/* Champoria. Design system "Chalk and pressure". See DESIGN.md */
:root {
  --bg: #E7EAE4;
  --bg2: #DCE1D9;
  --surface: #F1F3EE;
  --ink: #0E1915;
  --ink2: #4A5952;
  --ink3: #59665F;
  --line: rgba(14, 25, 21, .16);
  --line2: rgba(14, 25, 21, .08);
  --accent: #C8391F;
  --accent-ink: #A92E17;
  --on-accent: #FBFCFA;
  --glass: #2C5446;
  --glass2: #7FA192;
  --bubble: rgba(14, 25, 21, .55);
  --display: "Unbounded", "Hiragino Sans", "Noto Sans JP", "Yu Gothic", system-ui, sans-serif;
  --sans: "Onest", "Hiragino Sans", "Noto Sans JP", "Yu Gothic", system-ui, sans-serif;
  --mono: "JetBrains Mono", ui-monospace, "SFMono-Regular", Menlo, monospace;
  --gut: clamp(16px, 4vw, 48px);
  --maxw: 1320px;
  --hd: 64px;
  --ease: cubic-bezier(.16, 1, .3, 1);
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0C1512;
    --bg2: #101C18;
    --surface: #15221D;
    --ink: #E4E9E2;
    --ink2: #A3B1A9;
    --ink3: #7D8C84;
    --line: rgba(228, 233, 226, .16);
    --line2: rgba(228, 233, 226, .08);
    --accent: #FF6B4A;
    --accent-ink: #FF8466;
    --on-accent: #0C1512;
    --glass: #8DB7A5;
    --glass2: #4F7B6A;
    --bubble: rgba(228, 233, 226, .6);
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #0C1512; --bg2: #101C18; --surface: #15221D; --ink: #E4E9E2; --ink2: #A3B1A9; --ink3: #7D8C84;
  --line: rgba(228, 233, 226, .16); --line2: rgba(228, 233, 226, .08); --accent: #FF6B4A; --accent-ink: #FF8466;
  --on-accent: #0C1512; --glass: #8DB7A5; --glass2: #4F7B6A; --bubble: rgba(228, 233, 226, .6); color-scheme: dark;
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; scroll-padding-top: var(--hd); }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
body {
  margin: 0; background: var(--bg); color: var(--ink);
  font: 400 17px/1.6 var(--sans); font-feature-settings: "ss01";
  -webkit-font-smoothing: antialiased; text-rendering: optimizeLegibility;
  overflow-x: clip;
}
.l-ja { line-height: 1.8; }
img, svg, canvas { display: block; max-width: 100%; }
a { color: inherit; }
h1, h2, h3, p, ol, ul { margin: 0; }
ol, ul { padding: 0; list-style: none; }
.sr { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.skip { position: fixed; left: 12px; top: -60px; z-index: 100; background: var(--ink); color: var(--bg); padding: 10px 14px; text-decoration: none; }
.skip:focus { top: 12px; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }
.ic { width: 1.15em; height: 1.15em; flex: none; }

/* film grain on a fixed layer only */
body::after {
  content: ""; position: fixed; inset: 0; z-index: 90; pointer-events: none; opacity: .05;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='2' stitchTiles='stitch'/%3E%3CfeColorMatrix values='0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 .9 0'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

.wrap { width: 100%; max-width: var(--maxw); margin-inline: auto; padding-inline: var(--gut); }

/* ---------- type ---------- */
.h2 {
  font: 350 clamp(1.9rem, 4.2vw, 3.6rem)/1.08 var(--display);
  letter-spacing: -.035em; text-wrap: balance; max-width: 18ch;
}
.l-ja .h2 { font-weight: 500; letter-spacing: 0; line-height: 1.3; }
.h2-xl { font-size: clamp(2.4rem, 6.4vw, 5.8rem); max-width: 14ch; }
.lead { font-size: clamp(1.05rem, 1.35vw, 1.22rem); line-height: 1.6; color: var(--ink2); max-width: 54ch; margin-top: 22px; text-wrap: pretty; }
.note { font: 400 13px/1.55 var(--mono); color: var(--ink3); margin-top: 18px; max-width: 64ch; }
.fn { font: 500 .62em/1 var(--mono); vertical-align: super; margin-left: 2px; }
.fn a { text-decoration: none; color: var(--accent-ink); padding: 2px; }
.fn a:hover { text-decoration: underline; }
.step-n, .mnum { font: 500 12px/1 var(--mono); color: var(--ink3); letter-spacing: .04em; }

/* ---------- buttons ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 12px; white-space: nowrap;
  font: 500 15px/1 var(--sans); text-decoration: none;
  background: var(--accent); color: var(--on-accent); padding: 17px 22px 17px 24px;
  transition: transform .5s var(--ease), background-color .3s;
}
.btn:hover { background: var(--accent-ink); }
.btn:hover .ic { transform: translateY(2px); }
.btn .ic { transition: transform .5s var(--ease); }
.btn:active { transform: translateY(1px) scale(.99); }

/* ---------- header ---------- */
.hd {
  position: fixed; inset: 0 0 auto; z-index: 50; height: var(--hd);
  display: flex; align-items: center; gap: 28px; padding-inline: var(--gut);
  transition: background-color .4s, border-color .4s; border-bottom: 1px solid transparent;
}
.hd.solid { background: color-mix(in srgb, var(--bg) 86%, transparent); backdrop-filter: blur(14px) saturate(140%); -webkit-backdrop-filter: blur(14px) saturate(140%); border-color: var(--line2); }
.logo { display: inline-flex; align-items: center; gap: 10px; text-decoration: none; flex: none; }
.logo-word { font: 450 18px/1 var(--display); letter-spacing: -.04em; }
.logo-mark { position: relative; width: 18px; height: 22px; }
.logo-mark i { position: absolute; border: 1.5px solid currentColor; border-radius: 50%; }
.logo-mark i:nth-child(1) { width: 6px; height: 6px; left: 2px; bottom: 0; }
.logo-mark i:nth-child(2) { width: 8px; height: 8px; left: 8px; bottom: 6px; }
.logo-mark i:nth-child(3) { width: 11px; height: 11px; left: 1px; top: 0; border-color: var(--accent); }
.nav { margin-left: auto; }
.nav-list { display: flex; gap: clamp(14px, 1.6vw, 26px); }
.nav-list a { font: 450 14px/1 var(--sans); text-decoration: none; color: var(--ink2); padding: 8px 0; position: relative; white-space: nowrap; }
.nav-list a::after { content: ""; position: absolute; left: 0; right: 0; bottom: 2px; height: 1px; background: currentColor; transform: scaleX(0); transform-origin: left; transition: transform .45s var(--ease); }
.nav-list a:hover, .nav-list a.on { color: var(--ink); }
.nav-list a:hover::after, .nav-list a.on::after { transform: scaleX(1); }
.hd-tools { display: flex; align-items: center; gap: 8px; }
.lang { position: relative; }
.lang-btn, .menu-btn {
  display: inline-flex; align-items: center; gap: 8px; height: 40px; padding: 0 12px;
  background: none; border: 1px solid var(--line); color: var(--ink); font: 500 13px/1 var(--mono); cursor: pointer;
}
.lang-btn:hover, .menu-btn:hover { border-color: var(--ink); }
.lang-list {
  position: absolute; right: 0; top: calc(100% + 8px); min-width: 210px; background: var(--surface);
  border: 1px solid var(--line); padding: 6px; box-shadow: 0 18px 40px -18px rgba(14, 25, 21, .35);
}
.lang-list a { display: flex; gap: 14px; align-items: center; padding: 10px 12px; text-decoration: none; font-size: 15px; }
.lang-list a:hover { background: var(--bg2); }
.lang-list a[aria-current] { color: var(--accent-ink); }
.lang-list .lc { font: 500 12px/1 var(--mono); color: var(--ink3); width: 22px; }
.menu-btn { display: none; }
.menu-lines { position: relative; width: 16px; height: 8px; }
.menu-lines i { position: absolute; left: 0; right: 0; height: 1.5px; background: currentColor; transition: transform .4s var(--ease); }
.menu-lines i:first-child { top: 0; }
.menu-lines i:last-child { bottom: 0; }
.menu-open .menu-lines i:first-child { transform: translateY(3.25px) rotate(45deg); }
.menu-open .menu-lines i:last-child { transform: translateY(-3.25px) rotate(-45deg); }
@media (max-width: 1179px) {
  .menu-btn { display: inline-flex; }
  .hd-tools { margin-left: auto; }
  .nav {
    position: fixed; inset: var(--hd) 0 0; background: var(--bg); margin: 0;
    padding: 24px var(--gut) 40px; overflow-y: auto; visibility: hidden; opacity: 0;
    transition: opacity .35s var(--ease), visibility 0s .35s;
  }
  .menu-open .nav { visibility: visible; opacity: 1; transition: opacity .35s var(--ease); }
  .nav-list { flex-direction: column; gap: 0; }
  .nav-list li { border-bottom: 1px solid var(--line2); }
  .nav-list a { display: block; font: 350 clamp(1.6rem, 6vw, 2.4rem)/1.1 var(--display); letter-spacing: -.03em; color: var(--ink); padding: 18px 0; }
  .nav-list a::after { display: none; }
  .menu-open .hd { background: var(--bg); }
}
@media (max-width: 420px) { .menu-label { display: none; } }

