:root {
  --bg: #000000;
  --ink: #e9ebf4;
  --muted: #a6acc4;
  --purple: #a78bfa;
  --blue: #7aa2ff;
  --green: #6fe7b7;
  --gold: #e9bb5f;
  --card: rgba(10, 10, 10, 0.85);
  --line: rgba(233, 235, 244, 0.08);
  --border: rgba(122, 162, 255, 0.18);
  --font-display: "Playfair Display", Georgia, serif;
  --font-body: "Inter", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
}

* { box-sizing: border-box; }
html, body { margin: 0; min-height: 100%; background: var(--bg); color: var(--ink); font-family: var(--font-body); }

/* ---- Atmosphere: pure black void, stars only, no other colouring ---- */
.stars {
  position: fixed; inset: 0; z-index: -1; pointer-events: none;
  background-image:
    radial-gradient(1px 1px at 8% 12%, rgba(201,206,223,0.5) 50%, transparent 51%),
    radial-gradient(1px 1px at 18% 38%, rgba(201,206,223,0.36) 50%, transparent 51%),
    radial-gradient(1.5px 1.5px at 27% 74%, rgba(201,206,223,0.58) 50%, transparent 51%),
    radial-gradient(1px 1px at 34% 22%, rgba(201,206,223,0.3) 50%, transparent 51%),
    radial-gradient(2px 2px at 42% 61%, rgba(201,206,223,0.64) 50%, transparent 51%),
    radial-gradient(1px 1px at 51% 9%, rgba(201,206,223,0.4) 50%, transparent 51%),
    radial-gradient(1.5px 1.5px at 58% 47%, rgba(201,206,223,0.52) 50%, transparent 51%),
    radial-gradient(1px 1px at 65% 83%, rgba(201,206,223,0.34) 50%, transparent 51%),
    radial-gradient(1px 1px at 72% 29%, rgba(201,206,223,0.61) 50%, transparent 51%),
    radial-gradient(2px 2px at 79% 55%, rgba(201,206,223,0.44) 50%, transparent 51%),
    radial-gradient(1px 1px at 86% 17%, rgba(201,206,223,0.55) 50%, transparent 51%),
    radial-gradient(1.5px 1.5px at 92% 68%, rgba(201,206,223,0.38) 50%, transparent 51%),
    radial-gradient(1px 1px at 4% 91%, rgba(201,206,223,0.47) 50%, transparent 51%),
    radial-gradient(1px 1px at 13% 55%, rgba(201,206,223,0.29) 50%, transparent 51%),
    radial-gradient(2px 2px at 22% 6%, rgba(201,206,223,0.6) 50%, transparent 51%),
    radial-gradient(1px 1px at 31% 94%, rgba(201,206,223,0.33) 50%, transparent 51%),
    radial-gradient(1.5px 1.5px at 38% 33%, rgba(201,206,223,0.5) 50%, transparent 51%),
    radial-gradient(1px 1px at 47% 78%, rgba(201,206,223,0.41) 50%, transparent 51%),
    radial-gradient(1px 1px at 55% 15%, rgba(201,206,223,0.57) 50%, transparent 51%),
    radial-gradient(2px 2px at 63% 41%, rgba(201,206,223,0.35) 50%, transparent 51%),
    radial-gradient(1px 1px at 70% 66%, rgba(201,206,223,0.62) 50%, transparent 51%),
    radial-gradient(1.5px 1.5px at 77% 88%, rgba(201,206,223,0.31) 50%, transparent 51%),
    radial-gradient(1px 1px at 84% 3%, rgba(201,206,223,0.49) 50%, transparent 51%),
    radial-gradient(1px 1px at 90% 52%, rgba(201,206,223,0.4) 50%, transparent 51%),
    radial-gradient(1.5px 1.5px at 97% 26%, rgba(201,206,223,0.56) 50%, transparent 51%),
    radial-gradient(5px 5px at 12% 24%, rgba(201,206,223,0.75) 0%, rgba(201,206,223,0.26) 45%, transparent 72%),
    radial-gradient(6px 6px at 45% 12%, rgba(201,206,223,0.68) 0%, rgba(201,206,223,0.23) 45%, transparent 72%),
    radial-gradient(5px 5px at 68% 58%, rgba(201,206,223,0.7) 0%, rgba(201,206,223,0.24) 45%, transparent 72%),
    radial-gradient(6px 6px at 88% 80%, rgba(201,206,223,0.65) 0%, rgba(201,206,223,0.22) 45%, transparent 72%),
    radial-gradient(5px 5px at 25% 85%, rgba(201,206,223,0.72) 0%, rgba(201,206,223,0.25) 45%, transparent 72%);
}
@media (prefers-reduced-motion: no-preference) {
  .stars { animation: twinkle 7.5s ease-in-out infinite; }
}
@keyframes twinkle { 0%, 100% { opacity: .72; } 50% { opacity: 1; } }

