:root {
  color-scheme: light;
  font-family: "Segoe UI", "Microsoft YaHei", system-ui, sans-serif;
  color: #18362e;
  background: #f4f7f4;
  font-synthesis: none;
}

* { box-sizing: border-box; }
body { margin: 0; }
button, input, select { font: inherit; }
button, select { cursor: pointer; }
a { color: inherit; }
:focus-visible { outline: 3px solid #80bf9b; outline-offset: 3px; }

.page-shell { max-width: 1160px; margin: 0 auto; padding: 26px 32px 28px; }
.site-header { display: flex; justify-content: space-between; align-items: center; gap: 24px; }
.brand { display: inline-flex; align-items: center; gap: 11px; text-decoration: none; white-space: nowrap; }
.brand-mark { position: relative; display: grid; place-items: center; width: 42px; height: 42px; border-radius: 14px; background: #0e5841; color: #fff; font-size: 26px; font-weight: 800; letter-spacing: -3px; padding-right: 3px; }
.brand-drop { position: absolute; width: 5px; height: 8px; right: 8px; bottom: 7px; background: #bfe7ce; border-radius: 50% 50% 50% 0; transform: rotate(-30deg); }
.brand-name { display: flex; flex-direction: column; font-size: 22px; line-height: 1.05; font-weight: 760; letter-spacing: -.04em; }
.brand-name small { margin-top: 4px; color: #688073; font-size: 11px; font-weight: 500; letter-spacing: .13em; }
.header-controls { display: flex; gap: 10px; }
.select-wrap { display: flex; flex-direction: column; gap: 4px; color: #698074; font-size: 11px; }
.select-wrap select { min-height: 40px; padding: 8px 30px 8px 11px; border: 1px solid #d8e4da; border-radius: 10px; background: #fff; color: #1b3b30; font-size: 13px; font-weight: 620; }

