:root {
  --color-bg: #050B18;
  --color-bg-elevated: rgba(11, 19, 38, 0.4);
  --color-bg-soft: #0c162b;
  --color-border: rgba(34, 52, 82, 0.6);
  --color-border-active: #20D6FF;
  
  --color-cyan: #00E5D4;
  --color-blue: #318CFF;
  --color-violet: #9B5CFF;
  --color-purple: #C85BFF;
  --color-green: #00E575;
  --color-yellow: #FFB000;
  --color-red: #FF3B3B;

  --color-text: #F3F4F6;
  --color-text-muted: #9CA3AF;
  --color-text-soft: #8F9AA9; /* Contrast increased to 4.8:1 to pass WCAG AA */

  --font-display: 'Outfit', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-mono: 'Fira Code', monospace;

  --gradient-primary: linear-gradient(135deg, #00E5D4 0%, #318CFF 50%, #9B5CFF 100%);
  --gradient-secondary: linear-gradient(135deg, #318CFF 0%, #9B5CFF 100%);
  --gradient-glow: radial-gradient(circle, rgba(49, 140, 255, 0.15) 0%, rgba(5, 11, 24, 0) 70%);
}

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

body {
  background-color: var(--color-bg);
  background-image: radial-gradient(circle at top, #0f2042 0%, #050b18 100%);
  color: var(--color-text);
  font-family: var(--font-sans);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

/* Accessibility Utilities */
.skip-link {
  position: absolute;
  top: -100px;
  left: 20px;
  background: var(--color-cyan);
  color: #050B18;
  padding: 10px 20px;
  border-radius: 4px;
  font-weight: 700;
  z-index: 2000;
  transition: top 0.2s ease;
  font-size: 14px;
}

.skip-link:focus-visible {
  top: 20px;
  outline: 2px solid var(--color-blue);
  outline-offset: 2px;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

a:focus-visible,
button:focus-visible,
[tabindex="0"]:focus-visible {
  outline: 3px solid var(--color-cyan);
  outline-offset: 4px;
}

/* Typography */
h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: -0.02em;
}

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

a:hover {
  color: var(--color-text);
}

/* Glassmorphism Panel base */
.glass-panel {
  background: var(--color-bg-elevated);
  border: 1px solid var(--color-border);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-radius: 12px;
  box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.37);
  transition: border-color 0.3s cubic-bezier(0.4, 0, 0.2, 1), 
              box-shadow 0.3s cubic-bezier(0.4, 0, 0.2, 1),
              transform 0.3s cubic-bezier(0.4, 0, 0.2, 1),
              background 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  will-change: transform, box-shadow, border-color;
}

.glass-panel:hover {
  border-color: rgba(0, 229, 212, 0.4);
  box-shadow: 0 12px 40px 0 rgba(0, 229, 212, 0.08);
  transform: translateY(-2px);
  background: rgba(11, 19, 38, 0.55);
}

/* Header & Nav */
header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 70px;
  background: rgba(5, 11, 24, 0.7);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 40px;
}

.header-left {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand-title {
  font-family: var(--font-display);
  color: var(--color-text);
}

nav {
  display: flex;
  align-items: center;
  gap: 30px;
}

nav a {
  color: var(--color-text-muted);
  font-size: 14px;
  font-weight: 500;
  transition: color 0.2s ease;
  position: relative;
}

nav a:hover {
  color: var(--color-text);
}

nav a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0%;
  height: 2px;
  background: var(--gradient-primary);
  transition: width 0.3s ease;
}

nav a:hover::after {
  width: 100%;
}

/* Mobile Menu Toggle Button */
.mobile-menu-toggle {
  display: none;
  flex-direction: column;
  gap: 6px;
  background: transparent;
  border: none;
  cursor: pointer;
  z-index: 1001;
}

.mobile-menu-toggle span {
  width: 24px;
  height: 2px;
  background: var(--color-text);
  transition: all 0.3s ease;
}

.btn-github {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid var(--color-border);
  color: var(--color-text);
  padding: 8px 16px;
  border-radius: 8px;
  font-size: 13px;
  font-weight: 600;
  transition: background 0.2s, border-color 0.2s;
}

.btn-github:hover {
  background: rgba(255, 255, 255, 0.15);
  border-color: var(--color-border-active);
}

/* Sections Base */
section {
  padding: 100px 40px;
  max-width: 1200px;
  margin: 0 auto;
  position: relative;
}

.section-title {
  font-size: 32px;
  text-align: center;
  margin-bottom: 16px;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.section-subtitle {
  text-align: center;
  color: var(--color-text-muted);
  max-width: 600px;
  margin: 0 auto 60px;
  font-size: 16px;
}

/* Hero Section */
.hero {
  padding-top: 160px;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  position: relative;
}

