:root {
    --bg: #22190a; --bg2: #120d04; --card: rgba(255,255,255,.06); --line: rgba(255,255,255,.17);
    --ink: #fdf6e8; --muted: #e0cfae; --accent: #ffc14d; --accent-ink: #2b1a00; --link: #ffc14d; --field: rgba(255,255,255,.08);
    --soft: rgba(255,193,77,.14); --good: #69db7c; --bad: #ffa8a8; --warn: #ffd43b;
    color-scheme: dark;
}
@media (prefers-color-scheme: light) {
    :root { --bg: #fff8ea; --bg2: #fbeed2; --card: #fff; --line: #ead6ad; --ink: #2b1d05; --muted: #6b5426;
            --accent: #f59f00; --accent-ink: #2b1a00; --link: #a35400; --field: #fffcf4; --soft: #fff0cc; --good: #2b8a3e; --bad: #c92a2a; --warn: #b35c00; color-scheme: light; }
}
:root[data-theme="light"] { --bg: #fff8ea; --bg2: #fbeed2; --card: #fff; --line: #ead6ad; --ink: #2b1d05; --muted: #6b5426;
            --accent: #f59f00; --accent-ink: #2b1a00; --link: #a35400; --field: #fffcf4; --soft: #fff0cc; --good: #2b8a3e; --bad: #c92a2a; --warn: #b35c00; color-scheme: light; }
:root[data-theme="dark"] {
    --bg: #22190a; --bg2: #120d04; --card: rgba(255,255,255,.06); --line: rgba(255,255,255,.17);
    --ink: #fdf6e8; --muted: #e0cfae; --accent: #ffc14d; --accent-ink: #2b1a00; --link: #ffc14d; --field: rgba(255,255,255,.08);
    --soft: rgba(255,193,77,.14); --good: #69db7c; --bad: #ffa8a8; --warn: #ffd43b;
    color-scheme: dark;
}
* { box-sizing: border-box; }
body { margin: 0; min-height: 100vh; padding: clamp(1rem,4vw,2.5rem) 1rem 4rem; display: flex; justify-content: center;
       font: 16px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; color: var(--ink);
       background: var(--bg2) linear-gradient(180deg, var(--bg), var(--bg2) 900px) no-repeat; touch-action: manipulation; }
.app { width: min(560px, 100%); min-width: 0; display: flex; flex-direction: column; }
.col-a, .col-b { display: contents; }
.app > .topbar, .app > .back { order: 0; }
.app > header { order: 1; }
.app > .warn { order: 2; }
.meters { order: 3; }
.add { order: 4; }
.tools { order: 5; }
.how { margin: 0; padding-left: 1.3rem; display: grid; gap: .5rem; }
.how li { overflow-wrap: anywhere; }
.intro { order: 5; }
.app > .faq { order: 6; }
.app > footer { order: 7; }
header { text-align: center; margin-bottom: 1.1rem; }
h1 { margin: 0; font-size: 1.7rem; line-height: 1.2; letter-spacing: -.02em; }
.sub { margin: .4rem 0 0; color: var(--muted); font-size: 1rem; }
h2 { margin: 0 0 .7rem; font-size: 1.15rem; overflow-wrap: anywhere; }
h3 { margin: 1.1rem 0 .4rem; font-size: 1rem; }
.warn { margin: 0 0 .9rem; padding: .7rem .85rem; border-radius: 12px; border: 1px solid var(--bad); color: var(--bad); font-weight: 600; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 16px; padding: 1.1rem; margin-bottom: .9rem; min-width: 0; }
label, legend { display: block; margin: .9rem 0 .35rem; font-size: .9rem; font-weight: 600; color: var(--muted); padding: 0; }
input[type=text], input[type=date], select { width: 100%; min-width: 0; min-height: 48px; padding: .6rem .8rem; font: inherit; font-size: 1.05rem; color: var(--ink);
       background: var(--field); border: 1px solid var(--line); border-radius: 12px; }
input[type=date] { -webkit-appearance: none; appearance: none; display: block; }
input[type=date]::-webkit-date-and-time-value { text-align: left; }
input[aria-invalid="true"] { border-color: var(--bad); }
select option { color: #111; background: #fff; }
input:focus-visible, button:focus-visible, select:focus-visible, summary:focus-visible, a:focus-visible { outline: 3px solid var(--link); outline-offset: 2px; }
::placeholder { color: var(--muted); opacity: .75; }
.hint { margin: .45rem 0 0; color: var(--muted); font-size: .88rem; overflow-wrap: anywhere; }
.hint.top { margin: -.3rem 0 .7rem; }
[hidden] { display: none !important; }
.field { min-width: 0; }
.two { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: .6rem; align-items: end; }
.amount-row { display: flex; align-items: stretch; gap: .4rem; min-width: 0; }
.cur-tag { display: flex; align-items: center; padding: 0 .7rem; border: 1px solid var(--line); border-radius: 12px; background: var(--field); font-weight: 700; color: var(--muted); flex: none; }
.sub-box { margin: .6rem 0 0; padding: .2rem .9rem .9rem; border: 1px solid var(--line); border-radius: 14px; min-width: 0; }
.sub-box legend { margin: 0; padding: 0 .4rem; font-size: .95rem; color: var(--ink); }

