/* ==========================================================================
   VoiceAgentHub — Core Stylesheet
   Modern, minimalist, mobile-first, dark-mode-ready
   ========================================================================== */

/* ---------- Design Tokens ---------- */
:root {
  /* Brand palette */
  --color-primary: #4F46E5;
  --color-primary-dark: #3730A3;
  --color-accent: #14B8A6;
  --color-accent-dark: #0F766E;

  /* Light mode surfaces */
  --bg: #FAFAF9;
  --bg-elevated: #FFFFFF;
  --bg-subtle: #F4F4F5;
  --bg-code: #F4F4F5;
  --border: #E5E7EB;
  --border-strong: #D4D4D8;

  /* Text */
  --text: #18181B;
  --text-muted: #52525B;
  --text-subtle: #71717A;
  --text-on-primary: #FFFFFF;

  /* Feedback */
  --color-success: #10B981;
  --color-warning: #F59E0B;
  --color-danger: #EF4444;

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

  /* Spacing scale */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.5rem;
  --space-6: 2rem;
  --space-7: 3rem;
  --space-8: 4rem;
  --space-9: 6rem;

  /* Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 20px;
  --radius-full: 9999px;

  /* Shadow */
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.04), 0 1px 3px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.08), 0 2px 4px -2px rgba(0,0,0,0.05);
  --shadow-lg: 0 10px 25px -5px rgba(0,0,0,0.10), 0 8px 10px -6px rgba(0,0,0,0.05);

  /* Layout */
  --container-max: 1140px;
  --container-narrow: 760px;
  --header-height: 64px;

  /* Motion */
  --transition-fast: 150ms ease;
  --transition: 250ms ease;
  --transition-slow: 400ms cubic-bezier(0.16, 1, 0.3, 1);
}

[data-theme="dark"] {
  --bg: #0A0A0B;
  --bg-elevated: #18181B;
  --bg-subtle: #1F1F23;
  --bg-code: #1F1F23;
  --border: #27272A;
  --border-strong: #3F3F46;
  --text: #FAFAFA;
  --text-muted: #A1A1AA;
  --text-subtle: #71717A;
  --color-primary: #6366F1;
  --color-primary-dark: #4F46E5;
  --color-accent: #2DD4BF;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.3);
  --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.4);
  --shadow-lg: 0 10px 25px -5px rgba(0,0,0,0.5);
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  font-size: 17px;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background var(--transition), color var(--transition);
  overflow-x: hidden;
}
img, svg, video { max-width: 100%; height: auto; display: block; }
a { color: var(--color-primary); text-decoration: none; transition: color var(--transition-fast); }
a:hover { color: var(--color-primary-dark); }
button { font-family: inherit; cursor: pointer; border: none; background: none; color: inherit; }
ul, ol { padding-left: 1.5rem; }
li { margin-bottom: var(--space-2); }

/* ---------- Layout ---------- */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-5);
}
.container-narrow {
  width: 100%;
  max-width: var(--container-narrow);
  margin: 0 auto;
  padding: 0 var(--space-5);
}

/* ---------- Header / Nav ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(250, 250, 249, 0.85);
  backdrop-filter: saturate(180%) blur(12px);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--border);
  height: var(--header-height);
}
[data-theme="dark"] .site-header { background: rgba(10, 10, 11, 0.85); }
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-height);
  gap: var(--space-5);
}
.brand {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-weight: 800;
  font-size: 1.15rem;
  color: var(--text);
  letter-spacing: -0.02em;
}
.brand:hover { color: var(--text); }
.brand-mark {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  display: grid;
  place-items: center;
  color: white;
  font-weight: 800;
  font-size: 0.95rem;
}
.brand-mark svg { width: 18px; height: 18px; }
.brand-name b { color: var(--color-primary); }

.nav-menu {
  display: flex;
  align-items: center;
  gap: var(--space-5);
  list-style: none;
  padding: 0;
  margin: 0;
}
.nav-menu a {
  color: var(--text-muted);
  font-weight: 500;
  font-size: 0.95rem;
  padding: var(--space-2) 0;
  position: relative;
}
.nav-menu a:hover { color: var(--text); }
.nav-menu a.active { color: var(--color-primary); }

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

.theme-toggle {
  width: 38px;
  height: 38px;
  border-radius: var(--radius-full);
  display: grid;
  place-items: center;
  background: var(--bg-subtle);
  color: var(--text-muted);
  transition: all var(--transition-fast);
}
.theme-toggle:hover { background: var(--border); color: var(--text); }
.theme-toggle svg { width: 18px; height: 18px; }
[data-theme="dark"] .theme-toggle .sun { display: block; }
[data-theme="dark"] .theme-toggle .moon { display: none; }
.theme-toggle .sun { display: none; }
.theme-toggle .moon { display: block; }