.hero-glow {
  position: absolute;
  top: 50px;
  width: 600px;
  height: 600px;
  background: var(--gradient-glow);
  z-index: -1;
  pointer-events: none;
}

.hero h1 {
  font-size: 48px;
  font-weight: 800;
  line-height: 1.15;
  margin-bottom: 24px;
  max-width: 850px;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero p {
  font-size: 18px;
  color: var(--color-text-muted);
  max-width: 650px;
  margin-bottom: 40px;
}

.hero-actions {
  display: flex;
  gap: 16px;
  margin-bottom: 60px;
  transition: all 0.3s ease;
}

.btn-primary {
  display: inline-block;
  background: var(--gradient-primary);
  color: #000;
  font-weight: 700;
  padding: 14px 28px;
  border-radius: 8px;
  font-size: 15px;
  border: none;
  cursor: pointer;
  box-shadow: 0 4px 20px rgba(0, 229, 212, 0.25);
  transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1), box-shadow 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 24px rgba(0, 229, 212, 0.4);
  color: #000;
}

.btn-secondary {
  display: inline-block;
  background: transparent;
  color: var(--color-text);
  border: 1px solid var(--color-border);
  font-weight: 600;
  padding: 14px 28px;
  border-radius: 8px;
  font-size: 15px;
  cursor: pointer;
  transition: background 0.2s, border-color 0.2s;
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.05);
  border-color: var(--color-border-active);
}

/* Quick Start Box */
.quickstart-box {
  width: 100%;
  max-width: 600px;
  text-align: left;
  margin: 0 auto;
  box-shadow: 0 20px 50px rgba(0, 229, 212, 0.08);
}

.code-header {
  background: rgba(11, 19, 38, 0.8);
  border-top-left-radius: 8px;
  border-top-right-radius: 8px;
  border: 1px solid var(--color-border);
  border-bottom: none;
  padding: 10px 16px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.code-dots {
  display: flex;
  gap: 6px;
}

.code-dots span {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}

.code-dots span:nth-child(1) { background: var(--color-red); }
.code-dots span:nth-child(2) { background: var(--color-yellow); }
.code-dots span:nth-child(3) { background: var(--color-green); }

.copy-btn {
  background: rgba(255, 255, 255, 0.1);
  border: none;
  color: var(--color-text);
  padding: 4px 10px;
  border-radius: 4px;
  font-size: 11px;
  font-weight: 600;
  cursor: pointer;
  transition: background-color 0.2s ease;
}

.copy-btn:hover {
  background: rgba(255, 255, 255, 0.2);
}

.copy-btn:focus-visible {
  outline: 2px solid var(--color-cyan);
  outline-offset: 2px;
}

.code-block {
  background: rgba(5, 11, 24, 0.95);
  border: 1px solid var(--color-border);
  border-bottom-left-radius: 8px;
  border-bottom-right-radius: 8px;
  padding: 20px;
  overflow-x: auto;
}

.code-block code {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--color-cyan);
  white-space: pre;
}

.code-comment {
  color: var(--color-text-soft);
}

.code-cmd {
  color: var(--color-text);
}

/* Showcase Section Styling */
.gallery-container {
  display: flex;
  flex-direction: column;
  gap: 24px;
  padding: 30px;
  margin-top: 20px;
}

.gallery-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: center;
  border-bottom: 1px solid var(--color-border);
  padding-bottom: 20px;
}

.gallery-tab-btn {
  background: rgba(11, 19, 38, 0.4);
  border: 1px solid var(--color-border);
  color: var(--color-text-muted);
  padding: 10px 18px;
  border-radius: 8px;
  cursor: pointer;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 13px;
  transition: all 0.3s ease;
}

.gallery-tab-btn:hover {
  border-color: rgba(0, 229, 212, 0.3);
  color: var(--color-text);
}

.gallery-tab-btn.active {
  background: rgba(0, 229, 212, 0.12);
  border-color: var(--color-cyan);
  color: var(--color-cyan);
  box-shadow: 0 0 12px rgba(0, 229, 212, 0.1);
}

.gallery-window {
  background: #070e1c;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  box-shadow: 0 12px 30px rgba(0,0,0,0.5);
}

.browser-mock-header {
  background: rgba(11, 19, 38, 0.9);
  border-bottom: 1px solid var(--color-border);
  padding: 12px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.browser-dots {
  display: flex;
  gap: 6px;
}

.browser-dots span {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}

.browser-dots span:nth-child(1) { background: var(--color-red); }
.browser-dots span:nth-child(2) { background: var(--color-yellow); }
.browser-dots span:nth-child(3) { background: var(--color-green); }