/* price steps */
.steps { display: grid; gap: .55rem; margin-top: .6rem; }
.step { padding: .2rem .75rem .65rem; border: 1px solid var(--line); border-radius: 12px; background: var(--field); min-width: 0; }
.step-h { margin: .5rem 0 0; font-weight: 700; overflow-wrap: anywhere; }
.step-g { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: .5rem; }
.step-g.one { grid-template-columns: minmax(0, 1fr); }
.step label { margin-top: .5rem; }
.small-link { min-height: 40px; font-size: .88rem; }

/* buttons */
.primary, .secondary, .danger { display: flex; align-items: center; justify-content: center; width: 100%; min-height: 48px; padding: .5rem .8rem; border-radius: 12px;
       font: inherit; font-weight: 700; text-align: center; text-decoration: none; cursor: pointer; line-height: 1.2; overflow-wrap: anywhere; }
.primary { border: 0; background: var(--accent); color: var(--accent-ink); }
.secondary { border: 1px solid var(--line); background: var(--field); color: var(--ink); font-weight: 600; }
.secondary.small { width: auto; min-height: 42px; padding: 0 .8rem; font-size: .92rem; margin: 0; }
.danger { border: 1px solid var(--bad); background: transparent; color: var(--bad); font-weight: 600; margin-top: .9rem; }
.danger-t { color: var(--bad) !important; }
.link { display: block; min-height: 44px; margin-top: .3rem; padding: 0 .1rem; border: 0; background: none; color: var(--link); font: inherit; font-size: .95rem; font-weight: 600; text-align: left; cursor: pointer; }
.link.inline { display: inline; min-height: 0; margin: 0; padding: .55rem .2rem; text-decoration: underline; }
button:disabled { opacity: .45; cursor: default; }
.row-btns { display: flex; flex-wrap: wrap; gap: .5rem; margin-top: 1rem; }
.row-btns > * { flex: 1 1 8rem; }
.tool-grid { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: .5rem; margin-top: .9rem; }
.chip { min-height: 44px; padding: 0 .9rem; border-radius: 999px; border: 1px solid var(--line); background: var(--field); color: var(--ink); font: inherit; font-size: .95rem; font-weight: 600; cursor: pointer; }
.chip:hover { border-color: var(--accent); }
.quick { display: flex; flex-wrap: wrap; gap: .45rem; }
.check { display: flex; align-items: center; gap: .6rem; margin: .6rem 0 0; min-height: 44px; color: var(--ink); font-size: .95rem; font-weight: 500; cursor: pointer; }
.check input { width: 24px; height: 24px; accent-color: var(--accent); flex: none; margin: 0; }
.check span { overflow-wrap: anywhere; min-width: 0; }