/* ---------- hero ---------- */
.hero { position: relative; min-height: 100dvh; display: grid; align-items: end; overflow: hidden; }
.hero-cv { position: absolute; inset: 0; width: 100%; height: 100%; }
.hero-in {
  position: relative; width: 100%; max-width: var(--maxw); margin-inline: auto;
  padding: calc(var(--hd) + 40px) var(--gut) clamp(40px, 9vh, 96px);
}
.hero-h1 {
  font: 300 clamp(3rem, 9.4vw, 9.2rem)/.98 var(--display); letter-spacing: -.055em;
  max-width: 11ch; text-wrap: balance;
}
.l-ru .hero-h1, .l-de .hero-h1, .l-fr .hero-h1, .l-it .hero-h1, .l-es .hero-h1 { font-size: clamp(2.6rem, 8vw, 8rem); max-width: 12ch; }
.l-ja .hero-h1 { font-weight: 500; letter-spacing: -.02em; line-height: 1.15; font-size: clamp(2.6rem, 7vw, 6.6rem); }
.hero-in::before { content: ""; position: absolute; inset: -12vh 0 0; z-index: -1; pointer-events: none;
  background: radial-gradient(120% 90% at 0% 100%, var(--bg) 35%, color-mix(in srgb, var(--bg) 0%, transparent) 72%); }
.hero-in { z-index: 1; isolation: isolate; }
.hero-sub { margin-top: 28px; max-width: 40ch; font-size: clamp(1.05rem, 1.4vw, 1.25rem); color: var(--ink2); }
.hero .btn { margin-top: 34px; }

/* ---------- pinned scenes ---------- */
.scene { position: relative; }
.pin-wrap { height: var(--len, 300vh); position: relative; }
.pin-stage { position: sticky; top: 0; height: 100dvh; overflow: hidden; display: flex; align-items: center; }
.no-pin .pin-wrap { height: auto; }
.no-pin .pin-stage { position: relative; height: auto; padding-block: 96px; }

/* bubble */
.bubble-grid {
  width: 100%; max-width: var(--maxw); margin-inline: auto; padding: var(--hd) var(--gut) 0;
  display: grid; grid-template-columns: minmax(0, 5fr) minmax(0, 7fr); gap: clamp(24px, 5vw, 80px); align-items: center; height: 100%;
}
.steps { margin-top: 36px; display: grid; gap: 0; border-top: 1px solid var(--line); }
.step { padding: 20px 0 22px; border-bottom: 1px solid var(--line); opacity: .38; transition: opacity .5s var(--ease); }
.step.on { opacity: 1; }
.step p { display: none; }
.step.on p, .no-pin .step p { display: block; }
.no-pin .step { opacity: 1; }
.step h3 { font: 400 1.3rem/1.2 var(--display); letter-spacing: -.02em; margin: 10px 0 8px; }
.step p { color: var(--ink2); max-width: 46ch; font-size: 16px; }
.scale-note { margin-top: 18px; font: 400 12px/1.5 var(--mono); color: var(--ink3); max-width: 46ch; }
.bubble-vis { height: min(78dvh, 760px); position: relative; }
.bubble-vis canvas { width: 100%; height: 100%; }
.bubble-fact {
  max-width: var(--maxw); margin-inline: auto; padding: clamp(80px, 14vh, 160px) var(--gut);
  display: grid; grid-template-columns: minmax(0, 1fr); gap: 28px; justify-items: start;
}
.fact-num { font: 250 clamp(2.6rem, 10.5vw, 10.5rem)/.9 var(--display); max-width: 100%; white-space: nowrap; letter-spacing: -.06em; font-variant-numeric: tabular-nums; color: var(--ink); }
.fact-txt { font-size: clamp(1.05rem, 1.4vw, 1.25rem); color: var(--ink2); max-width: 40ch; margin-left: clamp(0px, 34vw, 520px); }

/* pressure */
.scene-pressure { background: var(--bg2); }
.pressure-grid {
  width: 100%; max-width: var(--maxw); margin-inline: auto; padding: var(--hd) var(--gut) 0;
  display: grid; grid-template-columns: minmax(0, 7fr) minmax(0, 5fr); gap: clamp(24px, 5vw, 80px); align-items: center;
}
.gauge-wrap { position: relative; }
.gauge { width: 100%; max-height: 74dvh; overflow: visible; }
.g-face { fill: var(--surface); stroke: var(--line); }
.tk { stroke: var(--ink3); stroke-width: 1; }
.tk-major { stroke: var(--ink); stroke-width: 2; }
.tk-l { font: 500 15px var(--mono); fill: var(--ink2); text-anchor: middle; dominant-baseline: middle; }
.gauge-read small { font: 500 14px/1 var(--mono); letter-spacing: .08em; color: var(--ink3); }
.g-unit { display: none; font: 500 13px var(--mono); fill: var(--ink3); text-anchor: middle; letter-spacing: .08em; }
.band { fill: none; stroke-width: 6; stroke-linecap: butt; }
.band-semi { stroke: var(--glass2); }
.band-spark { stroke: var(--glass); opacity: .55; }
.band-quality { stroke: var(--glass); }
.mark6 { fill: var(--accent); }
.needle line { stroke: var(--accent); stroke-width: 3; stroke-linecap: square; }
.needle { transform: rotate(-120deg); }
.hub { fill: var(--ink); }
.gauge-read {
  position: absolute; left: 50%; top: 62%; transform: translateX(-50%); display: flex; align-items: baseline; gap: .12em;
  font: 250 clamp(3.2rem, 6.6vw, 6.6rem)/1 var(--display); letter-spacing: -.06em; font-variant-numeric: tabular-nums; color: var(--ink);
}
.pbands { margin-top: 30px; border-top: 1px solid var(--line); }
.pb { display: flex; justify-content: space-between; gap: 16px; padding: 14px 0; border-bottom: 1px solid var(--line2); opacity: .4; transition: opacity .5s var(--ease); }
.pb.on { opacity: 1; }
.pb-k { font-weight: 500; }
.pb-v { font: 400 14px/1.6 var(--mono); color: var(--ink2); white-space: nowrap; }
.pb-champ .pb-k { color: var(--accent-ink); }

/* methods: horizontal pan */
.hpan { position: relative; }
.hpan-stage { position: sticky; top: 0; height: 100dvh; overflow: hidden; display: flex; align-items: center; }
.hpan-track { display: flex; gap: clamp(16px, 2vw, 28px); padding: var(--hd) var(--gut) 0; will-change: transform; align-items: stretch; }
.mintro { flex: 0 0 min(460px, 80vw); display: flex; flex-direction: column; justify-content: center; padding-right: clamp(0px, 3vw, 48px); }
.hint { display: inline-flex; gap: 10px; align-items: center; margin-top: 30px; font: 400 13px/1 var(--mono); color: var(--ink3); }
.mcard {
  flex: 0 0 clamp(300px, 30vw, 420px); background: var(--surface); border: 1px solid var(--line2);
  padding: 26px 26px 30px; display: flex; flex-direction: column; min-height: min(74dvh, 640px);
}
.mvis { aspect-ratio: 6 / 5; background: var(--bg); margin: -6px -6px 24px; display: grid; place-items: center; overflow: hidden; }
.msvg { width: 86%; height: auto; }
.mcard h3 { font: 400 1.45rem/1.15 var(--display); letter-spacing: -.025em; margin: 10px 0 12px; }
.mcard p { font-size: 15.5px; color: var(--ink2); }
.mcard .mex { margin-top: auto; padding-top: 22px; font: 400 13px/1.5 var(--mono); color: var(--ink); }
.no-pin .hpan-stage { position: relative; height: auto; overflow-x: auto; scroll-snap-type: x mandatory; padding-bottom: 40px; }
.no-pin .mcard, .no-pin .mintro { scroll-snap-align: start; }
.no-pin .hpan-stage { scroll-padding-inline: var(--gut); }

