/* Master&Commander — Dark Nautical Theme */
:root {
  --bg: #0a0f1a;
  --bg-card: #111827;
  --bg-node: #1a2332;
  --navy: #1e3a5f;
  --cyan: #0ea5e9;
  --green: #10b981;
  --red: #ef4444;
  --orange: #f59e0b;
  --text: #e2e8f0;
  --text-dim: #94a3b8;
  --text-muted: #64748b;
  --border: #1e293b;
  --glow: rgba(14,165,233,0.15);
  --font-mono: 'SF Mono','Fira Code','Cascadia Code',monospace;
  --font-sans: -apple-system,BlinkMacSystemFont,'Segoe UI',Inter,sans-serif;
}
*,*::before,*::after { margin:0; padding:0; box-sizing:border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  overflow-x: hidden;
}

/* Wave background pattern */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background:
    radial-gradient(ellipse at 20% 50%, rgba(14,165,233,0.04) 0%, transparent 60%),
    radial-gradient(ellipse at 80% 20%, rgba(30,58,95,0.08) 0%, transparent 50%);
  pointer-events: none;
  z-index: 0;
}

a { color: var(--cyan); text-decoration: none; }
a:hover { text-decoration: underline; }

/* Navigation */
nav {
  position: fixed;
  top: 0;
  width: 100%;
  z-index: 100;
  background: rgba(10,15,26,0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  padding: 0.75rem 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
nav .logo {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}
nav .logo span { color: var(--cyan); }
nav ul { list-style: none; display: flex; gap: 1.5rem; }
nav ul a { color: var(--text-dim); font-size: 0.875rem; transition: color 0.2s; }
nav ul a:hover { color: var(--cyan); text-decoration: none; }

/* Sections */
section {
  position: relative;
  z-index: 1;
  max-width: 1200px;
  margin: 0 auto;
  padding: 5rem 2rem;
}

/* Hero */
.hero {
  text-align: center;
  padding-top: 8rem;
  padding-bottom: 4rem;
  max-width: 800px;
}
.hero h1 {
  font-size: clamp(2.5rem, 6vw, 4rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.1;
  margin-bottom: 1.5rem;
}
.hero h1 .highlight {
  background: linear-gradient(135deg, var(--cyan), var(--green));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero .tagline {
  font-size: 1.25rem;
  color: var(--text-dim);
  margin-bottom: 2.5rem;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}
.hero .badges {
  display: flex;
  gap: 0.75rem;
  justify-content: center;
  flex-wrap: wrap;
}
.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.4rem 1rem;
  font-size: 0.8rem;
  color: var(--text-dim);
  font-family: var(--font-mono);
}
.badge .dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 6px var(--green);
}

/* Flow Diagram Section */
.flow-section {
  max-width: 1400px;
  padding-top: 2rem;
}
.flow-section h2 {
  text-align: center;
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}
.flow-section .subtitle {
  text-align: center;
  color: var(--text-dim);
  margin-bottom: 2rem;
  font-size: 0.95rem;
}

#flow-container {
  position: relative;
  width: 100%;
  min-height: 500px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
}
#flow-svg {
  width: 100%;
  height: 100%;
  display: block;
}

/* Flow nodes */
.flow-node {
  cursor: pointer;
  transition: filter 0.2s;
}
.flow-node:hover { filter: brightness(1.2); }
.flow-node rect, .flow-node .node-bg {
  rx: 8;
  ry: 8;
  stroke-width: 1.5;
  transition: stroke 0.2s, filter 0.2s;
}
.flow-node.active rect, .flow-node.active .node-bg {
  stroke: var(--cyan) !important;
  filter: drop-shadow(0 0 8px rgba(14,165,233,0.4));
}
.flow-node text {
  font-family: var(--font-sans);
  fill: var(--text);
  font-size: 13px;
  pointer-events: none;
}
.flow-node .node-icon {
  font-size: 18px;
}

/* Connection lines */
.flow-line {
  stroke: var(--navy);
  stroke-width: 2;
  fill: none;
  stroke-dasharray: 8 4;
}
/* Animated pulse */
.flow-pulse {
  fill: var(--cyan);
  opacity: 0;
}
.flow-pulse.active {
  animation: pulseDot 3s infinite ease-in-out;
}
@keyframes pulseDot {
  0% { opacity: 0; offset-distance: 0%; }
  10% { opacity: 1; }
  90% { opacity: 1; }
  100% { opacity: 0; offset-distance: 100%; }
}

/* Detail panel */
#detail-panel {
  position: absolute;
  top: 1rem;
  right: 1rem;
  width: 280px;
  background: rgba(17,24,39,0.95);
  backdrop-filter: blur(8px);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1.25rem;
  opacity: 0;
  transform: translateX(10px);
  transition: opacity 0.3s, transform 0.3s;
  pointer-events: none;
  z-index: 10;
}
#detail-panel.visible {
  opacity: 1;
  transform: translateX(0);
  pointer-events: auto;
}
#detail-panel h3 {
  font-size: 1rem;
  margin-bottom: 0.5rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
#detail-panel p {
  font-size: 0.85rem;
  color: var(--text-dim);
  line-height: 1.5;
}
#detail-panel .detail-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-top: 0.75rem;
}
#detail-panel .detail-tag {
  font-size: 0.7rem;
  font-family: var(--font-mono);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 0.15rem 0.5rem;
  color: var(--cyan);
}
#detail-close {
  position: absolute;
  top: 0.5rem;
  right: 0.75rem;
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 1.1rem;
  line-height: 1;
}

