:root {
  color-scheme: light;
  --paper:#f4f3ee; --white:#fffefa; --ink:#20231f; --muted:#64695f;
  --line:#dedfd7; --control-line:#858d80; --green:#315b45; --green-soft:#e6ece5;
  --lime:#c9e66d; --orange:#ad4e29; --orange-soft:#f4e5dc; --results-bg:#315b45;
  --mono:'IBM Plex Mono',Consolas,monospace; --sans:'DM Sans','Segoe UI',sans-serif;
}
html {background:var(--paper);color:var(--ink);}
* {box-sizing:border-box;}
body {margin:0;background:var(--paper);color:var(--ink);font-family:var(--sans);line-height:1.5;}
button,input,select {font:inherit;color:inherit;}
button {cursor:pointer;}
button:disabled {cursor:default;opacity:.65;}
.shell {width:min(1160px,calc(100% - 56px));margin:0 auto;}
header {min-height:72px;display:flex;align-items:center;justify-content:space-between;gap:12px;border-bottom:1px solid var(--line);}
.brand {display:flex;align-items:center;gap:11px;font-size:15px;font-weight:700;letter-spacing:.02em;}
.brand-mark {display:grid;width:29px;height:29px;place-items:center;color:var(--lime);background:var(--results-bg);border-radius:8px;}
.brand-mark svg {width:16px;height:16px;}
.header-actions,.theme-control {display:flex;align-items:center;gap:8px;}
.theme-control {gap:3px;}
.theme-switch {display:grid;place-items:center;width:44px;height:44px;border:0;padding:0;background:transparent;}
.switch-track {display:block;position:relative;width:36px;height:21px;border:1px solid var(--control-line);border-radius:20px;background:#d6dbd0;}
.switch-thumb {position:absolute;left:2px;top:2px;width:15px;height:15px;display:grid;place-items:center;border-radius:50%;background:#fffefa;color:#315b45;font-size:11px;line-height:1;box-shadow:0 1px 3px #0002;transition:transform .2s;}
.theme-switch[aria-checked='true'] .switch-track {background:#44633c;}
.theme-switch[aria-checked='true'] .switch-thumb {transform:translateX(15px);background:var(--lime);}
.theme-auto {min-height:44px;padding:0 5px;background:transparent;border:0;color:var(--muted);font-size:13px;}
.theme-auto[aria-pressed='true'] {color:var(--green);}
.theme-auto:hover {text-decoration:underline;text-underline-offset:3px;}
.reset-button {min-height:44px;padding:9px 13px;border:1px solid var(--control-line);border-radius:7px;background:var(--white);color:var(--green);font-size:14px;}
.reset-button:hover {background:var(--green-soft);}
.intro {padding:36px 0 26px;display:flex;align-items:end;justify-content:space-between;gap:30px;}
.eyebrow {margin:0 0 10px;color:var(--green);font:12px var(--mono);text-transform:uppercase;letter-spacing:.06em;}
h1 {margin:0;font-size:clamp(30px,4vw,43px);line-height:1.15;letter-spacing:-.035em;font-weight:600;}
.intro-copy {max-width:330px;margin:0 0 2px;color:var(--muted);font-size:16px;line-height:1.6;}
.safety {display:grid;grid-template-columns:20px minmax(0,1fr);gap:9px;margin:0 0 26px;padding:16px;background:var(--orange-soft);color:#623f31;border-radius:6px;font-size:14px;line-height:1.6;}
.safety svg {width:17px;height:17px;margin-top:3px;color:var(--orange);}
.workspace {display:grid;grid-template-columns:minmax(0,1.32fr) minmax(310px,.82fr);align-items:start;gap:42px;padding-bottom:32px;}
.inputs {min-width:0;}
.section {padding:23px 0 26px;border-top:1px solid var(--line);}
.section-heading {display:flex;align-items:baseline;justify-content:space-between;gap:12px;margin-bottom:18px;}
h2 {margin:0;font-size:18px;font-weight:600;}
.step {color:var(--muted);font:11px var(--mono);white-space:nowrap;}
.drinks {display:grid;gap:12px;}
.drink-row {display:grid;grid-template-columns:minmax(100px,1fr) 70px 94px 75px 44px;gap:9px;align-items:end;padding:11px;background:var(--white);border:1px solid var(--line);border-radius:8px;}
