@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&family=JetBrains+Mono:wght@400;500&display=swap');

:root {
  --bg-primary: #0a0e1a;
  --bg-secondary: #111827;
  --bg-card: rgba(17, 24, 39, 0.8);
  --bg-glass: rgba(255,255,255,0.03);
  --border: rgba(255,255,255,0.08);
  --border-glow: rgba(99,102,241,0.3);
  --text-primary: #f1f5f9;
  --text-secondary: #94a3b8;
  --text-dim: #64748b;
  --accent-blue: #6366f1;
  --accent-cyan: #22d3ee;
  --accent-green: #10b981;
  --accent-amber: #f59e0b;
  --accent-rose: #f43f5e;
  --accent-purple: #a855f7;
  --accent-orange: #f97316;
  --glow-blue: 0 0 20px rgba(99,102,241,0.3);
  --glow-cyan: 0 0 20px rgba(34,211,238,0.3);
  --glow-green: 0 0 20px rgba(16,185,129,0.3);
}

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

body {
  font-family: 'Inter', -apple-system, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  overflow-x: hidden;
  min-height: 100vh;
}

/* Background grid */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background:
    linear-gradient(rgba(99,102,241,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(99,102,241,0.03) 1px, transparent 1px);
  background-size: 60px 60px;
  pointer-events: none;
  z-index: 0;
}

/* ─── HEADER ─── */
.header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(10,14,26,0.85);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  padding: 12px 32px;
  display: flex; align-items: center; justify-content: space-between;
}
.header-logo { display: flex; align-items: center; gap: 12px; }
.header-logo .icon { width:36px; height:36px; border-radius:10px;
  background: linear-gradient(135deg, var(--accent-blue), var(--accent-cyan));
  display:flex; align-items:center; justify-content:center; font-size:18px; }
.header-logo h1 { font-size: 18px; font-weight: 700;
  background: linear-gradient(135deg, #fff, var(--accent-cyan));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
.header-logo span { font-size: 12px; color: var(--text-dim);
  background: var(--bg-glass); padding: 2px 10px; border-radius: 20px;
  border: 1px solid var(--border); margin-left: 8px; }

/* ─── TABS ─── */
.tab-nav {
  display: flex; gap: 4px;
  background: var(--bg-glass); border-radius: 12px;
  padding: 4px; border: 1px solid var(--border);
}
.tab-btn {
  padding: 8px 20px; border-radius: 8px; border: none;
  background: transparent; color: var(--text-secondary);
  font-family: 'Inter'; font-size: 13px; font-weight: 500;
  cursor: pointer; transition: all 0.3s;
}
.tab-btn:hover { color: var(--text-primary); background: rgba(255,255,255,0.05); }
.tab-btn.active {
  background: var(--accent-blue); color: #fff;
  box-shadow: var(--glow-blue);
}

/* ─── CANVAS AREA ─── */
.canvas-wrap {
  position: relative; z-index: 1;
  max-width: 1600px; margin: 0 auto; padding: 32px;
}
.view { display: none; }
.view.active { display: block; animation: fadeUp 0.4s ease; }
@keyframes fadeUp { from { opacity:0; transform:translateY(16px); } to { opacity:1; transform:translateY(0); } }

/* ─── ARCHITECTURE VIEW ─── */
.arch-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}
.arch-layer {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 24px;
  backdrop-filter: blur(10px);
  transition: all 0.3s;
  cursor: pointer;
  position: relative;
  overflow: hidden;
}
.arch-layer::before {
  content: '';
  position: absolute; top: 0; left: 0; right: 0; height: 3px;
  border-radius: 16px 16px 0 0;
  opacity: 0.8;
}
.arch-layer:hover {
  border-color: var(--border-glow);
  transform: translateY(-2px);
  box-shadow: 0 8px 32px rgba(0,0,0,0.3);
}
.arch-layer.expanded { background: rgba(17,24,39,0.95); }

