:root {
  --color-primary: #174777;
  --color-primary-dark: #082a4d;
  --color-primary-soft: #edf4fa;
  --color-accent: #b32632;
  --color-ink: #10213a;
  --color-muted: #627189;
  --color-line: #dce4ef;
  --color-surface: #f5f7fb;
  --color-success: #16865a;
  --radius: 18px;
  --shadow: 0 18px 48px rgba(25, 49, 89, 0.09);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--color-ink);
  background: #fff;
  font-family: "Microsoft YaHei", "PingFang SC", system-ui, sans-serif;
  line-height: 1.65;
}
button, input, select { font: inherit; }
a { color: inherit; text-decoration: none; }
button, a, select, input, summary { outline: none; }
button:focus-visible, a:focus-visible, select:focus-visible, input:focus-visible, summary:focus-visible {
  box-shadow: 0 0 0 4px rgba(23, 72, 199, 0.18);
  border-radius: 8px;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 64px;
  padding: 0 max(24px, calc((100vw - 1180px) / 2));
  color: #fff;
  background: rgba(8, 42, 77, 0.98);
  border-bottom: 3px solid var(--color-accent);
  backdrop-filter: blur(12px);
}
.brand, .site-header nav { display: flex; align-items: center; gap: 22px; }
.brand { color: #fff; font-weight: 800; letter-spacing: 0.04em; }
.brand-logo { display: block; width: 120px; height: 41px; object-fit: contain; }
.site-header nav a { color: #dce8f3; font-size: 14px; }
.site-header nav a:hover { color: #fff; }

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 11px 18px;
  border: 1px solid transparent;
  border-radius: 11px;
  font-weight: 700;
  cursor: pointer;
  transition: transform 160ms ease, background 160ms ease, border-color 160ms ease;
}
.button:hover { transform: translateY(-1px); }
.button-primary { color: #fff; background: var(--color-accent); }
.button-primary:hover { background: #8f1f29; }
.button-ghost { color: var(--color-primary); background: #fff; border-color: var(--color-line); }
.button-large { min-height: 50px; padding-inline: 26px; }

.hero { padding: 54px max(24px, calc((100vw - 1180px) / 2)) 54px; background: linear-gradient(180deg, #f6f9fc 0%, #fff 100%); }
.hero-inner { max-width: 1180px; margin: 0 auto; }
.hero-heading { max-width: 800px; }
.eyebrow { margin: 0; color: var(--color-primary); font-size: 13px; font-weight: 800; letter-spacing: 0.12em; }
h1 { max-width: 760px; margin: 10px 0; font-size: clamp(38px, 5vw, 56px); line-height: 1.12; letter-spacing: -0.035em; }
.hero-copy { max-width: 720px; margin: 0; color: var(--color-muted); font-size: 18px; }
.trust-list { display: flex; gap: 22px; padding: 0; margin: 22px 0 38px; color: var(--color-muted); list-style: none; font-size: 14px; }
.trust-list li::before { content: "✓"; margin-right: 7px; color: var(--color-success); font-weight: 900; }
.hero-workbench { padding: 26px; background: #fff; border: 1px solid #ced9e6; border-top: 4px solid var(--color-accent); border-radius: 8px; box-shadow: var(--shadow); }
.step-label { display: flex; align-items: center; gap: 9px; margin: 0 0 12px; font-size: 14px; font-weight: 800; }
.step-label:not(:first-child) { margin-top: 24px; }
.step-label span { display: grid; place-items: center; width: 24px; height: 24px; color: #fff; background: var(--color-primary); border-radius: 50%; font-size: 12px; }
.step-help { margin-left: auto; color: var(--color-muted); font-size: 12px; font-weight: 400; }
.system-grid { width: 100%; }
.type-options { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; }
.type-options button {
  display: grid;
  gap: 2px;
  padding: 15px 16px;
  color: var(--color-muted);
  text-align: left;
  background: #fff;
  border: 1px solid var(--color-line);
  border-radius: 6px;
  cursor: pointer;
}
.type-options button b { color: var(--color-ink); font-size: 17px; line-height: 1.35; }
.type-options button small { font-size: 12px; }
.type-options button span { margin-top: 7px; color: var(--color-accent); font-size: 20px; font-weight: 800; }
.type-options button.is-active { color: var(--color-primary); background: var(--color-primary-soft); border-color: var(--color-primary); box-shadow: inset 0 0 0 1px var(--color-primary); }
.type-options button.is-active b { color: var(--color-primary); }
.hero-versions { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 14px; }
.hero-version-card {
  position: relative;
  display: flex;
  flex-direction: column;
  min-width: 0;
  padding: 22px;
  background: #f8fafc;
  border: 1px solid var(--color-line);
  border-radius: 8px;
  cursor: pointer;
  transition: border-color 160ms ease, background 160ms ease, box-shadow 160ms ease, transform 160ms ease;
}
.hero-version-card:hover { transform: translateY(-2px); border-color: #8aa7c6; }
.hero-version-card.is-recommended { border-color: #9bb3cc; }
.hero-version-card.is-selected { background: var(--color-primary-soft); border-color: var(--color-primary); box-shadow: inset 0 0 0 1px var(--color-primary); }
.hero-version-card:focus-visible { box-shadow: 0 0 0 4px rgba(23, 71, 119, 0.18); }
.card-badges { position: absolute; top: 14px; right: 14px; display: flex; gap: 6px; }
.recommend-badge,
.selected-badge {
  padding: 3px 9px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 700;
}
.recommend-badge { color: var(--color-primary); background: #d9e8f7; }
.selected-badge { color: #fff; background: var(--color-primary); }
.version-fit { max-width: calc(100% - 58px); margin: 0; color: var(--color-success); font-size: 13px; font-weight: 700; }
.hero-version-card h2 { margin: 8px 0 2px; font-size: 23px; line-height: 1.35; letter-spacing: -0.02em; }
.version-price { margin: 8px 0 14px; color: var(--color-accent); font-size: 30px; font-weight: 800; }
.hero-version-card dl { display: grid; gap: 8px; margin: 0 0 18px; }
.hero-version-card dl div { min-width: 0; }
.hero-version-card dd { overflow-wrap: anywhere; }
.hero-version-card .button { margin-top: auto; }
dt { color: var(--color-muted); font-size: 12px; }
dd { margin: 3px 0 0; font-weight: 800; font-size: 14px; }

