:root {
  color-scheme: light;
  --page: #cfdcd4;
  --surface: #ffffff;
  --surface-2: #eef3ef;
  --text-primary: #0f1f19;
  --text-secondary: #3e5149;
  --text-muted: #687a71;
  --grid: #dde6e0;
  --axis: #b7c6bd;
  --border: rgba(11, 21, 18, 0.12);
  --accent: #157a55;
  --accent-ink: #0f5e41;
  --accent-wash: rgba(21, 122, 85, 0.08);
  --kicker: #a8690a;
  --ink-dark: #0b1512;
  --ink-dark-2: #13221d;
  --on-dark: #ecf4ee;
  --on-dark-muted: #9fb2a8;
  --amber: #ffc000;
  --warning: #fab219;
  --critical: #d03b3b;
  --good: #0ca30c;
  --shadow: 0 1px 2px rgba(11, 21, 18, 0.08), 0 4px 14px rgba(11, 21, 18, 0.06);
  --header: #0b1512;

  --series-1: #2a78d6;
  --series-2: #eb6834;
  --series-3: #1baf7a;
  --series-4: #eda100;
  --series-5: #e87ba4;
  --series-6: #008300;
  --series-7: #4a3aa7;
  --series-8: #e34948;
  --neutral-flow: #a8a7a0;
  --link-opacity: 0.4;

  --radius: 10px;
  --font: "Figtree", "Aptos", system-ui, -apple-system, "Segoe UI", sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark;
    --page: #070e0c;
    --surface: #0f1a16;
    --surface-2: #16241f;
    --text-primary: #ecf4ee;
    --text-secondary: #c2d1c8;
    --text-muted: #9fb2a8;
    --grid: #1f2e28;
    --axis: #2f423a;
    --border: rgba(236, 244, 238, 0.10);
    --accent: #3fbf8a;
    --accent-ink: #6fd6aa;
    --accent-wash: rgba(63, 191, 138, 0.12);
    --kicker: #ffc000;
    --good: #0ca30c;
    --shadow: none;
    --header: #0b1512;
    --series-1: #3987e5;
    --series-2: #d95926;
    --series-3: #199e70;
    --series-4: #c98500;
    --series-5: #d55181;
    --series-6: #008300;
    --series-7: #9085e9;
    --series-8: #e66767;
    --neutral-flow: #5d5c57;
    --link-opacity: 0.62;
  }
}
:root[data-theme="dark"] {
  color-scheme: dark;
  --page: #070e0c;
  --surface: #0f1a16;
  --surface-2: #16241f;
  --text-primary: #ecf4ee;
  --text-secondary: #c2d1c8;
  --text-muted: #9fb2a8;
  --grid: #1f2e28;
  --axis: #2f423a;
  --border: rgba(236, 244, 238, 0.10);
  --accent: #3fbf8a;
  --accent-ink: #6fd6aa;
  --accent-wash: rgba(63, 191, 138, 0.12);
  --kicker: #ffc000;
  --good: #0ca30c;
  --shadow: none;
  --header: #0b1512;
  --series-1: #3987e5;
  --series-2: #d95926;
  --series-3: #199e70;
  --series-4: #c98500;
  --series-5: #d55181;
  --series-6: #008300;
  --series-7: #9085e9;
  --series-8: #e66767;
  --neutral-flow: #5d5c57;
  --link-opacity: 0.62;
}

* { box-sizing: border-box; }
html, body { margin: 0; }
body {
  background: var(--page);
  color: var(--text-primary);
  font: 400 15px/1.5 var(--font);
  -webkit-font-smoothing: antialiased;
}
[hidden] { display: none !important; }
h1, h2, h3 { margin: 0; font-weight: 650; letter-spacing: -0.01em; }
h1 { font-size: 26px; line-height: 1.2; }
h2 { font-size: 17px; }
h3 { font-size: 14px; color: var(--text-secondary); }
p { margin: 0; }
b, strong { font-weight: 600; }
button, input, select { font: inherit; color: inherit; }
.hint { font-size: 13px; color: var(--text-muted); margin-top: 8px; }

/* ------------------------------------------------------------ top bar */
.topbar {
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  padding: 12px 24px; background: var(--header); color: var(--on-dark); border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}
.brand-block { display: flex; align-items: baseline; gap: 12px; flex-wrap: wrap; min-width: 0; }
button.brand {
  display: flex; align-items: center; gap: 10px; background: none; border: none; padding: 0; cursor: pointer;
  font-weight: 700; font-size: 17px; color: var(--on-dark); letter-spacing: -0.01em; white-space: nowrap;
}
.brand-mark { width: 30px; height: 30px; border-radius: 8px; background: var(--accent); color: #fff; display: grid; place-items: center; align-self: center; }
.brand-mark .logo-sankey { width: 24px; height: 24px; fill: #fff; }
.brand-by { color: var(--on-dark-muted); font-size: 13px; text-decoration: none; white-space: nowrap; display: inline-flex; align-items: center; gap: 4px; }
.brand-by b { color: var(--amber); font-weight: 600; }
.brand-by:hover { color: var(--on-dark); }
.brand-by:hover b { text-decoration: underline; }
.topbar-btn { color: var(--on-dark-muted) !important; }
.topbar-btn:hover { background: rgba(255, 255, 255, 0.08) !important; color: var(--on-dark) !important; }
@media (max-width: 560px) { button.brand { font-size: 15px; } .brand-by { font-size: 12px; } }

