/* =========================================================
   物流数字化项目矩阵 · 宣传站 公共样式
   ========================================================= */
* { margin: 0; padding: 0; box-sizing: border-box; }

:root {
  --bg: #070b18;
  --bg-2: #0b1226;
  --panel: rgba(255, 255, 255, 0.04);
  --panel-2: rgba(255, 255, 255, 0.06);
  --line: rgba(255, 255, 255, 0.10);
  --line-2: rgba(255, 255, 255, 0.16);
  --txt: #e8edf7;
  --txt-2: #a9b6d0;
  --txt-3: #7684a3;
  --brand: #2f6bff;
  --brand-2: #00c2ff;
  --accent: #2f6bff;
  --accent-soft: rgba(47, 107, 255, 0.14);
  --radius: 16px;
  --shadow: 0 18px 50px -20px rgba(0, 0, 0, 0.7);
  --maxw: 1200px;
  --font: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  color: var(--txt);
  background: var(--bg);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -2;
  background:
    radial-gradient(900px 500px at 12% -8%, rgba(47, 107, 255, 0.22), transparent 60%),
    radial-gradient(800px 520px at 92% 4%, rgba(0, 194, 255, 0.14), transparent 58%),
    radial-gradient(900px 700px at 50% 108%, rgba(122, 92, 255, 0.12), transparent 60%);
}

body::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.028) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.028) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(ellipse 90% 60% at 50% 0%, #000 30%, transparent 78%);
  -webkit-mask-image: radial-gradient(ellipse 90% 60% at 50% 0%, #000 30%, transparent 78%);
}

a { color: inherit; text-decoration: none; }
ul { list-style: none; }
img { display: block; max-width: 100%; }

.wrap { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }

/* ---------------- Header ---------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  background: rgba(7, 11, 24, 0.72);
  border-bottom: 1px solid var(--line);
}
.site-header .inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}
.logo { display: flex; align-items: center; gap: 12px; font-weight: 800; letter-spacing: .3px; }
.logo .mark {
  width: 34px; height: 34px; border-radius: 10px;
  display: grid; place-items: center; font-size: 18px;
  background: linear-gradient(135deg, var(--brand), var(--brand-2));
  box-shadow: 0 8px 22px -8px rgba(47, 107, 255, 0.9);
}
.logo b { font-size: 17px; }
.logo span { display: block; font-size: 11px; font-weight: 500; color: var(--txt-3); letter-spacing: 1.5px; }

.nav { display: flex; align-items: center; gap: 30px; }
.nav a { color: var(--txt-2); font-size: 14.5px; transition: color .2s; }
.nav a:hover { color: #fff; }
.nav .btn-sm {
  padding: 9px 18px; border-radius: 999px; font-size: 14px; color: #fff;
  background: linear-gradient(135deg, var(--brand), var(--brand-2));
  box-shadow: 0 10px 26px -10px rgba(47, 107, 255, 0.95);
}
.nav .btn-sm:hover { filter: brightness(1.08); }

.burger { display: none; width: 40px; height: 40px; border: 1px solid var(--line); border-radius: 10px; background: transparent; color: #fff; font-size: 18px; cursor: pointer; }

/* ---------------- Buttons ---------------- */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 13px 26px; border-radius: 999px; font-weight: 600; font-size: 15px;
  border: 1px solid transparent; cursor: pointer; transition: .22s; white-space: nowrap;
}
.btn-primary {
  color: #fff; background: linear-gradient(135deg, var(--brand), var(--brand-2));
  box-shadow: 0 14px 34px -12px rgba(47, 107, 255, 0.95);
}
.btn-primary:hover { transform: translateY(-2px); filter: brightness(1.07); }
.btn-ghost { color: var(--txt); border-color: var(--line-2); background: var(--panel); }
.btn-ghost:hover { border-color: var(--brand); color: #fff; background: var(--accent-soft); }

/* ---------------- Hero ---------------- */
.hero { position: relative; padding: 92px 0 76px; text-align: center; }
.eyebrow {
  display: inline-flex; align-items: center; gap: 9px;
  padding: 7px 16px; border-radius: 999px; font-size: 13px; color: var(--txt-2);
  background: var(--panel); border: 1px solid var(--line); margin-bottom: 26px;
}
.eyebrow i { width: 7px; height: 7px; border-radius: 50%; background: #24d07a; box-shadow: 0 0 0 4px rgba(36, 208, 122, .18); }
.hero h1 {
  font-size: clamp(30px, 5.2vw, 58px); line-height: 1.14; font-weight: 900; letter-spacing: -.5px;
  max-width: 940px; margin: 0 auto 22px;
}
.hero h1 .grad {
  background: linear-gradient(120deg, #6fa0ff, #00d4ff 45%, #9d7bff);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero p.lead { font-size: clamp(15px, 1.8vw, 18px); color: var(--txt-2); max-width: 760px; margin: 0 auto 34px; }
.hero .cta { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }

.stats {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px;
  margin-top: 62px; padding: 26px; border-radius: var(--radius);
  background: var(--panel); border: 1px solid var(--line);
}
.stats .s { text-align: center; padding: 6px; }
.stats .s b { display: block; font-size: clamp(24px, 3vw, 34px); font-weight: 900; letter-spacing: -.5px;
  background: linear-gradient(120deg, #8fb4ff, #00d4ff); -webkit-background-clip: text; background-clip: text; color: transparent; }
.stats .s span { font-size: 13px; color: var(--txt-3); }