.err { margin: .4rem 0 0; color: var(--bad); font-weight: 600; font-size: .92rem; overflow-wrap: anywhere; }
.err:empty { margin: 0; }
.msg { margin: 0; color: var(--muted); font-size: .95rem; overflow-wrap: anywhere; }
.msg.show { margin-top: .8rem; padding: .6rem .75rem; border-radius: 12px; background: var(--soft); color: var(--ink); }
.msg.bad { color: var(--bad); }
#top-msg.show { margin: 0 0 .9rem; }

/* meters */
.m-list { display: grid; gap: .9rem; margin-bottom: .9rem; }
.meter { background: var(--card); border: 1px solid var(--line); border-top: 6px solid var(--accent); border-radius: 16px; padding: 1rem 1.1rem 1.1rem; min-width: 0; }
.m-top { display: flex; flex-wrap: wrap; align-items: center; gap: .3rem .6rem; }
.m-name { margin: 0; font-size: 1.3rem; overflow-wrap: anywhere; min-width: 0; }
.tag { display: inline-block; padding: .05rem .55rem; border-radius: 999px; background: var(--soft); color: var(--ink); font-size: .82rem; font-weight: 700; overflow-wrap: anywhere; }
.m-sub { margin: .2rem 0 0; color: var(--muted); font-size: .92rem; overflow-wrap: anywhere; }
.res { margin-top: .8rem; }
.res p { margin: 0; overflow-wrap: anywhere; }
.r-label, .p-label { font-weight: 700; color: var(--muted); font-size: .92rem; }
.r-big { font-size: clamp(1.9rem, 8vw, 2.4rem); font-weight: 800; line-height: 1.15; font-variant-numeric: tabular-nums; }
.r-line { margin-top: .1rem !important; font-variant-numeric: tabular-nums; }
.r-line.strong { font-weight: 700; margin-top: .35rem !important; }
.r-note { margin-top: .3rem !important; font-size: .9rem; color: var(--muted); }
.r-stale { margin-top: .7rem !important; font-weight: 600; color: var(--warn); }
.proj { margin-top: .8rem; padding: .7rem .85rem; border-radius: 12px; background: var(--soft); }
.p-big { font-size: 1.2rem; font-weight: 800; line-height: 1.25; font-variant-numeric: tabular-nums; }
.p-note { margin-top: .2rem !important; font-size: .9rem; color: var(--muted); font-variant-numeric: tabular-nums; }
.limit { margin-top: .6rem; padding: .7rem .85rem; border-radius: 12px; border: 2px solid var(--good); }
.limit.is-warn { border-color: var(--warn); }
.limit.is-over { border-color: var(--bad); }
.l-big { font-weight: 800; line-height: 1.3; }
.limit.is-over .l-big { color: var(--bad); }
.l-note { margin-top: .2rem !important; font-size: .92rem; }

.add-r { margin-top: 1rem; padding-top: .2rem; border-top: 1px solid var(--line); }
.save-r { margin-top: .8rem; }
.reads, .hist { margin-top: .4rem; }
.r-list, .h-list { display: grid; gap: .45rem; }
.r-row { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: .5rem; align-items: center; padding: .55rem .7rem; border: 1px solid var(--line); border-radius: 12px; background: var(--field); min-width: 0; }
.r-row.editing { display: block; }
.r-row.editing label:first-child { margin-top: .2rem; }
.r-main { min-width: 0; display: grid; grid-template-columns: auto minmax(0, 1fr); gap: 0 .7rem; align-items: baseline; }
.r-main p { margin: 0; overflow-wrap: anywhere; }
.r-date { color: var(--muted); font-size: .9rem; }
.r-val { font-weight: 800; font-variant-numeric: tabular-nums; }
.r-used { grid-column: 1 / -1; font-size: .88rem; color: var(--muted); font-variant-numeric: tabular-nums; }
.r-btns { display: flex; gap: .35rem; }
.h-row { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: .6rem; align-items: center; padding: .55rem .7rem; border: 1px solid var(--line); border-radius: 12px; background: var(--field); }
.h-l { min-width: 0; }
.h-l p { margin: 0; overflow-wrap: anywhere; }
.h-when { font-weight: 700; }
.h-what { font-size: .9rem; color: var(--muted); font-variant-numeric: tabular-nums; }
.h-ly { font-size: .88rem; font-weight: 600; }
.h-ly.up { color: var(--bad); } .h-ly.down { color: var(--good); }
.h-bill { margin: 0; font-weight: 800; text-align: right; font-variant-numeric: tabular-nums; max-width: 9rem; overflow-wrap: anywhere; }
.m-btns { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: .45rem; margin-top: 1rem; }
.m-btns > * { min-height: 46px; font-size: .95rem; padding: .4rem .5rem; }