.stage { max-width: 1180px; margin: 0 auto; padding: 28px 24px 64px; }
@media (max-width: 720px) { .stage { padding: 16px 16px 48px; } .topbar { padding: 10px 16px; } h1 { font-size: 22px; } }

.card {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  box-shadow: var(--shadow); padding: 22px;
}
.card + .card, #detail .card { margin-top: 16px; }
.panel-head h2 { display: inline-flex; align-items: center; gap: 8px; }
.panel-head h2 .ic { color: var(--accent); }
.panel-head { display: flex; justify-content: space-between; align-items: center; gap: 12px; margin-bottom: 12px; flex-wrap: wrap; }
.step-kicker { font-size: 12px; font-weight: 700; letter-spacing: 0.1em; text-transform: uppercase; color: var(--kicker); display: inline-flex; align-items: center; gap: 6px; }

/* ------------------------------------------------------------ icons */
.ic { width: 20px; height: 20px; flex: none; vertical-align: -4px; }
.ic-sm .ic, .ic.ic-sm { width: 16px; height: 16px; vertical-align: -3px; }
.ic-xs .ic, .ic.ic-xs { width: 12px; height: 12px; vertical-align: -1px; }
.ic-wrap { display: inline-flex; align-items: center; }

/* ------------------------------------------------------------ buttons */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 7px;
  padding: 8px 16px; border-radius: 8px; cursor: pointer; font-weight: 550; font-size: 14px;
  background: var(--surface); border: 1px solid var(--axis); transition: background 0.12s, border-color 0.12s;
}
.btn:hover { background: var(--surface-2); }
.btn:disabled { opacity: 0.4; cursor: default; }
.btn.primary, .btn.calc { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn.primary:hover, .btn.calc:hover { background: var(--accent-ink); border-color: var(--accent-ink); }
.btn.calc { width: 100%; padding: 11px 16px; font-size: 15px; margin-top: 16px; }
.btn.ghost { border-color: transparent; background: transparent; color: var(--text-secondary); }
.btn.ghost:hover { background: var(--surface-2); }
.btn.small { font-size: 13px; padding: 5px 10px; }
.btn-link { background: none; border: none; color: var(--accent); cursor: pointer; padding: 0; font-size: 13px; font-weight: 550; }
button:focus-visible, input:focus-visible, select:focus-visible, a:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

/* ------------------------------------------------------------ stepper */
.stepper { list-style: none; padding: 0; margin: 0 0 10px; display: grid; grid-template-columns: repeat(4, 1fr); gap: 8px; }
.stepper button {
  width: 100%; display: flex; align-items: center; gap: 10px; text-align: left; cursor: pointer;
  background: none; border: none; padding: 6px 2px; color: var(--text-muted); font-weight: 500; font-size: 14px;
}
.stepper button:disabled { cursor: default; }
.stepper .num {
  width: 24px; height: 24px; border-radius: 50%; flex: none; display: grid; place-items: center;
  border: 1px solid var(--axis); font-weight: 600; font-size: 12px; background: var(--surface);
}
.stepper li.done .num { background: var(--surface-2); color: var(--text-secondary); }
.stepper li.current button { color: var(--text-primary); font-weight: 600; }
.stepper li.current .num { background: var(--accent); border-color: var(--accent); color: #fff; }
@media (max-width: 720px) { .stepper .lbl { display: none; } .stepper button { justify-content: center; } }
.xp { height: 3px; border-radius: 99px; background: var(--grid); overflow: hidden; margin-bottom: 22px; }
.xp-fill { height: 100%; background: var(--accent); transition: width 0.3s ease; }

/* ------------------------------------------------------------ setup layout */
.setup-grid { display: grid; grid-template-columns: minmax(0, 1fr) 300px; gap: 20px; align-items: start; }
@media (max-width: 900px) { .setup-grid { grid-template-columns: minmax(0, 1fr); } }
.step-head { margin-bottom: 20px; }
.step-head h1 { margin-top: 6px; }
.step-title-row { display: flex; align-items: center; gap: 10px; }
.step-help { margin-left: auto; width: 34px; height: 34px; }
.step-card:not(.help-open) #step-body .hint { display: none; }
.step-ico { width: 34px; height: 34px; border-radius: 8px; background: var(--accent-wash); color: var(--accent); display: grid; place-items: center; }
.step-head p { color: var(--text-secondary); margin-top: 4px; }
.step-nav { display: flex; justify-content: space-between; margin-top: 26px; padding-top: 18px; border-top: 1px solid var(--grid); }
.step-nav .btn.calc { width: auto; margin-top: 0; }
#step-body { animation: fade-in 0.2s ease-out; }
@keyframes fade-in { from { opacity: 0; } to { opacity: 1; } }

.section-label { display: flex; align-items: center; gap: 8px; font-weight: 600; font-size: 13px; color: var(--text-secondary); margin: 22px 0 10px; text-transform: uppercase; letter-spacing: 0.04em; }
.section-label .ic { color: var(--accent); }
.section-label:first-child { margin-top: 0; }