.top {
  display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between;
  gap: 1rem; padding: 1rem 1.25rem; border-bottom: 1px solid var(--line);
}
.brand { display: flex; gap: 0.75rem; align-items: center; }
.brand h1 { margin: 0; font-family: var(--font-display); font-weight: 600; font-size: 1.3rem; letter-spacing: 0.01em; }
.sub { margin: 0; color: var(--muted); font-size: 0.8rem; }
.crystal-mark {
  width: 36px; height: 36px;
  background: linear-gradient(135deg, var(--purple), var(--blue));
  clip-path: polygon(50% 0%, 100% 38%, 82% 100%, 18% 100%, 0% 38%);
  box-shadow: 0 0 24px rgba(167, 139, 250, 0.45);
}
.meta { display: flex; flex-wrap: wrap; gap: 0.4rem; align-items: center; }
.pill {
  font-size: 0.7rem; padding: 0.25rem 0.55rem; border-radius: 999px;
  border: 1px solid var(--border); color: var(--blue); background: rgba(122, 162, 255, 0.08);
}
.pill.gold { color: var(--gold); border-color: rgba(233, 187, 95, 0.35); background: rgba(233, 187, 95, 0.08); }
.pill.muted { color: var(--muted); }

.nav {
  display: flex; flex-wrap: wrap; gap: 0.35rem; padding: 0.6rem 1.25rem;
  border-bottom: 1px solid var(--line); background: rgba(0,0,0,0.4);
}
.nav-btn {
  background: transparent; border: 1px solid transparent; color: var(--muted);
  padding: 0.4rem 0.75rem; border-radius: 8px; cursor: pointer; font-size: 0.85rem; font-family: var(--font-body);
}
.nav-btn:hover { color: var(--ink); border-color: var(--border); }
.nav-btn.active { color: #050208; background: var(--purple); border-color: var(--purple); font-weight: 600; }

main { padding: 1.25rem; max-width: 1100px; margin: 0 auto; }
.panel { display: none; animation: fade 0.25s ease; }
.panel.active { display: block; }
@keyframes fade { from { opacity: 0; transform: translateY(4px); } to { opacity: 1; transform: none; } }

.panel-head { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 0.75rem; margin-bottom: 0.75rem; }
.panel-head h2 { margin: 0; font-family: var(--font-display); font-weight: 600; font-size: 1.15rem; }

.card {
  background: var(--card); border: 1px solid var(--border); border-radius: 12px;
  padding: 1rem 1.1rem; margin-bottom: 0.75rem;
}
.hero h2 { margin-top: 0; font-family: var(--font-display); font-weight: 600; font-size: 1.3rem; }
.hero-grid { display: grid; grid-template-columns: 1.4fr 1fr; gap: 0.75rem; }
@media (max-width: 800px) { .hero-grid { grid-template-columns: 1fr; } }

.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 0.5rem; margin: 1rem 0; }
.stats .n { display: block; font-size: 1.4rem; color: var(--blue); font-weight: 700; }
.stats .l { font-size: 0.7rem; color: var(--muted); }
@media (max-width: 600px) { .stats { grid-template-columns: 1fr 1fr; } }