.nav-toggle {
  display: none;
  width: 38px;
  height: 38px;
  border-radius: var(--radius-md);
  background: var(--bg-subtle);
  color: var(--text);
  align-items: center;
  justify-content: center;
}
.nav-toggle svg { width: 22px; height: 22px; }

@media (max-width: 880px) {
  .nav-toggle { display: flex; }
  .nav-menu {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: var(--bg-elevated);
    flex-direction: column;
    align-items: stretch;
    padding: var(--space-4) var(--space-5);
    gap: var(--space-1);
    border-bottom: 1px solid var(--border);
    transform: translateY(-120%);
    transition: transform var(--transition);
    box-shadow: var(--shadow-lg);
  }
  .nav-menu.open { transform: translateY(0); }
  .nav-menu a { padding: var(--space-3); border-radius: var(--radius-md); }
  .nav-menu a:hover { background: var(--bg-subtle); }
}

/* ---------- Hero ---------- */
.hero {
  padding: var(--space-9) 0 var(--space-8);
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: '';
  position: absolute;
  top: -200px;
  right: -200px;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(79, 70, 229, 0.12), transparent 70%);
  pointer-events: none;
}
.hero::after {
  content: '';
  position: absolute;
  bottom: -200px;
  left: -200px;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(20, 184, 166, 0.10), transparent 70%);
  pointer-events: none;
}
.hero-inner { position: relative; z-index: 1; text-align: center; max-width: 760px; margin: 0 auto; }
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-full);
  background: var(--bg-subtle);
  border: 1px solid var(--border);
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-muted);
  margin-bottom: var(--space-5);
}
.hero-badge .dot { width: 8px; height: 8px; border-radius: 50%; background: var(--color-accent); box-shadow: 0 0 0 4px rgba(20,184,166,0.2); }
.hero h1 {
  font-size: clamp(2.2rem, 5vw, 3.5rem);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.03em;
  margin-bottom: var(--space-5);
}
.hero h1 .grad {
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.hero p.lead {
  font-size: clamp(1.05rem, 2vw, 1.25rem);
  color: var(--text-muted);
  margin-bottom: var(--space-6);
  max-width: 640px;
  margin-left: auto;
  margin-right: auto;
}
.hero-cta {
  display: flex;
  gap: var(--space-3);
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: var(--space-7);
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-5);
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 0.95rem;
  transition: all var(--transition-fast);
  text-decoration: none;
  border: 1px solid transparent;
  white-space: nowrap;
}
.btn-primary {
  background: var(--color-primary);
  color: var(--text-on-primary);
}
.btn-primary:hover {
  background: var(--color-primary-dark);
  color: var(--text-on-primary);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}
.btn-secondary {
  background: var(--bg-elevated);
  color: var(--text);
  border-color: var(--border-strong);
}
.btn-secondary:hover {
  background: var(--bg-subtle);
  border-color: var(--color-primary);
  color: var(--text);
}
.btn-ghost {
  color: var(--text-muted);
  padding: var(--space-2) var(--space-3);
}
.btn-ghost:hover { color: var(--color-primary); }
.btn svg { width: 18px; height: 18px; }

/* ---------- Stats Strip ---------- */
.stats-strip {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-5);
  padding: var(--space-6) 0;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  margin: var(--space-7) 0;
}
.stat { text-align: center; }
.stat-num {
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  font-weight: 800;
  color: var(--color-primary);
  letter-spacing: -0.02em;
  line-height: 1;
  margin-bottom: var(--space-2);
}
.stat-label { font-size: 0.85rem; color: var(--text-muted); }
@media (max-width: 640px) {
  .stats-strip { grid-template-columns: repeat(2, 1fr); gap: var(--space-5); }
}

/* ---------- Section ---------- */
.section { padding: var(--space-8) 0; }
.section-header { text-align: center; max-width: 680px; margin: 0 auto var(--space-7); }
.section-eyebrow {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-accent);
  margin-bottom: var(--space-3);
}
.section-title {
  font-size: clamp(1.7rem, 3vw, 2.4rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.15;
  margin-bottom: var(--space-3);
}
.section-subtitle {
  font-size: 1.05rem;
  color: var(--text-muted);
}