/* How It Works */
.steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2rem;
  margin-top: 2rem;
}
.step {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 2rem;
  position: relative;
}
.step-number {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--cyan);
  background: rgba(14,165,233,0.1);
  border: 1px solid rgba(14,165,233,0.2);
  border-radius: 999px;
  padding: 0.2rem 0.7rem;
  display: inline-block;
  margin-bottom: 1rem;
}
.step h3 {
  font-size: 1.1rem;
  margin-bottom: 0.5rem;
}
.step p {
  color: var(--text-dim);
  font-size: 0.9rem;
}
.step code {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 0.15rem 0.4rem;
  color: var(--green);
}

/* Section headers */
.section-header {
  text-align: center;
  margin-bottom: 3rem;
}
.section-header h2 {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}
.section-header p {
  color: var(--text-dim);
  max-width: 600px;
  margin: 0 auto;
}

/* Features grid */
.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
}
.feature {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1.75rem;
  transition: border-color 0.2s;
}
.feature:hover { border-color: var(--navy); }
.feature-icon {
  font-size: 1.5rem;
  margin-bottom: 0.75rem;
}
.feature h3 {
  font-size: 1rem;
  margin-bottom: 0.4rem;
}
.feature p {
  font-size: 0.85rem;
  color: var(--text-dim);
}

/* Alerts table */
.alerts-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}
.alerts-table th {
  text-align: left;
  padding: 0.75rem 1rem;
  border-bottom: 2px solid var(--border);
  color: var(--text-dim);
  font-weight: 600;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.alerts-table td {
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--border);
}
.alerts-table tr:last-child td { border-bottom: none; }
.alerts-table tr:hover td { background: rgba(14,165,233,0.03); }
.alerts-table .alert-icon { font-size: 1.1rem; }
.alerts-table code {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 0.1rem 0.4rem;
  color: var(--orange);
}
.table-wrap {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 10px;
  overflow-x: auto;
  margin-top: 2rem;
}

/* WhatsApp Demo */
.wa-demo {
  max-width: 420px;
  margin: 2rem auto 0;
  background: #0b141a;
  border-radius: 12px;
  border: 1px solid var(--border);
  overflow: hidden;
}
.wa-header {
  background: #1f2c34;
  padding: 0.75rem 1rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  border-bottom: 1px solid #2a3942;
}
.wa-avatar {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--navy);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
}
.wa-name {
  font-size: 0.9rem;
  font-weight: 600;
}
.wa-status {
  font-size: 0.7rem;
  color: var(--text-muted);
}
.wa-chat {
  padding: 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  max-height: 500px;
}
.wa-msg {
  max-width: 85%;
  padding: 0.5rem 0.75rem;
  border-radius: 8px;
  font-size: 0.85rem;
  line-height: 1.45;
  position: relative;
}
.wa-msg.sent {
  align-self: flex-end;
  background: #005c4b;
  border-bottom-right-radius: 2px;
}
.wa-msg.recv {
  align-self: flex-start;
  background: #1f2c34;
  border-bottom-left-radius: 2px;
}
.wa-msg .time {
  font-size: 0.65rem;
  color: rgba(255,255,255,0.45);
  float: right;
  margin-left: 0.5rem;
  margin-top: 0.25rem;
}
.wa-msg pre {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  white-space: pre-wrap;
  margin-top: 0.25rem;
  line-height: 1.4;
}

/* Fleet Section */
.fleet-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
  margin-top: 2rem;
}
.fleet-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 2rem;
}
.fleet-card h3 {
  font-size: 1.1rem;
  margin-bottom: 0.5rem;
}
.fleet-card p {
  font-size: 0.85rem;
  color: var(--text-dim);
}
.fleet-badge {
  display: inline-block;
  font-size: 0.7rem;
  font-family: var(--font-mono);
  background: rgba(16,185,129,0.1);
  border: 1px solid rgba(16,185,129,0.2);
  color: var(--green);
  border-radius: 4px;
  padding: 0.15rem 0.5rem;
  margin-bottom: 1rem;
}

/* CTA */
.cta {
  text-align: center;
  padding: 6rem 2rem;
}
.cta h2 {
  font-size: 2.5rem;
  font-weight: 800;
  margin-bottom: 1rem;
}
.cta p {
  color: var(--text-dim);
  max-width: 500px;
  margin: 0 auto 2rem;
}
.cta-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--cyan);
  color: #fff;
  border: none;
  border-radius: 8px;
  padding: 0.85rem 2rem;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s, transform 0.1s;
  text-decoration: none;
}
.cta-btn:hover {
  background: #0284c7;
  text-decoration: none;
  transform: translateY(-1px);
}
.cta-btn:active { transform: translateY(0); }

/* Footer */
footer {
  position: relative;
  z-index: 1;
  text-align: center;
  padding: 2rem;
  border-top: 1px solid var(--border);
  color: var(--text-muted);
  font-size: 0.8rem;
}

/* Responsive */
@media (max-width: 768px) {
  nav ul { display: none; }
  section { padding: 3rem 1rem; }
  .hero { padding-top: 6rem; }
  #detail-panel {
    position: fixed;
    inset: auto 0.5rem 0.5rem 0.5rem;
    width: auto;
    max-height: 40vh;
    overflow-y: auto;
  }
  .alerts-table { font-size: 0.8rem; }
  .alerts-table th, .alerts-table td { padding: 0.5rem; }
  .wa-demo { margin: 2rem 0 0; }
  #flow-container { min-height: 600px; }
}

@media (max-width: 480px) {
  .hero h1 { font-size: 2rem; }
  .features { grid-template-columns: 1fr; }
  .steps { grid-template-columns: 1fr; }
}