/* method drawings */
.msvg .bottle, .msvg .tank, .msvg .cyl { fill: none; stroke: var(--ink); stroke-width: 2; }
.msvg .cap, .msvg .lid { fill: var(--ink); }
.msvg .wine { fill: var(--glass); opacity: .22; }
.msvg .wine.cloudy { opacity: .34; }
.msvg .yeast circle { fill: var(--ink2); }
.msvg .sugar rect { fill: none; stroke: var(--ink2); stroke-width: 1.2; }
.msvg .rise circle { fill: none; stroke: var(--ink); stroke-width: 1.2; }
.msvg .flow { fill: none; stroke: var(--accent); stroke-width: 2; stroke-dasharray: 4 6; }
.msvg .gaugeline { stroke: var(--ink); stroke-width: 2; }
.msvg .mini-gauge { fill: none; stroke: var(--accent); stroke-width: 2; }
@media (prefers-reduced-motion: no-preference) {
  .msvg .rise circle { animation: rise 3.2s var(--ease) infinite; transform-box: fill-box; }
  .msvg .rise circle:nth-child(2) { animation-delay: .8s; }
  .msvg .rise circle:nth-child(3) { animation-delay: 1.6s; }
  .msvg .rise circle:nth-child(4) { animation-delay: 2.4s; }
  .msvg .rise circle:nth-child(5) { animation-delay: 1.2s; }
  .msvg .rise circle:nth-child(6) { animation-delay: 2s; }
  .msvg .flow { animation: flow 1.6s linear infinite; }
  .msvg .sugar rect { animation: melt 4s ease-in-out infinite; transform-box: fill-box; transform-origin: center; }
  .msvg .sugar rect:nth-child(2) { animation-delay: 1s; }
  .msvg .sugar rect:nth-child(3) { animation-delay: 2s; }
  .msvg .sugar rect:nth-child(4) { animation-delay: 3s; }
  .msvg .fill-late { animation: fillin 4s var(--ease) infinite; transform-box: fill-box; transform-origin: bottom; }
}
@keyframes rise { 0% { transform: translateY(0) scale(.6); opacity: 0; } 15% { opacity: 1; } 100% { transform: translateY(-70px) scale(1.5); opacity: 0; } }
@keyframes flow { to { stroke-dashoffset: -20; } }
@keyframes melt { 0%, 100% { transform: scale(1); opacity: 1; } 60% { transform: scale(.2); opacity: 0; } }
@keyframes fillin { 0% { transform: scaleY(0); } 60%, 100% { transform: scaleY(1); } }

/* cellar */
.scene-cellar { background: var(--bg); }
.cellar-grid {
  width: 100%; max-width: var(--maxw); margin-inline: auto; padding: calc(var(--hd) + 16px) var(--gut) 24px; height: 100%;
  display: grid; grid-template-columns: minmax(0, 4fr) minmax(0, 8fr); grid-template-rows: auto 1fr; gap: 12px clamp(24px, 4vw, 64px);
}
.cellar-head { grid-column: 1; grid-row: 1; }
.months { margin-top: 18px; font: 250 clamp(3rem, 6.5vw, 6rem)/1 var(--display); letter-spacing: -.05em; font-variant-numeric: tabular-nums; }
.months small { font: 400 14px/1 var(--mono); letter-spacing: 0; color: var(--ink3); }
.cellar-vis { grid-column: 2; grid-row: 1 / span 2; min-height: 0; }
.cellar-vis canvas { width: 100%; height: 100%; }
.csteps { grid-column: 1; grid-row: 2; align-self: end; position: relative; min-height: 220px; }
.cstep { position: absolute; inset: auto 0 0 0; opacity: 0; transform: translateY(16px); transition: opacity .5s var(--ease), transform .7s var(--ease); }
.cstep.on { opacity: 1; transform: none; }
.cstep h3 { font: 400 1.5rem/1.2 var(--display); letter-spacing: -.02em; margin: 10px 0 10px; }
.cstep p { color: var(--ink2); max-width: 40ch; }
.no-pin .csteps { min-height: 0; display: grid; gap: 22px; }
.no-pin .cstep { position: static; opacity: 1; transform: none; }

/* dosage */
.scene-dosage { background: var(--bg2); padding-block: clamp(96px, 16vh, 180px); }
.dosage-grid {
  display: grid; grid-template-columns: minmax(0, 5fr) minmax(0, 3fr) minmax(0, 4fr);
  grid-template-areas: "text glass read" "scale scale scale"; gap: 48px clamp(24px, 4vw, 56px); align-items: end;
}
.dosage-text { grid-area: text; }
.dosage-glass { grid-area: glass; height: clamp(240px, 34vw, 400px); }
.dosage-glass canvas { width: 100%; height: 100%; }
.dosage-read { grid-area: read; }
.dr-term { font: 350 clamp(2rem, 4vw, 3.4rem)/1.05 var(--display); letter-spacing: -.04em; color: var(--accent-ink); }
.dr-gl { margin-top: 14px; font: 500 22px/1.2 var(--mono); }
.dr-glass { margin-top: 6px; font: 400 17px/1.3 var(--mono); color: var(--ink2); }
.dr-glass small { font-size: 13px; color: var(--ink3); }
.dr-note { margin-top: 14px; min-height: 3.2em; font-size: 14px; color: var(--ink2); max-width: 36ch; }
.dscale { grid-area: scale; position: relative; padding-top: 8px; }
.dterms { position: relative; height: 172px; }
.dterm {
  position: absolute; left: calc(var(--lo) * 100%); width: calc((var(--hi) - var(--lo)) * 100%);
  border-left: 1px solid var(--line); padding: 0 8px; display: flex; flex-direction: column; gap: 4px; justify-content: flex-end;
  transition: color .3s; color: var(--ink3); cursor: pointer;
}
.dterm:nth-child(1) { bottom: 112px; } .dterm:nth-child(2) { bottom: 56px; } .dterm:nth-child(3) { bottom: 0; }
.dterm:nth-child(n+4) { bottom: 0; }
.dterm.on { color: var(--ink); border-color: var(--accent); }
.dt-name { font: 450 15px/1.2 var(--sans); white-space: nowrap; }
.dt-r { font: 400 12px/1.3 var(--mono); white-space: nowrap; }
.dtrack { position: relative; height: 10px; margin-top: 12px; background: repeating-linear-gradient(90deg, var(--line) 0 1px, transparent 1px calc(100% / 60)); border-block: 1px solid var(--line); }
.dfill { position: absolute; inset: 0 auto 0 0; width: 13%; background: var(--accent); }
.dticks { position: relative; height: 24px; margin-top: 8px; font: 400 12px/1 var(--mono); color: var(--ink3); }
.dticks span { position: absolute; left: calc(var(--x) * 100%); transform: translateX(-50%); }
#d-range { position: absolute; left: 0; right: 0; bottom: 30px; width: 100%; height: 44px; margin: 0; opacity: 0; cursor: ew-resize; }
#d-range:focus-visible + * { outline: none; }
.dscale:focus-within .dtrack { outline: 2px solid var(--accent); outline-offset: 4px; }

/* world */
.scene-world { padding-block: clamp(96px, 16vh, 180px) clamp(64px, 10vh, 120px); }
.world-maps { position: relative; max-width: 1600px; margin: 48px auto 0; padding-inline: var(--gut); }
.map { width: 100%; height: auto; overflow: visible; }
.map-eu, .map-world .map { overflow: hidden; }
.map-world { overflow: hidden; }
.pin-l { font: 500 13px var(--sans); fill: var(--ink); paint-order: stroke; stroke: var(--bg); stroke-width: 3px; }
.map-eu .pin-l { font-size: 1.25px; stroke-width: .3px; stroke: var(--surface); }
.pin.hot .pin-l { fill: var(--accent-ink); }
.land { fill: var(--bg2); stroke: var(--line); stroke-width: .6; }
.map-eu .land { stroke-width: .15; }
.europe-box { fill: none; stroke: var(--ink3); stroke-width: .8; stroke-dasharray: 3 3; }
.pin-dot { fill: var(--ink); }
.pin-halo { fill: var(--glass); opacity: .22; }
.pin-tank .pin-dot { fill: var(--accent); }
.pin-mixed .pin-dot { fill: var(--glass); }
.pin.hot .pin-halo { opacity: .55; }
@media (prefers-reduced-motion: no-preference) {
  .reveal-ready .map-world .pin { opacity: 0; transition: opacity .6s var(--ease); transition-delay: calc(var(--i) * 45ms); }
  .reveal-ready .world-maps.in .map-world .pin { opacity: 1; }
  .pin-halo { animation: halo 3.6s ease-in-out infinite; transform-box: fill-box; transform-origin: center; }
}
@keyframes halo { 0%, 100% { transform: scale(1); } 50% { transform: scale(1.5); } }
.map-inset { position: absolute; left: var(--gut); bottom: 2%; width: min(25%, 380px); background: var(--surface); border: 1px solid var(--line); padding: 6px; box-shadow: 0 30px 60px -30px rgba(14, 25, 21, .4); }
.world-list { margin-top: 72px; display: grid; grid-template-columns: minmax(0, 3fr) minmax(0, 9fr); gap: 32px; }
.legend { display: grid; gap: 10px; align-content: start; font-size: 14px; color: var(--ink2); }
.lg, .rg { display: flex; align-items: center; gap: 10px; }
.rg-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--ink); flex: none; }
.lg-tank .rg-dot, .rg-tank .rg-dot { background: var(--accent); }
.lg-mixed .rg-dot, .rg-mixed .rg-dot { background: var(--glass); }
.regions { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 0 28px; border-top: 1px solid var(--line); }
.rg { padding: 13px 0; border-bottom: 1px solid var(--line2); cursor: default; }
.rg-n { font-weight: 450; }
.rg-c { margin-left: auto; font: 400 12px/1 var(--mono); color: var(--ink3); }
.rg.hot .rg-n { color: var(--accent-ink); }