.layer-header {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: 12px;
}
.layer-badge {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 4px 12px; border-radius: 20px; font-size: 11px;
  font-weight: 600; text-transform: uppercase; letter-spacing: 0.5px;
}
.layer-title { font-size: 18px; font-weight: 700; }
.layer-desc { font-size: 13px; color: var(--text-secondary); line-height: 1.6; }
.layer-tech {
  display: flex; flex-wrap: wrap; gap: 6px; margin-top: 12px;
}
.tech-tag {
  padding: 3px 10px; border-radius: 6px; font-size: 11px;
  font-family: 'JetBrains Mono'; font-weight: 500;
  background: var(--bg-glass); border: 1px solid var(--border);
  color: var(--text-secondary);
}
.layer-expand-icon {
  font-size: 16px; color: var(--text-dim);
  transition: transform 0.3s;
}
.arch-layer.expanded .layer-expand-icon { transform: rotate(180deg); }

/* Layer colors */
.layer-ingestion::before { background: linear-gradient(90deg, var(--accent-blue), var(--accent-cyan)); }
.layer-ingestion .layer-badge { background: rgba(99,102,241,0.15); color: var(--accent-blue); }
.layer-kafka::before { background: linear-gradient(90deg, var(--accent-purple), var(--accent-rose)); }
.layer-kafka .layer-badge { background: rgba(168,85,247,0.15); color: var(--accent-purple); }
.layer-processing::before { background: linear-gradient(90deg, var(--accent-amber), var(--accent-orange)); }
.layer-processing .layer-badge { background: rgba(245,158,11,0.15); color: var(--accent-amber); }
.layer-storage::before { background: linear-gradient(90deg, var(--accent-green), var(--accent-cyan)); }
.layer-storage .layer-badge { background: rgba(16,185,129,0.15); color: var(--accent-green); }
.layer-delivery::before { background: linear-gradient(90deg, var(--accent-cyan), var(--accent-blue)); }
.layer-delivery .layer-badge { background: rgba(34,211,238,0.15); color: var(--accent-cyan); }
.layer-clients::before { background: linear-gradient(90deg, var(--accent-rose), var(--accent-purple)); }
.layer-clients .layer-badge { background: rgba(244,63,94,0.15); color: var(--accent-rose); }

/* Expanded detail */
.layer-detail {
  display: none; margin-top: 16px; padding-top: 16px;
  border-top: 1px solid var(--border);
}
.arch-layer.expanded .layer-detail { display: block; animation: fadeUp 0.3s ease; }

.detail-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 12px;
}
.detail-card {
  background: var(--bg-glass); border: 1px solid var(--border);
  border-radius: 10px; padding: 14px;
}
.detail-card h4 { font-size: 13px; font-weight: 600; margin-bottom: 6px; display: flex; align-items: center; gap: 6px; }
.detail-card p { font-size: 12px; color: var(--text-secondary); line-height: 1.5; }
.detail-card .metric { font-family: 'JetBrains Mono'; font-size: 18px; font-weight: 700; margin: 4px 0; }

/* ─── FLOW ARROWS between layers ─── */
.flow-connector {
  display: flex; align-items: center; justify-content: center;
  padding: 4px 0; color: var(--text-dim); font-size: 20px;
  position: relative;
}
.flow-connector .flow-label {
  position: absolute; font-size: 10px; font-family: 'JetBrains Mono';
  background: var(--bg-primary); padding: 2px 8px; border-radius: 4px;
  border: 1px solid var(--border); color: var(--text-secondary);
}

/* ─── DATA FLOW VIEW ─── */
.flow-section {
  margin-bottom: 40px;
}
.flow-title {
  font-size: 22px; font-weight: 700; margin-bottom: 6px;
  display: flex; align-items: center; gap: 10px;
}
.flow-subtitle { font-size: 13px; color: var(--text-secondary); margin-bottom: 20px; }
.flow-path {
  display: flex; align-items: stretch; gap: 0;
  overflow-x: auto; padding: 16px 0;
}
.flow-node {
  min-width: 160px; max-width: 200px; flex-shrink: 0;
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: 12px; padding: 14px; text-align: center;
  position: relative; transition: all 0.3s;
}
.flow-node:hover { border-color: var(--border-glow); transform: translateY(-3px); box-shadow: 0 6px 24px rgba(0,0,0,0.3); }
.flow-node .node-icon { font-size: 24px; margin-bottom: 6px; }
.flow-node .node-name { font-size: 13px; font-weight: 600; margin-bottom: 4px; }
.flow-node .node-detail { font-size: 11px; color: var(--text-secondary); }
.flow-node .node-tech { font-size: 10px; font-family: 'JetBrains Mono'; color: var(--text-dim); margin-top: 6px; }
.flow-arrow {
  display: flex; align-items: center; justify-content: center;
  min-width: 60px; color: var(--text-dim); font-size: 14px;
  flex-direction: column; gap: 2px;
}
.flow-arrow .arrow-label { font-size: 9px; font-family: 'JetBrains Mono'; color: var(--text-dim); text-align: center; max-width: 70px; }

