:root {
  color-scheme: light;
  --momentum-page: #edf1e9;
  --momentum-panel: #f8faf5;
  --momentum-ink: #13202d;
  --momentum-muted: #53616c;
  --momentum-line: #cad2c7;
  --momentum-accent: #c5ed65;
  --accent-ink: #13202d;
  --chart-daily: #176de0;
  --chart-three: #b84d30;
  --chart-seven: #13202d;
  --chart-grid: #d6ddd2;
  --chart-axis: #617076;
  --chart-tooltip: #fbfdf8;
  --chart-font-size: 12px;
  --warning: #8a382c;
  --warning-fill: #f9e9dc;
  --sync-error: #da1e28;
  --motion-fast: 140ms;
  --motion-fade: 240ms;
  --motion-layout: 260ms;
  --motion-ease: cubic-bezier(.2, .7, .25, 1);
  --sans: Aptos, "Segoe UI", Helvetica, Arial, sans-serif;
  --display: "Arial Narrow", "Roboto Condensed", var(--sans);
  /* Aliases retained for the development concepts. */
  --ink: var(--momentum-ink);
  --muted-ink: var(--momentum-muted);
  --paper: var(--momentum-page);
  --white: var(--momentum-panel);
  --rule: var(--momentum-line);
  --teal-dark: var(--chart-daily);
  --serif: Charter, Georgia, serif;
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --momentum-page: #17212a;
  --momentum-panel: #202d36;
  --momentum-ink: #edf3e7;
  --momentum-muted: #b4c1c7;
  --momentum-line: #42525a;
  --chart-daily: #7eb3ff;
  --chart-three: #f4a287;
  --chart-seven: #d7edb2;
  --chart-grid: #41515a;
  --chart-axis: #b4c1c7;
  --chart-tooltip: #263640;
  --warning: #ffbd9f;
  --warning-fill: #3c302a;
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
html, body { background: var(--momentum-page); color: var(--momentum-ink); }
/* Keep page scrolling available without the visible scrollbar track. */
html { scrollbar-width: none; }
html::-webkit-scrollbar, body::-webkit-scrollbar { display: none; }
body { margin: 0; min-height: 100vh; font-family: var(--sans); line-height: 1.5; }
button, input, select { font: inherit; }
button, summary, select { cursor: pointer; touch-action: manipulation; }
a { color: var(--chart-daily); text-underline-offset: .2em; }
button, summary, a, input, select { -webkit-tap-highlight-color: transparent; }
button, summary, input, select { transition: border-color var(--motion-fast) var(--motion-ease), background-color var(--motion-fast) var(--motion-ease); }
button:disabled { opacity: .6; cursor: wait; }
:focus-visible { outline: 3px solid var(--chart-daily); outline-offset: 3px; }
.skip-link { position: fixed; top: -5rem; left: 1rem; z-index: 30; padding: .75rem 1rem; background: var(--momentum-accent); color: var(--accent-ink); }
.skip-link:focus { top: 1rem; }

.production-dashboard, .history, .visit-history, .data-status-shell { width: min(100%, 74rem); min-height: 100vh; margin: 0 auto; padding: 0 clamp(.625rem, 2vw, 1.5rem) 2rem; }
.production-dashboard { overflow-anchor: none; min-height: calc(100vh + var(--chart-settings-height, 0px)); }
.production-topbar { border-bottom: 1px solid var(--momentum-line); overflow-anchor: none; }
.topbar-row { display: flex; min-height: 4rem; align-items: center; justify-content: space-between; gap: .5rem; }
.production-wordmark { display: inline-flex; align-items: center; gap: .65rem; color: var(--momentum-ink); font-weight: 750; letter-spacing: -.035em; text-decoration: none; }
.production-mark { display: grid; width: 1.85rem; height: 1.85rem; place-items: center; border-radius: 50%; color: var(--accent-ink); background: var(--momentum-accent); font-size: .85rem; font-weight: 850; }