/* option cards */
.choices { display: grid; grid-template-columns: repeat(auto-fill, minmax(190px, 1fr)); gap: 10px; }
.choices.wide { grid-template-columns: repeat(auto-fill, minmax(230px, 1fr)); }
.choice {
  position: relative; display: flex; flex-direction: column; align-items: flex-start; text-align: left; gap: 2px;
  padding: 14px 40px 14px 14px; border-radius: 8px; cursor: pointer;
  background: var(--surface); border: 1px solid var(--axis); transition: border-color 0.12s, background 0.12s;
}
.choice:hover { border-color: var(--text-muted); }
.choice[aria-pressed="true"] { border-color: var(--accent); background: var(--accent-wash); box-shadow: inset 0 0 0 1px var(--accent); }
.choice::after {
  content: ""; position: absolute; top: 14px; right: 14px; width: 16px; height: 16px; border-radius: 50%;
  border: 1px solid var(--axis); background: var(--surface);
}
.choice[aria-pressed="true"]::after { border: 5px solid var(--accent); }
.choice .ttl { font-weight: 600; font-size: 15px; }
.choice-ic { width: 44px; height: 44px; border-radius: 50%; display: grid; place-items: center; background: var(--surface-2); color: var(--text-secondary); margin-bottom: 8px; transition: background 0.15s, color 0.15s; }
.choice-ic .ic { width: 24px; height: 24px; }
.choice[aria-pressed="true"] .choice-ic { background: var(--accent); color: #fff; }
.choice.has-ic .tag { position: absolute; top: 12px; left: 64px; }
.choice .sub { font-size: 13px; color: var(--text-secondary); }
.choice .meta { font-size: 12px; color: var(--text-muted); margin-top: 4px; }
.choice .tag {
  display: inline-block; margin-bottom: 4px; font-size: 10px; font-weight: 600; letter-spacing: 0.06em;
  padding: 1px 6px; border-radius: 4px; background: var(--surface-2); color: var(--text-secondary); border: 1px solid var(--axis);
}

/* size step */
.size-hero { display: flex; align-items: baseline; gap: 10px; flex-wrap: wrap; }
.size-hero input {
  width: 180px; font-size: 30px; font-weight: 600; padding: 6px 10px; border-radius: 8px;
  border: 1px solid var(--axis); background: var(--surface); text-align: right; font-variant-numeric: tabular-nums;
}
.size-hero .unit { font-size: 16px; color: var(--text-secondary); }
input[type="range"] { width: 100%; accent-color: var(--accent); margin: 18px 0 8px; }
.presets { display: grid; grid-template-columns: repeat(4, 1fr); gap: 8px; }
.preset { padding: 8px 6px; border-radius: 8px; cursor: pointer; text-align: center; background: var(--surface); border: 1px solid var(--axis); }
.preset b { display: block; font-size: 13px; font-weight: 600; }
.preset span { font-size: 12px; color: var(--text-muted); font-variant-numeric: tabular-nums; }
.preset[aria-pressed="true"] { border-color: var(--accent); background: var(--accent-wash); box-shadow: inset 0 0 0 1px var(--accent); }

.scale { margin-top: 22px; }
.scale-title { display: flex; justify-content: space-between; align-items: center; gap: 12px; font-size: 13px; color: var(--text-secondary); margin-bottom: 8px; flex-wrap: wrap; }
.scale-track { position: relative; display: flex; height: 10px; border-radius: 5px; overflow: hidden; gap: 2px; }
.scale-track .z-small { background: rgba(12, 163, 12, 0.28); }
.scale-track .z-medium { background: rgba(250, 178, 25, 0.38); }
.scale-track .z-large { background: rgba(208, 59, 59, 0.30); }
.scale-wrap { position: relative; }
.scale-marker { position: absolute; top: -5px; width: 3px; height: 20px; border-radius: 2px; background: var(--text-primary); transform: translateX(-1px); transition: left 0.15s; }
.scale-labels { position: relative; height: 34px; font-size: 12px; color: var(--text-muted); }
.scale-labels span { position: absolute; top: 6px; transform: translateX(-50%); white-space: nowrap; text-align: center; line-height: 1.3; }
.scale-labels span:first-child { transform: none; }
.scale-labels span:last-child { transform: translateX(-100%); }
.badge {
  display: inline-flex; align-items: center; gap: 6px; font-size: 12px; font-weight: 600;
  padding: 2px 9px; border-radius: 999px; background: var(--surface-2); color: var(--text-secondary); border: 1px solid var(--border);
}
.badge .dot { width: 8px; height: 8px; border-radius: 50%; background: var(--text-muted); }
.badge[data-class="large"] .dot { background: var(--critical); }
.badge[data-class="medium"] .dot { background: var(--warning); }
.badge[data-class="small"] .dot { background: var(--good); }

/* boundary switches */
.toggles { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 10px; }
.toggle-card {
  display: flex; gap: 12px; align-items: center; text-align: left; padding: 12px 14px; border-radius: 8px; cursor: pointer;
  background: var(--surface); border: 1px solid var(--axis);
}
.toggle-card .ttl { font-weight: 600; display: block; font-size: 14px; }
.toggle-card .sub { font-size: 12px; color: var(--text-muted); }
.toggle-card .switch { margin-left: auto; flex: none; width: 36px; height: 20px; border-radius: 99px; background: var(--axis); position: relative; transition: background 0.15s; }
.toggle-card .switch::after { content: ""; position: absolute; top: 2px; left: 2px; width: 16px; height: 16px; border-radius: 50%; background: #fff; transition: transform 0.15s; }
.toggle-card[aria-pressed="true"] { border-color: var(--accent); }
.toggle-card[aria-pressed="true"] .switch { background: var(--accent); }
.toggle-card[aria-pressed="true"] .switch::after { transform: translateX(16px); }

select, input[type="number"] { padding: 7px 10px; border-radius: 8px; background: var(--surface); border: 1px solid var(--axis); }
.inline-field { display: flex; align-items: center; gap: 10px; margin-top: 14px; flex-wrap: wrap; font-size: 14px; }
.inline-field input { width: 120px; }