/* champagne chalk */
.chalk { position: relative; min-height: 110dvh; display: flex; align-items: flex-start; overflow: hidden; }
.chalk canvas { position: absolute; inset: 0; width: 100%; height: 100%; }
.chalk-text { position: relative; padding-top: clamp(110px, 18vh, 200px); }
.chalk-text .lead { color: var(--ink); max-width: 46ch; }
.stats { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); margin-top: clamp(48px, 8vh, 96px); border-top: 1px solid var(--ink); }
.st { padding: 30px 24px 34px 0; border-bottom: 1px solid var(--line); display: grid; gap: 10px; align-content: start; }
.st:not(:nth-child(3n + 1)) { padding-left: 24px; border-left: 1px solid var(--line); }
.st-n { font: 250 clamp(2.6rem, 5.4vw, 5rem)/1 var(--display); letter-spacing: -.055em; font-variant-numeric: tabular-nums; }
.st-l { color: var(--ink2); max-width: 26ch; font-size: 15.5px; }
.st-ha .st-n { color: var(--accent-ink); }
.scene-champ .note { margin-bottom: 24px; }

/* history */
.scene-hist { padding-block: clamp(96px, 16vh, 180px); }
.hist { margin-top: 56px; display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 0; }
.hy { padding: 28px 24px 0 0; border-top: 1px solid var(--ink); position: relative; }
.hy::before { content: ""; position: absolute; top: -5px; left: 0; width: 9px; height: 9px; border-radius: 50%; background: var(--bg); border: 1.5px solid var(--ink); }
.hy:last-child::before { border-color: var(--accent); background: var(--accent); }
.hy-y { display: block; font: 300 clamp(2rem, 3.6vw, 3.2rem)/1 var(--display); letter-spacing: -.05em; margin-bottom: 16px; }
.hy p { color: var(--ink2); font-size: 15.5px; max-width: 30ch; }

/* library */
.scene-lib { background: var(--ink); color: var(--bg); padding-block: clamp(96px, 16vh, 180px); }
.scene-lib .lead { color: color-mix(in srgb, var(--bg) 72%, transparent); }
.lib-head .h2 { font-size: clamp(1.9rem, 3.3vw, 3.1rem); }
.lib-grid { display: grid; grid-template-columns: minmax(0, 4fr) minmax(0, 8fr); gap: clamp(32px, 5vw, 80px); }
.lib { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); border-top: 1px solid color-mix(in srgb, var(--bg) 30%, transparent); }
.lb { padding: 24px 20px 26px 0; border-bottom: 1px solid color-mix(in srgb, var(--bg) 16%, transparent); display: grid; gap: 6px; }
.lb:nth-child(even) { padding-left: 20px; border-left: 1px solid color-mix(in srgb, var(--bg) 16%, transparent); }
.lb-n { font: 400 1.35rem/1.2 var(--display); letter-spacing: -.025em; }
.lb-d { color: color-mix(in srgb, var(--bg) 70%, transparent); font-size: 15px; }
.lb-s { font: 400 11.5px/1 var(--mono); letter-spacing: .06em; text-transform: uppercase; color: var(--accent); margin-top: 6px; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .scene-lib { background: var(--surface); color: var(--ink); }
  :root:not([data-theme="light"]) .scene-lib .lead, :root:not([data-theme="light"]) .lb-d { color: var(--ink2); }
  :root:not([data-theme="light"]) .lib, :root:not([data-theme="light"]) .lb { border-color: var(--line); }
}

/* footer */
.ft { padding-block: 72px 48px; border-top: 1px solid var(--line); }
.ft-grid { display: grid; grid-template-columns: minmax(0, 8fr) minmax(0, 4fr); gap: 48px; }
.ft-h { font: 400 1.2rem/1 var(--display); letter-spacing: -.02em; }
.sources { margin-top: 22px; counter-reset: s; display: grid; gap: 10px; }
.sources li { counter-increment: s; display: grid; grid-template-columns: 30px 1fr; font-size: 14px; color: var(--ink2); }
.sources li::before { content: counter(s); font: 500 12px/1.9 var(--mono); color: var(--accent-ink); }
.sources li:target { background: var(--bg2); }
.sources a { text-decoration: none; }
.sources a:hover { text-decoration: underline; color: var(--ink); }
.ft-side p { margin-top: 18px; color: var(--ink2); font-size: 14.5px; max-width: 40ch; }
.ft-langs { display: flex; flex-wrap: wrap; gap: 6px 16px; margin-top: 22px; font-size: 14px; }
.ft-langs a { text-decoration: none; color: var(--ink2); }
.ft-langs a[aria-current] { color: var(--ink); text-decoration: underline; text-underline-offset: 4px; }
.ft-meta { font: 400 12.5px/1.6 var(--mono) !important; color: var(--ink3) !important; }

/* 404 */
.nf-main { position: relative; min-height: 100dvh; display: grid; place-items: center; overflow: hidden; }
.nf-in { position: relative; padding: var(--gut); max-width: 640px; }
.nf-code { font: 250 clamp(5rem, 18vw, 14rem)/.9 var(--display); letter-spacing: -.06em; }
.nf-in p { margin-top: 16px; color: var(--ink2); }
.nf-in .btn { margin-top: 28px; }

/* reveal */
@media (prefers-reduced-motion: no-preference) {
  .reveal-ready .reveal { opacity: 0; transform: translateY(28px); transition: opacity .9s var(--ease), transform 1.1s var(--ease); transition-delay: calc(var(--i, 0) * 70ms); }
  .reveal-ready .reveal.in { opacity: 1; transform: none; }
}

/* ---------- responsive ---------- */
@media (max-width: 1023px) {
  .bubble-grid, .pressure-grid { grid-template-columns: 1fr; gap: 12px; align-content: center; }
  .bubble-vis { height: 38dvh; order: -1; }
  .bubble-text .h2 { font-size: clamp(1.6rem, 6vw, 2.4rem); }
  .steps { margin-top: 18px; }
  .step { padding: 12px 0; }
  .step p { font-size: 14.5px; }
  .scale-note { display: none; }
  .gauge { max-height: 42dvh; }
  .pressure-text .lead { font-size: 15px; margin-top: 12px; }
  .pbands { margin-top: 14px; }
  .pb { padding: 9px 0; font-size: 14.5px; }
  .pressure-text .note { margin-top: 10px; }
  .bubble-fact { grid-template-columns: 1fr; }
  .cellar-grid { grid-template-columns: 1fr; grid-template-rows: auto 1fr auto; }
  .cellar-vis { grid-column: 1; grid-row: 2; }
  .csteps { grid-column: 1; grid-row: 3; min-height: 190px; }
  .months { margin-top: 6px; font-size: 2.6rem; }
  .dosage-grid { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); grid-template-areas: "text text" "glass read" "scale scale"; gap: 32px; }
  .world-list { grid-template-columns: 1fr; }
  .dterms { height: auto; display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 0; border-top: 1px solid var(--line); margin-bottom: 20px; }
  .dterm, .dterm:nth-child(n) { position: static; width: auto; bottom: auto; padding: 10px 10px 12px; border-left: 0; border-bottom: 1px solid var(--line2); border-top: 2px solid transparent; margin-top: -1px; }
  .dterm.on { border-top-color: var(--accent); }
  .dt-name, .dt-r { white-space: normal; }
  .regions { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .map-inset { position: relative; right: auto; bottom: auto; width: 100%; margin-top: 16px; }
  .hist { grid-template-columns: repeat(2, minmax(0, 1fr)); row-gap: 40px; }
  .lib-grid { grid-template-columns: 1fr; }
  .ft-grid { grid-template-columns: 1fr; }
}
@media (max-width: 767px) {
  body { font-size: 16px; }
  .hero-sub { font-size: 1.02rem; }
  .bubble-fact { padding-block: 72px; }
  .fact-txt { margin-left: 0; }
  .mcard { flex-basis: 84vw; min-height: 0; }
  .mintro { flex-basis: 84vw; }
  .dosage-grid { grid-template-columns: 1fr; grid-template-areas: "text" "read" "glass" "scale"; }
  .dosage-glass { height: 220px; }
  .dterms { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .regions { grid-template-columns: 1fr; }
  .stats { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .st, .st:not(:nth-child(3n + 1)) { padding: 22px 12px 24px 0; border-left: 0; }
  .st:nth-child(even) { padding-left: 14px; border-left: 1px solid var(--line); }
  .hist { grid-template-columns: 1fr; }
  .lib { grid-template-columns: 1fr; }
  .lb:nth-child(even) { padding-left: 0; border-left: 0; }
  .chalk { min-height: 90dvh; }
}
@media (max-width: 767px) {
  .hero-in::before { inset: -6vh 0 0; background: linear-gradient(to top, var(--bg) 62%, color-mix(in srgb, var(--bg) 0%, transparent)); }
}

