:root {
  --bg: #071018;
  --bg-elev: #0d1a24;
  --fg: #e7f0f7;
  --muted: #8aa0b4;
  --line: rgba(140, 180, 200, 0.18);
  --mint: #3dd6c6;
  --mint-dim: rgba(61, 214, 198, 0.14);
  --amber: #e8a838;
  --danger: #ff6b7a;
  --ok: #4ade80;
  --font-display: "Syne", system-ui, sans-serif;
  --font-body: "IBM Plex Sans", system-ui, sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, monospace;
  --radius: 10px;
  --max: 1080px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--fg);
  font-family: var(--font-body);
  font-size: 1.05rem;
  line-height: 1.55;
  background: var(--bg);
  overflow-x: hidden;
}

.atmosphere {
  position: fixed;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(ellipse 80% 55% at 15% -10%, rgba(61, 214, 198, 0.18), transparent 55%),
    radial-gradient(ellipse 60% 45% at 90% 10%, rgba(232, 168, 56, 0.1), transparent 50%),
    radial-gradient(ellipse 50% 40% at 50% 100%, rgba(40, 90, 120, 0.25), transparent 60%),
    linear-gradient(180deg, #071018 0%, #0a1520 45%, #071018 100%);
}

.atmosphere::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(120, 160, 180, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(120, 160, 180, 0.04) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.55), transparent 70%);
  animation: grid-drift 28s linear infinite;
}

@keyframes grid-drift {
  from {
    transform: translateY(0);
  }
  to {
    transform: translateY(48px);
  }
}

.top {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.85rem clamp(1rem, 4vw, 2rem);
  backdrop-filter: blur(14px);
  background: rgba(7, 16, 24, 0.72);
  border-bottom: 1px solid var(--line);
}

.brand {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.15rem;
  letter-spacing: 0.04em;
  color: var(--fg);
  text-decoration: none;
}

.nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 1rem;
  justify-content: flex-end;
}

.nav a {
  color: var(--muted);
  text-decoration: none;
  font-size: 0.92rem;
  font-weight: 500;
  transition: color 0.2s ease;
}

.nav a:hover,
.nav a:focus-visible {
  color: var(--mint);
}

.nav-ext {
  color: var(--amber) !important;
}

main {
  width: min(100% - 2rem, var(--max));
  margin: 0 auto;
  padding-bottom: 4rem;
}

.hero {
  padding: clamp(3.5rem, 12vh, 6.5rem) 0 2.5rem;
  animation: rise 0.8s ease both;
}

@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(18px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

.eyebrow {
  margin: 0 0 0.75rem;
  color: var(--mint);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.logo-mark {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(3.4rem, 12vw, 6.5rem);
  line-height: 0.95;
  letter-spacing: -0.03em;
  background: linear-gradient(120deg, #fff 20%, var(--mint) 55%, var(--amber) 110%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.lede {
  margin: 1.25rem 0 0;
  max-width: 36rem;
  color: var(--muted);
  font-size: 1.15rem;
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.75rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  border: 1px solid transparent;
  border-radius: 999px;
  padding: 0.7rem 1.2rem;
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
  transition: transform 0.15s ease, background 0.2s ease, border-color 0.2s ease;
}

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

.btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
  transform: none;
}

.btn.primary {
  background: var(--mint);
  color: #04201c;
}

.btn.ghost {
  background: transparent;
  border-color: var(--line);
  color: var(--fg);
}

.btn.ghost:hover {
  border-color: var(--mint);
}

.btn.tiny {
  padding: 0.35rem 0.75rem;
  font-size: 0.8rem;
  background: var(--mint-dim);
  color: var(--mint);
  border-color: transparent;
}

.boundary {
  margin-top: 1.75rem;
  max-width: 40rem;
  padding: 0.85rem 1rem;
  border-left: 3px solid var(--amber);
  color: var(--muted);
  font-size: 0.95rem;
}

.flow {
  margin: 0.5rem 0 3rem;
  padding: 1rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(13, 26, 36, 0.65);
  animation: rise 0.9s 0.12s ease both;
}

.flow-track {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 0.5rem;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--fg);
}

.flow-track .arrow {
  color: var(--mint);
  opacity: 0.7;
}

.section {
  padding: 3rem 0 1rem;
  border-top: 1px solid var(--line);
  animation: rise 0.7s ease both;
}

.section-head h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 4vw, 2.4rem);
  letter-spacing: -0.02em;
}

.section-head p {
  margin: 0.5rem 0 0;
  color: var(--muted);
  max-width: 40rem;
}

.badge.sim {
  display: inline-block;
  margin-left: 0.35rem;
  padding: 0.15rem 0.5rem;
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 0.65rem;
  vertical-align: middle;
  color: var(--amber);
  background: rgba(232, 168, 56, 0.12);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.filters {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 1.5rem 0 1rem;
}

.filter-btn {
  border: 1px solid var(--line);
  background: transparent;
  color: var(--muted);
  border-radius: 999px;
  padding: 0.4rem 0.85rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  cursor: pointer;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.filter-btn.active,
.filter-btn:hover {
  color: var(--bg);
  background: var(--mint);
  border-color: var(--mint);
}

.tool-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.tool {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(13, 26, 36, 0.55);
  overflow: hidden;
  transition: border-color 0.2s ease;
}

.tool:hover,
.tool[open] {
  border-color: rgba(61, 214, 198, 0.45);
}

.tool summary {
  list-style: none;
  cursor: pointer;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 0.5rem 1rem;
  padding: 1rem 1.1rem;
  align-items: baseline;
}

