/* Lab Notes design system: shared tokens with lindgreendavid.com. One ground, one ink, one accent;
   surfaces separate by tone steps, not lines or shadows. Light and a warm dark theme. */
@font-face {
  font-family: "Geist Variable";
  font-style: normal;
  font-display: swap;
  font-weight: 100 900;
  src: url("fonts/geist-latin-wght-normal.woff2") format("woff2-variations");
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+2000-206F, U+2074,
    U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}
@font-face {
  font-family: "Geist Variable";
  font-style: normal;
  font-display: swap;
  font-weight: 100 900;
  src: url("fonts/geist-latin-ext-wght-normal.woff2") format("woff2-variations");
  unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304, U+0308, U+0329,
    U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F,
    U+A720-A7FF;
}

:root {
  --ground: #f6f7f4;
  --paper: #ffffff;
  --panel: #ffffff;
  --mint: #e1eee6;
  --ink: #0f1613;
  --ink-2: #414d46;
  --ink-3: #5b6760;
  --tone: #ebeee9;
  --accent: #0b6b4b;
  --accent-deep: #07523a;
  --on-ink: #f2f6f3;
  --on-ink-2: #adbbb2;
  --bright: #62e3b0;
  --wordmark: #1d2a24;
  --font: "Geist Variable", system-ui, -apple-system, "Segoe UI", sans-serif;
  --wrap: 1120px;
  --gutter: clamp(20px, 5vw, 48px);
  --out: cubic-bezier(0.23, 1, 0.32, 1);
  --move: cubic-bezier(0.77, 0, 0.175, 1);
  --radius: 28px;
  color-scheme: light;
}
:root[data-theme="dark"] {
  --ground: #1a1612;
  --paper: #251f19;
  --panel: #362d24;
  --mint: #2a231c;
  --ink: #efe6d6;
  --ink-2: #cdc1ae;
  --ink-3: #a59885;
  --tone: #31291f;
  --accent: #e2b673;
  --accent-deep: #f0cb92;
  --on-ink: #1a1612;
  --on-ink-2: #594d40;
  --bright: #6a3f12;
  --wordmark: #e3d7c3;
  color-scheme: dark;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}
html {
  scroll-behavior: smooth;
  scroll-padding-top: 5rem;
  -webkit-text-size-adjust: 100%;
}
body {
  margin: 0;
  background: var(--ground);
  color: var(--ink);
  font-family: var(--font);
  font-size: 1.0625rem;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
::selection {
  background: var(--accent);
  color: var(--on-ink);
}
a {
  color: inherit;
}
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 6px;
}
.band-ink :focus-visible,
.panel-ink :focus-visible {
  outline-color: var(--bright);
}
h1,
h2,
h3,
p,
ul,
figure,
dl,
dd {
  margin: 0;
}
ul {
  padding: 0;
  list-style: none;
}
button,
input,
select {
  font: inherit;
  color: inherit;
}
code {
  font-family: inherit;
  background: var(--tone);
  padding: 0.05em 0.4em;
  border-radius: 8px;
  font-size: 0.95em;
}

.skip {
  position: absolute;
  left: var(--gutter);
  top: -4rem;
  z-index: 20;
  padding: 0.6rem 1.1rem;
  background: var(--ink);
  color: var(--on-ink);
  border-radius: 999px;
}
.skip:focus {
  top: 0.75rem;
}
.wrap {
  width: 100%;
  max-width: calc(var(--wrap) + 2 * var(--gutter));
  margin-inline: auto;
  padding-inline: var(--gutter);
}
.band-mint {
  background: var(--mint);
}
.band-ink {
  background: var(--ink);
  color: var(--on-ink);
}
.section {
  padding-block: clamp(64px, 9vw, 120px);
}