.field {display:grid;gap:6px;min-width:0;}
.field label,.field-label {color:var(--muted);font-size:14px;font-weight:500;}
.field input,.field select {width:100%;min-width:0;min-height:46px;padding:0 9px;background:var(--white);border:1px solid var(--control-line);border-radius:5px;font-size:16px;}
.field input[type='number'] {font-family:var(--mono);}
.remove {width:44px;height:46px;display:grid;place-items:center;padding:0;background:transparent;border:0;border-radius:5px;color:var(--muted);}
.remove:hover {background:var(--orange-soft);color:var(--orange);}
.remove svg {width:18px;height:18px;}
.row-total {margin:11px 0 0;color:var(--muted);font:13px/1.6 var(--mono);text-align:right;}
.row-total strong {color:var(--ink);font-weight:500;}
.text-button {display:inline-flex;align-items:center;gap:8px;min-height:44px;margin-top:12px;padding:10px 0;background:none;border:0;color:var(--green);font-size:14px;font-weight:600;}
.two-col {display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;}
.unit-field {position:relative;}
.unit-field input {padding-right:42px;}
.unit {position:absolute;right:10px;bottom:13px;color:var(--muted);font:13px var(--mono);pointer-events:none;}
.segmented {display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:4px;padding:4px;background:#e8e8e1;border-radius:7px;}
.segmented button {min-height:44px;padding:5px 8px;background:transparent;border:0;border-radius:4px;color:var(--muted);font-size:14px;transition:background .18s,color .18s;}
.segmented button[aria-pressed='true'] {background:var(--white);color:var(--ink);box-shadow:0 1px 3px #20231f16;}
.pace-options {display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:8px;}
.pace-option {min-height:80px;padding:12px;display:flex;flex-direction:column;justify-content:space-between;align-items:flex-start;gap:8px;background:var(--white);border:1px solid var(--control-line);border-radius:7px;text-align:left;}
.pace-option[aria-pressed='true'] {border-color:var(--green);background:var(--green-soft);box-shadow:inset 0 0 0 1px var(--green);}
.pace-option svg {width:20px;height:17px;color:var(--green);}
.pace-option span {font-size:14px;font-weight:500;line-height:1.4;}
.time-row {display:grid;grid-template-columns:repeat(2,minmax(0,1fr));align-items:end;gap:13px;}
.clock-settings {display:flex;align-items:center;justify-content:space-between;gap:14px;margin-bottom:18px;}
#local-clock {color:var(--green);font-size:14px;line-height:1.6;overflow-wrap:anywhere;}
.clock-toggle {grid-template-columns:repeat(2,minmax(0,1fr));flex:0 0 116px;}
.session-time {min-width:0;margin:0;padding:0;border:0;}
.session-time legend {color:var(--muted);font-size:14px;margin-bottom:8px;padding:0;}
.session-time input,.session-time select {min-width:0;width:100%;height:46px;padding:0 10px;border:1px solid var(--control-line);border-radius:6px;background:var(--white);font-size:16px;}
/* Date inputs need an explicit minimum reset in iOS Safari. */
.session-time input[type='date'] {max-width:100%;min-inline-size:0;}
.time-parts {display:flex;align-items:center;gap:6px;margin-top:8px;}
.time-parts select {flex:1;}
.time-parts span {color:var(--muted);}
.checkline {display:flex;align-items:center;gap:9px;min-height:44px;margin-top:14px;color:var(--ink);font-size:14px;cursor:pointer;}
.checkline input {flex-shrink:0;width:20px;height:20px;accent-color:var(--green);}
.help {margin:12px 0 0;color:var(--muted);font-size:14px;line-height:1.6;}
.mobile-results-link,.mobile-result-nav {display:none;}
.results {position:relative;min-width:0;margin-top:0;padding:24px 25px 20px;background:var(--results-bg);color:#f7f7ee;border-radius:9px;overflow:hidden;scroll-margin-top:16px;}
