:root {
  --bg-deep: #050811;
  --bg-navy: #0a1020;
  --bg-surface: #0f172a;
  --bg-card: rgba(15, 23, 42, 0.78);
  --bg-card-solid: #111c33;
  --bg-card-hover: #162442;
  --bg-light: #f8fafc;
  --bg-light-alt: #eef2f6;
  --primary: #0284c7;
  --primary-bright: #38bdf8;
  --primary-glow: rgba(56, 189, 248, 0.22);
  --gold: #f5b82e;
  --gold-bright: #fde047;
  --gold-dark: #d99216;
  --gold-glow: rgba(245, 184, 46, 0.2);
  --emerald: #10b981;
  --emerald-soft: rgba(16, 185, 129, 0.14);
  --rose: #f43f5e;
  --rose-soft: rgba(244, 63, 94, 0.14);
  --text-white: #f8fafc;
  --text-slate: #cbd5e1;
  --text-muted: #94a3b8;
  --text-dark: #0f172a;
  --text-dark-muted: #475569;
  --border-dark: rgba(148, 163, 184, 0.16);
  --border-glow: rgba(56, 189, 248, 0.38);
  --border-light: #cbd5e1;
  --radius-sm: 0.5rem;
  --radius-md: 0.875rem;
  --radius-lg: 1.25rem;
  --radius-xl: 1.5rem;
  --shadow-card: 0 16px 40px rgba(2, 6, 23, 0.45);
  --shadow-light: 0 12px 32px rgba(15, 23, 42, 0.07);
  --font-sans: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-display: 'Space Grotesk', 'Inter', system-ui, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-deep);
  color: var(--text-white);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  line-height: 1.18;
  letter-spacing: -0.02em;
}

a {
  color: inherit;
  text-decoration: none;
}

a:focus-visible,
button:focus-visible,
summary:focus-visible,
input:focus-visible {
  outline: 3px solid var(--gold);
  outline-offset: 2px;
}

.skip-link {
  position: absolute;
  top: -100px;
  left: 1rem;
  background: var(--gold);
  color: var(--bg-deep);
  font-weight: 700;
  padding: 0.6rem 1rem;
  border-radius: var(--radius-sm);
  z-index: 999;
}

.skip-link:focus {
  top: 1rem;
}

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.25rem;
}

/* Navbar */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(5, 8, 17, 0.88);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-dark);
}

.navbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 4.25rem;
  gap: 0.75rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.18rem;
  color: var(--text-white);
  white-space: nowrap;
  flex-shrink: 0;
}

.brand-mark {
  width: 2.15rem;
  height: 2.15rem;
  border-radius: 0.55rem;
  background: linear-gradient(135deg, var(--primary-bright), var(--primary));
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--bg-deep);
  font-weight: 900;
  font-size: 1.1rem;
  box-shadow: 0 0 22px rgba(56, 189, 248, 0.4);
}

.brand-accent {
  color: var(--primary-bright);
}

.brand-sub {
  font-size: 0.74rem;
  font-weight: 600;
  color: var(--gold);
  padding: 0.15rem 0.55rem;
  border-radius: 999px;
  background: rgba(245, 184, 46, 0.12);
  border: 1px solid rgba(245, 184, 46, 0.28);
  display: none;
}

.nav-links {
  display: none;
  align-items: center;
  gap: 1.6rem;
  list-style: none;
}

.nav-links a {
  color: var(--text-slate);
  font-size: 0.92rem;
  font-weight: 600;
  transition: color 0.18s ease;
}

.nav-links a:hover {
  color: var(--primary-bright);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.7rem 1.25rem;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.92rem;
  transition: all 0.18s ease;
  cursor: pointer;
  border: 1px solid transparent;
  text-align: center;
}

.nav-actions .btn {
  padding: 0.5rem 0.9rem;
  font-size: 0.84rem;
  white-space: nowrap;
}

.btn-primary {
  background: linear-gradient(135deg, #0ea5e9, var(--primary));
  color: #ffffff;
  box-shadow: 0 6px 20px rgba(2, 132, 199, 0.35);
}

.btn-primary:hover {
  filter: brightness(1.08);
  transform: translateY(-1px);
}

.btn-gold {
  background: linear-gradient(135deg, var(--gold-bright), var(--gold), var(--gold-dark));
  color: var(--bg-deep);
  font-weight: 700;
  box-shadow: 0 6px 25px rgba(245, 184, 46, 0.3);
}