/* Shared controls: lime commits a choice; quiet outlines expose secondary actions. */
.icon-button, .pagination a, .visit-pagination a {
  display: inline-flex; align-items: center; justify-content: center; gap: .6rem; min-height: 44px; padding: .55rem .9rem; border: 1px solid var(--momentum-line); border-radius: 8px; background: var(--momentum-panel); color: var(--momentum-ink); font-size: .82rem; font-weight: 650; line-height: 1.3; text-decoration: none;
}
.icon-button:hover, .pagination a:hover, .visit-pagination a:hover { border-color: var(--momentum-muted); }
.primary-action, .filter-action, .custom-range button { min-height: 48px; padding: .65rem 1.1rem; border: 1px solid transparent; border-radius: 8px; color: var(--accent-ink); background: var(--momentum-accent); font-weight: 750; }
.primary-action:hover, .filter-action:hover, .custom-range button:hover { border-color: var(--momentum-muted); }
summary { list-style: none; }
summary::-webkit-details-marker { display: none; }
.chart-help summary::after { content: ''; display: inline-block; width: 6px; height: 6px; border-right: 1.5px solid currentColor; border-bottom: 1.5px solid currentColor; transform: rotate(45deg) translateY(-2px); transition: transform var(--motion-fast) var(--motion-ease); margin-left: .3rem; }
details[open] > summary::after { transform: rotate(225deg) translate(-1px, -1px); }
/* Keep navigation and utilities on one row without a scrolling menu. */
.compact-menu { display: flow-root; container-type: inline-size; }
.menu-panel { display: flex; align-items: center; justify-content: space-between; gap: .25rem; margin: 0 0 .5rem; padding: .25rem; border: 1px solid var(--momentum-line); border-radius: 10px; background: var(--momentum-panel); }
.menu-panel nav { display: grid; grid-template-columns: repeat(3, auto); flex: 1; min-width: 0; gap: .125rem; }
.menu-panel nav a { display: inline-flex; align-items: center; justify-content: center; min-height: 44px; padding: .25rem .35rem; border-radius: 6px; color: var(--momentum-muted); font-family: var(--sans); font-size: .85rem; font-weight: 600; text-decoration: none; white-space: nowrap; }
.menu-panel nav a:hover { background: var(--momentum-page); color: var(--momentum-ink); }
.menu-panel nav [aria-current="page"] { background: var(--momentum-accent); color: var(--accent-ink); font-weight: 700; }
.menu-tools { display: flex; align-items: center; flex-shrink: 0; gap: .25rem; }
.menu-tools form { margin: 0; }
.menu-timezone select { min-height: 44px; width: 50px; padding: .2rem; border: 1px solid var(--momentum-line); border-radius: 8px; color: var(--momentum-ink); background: var(--momentum-panel); font-size: .75rem; }
.menu-panel .theme-switch { border-radius: 8px; background: var(--momentum-page); color: var(--momentum-ink); }
@container (max-width: 22rem) {
  .menu-panel nav { gap: 0; }
  .menu-panel nav a { padding-inline: .2rem; font-size: .75rem; }
  .menu-tools { gap: .125rem; }
  .menu-timezone select { width: 46px; }
}
@container (min-width: 34rem) {
  .menu-panel { gap: 1rem; }
  .menu-panel nav { flex: 0 1 24rem; grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .menu-tools { gap: .5rem; padding-left: 1rem; border-left: 1px solid var(--momentum-line); }
  .menu-timezone select { width: 9rem; }
}

.topbar-actions, .chart-actions { display: flex; align-items: center; flex-shrink: 0; gap: .5rem; }
.topbar-actions form { margin: 0; }
.icon-button { width: 44px; height: 44px; padding: 0; flex-shrink: 0; }
.icon { display: block; flex-shrink: 0; }
.icon-button:active, .theme-switch:active, .control-ack, .theme-switch.control-ack { border-color: var(--momentum-ink); background-color: var(--momentum-line); }
[data-menu-toggle][aria-expanded="true"], [data-chart-settings-toggle][aria-expanded="true"] { border-color: var(--momentum-muted); background: var(--momentum-page); }
[data-sync-button] { position: relative; }
[data-sync-button] > .icon { width: 22px; height: 22px; stroke-width: 2; }
[data-sync-button][aria-busy="true"] > .icon { animation: sync-spin 1.2s linear infinite; }
.sync-error-badge { position: absolute; top: -4px; right: -4px; display: grid; place-items: center; width: 16px; height: 16px; border-radius: 50%; background: var(--sync-error); color: #fff; box-shadow: 0 0 0 2px var(--momentum-page); pointer-events: none; }
.sync-error-badge .icon { width: 12px; height: 12px; stroke-width: 3; }
@keyframes sync-spin { to { transform: rotate(360deg); } }