/* short laptop screens: keep pinned scenes inside the viewport */
@media (min-width: 1024px) and (max-height: 820px) {
  .pressure-text .h2, .bubble-text .h2 { font-size: clamp(1.7rem, 3.2vw, 2.7rem); }
  .pressure-text .lead { font-size: 15.5px; margin-top: 14px; }
  .pbands { margin-top: 16px; }
  .pb { padding: 9px 0; }
  .pressure-text .note { margin-top: 10px; }
  .gauge { max-height: 68dvh; }
  .steps { margin-top: 20px; }
  .step { padding: 14px 0 16px; }
  .mcard { min-height: 0; padding: 20px 20px 22px; }
  .mvis { aspect-ratio: 16 / 9; margin-bottom: 16px; }
  .hpan-track { align-items: center; }
}
/* short phones */
@media (max-width: 767px) and (max-height: 760px) {
  .bubble-vis { height: 30dvh; }
  .bubble-text .h2 { font-size: 1.45rem; }
  .steps { margin-top: 10px; }
  .step { padding: 8px 0; }
  .step .step-n { display: none; }
  .step h3 { font-size: 1.05rem; margin: 2px 0 4px; }
  .step p { font-size: 13.5px; line-height: 1.5; }
  .gauge { max-height: 32dvh; }
  .pressure-text .h2 { font-size: 1.55rem; }
  .pressure-text .lead { font-size: 14px; line-height: 1.5; }
  .pressure-text .note { display: none; }
  .pb { padding: 7px 0; font-size: 14px; }
  .pb-v { font-size: 12.5px; }
  .csteps { min-height: 170px; }
  .cstep p { font-size: 14.5px; }
}

/* =================== library pages =================== */
.pg { padding-top: calc(var(--hd) + clamp(32px, 6vh, 72px)); }
.crumbs { display: flex; flex-wrap: wrap; gap: 6px 10px; font: 400 12.5px/1.4 var(--mono); color: var(--ink3); }
.crumbs a { text-decoration: none; color: var(--ink2); }
.crumbs a:hover { color: var(--ink); text-decoration: underline; text-underline-offset: 3px; }
.crumbs li + li::before { content: "/"; margin-right: 10px; color: var(--ink3); }
.pg-h1 { margin-top: 22px; font: 350 clamp(2.2rem, 5.4vw, 4.6rem)/1.04 var(--display); letter-spacing: -.045em; max-width: 18ch; text-wrap: balance; }
.l-ja .pg-h1 { font-weight: 500; letter-spacing: 0; line-height: 1.25; font-size: clamp(1.85rem, 5vw, 4rem); max-width: 16em; }
.pg-alt { margin-top: 10px; font: 400 14px/1.4 var(--mono); color: var(--ink3); }
.pg-lead { margin-top: 24px; max-width: 60ch; font-size: clamp(1.1rem, 1.5vw, 1.3rem); line-height: 1.55; color: var(--ink); text-wrap: pretty; }
.pg-grid { display: grid; grid-template-columns: minmax(0, 8fr) minmax(0, 4fr); gap: clamp(32px, 5vw, 80px); margin-top: clamp(40px, 7vh, 80px); align-items: start; }
.pg-grid.solo { grid-template-columns: minmax(0, 1fr); }
.prose { max-width: 68ch; }
.prose h2 { font: 400 clamp(1.4rem, 2.2vw, 1.9rem)/1.15 var(--display); letter-spacing: -.03em; margin: 56px 0 16px; }
.prose h2:first-child { margin-top: 0; }
.prose h3 { font: 500 1.1rem/1.3 var(--sans); margin: 28px 0 8px; }
.prose p { margin: 0 0 16px; color: var(--ink2); }
.prose p strong, .prose li strong { color: var(--ink); font-weight: 550; }
.prose ul, .prose ol { margin: 0 0 18px; display: grid; gap: 8px; }
.prose ul li { position: relative; padding-left: 20px; color: var(--ink2); }
.prose ul li::before { content: ""; position: absolute; left: 2px; top: .7em; width: 6px; height: 6px; border: 1.2px solid var(--ink3); border-radius: 50%; }
.prose ol { counter-reset: o; }
.prose ol li { counter-increment: o; position: relative; padding-left: 34px; color: var(--ink2); }
.prose ol li::before { content: counter(o, decimal-leading-zero); position: absolute; left: 0; top: .15em; font: 500 12px/1.6 var(--mono); color: var(--ink3); }
.prose a, .pass a, .rel a { color: var(--ink); text-decoration: underline; text-decoration-color: var(--line); text-underline-offset: 3px; }
.prose a:hover, .pass a:hover { text-decoration-color: var(--accent); }
.prose .legend-note { border-left: 2px solid var(--accent); padding: 4px 0 4px 16px; color: var(--ink2); }
.tbl-wrap { overflow-x: auto; margin: 8px 0 24px; border-top: 1px solid var(--ink); }
.tbl { width: 100%; border-collapse: collapse; font-size: 14.5px; }
.tbl th { text-align: left; font: 500 12px/1.4 var(--mono); color: var(--ink3); padding: 12px 14px 10px 0; border-bottom: 1px solid var(--line); white-space: nowrap; }
.tbl td { padding: 12px 14px 12px 0; border-bottom: 1px solid var(--line2); vertical-align: top; color: var(--ink2); }
.tbl td:first-child { color: var(--ink); font-weight: 450; }
.tbl .num { font-family: var(--mono); font-size: 13.5px; white-space: nowrap; }
/* passport aside */
.pass { position: sticky; top: calc(var(--hd) + 24px); border-top: 1px solid var(--ink); }
.pass h2 { font: 500 12px/1 var(--mono); letter-spacing: .04em; color: var(--ink3); padding: 14px 0; }
.pass dl { margin: 0; }
.pass .row { display: grid; grid-template-columns: minmax(0, 2fr) minmax(0, 3fr); gap: 12px; padding: 12px 0; border-bottom: 1px solid var(--line2); }
.pass dt { font-size: 13.5px; color: var(--ink3); }
.pass dd { margin: 0; font-size: 14.5px; color: var(--ink); }
.pass dd.big { font: 300 1.9rem/1 var(--display); letter-spacing: -.04em; }
/* related */
.rel { margin-top: clamp(56px, 9vh, 104px); border-top: 1px solid var(--ink); padding-top: 18px; }
.rel h2 { font: 400 1.3rem/1.2 var(--display); letter-spacing: -.02em; }
.rel-list { margin-top: 18px; display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 0 28px; }
.rel-list a { display: flex; justify-content: space-between; gap: 12px; padding: 13px 0; border-bottom: 1px solid var(--line2); text-decoration: none; }
.rel-list a span:last-child { font: 400 12px/1.6 var(--mono); color: var(--ink3); }
.rel-list a:hover span:first-child { color: var(--accent-ink); }
/* hub */
.hub-list { margin-top: clamp(40px, 7vh, 80px); display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 0 clamp(20px, 3vw, 40px); border-top: 1px solid var(--ink); }
.hub-item { display: grid; gap: 6px; padding: 22px 0 24px; border-bottom: 1px solid var(--line); text-decoration: none; }
.hub-item .hi-n { font: 400 1.25rem/1.2 var(--display); letter-spacing: -.025em; }
.hub-item .hi-d { font-size: 14.5px; color: var(--ink2); }
.hub-item .hi-m { font: 400 12px/1.4 var(--mono); color: var(--ink3); }
.hub-item:hover .hi-n { color: var(--accent-ink); }
.hub-group { margin-top: 56px; font: 400 1.5rem/1.2 var(--display); letter-spacing: -.03em; }
.hub-group + .hub-list { margin-top: 18px; }
.pg-sources { margin-top: clamp(56px, 9vh, 104px); border-top: 1px solid var(--line); padding-top: 18px; }
.pg-sources h2 { font: 400 1.2rem/1 var(--display); letter-spacing: -.02em; }
.pg-checked { margin-top: 10px; font: 400 12.5px/1.5 var(--mono); color: var(--ink3); }
.flag { display: inline-block; font: 500 11px/1 var(--mono); letter-spacing: .04em; text-transform: uppercase; padding: 4px 6px; border: 1px solid var(--accent); color: var(--accent-ink); vertical-align: middle; margin-left: 6px; }
@media (max-width: 1023px) {
  .pg-grid { grid-template-columns: minmax(0, 1fr); }
  .pass { position: static; order: -1; }
  .rel-list, .hub-list { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 767px) {
  .rel-list, .hub-list { grid-template-columns: 1fr; }
  .pass .row { grid-template-columns: 1fr; gap: 4px; }
}
.lb { padding: 0; }
.lb a { display: grid; gap: 6px; padding: 24px 20px 26px 0; text-decoration: none; color: inherit; height: 100%; }
.lb:nth-child(even) { padding-left: 0; }
.lb:nth-child(even) a { padding-left: 20px; }
.lb a:hover .lb-n { color: var(--accent); }
.lb-s { text-transform: none !important; letter-spacing: 0 !important; }
@media (max-width: 767px) { .lb:nth-child(even) a { padding-left: 0; } }