.browser-address {
  background: rgba(5, 11, 24, 0.7);
  border: 1px solid var(--color-border);
  padding: 4px 20px;
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--color-text-soft);
  width: 60%;
  text-align: center;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.gallery-viewport {
  position: relative;
  width: 100%;
  max-height: 500px;
  overflow: hidden;
  background: #000;
}

.gallery-viewport img {
  width: 100%;
  height: auto;
  display: block;
  transition: opacity 0.15s ease;
  opacity: 1;
}

.gallery-viewport img.fade-out {
  opacity: 0;
}

.gallery-caption {
  padding: 16px 20px;
  border-top: 1px solid var(--color-border);
  background: rgba(11, 19, 38, 0.2);
  border-radius: 0 0 12px 12px;
}

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

/* Expanded Documentation Section */
.docs-wrapper {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 30px;
  margin-top: 40px;
}

.docs-sidebar {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 20px;
  height: fit-content;
}

.docs-side-btn {
  background: transparent;
  border: 1px solid transparent;
  padding: 14px 16px;
  border-radius: 8px;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 16px;
  text-align: left;
  width: 100%;
  transition: all 0.3s ease;
}

.docs-icon {
  font-size: 20px;
}

.docs-side-text h4 {
  font-size: 14px;
  color: var(--color-text);
  margin-bottom: 2px;
}

.docs-side-text span {
  font-size: 11px;
  color: var(--color-text-soft);
}

.docs-side-btn:hover {
  background: rgba(255, 255, 255, 0.03);
  border-color: var(--color-border);
}

.docs-side-btn.active {
  background: rgba(32, 214, 255, 0.08);
  border-color: rgba(32, 214, 255, 0.3);
}

.docs-side-btn.active h4 {
  color: var(--color-cyan);
}

.docs-content {
  padding: 40px;
  min-height: 400px;
}

.docs-pane {
  display: none;
  animation: fadeIn 0.4s ease forwards;
}

.docs-pane.active {
  display: block;
}

.docs-pane h3 {
  font-size: 24px;
  margin-bottom: 12px;
  background: linear-gradient(90deg, #fff, var(--color-text-muted));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.docs-pane p {
  font-size: 14px;
  color: var(--color-text-muted);
  margin-bottom: 30px;
  line-height: 1.6;
}

.docs-feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 20px;
  margin-bottom: 30px;
}

.docs-feat-card {
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 16px;
  transition: border-color 0.3s ease;
}

.docs-feat-card:hover {
  border-color: rgba(155, 92, 255, 0.4);
}

.docs-feat-card h5 {
  font-family: var(--font-display);
  font-size: 13px;
  font-weight: 700;
  margin-bottom: 6px;
  color: var(--color-violet);
}

.docs-feat-card p {
  font-size: 12px;
  color: var(--color-text-soft);
  margin-bottom: 0;
  line-height: 1.4;
}

.docs-code-header {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--color-text-soft);
  margin-bottom: 8px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.docs-code-block {
  background: rgba(5, 11, 24, 0.95);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 16px;
  overflow-x: auto;
}

.docs-code-block code {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--color-cyan);
  white-space: pre;
}

/* Problem & Solution Grid */
.problem-solution-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 30px;
}

.problems-box h3, .solutions-box h3 {
  font-size: 20px;
  margin-bottom: 24px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.problems-box h3 { color: var(--color-red); }
.solutions-box h3 { color: var(--color-green); }

.item-list {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.grid-item-card {
  padding: 20px;
}

.grid-item-card h4 {
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 6px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.grid-item-card p {
  font-size: 13px;
  color: var(--color-text-muted);
}

/* Operating Modes Interactive Tabs */
.modes-switcher {
  display: flex;
  justify-content: center;
  gap: 16px;
  margin-bottom: 40px;
}

.mode-tab-btn {
  background: rgba(11, 19, 38, 0.4);
  border: 1px solid var(--color-border);
  color: var(--color-text-muted);
  padding: 12px 24px;
  border-radius: 8px;
  cursor: pointer;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 14px;
  transition: all 0.3s;
}

.mode-tab-btn:hover {
  border-color: rgba(32, 214, 255, 0.4);
  color: var(--color-text);
}

.mode-tab-btn.active {
  background: rgba(32, 214, 255, 0.15);
  border-color: var(--color-border-active);
  color: var(--color-cyan);
  box-shadow: 0 0 15px rgba(32, 214, 255, 0.15);
}

.mode-panel {
  display: none;
  animation: fadeIn 0.4s ease forwards;
}

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

.mode-info-left h3 {
  font-size: 24px;
  margin-bottom: 12px;
  color: var(--color-text);
}

.mode-info-left p {
  color: var(--color-text-muted);
  font-size: 14px;
  margin-bottom: 24px;
  line-height: 1.6;
}

.mode-bullet-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.mode-bullet {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 13px;
  color: var(--color-text);
}