.production-hero { display: grid; grid-template-columns: minmax(0, 1fr) minmax(8rem, .65fr); align-items: center; gap: 1rem 2rem; padding: 1rem 0; }
.history-heading h1, .visit-history-heading h1, .data-status-heading h1 { margin: 0; font: 800 clamp(2rem, 5vw, 3.6rem)/1.08 var(--display); letter-spacing: -.06em; }
.production-reading { min-width: 0; text-align: left; }
.production-reading p { margin: .2rem 0 0; color: var(--momentum-muted); font-size: .8rem; }
.production-reading .reading-number { display: flex; align-items: baseline; gap: .5rem; margin: 0; font: 700 clamp(3.2rem, 7vw, 5rem)/1.05 var(--sans); letter-spacing: -.035em; font-variant-numeric: lining-nums tabular-nums; white-space: nowrap; }
.production-reading .reading-number span { color: var(--momentum-muted); font: 600 1rem var(--sans); letter-spacing: 0; }
.reading-details { margin-top: .65rem; }
.production-reading .measurement-count { font-size: .75rem; }
.production-reading--empty { grid-column: 1 / -1; }
.production-reading--empty h1 { font-size: 1.25rem; }
.production-comparisons { display: grid; gap: .6rem; margin: 0; padding-left: 1.25rem; border-left: 1px solid var(--momentum-line); }
.production-comparisons dt { color: var(--momentum-muted); font-size: .75rem; }
.production-comparisons dd { margin: .05rem 0 0; font-weight: 750; font-size: 1rem; font-variant-numeric: tabular-nums; }
.production-reading .production-stale { margin-top: .45rem; color: var(--warning); }
.production-chart-section { position: relative; }
.production-chart-heading { display: flex; align-items: center; justify-content: flex-end; gap: .5rem; }
.production-chart-heading h2 { margin: 0; font-size: 1.25rem; letter-spacing: -.035em; }
.range-rail { position: relative; display: grid; grid-template-columns: repeat(6, minmax(0, 1fr)) minmax(3.6rem, 1.3fr); gap: .2rem; margin: .5rem 0; padding: .2rem; border: 1px solid var(--momentum-line); border-radius: 10px; background: var(--momentum-panel); }
.range-rail button { position: relative; z-index: 1; min-width: 0; min-height: 44px; padding: .4rem .3rem; border: 0; border-radius: 6px; background: transparent; color: var(--momentum-muted); font-size: .82rem; font-weight: 650; }
.range-rail button:hover { color: var(--momentum-ink); background: var(--momentum-page); }
.range-rail button[aria-pressed="true"] { color: var(--accent-ink); background: var(--momentum-accent); }
.range-highlight { position: absolute; top: 0; left: 0; border-radius: 6px; background: var(--momentum-accent); opacity: 0; pointer-events: none; }
.range-rail--animated .range-highlight { opacity: 1; transition: transform var(--motion-layout) var(--motion-ease), width var(--motion-layout) var(--motion-ease); }
.range-rail--animated button[aria-pressed="true"] { background: transparent; }
.custom-range-fields, .history-filters { display: grid; grid-template-columns: minmax(0, 13rem) minmax(0, 13rem) auto; justify-content: start; align-items: end; gap: .75rem; margin: 1rem 0 1.5rem; }
.custom-range label, .field label { display: block; margin-bottom: .4rem; font-size: .8rem; font-weight: 650; }
.custom-range label { display: grid; gap: .2rem; margin: 0; }
.custom-range { display: flow-root; margin: 0; }
.custom-range-fields { gap: .5rem; margin: 0; padding: .25rem 0 .75rem; }
.custom-range input, .field input { min-width: 0; width: 100%; min-height: 48px; padding: .55rem .75rem; border: 1px solid var(--momentum-line); border-radius: 8px; background: var(--momentum-panel); color: var(--momentum-ink); font-size: 1rem; }
.field input:focus, .custom-range input:focus { border-color: var(--chart-daily); }
.field { min-width: 0; margin-bottom: 1.25rem; }
.history-filters .field { margin: 0; }
.custom-range-error, .history-filter-error { grid-column: 1 / -1; margin: 0; color: var(--warning); font-size: .82rem; }
.production-chart-frame { border: 1px solid var(--momentum-line); border-radius: 10px; background: var(--momentum-panel); }
.production-chart { width: 100%; height: clamp(17rem, 42vw, 25rem); touch-action: pan-y; }
.chart-settings { display: flow-root; }
.chart-settings-panel { max-height: 60vh; overflow-y: auto; display: flex; flex-wrap: wrap; align-items: start; gap: .75rem 1rem; margin-top: .85rem; padding: .5rem; border: 1px solid var(--momentum-line); border-radius: 10px; background: var(--momentum-panel); }
.chart-settings-panel fieldset { flex: 1 1 19rem; min-width: 0; margin: 0; padding: 0; border: 0; }
.chart-settings-panel legend { margin-bottom: .4rem; padding: 0; font-size: .8rem; font-weight: 700; }
.series-switches { display: flex; flex-wrap: wrap; gap: .25rem; }
.series-switches label { display: flex; min-height: 44px; align-items: center; gap: .25rem; padding: .4rem 0; border-radius: 6px; color: var(--momentum-muted); font-size: .75rem; cursor: pointer; }
.series-switches label:hover { background: var(--momentum-page); }
.series-switches label:has(input:checked) { color: var(--momentum-ink); }
.series-switches input { width: 1rem; height: 1rem; margin: 0; accent-color: var(--chart-daily); }
.series-key { width: .65rem; height: .2rem; background: var(--chart-daily); }
.series-key--three { background: repeating-linear-gradient(to right, var(--chart-three) 0 2px, transparent 2px 4px); }
.series-key--seven { background: var(--chart-seven); }
.resolution-options { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: .25rem; }
.chart-settings-panel button { min-height: 44px; padding: .5rem; border: 1px solid var(--momentum-line); border-radius: 6px; background: transparent; color: var(--momentum-ink); font-size: .8rem; }
.chart-settings-panel button:hover { background: var(--momentum-page); border-color: var(--momentum-muted); }
.chart-settings-panel button[aria-pressed="true"] { background: var(--momentum-accent); color: var(--accent-ink); border-color: transparent; }
.chart-footer { display: grid; grid-template-columns: 1fr auto; align-items: start; font-size: .8rem; }
.chart-footer > a { grid-column: 2; grid-row: 1; justify-self: end; display: inline-flex; align-items: center; min-height: 44px; padding-block: .75rem; }
.chart-help { grid-column: 1 / -1; grid-row: 1; min-width: 0; font-size: .8rem; }
.chart-help summary { width: fit-content; display: flex; gap: .3rem; align-items: center; min-height: 44px; color: var(--momentum-muted); }
.chart-help p { max-width: 65ch; color: var(--momentum-muted); }
.chart-resolution-note, .chart-status { margin: .3rem 0 0; color: var(--momentum-muted); font-size: .78rem; }
.chart-status:empty { display: none; }