/* Japanese: phrase-aware breaks, no small kana at line start */
:lang(ja) h1, :lang(ja) h2, :lang(ja) h3 { word-break: auto-phrase; line-break: strict; }
:lang(ja) p, :lang(ja) li, :lang(ja) td { line-break: strict; }

/* =================== course =================== */
.vh { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.ls-top { margin-top: 22px; display: flex; flex-wrap: wrap; align-items: center; gap: 12px 24px; }
.ls-kicker { font: 500 12.5px/1.4 var(--mono); color: var(--accent-ink); letter-spacing: .02em; }
.ls-prog { display: flex; gap: 4px; }
.ls-prog a { display: block; width: 26px; height: 26px; position: relative; }
.ls-prog a::before { content: ""; position: absolute; left: 0; right: 0; top: 11px; height: 4px; background: var(--line); transition: background .3s; }
.ls-prog a.is-done::before { background: var(--ink3); }
.ls-prog a[aria-current]::before { background: var(--accent); }
.ls-prog a:hover::before { background: var(--ink); }
.ls-top + .pg-h1 { margin-top: 14px; }

.ls-run { display: grid; grid-template-columns: minmax(0, 6fr) minmax(0, 5fr); gap: clamp(32px, 5vw, 88px); margin-top: clamp(40px, 7vh, 80px); align-items: start; }
.ls-stage { position: sticky; top: calc(var(--hd) + 16px); height: calc(100svh - var(--hd) - 32px); max-height: 760px; display: grid; place-items: center; }
.ls-frame { position: relative; width: min(100%, calc(100svh - var(--hd) - 48px), 640px); aspect-ratio: 1; border: 1px solid var(--line); background: var(--surface); }
.ls-frame::after { content: ""; position: absolute; inset: 0; pointer-events: none; background-image: radial-gradient(var(--line2) 1px, transparent 1px); background-size: 20px 20px; opacity: .7; }
.sc { position: absolute; inset: 0; opacity: 0; transition: opacity .5s var(--ease); }
.sc.on { opacity: 1; position: absolute; }
.sc .sv { width: 100%; height: 100%; display: block; position: relative; z-index: 1; overflow: visible; }
.ls-steps { counter-reset: s; padding-bottom: 30vh; }
.ls-step { min-height: 72svh; display: flex; flex-direction: column; justify-content: center; padding: 24px 0; opacity: .32; transition: opacity .45s var(--ease); }
.ls-step.on { opacity: 1; }
.ls-step:first-child { min-height: 56svh; justify-content: flex-start; padding-top: 8px; }
.ls-n { font: 500 12px/1 var(--mono); color: var(--accent-ink); }
.ls-step h2 { margin-top: 14px; font: 400 clamp(1.45rem, 2.4vw, 2.1rem)/1.12 var(--display); letter-spacing: -.035em; text-wrap: balance; }
.ls-step p { margin-top: 14px; color: var(--ink2); font-size: 1.06rem; line-height: 1.62; max-width: 52ch; }
.ls-step a, .ls-keys a, .qz-why a { color: var(--ink); text-decoration: underline; text-decoration-color: var(--line); text-underline-offset: 3px; }

.ls-keys { margin-top: clamp(24px, 4vh, 56px); }
.ls-keys h2, .ls-quiz h2 { font: 400 clamp(1.6rem, 3vw, 2.6rem)/1.1 var(--display); letter-spacing: -.04em; }
.ls-keys ol { margin-top: 24px; display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 0 clamp(20px, 3vw, 40px); border-top: 1px solid var(--ink); counter-reset: k; }
.ls-keys li { counter-increment: k; padding: 18px 0 20px; border-bottom: 1px solid var(--line); color: var(--ink); font-size: 1.02rem; line-height: 1.5; display: grid; grid-template-columns: 34px 1fr; }
.ls-keys li::before { content: counter(k, decimal-leading-zero); font: 500 12px/1.9 var(--mono); color: var(--accent-ink); }

.ls-quiz { margin-top: clamp(64px, 10vh, 120px); }
.qz { margin-top: 28px; padding-top: 20px; border-top: 1px solid var(--line); max-width: 860px; }
.qz-q { font: 450 1.15rem/1.4 var(--sans); display: grid; grid-template-columns: 34px 1fr; }
.qz-k { font: 500 12px/2 var(--mono); color: var(--ink3); }
.qz-a { margin: 14px 0 0 34px; display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 8px; }
.qz-o { display: grid; grid-template-columns: 26px 1fr; align-items: start; text-align: left; gap: 8px; padding: 12px 14px; min-height: 48px; font: 400 15px/1.4 var(--sans); color: var(--ink); background: transparent; border: 1px solid var(--line); cursor: pointer; transition: border-color .2s, background .2s, transform .1s; }
.qz-o:hover { border-color: var(--ink); }
.qz-o:active { transform: translateY(1px); }
.qz-o:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.qz-l { font: 500 12px/1.7 var(--mono); color: var(--ink3); }
.qz.done .qz-o { cursor: default; opacity: .55; }
.qz.done .qz-o:hover { border-color: var(--line); }
.qz .qz-o.ok { opacity: 1; border-color: var(--glass); background: color-mix(in srgb, var(--glass) 12%, transparent); }
.qz .qz-o.no { opacity: 1; border-color: var(--accent); background: color-mix(in srgb, var(--accent) 9%, transparent); }
.qz-why { margin: 14px 0 0 34px; color: var(--ink2); max-width: 70ch; line-height: 1.55; }
.qz-v { color: var(--ink); font-weight: 550; }
.qz-score { margin-top: 32px; font: 300 clamp(1.8rem, 4vw, 3rem)/1 var(--display); letter-spacing: -.04em; color: var(--accent-ink); }

.ls-nav { margin-top: clamp(64px, 10vh, 120px); display: grid; grid-template-columns: 1fr 1fr; gap: 0 clamp(20px, 3vw, 40px); border-top: 1px solid var(--ink); }
.ln { display: grid; gap: 10px; padding: 22px 0 26px; text-decoration: none; color: var(--ink); }
.ln-next { grid-column: 2; text-align: right; justify-items: end; }
.ln-k { display: inline-flex; align-items: center; gap: 8px; font: 500 12.5px/1 var(--mono); color: var(--ink3); }
.ln-k .ic { width: 16px; height: 16px; }
.ln-t { font: 400 clamp(1.2rem, 2vw, 1.6rem)/1.2 var(--display); letter-spacing: -.03em; }
.ln:hover .ln-t { color: var(--accent-ink); }

/* course hub */
.lc-cta { margin-top: 32px; }
.lc-list { margin-top: clamp(48px, 8vh, 96px); display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: clamp(28px, 3vw, 44px) clamp(20px, 3vw, 40px); counter-reset: l; }
.lc-i a { display: grid; gap: 8px; text-decoration: none; color: var(--ink); }
.lc-i .sc { position: relative; inset: auto; opacity: 1; aspect-ratio: 4 / 3; border: 1px solid var(--line); background: var(--surface); margin-bottom: 10px; transition: border-color .3s; }
.lc-i a:hover .sc { border-color: var(--ink); }
.lc-n { font: 500 12px/1 var(--mono); color: var(--accent-ink); }
.lc-t { font: 400 1.3rem/1.2 var(--display); letter-spacing: -.03em; }
.lc-i a:hover .lc-t { color: var(--accent-ink); }
.lc-d { font-size: 14.5px; color: var(--ink2); }
.lc-m { font: 400 12px/1.4 var(--mono); color: var(--ink3); display: flex; gap: 12px; align-items: center; }
.lc-done { display: none; align-items: center; gap: 4px; color: var(--glass); }
.lc-done .ic { width: 14px; height: 14px; }
.is-done .lc-done { display: inline-flex; }
.lb-learn .lb-n { color: var(--accent-ink); }

