:root {
  --color-primary: #1858AF;
  --color-primary-dark: #1a4f96;
  --color-primary-light: #e9effb;
  --color-text: #2c3e50;
  --color-text-muted: #6b7c93;
  --color-border: #d8e2f0;
  --color-white: #ffffff;
  --radius: 4px;
  --shadow: 0 4px 20px rgba(34, 98, 184, 0.08);
  --shadow-hover: 0 8px 32px rgba(34, 98, 184, 0.14);
}

*, *::before, *::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

html, body, div, span, h1, h2, h3, p, a, ul, li, button {
  margin: 0;
  padding: 0;
  border: 0;
  font-size: 100%;
  font-family: Arial, sans-serif;
}

body {
  color: var(--color-text);
  background: var(--color-white);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

li {
  list-style: none;
}

/* ---- Layout ---- */
.container {
  max-width: 100%;
  margin: 0 auto;
  padding-left: 15px;
  padding-right: 15px;
}

.section {
  padding: 72px 0;
}
.section3 {
  padding: 0;
}
.section-tint {
  background: var(--color-primary-light);
}

.section-header {
  text-align: center;
  margin-bottom: 48px;
}

.section-title {
  font-size: 32px;
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1.25;
}

.section-title--left {
  text-align: left;
  margin-bottom: 20px;
}

.section-sub {
  margin-top: 12px;
  font-size: 17px;
  color: var(--color-text-muted);
  margin-left: auto;
  margin-right: auto;
}
ul {
    padding-left: 0 !important;
}

/* ---- Buttons ---- */
.btn1 {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 28px;
  font-size: 18px;
  border-radius: var(--radius);
  border: 2px solid transparent;
  cursor: pointer;
  transition: background 0.2s, color 0.2s, border-color 0.2s, transform 0.15s;
  white-space: nowrap;
}

.btn1:hover {
  transform: translateY(-1px);
}

.btn-primary1 {
  background: var(--color-primary);
  color: var(--color-white);
  border-color: var(--color-primary);
}

.btn-primary1:hover {
  background: var(--color-primary-dark);
  border-color: var(--color-primary-dark);
}

.btn-outline {
  background: transparent;
  color: var(--color-white);
  border-color: rgba(255, 255, 255, 0.6);
}

.btn-outline:hover {
  background: rgba(255, 255, 255, 0.12);
  border-color: var(--color-white);
}

.btn-sm {
  padding: 11px 22px;
  font-size: 14px;
  margin-top: 8px;
  font-weight: bold;
}

.btn-white {
  background: var(--color-white);
  color: var(--color-primary);
  border-color: var(--color-white);
}

.btn-white:hover {
  background: var(--color-primary-light);
}

.btn-outline-white {
  background: transparent;
  color: var(--color-white);
  border-color: rgba(255, 255, 255, 0.7);
}

.btn-outline-white:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: var(--color-white);
}

/* ---- Hero ---- */
.hero {
  background: url('/spare-parts/images/banner.jpg');
  background-size: cover;
  position: relative;
  overflow: hidden;
  margin-top: 2.4rem;
}

.hero-inner {
  position: relative;
  z-index: 1;
  padding: 150px 15px 150px;
  text-align: center;
}

.hero-tag {
  font-size: 13px;
  font-weight: 600;
  color: rgba(255, 255, 255, 0.75);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 16px;
}

.hero h1 {
  font-size: 44px;
  font-weight: 700;
  color: var(--color-white);
  line-height: 1.15;
  margin-bottom: 20px;
}

.hero-desc {
  font-size: 19px;
  color: rgba(255, 255, 255, 0.88);
  line-height: 1.6;
  margin-bottom: 45px;
}

.hero-actions {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 50px;
}
.btn-hero {
  background: var(--color-white);
  color: var(--color-primary);
  border-color: var(--color-white);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.15);
}

.btn-hero:hover {
  background: var(--color-primary-light);
  border-color: var(--color-primary-light);
  color: var(--color-primary-dark);
}

