:root {
  --bg: #f7f4ef;
  --bg-elevated: #fffcf8;
  --bg-soft: #efeae2;
  --ink: #1c1915;
  --ink-muted: #5c564c;
  --ink-faint: #8a8276;
  --accent: #c45c26;
  --accent-soft: rgba(196, 92, 38, 0.12);
  --teal: #2a7a6e;
  --teal-soft: rgba(42, 122, 110, 0.12);
  --blue: #3d6ea5;
  --blue-soft: rgba(61, 110, 165, 0.14);
  --danger: #b33a3a;
  --line: rgba(28, 25, 21, 0.08);
  --shadow: 0 18px 50px rgba(40, 30, 15, 0.07);
  --radius: 20px;
  --radius-sm: 12px;
  --font: "DM Sans", system-ui, sans-serif;
  --display: "Fraunces", Georgia, serif;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font);
  color: var(--ink);
  background:
    radial-gradient(1200px 600px at 10% -10%, #fff9f0 0%, transparent 55%),
    radial-gradient(900px 500px at 100% 0%, #f0ebe3 0%, transparent 50%),
    var(--bg);
  line-height: 1.55;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

.page {
  width: min(1080px, calc(100% - 2rem));
  margin: 0 auto;
  padding: 2.5rem 0 4rem;
}

/* Hero */
.hero {
  max-width: 720px;
  margin-bottom: 2.5rem;
}

.eyebrow {
  display: inline-block;
  margin: 0 0 0.75rem;
  padding: 0.35rem 0.75rem;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--accent);
  background: var(--accent-soft);
  border-radius: 999px;
}

.hero h1 {
  font-family: var(--display);
  font-size: clamp(1.85rem, 5vw, 3.25rem);
  font-weight: 600;
  line-height: 1.18;
  letter-spacing: -0.02em;
  margin: 0 0 1rem;
  color: var(--ink);
  overflow-wrap: break-word;
}

.lede {
  margin: 0;
  font-size: 1.125rem;
  line-height: 1.6;
  color: var(--ink-muted);
  max-width: 38em;
}

/* Demo panel */
.demo-panel {
  background: var(--bg-elevated);
  border: 1px solid var(--line);
  border-radius: calc(var(--radius) + 4px);
  box-shadow: var(--shadow);
  padding: clamp(1rem, 2.5vw, 1.5rem);
  margin-bottom: 3rem;
  overflow: hidden;
}

.demo-header {
  margin-bottom: 1.25rem;
}

.demo-header h2,
.explain h2,
.why-dehydrating h2,
.compare h2 {
  font-family: var(--display);
  font-size: clamp(1.35rem, 3vw, 1.85rem);
  font-weight: 600;
  letter-spacing: -0.015em;
  line-height: 1.25;
  margin: 0 0 0.5rem;
  overflow-wrap: break-word;
}

.demo-sub {
  margin: 0;
  color: var(--ink-muted);
  font-size: 0.98rem;
  line-height: 1.5;
  max-width: 40em;
}

.demo-stage {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
  gap: 1.5rem;
  align-items: start;
}

@media (max-width: 900px) {
  .demo-stage {
    grid-template-columns: 1fr;
  }
}

.canvas-wrap {
  position: relative;
  background: linear-gradient(160deg, #f3efe8 0%, #ebe4d8 100%);
  border-radius: var(--radius);
  border: 1px solid var(--line);
  overflow: hidden;
  min-height: 280px;
  min-width: 0;
}

#cellCanvas {
  display: block;
  width: 100%;
  height: auto;
  max-height: 420px;
  vertical-align: top;
}

/* Labels sit in reserved chrome bands so they never cover the cell */
.canvas-labels {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 2;
}

.label-in,
.label-out {
  position: absolute;
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--ink-faint);
  background: rgba(247, 244, 239, 0.88);
  padding: 0.28rem 0.55rem;
  border-radius: 999px;
  line-height: 1.2;
  white-space: nowrap;
}

.label-in {
  top: 10px;
  left: 12px;
  transform: none;
}

.label-out {
  bottom: 10px;
  right: 12px;
}

/* Controls */
.controls {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  min-width: 0;
}

.control-block {
  background: var(--bg-soft);
  border-radius: var(--radius-sm);
  padding: 1rem 1.1rem;
  border: 1px solid var(--line);
  min-width: 0;
}

.control-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 0.65rem 0.85rem;
  margin-bottom: 0.75rem;
  flex-wrap: wrap;
}

.control-top label {
  font-weight: 600;
  font-size: 0.92rem;
  line-height: 1.35;
  flex: 1 1 10rem;
  min-width: 0;
}

.value-pill {
  flex: 0 0 auto;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.3rem 0.7rem;
  border-radius: 999px;
  background: var(--teal-soft);
  color: var(--teal);
  text-transform: capitalize;
  white-space: nowrap;
  line-height: 1.3;
  transition: background 0.25s, color 0.25s;
}