/* questions */
.faq { margin-top: 1.2rem; }
.faq details { border: 1px solid var(--line); border-radius: 12px; margin: 0 0 .5rem; background: var(--card); }
.faq summary { cursor: pointer; padding: .75rem .9rem; font-weight: 600; min-height: 44px; }
.faq details p { margin: 0; padding: 0 .9rem .8rem; color: var(--muted); }
footer { margin-top: 1.4rem; text-align: center; font-size: .9rem; }
footer a { color: var(--muted); }

.back { display: inline-flex; align-items: center; gap: .4rem; min-height: 44px; margin: 0 0 .5rem; padding: 0 1rem 0 .8rem; border: 1px solid var(--line, rgba(127,127,127,.4)); border-radius: 999px; color: var(--muted, var(--mut, inherit)); font-size: .92rem; font-weight: 600; text-decoration: none; background: transparent; }
.back:hover { color: var(--ink, inherit); border-color: currentColor; }
.back:focus-visible { outline: 3px solid var(--accent, var(--acc, #fff)); outline-offset: 2px; }

/* narrow phones */
@media (max-width: 400px) {
    .card { padding: .95rem .85rem; }
    .meter { padding: .9rem .75rem 1rem; }
    .sub-box { padding: .2rem .6rem .8rem; }
    .step { padding: .2rem .55rem .6rem; }
}
@media (max-width: 439px) {
    .unit-day { grid-template-columns: minmax(0, 1fr); gap: 0; }
}
@media (max-width: 359px) {
    .tool-grid, .m-btns { grid-template-columns: minmax(0, 1fr); }
    .two, .step-g { grid-template-columns: minmax(0, 1fr); gap: 0; }
    .r-row { grid-template-columns: minmax(0, 1fr); }
}
@media (max-width: 360px) {
    .topbar .theme-toggle { padding: 0; width: 44px; justify-content: center; }
    .topbar .theme-toggle span { display: none; }
}

/* laptops and desktops: the form and settings on the left, the meters on the right */
@media (min-width: 900px) {
    .app { width: min(1160px, 100%); display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.3fr); column-gap: 1.5rem; align-items: start; }
    .app > * { grid-column: 1 / -1; }
    .col-a, .col-b { display: block; min-width: 0; }
    .app > .topbar { grid-row: 1; }
    .app > header { grid-row: 2; }
    .app > .warn { grid-row: 3; }
    .app > .col-a { grid-column: 1; grid-row: 4; }
    .app > .col-b { grid-column: 2; grid-row: 4; }
    .app > .faq { grid-row: 5; width: min(760px, 100%); justify-self: center; }
    .app > footer { grid-row: 6; width: min(760px, 100%); justify-self: center; }
    header h1 { font-size: 2.2rem; }
    header .sub { max-width: 760px; margin-left: auto; margin-right: auto; }
    .m-btns { grid-template-columns: repeat(4, minmax(0, 1fr)); }
    .meter { padding: 1.2rem 1.4rem 1.3rem; }
}