:root {
  --bg: #f5f7f4;
  --ink: #17201b;
  --muted: #66736a;
  --line: #d7ded7;
  --panel: #ffffff;
  --green: #1d7a49;
  --teal: #11727a;
  --amber: #c78612;
  --red: #b5483a;
  --shadow: 0 18px 45px rgba(20, 36, 28, 0.12);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 24px;
  padding: 28px 34px 22px;
  border-bottom: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.82);
  backdrop-filter: blur(14px);
  position: sticky;
  top: 0;
  z-index: 10;
}

.topbar h1 {
  max-width: 980px;
  margin: 3px 0 0;
  font-size: clamp(26px, 4vw, 46px);
  line-height: 1.02;
  letter-spacing: 0;
}

.eyebrow {
  margin: 0;
  color: var(--teal);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.status-pill {
  min-width: 124px;
  padding: 10px 14px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: #fff;
  color: var(--muted);
  text-align: center;
  font-size: 13px;
  font-weight: 800;
}

.status-pill.ok {
  color: var(--green);
  border-color: rgba(29, 122, 73, 0.35);
}

.status-pill.fail {
  color: var(--red);
  border-color: rgba(181, 72, 58, 0.35);
}

.demo-nav {
  display: flex;
  gap: 8px;
  padding: 10px 18px;
  border-bottom: 1px solid var(--line);
  background: #fff;
}

.demo-nav a {
  min-height: 34px;
  display: inline-flex;
  align-items: center;
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 0 12px;
  color: var(--ink);
  text-decoration: none;
  font-size: 13px;
  font-weight: 800;
}

.demo-nav a:hover,
.demo-nav a[aria-current="page"] {
  border-color: rgba(17, 114, 122, 0.4);
  background: rgba(17, 114, 122, 0.08);
  color: var(--teal);
}

.layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 360px;
  gap: 18px;
  padding: 18px;
}

.plant-panel,
.control-panel,
.wide-panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.plant-panel,
.wide-panel {
  padding: 22px;
}

.control-panel {
  padding: 18px;
}

.section-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
}

.section-head h2 {
  margin: 4px 0 0;
  font-size: 24px;
  letter-spacing: 0;
}

.compact {
  margin-bottom: 12px;
}

button {
  min-height: 42px;
  border: 0;
  border-radius: 6px;
  padding: 0 16px;
  background: var(--ink);
  color: #fff;
  font-weight: 800;
  cursor: pointer;
}

button:hover {
  background: #26392e;
}

button:disabled {
  cursor: wait;
  opacity: 0.78;
}

button.is-busy {
  position: relative;
  padding-left: 42px;
  background: #bf5a12;
}

button.is-busy::before {
  content: "";
  position: absolute;
  left: 16px;
  top: calc(50% - 8px);
  width: 16px;
  height: 16px;
  border: 2px solid rgba(255, 255, 255, 0.42);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

.plant-scene {
  position: relative;
  min-height: 380px;
  margin-top: 22px;
  border: 1px solid #dce5dc;
  border-radius: 8px;
  overflow: hidden;
  background:
    linear-gradient(180deg, rgba(229, 244, 237, 0.95), rgba(249, 251, 248, 0.95)),
    repeating-linear-gradient(90deg, rgba(17, 114, 122, 0.07) 0 1px, transparent 1px 64px);
}

.feedstock,
.gas-dome,
.control-node {
  position: absolute;
  display: grid;
  place-items: center;
  border: 2px solid rgba(23, 32, 27, 0.2);
  background: rgba(255, 255, 255, 0.88);
  font-weight: 900;
}

.feedstock {
  left: 48px;
  top: 130px;
  width: 150px;
  height: 92px;
  border-radius: 6px;
}

.digester {
  position: absolute;
  left: calc(50% - 150px);
  top: 76px;
  width: 300px;
  height: 230px;
  border: 4px solid #375044;
  border-radius: 12px 12px 90px 90px;
  overflow: hidden;
  background: #eef6ef;
  display: grid;
  place-items: center;
  font-weight: 900;
}