/* ---- top bar ---- */
.bar {
  position: sticky;
  top: 0;
  z-index: 10;
  background: var(--ground);
}
.bar .wrap {
  display: flex;
  align-items: center;
  gap: 0.5rem 1.25rem;
  min-height: 4.25rem;
}
.wordmark {
  font-weight: 620;
  letter-spacing: -0.02em;
  text-decoration: none;
  margin-right: auto;
}
.bar nav {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  flex-wrap: wrap;
}
.bar nav a {
  padding: 0.55rem 0.9rem;
  border-radius: 999px;
  color: var(--ink-2);
  text-decoration: none;
  transition: color 140ms ease, background-color 140ms ease;
}
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0.7rem 1.4rem;
  border: 0;
  border-radius: 999px;
  background: var(--ink);
  color: var(--on-ink);
  font-weight: 560;
  text-decoration: none;
  cursor: pointer;
  transition: background-color 140ms ease, transform 160ms var(--out);
}
.btn:active {
  transform: scale(0.97);
}
.btn-quiet {
  background: var(--tone);
  color: var(--ink);
}
.toggle {
  display: inline-grid;
  place-items: center;
  width: 44px;
  height: 44px;
  border: 0;
  border-radius: 999px;
  background: var(--tone);
  cursor: pointer;
  transition: transform 160ms var(--out);
}
.toggle:active {
  transform: scale(0.97);
}
.toggle svg {
  width: 20px;
  height: 20px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
}
.toggle .sun {
  display: none;
}
:root[data-theme="dark"] .toggle .sun {
  display: block;
}
:root[data-theme="dark"] .toggle .moon {
  display: none;
}
@media (hover: hover) and (pointer: fine) {
  .bar nav a:hover {
    color: var(--ink);
    background: var(--tone);
  }
  .btn:hover {
    background: var(--accent-deep);
    color: var(--on-ink);
  }
  .btn-quiet:hover {
    background: var(--mint);
    color: var(--ink);
  }
  .links a:hover {
    color: var(--accent-deep);
  }
}
@media (max-width: 620px) {
  .bar nav a:not(.btn) {
    display: none;
  }
}

/* ---- type ---- */
.display {
  font-size: clamp(3rem, 8.4vw, 6rem);
  letter-spacing: -0.045em;
  line-height: 0.98;
  font-weight: 640;
  max-width: 14ch;
}
h2 {
  font-size: clamp(1.9rem, 4.2vw, 3rem);
  letter-spacing: -0.035em;
  line-height: 1.04;
  font-weight: 620;
  max-width: 20ch;
}
h3 {
  font-size: 1.35rem;
  letter-spacing: -0.02em;
  line-height: 1.2;
  font-weight: 600;
}
.lede {
  font-size: clamp(1.1rem, 1.6vw, 1.3rem);
  color: var(--ink-2);
  max-width: 44ch;
  margin-top: 1.5rem;
}
.prose {
  max-width: 66ch;
  color: var(--ink-2);
}
.prose + .prose {
  margin-top: 1rem;
}
.small {
  font-size: 0.9375rem;
  color: var(--ink-3);
}
.head {
  display: grid;
  gap: 1.25rem;
  margin-bottom: clamp(32px, 5vw, 56px);
}

/* ---- hero ---- */
.hero {
  padding-block: clamp(48px, 8vw, 104px) clamp(56px, 8vw, 96px);
}
.hero .actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 2.25rem;
}

/* ---- panels ---- */
.panel {
  background: var(--panel);
  border-radius: var(--radius);
  padding: clamp(24px, 4vw, 44px);
}
.panel-ink {
  background: var(--ink);
  color: var(--on-ink);
}
.panel-ink .small,
.panel-ink .prose {
  color: var(--on-ink-2);
}
.panel-tone {
  background: var(--tone);
}
.grid-2 {
  display: grid;
  gap: 1rem;
  grid-template-columns: 7fr 5fr;
}
.grid-2 > * {
  min-width: 0;
}
@media (max-width: 860px) {
  .grid-2 {
    grid-template-columns: 1fr;
  }
}
.status-line {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 1rem;
  padding-block: 0.9rem;
}
.status-line strong {
  font-size: 1.6rem;
  letter-spacing: -0.03em;
  font-weight: 620;
}
.facts {
  display: grid;
  gap: 1.25rem 2rem;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  margin-top: 1.5rem;
}
.facts dt {
  font-size: 0.9375rem;
  opacity: 0.8;
}
.facts dd {
  font-size: 1.5rem;
  font-weight: 600;
  letter-spacing: -0.03em;
}