.btn-gold:hover {
  filter: brightness(1.06);
  transform: translateY(-1px);
}

.btn-outline-light {
  border-color: rgba(148, 163, 184, 0.32);
  color: var(--text-white);
  background: rgba(255, 255, 255, 0.04);
}

.btn-outline-light:hover {
  border-color: var(--primary-bright);
  color: var(--primary-bright);
  background: rgba(56, 189, 248, 0.08);
}

.btn-outline {
  border-color: var(--primary);
  color: var(--primary);
  background: transparent;
}

.btn-outline:hover {
  background: rgba(2, 132, 199, 0.08);
}

/* Hero Section with AI Grid Background */
.hero {
  position: relative;
  padding: 3.5rem 0 4.5rem;
  background:
    radial-gradient(circle at 18% 18%, rgba(56, 189, 248, 0.16) 0%, transparent 42%),
    radial-gradient(circle at 82% 25%, rgba(245, 184, 46, 0.12) 0%, transparent 40%),
    linear-gradient(180deg, var(--bg-deep) 0%, var(--bg-navy) 60%, #0d162c 100%);
  border-bottom: 1px solid var(--border-dark);
  overflow: hidden;
}

.hero-bg-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(56, 189, 248, 0.05) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(56, 189, 248, 0.05) 1px, transparent 1px);
  background-size: 44px 44px;
  mask-image: radial-gradient(ellipse at center, rgba(0, 0, 0, 0.85) 20%, transparent 80%);
  -webkit-mask-image: radial-gradient(ellipse at center, rgba(0, 0, 0, 0.85) 20%, transparent 80%);
  pointer-events: none;
}

.hero-layout {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.5rem;
  align-items: center;
}

.ai-status-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  padding: 0.4rem 0.95rem;
  border-radius: 999px;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  background: rgba(56, 189, 248, 0.1);
  border: 1px solid rgba(56, 189, 248, 0.32);
  color: var(--primary-bright);
  margin-bottom: 1.25rem;
}

.pulse-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--emerald);
  box-shadow: 0 0 10px var(--emerald);
}

.hero h1 {
  font-size: clamp(2rem, 4.2vw, 3.25rem);
  font-weight: 800;
  color: #ffffff;
  margin-bottom: 1.15rem;
}

.gold-text {
  background: linear-gradient(135deg, var(--gold-bright) 0%, var(--gold) 55%, #ea9a15 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.cyan-text {
  background: linear-gradient(135deg, #7dd3fc 0%, var(--primary-bright) 55%, #0284c7 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-lead {
  font-size: clamp(1rem, 1.8vw, 1.15rem);
  color: var(--text-slate);
  margin-bottom: 1.75rem;
  max-width: 640px;
}

.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 2rem;
}

.hero-metrics {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.75rem;
}

.metric-chip {
  background: rgba(15, 23, 42, 0.75);
  border: 1px solid var(--border-dark);
  border-radius: var(--radius-sm);
  padding: 0.75rem 0.9rem;
}

.metric-chip strong {
  display: block;
  font-family: var(--font-display);
  font-size: 1.35rem;
  color: var(--gold);
  line-height: 1.1;
}

.metric-chip span {
  font-size: 0.78rem;
  color: var(--text-muted);
}

/* Interactive AI Terminal / Chat Simulator */
.ai-console {
  background: rgba(10, 16, 32, 0.92);
  border: 1px solid var(--border-glow);
  border-radius: var(--radius-lg);
  box-shadow: 0 24px 60px rgba(2, 132, 199, 0.18), var(--shadow-card);
  overflow: hidden;
  min-width: 0;
}

.ai-console-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 1rem;
  background: rgba(15, 23, 42, 0.95);
  border-bottom: 1px solid var(--border-dark);
  gap: 0.5rem;
  flex-wrap: wrap;
}

.console-dots {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

.console-dots span {
  width: 9px;
  height: 9px;
  border-radius: 50%;
}

.console-dots span:nth-child(1) { background: #ef4444; }
.console-dots span:nth-child(2) { background: #f59e0b; }
.console-dots span:nth-child(3) { background: #10b981; }

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

.console-tabs {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border-bottom: 1px solid var(--border-dark);
  background: rgba(5, 8, 17, 0.6);
}