/* scenario summary */
.summary { position: sticky; top: 16px; }
.summary-list { margin: 12px 0 0; display: grid; grid-template-columns: auto 1fr; gap: 0; font-size: 14px; }
.summary-list dt, .summary-list dd { margin: 0; padding: 8px 0; border-bottom: 1px solid var(--grid); }
.summary-list dt { color: var(--text-muted); padding-right: 14px; font-size: 13px; display: flex; align-items: center; gap: 8px; }
.summary-list dt .ic { color: var(--accent); }
.summary-list dd { font-weight: 550; text-align: right; }
@media (max-width: 900px) { .summary { position: static; } }

/* ------------------------------------------------------------ loading */
.loading { min-height: 50vh; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 14px; text-align: center; }
.spinner { width: 34px; height: 34px; border-radius: 50%; border: 3px solid var(--grid); border-top-color: var(--accent); animation: spin 0.8s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }
.loader-msg { font-size: 15px; color: var(--text-secondary); }
.loader-bar { width: min(320px, 80vw); height: 4px; border-radius: 99px; background: var(--grid); overflow: hidden; }
.loader-bar div { height: 100%; width: 0; background: var(--accent); animation: fill 1.2s ease-in-out forwards; }
@keyframes fill { to { width: 100%; } }

/* ------------------------------------------------------------ results */
.result-head { display: flex; justify-content: space-between; align-items: flex-end; gap: 16px; flex-wrap: wrap; margin-bottom: 18px; }
.result-head h1 { margin-top: 4px; }
.result-actions { display: flex; gap: 8px; flex-wrap: wrap; }
.panel-actions .icon-btn { width: 34px; height: 34px; }
.panel-actions .icon-btn .ic { width: 18px; height: 18px; }
.chips { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 10px; }
@media (max-width: 560px) { .result-head > div:first-child { min-width: 0; flex: 1 1 100%; } .chips { flex-wrap: nowrap; overflow-x: auto; scrollbar-width: none; } .chip { white-space: nowrap; } }
.chip { font-size: 12px; padding: 3px 9px; border-radius: 6px; background: var(--surface); border: 1px solid var(--border); color: var(--text-secondary); }

.lenses { display: grid; grid-template-columns: repeat(4, 1fr); gap: 10px; margin-bottom: 16px; }
.lenses button {
  display: flex; flex-direction: column; align-items: center; gap: 6px; padding: 12px 6px 10px; cursor: pointer;
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); color: var(--text-secondary);
  box-shadow: var(--shadow); transition: border-color 0.12s, background 0.12s, transform 0.12s;
}
.lenses button:hover { color: var(--text-primary); transform: translateY(-1px); }
.lens-ic { width: 44px; height: 44px; border-radius: 50%; display: grid; place-items: center; background: var(--surface-2); color: var(--text-secondary); transition: background 0.15s, color 0.15s; }
.lens-ic .ic { width: 24px; height: 24px; }
.lenses button b { font-weight: 600; font-size: 14px; }
.lenses button[aria-selected="true"] { color: var(--text-primary); border-color: var(--accent); box-shadow: inset 0 0 0 1px var(--accent); }
.lenses button[aria-selected="true"] .lens-ic { background: var(--accent); color: #fff; }
@media (max-width: 560px) { .lenses { gap: 6px; } .lens-ic { width: 38px; height: 38px; } .lenses button b { font-size: 12px; } }

.kpis { display: grid; grid-template-columns: 1.6fr 1fr 1fr 1fr; gap: 12px; margin: 0 0 16px; }
@media (max-width: 760px) { .kpis { grid-template-columns: repeat(3, 1fr); } .kpi.hero { grid-column: 1 / -1; } }
.kpi { position: relative; background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); box-shadow: var(--shadow); animation: fade-in 0.3s ease-out both; }
.kpi .label { display: block; font-size: 13px; color: var(--text-secondary); }
.kpi .value { display: block; font-size: 24px; font-weight: 650; letter-spacing: -0.02em; font-variant-numeric: tabular-nums; color: var(--text-primary); line-height: 1.15; }
.kpi .unit { display: block; font-size: 12px; color: var(--text-muted); line-height: 1.35; }
.kpi-ic { width: 40px; height: 40px; border-radius: 50%; background: var(--accent-wash); color: var(--accent); display: grid; place-items: center; flex: none; }
.kpi-ic .ic { width: 22px; height: 22px; }
.kpi.hero { display: grid; grid-template-columns: auto minmax(0, 1fr); column-gap: 14px; align-items: center; padding: 16px 18px; border-left: 3px solid var(--accent); }
.kpi.hero .kpi-ic { grid-row: 1 / 4; width: 52px; height: 52px; }
.kpi.hero .kpi-ic .ic { width: 28px; height: 28px; }
.kpi.hero .value { font-size: 40px; }
.kpi.flip { padding: 0; min-height: 112px; background: none; border: none; box-shadow: none; }
.kpi.flip .flip-face { background: var(--surface); border: 1px solid var(--border); box-shadow: var(--shadow); }
.kpi.flip .back { border-color: var(--accent); box-shadow: inset 0 0 0 1px var(--accent); }
.kpi .back-lbl { font-size: 11.5px; color: var(--text-secondary); margin-bottom: 2px; }
.kpi.flip .front { gap: 8px; }
.kpi.flip .label { font-size: 12.5px; font-weight: 550; text-align: center; }
.kpi.flip .back { gap: 2px; }
@media (max-width: 760px) { .kpi.flip .value { font-size: 19px; } .kpi.flip .unit { font-size: 11px; } .kpi.hero .value { font-size: 32px; } }

