:root {
  --blue: #2f5fb7;
  --deep-blue: #284d95;
  --text: #222;
  --muted: #666;
  --red: #d14848;
  --bg: #ececec;
  --card: #ffffff;
  --line: #dddddd;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
  font-size: 12px;
  line-height: 1.75;
}

#what,#how,#who,#guide,#coop,#case {
        scroll-margin-top: 44px;
}
a { color: inherit; text-decoration: none; }
/*a:hover { color: var(--deep-blue); }*/

.container {
  width: 1280px;
  max-width: calc(100% - 40px);
  margin: 0 auto;
}

.site-header {
  padding: 18px 0 10px;
}

.brand {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 22px;
  min-height: 70px;
}

.logo {
  font-size: 30px;
  font-weight: 800;
  letter-spacing: 0.5px;
  color: #2b6ee1;
}
.logo span { color: #666; }

.slogan {
  font-size: 18px;
  color: #555;
  letter-spacing: 1px;
}

.site-nav {
  position: relative;
  z-index: 10;
  background: #fff;
  border-top: 1px solid #e4e4e4;
  border-bottom: 1px solid #d9d9d9;
  box-shadow: 0 1px 2px rgba(0,0,0,.05);
}

.nav-list {
  list-style: none;
  margin: 0 auto;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(6, 1fr);
}

.nav-list li {
  display: flex;
  justify-content: center;
}

.nav-list a {
  position: relative;
  display: inline-block;
  padding: 12px 18px;
  text-align: center;
  font-weight: 700;
  font-size: 15px;
  line-height: 1.2;
  color: #222;
}

.nav-list a::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: 8px;
  transform: translateX(-50%);
  width: 80px;
  height: 10px;
  background: rgba(47,95,183,.18);
}

.page-wrap { padding: 10px 0 24px; }

.block-card,
.guide-section,
.case-section,
.list-section {
  background: var(--card);
  margin: 12px auto 24px;
  padding: 14px 18px;
  box-shadow: 0 1px 3px rgba(0,0,0,.08);
}

.block-card {
  display: flex;
  align-items: center;
  gap: 22px;
}

.side-title {
  width: 190px;
  min-width: 190px;
  text-align: center;
  color: var(--deep-blue);
  font-size: 28px;
  line-height: 1.3;
  font-weight: 700;
}

.side-title.red { color: var(--red); }
.card-content p { margin: 0 0 8px; text-align: justify; }
.card-content strong { font-weight: 700; }

.center-title,
.coop-title,
.list-section h2 {
  text-align: center;
  margin: 8px 0 16px;
  color: var(--deep-blue);
  font-size: 26px;
}

.guide-grid {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px 18px;
  padding: 0;
  margin: 0;
}
.guide-grid li { text-align: center; }
.guide-grid a { font-weight: 700; }
.guide-grid li:nth-child(1) a,
.guide-grid li:nth-child(4) a,
.guide-grid li:nth-child(7) a { color: #d34b4b; }
.guide-grid li:nth-child(3) a,
.guide-grid li:nth-child(6) a,
.guide-grid li:nth-child(9) a { color: #2c6dd6; }
.guide-grid li:nth-child(2) a,
.guide-grid li:nth-child(8) a { color: #f07a24; }
.guide-grid li:nth-child(5) a { color: #2b9b46; }

.coop-section {
  margin: 0 auto 24px;
}
.coop-sub {
  text-align: center;
  color: var(--muted);
  margin-bottom: 18px;
}
.coop-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
}
.coop-card {
  background: #fff;
  display: flex;
  min-height: 220px;
  box-shadow: 0 1px 3px rgba(0,0,0,.08);
}
.coop-left {
  width: 180px;
  min-width: 180px;
  padding: 28px 18px;
  text-align: center;
  color: #8c1f1f;
}
.coop-left h3 {
  margin: 0 0 8px;
  font-size: 24px;
}
.price { font-size: 20px; font-weight: 700; }
.tag { font-size: 12px; color: var(--deep-blue); margin-top: 12px; }
.coop-right {
  padding: 24px 20px 20px 0;
  text-align: justify;
}
.coop-right p { margin: 0 0 8px; }
.split-card {
  display: flex;
  flex-direction: column;
  justify-content: center;
}
.split-item {
  display: flex;
  min-height: 108px;
}
.split-item + .split-item { border-top: 1px solid var(--line); }
.coop-left.small { padding-top: 18px; }
.contact-bar {
  display: block;
  width: fit-content;
  margin: 18px auto 0;
  background: var(--deep-blue);
  color: #fff;
  padding: 12px 34px;
  text-align: center;
  font-weight: 700;
  box-shadow: 0 1px 3px rgba(0,0,0,.12);
}