.console-tab {
  background: transparent;
  border: none;
  border-bottom: 2px solid transparent;
  color: var(--text-muted);
  font-family: var(--font-sans);
  font-size: 0.74rem;
  font-weight: 600;
  padding: 0.65rem 0.4rem;
  cursor: pointer;
  text-align: center;
  line-height: 1.25;
  transition: all 0.15s ease;
}

.console-tab:hover {
  color: var(--text-white);
}

.console-tab.active {
  color: var(--primary-bright);
  border-bottom-color: var(--primary-bright);
  background: rgba(56, 189, 248, 0.08);
}

.console-panel {
  display: none;
  padding: 1.15rem;
  font-size: 0.85rem;
}

.console-panel.active {
  display: block;
}

.chat-bubble-user {
  background: rgba(56, 189, 248, 0.12);
  border: 1px solid rgba(56, 189, 248, 0.28);
  color: var(--text-white);
  padding: 0.7rem 0.9rem;
  border-radius: 0.75rem 0.75rem 0.2rem 0.75rem;
  margin-bottom: 0.85rem;
}

.chat-role {
  display: block;
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--primary-bright);
  margin-bottom: 0.2rem;
}

.chat-tool-call {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  background: rgba(5, 8, 17, 0.85);
  border-left: 3px solid var(--gold);
  padding: 0.55rem 0.75rem;
  border-radius: 0.35rem;
  color: #e2e8f0;
  margin-bottom: 0.85rem;
}

.chat-tool-call span {
  color: var(--gold);
  font-weight: 700;
}

.chat-bubble-ai {
  background: rgba(16, 185, 129, 0.09);
  border: 1px solid rgba(16, 185, 129, 0.28);
  color: #e2e8f0;
  padding: 0.8rem 0.95rem;
  border-radius: 0.75rem 0.75rem 0.75rem 0.2rem;
}

.chat-bubble-ai .chat-role {
  color: #34d399;
}

/* 4 Pillars Bar */
.pillars-section {
  padding: 3rem 0;
  background: #080d1a;
  border-bottom: 1px solid var(--border-dark);
}

.pillars-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}

.pillar-card {
  background: var(--bg-card-solid);
  border: 1px solid var(--border-dark);
  border-radius: var(--radius-md);
  padding: 1.35rem;
  transition: border-color 0.2s ease, transform 0.2s ease;
}

.pillar-card:hover {
  border-color: var(--primary-bright);
  transform: translateY(-2px);
}

.pillar-tag {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--gold);
  margin-bottom: 0.4rem;
}

.pillar-card h2 {
  font-size: 1.15rem;
  color: #ffffff;
  margin-bottom: 0.45rem;
}

.pillar-card p {
  font-size: 0.9rem;
  color: var(--text-slate);
}

/* Why Deterministic AI Section */
.section {
  padding: 4.5rem 0;
}

.section-dark-alt {
  background: linear-gradient(180deg, var(--bg-navy) 0%, var(--bg-deep) 100%);
  border-bottom: 1px solid var(--border-dark);
}

.section-light {
  background: var(--bg-light);
  color: var(--text-dark);
  border-bottom: 1px solid var(--border-light);
}

.section-light-alt {
  background: var(--bg-light-alt);
  color: var(--text-dark);
  border-bottom: 1px solid var(--border-light);
}

.section-header {
  max-width: 780px;
  margin: 0 auto 3rem;
  text-align: center;
}

.section-badge {
  display: inline-block;
  font-size: 0.76rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--primary-bright);
  background: rgba(56, 189, 248, 0.12);
  border: 1px solid rgba(56, 189, 248, 0.28);
  padding: 0.35rem 0.9rem;
  border-radius: 999px;
  margin-bottom: 0.85rem;
}

.section-light .section-badge,
.section-light-alt .section-badge {
  color: var(--primary);
  background: rgba(2, 132, 199, 0.1);
  border-color: rgba(2, 132, 199, 0.24);
}

.section-header h2 {
  font-size: clamp(1.75rem, 3.4vw, 2.5rem);
  margin-bottom: 0.85rem;
}

.section-header p {
  font-size: 1.04rem;
  color: var(--text-slate);
}

.section-light .section-header p,
.section-light-alt .section-header p {
  color: var(--text-dark-muted);
}