/* flip cards: a face with an icon, turn it over to see the number */
.flip { display: block; width: 100%; padding: 0; border: none; background: none; cursor: pointer; perspective: 900px; text-align: center; color: inherit; }
.flip-in { display: grid; height: 100%; min-height: inherit; transition: transform 0.5s cubic-bezier(.4, 0, .2, 1); transform-style: preserve-3d; }
.flip-face {
  grid-area: 1 / 1; display: flex; flex-direction: column; align-items: center; justify-content: center; padding: 14px 12px;
  border-radius: var(--radius); backface-visibility: hidden; -webkit-backface-visibility: hidden;
}
.flip-face.back { transform: rotateY(180deg); }
.flip[aria-pressed="true"] .flip-in { transform: rotateY(180deg); }
.flip:hover .flip-face.front .kpi-ic, .flip:hover .why-ico { transform: scale(1.08); }
.kpi-ic, .why-ico { transition: transform 0.15s; }
.flip-hint { font-size: 11px; font-weight: 600; letter-spacing: 0.06em; text-transform: uppercase; color: var(--text-muted); margin-top: 6px; }
.kpi.flip .front::after { content: ""; position: absolute; top: 9px; right: 9px; width: 7px; height: 7px; border-radius: 50%; background: var(--accent); opacity: 0.55; }

/* round icon-only buttons */
.icon-btn {
  width: 38px; height: 38px; flex: none; display: inline-grid; place-items: center; border-radius: 50%; cursor: pointer;
  background: var(--surface); border: 1px solid var(--axis); color: var(--text-secondary); transition: background 0.12s, color 0.12s, border-color 0.12s;
}
.icon-btn:hover { background: var(--surface-2); color: var(--text-primary); }
.icon-btn[aria-pressed="true"] { background: var(--accent); border-color: var(--accent); color: #fff; }
.icon-btn:disabled { opacity: 0.4; cursor: default; }
.icon-btn.on-dark { background: rgba(255, 255, 255, 0.06); border-color: rgba(255, 255, 255, 0.16); color: var(--on-dark-muted); }
.icon-btn.on-dark:hover { background: rgba(255, 255, 255, 0.12); color: var(--on-dark); }

/* data dock under the diagram */
.dock { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 12px; margin-top: 16px; }
.dock-btn {
  display: flex; flex-direction: column; align-items: center; gap: 8px; padding: 18px 10px 14px; cursor: pointer; text-align: center;
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); box-shadow: var(--shadow); transition: border-color 0.12s, transform 0.12s;
}
.dock-btn:hover { border-color: var(--accent); transform: translateY(-2px); }
.dock-ic { width: 52px; height: 52px; border-radius: 50%; display: grid; place-items: center; background: var(--accent-wash); color: var(--accent); }
.dock-ic .ic { width: 26px; height: 26px; }
.dock-btn b { font-size: 14px; font-weight: 600; }
.dock-btn small { font-size: 12px; color: var(--text-muted); margin-top: -4px; }
@media (max-width: 560px) { .dock { grid-template-columns: repeat(3, 1fr); gap: 8px; } .dock-btn { padding: 14px 4px 10px; } .dock-ic { width: 44px; height: 44px; } .dock-btn b { font-size: 12px; } .dock-btn small { display: none; } }

/* data sheet (dialog): side drawer on wide screens, full sheet on phones */
.sheet {
  margin: 0 0 0 auto; padding: 0; border: none; width: min(760px, 100vw); max-width: 100vw; height: 100dvh; max-height: 100dvh;
  background: var(--surface); color: var(--text-primary); box-shadow: -8px 0 32px rgba(0, 0, 0, 0.18);
}
.sheet[open] { animation: sheet-in 0.25s cubic-bezier(.2, .8, .2, 1); }
.sheet::backdrop { background: rgba(5, 12, 10, 0.45); }
@keyframes sheet-in { from { transform: translateX(40px); opacity: 0; } }
.sheet-inner { display: flex; flex-direction: column; height: 100%; }
.sheet-head { display: flex; align-items: center; gap: 12px; padding: 16px 20px; border-bottom: 1px solid var(--grid); }
.sheet-head h2 { flex: 1; font-size: 18px; }
.sheet-ico { width: 38px; height: 38px; border-radius: 50%; background: var(--accent-wash); color: var(--accent); display: grid; place-items: center; flex: none; }
.sheet-body { flex: 1; overflow-y: auto; padding: 18px 20px 32px; }
.sheet #detail .card { padding: 0; border: none; box-shadow: none; background: none; margin: 0; }
.sheet #detail .panel-head h2 { display: none; }
.sheet .intro-notes { margin: 0; padding: 0; border: none; }
@media (max-width: 640px) {
  .sheet { width: 100vw; }
  .sheet[open] { animation-name: sheet-up; }
  @keyframes sheet-up { from { transform: translateY(40px); opacity: 0; } }
  .sheet-head { padding: 12px 16px; }
  .sheet-body { padding: 14px 16px 28px; }
}
.flash { animation: flash 1.6s ease-out; border-radius: 4px; }
@keyframes flash { 0%, 40% { background: var(--accent-wash); box-shadow: 0 0 0 4px var(--accent-wash); } }