/* scene drawing */
.sv .ln { fill: none; stroke: var(--ink); stroke-width: 1.6; stroke-linejoin: round; stroke-linecap: round; }
.sv .ln2 { fill: none; stroke: var(--ink3); stroke-width: 1.2; stroke-linecap: round; }
.sv .liq { fill: var(--glass2); opacity: .28; }
.sv .liq-s { fill: var(--glass2); }
.sv .juice { fill: #E9D98B; opacity: .7; }
.sv .juice-s { fill: none; stroke: #D9C467; stroke-width: 3; stroke-dasharray: 6 8; stroke-linecap: round; }
.sv .bb { fill: none; stroke: var(--bubble); stroke-width: 1.1; }
.sv .bb.big { stroke-width: 1.6; }
.sv .sug { fill: var(--surface); stroke: var(--ink2); stroke-width: 1; }
.sv .yst { fill: var(--accent); opacity: .85; }
.sv .cork { fill: #B88A5A; stroke: var(--ink); stroke-width: 1.2; }
.sv .cap { fill: var(--ink3); }
.sv .sed { fill: var(--ink2); }
.sv .ice { fill: #CFE6F0; stroke: #8FB7C9; stroke-width: 1; }
.sv .acc-ln, .sv .needle { fill: none; stroke: var(--accent); stroke-width: 2.2; stroke-linecap: round; }
.sv .acc-f { fill: var(--accent); }
.sv .hub { fill: var(--ink); }
.sv .band { fill: none; stroke: var(--line); stroke-width: 7; transition: stroke .4s; }
.sv .band.on { stroke: var(--glass2); }
.sv .band-r { fill: var(--accent); opacity: .18; }
.sv .tx { font: 400 12px var(--mono); fill: var(--ink2); }
.sv .tx.sm { font-size: 10.5px; }
.sv .txb { font: 450 15px var(--sans); fill: var(--ink); }
.sv .txbig { font: 300 44px var(--display); fill: var(--ink); letter-spacing: -.04em; }
.sv .txbig.sm { font-size: 22px; }
.sv .wall { fill: var(--glass); opacity: .22; }
.sv .fibre { fill: none; stroke: #B79A6B; stroke-width: 7; stroke-linecap: round; }
.sv .pocket { fill: var(--surface); stroke: var(--ink2); stroke-width: 1; }
.sv .jet { fill: none; stroke: var(--ink2); stroke-width: 2; }
.sv .drop { fill: var(--glass2); }
.sv .row text { transition: fill .3s; }
.sv .row.on .txb { fill: var(--accent-ink); }
.sv .tick { fill: var(--line); }
.sv .tick.on { fill: var(--accent); }
.sv .gr-d { fill: #3E3150; stroke: var(--ink); stroke-width: .8; }
.sv .gr-w { fill: #C9CF8A; stroke: var(--ink); stroke-width: .8; }
.sv .bar-d { fill: #3E3150; }
.sv .bar-w { fill: #C9CF8A; stroke: var(--ink); stroke-width: .8; }
.sv .cube { fill: var(--surface); stroke: var(--ink); stroke-width: 1.2; }
.sv .land { fill: var(--line); }
.sv .dot { fill: var(--ink); transition: opacity .4s; }
.sv .dot.m-trad { fill: var(--accent); }
.sv .dot.m-tank { fill: var(--glass); }
.sv .dot.dim { opacity: .15; }
.sv .halo { fill: none; stroke: var(--accent); stroke-width: 1.2; }
.sv .paper { fill: #F4EFE2; stroke: var(--ink); stroke-width: 1.2; }
.sv .lbl-a { font: 500 26px var(--display); fill: #1C1B17; letter-spacing: .06em; }
.sv .lbl-b { font: 500 20px var(--sans); fill: #1C1B17; letter-spacing: .14em; }
.sv .lbl-c { font: 400 14px var(--sans); fill: #1C1B17; letter-spacing: .18em; }
.sv .lbl-d { font: 400 11px var(--mono); fill: #1C1B17; }
.sv [class^="lbl-"] { transition: opacity .35s; }
.sv .dim[class^="lbl-"] { opacity: .3; }
.sv .hl { fill: none; stroke: var(--accent); stroke-width: 2.4; }
.l-ja .sv .txb { font-size: 14px; }

@media (max-width: 899px) {
  .ls-run { grid-template-columns: minmax(0, 1fr); gap: 0; }
  .ls-stage { top: var(--hd); height: auto; z-index: 3; background: var(--bg); padding: 12px 0 10px; margin-inline: calc(var(--gut) * -1); padding-inline: var(--gut); }
  .ls-frame { width: min(100%, 42svh); }
  .ls-step, .ls-step:first-child { min-height: 52svh; justify-content: flex-start; padding: 28px 0 24px; }
  .ls-steps { padding-bottom: 12vh; }
  .lc-list { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 599px) {
  .lc-list { grid-template-columns: minmax(0, 1fr); }
  .ls-nav { grid-template-columns: 1fr; }
  .ln-next { grid-column: 1; }
  .qz-a, .qz-why { margin-left: 0; }
  .ls-prog a { width: 22px; }
}
@media (prefers-reduced-motion: reduce) { .sc, .ls-step { transition: none; } }

/* =================== footer nav, search, faq, charts, interactives =================== */
.ft-grid { grid-template-columns: minmax(0, 6fr) minmax(0, 3fr) minmax(0, 3fr); }
.ft-grid:not(:has(.ft-src)) { grid-template-columns: minmax(0, 7fr) minmax(0, 5fr); }
.ft-links { margin: 16px 0 28px; display: grid; gap: 8px; font-size: 14.5px; }
.ft-nav .ft-links { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 8px 20px; }
.ft-grid:has(.ft-src) .ft-nav .ft-links { grid-template-columns: 1fr; }
.ft-links a { color: var(--ink2); text-decoration: none; }
.ft-links a:hover { color: var(--ink); text-decoration: underline; text-underline-offset: 3px; }
@media (max-width: 1023px) { .ft-grid, .ft-grid:not(:has(.ft-src)) { grid-template-columns: minmax(0, 1fr); } }

.srch-btn { width: 44px; height: 44px; display: grid; place-items: center; background: transparent; border: 1px solid var(--line); color: var(--ink); cursor: pointer; }
.srch-btn:hover { border-color: var(--ink); }
.srch-btn .ic { width: 18px; height: 18px; }
.srch { position: fixed; inset: 0; z-index: 80; background: color-mix(in srgb, var(--bg) 92%, transparent); backdrop-filter: blur(6px); display: none; }
.srch.open { display: block; }
.srch-in { max-width: 760px; margin: calc(var(--hd) + 24px) auto 0; padding-inline: var(--gut); }
.srch-row { display: flex; gap: 10px; border-bottom: 1px solid var(--ink); }
.srch-q { flex: 1; min-width: 0; font: 350 clamp(1.4rem, 3vw, 2.1rem)/1.2 var(--display); letter-spacing: -.03em; padding: 14px 0; background: transparent; border: 0; color: var(--ink); outline: none; }
.srch-x { background: transparent; border: 0; color: var(--ink3); cursor: pointer; font: 500 12.5px var(--mono); }
.srch-res { margin-top: 12px; max-height: calc(100svh - var(--hd) - 140px); overflow-y: auto; }
.srch-res a { display: grid; gap: 4px; padding: 14px 0; border-bottom: 1px solid var(--line2); text-decoration: none; color: var(--ink); }
.srch-res a:focus-visible, .srch-res a.sel { background: var(--bg2); outline: none; }
.srch-res .sr-n { font: 450 1.05rem/1.3 var(--sans); }
.srch-res .sr-d { font-size: 14px; color: var(--ink2); }
.srch-res .sr-s { font: 400 11.5px/1.3 var(--mono); color: var(--accent-ink); }
.srch-res mark { background: color-mix(in srgb, var(--accent) 22%, transparent); color: inherit; }
.srch-none { padding: 20px 0; color: var(--ink3); }

.faq { margin-top: 48px; border-top: 1px solid var(--ink); }
.faq h2 { margin: 18px 0 8px !important; }
.faq-i { border-bottom: 1px solid var(--line); }
.faq-i summary { cursor: pointer; padding: 16px 28px 16px 0; font: 450 1.05rem/1.4 var(--sans); list-style: none; position: relative; }
.faq-i summary::-webkit-details-marker { display: none; }
.faq-i summary::after { content: "+"; position: absolute; right: 0; top: 14px; font: 300 1.4rem/1 var(--display); color: var(--accent-ink); }
.faq-i[open] summary::after { content: "−"; }
.faq-a p { color: var(--ink2); margin: 0 0 16px; }

.chart { margin: 8px 0 36px; border-top: 1px solid var(--ink); padding-top: 14px; }
.chart figcaption { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 6px 18px; }
.ch-t { font: 450 1rem/1.3 var(--sans); }
.ch-u { font: 400 12px/1.6 var(--mono); color: var(--ink3); }
.ch-leg { display: flex; gap: 18px; margin-top: 8px; font-size: 13px; color: var(--ink2); }
.ch-leg li { display: flex; align-items: center; gap: 6px; }
.ch-k { width: 14px; height: 3px; display: inline-block; background: var(--ink); }
.ch { width: 100%; height: auto; margin-top: 8px; overflow: visible; }
.ch-grid { stroke: var(--line2); }
.ch-y, .ch-x { font: 400 11px var(--mono); fill: var(--ink3); }
.ch-line { fill: none; stroke-width: 2; }
.ch-s0.ch-line { stroke: var(--ink); } .ch-s1.ch-line { stroke: var(--accent); } .ch-s2.ch-line { stroke: var(--glass2); }
.ch-pt.ch-s0, rect.ch-s0, .ch-k.ch-s0 { fill: var(--ink); background: var(--ink); }
.ch-pt.ch-s1, rect.ch-s1, .ch-k.ch-s1 { fill: var(--accent); background: var(--accent); }
.ch-pt.ch-s2, rect.ch-s2, .ch-k.ch-s2 { fill: var(--glass2); background: var(--glass2); }
.ch-pt { stroke: var(--bg); stroke-width: 1.5; }
.ch-end { font: 500 12px var(--mono); fill: var(--ink); }
.ch-s1t { fill: var(--accent-ink); }