.proof-strip { display: grid; grid-template-columns: repeat(4, 1fr); max-width: 1180px; margin: 0 auto; padding: 28px 24px; border-bottom: 1px solid var(--color-line); }
.proof-strip div { display: grid; gap: 2px; padding: 0 22px; border-right: 1px solid var(--color-line); }
.proof-strip div:last-child { border: 0; }
.proof-strip strong { font-size: 14px; }
.proof-strip span { color: var(--color-muted); font-size: 12px; }

.section { max-width: 1180px; margin: auto; padding: 82px 24px; }
.section-heading { max-width: 700px; margin-bottom: 32px; }
.section-heading h2 { margin: 8px 0; font-size: clamp(30px, 4vw, 46px); line-height: 1.2; letter-spacing: -0.035em; }
.section-heading > p:last-child, .section-heading-row > p { color: var(--color-muted); }
.section-heading-row { display: flex; max-width: none; align-items: end; justify-content: space-between; gap: 60px; }
.section-heading-row > p { max-width: 400px; }

.selector-panel { display: grid; grid-template-columns: 0.85fr 1.15fr; gap: 18px; padding: 28px; border: 1px solid var(--color-line); border-radius: 22px; background: #fff; box-shadow: var(--shadow); }
.selector-fields { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; align-content: start; }
label { display: grid; gap: 8px; color: var(--color-muted); font-size: 14px; }
select, input { width: 100%; min-height: 48px; padding: 12px 14px; color: var(--color-ink); background: #fff; border: 1px solid var(--color-line); border-radius: 10px; }
#recommendation { align-self: start; padding: 22px; background: var(--color-primary-soft); border: 1px solid #d3e0ff; border-radius: 16px; }
#recommendation h3 { margin: 7px 0; font-size: 24px; }
#recommendation p:not(.eyebrow) { color: var(--color-muted); }
.recommendation-summary { margin-bottom: 18px; }
.recommendation-summary > p:last-child { margin: 0; }
.recommend-options { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; }
.recommend-option { display: flex; min-width: 0; flex-direction: column; padding: 18px; background: #fff; border: 1px solid #d7e2ee; border-radius: 12px; }
.recommend-option.is-expanded { grid-column: 1 / -1; border-color: var(--color-primary); box-shadow: inset 0 0 0 1px var(--color-primary); }
.recommend-option.is-compact { grid-column: 1 / -1; flex-direction: row; align-items: center; justify-content: space-between; gap: 18px; min-height: 88px; padding: 14px 16px; cursor: pointer; }
.recommend-option.is-compact:hover { border-color: #9eb7d4; background: #fbfdff; }
.recommend-option.is-compact h4 { margin: 4px 0 0; font-size: 17px; line-height: 1.35; }
.recommend-option-heading { display: flex; align-items: flex-start; justify-content: space-between; gap: 12px; }
.recommend-option-heading h4 { margin: 5px 0 0; font-size: 20px; line-height: 1.35; }
.recommend-fit { margin: 10px 0 16px; }
.recommend-details { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; margin: 0 0 18px; }
.recommend-details div { min-width: 0; padding: 10px; background: #f7f9fc; border: 1px solid #e1e8f1; border-radius: 9px; }
.recommend-details dd { overflow-wrap: anywhere; }
.recommend-details div:last-child dd { color: var(--color-accent); font-size: 18px; }
.recommend-option .button { align-self: flex-start; margin-top: auto; }
.compact-actions { display: flex; flex: 0 0 auto; align-items: center; gap: 10px; }
.compact-price { color: var(--color-accent); font-size: 22px; }
.recommend-option.is-compact .button { align-self: center; margin: 0; padding: 8px 14px; white-space: nowrap; }