.flow-note { margin-top: 12px; padding: 10px 12px; border-radius: 8px; background: var(--surface-2); }

.warning-item { display: flex; gap: 8px; align-items: flex-start; padding: 10px 14px; border-radius: 8px; background: var(--surface); border: 1px solid var(--border); font-size: 14px; margin-bottom: 12px; }
.warning-item::before { content: "!"; font-weight: 700; color: #0b0b0b; background: var(--warning); border-radius: 50%; width: 18px; height: 18px; flex: none; display: grid; place-items: center; font-size: 12px; }

/* emission bars */
.stack { display: flex; height: 24px; gap: 2px; margin: 4px 0 18px; }
.stack .seg { height: 100%; min-width: 0; }
.stack .seg:first-child { border-radius: 4px 0 0 4px; }
.stack .seg:last-child { border-radius: 0 4px 4px 0; }
.bars { display: grid; grid-template-columns: minmax(150px, 240px) minmax(0, 1fr) 100px 52px; align-items: center; row-gap: 8px; column-gap: 12px; }
.bars .name { display: flex; align-items: center; gap: 8px; font-size: 14px; }
.bars .name .sw { width: 10px; height: 10px; border-radius: 3px; flex: none; }
.bars .name .scope { color: var(--text-muted); font-size: 11px; margin-left: auto; white-space: nowrap; }
.bars .track { height: 16px; border-left: 1px solid var(--axis); }
.bars .bar { height: 16px; border-radius: 0 4px 4px 0; transform-origin: left; animation: grow 0.5s ease-out both; }
@keyframes grow { from { transform: scaleX(0); } to { transform: scaleX(1); } }
.bars .val { text-align: right; font-variant-numeric: tabular-nums; font-size: 14px; font-weight: 550; }
.bars .pct { text-align: right; font-variant-numeric: tabular-nums; font-size: 12px; color: var(--text-muted); }
.bars .excluded { color: var(--text-muted); font-style: italic; font-size: 12px; }
@media (max-width: 640px) {
  .bars { grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr) 64px 44px; column-gap: 8px; }
  .bars .name { font-size: 12px; }
  .bars .name .scope { display: none; }
}
.fact-row { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 16px; padding-top: 14px; border-top: 1px solid var(--grid); }
.fact { flex: 1 1 180px; padding: 10px 12px; border-radius: 8px; background: var(--surface-2); font-size: 13px; color: var(--text-secondary); }
.fact strong { display: block; font-size: 18px; font-weight: 650; color: var(--text-primary); font-variant-numeric: tabular-nums; }

/* sankey */
.sankey-wrap { overflow-x: auto; }
.sankey-wrap svg { display: block; width: 100%; height: auto; }
.sankey-wrap .link { opacity: var(--link-opacity); transition: opacity 0.12s; }
.sankey-wrap .link:hover { opacity: 0.85; }
.sankey-wrap .node rect { fill: var(--text-secondary); }
.sankey-wrap text { font: 500 12px var(--font); fill: var(--text-primary); paint-order: stroke; stroke: var(--surface); stroke-width: 4px; stroke-linejoin: round; }
.sankey-wrap text.v { fill: var(--text-muted); font-weight: 400; font-size: 11px; }
.sankey-anim .links { animation: reveal 1.2s cubic-bezier(.4, 0, .2, 1) both; }
.sankey-anim .node { animation: fade-in 0.4s ease-out both; animation-delay: calc(var(--col) * 0.25s); }
@keyframes reveal { from { clip-path: inset(0 100% 0 0); } to { clip-path: inset(0 0 0 0); } }

/* tables */
.table-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
@media (max-width: 900px) { .table-grid { grid-template-columns: 1fr; } }
table { width: 100%; border-collapse: collapse; font-size: 14px; }
th, td { padding: 7px 8px; text-align: left; border-bottom: 1px solid var(--grid); vertical-align: top; }
th { font-weight: 600; color: var(--text-secondary); font-size: 12px; }
td.num, th.num { text-align: right; font-variant-numeric: tabular-nums; white-space: nowrap; }
td.u { color: var(--text-muted); white-space: nowrap; }
tr.sub td:first-child { padding-left: 22px; color: var(--text-secondary); }