.value-pill.warn {
  background: rgba(196, 92, 38, 0.14);
  color: var(--accent);
}

.value-pill.danger {
  background: rgba(179, 58, 58, 0.12);
  color: var(--danger);
}

input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 8px;
  border-radius: 999px;
  background: linear-gradient(90deg, #c8ddd8, #e8c4a8, #d4a090);
  outline: none;
  cursor: pointer;
  margin: 0.15rem 0;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--bg-elevated);
  border: 3px solid var(--accent);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.12);
  cursor: grab;
}

input[type="range"]::-moz-range-thumb {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--bg-elevated);
  border: 3px solid var(--accent);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.12);
  cursor: grab;
}

.slider-ends {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 1rem;
  margin-top: 0.5rem;
  font-size: 0.72rem;
  color: var(--ink-faint);
  line-height: 1.3;
}

.slider-ends span:first-child {
  text-align: left;
  max-width: 48%;
}

.slider-ends span:last-child {
  text-align: right;
  max-width: 48%;
}

.stat-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.75rem;
}

.stat {
  background: var(--bg-elevated);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  padding: 0.85rem 0.95rem;
  min-width: 0;
  overflow: hidden;
}

.stat-label {
  display: block;
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--ink-faint);
  margin-bottom: 0.3rem;
  line-height: 1.3;
}

.stat strong {
  display: block;
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 0.55rem;
  line-height: 1.25;
  overflow-wrap: anywhere;
  word-break: break-word;
}

.status-stat {
  grid-column: 1 / -1;
}

.status-stat strong {
  font-size: 1rem;
  color: var(--teal);
  margin-bottom: 0.35rem;
}

.state-hint {
  margin: 0;
  font-size: 0.85rem;
  line-height: 1.45;
  color: var(--ink-muted);
  overflow-wrap: break-word;
}

.bar {
  height: 6px;
  background: var(--bg-soft);
  border-radius: 999px;
  overflow: hidden;
}

.bar-fill {
  height: 100%;
  border-radius: 999px;
  width: 50%;
  max-width: 100%;
  transition: width 0.35s ease, background 0.35s ease;
}

.bar-fill.volume {
  background: var(--blue);
}

.bar-fill.salt {
  background: var(--accent);
}

.bar-fill.flow {
  background: var(--teal);
}

.preset-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.preset {
  font-family: inherit;
  font-size: 0.82rem;
  font-weight: 600;
  padding: 0.5rem 0.85rem;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--bg-elevated);
  color: var(--ink);
  cursor: pointer;
  line-height: 1.25;
  white-space: nowrap;
  transition: background 0.15s, border-color 0.15s, transform 0.1s;
}

.preset:hover {
  background: var(--bg-soft);
  border-color: rgba(28, 25, 21, 0.16);
}

.preset:active {
  transform: scale(0.97);
}

.preset.ghost {
  background: transparent;
  color: var(--ink-muted);
}

/* Explain cards */
.explain {
  margin-bottom: 3rem;
}

.cards {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
  margin-top: 1.25rem;
}

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

.card {
  background: var(--bg-elevated);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.35rem 1.35rem 1.45rem;
  box-shadow: 0 8px 24px rgba(40, 30, 15, 0.04);
  min-width: 0;
}

.card-num {
  font-family: var(--display);
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--accent);
  margin-bottom: 0.65rem;
  line-height: 1.2;
}

.card h3 {
  margin: 0 0 0.55rem;
  font-size: 1.08rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  line-height: 1.3;
}

.card p {
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.55;
  color: var(--ink-muted);
  overflow-wrap: break-word;
}

.card em {
  font-style: italic;
  color: var(--ink);
}

/* Why dehydrating */
.why-dehydrating {
  display: grid;
  grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr);
  gap: 1.5rem;
  margin-bottom: 3rem;
  align-items: start;
}

@media (max-width: 840px) {
  .why-dehydrating {
    grid-template-columns: 1fr;
  }
}

.why-copy {
  min-width: 0;
}

.why-copy p {
  color: var(--ink-muted);
  font-size: 1.02rem;
  line-height: 1.6;
  overflow-wrap: break-word;
}

.why-copy strong {
  color: var(--ink);
  font-weight: 600;
}

.steps {
  margin: 1.25rem 0;
  padding: 0;
  list-style: none;
  counter-reset: step;
}

.steps li {
  position: relative;
  padding: 0.95rem 0 0.95rem 3rem;
  border-top: 1px solid var(--line);
  color: var(--ink-muted);
  font-size: 0.96rem;
  line-height: 1.55;
  counter-increment: step;
  overflow-wrap: break-word;
}

.steps li:last-child {
  border-bottom: 1px solid var(--line);
}

.steps li::before {
  content: counter(step);
  position: absolute;
  left: 0;
  top: 0.95rem;
  width: 1.85rem;
  height: 1.85rem;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 0.8rem;
  font-weight: 700;
  line-height: 1;
  flex-shrink: 0;
}

.steps strong {
  display: block;
  color: var(--ink);
  margin-bottom: 0.2rem;
  line-height: 1.35;
}