/* ---- Intro ---- */
.intro-text {
  font-size: 17px;
  line-height: 1.85;
  color: var(--color-text);
  text-align: center;
}

.update-date {
  margin-top: 18px;
  font-size: 14px;
  color: var(--color-text-muted);
}

/* ---- Why choose ---- */
.four-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}

.four-card {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding-top: 20px;
  transition: box-shadow 0.25s, transform 0.25s;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.four-card:hover {
  box-shadow: var(--shadow-hover);
  transform: translateY(-4px);
}

.card-icon {
  width: 48px;
  height: 48px;
  color: var(--color-primary);
  margin-bottom: 18px;
}

.four-card h3 {
  font-size: 17px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 10px;
  padding: 0 20px;
}

.four-card p {
  font-size: 15px;
  line-height: 1.7;
  color: var(--color-text-muted);
  padding: 0 20px;
  margin-bottom: 0 !important;
  hyphens: auto;
}
.four-card img {
  display: block;
  width: 100%;
  height: auto;
  margin-top: 25px;
}
.why-actions {
  gap: 96px;
  margin-top: 40px;
}
.why-actions a {
  width: 254px;
  box-shadow: none;
}
.why-actions a:last-child {
  border: 1px solid #1858af;
  color: #1858af;
}
/* ---- Content blocks ---- */
.content-split {
  display: grid;
  grid-template-columns: 1fr;
  gap: 30px;
  align-items: center;
}

.content-split--reverse .content-text,
.content-split--reverse .content-visual {
  order: unset;
}
.content-split--reverse .content-text {
  padding: 30px 15px 0;
}
.content-text p {
  font-size: 16px;
  line-height: 1.85;
  color: var(--color-text);
  margin-bottom: 16px;
}

.feature-list { margin: 16px 0 20px; }

.feature-list li {
  font-size: 15px;
  line-height: 1.75;
  color: var(--color-text-muted);
  margin-bottom: 12px;
  padding-left: 18px;
  border-left: 3px solid var(--color-primary);
}
.feature-list li strong {
    color: var(--color-text-muted);
}

.check-list { margin: 16px 0 20px; }

.check-list li {
  font-size: 15px;
  line-height: 2;
  color: var(--color-text);
  padding-left: 26px;
  position: relative;
}

.check-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-primary);
}

.note {
  font-size: 15px;
  color: var(--color-text-muted);
  font-style: italic;
  margin-bottom: 8px;
}

.visual-box img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius);
}
.visual-box span {
  font-size: 18px;
  font-weight: 700;
  color: var(--color-primary);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.visual-box--dark {
  background: linear-gradient(145deg, var(--color-primary), var(--color-primary-dark));
}

.visual-box--dark span {
  color: var(--color-white);
}

/* ---- Parts carousel ---- */
.parts-carousel {
  position: relative;
}

.parts-carousel-inner {
  display: flex;
  align-items: center;
  gap: 16px;
}

.parts-carousel-viewport {
  flex: 1;
  overflow: hidden;
  padding: 0 2px 2px;
  box-sizing: border-box;
}

.parts-carousel-track {
  display: flex;
  gap: 24px;
  transition: transform 0.45s ease;
  will-change: transform;
}

.part-card {
  flex-shrink: 0;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: box-shadow 0.25s, transform 0.25s;
  box-sizing: border-box;
  backface-visibility: hidden;
}

.part-card:hover {
  box-shadow: var(--shadow-hover);
  transform: translateY(-3px);
}

.part-card:hover {
  box-shadow: var(--shadow-hover);
  transform: translateY(-3px);
}

.part-card-img img {
  display: block;
  width: 100%;
  height: auto;  
}

.part-card-body {
  padding: 22px 20px 24px;
}

.part-card-body h3 {
  font-size: 16px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 8px;
  line-height: 1.4;
}

