:root {
  color-scheme: light;
  --canvas: #f4f5ef;
  --canvas-deep: #e9ede4;
  --surface: rgba(255,255,252,.88);
  --surface-solid: #fffefb;
  --surface-muted: #eef1ea;
  --ink: #18221e;
  --ink-soft: #56645d;
  --ink-faint: #748079;
  --line: rgba(24,34,30,.12);
  --line-strong: rgba(24,34,30,.22);
  --accent: #205c49;
  --accent-hover: #174838;
  --accent-soft: #dcebe2;
  --accent-ink: #f6fff9;
  --warm: #e9d8bd;
  --danger: #a53e35;
  --danger-soft: #f8e9e6;
  --shadow-sm: 0 1px 2px rgba(20,30,25,.05), 0 5px 18px rgba(20,30,25,.05);
  --shadow-lg: 0 22px 70px rgba(20,30,25,.11);
  --radius-sm: 12px;
  --radius: 20px;
  --radius-lg: 30px;
  --focus: 0 0 0 3px rgba(32,92,73,.22);
  --font: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}
html[data-theme="dark"] {
  color-scheme: dark;
  --canvas: #111713;
  --canvas-deep: #17201b;
  --surface: rgba(27,36,31,.9);
  --surface-solid: #1b241f;
  --surface-muted: #202c25;
  --ink: #edf4ef;
  --ink-soft: #b2beb7;
  --ink-faint: #8e9b94;
  --line: rgba(237,244,239,.11);
  --line-strong: rgba(237,244,239,.2);
  --accent: #88c7ad;
  --accent-hover: #a4d8c2;
  --accent-soft: #233d32;
  --accent-ink: #10241c;
  --warm: #433927;
  --danger: #ff9589;
  --danger-soft: #412925;
  --shadow-sm: 0 1px 2px rgba(0,0,0,.22), 0 8px 20px rgba(0,0,0,.12);
  --shadow-lg: 0 28px 80px rgba(0,0,0,.32);
  --focus: 0 0 0 3px rgba(136,199,173,.25);
}
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  min-width: 320px;
  background:
    radial-gradient(circle at 7% 4%, rgba(144,190,163,.20), transparent 27rem),
    radial-gradient(circle at 91% 15%, rgba(233,216,189,.40), transparent 30rem),
    var(--canvas);
  color: var(--ink);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
button, input, select { font: inherit; }
button, a, input, select, summary { -webkit-tap-highlight-color: transparent; }
button { color: inherit; }
a { color: var(--accent); text-underline-offset: .18em; }
[hidden] { display: none !important; }
.skip-link {
  position: fixed; left: 16px; top: 12px; z-index: 20;
  transform: translateY(-150%); padding: 10px 14px; border-radius: 10px;
  background: var(--ink); color: var(--canvas); font-weight: 700; text-decoration: none;
}
.skip-link:focus { transform: translateY(0); }
.shell { width: min(1180px, calc(100% - 32px)); margin: 0 auto; padding: 22px 0 80px; }
.topbar { display: flex; align-items: center; justify-content: space-between; gap: 16px; }
.brand { display: inline-flex; align-items: center; gap: 10px; color: var(--ink); font-weight: 760; letter-spacing: -.02em; text-decoration: none; }
.brand-mark { width: 34px; height: 34px; display: grid; place-items: center; border-radius: 11px; background: var(--accent); color: var(--accent-ink); box-shadow: var(--shadow-sm); }
.top-actions { display: flex; align-items: center; gap: 8px; }
.quiet-link { display: none; color: var(--ink-soft); font-size: .88rem; font-weight: 650; text-decoration: none; padding: 8px; }
.quiet-link:hover { color: var(--ink); }
.icon-button { width: 42px; height: 42px; display: inline-grid; place-items: center; border: 1px solid var(--line); border-radius: 13px; background: var(--surface); cursor: pointer; box-shadow: var(--shadow-sm); transition: transform .16s ease, border-color .16s ease, background .16s ease; }
.icon-button:hover { border-color: var(--line-strong); background: var(--surface-solid); }
.icon-button:active { transform: scale(.95); }
.icon-button svg { width: 19px; height: 19px; }