/* ---- lab controls ---- */
fieldset {
  border: 0;
  margin: 0;
  padding: 0;
  min-width: 0;
}
legend {
  font-weight: 600;
  margin-bottom: 0.75rem;
  padding: 0;
}
.choice {
  display: block;
  position: relative;
}
.choice input {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}
.choice span {
  display: block;
  min-height: 44px;
  padding: 0.65rem 1.1rem;
  margin-bottom: 0.5rem;
  border-radius: 999px;
  background: var(--tone);
  cursor: pointer;
  transition: background-color 140ms ease, color 140ms ease, transform 160ms var(--out);
}
.choice span:active {
  transform: scale(0.97);
}
.choice input:checked + span {
  background: var(--ink);
  color: var(--on-ink);
}
.choice input:focus-visible + span {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}
@media (hover: hover) and (pointer: fine) {
  .choice span:hover {
    background: var(--mint);
  }
  .choice input:checked + span:hover {
    background: var(--ink);
  }
}
.result strong {
  display: block;
  font-size: clamp(1.8rem, 3.6vw, 2.6rem);
  letter-spacing: -0.04em;
  font-weight: 640;
  line-height: 1.05;
  margin-block: 0.25rem 1rem;
}
.result p + p {
  margin-top: 0.75rem;
}

/* ---- chart and table ---- */
.chart {
  width: 100%;
  height: auto;
  display: block;
}
.chart text {
  fill: var(--ink-3);
  font-family: var(--font);
  font-size: 15px;
}
.chart .grid-line {
  stroke: var(--tone);
  stroke-width: 1;
}
.chart .bar-real {
  fill: var(--accent);
}
.chart .bar-model {
  fill: var(--ink-3);
  opacity: 0.55;
}
.chart .label-strong {
  fill: var(--ink);
  font-weight: 600;
}
.legend {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.5rem;
  margin-top: 1rem;
  color: var(--ink-2);
  font-size: 0.9375rem;
}
.legend i {
  display: inline-block;
  width: 0.9rem;
  height: 0.9rem;
  border-radius: 4px;
  margin-right: 0.5rem;
  vertical-align: -0.1em;
}
.table-wrap {
  overflow-x: auto;
  margin-top: 2rem;
}
table {
  width: 100%;
  border-collapse: collapse;
  font-variant-numeric: tabular-nums;
}
th,
td {
  text-align: right;
  padding: 0.7rem 1rem;
  white-space: nowrap;
}
th:first-child,
td:first-child {
  text-align: left;
}
thead th {
  color: var(--ink-3);
  font-weight: 500;
  font-size: 0.9375rem;
}
tbody tr:nth-child(odd) {
  background: var(--tone);
}
tbody tr:nth-child(odd) td:first-child {
  border-radius: 14px 0 0 14px;
}
tbody tr:nth-child(odd) td:last-child {
  border-radius: 0 14px 14px 0;
}
caption {
  text-align: left;
  color: var(--ink-3);
  font-size: 0.9375rem;
  caption-side: bottom;
  padding-block: 0.75rem;
}

/* ---- limits ---- */
.limits {
  display: grid;
  gap: 1.5rem 2.5rem;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}
.limits li {
  color: var(--ink-2);
}
.limits strong {
  display: block;
  color: var(--ink);
  font-weight: 600;
  margin-bottom: 0.25rem;
}
.band-ink .prose,
.band-ink .limits li {
  color: var(--on-ink-2);
}
.band-ink .limits strong {
  color: var(--on-ink);
}
.links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.5rem;
  margin-top: 1.75rem;
}
.links a {
  color: var(--accent);
  font-weight: 560;
  text-underline-offset: 0.2em;
  transition: color 140ms ease;
}
pre {
  margin: 1.25rem 0 0;
  padding: 1.1rem 1.3rem;
  background: var(--tone);
  border-radius: 20px;
  overflow-x: auto;
  font-family: inherit;
  font-size: 0.95rem;
  line-height: 1.5;
}