.tool summary::-webkit-details-marker {
  display: none;
}

.tool-name {
  font-family: var(--font-mono);
  font-size: 0.95rem;
  color: var(--mint);
}

.tool-summary {
  grid-column: 1 / -1;
  color: var(--muted);
  font-size: 0.95rem;
}

.tool-system {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--amber);
}

.tool-body {
  padding: 0 1.1rem 1.15rem;
  border-top: 1px solid var(--line);
}

.tool-body h4 {
  margin: 1rem 0 0.4rem;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--muted);
}

.kv {
  margin: 0;
  padding: 0;
  list-style: none;
}

.kv li {
  display: grid;
  grid-template-columns: minmax(7rem, 10rem) 1fr;
  gap: 0.5rem;
  padding: 0.35rem 0;
  border-bottom: 1px solid rgba(140, 180, 200, 0.08);
  font-size: 0.9rem;
}

.kv code {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--fg);
}

.chips {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin: 0.35rem 0 0;
  padding: 0;
  list-style: none;
}

.chips li {
  font-size: 0.8rem;
  padding: 0.25rem 0.55rem;
  border-radius: 6px;
  background: var(--mint-dim);
  color: var(--mint);
}

.steps {
  margin: 1.25rem 0;
  padding-left: 1.2rem;
  color: var(--muted);
}

.steps code,
.warn code,
.section-head code {
  font-family: var(--font-mono);
  font-size: 0.85em;
  color: var(--mint);
}

.warn {
  margin: 1rem 0;
  padding: 0.9rem 1rem;
  border: 1px solid rgba(232, 168, 56, 0.35);
  border-radius: var(--radius);
  background: rgba(232, 168, 56, 0.08);
  color: #f3d9a4;
  font-size: 0.92rem;
}

.code-panel {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: #050b11;
}

.code-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.55rem 0.85rem;
  border-bottom: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--muted);
}

.code {
  margin: 0;
  padding: 1rem;
  overflow: auto;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  line-height: 1.45;
  color: #cfe4f2;
  white-space: pre-wrap;
  word-break: break-word;
}

.code.compact {
  max-height: 12rem;
  background: #050b11;
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.code.result {
  margin-top: 0.75rem;
  border: 1px solid rgba(61, 214, 198, 0.35);
  border-radius: var(--radius);
  background: #041510;
}

.play-layout {
  display: grid;
  grid-template-columns: minmax(12rem, 16rem) 1fr;
  gap: 1rem;
  margin-top: 1.25rem;
}

@media (max-width: 780px) {
  .play-layout {
    grid-template-columns: 1fr;
  }
}

.play-list {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.scenario-btn {
  text-align: left;
  border: 1px solid var(--line);
  background: rgba(13, 26, 36, 0.55);
  color: var(--fg);
  border-radius: var(--radius);
  padding: 0.75rem 0.85rem;
  cursor: pointer;
  font-family: var(--font-body);
  transition: border-color 0.2s ease, background 0.2s ease;
}

.scenario-btn small {
  display: block;
  margin-top: 0.25rem;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.72rem;
}

.scenario-btn.active {
  border-color: var(--mint);
  background: var(--mint-dim);
}

.play-stage {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1rem;
  background: rgba(13, 26, 36, 0.45);
}

.play-meta h3 {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.25rem;
}

.muted {
  color: var(--muted);
}

.field-label {
  display: block;
  margin: 1rem 0 0.35rem;
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
}

.sim-banner {
  margin-top: 1rem;
  padding: 0.55rem 0.75rem;
  border-radius: 8px;
  background: rgba(232, 168, 56, 0.12);
  color: var(--amber);
  font-family: var(--font-mono);
  font-size: 0.78rem;
}

.hidden {
  display: none !important;
}

.health {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin: 1.25rem 0;
  padding: 0.85rem 1rem;
  border: 1px solid rgba(74, 222, 128, 0.3);
  border-radius: var(--radius);
  background: rgba(74, 222, 128, 0.06);
}

.pulse {
  width: 0.65rem;
  height: 0.65rem;
  border-radius: 50%;
  background: var(--ok);
  box-shadow: 0 0 0 0 rgba(74, 222, 128, 0.55);
  animation: pulse 2s ease infinite;
}

@keyframes pulse {
  70% {
    box-shadow: 0 0 0 10px rgba(74, 222, 128, 0);
  }
  100% {
    box-shadow: 0 0 0 0 rgba(74, 222, 128, 0);
  }
}

.table-wrap {
  overflow: auto;
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.events {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.88rem;
}

.events th,
.events td {
  padding: 0.65rem 0.85rem;
  text-align: left;
  border-bottom: 1px solid var(--line);
  white-space: nowrap;
}

.events th {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--muted);
  background: rgba(5, 11, 17, 0.8);
}

.events td {
  font-family: var(--font-mono);
  font-size: 0.8rem;
}

.ok-true {
  color: var(--ok);
}

.ok-false {
  color: var(--danger);
}

.foot {
  width: min(100% - 2rem, var(--max));
  margin: 0 auto 2.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--line);
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  justify-content: space-between;
  color: var(--muted);
  font-size: 0.9rem;
}

.foot a {
  color: var(--mint);
  text-decoration: none;
}

.foot a:hover {
  text-decoration: underline;
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation: none !important;
    transition: none !important;
    scroll-behavior: auto !important;
  }
}