/* Comparison Grid: Generic AI vs Zatha AI */
.compare-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}

.compare-card {
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  border: 1px solid var(--border-dark);
}

.compare-bad {
  background: rgba(244, 63, 94, 0.05);
  border-color: rgba(244, 63, 94, 0.28);
}

.compare-good {
  background: linear-gradient(145deg, rgba(16, 185, 129, 0.08), rgba(2, 132, 199, 0.1));
  border-color: rgba(16, 185, 129, 0.4);
  box-shadow: 0 12px 35px rgba(16, 185, 129, 0.08);
}

.compare-card h3 {
  font-size: 1.3rem;
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.compare-list {
  list-style: none;
  display: grid;
  gap: 0.7rem;
  font-size: 0.94rem;
  color: var(--text-slate);
}

.compare-list li {
  display: flex;
  align-items: flex-start;
  gap: 0.6rem;
}

/* Systems Stack */
.systems-stack {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.system-card {
  background: #ffffff;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 1.5rem 1.25rem;
  box-shadow: var(--shadow-light);
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
  align-items: center;
  min-width: 0;
  overflow: hidden;
}

.system-content {
  min-width: 0;
}

.system-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.6rem;
  margin-bottom: 0.75rem;
}

.badge-status {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.76rem;
  font-weight: 700;
  padding: 0.25rem 0.7rem;
  border-radius: 999px;
}

.badge-public {
  background: #dcfce7;
  color: #15803d;
}

.badge-client {
  background: #fef3c7;
  color: #92400e;
}

.badge-ai-role {
  background: #e0f2fe;
  color: #0369a1;
}

.system-domain {
  font-size: 0.84rem;
  font-weight: 700;
  color: var(--primary);
  font-family: var(--font-mono);
}

.system-content h3 {
  font-size: 1.65rem;
  color: var(--text-dark);
  margin-bottom: 0.6rem;
}

.system-content p {
  color: var(--text-dark-muted);
  margin-bottom: 1rem;
  font-size: 0.98rem;
}

.system-features {
  list-style: none;
  margin-bottom: 1.25rem;
  display: grid;
  gap: 0.45rem;
}

.system-features li {
  display: flex;
  align-items: flex-start;
  gap: 0.55rem;
  font-size: 0.93rem;
  color: var(--text-dark);
}

.system-features li::before {
  content: "✓";
  color: var(--primary);
  font-weight: 800;
  flex-shrink: 0;
}

.system-access-note {
  font-size: 0.84rem;
  color: var(--text-dark-muted);
  background: #f1f5f9;
  border: 1px solid #e2e8f0;
  padding: 0.65rem 0.9rem;
  border-radius: var(--radius-sm);
  margin-bottom: 1.2rem;
}

.system-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.system-visual {
  background: linear-gradient(145deg, var(--bg-deep), #111c35);
  border-radius: var(--radius-md);
  padding: 1.15rem;
  color: var(--text-white);
  border: 1px solid rgba(56, 189, 248, 0.25);
  min-width: 0;
  max-width: 100%;
  overflow-x: auto;
}

.phone-pair {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.75rem;
  align-items: center;
}

.phone-pair img {
  width: 100%;
  max-height: 290px;
  object-fit: contain;
  border-radius: 0.75rem;
}

.ui-preview {
  font-size: 0.8rem;
}

.ui-preview-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 0.6rem;
  margin-bottom: 0.8rem;
  border-bottom: 1px solid rgba(148, 163, 184, 0.2);
  font-size: 0.74rem;
  color: #94a3b8;
}

.ui-dots {
  display: inline-flex;
  gap: 0.3rem;
}

.ui-dots span {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: rgba(148, 163, 184, 0.45);
}

.ui-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 0.45rem;
}

.ui-table th,
.ui-table td {
  text-align: left;
  padding: 0.42rem 0.48rem;
  border-bottom: 1px solid rgba(148, 163, 184, 0.14);
}

.ui-table th {
  color: var(--primary-bright);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.ui-badge-ok {
  background: rgba(34, 197, 94, 0.2);
  color: #86efac;
  padding: 0.1rem 0.45rem;
  border-radius: 4px;
  font-weight: 700;
  font-size: 0.68rem;
}

