:root {
  color-scheme: light dark;
  --canvas: #f4f7f7;
  --surface: #ffffff;
  --surface-muted: #eef4f3;
  --ink: #172d34;
  --ink-soft: #60747a;
  --line: #d6e1e1;
  --accent: #0d746c;
  --accent-deep: #0b4d4a;
  --accent-soft: #d9eeea;
  --result: #133038;
  --error: #a6473e;
  --radius: 12px;
  --shadow: 0 14px 38px rgb(24 55 61 / 0.06);
  font-family: "Microsoft YaHei UI", "Microsoft YaHei", system-ui, sans-serif;
}

* { box-sizing: border-box; }
html { background: var(--canvas); }
body { margin: 0; color: var(--ink); background: var(--canvas); font-size: 16px; line-height: 1.55; }
button, input, select { font: inherit; }
button { cursor: pointer; }
button:disabled { cursor: wait; opacity: 0.66; }
input, select { width: 100%; min-height: 44px; padding: 0.55rem 0.7rem; border: 1px solid var(--line); border-radius: 8px; color: var(--ink); background: var(--surface); }
input::placeholder { color: #7c9094; }
input:focus, select:focus, button:focus-visible { outline: 3px solid rgb(13 116 108 / 0.23); outline-offset: 2px; border-color: var(--accent); }
h1, h2, h3, p { margin-top: 0; }
h1, h2, h3, strong { letter-spacing: -0.025em; }
h1 { margin-bottom: 0.5rem; font-size: clamp(2rem, 4vw, 3.25rem); line-height: 1.12; }
h2 { margin-bottom: 0.25rem; font-size: clamp(1.45rem, 2.5vw, 2rem); line-height: 1.24; }
h3 { margin-bottom: 0.7rem; font-size: 1.02rem; line-height: 1.35; }
.skip-link { position: fixed; z-index: 10; top: -3rem; left: 1rem; padding: 0.5rem 0.75rem; border-radius: 8px; color: #fff; background: var(--accent); }
.skip-link:focus { top: 1rem; }
.header-inner, .page-shell, .site-footer { width: min(1080px, calc(100% - 2rem)); margin: 0 auto; }
.site-header { border-bottom: 1px solid var(--line); background: color-mix(in srgb, var(--surface) 94%, transparent); }
.header-inner { display: flex; align-items: center; justify-content: space-between; min-height: 62px; }
.brand { display: inline-flex; align-items: center; gap: 0.62rem; color: inherit; text-decoration: none; }
.brand-mark { display: grid; width: 31px; height: 31px; place-items: center; border-radius: 9px; color: #fff; background: var(--accent-deep); font-size: 0.7rem; font-weight: 800; letter-spacing: 0.06em; }
.brand strong, .brand small { display: block; }
.brand strong { font-size: 0.95rem; }
.brand small, .header-note { color: var(--ink-soft); font-size: 0.67rem; letter-spacing: 0.055em; }
.header-note { margin: 0; }
.page-shell { padding: clamp(1.75rem, 4vw, 3.4rem) 0; }
.intro { display: grid; grid-template-columns: minmax(0, 1fr) 285px; gap: 2.4rem; align-items: center; margin-bottom: 1.7rem; }
.intro-copy > p:not(.eyebrow) { max-width: 43rem; margin-bottom: 0.8rem; color: var(--ink-soft); }
.eyebrow { margin-bottom: 0.42rem; color: var(--accent); font-size: 0.67rem; font-weight: 800; letter-spacing: 0.13em; }
.service-status { display: inline-flex; min-height: 28px; align-items: center; padding: 0.25rem 0.55rem; border: 1px solid var(--line); border-radius: 999px; color: var(--ink-soft); font-size: 0.76rem; }
.service-status.is-online { border-color: #bcded8; color: var(--accent-deep); background: var(--accent-soft); }
.service-status.is-offline { border-color: #efc9c4; color: var(--error); background: #fff2f0; }
.contact-panel { display: grid; grid-template-columns: 104px minmax(0, 1fr); gap: 0.9rem; align-items: center; padding: 0.75rem; border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); box-shadow: var(--shadow); }