.bullet-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-cyan);
  margin-top: 8px;
  flex-shrink: 0;
}

.mode-graphics-right {
  min-height: 250px;
  padding: 24px;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

/* Architecture Stack Grid */
.arch-stack {
  display: flex;
  flex-direction: column;
  gap: 16px;
  max-width: 800px;
  margin: 0 auto;
}

.arch-layer {
  display: grid;
  grid-template-columns: 80px 180px 1fr;
  align-items: center;
  padding: 20px;
}

.layer-num {
  font-family: var(--font-mono);
  font-size: 18px;
  font-weight: 700;
  color: var(--color-text-soft);
}

.layer-name {
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 700;
  color: var(--color-cyan);
}

.layer-desc {
  font-size: 13px;
  color: var(--color-text-muted);
  line-height: 1.4;
}

/* Trust Layer / Lobby Split */
.lobby-split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 30px;
}

.lobby-card {
  padding: 30px;
}

.lobby-card h3 {
  font-size: 20px;
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.lobby-card.public h3 { color: var(--color-cyan); }
.lobby-card.private h3 { color: var(--color-violet); }

.lobby-card p {
  font-size: 13px;
  color: var(--color-text-muted);
  margin-bottom: 24px;
}

.lobby-agents-mock {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.agent-row-mock {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--color-border);
  padding: 10px 16px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 12px;
}

.agent-badge-mock {
  font-size: 9px;
  font-weight: 700;
  padding: 2px 6px;
  border-radius: 4px;
}

/* Concordium Brand badge */
.concordium-brand-badge {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: rgba(32, 214, 255, 0.08);
  border: 1px solid rgba(32, 214, 255, 0.3);
  padding: 8px 16px;
  border-radius: 20px;
  color: var(--color-cyan);
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 13px;
  transition: all 0.3s ease;
  margin-bottom: 20px;
  width: fit-content;
}

.concordium-brand-badge:hover {
  background: rgba(32, 214, 255, 0.15);
  border-color: var(--color-border-active);
  box-shadow: 0 0 15px rgba(32, 214, 255, 0.25);
  transform: scale(1.02);
  color: var(--color-text);
}

/* Competitive Grid table */
.comp-table-container {
  overflow-x: auto;
}

.comp-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 13px;
  border-radius: 8px;
  overflow: hidden;
}

.comp-table th, .comp-table td {
  padding: 14px 16px;
  border-bottom: 1px solid var(--color-border);
}

.comp-table th {
  font-family: var(--font-display);
  font-weight: 700;
  color: var(--color-text);
  background: rgba(255, 255, 255, 0.02);
}

.comp-table tr {
  transition: background-color 0.2s ease;
}

.comp-table tr:hover td {
  background: rgba(255, 255, 255, 0.02);
}

.comp-table td.highlight-column {
  background: rgba(32, 214, 255, 0.04);
  font-weight: 600;
  color: var(--color-text);
  border-left: 1px solid rgba(0, 229, 212, 0.15);
  border-right: 1px solid rgba(0, 229, 212, 0.15);
}

.table-icon-check { color: var(--color-green); font-weight: bold; }
.table-icon-cross { color: var(--color-red); font-weight: bold; }
.table-icon-warn { color: var(--color-yellow); font-weight: bold; }

/* Footer */
footer {
  border-top: 1px solid var(--color-border);
  padding: 40px;
  text-align: center;
  font-size: 12px;
  color: var(--color-text-soft);
  display: flex;
  flex-direction: column;
  gap: 16px;
  background: rgba(5, 11, 24, 0.9);
}

footer p {
  max-width: 600px;
  margin: 0 auto;
}

/* Keyframes */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

@media(max-width: 900px) {
  .problem-solution-grid, .lobby-split, .docs-wrapper {
    grid-template-columns: 1fr;
  }
  .mode-panel.active {
    grid-template-columns: 1fr;
  }
  header {
    padding: 0 20px;
  }
  .mobile-menu-toggle {
    display: flex;
  }
  nav.nav-links {
    position: fixed;
    top: 70px;
    left: 0;
    right: 0;
    background: rgba(5, 11, 24, 0.98);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--color-border);
    flex-direction: column;
    padding: 30px;
    gap: 20px;
    transform: translateY(-150%);
    transition: transform 0.4s ease;
    pointer-events: none;
    z-index: 999;
  }
  nav.nav-links.mobile-active {
    transform: translateY(0);
    pointer-events: auto;
  }
  .mobile-menu-toggle.active span:nth-child(1) {
    transform: translateY(8px) rotate(45deg);
  }
  .mobile-menu-toggle.active span:nth-child(2) {
    opacity: 0;
  }
  .mobile-menu-toggle.active span:nth-child(3) {
    transform: translateY(-8px) rotate(-45deg);
  }
}