.ui-badge-warn {
  background: rgba(245, 184, 46, 0.2);
  color: #fde047;
  padding: 0.1rem 0.45rem;
  border-radius: 4px;
  font-weight: 700;
  font-size: 0.68rem;
}

/* MCP Architecture Diagram & Cards */
.mcp-flow-banner {
  background: rgba(15, 23, 42, 0.85);
  border: 1px solid var(--border-glow);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  margin-bottom: 2.25rem;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
  align-items: center;
  text-align: center;
}

.mcp-flow-step {
  background: rgba(5, 8, 17, 0.7);
  border: 1px solid var(--border-dark);
  border-radius: var(--radius-md);
  padding: 1rem;
}

.mcp-flow-step strong {
  display: block;
  color: var(--gold);
  font-size: 0.95rem;
  margin-bottom: 0.25rem;
}

.mcp-flow-step span {
  font-size: 0.84rem;
  color: var(--text-slate);
}

.mcp-flow-arrow {
  font-family: var(--font-mono);
  color: var(--primary-bright);
  font-weight: 700;
  font-size: 0.9rem;
}

.mcp-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}

.mcp-card {
  background: var(--bg-card-solid);
  border: 1px solid var(--border-dark);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 1.25rem;
  transition: border-color 0.2s ease, transform 0.2s ease;
}

.mcp-card:hover {
  border-color: var(--primary-bright);
  transform: translateY(-3px);
}

.mcp-top h3 {
  font-size: 1.38rem;
  color: #ffffff;
  margin: 0.45rem 0 0.65rem;
}

.mcp-top p {
  color: var(--text-slate);
  font-size: 0.94rem;
  margin-bottom: 1rem;
}

.mcp-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-bottom: 0.75rem;
}

.mcp-tag {
  font-size: 0.72rem;
  font-weight: 600;
  padding: 0.2rem 0.55rem;
  border-radius: 4px;
  background: rgba(56, 189, 248, 0.12);
  color: var(--primary-bright);
}

.mcp-endpoint {
  background: rgba(5, 8, 17, 0.65);
  border: 1px solid var(--border-dark);
  border-radius: var(--radius-sm);
  padding: 0.75rem 0.9rem;
  font-size: 0.82rem;
  color: var(--text-slate);
  margin-bottom: 1rem;
}

/* Skills Section */
.explainer-box {
  background: #ffffff;
  border: 1px solid var(--border-light);
  border-left: 5px solid var(--primary);
  border-radius: var(--radius-md);
  padding: 1.35rem 1.5rem;
  margin-bottom: 2rem;
  box-shadow: var(--shadow-light);
  color: var(--text-dark-muted);
}

.explainer-box strong {
  color: var(--text-dark);
}

.skills-toolbar {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-bottom: 1.5rem;
}

.skills-search {
  width: 100%;
  padding: 0.85rem 1.1rem;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  font-size: 0.96rem;
  font-family: var(--font-sans);
  background: #ffffff;
  color: var(--text-dark);
  box-shadow: 0 2px 6px rgba(15, 23, 42, 0.04);
}

.skills-toolbar-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  align-items: center;
  justify-content: space-between;
}

.skills-count {
  font-size: 0.88rem;
  color: var(--text-dark-muted);
  font-weight: 600;
}

.skill-group {
  background: #ffffff;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  margin-bottom: 1.15rem;
  box-shadow: 0 2px 10px rgba(15, 23, 42, 0.04);
  overflow: hidden;
}

.skill-group summary {
  list-style: none;
  cursor: pointer;
  padding: 1.2rem 1.4rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  background: #ffffff;
  transition: background-color 0.15s ease;
}

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

.skill-group summary:hover {
  background: #f8fafc;
}

.skill-group-title {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.skill-group-title h3 {
  font-size: 1.18rem;
  color: var(--text-dark);
  display: flex;
  align-items: center;
  gap: 0.6rem;
  flex-wrap: wrap;
}

.skill-group-title p {
  font-size: 0.9rem;
  color: var(--text-dark-muted);
  font-weight: 400;
}

.count-pill {
  font-size: 0.74rem;
  font-weight: 700;
  background: rgba(2, 132, 199, 0.1);
  color: var(--primary);
  padding: 0.2rem 0.65rem;
  border-radius: 999px;
}