/* ---------- Card Grid ---------- */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-5);
}
.card {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  transition: all var(--transition);
  display: flex;
  flex-direction: column;
  height: 100%;
}
.card:hover {
  transform: translateY(-3px);
  border-color: var(--color-primary);
  box-shadow: var(--shadow-md);
}
.card-icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, rgba(79,70,229,0.1), rgba(20,184,166,0.1));
  display: grid;
  place-items: center;
  color: var(--color-primary);
  margin-bottom: var(--space-4);
}
.card-icon svg { width: 22px; height: 22px; }
.card h3 {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: var(--space-2);
  letter-spacing: -0.01em;
}
.card p { color: var(--text-muted); font-size: 0.95rem; margin-bottom: var(--space-4); flex-grow: 1; }
.card-link {
  font-weight: 600;
  font-size: 0.9rem;
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  color: var(--color-primary);
}
.card-link:hover { gap: var(--space-3); }

/* ---------- Article / Pillar Content ---------- */
.article {
  padding: var(--space-7) 0 var(--space-9);
}
.article-header {
  text-align: center;
  max-width: 760px;
  margin: 0 auto var(--space-7);
}
.article-eyebrow {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-accent);
  margin-bottom: var(--space-3);
}
.article-title {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.1;
  margin-bottom: var(--space-4);
}
.article-meta {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-4);
  color: var(--text-muted);
  font-size: 0.9rem;
  flex-wrap: wrap;
}
.article-meta span { display: inline-flex; align-items: center; gap: var(--space-2); }
.article-meta svg { width: 16px; height: 16px; }

.article-body {
  max-width: 760px;
  margin: 0 auto;
  font-size: 1.05rem;
  line-height: 1.8;
}
.article-body h2 {
  font-size: 1.7rem;
  font-weight: 700;
  margin: var(--space-7) 0 var(--space-4);
  letter-spacing: -0.02em;
  scroll-margin-top: 80px;
}
.article-body h3 {
  font-size: 1.3rem;
  font-weight: 700;
  margin: var(--space-6) 0 var(--space-3);
  letter-spacing: -0.01em;
}
.article-body h4 {
  font-size: 1.1rem;
  font-weight: 700;
  margin: var(--space-5) 0 var(--space-2);
}
.article-body p { margin-bottom: var(--space-5); }
.article-body ul, .article-body ol { margin-bottom: var(--space-5); }
.article-body li { margin-bottom: var(--space-2); }
.article-body strong { color: var(--text); font-weight: 700; }
.article-body a { text-decoration: underline; text-decoration-color: rgba(79,70,229,0.3); text-underline-offset: 3px; }
.article-body a:hover { text-decoration-color: var(--color-primary); }

.article-body blockquote {
  border-left: 4px solid var(--color-primary);
  padding: var(--space-4) var(--space-5);
  margin: var(--space-6) 0;
  background: var(--bg-subtle);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  color: var(--text-muted);
  font-style: italic;
}
.article-body blockquote p:last-child { margin-bottom: 0; }

.article-body code {
  font-family: var(--font-mono);
  font-size: 0.9em;
  background: var(--bg-code);
  padding: 0.15em 0.4em;
  border-radius: var(--radius-sm);
  color: var(--color-primary);
}
.article-body pre {
  background: var(--bg-code);
  padding: var(--space-4);
  border-radius: var(--radius-md);
  overflow-x: auto;
  margin-bottom: var(--space-5);
  border: 1px solid var(--border);
}
.article-body pre code { background: none; padding: 0; color: var(--text); }

.article-body table {
  width: 100%;
  border-collapse: collapse;
  margin: var(--space-5) 0;
  font-size: 0.95rem;
}
.article-body th, .article-body td {
  padding: var(--space-3) var(--space-4);
  text-align: left;
  border-bottom: 1px solid var(--border);
}
.article-body th { background: var(--bg-subtle); font-weight: 700; color: var(--text); }
.article-body tr:hover { background: var(--bg-subtle); }

/* ---------- Article Table of Contents ---------- */
.toc {
  background: var(--bg-subtle);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--space-5) var(--space-6);
  margin: var(--space-6) 0;
}
.toc-title {
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  margin-bottom: var(--space-3);
}
.toc ol { list-style: decimal; padding-left: 1.3rem; margin: 0; }
.toc ol li { margin-bottom: var(--space-2); font-size: 0.95rem; }
.toc a { color: var(--text-muted); }
.toc a:hover { color: var(--color-primary); }