.liquid {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 58%;
  background: linear-gradient(180deg, #75b86f, #32683d);
  animation: wave 4s ease-in-out infinite;
}

.bubble {
  position: absolute;
  bottom: 36px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.75);
  animation: bubble 3s linear infinite;
}

.b1 { left: 84px; animation-delay: 0s; }
.b2 { left: 150px; animation-delay: 0.8s; }
.b3 { left: 210px; animation-delay: 1.5s; }

.pipe {
  position: absolute;
  right: 195px;
  top: 150px;
  width: 150px;
  height: 18px;
  background: #375044;
}

.gas-dome {
  right: 60px;
  top: 92px;
  width: 140px;
  height: 130px;
  border-radius: 70px 70px 8px 8px;
}

.flame {
  width: 26px;
  height: 42px;
  border-radius: 50% 50% 50% 0;
  background: linear-gradient(180deg, #ffcf54, #e66b2b);
  transform: rotate(-45deg);
  animation: flame 1.1s ease-in-out infinite;
}

.control-node {
  right: 60px;
  bottom: 44px;
  width: 180px;
  height: 78px;
  border-radius: 8px;
  gap: 4px;
}

.control-node strong {
  color: var(--green);
}

.flow {
  position: absolute;
  right: -150px;
  height: 6px;
  width: 140px;
  background: repeating-linear-gradient(90deg, var(--green) 0 16px, transparent 16px 30px);
  animation: flow 1.2s linear infinite;
}

.metrics {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  margin-top: 16px;
}

.metrics article {
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fbfcfb;
}

.metrics span {
  color: var(--muted);
  font-size: 13px;
  font-weight: 700;
}

.metrics strong {
  display: block;
  margin-top: 8px;
  font-size: 24px;
}

.controls {
  display: grid;
  gap: 13px;
}

.control label {
  display: flex;
  justify-content: space-between;
  color: var(--muted);
  font-size: 13px;
  font-weight: 800;
}

input[type="range"] {
  width: 100%;
  accent-color: var(--green);
}

.control-panel button {
  width: 100%;
  margin-top: 18px;
}

.wide-panel {
  grid-column: 1 / -1;
}

.two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px;
}

.chart {
  min-height: 260px;
  display: flex;
  align-items: flex-end;
  gap: 10px;
  padding-top: 20px;
}

.bar {
  flex: 1;
  min-width: 42px;
  background: linear-gradient(180deg, var(--teal), var(--green));
  border-radius: 6px 6px 0 0;
  position: relative;
  transition: height 500ms ease;
}

.bar span {
  position: absolute;
  left: 50%;
  bottom: -26px;
  transform: translateX(-50%);
  font-size: 12px;
  color: var(--muted);
  font-weight: 800;
}

pre {
  white-space: pre-wrap;
  background: #102018;
  color: #dff6e9;
  border-radius: 8px;
  padding: 16px;
  overflow: auto;
  min-height: 210px;
}

.vision-list {
  margin: 18px 0 0;
  padding-left: 20px;
  color: var(--muted);
  line-height: 1.7;
  font-weight: 650;
}

@keyframes wave {
  0%, 100% { height: 56%; }
  50% { height: 61%; }
}

@keyframes bubble {
  0% { transform: translateY(0) scale(0.75); opacity: 0; }
  20% { opacity: 0.9; }
  100% { transform: translateY(-155px) scale(1.2); opacity: 0; }
}

@keyframes flow {
  from { background-position: 0 0; }
  to { background-position: 30px 0; }
}

@keyframes flame {
  0%, 100% { transform: rotate(-45deg) scale(1); }
  50% { transform: rotate(-45deg) scale(1.12); }
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

@media (max-width: 980px) {
  .demo-nav {
    overflow-x: auto;
  }

  .demo-nav a {
    white-space: nowrap;
  }

  .layout,
  .two-col {
    grid-template-columns: 1fr;
  }

  .metrics {
    grid-template-columns: repeat(2, 1fr);
  }

  .topbar {
    align-items: flex-start;
    flex-direction: column;
  }

  .feedstock,
  .gas-dome,
  .control-node {
    transform: scale(0.82);
  }
}