:root {
  --ink: #151719;
  --muted: #5b646e;
  --line: #d8dde3;
  --paper: #f7f8fa;
  --white: #ffffff;
  --blue: #064f8f;
  --blue-deep: #07335d;
  --steel: #617787;
  --red: #c63a2f;
  --green: #4d7b6d;
  --shadow: 0 18px 40px rgba(15, 24, 32, 0.12);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: "Microsoft YaHei", "PingFang SC", "Noto Sans CJK SC", Arial, sans-serif;
  line-height: 1.7;
}

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

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 14px clamp(18px, 4vw, 56px);
  border-bottom: 1px solid rgba(216, 221, 227, 0.86);
  background: rgba(247, 248, 250, 0.94);
  backdrop-filter: blur(14px);
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 240px;
}

.brand-mark {
  display: grid;
  width: 40px;
  height: 40px;
  place-items: center;
  border: 2px solid var(--blue);
  color: var(--blue);
  font-size: 13px;
  font-weight: 800;
}

.brand strong,
.brand small {
  display: block;
}

.brand strong {
  font-size: 17px;
  line-height: 1.2;
}

.brand small {
  color: var(--muted);
  font-size: 12px;
  line-height: 1.35;
}

.top-nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 6px;
}

.top-nav a {
  padding: 7px 10px;
  border-bottom: 2px solid transparent;
  color: #2f3841;
  font-size: 14px;
}

.top-nav a:hover {
  border-color: var(--red);
  color: var(--blue-deep);
}

.hero-section,
.content-band,
.source-strip {
  padding-inline: clamp(18px, 4vw, 56px);
}

.hero-section {
  display: grid;
  grid-template-columns: minmax(0, 0.92fr) minmax(340px, 1.08fr);
  align-items: stretch;
  gap: clamp(24px, 4vw, 54px);
  min-height: calc(100vh - 69px);
  padding-block: clamp(34px, 7vh, 72px);
  border-bottom: 1px solid var(--line);
  background:
    linear-gradient(90deg, rgba(255, 255, 255, 0.96), rgba(255, 255, 255, 0.76)),
    url("site-assets/raw-pdf-images/image-001.jpg") center / cover no-repeat;
}

.hero-copy {
  align-self: center;
  max-width: 760px;
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--red);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0;
  text-transform: uppercase;
}

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

h1 {
  max-width: 740px;
  margin-bottom: 18px;
  font-size: clamp(36px, 6vw, 72px);
  line-height: 1.06;
  letter-spacing: 0;
}

h2 {
  margin-bottom: 0;
  font-size: clamp(28px, 4vw, 46px);
  line-height: 1.18;
  letter-spacing: 0;
}

h3 {
  margin-bottom: 12px;
  font-size: 22px;
  line-height: 1.28;
  letter-spacing: 0;
}

.lead {
  max-width: 690px;
  color: #303942;
  font-size: clamp(17px, 2vw, 22px);
}

.quick-facts {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1px;
  margin: 34px 0 0;
  border: 1px solid var(--line);
  background: var(--line);
}

.quick-facts div {
  min-height: 112px;
  padding: 18px;
  background: rgba(255, 255, 255, 0.94);
}

.quick-facts dt {
  margin-bottom: 8px;
  color: var(--blue);
  font-size: 13px;
  font-weight: 800;
}

.quick-facts dd {
  margin: 0;
  color: #222a32;
  font-size: 15px;
}

.image-crop {
  position: relative;
  overflow: hidden;
  margin: 0;
  border: 1px solid rgba(17, 24, 31, 0.1);
  background: #0e1114;
  box-shadow: var(--shadow);
  cursor: zoom-in;
}

.image-crop img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: brightness(1.14) contrast(1.1) saturate(1.08);
}

.image-crop figcaption {
  position: absolute;
  left: 14px;
  right: 14px;
  bottom: 12px;
  max-width: calc(100% - 28px);
  padding: 6px 9px;
  color: #fff;
  background: rgba(6, 18, 30, 0.74);
  font-size: 12px;
  line-height: 1.45;
  word-break: break-word;
}

.hero-visual {
  align-self: stretch;
  min-height: 520px;
}

.crop-hero-machine img {
  object-position: 72% 46%;
  filter: brightness(1.03) contrast(1.04) saturate(1.02);
}

.content-band {
  padding-block: clamp(56px, 8vw, 104px);
  background: var(--white);
}

.muted-band {
  background: #eef2f5;
}

.section-head {
  display: grid;
  grid-template-columns: minmax(180px, 0.38fr) minmax(0, 1fr);
  align-items: end;
  gap: clamp(18px, 4vw, 48px);
  max-width: 1320px;
  margin: 0 auto 34px;
}

.article-grid,
.principle-layout,
.operation-grid,
.knowledge-grid,
.series-panels,
.spec-table-wrap {
  max-width: 1320px;
  margin-inline: auto;
}

.article-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(280px, 0.8fr);
  gap: 18px;
}

.article-block {
  padding: clamp(20px, 3vw, 32px);
  border: 1px solid var(--line);
  background: var(--white);
}