.history-heading, .visit-history-heading, .data-status-heading { padding: 2.2rem 0 1.5rem; }
.history-heading p { margin: .7rem 0 0; color: var(--momentum-muted); font-size: .85rem; }
.history-day { margin-bottom: 1.2rem; border: 1px solid var(--momentum-line); border-radius: 10px; overflow: hidden; background: var(--momentum-panel); }
.history-day-heading { display: flex; align-items: baseline; justify-content: space-between; flex-wrap: wrap; gap: .3rem 1rem; padding: 1rem; border-bottom: 1px solid var(--momentum-line); }
.history-day-heading h2 { margin: 0; font-size: 1.05rem; letter-spacing: -.025em; }
.history-day-heading p { margin: 0; font-size: .9rem; font-weight: 700; }
.history-day-heading span { margin-right: .4rem; color: var(--momentum-muted); font-size: .8rem; font-weight: 400; }
.history-table-scroll { overflow-x: auto; }
.history-table { width: 100%; border-collapse: collapse; text-align: left; font-size: .88rem; }
.history-table th, .history-table td { padding: .85rem 1rem; border-bottom: 1px solid var(--momentum-line); }
.history-table th { color: var(--momentum-muted); font-size: .78rem; font-weight: 600; }
.history-table td { font-variant-numeric: tabular-nums; }
.history-table td:nth-child(2) { white-space: nowrap; font-weight: 650; }
.history-table td:last-child { overflow-wrap: anywhere; }
.history-table tr:last-child td { border-bottom: 0; }
.empty-history { padding: 1.5rem; background: var(--momentum-panel); border-radius: 8px; }
.pagination, .visit-pagination { display: flex; align-items: center; justify-content: center; gap: 1rem; padding-top: 1rem; font-size: .85rem; }
.form-error { padding: .8rem 1rem; border-left: 3px solid var(--warning); color: var(--warning); background: var(--warning-fill); font-size: .9rem; }

.login-layout { display: grid; grid-template-columns: 1fr 1fr; min-height: 100vh; }
.login-intro { display: flex; flex-direction: column; justify-content: space-between; padding: clamp(2rem, 6vw, 5rem); background: var(--momentum-page); }
.login-intro h1 { margin: 3rem 0 1rem; font: 850 clamp(3rem, 6vw, 6rem)/1 var(--display); letter-spacing: -.075em; }
.login-intro p { margin: 0; color: var(--momentum-muted); }
.login-panel { display: grid; place-items: center; padding: 2rem; background: var(--momentum-panel); }
.login-panel-inner { width: min(100%, 23rem); }
.login-panel h2 { margin: 0 0 1.7rem; font-size: 2rem; letter-spacing: -.04em; }
.primary-action { width: 100%; }