.note {
  font-size: 0.92rem !important;
  line-height: 1.55 !important;
  padding: 1rem 1.1rem;
  background: var(--bg-soft);
  border-radius: var(--radius-sm);
  border-left: 3px solid var(--accent);
  margin: 0;
}

.formula-card {
  background: linear-gradient(165deg, #1f2a28 0%, #2a3d38 100%);
  color: #f5f0e8;
  border-radius: var(--radius);
  padding: 1.4rem 1.25rem;
  box-shadow: var(--shadow);
  position: sticky;
  top: 1.25rem;
  min-width: 0;
  overflow: hidden;
}

.formula-label {
  margin: 0 0 0.55rem;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: rgba(245, 240, 232, 0.55);
  line-height: 1.3;
}

.formula {
  margin: 0 0 1.35rem;
  font-family: var(--display);
  font-size: clamp(1.05rem, 2.2vw, 1.25rem);
  line-height: 1.4;
  font-weight: 500;
  overflow-wrap: break-word;
}

.mini-diagram {
  display: grid;
  grid-template-columns: auto minmax(2.5rem, 1fr) auto;
  align-items: center;
  gap: 0.65rem 0.75rem;
  padding: 1rem 0.9rem;
  background: rgba(255, 255, 255, 0.06);
  border-radius: var(--radius-sm);
  border: 1px solid rgba(255, 255, 255, 0.08);
  min-width: 0;
}

.mini-cell {
  width: 64px;
  height: 64px;
  flex-shrink: 0;
  border-radius: 50%;
  background: radial-gradient(circle at 35% 30%, #7eb8d8, #3d6ea5);
  display: grid;
  place-items: center;
  font-size: 0.72rem;
  font-weight: 700;
  color: #fff;
  line-height: 1;
  transition: transform 0.5s ease, width 0.5s ease, height 0.5s ease;
  box-shadow: inset 0 0 0 2px rgba(255, 255, 255, 0.2);
}

.mini-cell.shrunk {
  width: 44px;
  height: 44px;
  transform: none;
}

.mini-cell span {
  display: block;
  line-height: 1;
}

.arrows {
  font-size: 0.95rem;
  letter-spacing: 0.08em;
  color: #e8a878;
  font-weight: 600;
  text-align: center;
  white-space: nowrap;
  min-width: 0;
  overflow: hidden;
  text-overflow: clip;
  transition: opacity 0.3s;
  line-height: 1.2;
}

.mini-salt {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 0.2rem;
  font-weight: 700;
  font-size: 0.88rem;
  color: #f0c4a0;
  line-height: 1.25;
  min-width: 0;
  text-align: right;
}

.mini-salt > span:first-child {
  white-space: nowrap;
}

.mini-salt-sub {
  font-size: 0.65rem;
  font-weight: 500;
  color: rgba(245, 240, 232, 0.5);
  letter-spacing: 0.03em;
  white-space: nowrap;
  line-height: 1.2;
}

/* Compare */
.compare {
  margin-bottom: 2.5rem;
}

.compare-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.85rem;
  margin-top: 1.25rem;
}

@media (max-width: 700px) {
  .compare-grid {
    grid-template-columns: 1fr;
  }
}

.compare-card {
  text-align: left;
  font-family: inherit;
  background: var(--bg-elevated);
  border: 1.5px solid var(--line);
  border-radius: var(--radius);
  padding: 1.15rem 1.2rem;
  cursor: pointer;
  transition: border-color 0.2s, box-shadow 0.2s, background 0.2s;
  color: inherit;
  min-width: 0;
  overflow: hidden;
}

.compare-card:hover {
  border-color: rgba(28, 25, 21, 0.18);
}

.compare-card.active {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
  background: #fffaf5;
}

.compare-card h3 {
  margin: 0 0 0.3rem;
  font-size: 1.05rem;
  line-height: 1.3;
}

.compare-tag {
  margin: 0 0 0.7rem;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--accent);
  line-height: 1.3;
}

.compare-card p:last-child {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.5;
  color: var(--ink-muted);
  overflow-wrap: break-word;
}

.compare-card strong {
  color: var(--ink);
}

/* Footer */
.footer {
  border-top: 1px solid var(--line);
  padding-top: 1.5rem;
}

.footer p {
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.55;
  color: var(--ink-faint);
  max-width: 52em;
  overflow-wrap: break-word;
}

@media (max-width: 480px) {
  .page {
    width: min(1080px, calc(100% - 1.25rem));
    padding: 1.5rem 0 3rem;
  }

  .stat-grid {
    grid-template-columns: 1fr;
  }

  .status-stat {
    grid-column: auto;
  }

  .mini-diagram {
    grid-template-columns: 1fr;
    justify-items: center;
    text-align: center;
    gap: 0.75rem;
  }

  .mini-salt {
    align-items: center;
    text-align: center;
  }

  .arrows {
    letter-spacing: 0.2em;
  }
}