.hero { padding: clamp(58px, 9vw, 105px) 0 clamp(34px, 5vw, 56px); max-width: 850px; }
.eyebrow { display: inline-flex; align-items: center; gap: 8px; color: var(--accent); font-size: .77rem; font-weight: 800; letter-spacing: .13em; text-transform: uppercase; }
.eyebrow::before { content: ""; width: 22px; height: 1px; background: currentColor; }
h1 { margin: 16px 0 18px; max-width: 830px; font-size: clamp(2.55rem, 7vw, 5.6rem); line-height: .97; letter-spacing: -.062em; font-weight: 730; }
.hero p { margin: 0; max-width: 675px; color: var(--ink-soft); font-size: clamp(1.02rem, 2vw, 1.24rem); }
.trust-row { display: flex; flex-wrap: wrap; gap: 8px 18px; margin-top: 24px; color: var(--ink-faint); font-size: .86rem; }
.trust-item { display: inline-flex; align-items: center; gap: 7px; }
.trust-dot { width: 6px; height: 6px; border-radius: 50%; background: var(--accent); }
.calculator-grid { display: grid; grid-template-columns: minmax(0, 1.06fr) minmax(340px, .94fr); gap: 24px; align-items: start; }
.card { border: 1px solid var(--line); border-radius: var(--radius-lg); background: var(--surface); backdrop-filter: blur(18px); -webkit-backdrop-filter: blur(18px); box-shadow: var(--shadow-lg); overflow: clip; }
.form-card { padding: clamp(22px, 4vw, 38px); }
.result-card { position: sticky; top: 20px; }
.card-heading { display: flex; align-items: flex-start; justify-content: space-between; gap: 16px; margin-bottom: 28px; }
.step { color: var(--accent); font-size: .72rem; font-weight: 850; letter-spacing: .12em; text-transform: uppercase; }
h2 { margin: 5px 0 0; font-size: clamp(1.35rem, 3vw, 1.8rem); line-height: 1.15; letter-spacing: -.035em; }
.private-pill { flex: none; display: inline-flex; align-items: center; gap: 6px; padding: 7px 10px; border-radius: 999px; background: var(--accent-soft); color: var(--accent); font-size: .73rem; font-weight: 750; }
.field-group { margin-top: 25px; }
.field-label { display: flex; justify-content: space-between; align-items: baseline; gap: 12px; margin-bottom: 10px; font-size: .89rem; font-weight: 720; }
.field-hint { color: var(--ink-faint); font-size: .78rem; font-weight: 500; }
.field-value { color: var(--accent); font-size: 1rem; font-variant-numeric: tabular-nums; }
.segmented { display: grid; gap: 7px; padding: 6px; border: 1px solid var(--line); border-radius: 16px; background: var(--surface-muted); }
.segmented.two { grid-template-columns: repeat(2, 1fr); }
.segmented.three { grid-template-columns: repeat(3, 1fr); }
.segment { min-height: 48px; padding: 9px 10px; border: 0; border-radius: 11px; background: transparent; color: var(--ink-soft); font-size: .86rem; font-weight: 720; cursor: pointer; transition: transform .14s ease, color .16s ease, background .16s ease, box-shadow .16s ease; }
.segment:hover { color: var(--ink); }
.segment[aria-selected="true"] { background: var(--surface-solid); color: var(--ink); box-shadow: var(--shadow-sm); }
.segment:active { transform: scale(.975); }
.segment strong, .segment span { display: block; }
.segment span { margin-top: 2px; color: var(--ink-faint); font-size: .69rem; font-weight: 560; }
.segment[aria-selected="true"] span { color: var(--ink-soft); }
.range-wrap { padding: 14px 0 4px; }
input[type="range"] { width: 100%; height: 32px; margin: 0; background: transparent; cursor: pointer; accent-color: var(--accent); }
input[type="range"]::-webkit-slider-runnable-track { height: 7px; border-radius: 999px; background: linear-gradient(90deg, var(--accent-soft), var(--surface-muted)); }