/* Animated pulse on flow nodes */
.flow-node.pulse { animation: nodePulse 2s ease infinite; }
@keyframes nodePulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(99,102,241,0); }
  50% { box-shadow: 0 0 0 6px rgba(99,102,241,0.15); }
}

/* ─── LATENCY BADGE ─── */
.latency {
  display: inline-block; padding: 2px 8px; border-radius: 4px;
  font-size: 10px; font-family: 'JetBrains Mono'; font-weight: 600;
  margin-top: 6px;
}
.latency.fast { background: rgba(16,185,129,0.15); color: var(--accent-green); }
.latency.medium { background: rgba(245,158,11,0.15); color: var(--accent-amber); }

/* ─── STATS BAR ─── */
.stats-bar {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 12px; margin-bottom: 28px;
}
.stat-card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: 12px; padding: 16px; text-align: center;
}
.stat-card .stat-value {
  font-size: 26px; font-weight: 800;
  background: linear-gradient(135deg, var(--accent-blue), var(--accent-cyan));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
}
.stat-card .stat-label { font-size: 11px; color: var(--text-dim); margin-top: 4px; text-transform: uppercase; letter-spacing: 0.5px; }

/* ─── LEGEND ─── */
.legend {
  display: flex; flex-wrap: wrap; gap: 16px;
  padding: 12px 16px; border-radius: 10px;
  background: var(--bg-glass); border: 1px solid var(--border);
  margin-bottom: 24px;
}
.legend-item { display: flex; align-items: center; gap: 6px; font-size: 12px; color: var(--text-secondary); }
.legend-dot { width: 10px; height: 10px; border-radius: 50%; }

/* ─── ANIMATED FLOW ARROWS ─── */
.flow-arrow-animated {
  display: flex; align-items: center; justify-content: center;
  min-width: 70px; position: relative;
}
.flow-arrow-animated .arrow-line {
  width: 100%; height: 2px; position: relative;
  background: linear-gradient(90deg, transparent, var(--accent-blue), transparent);
  overflow: visible;
}
.flow-arrow-animated .arrow-particle {
  position: absolute; top: -3px; width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--accent-cyan);
  box-shadow: 0 0 12px var(--accent-cyan), 0 0 24px rgba(34,211,238,0.3);
  animation: particleMove 2s ease-in-out infinite;
}
.flow-arrow-animated .arrow-head {
  position: absolute; right: -4px; top: -4px;
  width: 0; height: 0;
  border-left: 6px solid var(--accent-blue);
  border-top: 5px solid transparent;
  border-bottom: 5px solid transparent;
}
@keyframes particleMove {
  0% { left: -8px; opacity: 0; }
  10% { opacity: 1; }
  90% { opacity: 1; }
  100% { left: calc(100% - 8px); opacity: 0; }
}
.flow-section:nth-child(2) .arrow-particle { animation-delay: 0.1s; background: var(--accent-green); box-shadow: 0 0 12px var(--accent-green); }
.flow-section:nth-child(3) .arrow-particle { animation-delay: 0.2s; background: var(--accent-amber); box-shadow: 0 0 12px var(--accent-amber); }
.flow-section:nth-child(4) .arrow-particle { animation-delay: 0.3s; background: var(--accent-purple); box-shadow: 0 0 12px var(--accent-purple); }

/* Sequential node highlighting */
.flow-node.highlight-active {
  border-color: var(--accent-cyan) !important;
  box-shadow: 0 0 20px rgba(34,211,238,0.25) !important;
}