.products-section { padding-top: 40px; }
.product-tabs { display: flex; gap: 10px; margin-bottom: 20px; flex-wrap: wrap; }
.product-tabs button { padding: 10px 17px; color: var(--color-muted); background: #fff; border: 1px solid var(--color-line); border-radius: 999px; cursor: pointer; }
.product-tabs button.is-active { color: #fff; background: var(--color-primary); border-color: var(--color-primary); }
.product-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.product-card { display: flex; min-width: 0; flex-direction: column; padding: 20px; border: 1px solid var(--color-line); border-radius: var(--radius); background: #fff; transition: transform 160ms ease, box-shadow 160ms ease; }
.product-card:hover { transform: translateY(-3px); box-shadow: var(--shadow); }
.product-card h3 { margin: 8px 0 2px; font-size: 20px; line-height: 1.4; }
.product-card > p:not(.eyebrow) { min-height: 48px; margin: 0; color: var(--color-muted); font-size: 14px; }
.product-card .price { margin: 18px 0; font-size: 32px; font-weight: 800; color: var(--color-primary); }
.product-card .price small { margin-left: 5px; color: var(--color-muted); font-size: 12px; font-weight: 400; }
.product-card ul { padding-left: 18px; color: var(--color-muted); flex: 1; font-size: 13px; }

.process-wrap { background: var(--color-surface); }
.process ol { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; padding: 0; list-style: none; }
.process li { display: grid; gap: 25px; padding: 24px; background: #fff; border: 1px solid var(--color-line); border-radius: var(--radius); }
.process b { color: var(--color-primary); font-size: 30px; }
.process li span { display: grid; gap: 4px; }
.process small { color: var(--color-muted); }

.faq-grid { border-top: 1px solid var(--color-line); }
.faq details { padding: 20px 4px; border-bottom: 1px solid var(--color-line); }
.faq summary { position: relative; padding-right: 38px; font-weight: 800; cursor: pointer; list-style: none; }
.faq summary::after { content: "+"; position: absolute; right: 8px; top: -6px; color: var(--color-primary); font-size: 28px; font-weight: 400; }
.faq details[open] summary::after { content: "−"; }
.faq details p { max-width: 820px; margin: 12px 0 0; color: var(--color-muted); }

.final-cta { display: flex; align-items: center; justify-content: space-between; gap: 32px; max-width: 1132px; margin: 0 auto 82px; padding: 36px; color: #fff; background: var(--color-primary-dark); border-radius: 22px; }
.final-cta .eyebrow { color: #a9c0ff; }
.final-cta h2 { margin: 7px 0 0; font-size: clamp(26px, 4vw, 38px); }

footer { display: grid; grid-template-columns: 2fr 1fr auto; gap: 32px; padding: 46px max(24px, calc((100vw - 1180px) / 2)); color: #dce7ff; background: #10213a; }
footer p { margin: 8px 0 0; color: #9eb0cb; }
.footer-links { display: grid; gap: 8px; }
footer button { padding: 0; color: inherit; text-align: left; background: none; border: 0; cursor: pointer; }

dialog { width: min(520px, calc(100% - 32px)); padding: 0; border: 0; border-radius: 20px; box-shadow: 0 30px 80px rgba(0, 0, 0, 0.24); }
dialog::backdrop { background: rgba(10, 24, 46, 0.55); }
dialog form { position: relative; display: grid; gap: 18px; padding: 30px; }
dialog h2 { margin: 0; }
dialog p { margin: 0; color: var(--color-muted); }
.dialog-close { position: absolute; top: 16px; right: 16px; width: 36px; height: 36px; background: var(--color-surface); border: 0; border-radius: 50%; cursor: pointer; }
.dialog-note { padding: 13px; color: var(--color-muted); background: var(--color-surface); border-radius: 10px; font-size: 13px; }