input[type="range"]::-webkit-slider-thumb { width: 25px; height: 25px; margin-top: -9px; border: 5px solid var(--surface-solid); border-radius: 50%; background: var(--accent); box-shadow: 0 2px 8px rgba(0,0,0,.18); -webkit-appearance: none; }
input[type="range"]::-moz-range-track { height: 7px; border-radius: 999px; background: var(--surface-muted); }
input[type="range"]::-moz-range-progress { height: 7px; border-radius: 999px; background: var(--accent); }
input[type="range"]::-moz-range-thumb { width: 16px; height: 16px; border: 5px solid var(--surface-solid); border-radius: 50%; background: var(--accent); box-shadow: 0 2px 8px rgba(0,0,0,.18); }
.range-scale { display: flex; justify-content: space-between; color: var(--ink-faint); font-size: .7rem; }
.select-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
select, input[type="number"] { width: 100%; min-height: 50px; padding: 0 14px; border: 1px solid var(--line-strong); border-radius: 13px; background: var(--surface-solid); color: var(--ink); outline: none; transition: border-color .16s ease, box-shadow .16s ease; }
select:hover, input[type="number"]:hover { border-color: var(--accent); }
select:focus-visible, input[type="number"]:focus-visible { border-color: var(--accent); box-shadow: var(--focus); }
input[aria-invalid="true"] { border-color: var(--danger); box-shadow: 0 0 0 3px color-mix(in srgb, var(--danger) 20%, transparent); }
.cohort-box { margin-top: 18px; padding: 18px; border: 1px solid var(--line); border-radius: 17px; background: var(--accent-soft); }
.cohort-box .field-group { margin-top: 0; }
.cohort-note { margin: 9px 0 0; color: var(--ink-soft); font-size: .76rem; }
.inline-error { min-height: 1.35em; margin: 7px 0 0; color: var(--danger); font-size: .78rem; font-weight: 620; }
.form-actions { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 30px; padding-top: 24px; border-top: 1px solid var(--line); }
.button { min-height: 46px; display: inline-flex; align-items: center; justify-content: center; gap: 8px; padding: 0 17px; border: 1px solid transparent; border-radius: 13px; font-weight: 750; font-size: .86rem; text-decoration: none; cursor: pointer; transition: transform .14s ease, background .16s ease, border-color .16s ease, opacity .16s ease; }
.button:active { transform: scale(.97); }
.button.primary { background: var(--accent); color: var(--accent-ink); }
.button.primary:hover { background: var(--accent-hover); }
.button.secondary { border-color: var(--line-strong); background: var(--surface-solid); color: var(--ink); }
.button.secondary:hover { border-color: var(--accent); }
.button.ghost { background: transparent; color: var(--ink-soft); }
.button.ghost:hover { color: var(--ink); background: var(--surface-muted); }
.button svg { width: 17px; height: 17px; }
.error-banner { display: flex; align-items: flex-start; gap: 10px; margin-bottom: 18px; padding: 13px 14px; border: 1px solid color-mix(in srgb, var(--danger) 30%, transparent); border-radius: 13px; background: var(--danger-soft); color: var(--danger); font-size: .84rem; font-weight: 650; }
.shake { animation: shake .32s ease; }
@keyframes shake { 20%, 60% { transform: translateX(-4px); } 40%, 80% { transform: translateX(4px); } }
.result-top { padding: clamp(24px, 4vw, 38px); background: linear-gradient(150deg, var(--surface-solid), var(--accent-soft)); border-bottom: 1px solid var(--line); }
.result-kicker { color: var(--accent); font-size: .74rem; font-weight: 820; letter-spacing: .1em; text-transform: uppercase; }