/* advanced settings & methods */
details.assume > summary { cursor: pointer; font-weight: 600; font-size: 16px; list-style: none; display: flex; justify-content: space-between; align-items: baseline; gap: 12px; }
details.assume > summary::-webkit-details-marker { display: none; }
details.assume > summary > span { display: inline-flex; align-items: center; gap: 6px; }
details.assume > summary > span .ic { color: var(--accent); }
details.assume > summary > span::before { content: "▸"; display: inline-block; width: 16px; color: var(--text-muted); transition: transform 0.15s; }
details.assume[open] > summary > span::before { transform: rotate(90deg); }
details.assume > summary small { font-size: 12px; font-weight: 400; color: var(--text-muted); text-align: right; }
.assume-table input { width: 110px; padding: 4px 6px; text-align: right; font-variant-numeric: tabular-nums; }
.assume-table tr.modified input { border-color: var(--accent); background: var(--accent-wash); }
.assume-table td.src { color: var(--text-muted); font-size: 12px; min-width: 280px; }
.assume-table .group-head td { font-weight: 600; color: var(--text-primary); background: var(--surface-2); border-bottom: none; }
.table-scroll { overflow-x: auto; }
.methods { font-size: 14px; color: var(--text-secondary); }
.methods h3 { margin: 18px 0 4px; color: var(--text-primary); }
.methods p { margin-top: 8px; line-height: 1.8; }

/* ------------------------------------------------------------ intro */
.card.hero { position: relative; padding: 36px 28px 32px; text-align: center; background: var(--ink-dark); color: var(--on-dark); border-color: rgba(255, 255, 255, 0.06); }
.card.hero .step-kicker { color: var(--amber); }
.hero-info { position: absolute; top: 16px; right: 16px; }
.live-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--critical); box-shadow: 0 0 0 0 rgba(208, 59, 59, 0.6); animation: pulse 1.6s ease-out infinite; }
@keyframes pulse { to { box-shadow: 0 0 0 10px rgba(208, 59, 59, 0); } }
.clock { margin: 18px auto 0; max-width: 720px; color: var(--on-dark); }
.clock-value { font-size: clamp(44px, 11vw, 96px); font-weight: 700; line-height: 1.05; font-variant-numeric: tabular-nums; letter-spacing: -0.03em; color: #ffffff; }
.clock-unit { font-size: 15px; color: var(--on-dark-muted); margin-top: 6px; }
.hero-rate { margin-top: 10px; font-size: 17px; color: var(--on-dark); }
.hero-rate .hl { color: var(--amber); font-weight: 700; font-variant-numeric: tabular-nums; }
.flip-row { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; max-width: 640px; margin: 26px auto 0; }
.clock-facts .flip { min-height: 96px; }
.clock-facts .flip-face { background: rgba(255, 255, 255, 0.06); border: 1px solid rgba(255, 255, 255, 0.08); color: var(--on-dark-muted); gap: 6px; font-size: 13px; font-weight: 550; }
.clock-facts .flip-face .ic { width: 26px; height: 26px; color: var(--amber); }
.clock-facts .back strong { font-size: 22px; color: var(--on-dark); font-variant-numeric: tabular-nums; line-height: 1.1; }
.clock-facts .back small { font-size: 11.5px; font-weight: 400; }
.btn.hero-cta { width: auto; padding: 14px 34px; margin-top: 28px; font-size: 17px; border-radius: 999px; }
.card.hero a.cite { color: #7fd8b0; }
@media (max-width: 560px) { .card.hero { padding: 52px 14px 24px; } .hero-info { top: 10px; right: 10px; width: 34px; height: 34px; } .flip-row { gap: 8px; } .clock-facts .flip-face { padding: 10px 6px; font-size: 12px; } .clock-facts .back strong { font-size: 17px; } }

.intro-h { margin: 36px 0 14px; font-size: 20px; text-align: center; }
.intro-h small { display: block; font-size: 12px; font-weight: 600; letter-spacing: 0.08em; text-transform: uppercase; color: var(--text-muted); margin-top: 2px; }
.path { list-style: none; padding: 0; margin: 0; display: grid; grid-template-columns: repeat(4, 1fr); gap: 0; }
.path li { position: relative; display: flex; flex-direction: column; align-items: center; gap: 10px; text-align: center; }
.path li + li::before { content: ""; position: absolute; top: 32px; right: calc(50% + 40px); width: calc(100% - 80px); border-top: 2px dashed var(--axis); }
.path-ico { width: 64px; height: 64px; border-radius: 50%; display: grid; place-items: center; background: var(--surface); color: var(--accent); border: 2px solid var(--accent); box-shadow: var(--shadow); }
.path-ico .ic { width: 30px; height: 30px; }
.path b { font-size: 14px; font-weight: 600; }
@media (max-width: 560px) { .path-ico { width: 52px; height: 52px; } .path-ico .ic { width: 24px; height: 24px; } .path li + li::before { top: 26px; right: calc(50% + 32px); width: calc(100% - 64px); } .path b { font-size: 12px; } }

.why-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; }
@media (max-width: 900px) { .why-grid { grid-template-columns: repeat(2, 1fr); } }
.flip.why { min-height: 210px; }
.why .flip-face { background: var(--surface); border: 1px solid var(--border); box-shadow: var(--shadow); padding: 18px 14px; gap: 6px; }
.why .back { background: var(--accent-wash); border-color: var(--accent); }
.why-ico { width: 64px; height: 64px; border-radius: 50%; background: var(--accent-wash); color: var(--accent); display: grid; place-items: center; flex: none; margin-bottom: 6px; }
.why-ico .ic { width: 32px; height: 32px; }
.why h3 { color: var(--text-primary); font-size: 15px; margin: 0; }
.why-stat { font-size: 30px; font-weight: 700; color: var(--accent); letter-spacing: -0.02em; font-variant-numeric: tabular-nums; }
.why-text { font-size: 13.5px; color: var(--text-secondary); line-height: 1.45; }
@media (max-width: 560px) { .why-grid { gap: 10px; } .flip.why { min-height: 190px; } .why-ico { width: 52px; height: 52px; } .why-stat { font-size: 24px; } .why-text { font-size: 12.5px; } }