/* ─── MONETIZATION VIEW ─── */
.tier-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px; margin-bottom: 32px;
}
.tier-card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: 16px; padding: 24px;
  position: relative; overflow: hidden;
  transition: all 0.3s; text-align: center;
}
.tier-card::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px;
  border-radius: 16px 16px 0 0;
}
.tier-card:hover { transform: translateY(-4px); box-shadow: 0 8px 32px rgba(0,0,0,0.4); }
.tier-card.popular { border-color: var(--accent-blue); }
.tier-card.popular::after {
  content: 'MOST POPULAR'; position: absolute; top: 12px; right: -28px;
  background: var(--accent-blue); color: #fff; font-size: 9px; font-weight: 700;
  padding: 2px 32px; transform: rotate(45deg); letter-spacing: 0.5px;
}
.tier-name { font-size: 18px; font-weight: 700; margin-bottom: 4px; }
.tier-price { font-size: 32px; font-weight: 800; margin: 8px 0;
  background: linear-gradient(135deg, var(--accent-blue), var(--accent-cyan));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
.tier-price small { font-size: 14px; font-weight: 400; }
.tier-credits { font-family: 'JetBrains Mono'; font-size: 13px; color: var(--accent-green); margin-bottom: 12px; }
.tier-features { list-style: none; text-align: left; }
.tier-features li {
  font-size: 12px; color: var(--text-secondary); padding: 4px 0;
  border-bottom: 1px solid rgba(255,255,255,0.03);
  display: flex; align-items: center; gap: 6px;
}
.tier-features li::before { content: '✓'; color: var(--accent-green); font-weight: 700; }
.tier-features li.no::before { content: '✗'; color: var(--accent-rose); }

/* Credit scoring pipeline */
.credit-pipeline {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: 16px; padding: 24px; margin-bottom: 24px;
}
.credit-pipeline h3 { font-size: 16px; font-weight: 700; margin-bottom: 16px; display: flex; align-items: center; gap: 8px; }
.credit-step {
  display: flex; align-items: center; gap: 12px;
  padding: 10px 16px; margin: 6px 0;
  background: var(--bg-glass); border: 1px solid var(--border);
  border-radius: 10px; font-size: 13px;
  transition: all 0.2s;
}
.credit-step:hover { border-color: var(--border-glow); }
.credit-step .step-num {
  width: 28px; height: 28px; border-radius: 50%;
  background: var(--accent-blue); color: #fff;
  display: flex; align-items: center; justify-content: center;
  font-size: 12px; font-weight: 700; flex-shrink: 0;
}
.credit-step .step-result {
  margin-left: auto; font-family: 'JetBrains Mono'; font-size: 12px;
  color: var(--accent-green); font-weight: 600; flex-shrink: 0;
}

/* Tier color stripes */
.tier-free::before { background: linear-gradient(90deg, #64748b, #94a3b8); }
.tier-starter::before { background: linear-gradient(90deg, var(--accent-green), var(--accent-cyan)); }
.tier-trader::before { background: linear-gradient(90deg, var(--accent-blue), var(--accent-purple)); }
.tier-builder::before { background: linear-gradient(90deg, var(--accent-amber), var(--accent-orange)); }
.tier-enterprise::before { background: linear-gradient(90deg, var(--accent-rose), var(--accent-purple)); }

/* ─── PLAY/PAUSE BUTTON ─── */
.play-btn {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 6px 16px; border-radius: 8px; border: 1px solid var(--border);
  background: var(--bg-glass); color: var(--text-secondary);
  font-family: 'Inter'; font-size: 12px; cursor: pointer;
  transition: all 0.2s; margin-bottom: 16px;
}
.play-btn:hover { border-color: var(--accent-blue); color: var(--text-primary); }
.play-btn.active { border-color: var(--accent-cyan); color: var(--accent-cyan); }

/* Paused state */
.flow-paused .arrow-particle { animation-play-state: paused !important; }
.flow-paused .flow-node.pulse { animation-play-state: paused !important; }