@media (max-width: 900px) {
  .site-header nav a { display: none; }
  .hero { padding-top: 48px; }
  .type-options { grid-template-columns: 1fr 1fr; }
  .selector-panel { grid-template-columns: 1fr; }
  .product-grid { grid-template-columns: repeat(2, 1fr); }
  .section-heading-row { display: block; }
  .process ol { grid-template-columns: 1fr 1fr; }
  .proof-strip { grid-template-columns: 1fr 1fr; row-gap: 24px; }
  .proof-strip div:nth-child(2) { border-right: 0; }
  footer { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 620px) {
  .site-header { min-height: 64px; padding-inline: 16px; }
  .site-header nav { gap: 8px; }
  .site-header .button { padding-inline: 12px; }
  .hero, .section { padding-left: 16px; padding-right: 16px; }
  .hero { padding-top: 38px; padding-bottom: 34px; }
  h1 { font-size: 42px; }
  .hero-copy { font-size: 16px; }
  .trust-list { display: grid; gap: 6px; }
  .step-help { display: none; }
  .hero-workbench { padding: 16px; margin-inline: -4px; }
  .type-options { grid-template-columns: 1fr 1fr; }
  .hero-versions { grid-template-columns: 1fr; }
  .proof-strip { grid-template-columns: 1fr; padding-inline: 16px; }
  .proof-strip div { padding: 0; border-right: 0; }
  .selector-fields, .process ol { grid-template-columns: 1fr; }
  .product-grid { grid-template-columns: 1fr; }
  .recommend-options { grid-template-columns: 1fr; }
  .recommend-option,
  .recommend-option.is-expanded { grid-column: auto; }
  .recommend-option.is-compact { flex-wrap: wrap; }
  .recommend-details { grid-template-columns: 1fr; }
  .section { padding-top: 62px; padding-bottom: 62px; }
  .final-cta { display: grid; margin: 0 16px 62px; padding: 26px; }
  footer { grid-template-columns: 1fr; padding-inline: 20px; }
}

@media (max-width: 390px) {
  .brand > span:last-child { display: none; }
  h1 { font-size: 38px; }
}

/* 生产首页：主体说明、实时数据状态与搜索意图内容 */
.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 30;
  padding: 10px 14px;
  color: #fff;
  background: var(--color-primary-dark);
  border-radius: 8px;
  transform: translateY(-150%);
}
.skip-link:focus { transform: translateY(0); }

.identity-note {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 12px;
  max-width: 760px;
  margin-top: 20px;
  padding: 14px 16px;
  color: #44566f;
  background: #f0f5f9;
  border-left: 3px solid var(--color-primary);
}
.identity-note strong { color: var(--color-primary-dark); white-space: nowrap; }
.identity-note p { margin: 0; font-size: 14px; }

.storefront-status {
  margin-bottom: 14px;
  padding: 13px 16px;
  color: var(--color-muted);
  background: #f5f8fb;
  border: 1px solid var(--color-line);
  border-radius: 8px;
  font-size: 14px;
}
.storefront-status.is-error { color: #8e2630; background: #fff3f4; border-color: #e9c6ca; }
.storefront-status.is-empty { color: #6a5920; background: #fff9e9; border-color: #e8dba8; }
.storefront-empty {
  grid-column: 1 / -1;
  width: 100%;
  padding: 28px;
  color: var(--color-muted);
  text-align: center;
  background: #f8fafc;
  border: 1px dashed #b9c7d7;
  border-radius: 10px;
}
.storefront-empty strong { display: block; margin-bottom: 3px; color: var(--color-ink); }
.storefront-empty p { margin: 0; }

.product-skeleton {
  min-height: 250px;
  border: 1px solid #e3e9f0;
  border-radius: 8px;
  background: linear-gradient(100deg, #edf1f5 20%, #f8fafc 38%, #edf1f5 56%);
  background-size: 220% 100%;
  animation: skeleton-loading 1.35s ease-in-out infinite;
}
.product-skeleton-wide { min-height: 260px; }
@keyframes skeleton-loading {
  from { background-position: 100% 0; }
  to { background-position: -100% 0; }
}

.search-guide { padding-top: 54px; }
.guide-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.guide-grid article {
  padding: 26px;
  background: #f6f8fb;
  border-top: 3px solid var(--color-primary);
}
.guide-grid article > span { color: var(--color-accent); font-size: 13px; font-weight: 800; letter-spacing: 0.12em; }
.guide-grid h3 { margin: 14px 0 7px; font-size: 20px; }
.guide-grid p { margin: 0; color: var(--color-muted); font-size: 14px; }

[hidden] { display: none !important; }

@media (max-width: 900px) {
  .guide-grid { grid-template-columns: 1fr; }
}

@media (max-width: 620px) {
  .identity-note { grid-template-columns: 1fr; gap: 3px; }
  .storefront-status { font-size: 13px; }
  .product-skeleton { min-height: 190px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    scroll-behavior: auto !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
}