.contact-panel img { display: block; width: 104px; height: 104px; border-radius: 6px; image-rendering: auto; }
.contact-panel p { margin-bottom: 0; color: var(--ink-soft); font-size: 0.8rem; line-height: 1.5; }
.contact-panel .contact-title { margin-bottom: 0.28rem; color: var(--ink); font-size: 0.93rem; font-weight: 800; }
.tool-layout { display: block; }
.tool-nav { display: flex; gap: 1.3rem; margin-bottom: 1.3rem; padding: 0 0 0.55rem; border-bottom: 1px solid var(--line); }
.tool-tab { position: relative; padding: 0.2rem 0; border: 0; color: var(--ink-soft); background: transparent; text-align: left; }
.tool-tab span { display: block; font-weight: 800; }
.tool-tab small { display: none; }
.tool-tab::after { position: absolute; right: 0; bottom: -0.6rem; left: 0; height: 2px; content: ""; background: transparent; }
.tool-tab:hover, .tool-tab.is-active { color: var(--accent-deep); }
.tool-tab.is-active::after { background: var(--accent); }
.tool-panel { min-width: 0; }
.panel-heading { display: flex; justify-content: space-between; gap: 1rem; margin-bottom: 1.15rem; }
.panel-heading > div > p:last-child, .customer-quote > div:first-child > p { max-width: 48rem; margin-bottom: 0; color: var(--ink-soft); }
.search-form, .lookup-form { padding: 1rem; border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); box-shadow: var(--shadow); }
.search-form > label, .field-group > label, .field-group > legend { display: block; margin-bottom: 0.35rem; color: var(--ink); font-size: 0.85rem; font-weight: 800; }
.search-controls { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 0.5rem; }
.button { min-height: 44px; padding: 0.5rem 0.85rem; border: 1px solid transparent; border-radius: 8px; font-size: 0.9rem; font-weight: 800; white-space: nowrap; }
.button-primary { border-color: var(--accent); color: #fff; background: var(--accent); }
.button-primary:hover { border-color: var(--accent-deep); background: var(--accent-deep); }
.button-secondary { border-color: var(--line); color: var(--accent-deep); background: var(--surface); }
.button-secondary:hover { border-color: var(--accent); color: var(--accent-deep); background: var(--accent-soft); }
.field-help { margin: 0.32rem 0 0; color: var(--ink-soft); font-size: 0.76rem; }
.inline-status { min-height: 1.45rem; margin: 0.75rem 0; color: var(--ink-soft); font-size: 0.85rem; }
.inline-status.is-error { color: var(--error); }
.vehicle-results { display: grid; gap: 0; max-height: 280px; overflow: auto; border-top: 1px solid var(--line); }
.vehicle-result { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 1rem; width: 100%; padding: 0.85rem 0.35rem; border: 0; border-bottom: 1px solid var(--line); color: var(--ink); background: transparent; text-align: left; }
.vehicle-result:hover, .vehicle-result.is-selected { color: var(--accent-deep); background: linear-gradient(90deg, var(--accent-soft), transparent 72%); }
.vehicle-result strong, .vehicle-result span { display: block; }
.vehicle-result span { color: var(--ink-soft); font-size: 0.8rem; }
.vehicle-result .price { align-self: center; color: var(--accent-deep); font-weight: 800; white-space: nowrap; }
.quote-workspace { margin-top: 1.5rem; }
.selected-vehicle { padding: 1.1rem 1.2rem; border-radius: var(--radius); color: #eaf6f4; background: var(--result); }
.selected-vehicle .eyebrow { color: #9ad9d0; }