.page-intro { padding: 55px 0 31px; }
.eyebrow, .card-kicker { margin: 0; color: #54846b; font-size: 12px; font-weight: 700; letter-spacing: .13em; }
.page-intro h1 { margin: 11px 0 13px; font-size: clamp(35px, 5vw, 57px); line-height: 1.18; letter-spacing: -.065em; }
.page-intro h1 span { color: #458667; }
.page-intro > p:last-child { margin: 0; color: #697d70; font-size: 14px; line-height: 1.7; }
.dashboard-grid { display: grid; grid-template-columns: 1.15fr .85fr; gap: 16px; align-items: stretch; }
.card, .price-card { min-width: 0; border-radius: 20px; box-shadow: 0 10px 30px rgba(27, 68, 43, .035); }
.card { padding: 24px; border: 1px solid #dce8dd; background: #fff; }
.price-card { padding: 26px 28px 23px; background: linear-gradient(145deg, #155e46, #0d4938); color: #f9fff9; }
.card-topline, .section-heading { display: flex; align-items: flex-start; justify-content: space-between; gap: 12px; }
.price-card .card-kicker { color: #bce4ca; }
.price-card h2 { display: flex; align-items: baseline; gap: 12px; flex-wrap: wrap; margin: 8px 0 0; font-size: 18px; font-weight: 640; }
.price-card h2 span + span { padding-left: 12px; border-left: 1px solid #8fc8a780; color: #d6ecde; font-size: 13px; font-weight: 520; }
.price-status { padding: 6px 9px; border: 1px solid #acd2b878; border-radius: 99px; color: #dff3e5; font-size: 11px; white-space: nowrap; }
.price-status.stale { border-color: #ffd8a8; color: #ffe1b8; }
.main-price { display: flex; align-items: baseline; gap: 12px; margin: 20px 0 4px; }
.main-price strong { font-size: clamp(62px, 8vw, 86px); font-weight: 740; letter-spacing: -.07em; line-height: 1; font-variant-numeric: tabular-nums; }
.main-price span { color: #d1ead9; font-size: 15px; }
.price-detail { min-height: 20px; margin: 8px 0 24px; color: #d3eadc; font-size: 13px; line-height: 1.5; }
.sync-note { margin: -13px 0 18px; color: #b8dac4; font-size: 11px; line-height: 1.5; }
.price-card-bottom { display: flex; justify-content: space-between; gap: 18px; padding-top: 16px; border-top: 1px solid #ffffff38; }
.price-card-bottom div { display: flex; flex-direction: column; gap: 5px; }
.price-card-bottom span { color: #b7d8c3; font-size: 11px; }
.price-card-bottom strong, .price-card-bottom a { font-size: 12px; font-weight: 570; }
.price-card-bottom a { text-underline-offset: 3px; }
.latest-notice { margin: 16px 0 0; padding-top: 14px; border-top: 1px solid #ffffff38; font-size: 12px; line-height: 1.7; overflow-wrap: anywhere; }
.latest-notice span { display: block; margin-bottom: 3px; color: #b7d8c3; font-size: 11px; }
.latest-notice a { text-underline-offset: 3px; }
.section-heading h2 { margin: 6px 0 0; font-size: 22px; line-height: 1.25; letter-spacing: -.035em; }
.adjustment-pair { display: grid; grid-template-columns: 1fr 1fr; margin-top: 31px; }
.adjustment-pair > div { display: flex; flex-direction: column; gap: 7px; min-width: 0; }
.adjustment-pair > div + div { padding-left: 18px; border-left: 1px solid #e0eae1; }
.adjustment-pair span { color: #718779; font-size: 12px; }
.adjustment-pair strong { font-size: 18px; line-height: 1.3; }
.prediction-value { display: inline-flex; align-items: baseline; gap: 7px; }
.prediction-value.stale span { color: #66736b; font-weight: 500; }
.prediction-arrow { flex: none; font-size: 24px; line-height: 1; font-weight: 800; }
.prediction-arrow.down { color: #21815b; }
.prediction-arrow.up { color: #bf5248; }
.prediction-arrow[hidden] { display: none; }
.adjustment-pair small { color: #8a9c8e; font-size: 11px; line-height: 1.5; }
#prediction-status { color: #80643a; }
.adjustment-sources { display: flex; flex-wrap: wrap; gap: 4px 10px; }
.adjustment-sources a { color: #287651; text-underline-offset: 3px; }
.adjustment-sources [hidden] { display: none; }
.card-footnote { margin: 21px 0 0; color: #839589; font-size: 11px; line-height: 1.6; }
.trip-card, .history-card { min-height: 340px; }
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin-top: 24px; }
.field { display: flex; flex-direction: column; gap: 8px; color: #63796a; font-size: 12px; }
.input-shell { display: flex; align-items: center; min-width: 0; min-height: 46px; padding: 0 12px; border: 1px solid #dbe6dd; border-radius: 11px; background: #f8faf8; }
.input-shell:focus-within { border-color: #6fac83; box-shadow: 0 0 0 3px #7ac18b22; }
.input-shell input { width: 100%; min-width: 0; padding: 10px 0; border: 0; outline: 0; background: transparent; color: #1b3c30; font-size: 18px; font-weight: 650; font-variant-numeric: tabular-nums; }
.input-shell input::placeholder { color: #a4b2a8; font-size: 13px; font-weight: 400; }
.input-shell > span { flex-shrink: 0; color: #8a9b8e; font-size: 11px; }
.price-input-heading { display: flex; justify-content: space-between; align-items: baseline; gap: 10px; margin: 17px 0 8px; color: #63796a; font-size: 12px; }
.text-button { padding: 0; border: 0; background: none; color: #287651; font-size: 11px; text-decoration: underline; text-underline-offset: 3px; }
.text-button[hidden] { display: none; }
.price-input-shell { max-width: 250px; }
.input-hint { margin: 7px 0 0; color: #8b9b90; font-size: 11px; line-height: 1.5; }
.results { display: grid; grid-template-columns: 1fr 1fr; gap: 11px; margin-top: 20px; }
.result { display: flex; flex-direction: column; gap: 4px; padding: 15px; border-radius: 13px; background: #f2f7f3; }
.result-total { background: #eaf4ed; }
.result span, .result small { color: #708778; font-size: 11px; }
.result strong { color: #194a36; font-size: clamp(27px, 4vw, 37px); line-height: 1.25; letter-spacing: -.045em; font-variant-numeric: tabular-nums; }
.calc-note { margin: 13px 0 0; color: #839589; font-size: 11px; }
.support-trigger { display: flex; align-items: center; justify-content: space-between; width: 100%; margin-top: 19px; padding: 13px 15px; border: 1px solid #cfe3d4; border-radius: 12px; background: #f2f8f3; color: #236746; font-size: 13px; font-weight: 700; text-align: left; }
.support-trigger:hover { background: #e9f4eb; }
.support-trigger span { font-size: 17px; }
.support-dialog { width: min(430px, calc(100vw - 24px)); max-height: min(92vh, 840px); padding: 22px; border: 1px solid #d7e6d9; border-radius: 20px; background: #fff; color: #18362e; box-shadow: 0 20px 70px #102e2250; overflow-y: auto; }
.support-dialog::backdrop { background: #102e2270; }
.support-head { display: flex; align-items: flex-start; justify-content: space-between; gap: 10px; }
.support-head h2 { margin: 5px 0 0; font-size: 23px; }
.support-close { width: 36px; height: 36px; border: 0; border-radius: 9px; background: #eff5f0; color: #376a4e; font-size: 26px; line-height: 1; }
.fuel-meter { height: 6px; margin-top: 16px; border-radius: 9px; background: #e9f1e9; overflow: hidden; }
.fuel-meter span { display: block; width: 100%; height: 100%; background: #3b9a65; transform: scaleX(0); transform-origin: left; }
.support-dialog[open] .fuel-meter span { animation: fuel-fill .65s ease-out forwards; }
@keyframes fuel-fill { to { transform: scaleX(1); } }
.support-description, .support-instruction { color: #617b69; font-size: 12px; line-height: 1.65; }
.support-description { margin: 15px 0; }
.support-source-link { color: #216b47; font-weight: 700; text-underline-offset: 3px; }
.support-methods { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
.support-method { padding: 9px; border: 1px solid #d9e7db; border-radius: 10px; background: #fff; color: #52705d; font-size: 13px; }
.support-method[aria-pressed="true"] { border-color: #2d8054; background: #edf7ef; color: #1d6843; font-weight: 700; }
.support-image-wrap { display: grid; place-items: center; margin-top: 12px; padding: 8px; border: 1px solid #e1e9e2; border-radius: 12px; background: #fafcfa; }
.support-image-wrap img { display: block; max-width: 100%; width: auto; height: auto; max-height: min(49vh, 490px); object-fit: contain; }
.support-instruction { margin: 10px 0; }
.support-actions { display: flex; justify-content: space-between; gap: 10px; }
.support-actions a { color: #216b47; font-size: 12px; font-weight: 650; text-underline-offset: 3px; }
@media (prefers-reduced-motion: reduce) { .support-dialog[open] .fuel-meter span { animation-duration: 0.01ms; } }
.chart-unit { color: #899d8f; font-size: 11px; }
.chart-wrap { position: relative; display: flex; align-items: center; justify-content: center; height: 206px; margin-top: 15px; overflow: hidden; border-radius: 10px; background: #fbfcfb; }
.chart-wrap svg { display: block; width: 100%; height: 100%; }
.chart-tooltip { position: absolute; top: 6px; left: clamp(var(--tooltip-half-width, 84px), var(--tooltip-x), calc(100% - var(--tooltip-half-width, 84px))); z-index: 2; display: flex; align-items: baseline; flex-wrap: wrap; justify-content: center; gap: 3px 8px; width: max-content; max-width: calc(100% - 12px); padding: 7px 10px; transform: translateX(-50%); border-radius: 8px; background: #164d37; box-shadow: 0 4px 13px #1d463528; color: #fff; font-size: 11px; white-space: nowrap; pointer-events: none; }
.chart-tooltip[hidden] { display: none; }
.chart-tooltip strong { font-size: 14px; font-variant-numeric: tabular-nums; }
.chart-empty { max-width: 260px; padding: 16px; color: #819587; font-size: 13px; line-height: 1.7; text-align: center; }
.chart-meta { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 5px 10px; margin-top: 9px; color: #8b9b8e; font-size: 11px; }
.chart-grid { stroke: #e3ebe4; stroke-width: 1; }
.chart-latest-line { stroke: #91ad9c; stroke-width: 1; stroke-dasharray: 4 5; opacity: .75; }
.chart-path { fill: none; stroke: #2b7955; stroke-width: 3; stroke-linecap: round; stroke-linejoin: round; }
.chart-point { fill: #2b7955; stroke: #fff; stroke-width: 2; }
.chart-point.unchanged { fill: #fff; stroke: #2b7955; }
.chart-point.active { fill: #124f37; stroke: #f4bd63; stroke-width: 4; }
.chart-guide { display: none; stroke: #71a98a; stroke-width: 1.5; stroke-dasharray: 4 4; }
.chart-guide.active { display: block; }
.chart-hit-layer { position: absolute; inset: 0; z-index: 1; display: flex; }
.chart-hit { flex: none; height: 100%; padding: 0; border: 0; background: transparent; cursor: crosshair; }
.chart-hit:focus-visible { outline: none; }
.chart-text { fill: #7e9282; font-size: 10px; font-family: inherit; }
.chart-value { fill: #236746; font-size: 13px; font-weight: 700; font-family: inherit; }
.data-notes { max-width: 850px; padding: 28px 0 8px; }
.data-notes h2 { margin: 0 0 8px; font-size: 15px; }
.data-notes p { margin: 7px 0; color: #798e7f; font-size: 12px; line-height: 1.7; }
.site-footer { display: flex; justify-content: space-between; gap: 16px; padding: 25px 0 0; border-top: 1px solid #dbe7dd; color: #8a9c8d; font-size: 11px; }