@media (max-width: 720px) {
  .production-hero { gap: .8rem; padding: 1rem 0; }
  .production-reading .reading-number { font-size: clamp(2rem, 11vw, 3.5rem); }
  .reading-details p { font-size: .75rem; }
  .production-comparisons { padding-left: .8rem; }
  .production-comparisons dt { font-size: .7rem; }
  .production-comparisons dd { font-size: .86rem; }
  .login-layout { grid-template-columns: 1fr; min-height: 100svh; align-content: start; }
  .login-intro { padding: 1.5rem; }
  .login-intro h1 { margin: 2rem 0 .4rem; font-size: 3rem; }
  .login-panel { padding: 2rem 1.5rem 3rem; }
}
@media (max-width: 640px) {
  .custom-range-fields, .history-filters { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .custom-range button, .history-filters button { grid-column: 1 / -1; }
}
@media (max-width: 480px) {
  .production-dashboard, .history, .visit-history, .data-status-shell { padding-inline: .625rem; }
  .range-rail { gap: .05rem; }
  .range-rail button { font-size: .75rem; }
  .history-table th, .history-table td { padding: .65rem .6rem; font-size: .78rem; }
  .chart-footer { gap: .5rem; }
}
@media (max-width: 360px) {
  .history-filters { grid-template-columns: 1fr; }
}
@media (max-width: 340px) {
  .custom-range-fields { grid-template-columns: 1fr; }
}
@media (orientation: landscape) and (max-height: 560px) and (max-width: 900px) {
  .production-chart { height: 15rem; }
}
@media (prefers-reduced-motion: reduce) {
  :root { --motion-fast: 0ms; --motion-fade: 0ms; --motion-layout: 0ms; }
  *, *::before, *::after { scroll-behavior: auto !important; transition: none !important; animation: none !important; }
}
/* Axis gutters are navigation targets; pointer feedback never repaints series. */
.production-chart { position: relative; }
.chart-canvas { position: absolute; inset: 0; }
.chart-axis { position: absolute; z-index: 2; border: 0; border-radius: 0; padding: 0; margin: 0; background: transparent; min-height: 0; touch-action: none; }
.chart-axis--x { left: 48px; right: 20px; bottom: 0; height: 44px; cursor: ew-resize; }
.chart-axis--y { left: 0; top: 24px; bottom: 44px; width: 48px; cursor: ns-resize; }
.chart-axis:hover { background: rgb(97 112 118 / .06); }
.chart-axis:focus-visible { outline: 2px solid var(--chart-daily); outline-offset: -2px; }
.chart-value-tooltip, .chart-date-tooltip { position: absolute; z-index: 4; pointer-events: none; border: 1px solid var(--chart-grid); border-radius: 4px; background: var(--chart-tooltip); color: var(--momentum-ink); box-shadow: 0 2px 6px rgb(19 32 45 / .1); font-family: var(--sans); font-size: var(--chart-font-size); line-height: 1.5; font-variant-numeric: tabular-nums; white-space: nowrap; }
.chart-value-tooltip { padding: 6px 8px; }
.chart-value-tooltip > div { display: flex; justify-content: space-between; gap: 12px; }
.chart-value-tooltip b { font-weight: 650; }
.chart-date-tooltip { padding: 3px 7px; font-weight: 500; }
.chart-crosshair { position: absolute; z-index: 1; pointer-events: none; top: 24px; bottom: 44px; border-left: 1px dashed var(--chart-axis); }
.chart-marker { position: absolute; left: -4px; top: -4px; width: 8px; height: 8px; border: 2px solid var(--chart-tooltip); border-radius: 50%; box-sizing: border-box; pointer-events: none; z-index: 3; }


.chart-canvas:focus-visible { outline: 2px solid var(--chart-daily); outline-offset: -2px; }

.visually-hidden { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip-path: inset(50%); white-space: nowrap; border: 0; }

.log-tabs { display: flex; flex-wrap: wrap; gap: .5rem; padding: 1rem 0; }
.log-tabs a { display: inline-flex; align-items: center; min-height: 44px; padding: .5rem .85rem; border: 1px solid var(--momentum-line); border-radius: 8px; color: var(--momentum-ink); background: var(--momentum-panel); text-decoration: none; }
.log-tabs [aria-current="page"] { background: var(--momentum-accent); color: var(--accent-ink); font-weight: 700; }