.selected-vehicle h3 { margin-bottom: 0.2rem; color: #fff; font-size: 1.15rem; }
.selected-vehicle p:last-child { margin-bottom: 0; color: #bfdbd8; }
.calculator-grid { display: grid; grid-template-columns: 0.85fr 1.15fr; gap: 1.15rem; margin-top: 1.15rem; }
.form-section { padding: 1.1rem 0; border-top: 1px solid var(--line); }
.field-group { min-width: 0; margin: 0 0 0.95rem; padding: 0; border: 0; }
.field-group:last-child { margin-bottom: 0; }
.choice-grid { display: grid; gap: 0.38rem; }
.choice-grid label { display: flex; align-items: center; gap: 0.42rem; min-height: 38px; padding: 0.35rem 0.45rem; border: 1px solid var(--line); border-radius: 8px; color: var(--ink-soft); font-size: 0.82rem; }
.choice-grid label:has(input:checked) { border-color: #9ccfc7; color: var(--accent-deep); background: var(--accent-soft); }
.choice-grid input { width: auto; min-height: auto; margin: 0; accent-color: var(--accent); }
.input-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0.7rem; }
.input-grid .field-group { margin: 0; }
.calculation-result { margin-top: 0.65rem; padding: 1.15rem; border-radius: var(--radius); color: #e8f4f2; background: var(--result); }
.result-heading { display: flex; align-items: center; justify-content: space-between; gap: 1rem; }
.result-heading .eyebrow { margin-bottom: 0.18rem; color: #9ad9d0; }
.result-heading h3 { margin-bottom: 0; color: #fff; }
.result-heading .button-secondary { border-color: #477078; color: #eaf6f4; background: transparent; }
.result-heading .button-secondary:hover { border-color: #7ebfb6; background: #214750; }
.calculation-result .inline-status { color: #bfdbd8; }
.calculation-result .inline-status.is-error { color: #ffc2bb; }
.result-grid { display: grid; grid-template-columns: 1.4fr repeat(3, minmax(0, 1fr)); gap: 0.55rem; }
.result-card { padding: 0.78rem; border: 1px solid #3f6268; border-radius: 9px; background: #1b3d46; }
.result-card .label { display: block; margin-bottom: 0.3rem; color: #b9d2cf; font-size: 0.74rem; }
.result-card strong { display: block; color: #fff; font-size: 0.98rem; }
.result-card.primary { border-color: #7bc6bb; background: #e1f3ef; }
.result-card.primary .label { color: var(--accent-deep); }
.result-card.primary strong { color: #102f35; font-size: clamp(1.35rem, 3vw, 1.9rem); }
.result-detail { grid-column: 1 / -1; display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 0.5rem; padding-top: 0.2rem; }
.result-detail span { color: #b9d2cf; font-size: 0.73rem; }
.result-detail strong { display: block; color: #fff; font-size: 0.86rem; }
.customer-quote { display: grid; grid-template-columns: 1fr 1fr; gap: 1.15rem; margin-top: 1.15rem; padding: 1.15rem; border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); }
.customer-quote h3 { margin-bottom: 0.24rem; }
.quote-fields { display: grid; grid-template-columns: 0.7fr 1.3fr; gap: 0.7rem; }
.quote-fields .field-group { margin: 0; }
.button-row { grid-column: 1 / -1; display: flex; flex-wrap: wrap; gap: 0.55rem; }
.customer-quote > .field-help { grid-column: 1 / -1; }
.lookup-form { display: grid; grid-template-columns: minmax(0, 1fr) auto; align-items: end; gap: 0.7rem; }
.lookup-form .field-group { margin: 0; }
.lookup-form #engine-number-group { grid-column: 1 / -1; }
.lookup-result, .announcement-result { margin-top: 1rem; }
.data-card { padding: 1.05rem; border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); box-shadow: var(--shadow); }
