline);
  vertical-align: top;
}

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

.data-table td:first-child {
  font-weight: 600;
  color: var(--text-primary);
}

.data-table code {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent-cyan);
  background: rgba(103, 217, 255, 0.06);
  padding: 0.125rem 0.375rem;
  border-radius: var(--radius-sm);
  white-space: nowrap;
}

/* ── Code Path ── */
.code-path {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent-cyan);
  background: rgba(103, 217, 255, 0.06);
  padding: 0.125rem 0.375rem;
  border-radius: var(--radius-sm);
  white-space: nowrap;
}

/* ── Missing Data Callout ── */
.missing-data {
  padding: var(--space-md) var(--space-lg);
  border: 1px solid rgba(245, 158, 11, 0.25);
  border-radius: var(--radius-md);
  background: rgba(245, 158, 11, 0.04);
  margin-top: var(--space-lg);
}

.missing-data p {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.missing-data code {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent-orange);
}

/* ── Subsection ── */
.subsection {
  margin-top: var(--space-3xl);
}

.subsection + .subsection {
  margin-top: var(--space-3xl);
}

.subsection-title {
  font-size: 1.375rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--space-sm);
}

.subsection-meta {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-bottom: var(--space-lg);
}

@media (max-width: 768px) {
  .data-table {
    min-width: 500px;
  }
}

@media print {
  .site-header,
  .hero-visual,
  .site-footer {
    display: none;
  }

  body {
    background: #fff;
    color: #000;
  }

  a {
    color: #000;
  }
}