.case-head {
  display: flex;
  align-items: baseline;
  gap: 18px;
  margin-bottom: 10px;
}
.case-head h2 {
  margin: 0;
  color: #d13c3c;
  font-size: 26px;
}
.case-head p { margin: 0; color: #666; }
.case-scroll {
  display: flex;
  align-items: center;
  gap: 18px;
  overflow-x: auto;
  padding: 8px 2px 8px 26px;
  border-bottom: 1px solid #cfcfcf;
}
.case-tip {
  min-width: 64px;
  writing-mode: vertical-rl;
  text-orientation: mixed;
  color: #555;
}
.img-placeholder {
  border: 1px dashed #bdbdbd;
  background: linear-gradient(180deg, #fafafa, #f0f0f0);
  color: #888;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
}
.img-placeholder.wide {
  min-width: 560px;
  height: 260px;
  border-radius: 3px;
}

.list-section h2 { color: #222; }
.list-desc {
  text-align: center;
  color: #666;
  margin: 0 0 18px;
}
.list-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
.list-grid h3 {
  margin: 0 0 8px;
  font-size: 22px;
}
.list-grid ul {
  list-style: none;
  margin: 0;
  padding: 0;
}
.list-grid li {
  margin-bottom: 5px;
}
.all-link {
  display: block;
  width: fit-content;
  margin: 18px auto 4px;
  font-size: 20px;
}

.site-footer {
  background: #dedede;
  text-align: center;
  padding: 24px 10px 30px;
  color: #555;
}

@media (max-width: 767px) {
  body { font-size: 11px; }
  .container { max-width: calc(100% - 12px); }
  .site-header { padding: 8px 0 4px; }
  .brand {
    display: block;
    min-height: auto;
    text-align: left;
  }
  .logo { font-size: 22px; }
  .slogan {
    font-size: 16px;
    margin-top: 2px;
    letter-spacing: 0;
  }
  .site-nav {
    position: relative;
    top: auto;
  }
  .nav-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .nav-list li {
    min-width: 0;
/*    border-right: 1px solid #e9e9e9;
    border-bottom: 1px solid #e9e9e9;*/
  }
  .nav-list li:nth-child(2n) {
    border-right: 0;
  }
  .nav-list a {
    display: inline-flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    width: 100%;
    min-height: 44px;
    padding: 8px 6px 7px;
    font-size: 16px;
    line-height: 1.25;
  }
  .nav-list a::after {
    position: static;
    transform: none;
    display: block;
    width: 44px;
    height: 5px;
    margin: 5px auto 0;
    background: rgba(47,95,183,.18);
  }
  .page-wrap { padding-top: 6px; }
  .block-card,
  .guide-section,
  .case-section,
  .list-section {
    margin: 6px auto 10px;
    padding: 8px 8px 10px;
  }
  .block-card {
    display: block;
  }
  .side-title {
    width: 100%;
    min-width: 0;
    font-size: 15px;
    margin-bottom: 6px;
  }
  .card-content p { margin-bottom: 6px; }
  .center-title,
  .coop-title,
  .list-section h2 {
    font-size: 15px;
    margin: 4px 0 8px;
  }
  .guide-grid {
    grid-template-columns: 1fr 1fr;
    gap: 4px 8px;
  }
  .coop-sub { margin-bottom: 8px; }
  .coop-grid {
    grid-template-columns: 1fr;
    gap: 8px;
  }
  .coop-card,
  .split-item {
    display: block;
    min-height: 0;
  }
  .coop-left,
  .coop-left.small {
    width: 100%;
    min-width: 0;
    padding: 8px 8px 2px;
  }
  .coop-left h3 { font-size: 14px; margin-bottom: 2px; }
  .price { font-size: 13px; }
  .tag { margin-top: 2px; }
  .coop-right { padding: 2px 8px 8px; }
  .contact-bar {
    width: 100%;
    padding: 8px 12px;
    font-size: 10px;
    line-height: 1.5;
  }
  .case-head {
    display: block;
  }
  .case-head h2 { font-size: 14px; margin-bottom: 4px; }
  .case-scroll {
    gap: 8px;
    padding: 6px 0 6px 8px;
  }
  .case-tip {
    min-width: 20px;
    font-size: 10px;
  }
  .img-placeholder.wide {
    min-width: 220px;
    height: 120px;
  }
  .list-grid {
    grid-template-columns: 1fr 1fr;
    gap: 10px;
  }
  .list-grid h3 { font-size: 13px; margin-bottom: 4px; }
  .all-link { font-size: 12px; margin-top: 10px; }
  .site-footer {
    padding: 14px 8px 18px;
    font-size: 10px;
  }
}

@media (min-width: 768px) {
  .site-nav {
    position: sticky;
    top: 0;
  }
}

.nav-list a.hot::after { background: rgba(209,60,60,.18); }


.underline {
    text-decoration-line: underline;
}