/* ---------- Callout ---------- */
.callout {
  display: flex;
  gap: var(--space-4);
  padding: var(--space-5);
  border-radius: var(--radius-lg);
  margin: var(--space-6) 0;
  border: 1px solid var(--border);
  background: var(--bg-subtle);
}
.callout-icon { flex-shrink: 0; color: var(--color-primary); }
.callout-icon svg { width: 22px; height: 22px; }
.callout-body { flex-grow: 1; }
.callout-title { font-weight: 700; margin-bottom: var(--space-2); }
.callout-body p:last-child { margin-bottom: 0; }
.callout.tip { border-color: rgba(20,184,166,0.3); background: rgba(20,184,166,0.06); }
.callout.warning { border-color: rgba(245,158,11,0.3); background: rgba(245,158,11,0.06); }
.callout.warning .callout-icon { color: var(--color-warning); }
.callout.danger { border-color: rgba(239,68,68,0.3); background: rgba(239,68,68,0.06); }
.callout.danger .callout-icon { color: var(--color-danger); }

/* ---------- Comparison Table ---------- */
.compare-table-wrap {
  overflow-x: auto;
  margin: var(--space-6) 0;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
}
.compare-table {
  width: 100%;
  border-collapse: collapse;
  min-width: 640px;
}
.compare-table th, .compare-table td {
  padding: var(--space-4);
  text-align: left;
  border-bottom: 1px solid var(--border);
  font-size: 0.95rem;
  vertical-align: top;
}
.compare-table thead th {
  background: var(--bg-subtle);
  font-weight: 700;
  position: sticky;
  top: 0;
}
.compare-table tbody tr:hover { background: var(--bg-subtle); }
.compare-table .check { color: var(--color-success); font-weight: 700; }
.compare-table .cross { color: var(--color-danger); font-weight: 700; }

/* ---------- FAQ ---------- */
.faq-list { max-width: 760px; margin: 0 auto; }
.faq-item {
  border-bottom: 1px solid var(--border);
  padding: var(--space-4) 0;
}
.faq-item summary {
  font-weight: 600;
  font-size: 1.05rem;
  cursor: pointer;
  padding: var(--space-2) 0;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-3);
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after {
  content: '+';
  font-size: 1.4rem;
  color: var(--color-primary);
  font-weight: 300;
  transition: transform var(--transition);
}
.faq-item[open] summary::after { transform: rotate(45deg); }
.faq-item p { color: var(--text-muted); margin-top: var(--space-3); padding-right: var(--space-6); }

/* ---------- CTA Banner ---------- */
.cta-banner {
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
  color: white;
  border-radius: var(--radius-xl);
  padding: var(--space-8) var(--space-7);
  text-align: center;
  margin: var(--space-8) 0;
  position: relative;
  overflow: hidden;
}
.cta-banner::before {
  content: '';
  position: absolute;
  top: -100px;
  right: -100px;
  width: 300px;
  height: 300px;
  background: radial-gradient(circle, rgba(255,255,255,0.15), transparent 70%);
}
.cta-banner h2 {
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  font-weight: 800;
  margin-bottom: var(--space-3);
  letter-spacing: -0.02em;
}
.cta-banner p { opacity: 0.9; margin-bottom: var(--space-5); max-width: 540px; margin-left: auto; margin-right: auto; }
.cta-banner .btn-primary { background: white; color: var(--color-primary); }
.cta-banner .btn-primary:hover { background: var(--bg-subtle); }

/* ---------- Related Links ---------- */
.related {
  background: var(--bg-subtle);
  padding: var(--space-7) 0;
  margin-top: var(--space-8);
  border-top: 1px solid var(--border);
}
.related-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: var(--space-4);
  margin-top: var(--space-5);
}
.related-card {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: var(--space-4);
  transition: all var(--transition-fast);
  display: block;
  color: var(--text);
}
.related-card:hover {
  border-color: var(--color-primary);
  transform: translateY(-2px);
  color: var(--text);
}
.related-card .label { font-size: 0.75rem; color: var(--color-accent); font-weight: 700; text-transform: uppercase; letter-spacing: 0.08em; }
.related-card .title { font-weight: 600; margin-top: var(--space-2); }

/* ---------- Breadcrumbs ---------- */
.breadcrumbs {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: var(--space-4);
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-2);
}
.breadcrumbs a { color: var(--text-muted); }
.breadcrumbs a:hover { color: var(--color-primary); }
.breadcrumbs .sep { color: var(--text-subtle); }
.breadcrumbs .current { color: var(--text); font-weight: 500; }

