:root {
  --ink: #172033;
  --muted: #667085;
  --line: #e4e7ec;
  --bg: #f6f8fb;
  --white: #fff;
  --blue: #175cd3;
  --teal: #087d7a;
  --green: #2f7d32;
  --red: #c43228;
  --gold: #a15c07;
  --shadow: 0 14px 34px rgba(16, 24, 40, .08);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--white);
  font-family: Arial, "Microsoft YaHei", sans-serif;
  line-height: 1.65;
}

a {
  color: inherit;
  text-decoration: none;
}

img {
  display: block;
  max-width: 100%;
}

.wrap {
  width: min(1180px, calc(100% - 48px));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(255, 255, 255, .94);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(12px);
}

.nav {
  display: flex;
  align-items: center;
  gap: 28px;
  height: 72px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 210px;
  font-weight: 700;
  font-size: 18px;
}

.brand-mark {
  display: inline-grid;
  place-items: center;
  width: 38px;
  height: 38px;
  color: #fff;
  background: var(--ink);
  border-radius: 8px;
  font-size: 14px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 22px;
  flex: 1;
  color: #475467;
  font-size: 15px;
}

.nav-links a:hover,
.section-head a:hover,
.text-link:hover {
  color: var(--blue);
}

.nav-action,
.full-button,
.search-box button,
.filter-search button,
.price-row a,
.buy-row a,
.service-band a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  padding: 0 18px;
  border: 0;
  border-radius: 8px;
  color: #fff;
  background: var(--blue);
  font-weight: 700;
  cursor: pointer;
}

.hero {
  background:
    linear-gradient(90deg, rgba(246, 248, 251, .96), rgba(246, 248, 251, .70)),
    #f6f8fb;
  border-bottom: 1px solid var(--line);
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, .9fr) minmax(420px, 1.1fr);
  gap: 46px;
  align-items: center;
  min-height: 560px;
  padding: 44px 0 52px;
}

.eyebrow {
  margin: 0 0 8px;
  color: var(--teal);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

.hero h1 {
  margin-bottom: 16px;
  font-size: 50px;
  line-height: 1.12;
}

.hero-desc {
  max-width: 620px;
  color: #475467;
  font-size: 18px;
}

.search-box,
.filter-search {
  display: flex;
  align-items: center;
  gap: 10px;
}

.search-box {
  max-width: 560px;
  margin: 28px 0 18px;
  padding: 8px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
}

input {
  width: 100%;
  min-height: 42px;
  padding: 0 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  color: var(--ink);
  font: inherit;
}

.search-box input {
  border: 0;
}

.trust-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  color: #344054;
  font-size: 14px;
}

.trust-row span,
.tags span,
.detail-tags span {
  padding: 4px 10px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: #fff;
}

.hero-visual {
  min-width: 0;
}

.hero-visual img {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.section {
  padding: 58px 0;
}

.section-alt {
  background: var(--bg);
}

.section-head {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 24px;
}

.section-head h2,
.page-title h1 {
  margin-bottom: 0;
  font-size: 32px;
  line-height: 1.2;
}

.section-head a {
  color: var(--blue);
  font-weight: 700;
}

.category-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.category-tile {
  min-height: 126px;
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
}

.category-tile span {
  display: block;
  margin-bottom: 28px;
  font-size: 22px;
  font-weight: 700;
}

.category-tile small {
  color: var(--muted);
}

.material-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
}

.material-card {
  display: flex;
  flex-direction: column;
  min-width: 0;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
}

.cover-link {
  background: #eef2f6;
}

.cover-link img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

.material-body {
  display: flex;
  flex: 1;
  flex-direction: column;
  padding: 16px;
}

.material-meta,
.price-row {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  color: var(--muted);
  font-size: 13px;
}

.material-card h3 {
  margin: 10px 0 8px;
  font-size: 18px;
  line-height: 1.35;
}

.material-card p {
  display: -webkit-box;
  min-height: 54px;
  margin-bottom: 14px;
  overflow: hidden;
  color: #475467;
  font-size: 14px;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 2;
}

.tags,
.detail-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 16px;
  color: #475467;
  font-size: 12px;
}

.price-row {
  align-items: center;
  margin-top: auto;
}

.price-row strong,
.buy-row strong {
  color: var(--red);
  font-size: 22px;
}

.price-row a {
  min-height: 36px;
  padding: 0 12px;
}

.service-band {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
  padding: 32px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
}

.service-band p {
  max-width: 760px;
  margin-bottom: 0;
  color: #475467;
}

.page-title {
  padding: 54px 0;
  background: var(--bg);
  border-bottom: 1px solid var(--line);
}

.page-title.compact {
  padding: 38px 0;
}

.page-title p:last-child {
  max-width: 720px;
  margin: 12px 0 0;
  color: var(--muted);
}

.filter-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  margin-bottom: 24px;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
}

.tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.tabs a {
  padding: 8px 13px;
  border: 1px solid var(--line);
  border-radius: 8px;
  color: #475467;
}