@media (max-width: 800px) {
  .page-shell { max-width: 540px; padding: 18px 16px 25px; }
  .page-intro { padding: 42px 2px 27px; }
  .dashboard-grid { grid-template-columns: 1fr; gap: 12px; }
  .card { padding: 21px; }
  .price-card { padding: 23px; }
  .trip-card, .history-card { min-height: 0; }
}

@media (max-width: 440px) {
  .site-header { align-items: flex-start; gap: 8px; }
  .brand-mark { width: 35px; height: 35px; border-radius: 11px; font-size: 22px; }
  .brand-name { font-size: 19px; }
  .header-controls { gap: 5px; }
  .select-wrap { font-size: 10px; }
  .select-wrap select { max-width: 112px; min-height: 35px; padding: 5px 16px 5px 5px; font-size: 11px; }
  .location-select select { max-width: 90px; }
  .page-intro h1 { font-size: 36px; }
  .adjustment-pair { gap: 8px; }
  .adjustment-pair > div + div { padding-left: 12px; }
  .adjustment-pair strong { font-size: 15px; }
  .price-card h2 { font-size: 16px; }
  .price-card h2 span + span { font-size: 12px; }
  .main-price strong { font-size: 64px; }
  .site-footer { flex-direction: column; gap: 5px; }
}