* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  color: #333;
  background: #ffffff;
}

.site-header {
  display: flex;
  align-items: center;
  gap: 32px;
  padding: 18px 5%;
  background: #f3f3f3;
  border-bottom: 1px solid #e2e2e2;
}

.logo-area {
  display: flex;
  align-items: center;
  min-width: 260px;
}

.logo-circle {
  width: 54px;
  height: 54px;
  background: #d9001b;
  color: #fff;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 28px;
  font-weight: bold;
  margin-right: 12px;
}

.logo-text {
  font-size: 30px;
  font-weight: bold;
}

.nav-menu {
  display: flex;
  gap: 28px;
  align-items: center;
  flex: 1;
}

.nav-menu a {
  color: #0070b8;
  font-size: 24px;
  text-decoration: none;
}

.nav-menu a:hover {
  text-decoration: underline;
}

.top-search {
  display: flex;
  width: 35%;
  min-width: 300px;
}

.top-search input {
  flex: 1;
  padding: 14px 18px;
  font-size: 22px;
  border: 1px solid #ccc;
  font-style: italic;
  color: #666;
}

.top-search button {
  padding: 14px 22px;
  border: none;
  background: #cf1037;
  color: #fff;
  font-size: 22px;
  cursor: pointer;
}

.hero {
  text-align: center;
  padding: 34px 5% 36px;
}

.hero h1 {
  margin: 0 0 18px;
  font-size: 44px;
  font-weight: 400;
}

.hero p {
  margin: 0 0 44px;
  font-size: 28px;
}

.main-search {
  display: flex;
  gap: 24px;
  max-width: 1500px;
  margin: 0 auto;
}

.main-search input {
  flex: 1;
  padding: 22px;
  font-size: 28px;
  border: 1px solid #ccc;
}

.main-search button {
  padding: 20px 42px;
  background: #3778d4;
  color: #fff;
  border: none;
  border-radius: 6px;
  font-size: 30px;
  cursor: pointer;
}

.catalogues {
  width: 94%;
  margin: 22px auto 36px;
  border: 1px solid #ddd;
  border-radius: 6px;
}

.catalogues h2 {
  margin: 0;
  padding: 24px;
  font-size: 30px;
  font-weight: 400;
  background: #f6f6f6;
  border-bottom: 1px solid #eee;
}

.brand-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 28px;
  padding: 52px 32px;
}

.brand-btn {
  background: transparent;
  border: none;
  cursor: pointer;
  color: #0070b8;
  font-size: 24px;
}

.brand-icon {
  width: 90px;
  height: 90px;
  margin: 0 auto 18px;
  border: 6px solid #bfbfbf;
  border-radius: 50%;
  color: #bfbfbf;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 42px;
  font-weight: bold;
}

.breadcrumb {
  width: 94%;
  margin: 0 auto 24px;
  display: flex;
  gap: 14px;
  align-items: center;
  padding: 18px 0;
  color: #1a73b8;
  border-bottom: 1px solid #d6d6d6;
  font-size: 20px;
}

.breadcrumb strong {
  color: #111;
}

.results-area {
  width: 94%;
  margin: 0 auto 60px;
}

.empty-message,
.loading,
.error-message,
.no-result {
  padding: 36px;
  border: 1px solid #ddd;
  background: #fafafa;
  font-size: 22px;
  text-align: center;
}

.error-message {
  color: #c00;
}

.part-card {
  padding: 28px 0;
  border-bottom: 1px solid #ddd;
}

.part-main {
  display: grid;
  grid-template-columns: 1fr 470px;
  gap: 44px;
  align-items: start;
}

.part-card h2 {
  margin: 0 0 14px;
  font-size: 42px;
  font-weight: 400;
  letter-spacing: 1px;
}

.genuine-title {
  margin: 0 0 20px;
  font-size: 32px;
}

.part-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin: 18px 0;
}

.part-meta span {
  background: #f2f2f2;
  padding: 8px 14px;
  border-radius: 4px;
  font-size: 16px;
}

.part-description {
  font-size: 18px;
  line-height: 1.7;
}

.vehicle-box,
.replacement-box {
  margin-top: 24px;
  padding: 20px;
  background: #f8f8f8;
  border-left: 4px solid #3778d4;
}

.vehicle-box h3,
.replacement-box h3 {
  margin-top: 0;
}

.vehicle-box ul {
  margin: 0;
  padding-left: 20px;
  line-height: 1.8;
}

.part-summary {
  text-align: center;
}

.part-number-box {
  position: relative;
  border: 1px dashed #ddd;
  background: #fff;
}

.bookmark {
  position: absolute;
  top: 0;
  right: 24px;
  color: #aaa;
  font-size: 44px;
}

.big-number {
  padding: 26px;
  font-size: 40px;
  color: #000;
}

.small-info {
  display: flex;
  justify-content: center;
  gap: 16px;
  padding: 12px;
  background: #fff9df;
  color: #777;
  font-size: 18px;
}

.diagram-link {
  display: block;
  margin: 18px 0;
  color: #0070b8;
  font-size: 22px;
  text-decoration: none;
}

.diagram-link:hover {
  text-decoration: underline;
}

.inquiry-btn {
  display: inline-block;
  margin-top: 14px;
  padding: 14px 28px;
  background: #3778d4;
  color: #fff;
  text-decoration: none;
  border-radius: 30px;
  font-size: 20px;
}

.inquiry-btn:hover {
  background: #235fae;
}

@media (max-width: 1100px) {
  .site-header {
    flex-wrap: wrap;
  }

  .top-search {
    width: 100%;
  }

  .brand-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .part-main {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 700px) {
  .logo-text {
    font-size: 22px;
  }

  .nav-menu {
    width: 100%;
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
  }

  .nav-menu a {
    font-size: 20px;
  }

  .hero h1 {
    font-size: 34px;
  }

  .hero p {
    font-size: 22px;
  }

  .main-search {
    flex-direction: column;
    gap: 12px;
  }

  .main-search input,
  .main-search button {
    width: 100%;
    font-size: 22px;
  }

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

  .part-card h2 {
    font-size: 32px;
  }

  .genuine-title {
    font-size: 24px;
  }

  .big-number {
    font-size: 30px;
  }
}