:root {
  --bg-primary: #0a0d14;
  --bg-secondary: #101623;
  --bg-card: rgba(18, 24, 38, 0.7);
  --border-card: rgba(255, 255, 255, 0.08);
  --border-glow: rgba(99, 102, 241, 0.4);
  --accent-cyan: #06b6d4;
  --accent-indigo: #6366f1;
  --accent-purple: #a855f7;
  --accent-emerald: #10b981;
  --accent-amber: #f59e0b;
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-dim: #64748b;
  --radius-lg: 16px;
  --radius-md: 12px;
  --radius-sm: 8px;
  --font-family: 'Outfit', 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
}

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

body {
  background-color: var(--bg-primary);
  color: var(--text-main);
  font-family: var(--font-family);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
  background-image: 
    radial-gradient(circle at 15% 20%, rgba(99, 102, 241, 0.12) 0%, transparent 40%),
    radial-gradient(circle at 85% 80%, rgba(168, 85, 247, 0.12) 0%, transparent 40%),
    radial-gradient(circle at 50% 50%, rgba(6, 182, 212, 0.05) 0%, transparent 60%);
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem 1.5rem;
  width: 100%;
}

/* Header */
header {
  border-bottom: 1px solid var(--border-card);
  backdrop-filter: blur(12px);
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(10, 13, 20, 0.8);
}

.navbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 1.5rem;
  max-width: 1200px;
  margin: 0 auto;
}

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

.brand-icon {
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, var(--accent-cyan), var(--accent-indigo));
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  box-shadow: 0 0 20px rgba(99, 102, 241, 0.35);
}

.brand-title {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  background: linear-gradient(to right, #ffffff, #cbd5e1);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.badge-sandbox {
  font-size: 0.75rem;
  background: rgba(16, 185, 129, 0.15);
  color: var(--accent-emerald);
  border: 1px solid rgba(16, 185, 129, 0.3);
  padding: 4px 10px;
  border-radius: 999px;
  display: flex;
  align-items: center;
  gap: 6px;
  font-weight: 500;
}

.pulse-dot {
  width: 7px;
  height: 7px;
  background: var(--accent-emerald);
  border-radius: 50%;
  animation: pulse 2s infinite;
}

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

/* Hero Section */
.hero {
  text-align: center;
  margin: 2.5rem 0 3rem 0;
}

.hero-tag {
  display: inline-block;
  font-size: 0.85rem;
  color: var(--accent-cyan);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-weight: 600;
  margin-bottom: 0.75rem;
}

.hero h1 {
  font-size: 2.75rem;
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 1rem;
  background: linear-gradient(135deg, #ffffff 30%, #94a3b8 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero p {
  color: var(--text-muted);
  font-size: 1.1rem;
  max-width: 680px;
  margin: 0 auto;
  line-height: 1.6;
}

/* Metrics Cards Grid */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 1.5rem;
  margin-bottom: 3rem;
}

.stat-card {
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  position: relative;
  overflow: hidden;
  transition: transform 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}

.stat-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-glow);
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.4);
}

.stat-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--accent-cyan), var(--accent-indigo));
  opacity: 0.8;
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.25rem;
}

.card-title-group {
  display: flex;
  align-items: center;
  gap: 10px;
}

.card-icon {
  font-size: 1.5rem;
}

.card-title {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-main);
}

.status-badge {
  font-size: 0.7rem;
  padding: 3px 8px;
  border-radius: 6px;
  font-weight: 600;
  text-transform: uppercase;
}

.badge-active {
  background: rgba(16, 185, 129, 0.15);
  color: var(--accent-emerald);
}

.badge-isolated {
  background: rgba(99, 102, 241, 0.15);
  color: var(--accent-indigo);
}

.card-value {
  font-size: 1.4rem;
  font-weight: 700;
  font-family: monospace;
  color: var(--accent-cyan);
  word-break: break-all;
  margin-bottom: 0.5rem;
}

.card-desc {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.5;
}

.card-meta {
  margin-top: 1rem;
  padding-top: 0.75rem;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  display: flex;
  justify-content: space-between;
  font-size: 0.8rem;
  color: var(--text-dim);
}

/* Tabs and Interactive Demo Section */
.demo-section {
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-lg);
  padding: 2rem;
  margin-bottom: 3rem;
}

.section-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
  gap: 1rem;
}

.section-title {
  font-size: 1.4rem;
  font-weight: 700;
}

.tabs-nav {
  display: flex;
  gap: 8px;
  background: rgba(0, 0, 0, 0.3);
  padding: 4px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-card);
}

.tab-btn {
  background: transparent;
  border: none;
  color: var(--text-muted);
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s ease;
  font-family: inherit;
}

.tab-btn.active {
  background: var(--accent-indigo);
  color: #ffffff;
  box-shadow: 0 2px 8px rgba(99, 102, 241, 0.4);
}

.tab-content {
  display: none;
}

.tab-content.active {
  display: block;
}

/* Interactive D1 Form & Table */
.d1-box {
  display: grid;
  grid-template-columns: 1fr 1.5fr;
  gap: 2rem;
}

@media (max-width: 768px) {
  .d1-box {
    grid-template-columns: 1fr;
  }
}

.form-group {
  margin-bottom: 1.25rem;
}

.form-group label {
  display: block;
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
  font-weight: 500;
}

.form-input {
  width: 100%;
  padding: 10px 14px;
  background: rgba(0, 0, 0, 0.25);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-sm);
  color: #ffffff;
  font-family: inherit;
  font-size: 0.95rem;
  transition: border-color 0.2s ease;
}

.form-input:focus {
  outline: none;
  border-color: var(--accent-cyan);
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent-indigo), var(--accent-purple));
  color: white;
  border: none;
  padding: 12px 20px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  cursor: pointer;
  font-size: 0.95rem;
  transition: opacity 0.2s ease, transform 0.1s ease;
  width: 100%;
}

.btn-primary:hover {
  opacity: 0.95;
  transform: translateY(-1px);
}

.data-table-container {
  overflow-x: auto;
  background: rgba(0, 0, 0, 0.2);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-card);
  padding: 1rem;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}

th, td {
  padding: 10px 14px;
  text-align: left;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

th {
  color: var(--text-muted);
  font-weight: 600;
}

td {
  color: var(--text-main);
}

/* Upload Box for R2 */
.upload-dropzone {
  border: 2px dashed rgba(99, 102, 241, 0.3);
  border-radius: var(--radius-md);
  padding: 3rem 2rem;
  text-align: center;
  background: rgba(0, 0, 0, 0.15);
  cursor: pointer;
  transition: border-color 0.3s ease, background-color 0.3s ease;
}

.upload-dropzone:hover {
  border-color: var(--accent-cyan);
  background: rgba(6, 182, 212, 0.04);
}

.upload-icon {
  font-size: 3rem;
  margin-bottom: 1rem;
  color: var(--accent-indigo);
}

/* Architecture Map */
.arch-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.5rem;
}

.arch-node {
  background: rgba(0, 0, 0, 0.2);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  position: relative;
}

.arch-node.active-scope {
  border-color: var(--accent-emerald);
  box-shadow: 0 0 15px rgba(16, 185, 129, 0.15);
}

.arch-node.protected-scope {
  border-color: rgba(239, 68, 68, 0.3);
  opacity: 0.75;
}

/* Footer */
footer {
  margin-top: auto;
  border-top: 1px solid var(--border-card);
  padding: 2rem 1.5rem;
  text-align: center;
  color: var(--text-dim);
  font-size: 0.85rem;
}