.row { display: flex; flex-wrap: wrap; gap: 0.5rem; }
.btn {
  background: rgba(122, 162, 255, 0.1); border: 1px solid var(--border); color: var(--ink);
  padding: 0.45rem 0.9rem; border-radius: 8px; cursor: pointer; font-size: 0.85rem; font-family: var(--font-body);
}
.btn:hover { border-color: var(--blue); }
.btn.primary { background: linear-gradient(135deg, var(--purple), var(--blue)); color: #050208; border: none; font-weight: 600; }

.decode-list { margin: 0; padding-left: 1.1rem; color: var(--muted); font-size: 0.9rem; }
.decode-list b { color: var(--blue); }

.canvas {
  width: 100%; height: 360px; border-radius: 12px; border: 1px solid var(--border);
  background: var(--bg); display: block;
}
.hint { color: var(--muted); font-size: 0.8rem; }

.layer-toggles { display: flex; gap: 0.35rem; flex-wrap: wrap; }
.chip {
  border: 1px solid var(--border); background: transparent; color: var(--muted);
  padding: 0.3rem 0.65rem; border-radius: 999px; cursor: pointer; font-size: 0.75rem;
}
.chip.on { color: #050208; background: var(--blue); border-color: var(--blue); font-weight: 600; }

.mesh-wrap { display: grid; grid-template-columns: 1fr 240px; gap: 0.75rem; }
@media (max-width: 800px) { .mesh-wrap { grid-template-columns: 1fr; } }
.mesh-svg { width: 100%; height: 280px; background: var(--card); border-radius: 12px; border: 1px solid var(--border); }
.side h3 { margin-top: 0; font-family: var(--font-display); font-weight: 600; }

.pipeline { display: flex; flex-wrap: wrap; gap: 0.5rem; margin-bottom: 0.75rem; }
.pipe-step {
  flex: 1 1 100px; min-width: 90px; padding: 0.65rem; border-radius: 10px;
  border: 1px solid var(--border); background: var(--card); cursor: pointer; text-align: center;
}
.pipe-step h4 { margin: 0 0 0.2rem; font-size: 0.75rem; letter-spacing: 0.06em; color: var(--muted); }
.pipe-step p { margin: 0; font-size: 0.7rem; color: var(--muted); }
.pipe-step.active { border-color: var(--blue); box-shadow: 0 0 20px rgba(122, 162, 255, 0.2); }
.pipe-step.active h4 { color: var(--blue); }
.pipe-step.done { border-color: rgba(233, 187, 95, 0.4); }
.pipe-step.done h4 { color: var(--gold); }

.code {
  background: var(--bg); border: 1px solid var(--border); border-radius: 10px;
  padding: 0.85rem; overflow: auto; font-size: 0.75rem; color: var(--green); max-height: 280px;
  font-family: var(--font-mono);
}

.econ-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 0.75rem; }
@media (max-width: 800px) { .econ-grid { grid-template-columns: 1fr; } }
label { display: block; font-size: 0.75rem; color: var(--muted); margin: 0.5rem 0 0.2rem; }
input[type="range"] { width: 100%; }
input[type="number"] {
  width: 100%; padding: 0.4rem; border-radius: 6px; border: 1px solid var(--border);
  background: var(--bg); color: var(--ink); font-family: var(--font-body);
}

.routes { display: grid; grid-template-columns: repeat(auto-fill, minmax(160px, 1fr)); gap: 0.5rem; }
.route-card {
  border: 1px solid var(--border); border-radius: 10px; padding: 0.75rem; background: var(--card);
}
.route-card h4 { margin: 0 0 0.25rem; }
.route-card .time { color: var(--blue); font-size: 0.9rem; }
.badge {
  display: inline-block; font-size: 0.65rem; padding: 0.15rem 0.4rem; border-radius: 4px;
  text-transform: uppercase; letter-spacing: 0.05em;
}
.badge.live { background: rgba(122, 162, 255, 0.2); color: var(--blue); }
.badge.beta { background: rgba(167, 139, 250, 0.2); color: var(--purple); }
.badge.planned { background: rgba(166, 172, 196, 0.2); color: var(--muted); }