.part-card-body p {
  font-size: 14px;
  color: var(--color-text-muted);
  line-height: 1.65;
}

.parts-cta {
  margin-top: 48px;
  padding: 35px;
  background: url('/spare-parts/images/img15.jpg') no-repeat center right;
  background-size: cover;
  border-radius: var(--radius);
  display: flex;
  flex-direction: column;
  justify-content: right;
  align-items: self-end;
}

.parts-cta p {
  font-size: 18px;
  line-height: 2.4;
  hyphens: auto;
  font-weight: bold;
  color: var(--color-text);
  max-width: 350px;
  text-align: right;
  margin-bottom: 20px;
}

.carousel-btn {
  flex-shrink: 0;
  width: 44px;
  height: 44px;
  border: 1px solid var(--color-border);
  border-radius: 50%;
  background: var(--color-white);
  color: var(--color-primary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s, border-color 0.2s, color 0.2s, box-shadow 0.2s;
}

.carousel-btn:hover:not(:disabled) {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: var(--color-white);
  box-shadow: var(--shadow);
}
.carousel-btn:hover:not(:disabled) svg polyline {
    color: var(--color-white);
}
.carousel-btn svg polyline {
    color: var(--color-primary);
}
.carousel-btn:disabled {
  opacity: 0.35;
  cursor: not-allowed;
}

.carousel-dots {
  display: flex;
  justify-content: center;
  gap: 10px;
  margin-top: 28px;
}

.carousel-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  border: none;
  padding: 0;
  background: #c5d4ea;
  cursor: pointer;
  transition: background 0.2s, transform 0.2s;
}

.carousel-dot:hover {
  background: #9bb5dc;
}

.carousel-dot.is-active {
  background: var(--color-primary);
  transform: scale(1.15);
}

/* ---- Heritage / stats ---- */
.heritage {
  background: url('/spare-parts/images/img17.jpg') no-repeat center bottom;
  background-size: cover;
}
.heritage-inner {
  display: grid;
  grid-template-columns: 1.5fr 1fr;
  gap: 56px;
  align-items: center;
}
.heritage-text {
  display: flex;
  flex-direction: column;
  align-items: start;
  justify-content: flex-start;
}
.heritage-text h2 {
  font-size: 28px;
  font-weight: 700;
  color: var(--color-white);
  margin-bottom: 16px;
  text-shadow: 0px 1px 3px rgba(0, 0, 0, 0.2)
}

.heritage-text p {
  font-size: 16px;
  color: var(--color-white);
  line-height: 40px;
  text-shadow: 0px 1px 3px rgba(0, 0, 0, 0.2)
}
.heritage-text .icon {
  margin: 25px 0 45px;
  max-width: 90%;
}
.heritage-text a {
  width: 224px;
  font-weight: 600;
  color: #1858af;
}
.heritage-text a span {
  font-family: SimHei;
  font-weight: 500;
}
.heritage-stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 70px;
}

.stat {
  text-align: center;
  padding: 45px 16px;
  background: rgba(255, 255, 255, .1);
  border-radius: var(--radius);
  border: solid 1px #d8e2f05f;
}

.stat-num {
  display: block;
  font-size: 36px;
  font-weight: 700;
  color: var(--color-white);
  line-height: 1;
  margin-bottom: 10px;
  text-shadow: 1px 1px 3px rgba(0, 0, 0, 0.5)
}

.stat-label {
  font-size: 13px;
  color: var(--color-white);
  text-transform: uppercase;
  text-shadow: 1px 1px 3px rgba(0, 0, 0, 0.5)
}

/* ---- Strength & trust (accordion) ---- */
.strength-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 25px;
  align-items: start;
  justify-items: center
}

.strength-visual {
  position: static;
  max-width: 480px;
}
.strength-carousel {
  position: relative;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  background: var(--color-primary-light);
}

.strength-carousel-track {
  display: flex;
  transition: transform 0.5s ease;
  will-change: transform;
}

