/* ==========================================================================
   Nexaeos Modern Design System - Digital Public Commons
   Theme: Deep Tech-Slate & Emerald Public Goods Aesthetic
   ========================================================================== */

:root {
  --bg-primary: #0a0f1d;
  --bg-secondary: #111827;
  --bg-tertiary: #1e293b;
  --bg-card: rgba(17, 24, 39, 0.75);
  --bg-card-hover: rgba(30, 41, 59, 0.85);
  
  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-accent: rgba(16, 185, 129, 0.3);
  --border-focus: #10b981;
  
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  
  --accent-emerald: #10b981;
  --accent-emerald-glow: rgba(16, 185, 129, 0.25);
  --accent-cyan: #06b6d4;
  --accent-cyan-glow: rgba(6, 182, 212, 0.2);
  --accent-amber: #f59e0b;
  --accent-rose: #f43f5e;
  --accent-indigo: #6366f1;

  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Inter", "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;

  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.3), 0 2px 4px -1px rgba(0, 0, 0, 0.2);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.4), 0 4px 6px -2px rgba(0, 0, 0, 0.25);
  --shadow-glow: 0 0 25px rgba(16, 185, 129, 0.15);
  
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --radius-full: 9999px;
  
  --transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  background-color: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-sans);
  line-height: 1.65;
  min-height: 100vh;
  overflow-x: hidden;
  position: relative;
}

/* Background Atmosphere */
body::before {
  content: "";
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: 
    radial-gradient(circle at 15% 20%, rgba(16, 185, 129, 0.08) 0%, transparent 40%),
    radial-gradient(circle at 85% 75%, rgba(6, 182, 212, 0.07) 0%, transparent 45%),
    radial-gradient(circle at 50% 50%, rgba(99, 102, 241, 0.04) 0%, transparent 60%);
  pointer-events: none;
  z-index: -1;
}

/* Container */
.container {
  width: 100%;
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* Navigation Bar */
.navbar-modern {
  position: sticky;
  top: 0;
  width: 100%;
  background: rgba(10, 15, 29, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-subtle);
  z-index: 1000;
  transition: var(--transition);
}

.nav-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 4.25rem;
}

.brand-wrapper {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: var(--text-primary);
}

.brand-symbol {
  width: 2.25rem;
  height: 2.25rem;
  border-radius: var(--radius-sm);
  background: linear-gradient(135deg, var(--accent-emerald), var(--accent-cyan));
  display: flex;
  align-items: center;
  justify-content: center;
  color: #000;
  font-weight: 800;
  font-size: 1.15rem;
  box-shadow: 0 0 15px var(--accent-emerald-glow);
}

.brand-title {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.025em;
  background: linear-gradient(90deg, #ffffff, #cbd5e1);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.brand-tag {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent-emerald);
  background: rgba(16, 185, 129, 0.1);
  padding: 0.2rem 0.5rem;
  border-radius: var(--radius-full);
  border: 1px solid rgba(16, 185, 129, 0.25);
  font-weight: 600;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.75rem;
  list-style: none;
}

.nav-link {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.925rem;
  font-weight: 500;
  transition: var(--transition);
  position: relative;
  padding: 0.25rem 0;
}

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

.nav-link.active::after {
  content: "";
  position: absolute;
  bottom: -4px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--accent-emerald);
  border-radius: var(--radius-full);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.btn-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 1.15rem;
  border-radius: var(--radius-full);
  font-size: 0.875rem;
  font-weight: 600;
  text-decoration: none;
  transition: var(--transition);
  cursor: pointer;
  border: 1px solid transparent;
}

.btn-primary {
  background: var(--accent-emerald);
  color: #042f2e;
  box-shadow: 0 2px 10px var(--accent-emerald-glow);
}

.btn-primary:hover {
  background: #34d399;
  box-shadow: 0 4px 20px rgba(16, 185, 129, 0.4);
  transform: translateY(-1px);
}

.btn-secondary {
  background: var(--bg-tertiary);
  color: var(--text-primary);
  border: 1px solid var(--border-subtle);
}

.btn-secondary:hover {
  background: #334155;
  border-color: rgba(255, 255, 255, 0.15);
  transform: translateY(-1px);
}

.node-status-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  font-size: 0.775rem;
  font-weight: 500;
  color: var(--accent-emerald);
  background: rgba(16, 185, 129, 0.1);
  border: 1px solid rgba(16, 185, 129, 0.25);
  padding: 0.25rem 0.65rem;
  border-radius: var(--radius-full);
}