.group-chevron {
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--primary);
  white-space: nowrap;
  padding: 0.35rem 0.75rem;
  border-radius: var(--radius-sm);
  background: rgba(2, 132, 199, 0.1);
}

.skill-group[open] .group-chevron::after {
  content: " ▲";
}

.skill-group:not([open]) .group-chevron::after {
  content: " ▼";
}

.skill-group-body {
  padding: 0 1.4rem 1.4rem;
  border-top: 1px solid #e2e8f0;
}

.audit-banner {
  margin-top: 1rem;
  padding: 0.8rem 1rem;
  border-radius: var(--radius-sm);
  background: #eff6ff;
  border: 1px solid #bfdbfe;
  color: #1e3a8a;
  font-size: 0.88rem;
}

.skills-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.85rem;
  margin-top: 1.05rem;
}

.skill-card {
  background: #f8fafc;
  border: 1px solid #e2e8f0;
  border-radius: var(--radius-sm);
  padding: 0.95rem 1.05rem;
  transition: border-color 0.15s ease, background-color 0.15s ease;
}

.skill-card:hover {
  border-color: var(--primary);
  background: #ffffff;
}

.skill-card-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  margin-bottom: 0.35rem;
  flex-wrap: wrap;
}

.skill-card h4 {
  font-size: 0.98rem;
  color: var(--text-dark);
}

.skill-code {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--primary);
  background: rgba(2, 132, 199, 0.09);
  padding: 0.15rem 0.45rem;
  border-radius: 4px;
}

.skill-card p {
  font-size: 0.88rem;
  color: var(--text-dark-muted);
  line-height: 1.48;
}

/* Contact CTA Section */
.cta-box {
  background: linear-gradient(135deg, #091124 0%, #10203d 100%);
  color: var(--text-white);
  border-radius: var(--radius-xl);
  padding: 2.75rem 1.5rem;
  text-align: center;
  border: 1px solid rgba(245, 184, 46, 0.4);
  box-shadow: var(--shadow-card);
}

.cta-box h2 {
  font-size: clamp(1.65rem, 3vw, 2.3rem);
  color: #ffffff;
  margin-bottom: 0.75rem;
}

.cta-box p {
  color: var(--text-slate);
  max-width: 660px;
  margin: 0 auto 1.75rem;
  font-size: 1.02rem;
}

.contact-cards {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
  max-width: 820px;
  margin: 2rem auto 0;
  text-align: left;
}

.contact-item {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-dark);
  border-radius: var(--radius-sm);
  padding: 1rem 1.15rem;
}

.contact-item span {
  display: block;
  font-size: 0.74rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--gold);
  font-weight: 700;
  margin-bottom: 0.2rem;
}

.contact-item a {
  color: #ffffff;
  font-size: 0.96rem;
  font-weight: 600;
}

.contact-item a:hover {
  color: var(--primary-bright);
  text-decoration: underline;
}

/* Footer */
.footer {
  background: var(--bg-deep);
  color: var(--text-muted);
  padding: 2.5rem 0;
  border-top: 1px solid var(--border-dark);
  font-size: 0.86rem;
}

.footer-inner {
  display: flex;
  flex-direction: column;
  gap: 1.2rem;
  text-align: center;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1.25rem;
}

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

.footer address {
  font-style: normal;
  line-height: 1.6;
  color: #64748b;
  font-size: 0.8rem;
}

.privacy-note {
  display: inline-block;
  margin-top: 0.35rem;
  font-size: 0.76rem;
  color: #94a3b8;
}

@media (min-width: 640px) {
  .hero-metrics {
    grid-template-columns: repeat(4, 1fr);
  }
  .pillars-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .compare-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .skills-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .contact-cards {
    grid-template-columns: repeat(3, 1fr);
  }
  .skills-toolbar {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }
  .skills-search {
    max-width: 420px;
  }
}

@media (min-width: 960px) {
  .brand-sub {
    display: inline-block;
  }
  .nav-links {
    display: flex;
  }
  .hero-layout {
    grid-template-columns: 1.08fr 0.92fr;
  }
  .pillars-grid {
    grid-template-columns: repeat(4, 1fr);
  }
  .system-card {
    grid-template-columns: 1.15fr 0.85fr;
    padding: 2.15rem;
  }
  .mcp-flow-banner {
    grid-template-columns: 1fr auto 1fr auto 1fr;
  }
  .mcp-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  .skills-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}