.energy-range { margin: 12px 0 8px; font-size: clamp(2.35rem, 5vw, 4.15rem); line-height: .98; letter-spacing: -.064em; font-weight: 740; font-variant-numeric: tabular-nums; overflow-wrap: anywhere; }
.comparison { margin: 0; max-width: 520px; color: var(--ink-soft); font-size: 1rem; }
.confidence-row { display: flex; align-items: center; flex-wrap: wrap; gap: 9px; margin-top: 20px; }
.confidence-badge { display: inline-flex; align-items: center; gap: 7px; padding: 7px 10px; border-radius: 999px; background: var(--surface); border: 1px solid var(--line); color: var(--ink-soft); font-size: .75rem; font-weight: 730; }
.confidence-dot { width: 7px; height: 7px; border-radius: 50%; background: #d6a84e; box-shadow: 0 0 0 4px rgba(214,168,78,.14); }
.method-version { color: var(--ink-faint); font-size: .72rem; }
.result-body { padding: clamp(22px, 4vw, 34px); }
.summary-line { margin: 0 0 21px; color: var(--ink-soft); font-size: .85rem; }
.comparison-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 9px; }
.comparison-tile { min-width: 0; padding: 14px 12px; border: 1px solid var(--line); border-radius: 14px; background: var(--surface-muted); }
.comparison-icon { color: var(--accent); font-size: 1.08rem; }
.comparison-number { display: block; margin-top: 8px; font-size: 1.12rem; line-height: 1; font-weight: 780; font-variant-numeric: tabular-nums; }
.comparison-label { display: block; margin-top: 5px; color: var(--ink-faint); font-size: .69rem; line-height: 1.25; }
.water-panel { margin-top: 18px; padding: 17px; border: 1px solid var(--line); border-radius: 16px; background: var(--surface-solid); }
.water-heading { display: flex; align-items: center; justify-content: space-between; gap: 12px; font-size: .83rem; font-weight: 750; }
.rough-tag { padding: 4px 7px; border-radius: 999px; background: var(--warm); color: var(--ink-soft); font-size: .62rem; letter-spacing: .07em; text-transform: uppercase; }
.water-value { margin-top: 8px; font-size: 1.4rem; font-weight: 760; font-variant-numeric: tabular-nums; }
.water-note { margin: 7px 0 0; color: var(--ink-faint); font-size: .74rem; }
details { margin-top: 17px; border-top: 1px solid var(--line); padding-top: 16px; }
summary { cursor: pointer; list-style: none; color: var(--accent); font-size: .82rem; font-weight: 720; }
summary::-webkit-details-marker { display: none; }
summary::after { content: "+"; float: right; font-size: 1.1rem; line-height: 1; }
details[open] summary::after { content: "−"; }
.reasons { display: grid; gap: 9px; margin-top: 14px; }
.reason { display: flex; gap: 9px; color: var(--ink-soft); font-size: .77rem; }
.reason-mark { color: var(--accent); font-weight: 800; }
.history-section { margin-top: 24px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); box-shadow: var(--shadow-sm); overflow: hidden; }
.history-header { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding: 18px 20px; border-bottom: 1px solid var(--line); }
.history-title { margin: 0; font-size: 1rem; letter-spacing: -.02em; }
.text-button { padding: 7px 9px; border: 0; border-radius: 9px; background: transparent; color: var(--ink-faint); font-size: .75rem; font-weight: 700; cursor: pointer; }
.text-button:hover { color: var(--danger); background: var(--danger-soft); }
.history-tape { display: flex; gap: 10px; overflow-x: auto; padding: 14px 18px 18px; scroll-snap-type: x proximity; scrollbar-width: thin; }
.history-empty { width: 100%; margin: 0; padding: 7px 2px; color: var(--ink-faint); font-size: .82rem; }