/* ---- lab controls ---- */
.controls-grid {
  display: grid;
  gap: 1.25rem 1.5rem;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  align-items: end;
}
.field {
  display: grid;
  gap: 0.5rem;
}
.field > span {
  font-weight: 600;
}
.field select,
.field input[type="number"] {
  min-height: 44px;
  padding: 0.5rem 1rem;
  border: 0;
  border-radius: 999px;
  background: var(--tone);
  width: 100%;
}
.btn:disabled {
  opacity: 0.6;
  cursor: progress;
}
.progress {
  height: 6px;
  border-radius: 999px;
  background: var(--tone);
  overflow: hidden;
  margin-top: 1.25rem;
}
.progress i {
  display: block;
  height: 100%;
  width: 0;
  background: var(--accent);
  border-radius: 999px;
  transition: width 160ms ease;
}
.readout {
  font-size: clamp(1.3rem, 2.6vw, 1.9rem);
  letter-spacing: -0.03em;
  line-height: 1.2;
  font-weight: 600;
  max-width: 30ch;
  margin-top: 1.5rem;
}
.verdicts {
  display: grid;
  gap: 1.25rem 2rem;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}
.verdicts li strong {
  display: block;
  font-weight: 620;
  margin-bottom: 0.25rem;
}
.verdicts li span {
  color: var(--ink-2);
}
.chart .ref-line {
  stroke: var(--ink-3);
  stroke-width: 2;
  stroke-dasharray: 4 6;
  fill: none;
}
.chart .range-real {
  stroke: var(--accent);
  stroke-width: 3;
  stroke-linecap: round;
}
.chart .range-oos {
  stroke: var(--ink-3);
  stroke-width: 3;
  stroke-linecap: round;
  opacity: 0.7;
}
.chart .dot-real {
  fill: var(--accent);
}
.chart .dot-oos {
  fill: var(--ink-3);
}
.chart .zero-line {
  stroke: var(--ink-3);
  stroke-width: 1.5;
  opacity: 0.6;
}
details summary {
  min-height: 44px;
  display: flex;
  align-items: center;
  cursor: pointer;
  font-weight: 600;
  color: var(--accent);
}
.stat-row {
  display: grid;
  gap: 1rem 2rem;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  margin-top: 1.5rem;
}
.stat-row dt {
  font-size: 0.9375rem;
  color: var(--ink-3);
}
.stat-row dd {
  font-size: 1.6rem;
  font-weight: 600;
  letter-spacing: -0.03em;
  font-variant-numeric: tabular-nums;
}
.panel-ink .stat-row dt {
  color: var(--on-ink-2);
}

/* ---- footer ---- */
.foot {
  padding-block: clamp(48px, 7vw, 88px) 32px;
  overflow: hidden;
}
.foot-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.5rem;
  color: var(--on-ink-2);
}
.foot-links a {
  text-underline-offset: 0.2em;
}
.foot-name {
  display: block;
  margin-top: clamp(32px, 6vw, 72px);
  font-size: clamp(2.6rem, 11.5vw, 9rem);
  font-weight: 650;
  letter-spacing: -0.05em;
  line-height: 0.9;
  white-space: nowrap;
  color: var(--on-ink);
  opacity: 0.16;
}

/* ---- entrances (play once; content stays visible without JavaScript) ---- */
.js .rise {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 650ms var(--out), transform 650ms var(--out);
  transition-delay: calc(var(--i, 0) * 70ms);
}
.js .rise.in {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  .js .rise {
    transform: none;
    transition: opacity 300ms ease;
    transition-delay: 0ms;
  }
  .btn:active,
  .toggle:active,
  .choice span:active {
    transform: none;
  }
}