.data-card h3 { margin-bottom: 0.65rem; }
.data-card p { margin-bottom: 0.35rem; }
.detail-list { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0.55rem 1rem; margin: 0.85rem 0; }
.detail-list div { min-width: 0; }
.detail-list dt { color: var(--ink-soft); font-size: 0.74rem; }
.detail-list dd { margin: 0.1rem 0 0; overflow-wrap: anywhere; font-weight: 800; }
.announcement-summary { margin-bottom: 0.75rem; color: var(--ink-soft); }
.factory-list { display: flex; flex-wrap: wrap; gap: 0.45rem; margin-bottom: 0.9rem; }
.factory-button { padding: 0.42rem 0.58rem; border: 1px solid var(--line); border-radius: 8px; color: var(--ink); background: var(--surface); font-size: 0.82rem; }
.factory-button.is-active, .factory-button:hover { border-color: #9ccfc7; color: var(--accent-deep); background: var(--accent-soft); }
.announcement-list { display: grid; gap: 0; border-top: 1px solid var(--line); }
.announcement-item { width: 100%; padding: 0.78rem 0.3rem; border: 0; border-bottom: 1px solid var(--line); color: var(--ink); background: transparent; text-align: left; }
.announcement-item:hover, .announcement-item.is-active { color: var(--accent-deep); background: linear-gradient(90deg, var(--accent-soft), transparent 72%); }
.announcement-item strong, .announcement-item span { display: block; }
.announcement-item span { color: var(--ink-soft); font-size: 0.79rem; }
.announcement-detail { margin-top: 0.9rem; }
.empty-state { padding: 0.9rem; border-radius: 8px; color: var(--ink-soft); background: var(--surface-muted); }
.site-footer { display: flex; justify-content: space-between; gap: 1rem; padding: 0.9rem 0 1.8rem; border-top: 1px solid var(--line); color: var(--ink-soft); font-size: 0.75rem; }
.site-footer p { margin: 0; }

@media (prefers-color-scheme: dark) {
  :root { --canvas: #102227; --surface: #152e35; --surface-muted: #19363d; --ink: #e6f0ef; --ink-soft: #b2c5c5; --line: #39575d; --accent: #65bdb2; --accent-deep: #9bdcd3; --accent-soft: #1c4849; --result: #0c2027; --error: #ffb5ab; --shadow: 0 14px 38px rgb(0 0 0 / 0.18); }
  .button-primary { color: #0c292d; }
  .service-status.is-offline { background: #4b2825; }
  .result-card.primary { background: #d7f0ea; }
}

@media (max-width: 760px) {
  .intro { grid-template-columns: 1fr; gap: 1rem; }
  .contact-panel { grid-template-columns: 82px minmax(0, 1fr); max-width: 430px; }
  .contact-panel img { width: 82px; height: 82px; }
  .calculator-grid, .customer-quote { grid-template-columns: 1fr; gap: 0.4rem; }
  .customer-quote { gap: 1rem; }
}

@media (max-width: 620px) {
  .header-inner, .site-footer { align-items: flex-start; flex-direction: column; }
  .header-inner { justify-content: center; }
  .header-note { display: none; }
  .page-shell { padding-top: 1.7rem; }
  .tool-nav { justify-content: space-between; gap: 0.5rem; margin-bottom: 1rem; }
  .tool-tab { font-size: 0.88rem; }
  .search-controls, .lookup-form, .input-grid, .quote-fields, .result-grid, .detail-list, .result-detail { grid-template-columns: 1fr; }
  .choice-grid { grid-template-columns: 1fr; }
  .result-heading { align-items: flex-start; flex-direction: column; }
  .result-heading .button, .button-row .button { width: 100%; }
  .button-row { display: grid; }
  .vehicle-result { grid-template-columns: minmax(0, 1fr) auto; }
}

@media (prefers-reduced-motion: reduce) { * { scroll-behavior: auto !important; transition: none !important; } }