.results::before {position:absolute;top:-110px;right:-100px;width:250px;height:250px;content:'';border:1px solid #ffffff1b;border-radius:50%;box-shadow:0 0 0 26px #ffffff09,0 0 0 54px #ffffff06;pointer-events:none;}
.results > * {position:relative;}
.result-top {display:flex;flex-wrap:wrap;justify-content:space-between;gap:10px;color:#d2d9ce;font:12px var(--mono);text-transform:uppercase;letter-spacing:.04em;}
.live-dot {display:inline-block;width:7px;height:7px;margin-right:6px;background:var(--lime);border-radius:50%;box-shadow:0 0 0 4px #c9e66d20;vertical-align:1px;}
.gauge-wrap {display:grid;justify-items:center;padding:24px 0 22px;}
.gauge {--fill:0deg;position:relative;display:grid;width:194px;aspect-ratio:1;place-items:center;border-radius:50%;background:conic-gradient(from 220deg,var(--lime) var(--fill),#ffffff24 var(--fill));}
.gauge::before {position:absolute;inset:7px;content:'';background:var(--results-bg);border-radius:50%;}
.gauge-content {z-index:1;display:grid;justify-items:center;gap:1px;}
.bac {font:500 54px/1 var(--mono);letter-spacing:-.07em;font-variant-numeric:tabular-nums;}
.bac-unit {margin-top:8px;color:#d2d9ce;font:12px var(--mono);}
.status {display:inline-flex;align-items:center;gap:7px;max-width:100%;margin-top:13px;padding:7px 10px;color:#eff4dd;background:#ffffff16;border-radius:20px;font-size:14px;line-height:1.5;}
.status-mark,.milestone-icon {flex-shrink:0;}
.status-mark {width:7px;height:7px;background:var(--lime);border-radius:50%;}
.milestones {border-top:1px solid #ffffff2a;}
.milestone {display:grid;grid-template-columns:minmax(0,1fr);gap:5px;padding:14px 0;border-bottom:1px solid #ffffff2a;}
.milestone-label {display:flex;align-items:center;gap:10px;font-size:16px;}
.milestone-icon {display:grid;width:25px;height:25px;place-items:center;border:1px solid #ffffff70;border-radius:50%;color:var(--lime);font:12px var(--mono);}
.milestone-value {margin-left:35px;color:#e3e9dc;font:14px/1.6 var(--mono);overflow-wrap:anywhere;}
.summary {display:flex;justify-content:space-between;gap:12px;padding-top:14px;color:#cbd3c7;font-size:14px;}
.summary strong {color:#f7f7ee;font-family:var(--mono);font-weight:400;}
.session-note {color:#d2d9ce;font-size:14px;line-height:1.65;margin:14px 0;}
.disclaimer {margin:17px 0 0;padding-top:13px;border-top:1px solid #ffffff2a;color:#cbd3c7;font-size:14px;line-height:1.6;}
.method {display:flex;flex-wrap:wrap;justify-content:space-between;gap:8px;margin-top:12px;color:#d2d9ce;font:11px/1.6 var(--mono);}
.input-error {padding:12px;border:1px solid #ac5439;border-radius:7px;background:#542b23;color:#ffe4d5;font-size:14px;line-height:1.6;}
.notice {padding:12px;border:1px solid var(--control-line);border-radius:7px;color:var(--ink);font-size:14px;}
[aria-invalid='true'] {border:2px solid var(--orange) !important;}
#trajectory {margin-top:20px;border-top:1px solid #ffffff2a;padding-top:10px;}
#trajectory h3 {font-size:16px;font-weight:500;margin:6px 0 14px;}
#chart {width:100%;display:block;overflow:visible;}
.methodology {margin:22px 0;padding:18px 0;border-top:1px solid var(--line);font-size:14px;line-height:1.7;color:var(--muted);}
.methodology summary {min-height:44px;cursor:pointer;color:var(--green);font-weight:600;}
.methodology a {color:var(--green);text-underline-offset:3px;overflow-wrap:anywhere;}
footer {display:flex;justify-content:space-between;gap:20px;padding:17px 0 26px;border-top:1px solid var(--line);color:var(--muted);font-size:13px;line-height:1.6;}
.sr-only {position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0;}
button:focus-visible,input:focus-visible,select:focus-visible,summary:focus-visible,a:focus-visible {outline:3px solid var(--green);outline-offset:3px;}