.ixs { margin: 4px 0 40px; border: 1px solid var(--line); background: var(--surface); }
.ixs-frame { position: relative; aspect-ratio: 16 / 10; }
.ixs-frame .sc { opacity: 1; }
.ixs figcaption { border-top: 1px solid var(--line); padding: 12px; display: grid; gap: 10px; }
.ixs-bs { display: flex; flex-wrap: wrap; gap: 6px; }
.ixs-b { min-height: 40px; padding: 8px 12px; font: 450 13.5px/1.2 var(--sans); background: transparent; border: 1px solid var(--line); color: var(--ink); cursor: pointer; display: grid; text-align: left; }
.ixs-b span { font: 400 11px var(--mono); color: var(--ink3); }
.ixs-b:hover { border-color: var(--ink); }
.ixs-b.on { border-color: var(--accent); background: color-mix(in srgb, var(--accent) 8%, transparent); }
.ixs-more { display: inline-flex; gap: 8px; align-items: center; font: 500 12.5px var(--mono); color: var(--accent-ink); text-decoration: none; }
.ixs-more .ic { width: 15px; height: 15px; }

.ix-map { margin-top: 40px; }
.ix-map .world-maps { margin-top: 18px; padding: 0; }
.ix-chips { display: flex; flex-wrap: wrap; gap: 6px; }
.chip { display: inline-flex; align-items: center; gap: 8px; min-height: 40px; padding: 8px 14px; font: 450 14px var(--sans); background: transparent; border: 1px solid var(--line); color: var(--ink); cursor: pointer; }
.chip.on { border-color: var(--ink); background: var(--surface); }
.chip .rg-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--ink); }
.chip-tank .rg-dot { background: var(--accent); } .chip-mixed .rg-dot { background: var(--glass); }
.ix-map .regions { margin-top: 24px; display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 0 28px; }
.ix-map .regions a { display: flex; gap: 10px; align-items: center; padding: 10px 0; border-bottom: 1px solid var(--line2); text-decoration: none; color: var(--ink); }
.ix-map .regions a:hover .rg-n { color: var(--accent-ink); }
.ix-map .rg-c { margin-left: auto; font: 400 11.5px var(--mono); color: var(--ink3); }
.ix-map .rg-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--ink); flex: none; }
.ix-map .rg-tank .rg-dot { background: var(--accent); } .ix-map .rg-mixed .rg-dot { background: var(--glass); }
.ix-map .off { opacity: .14; }
.ix-map .regions .off { display: none; }
.ix-map .pin { cursor: pointer; }
@media (max-width: 767px) { .ix-map .regions { grid-template-columns: minmax(0, 1fr); } }

.vmap { margin: 8px 0 40px; border-top: 1px solid var(--ink); padding-top: 14px; }
.vmap figcaption { font: 450 1rem var(--sans); }
.vmap svg { width: 100%; height: auto; margin-top: 10px; }
.vm circle { stroke: var(--bg); stroke-width: 1.5; }
.vm-gc circle, .vm-k.vm-gc { fill: var(--accent); background: var(--accent); }
.vm-pc circle, .vm-k.vm-pc { fill: var(--glass2); background: var(--glass2); }
.vm text { font: 500 13px var(--sans); fill: var(--ink); paint-order: stroke; stroke: var(--bg); stroke-width: 3px; }
.vm:hover circle { stroke: var(--ink); }
.vm-leg { display: flex; gap: 18px; margin-top: 8px; font-size: 13px; color: var(--ink2); }
.vm-leg li { display: flex; gap: 6px; align-items: center; }
.vm-k { width: 10px; height: 10px; border-radius: 50%; display: inline-block; }

.ix-sugar { margin: 8px 0 40px; border: 1px solid var(--line); background: var(--surface); padding: 20px; }
.ix-sugar h2 { margin: 0 0 14px !important; font-size: 1.3rem !important; }
.ixg { display: grid; grid-template-columns: 1fr auto auto; align-items: end; gap: 12px; }
.ixg-l { display: grid; gap: 10px; font: 400 13px var(--mono); color: var(--ink3); }
.ixg-r { width: 100%; accent-color: var(--accent); height: 32px; }
.ixg-v { font: 300 2.6rem/1 var(--display); letter-spacing: -.04em; min-width: 3ch; text-align: right; }
.ixg-u { font: 400 13px var(--mono); color: var(--ink3); padding-bottom: 6px; }
.ixg-out { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 12px; margin-top: 18px; border-top: 1px solid var(--line); padding-top: 14px; }
.ixg-out > div { display: grid; gap: 6px; }
.ixg-k { font: 400 12px var(--mono); color: var(--ink3); }
.ixg-term, .ixg-glass, .ixg-bottle { font: 400 1.25rem/1.2 var(--display); letter-spacing: -.02em; }
.ixg-note { margin-top: 14px !important; font-size: 13px; color: var(--ink3) !important; }
@media (max-width: 599px) { .ixg-out { grid-template-columns: 1fr; } }

.ixa { margin: 4px 0 28px; }
.ixa-f { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 14px; }
.ixa-rows { display: grid; gap: 4px; }
.ixa-row { display: grid; grid-template-columns: minmax(0, 15rem) minmax(0, 1fr) 4.5rem; gap: 12px; align-items: center; font-size: 13.5px; }
.ixa-row .n { color: var(--ink); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.ixa-row .n small { color: var(--ink3); font: 400 11px var(--mono); margin-right: 6px; }
.ixa-bar { height: 12px; background: var(--line2); position: relative; }
.ixa-bar i { position: absolute; left: 0; top: 0; bottom: 0; background: var(--glass2); transition: width .5s var(--ease); }
.ixa-row.tank .ixa-bar i { background: var(--accent); }
.ixa-row .m { font: 500 12.5px var(--mono); text-align: right; }
@media (max-width: 599px) { .ixa-row { grid-template-columns: minmax(0, 1fr) 3.5rem; } .ixa-row .ixa-bar { grid-column: 1 / -1; grid-row: 2; } }

.ixb { margin: 4px 0 28px; overflow-x: auto; }
.ixb svg { min-width: 680px; width: 100%; height: auto; }
.ixb .bt { fill: var(--glass2); fill-opacity: .35; stroke: var(--ink); stroke-width: 1.2; }
.ixb .bt.same { fill: var(--accent); fill-opacity: .25; }
.ixb text { font: 400 10.5px var(--mono); fill: var(--ink2); }
.ixb text.nm { font: 500 11px var(--sans); fill: var(--ink); }

.ixt { margin: 4px 0 24px; display: grid; gap: 12px; }
.ixt-row { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }
.ixt-q { flex: 1; min-width: 200px; min-height: 42px; padding: 8px 12px; font: 400 15px var(--sans); background: var(--surface); border: 1px solid var(--line); color: var(--ink); }
.ixt-q:focus { outline: 2px solid var(--accent); outline-offset: 1px; }
.ixt-strip { display: grid; grid-auto-flow: column; grid-auto-columns: 1fr; align-items: end; gap: 2px; height: 56px; }
.ixt-strip button { background: var(--glass2); border: 0; padding: 0; cursor: pointer; min-height: 2px; }
.ixt-strip button:hover { background: var(--accent); }
.ixt-ax { display: flex; justify-content: space-between; font: 400 11px var(--mono); color: var(--ink3); }
.tbl tr.hide { display: none; }
.tbl tr.flash td { background: color-mix(in srgb, var(--accent) 12%, transparent); }
.prose .ch-leg li, .prose .vm-leg li, .prose .ix-map li, .prose .ixs li { padding-left: 0; color: var(--ink2); }
.prose .ch-leg li::before, .prose .vm-leg li::before, .prose .ix-map li::before, .ix-map .rg::before { display: none; content: none; }
.ix-map .regions, .ix-map .rg { list-style: none; }
.srch-q::-webkit-search-cancel-button { display: none; }
.ixt-q::-webkit-search-cancel-button { opacity: .6; }
.ix-map .rg { padding: 0; }
.vmap svg { max-height: 820px; }
.vm text { font-size: 15px; }
.pg-h1 { overflow-wrap: normal; }
.prose .vm, .vm { text-decoration: none; } .vm text { text-decoration: none; }