.strength-slide {
  flex: 0 0 100%;
  width: 100%;
}

.strength-slide img {
  display: block;
  width: 100%;
  height: auto;
}

.strength-carousel-dots {
  position: absolute;
  left: 50%;
  bottom: 6.5%;
  transform: translateX(-50%);
  display: flex;
  gap: 20px;
  border-radius: 999px;
  backdrop-filter: blur(3px);
  -webkit-backdrop-filter: blur(3px);
}

.strength-carousel-dot {
  width: 88px;
  height: 4px;
  padding: 0;
  border: 0;
  background: rgba(255, 255, 255, 1);
  cursor: pointer;
  opacity: 0.58;
  transition: background 0.25s, transform 0.25s;
}

.strength-carousel-dot:hover {
  background: #e6891b;
}

.strength-carousel-dot.is-active {
  background: #e6891b;
}


.strength-accordion {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.acc-item {
  background: var(--color-white);
  border: solid 1px #e9effb;
  border-radius: var(--radius);
  overflow: hidden;
}

.acc-item.is-open {
  border-bottom: 4px solid var(--color-primary);
}
.acc-item.is-open .acc-title {
  font-weight: bold;
}
.acc-head {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 15px 20px;
  background: none;
  border: 0;
  cursor: pointer;
  text-align: left;
  font-family: inherit;
}

.acc-title {
  font-size: 16px;
  color: var(--color-primary);
  line-height: 1.45;
}

.acc-icon {
  flex-shrink: 0;
  position: relative;
  width: 24px;
  height: 24px;
  border: solid 1px #bfd1f3;
  border-radius: 50%;
}

.acc-icon::before,
.acc-icon::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  background: var(--color-primary);
  border-radius: 2px;
  transition: transform 0.25s ease, opacity 0.25s ease;
}

.acc-icon::before {
  width: 12px;
  height: 2px;
  transform: translate(-50%, -50%);
}

.acc-icon::after {
  width: 2px;
  height: 12px;
  transform: translate(-50%, -50%);
}

.acc-item.is-open .acc-icon::after {
  transform: translate(-50%, -50%) rotate(90deg);
  opacity: 0;
}

.acc-panel {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease;
}

.acc-panel-inner {
  padding: 0 20px 15px;
}

.acc-panel-inner p {
  font-size: 15px;
  line-height: 26px;
  color: #6b7c93;
  margin-bottom: 0;
}

/* ---- CTA banner ---- */
.cta-banner {
  background: url('/spare-parts/images/img19.jpg') no-repeat center;
  background-size: cover;
  padding: 56px 0;
}

.cta-banner-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
  flex-wrap: wrap;
}

.cta-banner-text h2 {
  font-size: 26px;
  font-weight: 700;
  color: var(--color-white);
  margin-bottom: 8px;
}

.cta-banner-text p {
  font-size: 16px;
  color: rgba(255, 255, 255, 0.85);
  max-width: 520px;
}

.cta-banner-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 30px;
}
.cta-banner-actions a {
  width: 219px;
  padding: 9px 18px;
}

/* ---- Responsive ---- */

@media (max-width: 960px) {
  .four-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .parts-carousel-inner {
    gap: 10px;
  }

  .carousel-btn {
    width: 38px;
    height: 38px;
  }

  .heritage-inner {
    grid-template-columns: 1fr;
  }
  .strength-grid {
    grid-template-columns: 1fr;
  }
  .hero h1 {
    font-size: 34px;
  }

  .section-title {
    font-size: 26px;
  }
}
@media (max-width: 640px) {
  .section {
    padding: 52px 0;
  }
  .btn {
    font-size: 16px;
    padding: 10px 18px;
  }
  .four-grid,
  .services-grid {
    grid-template-columns: 1fr;
  }

  .parts-carousel-inner {
    position: relative;
  }
  .heritage-stats {
    gap: 30px;
  }
  .carousel-btn {
    position: absolute;
    top: calc(50% - 19px);
    z-index: 2;
    box-shadow: var(--shadow);
  }