.muted-band .article-block {
  background: #fbfcfd;
}

.article-block p:last-child,
.clean-list,
.feature-list {
  margin-bottom: 0;
}

.clean-list,
.feature-list {
  padding-left: 1.15em;
}

.clean-list li,
.feature-list li {
  margin: 10px 0;
}

.principle-layout {
  display: grid;
  grid-template-columns: minmax(340px, 0.92fr) minmax(0, 1.08fr);
  gap: 24px;
}

.crop-products {
  min-height: 680px;
}

.crop-products img {
  object-position: 58% 38%;
}

.steps {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.steps article {
  min-height: 250px;
  padding: 24px;
  border: 1px solid rgba(97, 119, 135, 0.32);
  background: #fff;
}

.steps span {
  display: grid;
  width: 36px;
  height: 36px;
  margin-bottom: 18px;
  place-items: center;
  background: var(--blue);
  color: #fff;
  font-weight: 800;
}

.series-switcher {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  max-width: 1320px;
  margin: 0 auto 18px;
}

.tab-button {
  min-height: 42px;
  padding: 8px 16px;
  border: 1px solid var(--line);
  background: #fff;
  color: var(--ink);
  font: inherit;
  font-weight: 700;
  cursor: pointer;
}

.tab-button.is-active {
  border-color: var(--blue);
  background: var(--blue);
  color: #fff;
}

.series-panel {
  display: none;
  grid-template-columns: minmax(260px, 0.42fr) minmax(0, 0.58fr);
  gap: 20px;
  align-items: stretch;
}

.series-panel.is-active {
  display: grid;
}

.series-panel > div {
  padding: clamp(22px, 3vw, 38px);
  background: #102333;
  color: #fff;
}

.series-panel p {
  color: rgba(255, 255, 255, 0.78);
}

.series-panel .image-crop {
  min-height: 560px;
}

.crop-series-left img {
  object-position: 22% 43%;
}

.crop-series-right img {
  object-position: 73% 50%;
}

.crop-d53k img {
  object-position: 46% 42%;
}

.operation-grid {
  display: grid;
  grid-template-columns: minmax(360px, 0.58fr) minmax(280px, 0.42fr);
  gap: 20px;
}

.crop-console {
  min-height: 520px;
}

.crop-console img {
  object-position: 66% 54%;
}

.compact {
  align-self: stretch;
}

.feature-list strong {
  color: var(--blue-deep);
}

.spec-table-wrap {
  overflow-x: auto;
  border: 1px solid var(--line);
  background: #fff;
}

.spec-table {
  width: 100%;
  min-width: 760px;
  border-collapse: collapse;
}

.spec-table th,
.spec-table td {
  padding: 17px 18px;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

.spec-table th {
  background: #102333;
  color: #fff;
  font-weight: 800;
}

.spec-table tr:last-child td {
  border-bottom: 0;
}

.knowledge-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.source-strip {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 22px;
  padding-block: 36px;
  background: #111820;
  color: #fff;
}

.source-strip h2 {
  font-size: 28px;
}

.source-strip p {
  max-width: 820px;
  margin-bottom: 0;
  color: rgba(255, 255, 255, 0.74);
}

.source-strip .contact-line {
  margin-top: 14px;
  color: #fff;
  font-size: 20px;
  font-weight: 800;
}

.contact-line a {
  color: #fff;
}

.source-link {
  flex: 0 0 auto;
  min-height: 44px;
  padding: 9px 16px;
  border: 1px solid rgba(255, 255, 255, 0.42);
  background: rgba(255, 255, 255, 0.08);
  color: #fff;
  font-weight: 800;
}

.image-dialog {
  width: min(94vw, 1280px);
  padding: 0;
  border: 0;
  background: transparent;
}

.image-dialog::backdrop {
  background: rgba(5, 10, 14, 0.86);
}

.image-dialog img {
  width: 100%;
  max-height: 90vh;
  object-fit: contain;
  background: #000;
}

.dialog-close {
  position: absolute;
  top: -44px;
  right: 0;
  width: 38px;
  height: 38px;
  border: 1px solid rgba(255, 255, 255, 0.4);
  background: rgba(0, 0, 0, 0.6);
  color: #fff;
  font-size: 26px;
  line-height: 1;
  cursor: pointer;
}

@media (max-width: 1060px) {
  .hero-section,
  .principle-layout,
  .series-panel,
  .operation-grid,
  .knowledge-grid {
    grid-template-columns: 1fr;
  }

  .hero-section {
    min-height: auto;
  }

  .hero-visual,
  .crop-products,
  .series-panel .image-crop,
  .crop-console {
    min-height: 420px;
  }

  .knowledge-grid {
    gap: 14px;
  }

  .quick-facts {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 760px) {
  .site-header {
    position: static;
    align-items: flex-start;
    flex-direction: column;
  }

  .top-nav {
    justify-content: flex-start;
  }

  .section-head,
  .article-grid,
  .steps,
  .quick-facts {
    grid-template-columns: 1fr;
  }

  .hero-section {
    padding-top: 28px;
  }

  h1 {
    font-size: 38px;
  }

  .hero-visual,
  .crop-products,
  .series-panel .image-crop,
  .crop-console {
    min-height: 320px;
  }

  .source-strip {
    align-items: flex-start;
    flex-direction: column;
  }
}