.pulse-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--accent-emerald);
  box-shadow: 0 0 8px var(--accent-emerald);
  animation: pulse-ring 2s infinite ease-out;
}

@keyframes pulse-ring {
  0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7); }
  70% { transform: scale(1.1); box-shadow: 0 0 0 6px rgba(16, 185, 129, 0); }
  100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0); }
}

/* Mobile Nav Toggle */
.mobile-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text-primary);
  font-size: 1.5rem;
  cursor: pointer;
}

/* Hero Section */
.hero-section {
  padding: 5.5rem 0 4rem;
  position: relative;
  text-align: center;
}

.hero-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.35rem 0.95rem;
  background: rgba(16, 185, 129, 0.1);
  border: 1px solid rgba(16, 185, 129, 0.3);
  border-radius: var(--radius-full);
  font-size: 0.825rem;
  font-weight: 600;
  color: var(--accent-emerald);
  margin-bottom: 1.5rem;
}

.hero-title {
  font-size: clamp(2.25rem, 5vw, 3.75rem);
  font-weight: 800;
  letter-spacing: -0.035em;
  line-height: 1.15;
  margin-bottom: 1.5rem;
  max-width: 900px;
  margin-left: auto;
  margin-right: auto;
}

.gradient-text {
  background: linear-gradient(135deg, #ffffff 30%, #a7f3d0 70%, #38bdf8 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: clamp(1.05rem, 2vw, 1.25rem);
  color: var(--text-secondary);
  max-width: 720px;
  margin: 0 auto 2.5rem;
  font-weight: 400;
  line-height: 1.7;
}

.hero-cta-group {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1.25rem;
  flex-wrap: wrap;
  margin-bottom: 3.5rem;
}

/* Stats / Impact Bar */
.stats-banner {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.5rem;
  background: var(--bg-card);
  backdrop-filter: blur(8px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 1.75rem 2rem;
  box-shadow: var(--shadow-lg);
  margin-bottom: 5rem;
}

.stat-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  position: relative;
}

.stat-item:not(:last-child)::after {
  content: "";
  position: absolute;
  right: -0.75rem;
  top: 15%;
  height: 70%;
  width: 1px;
  background: var(--border-subtle);
}

.stat-value {
  font-size: 2rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  line-height: 1.2;
}

.stat-value.highlight {
  color: var(--accent-emerald);
}

.stat-label {
  font-size: 0.85rem;
  color: var(--text-secondary);
  font-weight: 500;
  margin-top: 0.25rem;
}

/* Section Common Styling */
.section-header {
  text-align: center;
  max-width: 740px;
  margin: 0 auto 3.5rem;
}

.section-tag {
  font-size: 0.775rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent-emerald);
  margin-bottom: 0.75rem;
  display: block;
}

.section-title {
  font-size: clamp(1.75rem, 3.5vw, 2.5rem);
  font-weight: 800;
  letter-spacing: -0.025em;
  line-height: 1.25;
  margin-bottom: 1rem;
}

.section-description {
  font-size: 1.05rem;
  color: var(--text-secondary);
  line-height: 1.65;
}

/* Feature Grid Cards */
.card-grid-3 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 1.75rem;
  margin-bottom: 4rem;
}

.card-grid-4 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.5rem;
  margin-bottom: 4rem;
}

.glass-card {
  background: var(--bg-card);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 2rem;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.glass-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--border-subtle), transparent);
  transition: var(--transition);
}

.glass-card:hover {
  transform: translateY(-3px);
  background: var(--bg-card-hover);
  border-color: rgba(16, 185, 129, 0.3);
  box-shadow: var(--shadow-lg), var(--shadow-glow);
}

.glass-card:hover::before {
  background: linear-gradient(90deg, transparent, var(--accent-emerald), transparent);
}

.card-icon-wrapper {
  width: 3.25rem;
  height: 3.25rem;
  border-radius: var(--radius-sm);
  background: rgba(16, 185, 129, 0.1);
  border: 1px solid rgba(16, 185, 129, 0.2);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  color: var(--accent-emerald);
  margin-bottom: 1.25rem;
}

.card-icon-wrapper.cyan {
  background: rgba(6, 182, 212, 0.1);
  border-color: rgba(6, 182, 212, 0.2);
  color: var(--accent-cyan);
}