  .carousel-btn--prev {
    left: 8px;
  }

  .carousel-btn--next {
    right: 8px;
  }

  .parts-carousel-viewport {
    padding: 0 4px;
  }

  .hero-inner {
    padding: 60px 24px 56px;
  }

  .hero h1 {
    font-size: 28px;
  }

  .hero-desc {
    font-size: 16px;
  }

  .hero-actions {
    flex-direction: column;
    align-items: stretch;
    align-content: center;
    gap: 30px;
  }

  .hero-actions .btn {
    width: 200px;
  }

  .cta-banner-inner {
    flex-direction: column;
    align-items: flex-start;
  }

  .cta-banner-actions {
    width: 100%;
    flex-direction: column;
  }

  .cta-banner-actions .btn {
    width: 100%;
  }
  .content-split--reverse .content-text {
    padding: 0px 15px 0;
  }
  .why-actions {
    margin-top: 30px;
  }
}
@media (min-width: 576px) {
  .four-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}
@media (min-width: 768px) {
  .four-card p {
      height: 93px;
    }
  .four-card h3 {
      height: 27.19px;
    }
}
@media (min-width: 992px) {
  .four-card p {
      height: 75px;
    }
  .four-card h3 {
      height: 27.19px;
    }
  .heritage-stats {
    gap: 40px;
  }
}
@media (min-width: 1200px) {
    .container{
        max-width: 1120px !important;
    }
    .four-grid {
      grid-template-columns: repeat(4, 1fr);
  }
  
  .four-card p {
      height: 120px;
    }
  .four-card h3 {
      height: 54.38px;
    }
    .content-split {
      grid-template-columns: 1fr;
    }
    
    .content-split--reverse {
      max-width: 1120px;
      margin: 0 auto;
      padding: 0 15px;
    }
    .content-split--reverse .content-text {
      padding: 35px 0 0;
    }
    .strength-grid {
      grid-template-columns: 410px 1fr;
    }
    .strength-visual {
      position: sticky;
      top: 24px;
      max-width: none;
    }
}
@media (min-width: 1400px) {
    .container{
        max-width: 1320px !important;
    }
    .four-grid {
      grid-template-columns: repeat(4, 1fr);
  }
  .four-card {
    padding-top: 32px;
  }
    .four-card h3 {
      height: 27.19px;
    }
  .four-card p {
      height: 103px;
    }
    .parts-cta {
      padding: 63px 35px;
    }
    .heritage-inner {
      grid-template-columns: 1.85fr 1fr;
      gap: 70px;
    }
    .content-split {
      grid-template-columns: repeat(2, 1fr);
      gap: 45px;
    }
    .content-split--reverse {
      max-width: 100%;
      padding: 0;
    }
    .content-split--reverse .content-text { order: 2; padding: 35px 0px 35px 0;max-width: 623px;}
    .content-split--reverse .content-visual { order: 1; }
    .strength-grid {
      grid-template-columns: 510px 1fr;
      gap: 40px;
    }
    .acc-title {
      font-size: 18px;
    }
    .acc-head {
      padding: 18px 30px;
    }
    .acc-panel-inner {
      padding: 0 30px 20px;
    }
    .acc-item.is-open .acc-panel-inner {
      min-height: 150px;
    }
}
@media (min-width: 1800px) {
    .container{
        max-width: 1440px !important;
    }
    .hero h1 {
        font-size: 48px;
      }
    
    .content-split {
      gap: 56px;
    }
    .content-split--reverse .content-text {
      padding: 30px 0px 30px 0;
      max-width: 677px;
    }
    .strength-grid {
      grid-template-columns: 509px 1fr;
    }
    .acc-item.is-open .acc-head {
      padding: 30px 30px 20px;
    }
    .acc-item.is-open .acc-panel-inner {
      min-height: 134px;
      padding: 0 30px 30px;
    }
}