.journey { color: var(--muted); line-height: 1.6; }
.log { list-style: none; padding: 0; margin: 0; font-size: 0.8rem; color: var(--muted); max-height: 360px; overflow: auto; }
.log li { padding: 0.35rem 0; border-bottom: 1px solid var(--line); font-family: var(--font-mono); }
.log .tag { color: var(--gold); margin-right: 0.4rem; }

.toast {
  position: fixed; bottom: 1.25rem; left: 50%; transform: translateX(-50%) translateY(20px);
  background: #0a0a0a; border: 1px solid var(--blue); color: var(--ink);
  padding: 0.6rem 1rem; border-radius: 999px; opacity: 0; pointer-events: none;
  transition: 0.25s ease; z-index: 50; font-size: 0.85rem;
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

.foot {
  text-align: center; padding: 1.5rem; color: var(--muted); font-size: 0.75rem;
  border-top: 1px solid var(--line); margin-top: 2rem;
}
.foot a { color: var(--blue); }
.muted { color: var(--muted); }

.modal-backdrop {
  position: fixed; inset: 0; background: rgba(0,0,0,0.75);
  display: none; align-items: center; justify-content: center; z-index: 40;
}
.modal-backdrop.open { display: flex; }
.modal {
  background: #0a0a0a; border: 1px solid var(--border); border-radius: 14px;
  padding: 1.25rem; min-width: 280px; max-width: 90vw;
}
.modal h3 { font-family: var(--font-display); font-weight: 600; }
.epoch-label { font-size: 0.7rem; color: var(--muted); display: flex; align-items: center; gap: 0.35rem; }
.epoch-label select {
  background: var(--bg); color: var(--ink); border: 1px solid var(--border);
  border-radius: 6px; padding: 0.25rem 0.4rem; font-family: var(--font-body);
}
.code.small { max-height: 200px; font-size: 0.7rem; }
.table { width: 100%; border-collapse: collapse; font-size: 0.8rem; margin-top: 0.75rem; }
.table th, .table td { text-align: left; padding: 0.45rem 0.35rem; border-bottom: 1px solid var(--line); }
.table th { color: var(--muted); font-weight: 500; }
.mono { font-family: var(--font-mono); font-size: 0.72rem; }
.receipt-status { font-size: 0.7rem; padding: 0.15rem 0.4rem; border-radius: 4px; }
.receipt-status.pending { background: rgba(233, 187, 95, 0.15); color: var(--gold); }
.receipt-status.confirmed { background: rgba(122, 162, 255, 0.15); color: var(--blue); }
.wrap-form { align-items: flex-end; gap: 0.75rem; }
.wrap-form label { margin: 0; }
.wrap-form select, .wrap-form input[type="number"] { display: block; min-width: 120px; margin-top: 0.25rem; }
.route-list { list-style: none; padding: 0; margin: 0 0 1rem; display: grid; gap: 0.5rem; }
.route-list li {
  display: flex; justify-content: space-between; padding: 0.75rem 1rem;
  background: var(--card); border: 1px solid var(--border); border-radius: 10px;
}
.route-list .dest { font-weight: 600; }
.route-list .time { color: var(--blue); font-size: 0.9rem; }
.route-list small { color: var(--muted); }
.layer-bar {
  border: 1px solid var(--border); border-radius: 10px; margin-bottom: 0.5rem;
  background: var(--card); cursor: pointer; overflow: hidden;
}
.layer-bar h4 {
  margin: 0; padding: 0.75rem 1rem; font-size: 0.9rem; color: var(--blue);
}
.layer-body {
  max-height: 0; overflow: hidden; padding: 0 1rem;
  color: var(--muted); font-size: 0.85rem; transition: max-height 0.25s ease, padding 0.25s ease;
}
.layer-bar.expanded .layer-body { max-height: 120px; padding: 0 1rem 0.85rem; }
.log-box {
  background: var(--bg); border: 1px solid var(--border); border-radius: 10px;
  padding: 0.75rem; max-height: 400px; overflow: auto; font-family: var(--font-mono);
  font-size: 0.75rem; color: var(--muted);
}
.line-info { padding: 0.25rem 0; border-bottom: 1px solid var(--line); }
.node-circle { cursor: pointer; }
.node-circle:hover { fill: #1a1a24; }