.results:focus-visible {outline:3px solid var(--ink);outline-offset:3px;}
[hidden] {display:none !important;}
:root[data-theme='dark'] {
  color-scheme:dark;--paper:#151b17;--white:#202a22;--ink:#edf2e8;--muted:#adb8a9;
  --line:#3c493d;--control-line:#81947a;--green:#acd78d;--green-soft:#304330;
  --orange:#f1ac81;--orange-soft:#3e2c23;--results-bg:#253d30;
}
:root[data-theme='dark'] .segmented {background:#0e1510;}
:root[data-theme='dark'] .segmented button[aria-pressed='true'] {background:#364b31;color:#eff5e9;}
:root[data-theme='dark'] .safety {color:#f2ccb5;}
select {
  appearance:none;-webkit-appearance:none;color:var(--ink);-webkit-text-fill-color:var(--ink);
  background-color:var(--white);padding-right:28px !important;
  background-image:linear-gradient(45deg,transparent 50%,var(--muted) 50%),linear-gradient(135deg,var(--muted) 50%,transparent 50%);
  background-position:calc(100% - 15px) 50%,calc(100% - 10px) 50%;background-size:5px 5px;background-repeat:no-repeat;
}
select option {background:var(--white);color:var(--ink);-webkit-text-fill-color:var(--ink);}
/* Explicit native-control colors also cover WebKit's initial dark-mode paint. */
:root[data-theme='dark'] select {color:#edf2e8;background-color:#202a22;-webkit-text-fill-color:#edf2e8;}
:root[data-theme='light'] select {color:#20231f;background-color:#fffefa;-webkit-text-fill-color:#20231f;}
@media (max-width:1040px) {
  body {padding-bottom:calc(76px + env(safe-area-inset-bottom,0px));}
  .shell {max-width:680px;}
  .workspace {grid-template-columns:minmax(0,1fr);gap:20px;}
  .intro {display:block;padding:24px 0;}
  .intro-copy {margin-top:12px;max-width:none;}
  .mobile-results-link {display:inline-flex;align-items:center;min-height:44px;margin:-6px 0 14px;color:var(--green);font-size:14px;text-underline-offset:4px;}
  .mobile-result-nav {position:fixed;z-index:5;left:14px;right:14px;bottom:calc(10px + env(safe-area-inset-bottom,0px));display:flex;align-items:center;justify-content:space-between;gap:12px;min-height:50px;max-width:652px;margin:0 auto;padding:12px 16px;background:var(--results-bg);color:#f7f7ee;border:1px solid #cbd3c7;border-radius:8px;box-shadow:0 3px 14px #0003;text-decoration:none;font-size:16px;}
  .mobile-result-nav strong {margin-left:auto;font:500 16px var(--mono);}
  .mobile-result-nav:focus-visible {outline-color:var(--ink);}
}
@media (max-width:600px) {
  .shell {width:calc(100% - 28px);}
  .drink-row {grid-template-columns:repeat(3,minmax(0,1fr));gap:12px 8px;padding:14px;}
  .drink-row .field:first-child {grid-column:1 / 3;grid-row:1;}
  .drink-row .remove {grid-column:3;grid-row:1;justify-self:end;align-self:end;}
  .drink-row .field:nth-child(2) {grid-column:1;grid-row:2;}
  .drink-row .field:nth-child(3) {grid-column:2;grid-row:2;}
  .drink-row .field:nth-child(4) {grid-column:3;grid-row:2;}
  .field input,.field select {padding:0 8px;}
  .unit-field input {padding-right:42px;}
  .two-col,.time-row {grid-template-columns:minmax(0,1fr);gap:18px;}
  .clock-settings {align-items:flex-start;}
  .pace-option {min-height:88px;padding:12px 8px;}
  .results {padding:22px 18px;}
  .gauge {width:174px;}
  .section-heading {align-items:center;}
  .step {font-size:10px;}
  footer {flex-direction:column;gap:8px;}
}
@media (max-width:380px) {
  header {gap:7px;}
  .brand {gap:7px;font-size:14px;}
  .header-actions {gap:3px;}
  .reset-button {padding:7px;font-size:12px;}
  .drink-row {padding:10px;gap:10px 5px;}
  .field label {font-size:13px;}
  .pace-options {gap:5px;}
  .clock-settings {flex-wrap:wrap;}
}
@media (prefers-reduced-motion:reduce) {
  *,*::before,*::after {scroll-behavior:auto !important;animation:none !important;transition:none !important;}
}