/* ---------- Footer ---------- */
.site-footer {
  background: var(--bg-elevated);
  border-top: 1px solid var(--border);
  padding: var(--space-8) 0 var(--space-5);
  margin-top: var(--space-9);
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr repeat(4, 1fr);
  gap: var(--space-6);
  margin-bottom: var(--space-7);
}
@media (max-width: 880px) {
  .footer-grid { grid-template-columns: 1fr 1fr; gap: var(--space-6); }
}
@media (max-width: 520px) {
  .footer-grid { grid-template-columns: 1fr; }
}
.footer-brand .brand { margin-bottom: var(--space-3); }
.footer-brand p { color: var(--text-muted); font-size: 0.9rem; max-width: 280px; }
.footer-col h4 {
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  margin-bottom: var(--space-3);
}
.footer-col ul { list-style: none; padding: 0; }
.footer-col li { margin-bottom: var(--space-2); }
.footer-col a { color: var(--text-muted); font-size: 0.9rem; }
.footer-col a:hover { color: var(--color-primary); }
.footer-bottom {
  border-top: 1px solid var(--border);
  padding-top: var(--space-5);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-4);
  flex-wrap: wrap;
  font-size: 0.85rem;
  color: var(--text-muted);
}
.footer-bottom a { color: var(--text-muted); }
.footer-bottom a:hover { color: var(--color-primary); }

/* ---------- (ad slots removed) ---------- */

/* ---------- Pillar Hub Cards ---------- */
.pillar-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-5);
  margin: var(--space-6) 0;
}
.pillar-card {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all var(--transition);
  display: flex;
  flex-direction: column;
}
.pillar-card:hover {
  transform: translateY(-4px);
  border-color: var(--color-primary);
  box-shadow: var(--shadow-lg);
}
.pillar-card-banner {
  height: 8px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
}
.pillar-card-body { padding: var(--space-5); flex-grow: 1; display: flex; flex-direction: column; }
.pillar-card h3 { font-size: 1.25rem; margin-bottom: var(--space-2); font-weight: 700; }
.pillar-card p { color: var(--text-muted); margin-bottom: var(--space-4); font-size: 0.95rem; flex-grow: 1; }
.pillar-card .meta {
  display: flex;
  gap: var(--space-4);
  font-size: 0.8rem;
  color: var(--text-subtle);
  padding-top: var(--space-3);
  border-top: 1px solid var(--border);
}

/* ---------- Hero Visual (homepage) ---------- */
.hero-visual {
  margin-top: var(--space-7);
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: var(--space-5);
  box-shadow: var(--shadow-lg);
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
}
.hero-visual-bar {
  display: flex;
  gap: var(--space-2);
  padding-bottom: var(--space-4);
  border-bottom: 1px solid var(--border);
  margin-bottom: var(--space-4);
}
.hero-visual-bar .dot { width: 10px; height: 10px; border-radius: 50%; background: var(--border-strong); }
.hero-visual-bar .dot:nth-child(1) { background: #FF5F57; }
.hero-visual-bar .dot:nth-child(2) { background: #FEBC2E; }
.hero-visual-bar .dot:nth-child(3) { background: #28C840; }
.hero-visual-content {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  line-height: 1.6;
  color: var(--text-muted);
  text-align: left;
  padding: var(--space-2);
}
.hero-visual-content .line { display: block; }
.hero-visual-content .tag { color: var(--color-accent); }
.hero-visual-content .str { color: var(--color-primary); }
.hero-visual-content .com { color: var(--text-subtle); }

/* ---------- Skip link ---------- */
.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--color-primary);
  color: white;
  padding: var(--space-3) var(--space-4);
  border-radius: 0 0 var(--radius-md) 0;
  z-index: 200;
}
.skip-link:focus { left: 0; }

/* ---------- Utility ---------- */
.text-center { text-align: center; }
.mt-0 { margin-top: 0; }
.mt-4 { margin-top: var(--space-4); }
.mt-6 { margin-top: var(--space-6); }
.mt-8 { margin-top: var(--space-8); }
.mb-0 { margin-bottom: 0; }
.hide-mobile { display: initial; }
.show-mobile { display: none; }
@media (max-width: 640px) {
  .hide-mobile { display: none; }
  .show-mobile { display: initial; }
}

/* ---------- Print ---------- */
@media print {
  .site-header, .site-footer, .cta-banner, .nav-toggle, .theme-toggle { display: none; }
  body { color: black; background: white; }
}

/* ---------- Accessibility ---------- */
:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
  border-radius: 4px;
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}