.history-item { min-width: min(290px, 82vw); scroll-snap-align: start; padding: 14px; border: 1px solid var(--line); border-radius: 14px; background: var(--surface-solid); }
.history-meta { display: flex; justify-content: space-between; gap: 10px; color: var(--ink-faint); font-size: .67rem; }
.history-energy { margin-top: 8px; font-size: 1.05rem; font-weight: 780; font-variant-numeric: tabular-nums; }
.history-description { margin: 4px 0 10px; color: var(--ink-soft); font-size: .72rem; }
.history-actions { display: flex; gap: 7px; }
.history-actions button { min-height: 34px; padding: 0 10px; border: 1px solid var(--line); border-radius: 9px; background: var(--surface-muted); color: var(--ink-soft); font-size: .7rem; font-weight: 700; cursor: pointer; }
.history-actions button:hover { color: var(--ink); border-color: var(--accent); }
.cta { margin-top: 26px; display: flex; align-items: center; justify-content: space-between; gap: 25px; flex-wrap: wrap; padding: clamp(24px, 5vw, 38px); border-radius: var(--radius-lg); background: #18241f; color: #eef5f0; box-shadow: var(--shadow-lg); }
html[data-theme="dark"] .cta { background: #e7eee9; color: #17221d; }
.cta h3 { margin: 0 0 6px; font-size: clamp(1.25rem, 3vw, 1.7rem); letter-spacing: -.035em; }
.cta p { margin: 0; max-width: 590px; color: #adbcb4; font-size: .88rem; }
html[data-theme="dark"] .cta p { color: #54635c; }
.cta .button { flex: none; background: #8bc8ae; color: #10241c; }
.cta .button:hover { background: #a5dac3; }
.disclaimer { max-width: 920px; margin: 25px auto 0; color: var(--ink-faint); font-size: .75rem; text-align: center; }
.toast { position: fixed; left: 50%; bottom: 20px; z-index: 15; transform: translate(-50%, calc(100% + 40px)); padding: 11px 15px; border-radius: 12px; background: var(--ink); color: var(--canvas); box-shadow: var(--shadow-lg); font-size: .8rem; font-weight: 720; opacity: 0; transition: transform .24s ease, opacity .24s ease; }
.toast.show { transform: translate(-50%, 0); opacity: 1; }
:focus-visible { outline: none; box-shadow: var(--focus); }
.segment:focus-visible, .button:focus-visible, .icon-button:focus-visible, .text-button:focus-visible, .history-actions button:focus-visible, summary:focus-visible { box-shadow: var(--focus); }
@media (min-width: 730px) { .quiet-link { display: inline-block; } }
@media (max-width: 900px) { .calculator-grid { grid-template-columns: 1fr; } .result-card { position: static; } }
@media (max-width: 620px) {
  .shell { width: min(100% - 20px, 1180px); padding-top: 12px; }
  .hero { padding-top: 48px; }
  h1 { font-size: clamp(2.5rem, 14vw, 4rem); }
  .form-card { padding: 20px 16px; }
  .card { border-radius: 23px; }
  .card-heading { margin-bottom: 22px; }
  .private-pill { display: none; }
  .segmented.three { grid-template-columns: 1fr; }
  .segmented.three .segment { text-align: left; padding-left: 14px; }
  .segmented.three .segment strong, .segmented.three .segment span { display: inline; }
  .segmented.three .segment span::before { content: " · "; }
  .select-grid { grid-template-columns: 1fr; gap: 0; }
  .comparison-grid { grid-template-columns: 1fr; }
  .comparison-tile { display: grid; grid-template-columns: 24px auto 1fr; align-items: center; gap: 8px; }
  .comparison-number, .comparison-label { margin: 0; }
  .form-actions .button { flex: 1 1 140px; }
  .energy-range { font-size: clamp(2.15rem, 12vw, 3.2rem); }
  .cta .button { width: 100%; }
}
@media (prefers-reduced-motion: reduce) { *, *::before, *::after { scroll-behavior: auto !important; animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; } }