.card-icon-wrapper.amber {
  background: rgba(245, 158, 11, 0.1);
  border-color: rgba(245, 158, 11, 0.2);
  color: var(--accent-amber);
}

.card-icon-wrapper.indigo {
  background: rgba(99, 102, 241, 0.1);
  border-color: rgba(99, 102, 241, 0.2);
  color: var(--accent-indigo);
}

.card-title {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.015em;
  margin-bottom: 0.75rem;
}

.card-text {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.6;
}

.card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-top: 1.25rem;
}

.tag-badge {
  font-size: 0.75rem;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-subtle);
  padding: 0.2rem 0.5rem;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
}

/* Architecture Blueprint Section */
.blueprint-card {
  background: linear-gradient(180deg, rgba(17, 24, 39, 0.95) 0%, rgba(15, 23, 42, 0.85) 100%);
  border: 1px solid var(--border-accent);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
  margin-bottom: 4rem;
  box-shadow: var(--shadow-lg);
}

.layer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.75rem;
  margin-top: 2rem;
}

.layer-box {
  background: rgba(30, 41, 59, 0.5);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.5rem;
}

.layer-box-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--border-subtle);
}

.layer-box-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
}

.layer-badge {
  font-size: 0.75rem;
  font-family: var(--font-mono);
  background: rgba(16, 185, 129, 0.15);
  color: var(--accent-emerald);
  padding: 0.15rem 0.5rem;
  border-radius: var(--radius-sm);
}

.layer-list {
  list-style: none;
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.layer-list li {
  padding: 0.4rem 0;
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
}

.layer-list li::before {
  content: "▹";
  color: var(--accent-emerald);
  font-size: 0.9rem;
}

/* Incentive Architecture & Elinor Ostrom Commons */
.commons-rule-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(270px, 1fr));
  gap: 1.25rem;
  margin-top: 2rem;
}

.rule-box {
  background: rgba(17, 24, 39, 0.6);
  border-left: 3px solid var(--accent-emerald);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  padding: 1.25rem 1.5rem;
  border-top: 1px solid var(--border-subtle);
  border-right: 1px solid var(--border-subtle);
  border-bottom: 1px solid var(--border-subtle);
}

.rule-number {
  font-size: 0.75rem;
  font-family: var(--font-mono);
  color: var(--accent-emerald);
  font-weight: 700;
  text-transform: uppercase;
  margin-bottom: 0.35rem;
}

.rule-title {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.rule-desc {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.55;
}

/* x402 Micropayment Panel */
.micropayment-box {
  background: linear-gradient(135deg, rgba(16, 185, 129, 0.08) 0%, rgba(6, 182, 212, 0.05) 100%);
  border: 1px solid rgba(16, 185, 129, 0.25);
  border-radius: var(--radius-lg);
  padding: 2.25rem;
  margin: 3.5rem 0;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.x402-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  background: rgba(16, 185, 129, 0.15);
  color: var(--accent-emerald);
  border: 1px solid rgba(16, 185, 129, 0.3);
  padding: 0.3rem 0.75rem;
  border-radius: var(--radius-full);
  font-size: 0.8rem;
  font-weight: 700;
  font-family: var(--font-mono);
  width: fit-content;
}

/* Footer */
.footer-modern {
  border-top: 1px solid var(--border-subtle);
  background: var(--bg-secondary);
  padding: 4.5rem 0 2.5rem;
  margin-top: 6rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr repeat(3, 1fr);
  gap: 3rem;
  margin-bottom: 3.5rem;
}

.footer-brand p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  margin-top: 1rem;
  max-width: 320px;
  line-height: 1.6;
}

.footer-column h4 {
  font-size: 0.9rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-primary);
  margin-bottom: 1.25rem;
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.footer-links a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.9rem;
  transition: var(--transition);
}

.footer-links a:hover {
  color: var(--accent-emerald);
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-top: 1px solid var(--border-subtle);
  padding-top: 2rem;
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* Responsive Breakpoints */
@media (max-width: 900px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
  }
  .stat-item:not(:last-child)::after {
    display: none;
  }
}

@media (max-width: 768px) {
  .nav-links, .nav-actions {
    display: none;
  }
  .mobile-toggle {
    display: block;
  }
  .footer-grid {
    grid-template-columns: 1fr;
  }
  .footer-bottom {
    flex-direction: column;
    gap: 1rem;
    text-align: center;
  }
}