.tabs a.active {
  color: #fff;
  border-color: var(--ink);
  background: var(--ink);
}

.filter-search {
  width: 360px;
}

.filter-search.large {
  width: min(640px, 100%);
  margin-bottom: 24px;
}

.detail-section {
  padding: 54px 0;
  background: var(--bg);
}

.detail-grid,
.checkout-grid,
.pay-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(360px, .95fr);
  gap: 28px;
  align-items: start;
}

.detail-media,
.detail-panel,
.order-box,
.checkout-form,
.pay-panel,
.legal-content,
.detail-content,
.empty-state {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
}

.detail-media {
  overflow: hidden;
}

.detail-media img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

.detail-panel,
.checkout-form,
.pay-panel,
.legal-content,
.detail-content,
.empty-state {
  padding: 26px;
}

.detail-panel h1 {
  margin-bottom: 12px;
  font-size: 34px;
  line-height: 1.22;
}

.detail-summary {
  color: #475467;
  font-size: 16px;
}

.buy-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  margin: 22px 0;
  padding: 18px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.spec-list,
.mini-spec {
  margin: 0;
}

.spec-list div,
.mini-spec div {
  display: grid;
  grid-template-columns: 92px minmax(0, 1fr);
  gap: 16px;
  padding: 10px 0;
  border-bottom: 1px solid #eef2f6;
}

.spec-list div:last-child,
.mini-spec div:last-child {
  border-bottom: 0;
}

dt {
  color: var(--muted);
}

dd {
  min-width: 0;
  margin: 0;
  overflow-wrap: anywhere;
}

.detail-content h2,
.legal-content h2 {
  margin: 0 0 10px;
  font-size: 22px;
}

.detail-content p,
.legal-content p {
  color: #475467;
}

.order-box {
  display: grid;
  grid-template-columns: 240px minmax(0, 1fr);
  gap: 22px;
  padding: 18px;
}

.order-box img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border-radius: 8px;
}

.checkout-form {
  display: grid;
  gap: 16px;
}

.checkout-form label {
  display: grid;
  gap: 8px;
  color: #344054;
  font-weight: 700;
}

.check-line {
  grid-template-columns: 18px minmax(0, 1fr);
  align-items: start;
  font-size: 14px;
  font-weight: 400 !important;
}

.check-line input {
  width: 18px;
  min-height: 18px;
  margin-top: 4px;
}

.check-line a,
.text-link {
  color: var(--blue);
}

.alert {
  padding: 12px 14px;
  color: #7a271a;
  border: 1px solid #fecdca;
  border-radius: 8px;
  background: #fffbfa;
}

.full-button {
  width: 100%;
  min-height: 48px;
  font-size: 16px;
}

.inline-button {
  width: auto;
  margin-top: 18px;
}

.pay-grid {
  grid-template-columns: 1fr 1fr;
}

.pay-panel.accent {
  border-color: #b2ddff;
  background: #f5fbff;
}

.pay-code {
  display: grid;
  place-items: center;
  width: 170px;
  height: 170px;
  margin: 24px auto;
  color: var(--blue);
  border: 8px solid #d1e9ff;
  border-radius: 8px;
  background: #fff;
}

.pay-code span {
  font-size: 48px;
  font-weight: 800;
  line-height: 1;
}

.pay-code small {
  color: var(--muted);
  font-weight: 700;
}

.order-query {
  max-width: 780px;
}

.site-footer {
  padding: 32px 0;
  color: #d0d5dd;
  background: #111827;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 28px;
}

.site-footer p {
  margin: 8px 0 0;
  color: #98a2b3;
}

.site-footer a {
  display: block;
  margin-bottom: 8px;
  color: #f2f4f7;
}

@media (max-width: 980px) {
  .hero-grid,
  .detail-grid,
  .checkout-grid,
  .pay-grid,
  .footer-grid {
    grid-template-columns: 1fr;
  }

  .material-grid,
  .category-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .filter-bar {
    align-items: stretch;
    flex-direction: column;
  }

  .filter-search {
    width: 100%;
  }
}

@media (max-width: 720px) {
  .wrap {
    width: min(100% - 28px, 1180px);
  }

  .nav {
    height: auto;
    flex-wrap: wrap;
    padding: 14px 0;
  }

  .brand {
    min-width: 0;
  }

  .nav-links {
    order: 3;
    width: 100%;
    overflow-x: auto;
    white-space: nowrap;
  }

  .hero-grid {
    min-height: auto;
    padding: 34px 0;
  }

  .hero h1 {
    font-size: 38px;
  }

  .search-box,
  .filter-search {
    align-items: stretch;
    flex-direction: column;
  }

  .search-box button,
  .filter-search button {
    width: 100%;
  }

  .material-grid,
  .category-grid,
  .order-box {
    grid-template-columns: 1fr;
  }

  .section {
    padding: 42px 0;
  }

  .service-band,
  .section-head {
    align-items: flex-start;
    flex-direction: column;
  }
}