/* ─── SYSTEM DESIGN DIAGRAM ─── */
.sd-controls {
  display: flex; align-items: center; margin-bottom: 16px;
}
.sd-canvas {
  position: relative;
  width: 100%;
  height: 1400px;
  border: 1px solid var(--border);
  border-radius: 16px;
  background: var(--bg-card);
  overflow: hidden;
}
.sd-svg {
  position: absolute; inset: 0;
  width: 100%; height: 100%;
  pointer-events: none; z-index: 1;
}
.sd-zone {
  position: absolute; left: 0; right: 0;
  border-left: none;
  padding-left: 12px;
  background: rgba(255,255,255,0.01);
  border-bottom: 1px solid rgba(255,255,255,0.04);
}
.sd-zone:nth-child(odd) { background: rgba(255,255,255,0.015); }
.sd-zone-label {
  position: absolute; top: 8px; left: 12px;
  font-size: 10px; font-weight: 700;
  letter-spacing: 1.5px; text-transform: uppercase; opacity: 0.7;
}
.sd-node {
  position: absolute; z-index: 10;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 8px 10px;
  text-align: center;
  cursor: pointer;
  transition: all 0.3s;
  transform: translate(-50%, 0);
  display: flex; flex-direction: column; align-items: center; justify-content: center;
}
.sd-node:hover {
  border-color: var(--zone-color, var(--accent-blue));
  box-shadow: 0 0 16px rgba(99,102,241,0.2), 0 4px 20px rgba(0,0,0,0.4);
  transform: translate(-50%, -3px);
  z-index: 20;
}
.sd-node.sd-primary {
  border-color: rgba(99,102,241,0.3);
  background: rgba(17,24,39,0.95);
  box-shadow: 0 0 12px rgba(99,102,241,0.1);
}
.sd-node.sd-primary::after {
  content: '';
  position: absolute; inset: -1px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--zone-color, var(--accent-blue)), transparent);
  opacity: 0.1;
  z-index: -1;
}
.sd-node-icon { font-size: 20px; margin-bottom: 2px; }
.sd-node-label { font-size: 12px; font-weight: 700; white-space: nowrap; }
.sd-node-sub {
  font-size: 9px; color: var(--text-dim); line-height: 1.4;
  margin-top: 2px; font-family: 'JetBrains Mono';
}
.sd-paused .sd-node { transition: none; }

/* SVG Animation for connections */
.conn-line.animated {
  stroke-dasharray: 8, 8;
  animation: sdFlow 2s linear infinite;
}
@keyframes sdFlow {
  to { stroke-dashoffset: -16; }
}

/* System Design Modal */
.sd-modal-overlay {
  position: absolute; inset: 0;
  background: rgba(0,0,0,0.6);
  backdrop-filter: blur(4px);
  z-index: 100;
  display: flex; align-items: center; justify-content: center;
  opacity: 0; pointer-events: none;
  transition: opacity 0.2s ease;
}
.sd-modal-overlay.active {
  opacity: 1; pointer-events: auto;
}
.sd-modal {
  background: rgba(17, 24, 39, 0.95);
  border: 1px solid rgba(99, 102, 241, 0.3);
  box-shadow: 0 10px 40px rgba(0,0,0,0.5), 0 0 20px rgba(99, 102, 241, 0.1);
  border-radius: 12px;
  width: 400px;
  max-width: 90%;
  transform: translateY(20px) scale(0.95);
  transition: transform 0.2s cubic-bezier(0.34, 1.56, 0.64, 1);
}
.sd-modal-overlay.active .sd-modal {
  transform: translateY(0) scale(1);
}
.sd-modal-header {
  display: flex; align-items: center; gap: 12px;
  padding: 16px 20px;
  border-bottom: 1px solid rgba(255,255,255,0.1);
}
.sd-modal-icon { font-size: 24px; }
.sd-modal-title { flex: 1; }
.sd-modal-title h2 { margin: 0; font-size: 16px; font-weight: 600; color: white; }
.sd-modal-zone {
  display: inline-block; font-size: 10px; font-weight: 700;
  text-transform: uppercase; letter-spacing: 0.5px;
  margin-top: 4px; padding: 2px 6px;
  border-radius: 4px; border: 1px solid;
}
.sd-modal-close {
  background: none; border: none; color: var(--text-dim);
  font-size: 24px; cursor: pointer; padding: 0; line-height: 1;
}
.sd-modal-close:hover { color: white; }
.sd-modal-body {
  padding: 20px;
  font-size: 14px; line-height: 1.6; color: var(--text-secondary);
}

/* Scrollbar */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }

/* Responsive */
@media (max-width: 768px) {
  .header { padding: 12px 16px; flex-direction: column; gap: 12px; }
  .canvas-wrap { padding: 16px; }
  .flow-path { flex-direction: column; align-items: center; }
  .flow-arrow-animated { min-width: unset; min-height: 50px; transform: rotate(90deg); }
  .stats-bar { grid-template-columns: repeat(2, 1fr); }
  .tier-grid { grid-template-columns: 1fr; }
}