.intro-notes { font-size: 14px; color: var(--text-secondary); line-height: 1.6; }
.intro-notes p + p { margin-top: 10px; }
.intro-notes b { color: var(--text-primary); }
.notes-h { font-size: 12px; font-weight: 700; letter-spacing: 0.1em; text-transform: uppercase; color: var(--text-muted); margin: 18px 0 4px; }
.intro-refs { margin: 6px 0 0; font-size: 12.5px; color: var(--text-muted); padding-left: 0; list-style: none; }
.intro-refs li { margin-bottom: 6px; }

.fn-mark { font-size: 0.6em; vertical-align: super; line-height: 0; margin-left: 1px; }
.footnote { font-size: 12.5px; color: var(--text-muted); margin-top: 14px; padding-top: 10px; border-top: 1px solid var(--grid); line-height: 1.55; }
.footnote b { color: var(--text-secondary); }
.card.hero .footnote { max-width: 720px; margin: 14px auto 0; text-align: left; color: var(--on-dark-muted); border-top-color: rgba(255, 255, 255, 0.1); }
.card.hero .footnote b { color: var(--on-dark); }

.panel-actions { display: flex; gap: 6px; flex-wrap: wrap; align-items: center; }
.phone-only { display: none !important; }
body.is-phone .phone-only { display: inline-flex !important; }
body.is-phone .desktop-only { display: none !important; }

/* compact Sankey (phones): numbered markers + legend */
.sankey-wrap svg[data-compact] { min-width: 0; }
.sankey-wrap text.num { font-weight: 700; font-size: 11px; fill: var(--text-primary); }
.sankey-legend { list-style: none; margin: 12px 0 0; padding: 0; display: grid; gap: 2px; font-size: 13px; }
.sankey-legend li { display: grid; grid-template-columns: 22px 12px minmax(0, 1fr) auto; align-items: center; gap: 8px; padding: 5px 2px; border-bottom: 1px solid var(--grid); }
.sankey-legend .lg-num { font-weight: 700; color: var(--text-secondary); text-align: right; font-variant-numeric: tabular-nums; }
.sankey-legend .lg-sw { width: 12px; height: 12px; border-radius: 3px; }
.sankey-legend .lg-name { color: var(--text-primary); overflow-wrap: anywhere; }
.sankey-legend .lg-val { color: var(--text-muted); font-variant-numeric: tabular-nums; white-space: nowrap; font-size: 12px; }

/* ------------------------------------------------------------ footer */
.site-footer { background: var(--ink-dark); color: var(--on-dark-muted); font-size: 13px; }
.footer-inner { max-width: 1180px; margin: 0 auto; padding: 18px 24px; display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap; }
.footer-inner b { color: var(--on-dark); font-weight: 600; }
.footer-inner a { color: var(--amber); text-decoration: none; display: inline-flex; align-items: center; gap: 4px; }
.footer-inner a:hover { text-decoration: underline; }

/* sources & citations */
a.cite { color: var(--accent); font-weight: 600; text-decoration: none; font-size: 0.85em; margin-left: 1px; white-space: nowrap; }
a.cite:hover { text-decoration: underline; }
.basis { display: inline-block; font-size: 11px; font-weight: 600; padding: 1px 7px; border-radius: 4px; white-space: nowrap; border: 1px solid transparent; }
.basis.b-taken { background: rgba(12, 163, 12, 0.10); color: var(--text-primary); border-color: rgba(12, 163, 12, 0.40); }
.basis.b-approx { background: rgba(42, 120, 214, 0.10); color: var(--text-primary); border-color: rgba(42, 120, 214, 0.40); }
.basis.b-assumed { background: rgba(250, 178, 25, 0.14); color: var(--text-primary); border-color: rgba(201, 133, 0, 0.45); }
.src-note { color: var(--text-muted); }
.src-table { margin-top: 6px; }
.src-table td { font-size: 13px; }
.nowrap { white-space: nowrap; }
.muted { color: var(--text-muted); }
.ref-list { padding-left: 24px; margin: 6px 0 0; font-size: 13px; }
.ref-list li { margin-bottom: 6px; scroll-margin-top: 80px; }
.ref-list li:target { background: var(--accent-wash); border-radius: 4px; }
.ref-list a, .intro-refs a { color: var(--accent); word-break: break-all; }

/* tooltip */
.tooltip {
  position: fixed; left: 0; top: 0; pointer-events: none; z-index: 50; max-width: 280px;
  background: var(--surface); color: var(--text-primary); border: 1px solid var(--border);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.14); border-radius: 8px; padding: 8px 10px; font-size: 13px;
  opacity: 0; transition: opacity 0.08s;
}
.tooltip.show { opacity: 1; }
.tooltip .t-title { font-weight: 600; margin-bottom: 2px; }
.tooltip .t-val { font-variant-numeric: tabular-nums; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.01ms !important; animation-delay: 0s !important; transition: none !important; }
}
@media print {
  .topbar, .site-footer, .result-actions, .lenses, .panel-actions, .dock, .sheet { display: none !important; }
  .card, .kpi { box-shadow: none; }
}