/* ---------------- Section ---------------- */
.section { padding: 74px 0; }
.section-head { text-align: center; max-width: 720px; margin: 0 auto 44px; }
.section-head .tag {
  display: inline-block; font-size: 12.5px; letter-spacing: 2px; font-weight: 700;
  color: var(--brand-2); text-transform: uppercase; margin-bottom: 12px;
}
.section-head h2 { font-size: clamp(24px, 3.2vw, 36px); font-weight: 900; letter-spacing: -.4px; margin-bottom: 12px; }
.section-head p { color: var(--txt-2); font-size: 15.5px; }

/* filter */
.filters { display: flex; gap: 10px; justify-content: center; flex-wrap: wrap; margin-bottom: 40px; }
.filters button {
  padding: 9px 20px; border-radius: 999px; font-size: 14px; cursor: pointer;
  color: var(--txt-2); background: var(--panel); border: 1px solid var(--line); transition: .2s;
}
.filters button:hover { color: #fff; border-color: var(--line-2); }
.filters button.active {
  color: #fff; border-color: transparent;
  background: linear-gradient(135deg, var(--brand), var(--brand-2));
  box-shadow: 0 10px 26px -12px rgba(47, 107, 255, .95);
}

/* ---------------- Project cards ---------------- */
.grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }

.card {
  position: relative; display: flex; flex-direction: column; overflow: hidden;
  border-radius: var(--radius); border: 1px solid var(--line);
  background: linear-gradient(180deg, var(--panel-2), var(--panel));
  transition: .28s; isolation: isolate;
}
.card:hover { transform: translateY(-6px); border-color: color-mix(in srgb, var(--accent) 55%, transparent); box-shadow: var(--shadow); }
.card .thumb { position: relative; aspect-ratio: 16 / 10; overflow: hidden; background: linear-gradient(135deg, var(--accent-soft), rgba(255,255,255,.03)); }
.card .thumb img { width: 100%; height: 100%; object-fit: cover; opacity: .92; transition: transform .5s; }
.card:hover .thumb img { transform: scale(1.06); }
.card .thumb .ph {
  position: absolute; inset: 0; display: grid; place-items: center; font-size: 54px;
  background: linear-gradient(135deg, var(--accent-soft), transparent 70%);
}
.card .thumb .cat {
  position: absolute; top: 12px; left: 12px; z-index: 2;
  padding: 5px 12px; border-radius: 999px; font-size: 12px; font-weight: 600;
  color: #fff; background: rgba(6, 10, 22, .72); border: 1px solid rgba(255,255,255,.16);
  backdrop-filter: blur(6px);
}
.card .body { padding: 22px 22px 24px; display: flex; flex-direction: column; flex: 1; }
.card .body h3 { font-size: 18px; font-weight: 800; margin-bottom: 8px; letter-spacing: -.2px; }
.card .body .desc { font-size: 14px; color: var(--txt-2); flex: 1; margin-bottom: 16px; }
.card .body .desc.clamp { display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden; }
.card .chips { display: flex; flex-wrap: wrap; gap: 7px; margin-bottom: 18px; }
.chip {
  font-size: 11.5px; padding: 4px 10px; border-radius: 7px;
  color: var(--txt-2); background: rgba(255,255,255,.05); border: 1px solid var(--line);
}
.card .more { display: inline-flex; align-items: center; gap: 6px; font-size: 14px; font-weight: 600; color: var(--brand-2); }
.card:hover .more { gap: 10px; }
.card .more::after { content: "\2192"; transition: .2s; }

/* ---------------- Feature / value ---------------- */
.feats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.feat { padding: 30px 26px; border-radius: var(--radius); border: 1px solid var(--line); background: var(--panel); }
.feat .ic {
  width: 48px; height: 48px; border-radius: 13px; display: grid; place-items: center; font-size: 22px;
  margin-bottom: 18px; background: var(--accent-soft); border: 1px solid var(--line);
}
.feat h3 { font-size: 16.5px; font-weight: 800; margin-bottom: 9px; }
.feat p { font-size: 14px; color: var(--txt-2); }

/* ---------------- Contact ---------------- */
.contact-box {
  display: grid; grid-template-columns: 1.15fr .85fr; gap: 40px; align-items: center;
  padding: 46px; border-radius: 22px; border: 1px solid var(--line-2);
  background: linear-gradient(135deg, rgba(47,107,255,.16), rgba(0,194,255,.06) 60%, rgba(122,92,255,.10));
}
.contact-box h2 { font-size: clamp(24px, 3vw, 34px); font-weight: 900; margin-bottom: 14px; letter-spacing: -.4px; }
.contact-box p { color: var(--txt-2); font-size: 15.5px; margin-bottom: 22px; }
.contact-card { background: rgba(6,10,22,.55); border: 1px solid var(--line); border-radius: var(--radius); padding: 28px; }
.contact-card .row { display: flex; align-items: center; gap: 14px; padding: 13px 0; border-bottom: 1px dashed var(--line); }
.contact-card .row:last-child { border-bottom: 0; }
.contact-card .row .ic { width: 40px; height: 40px; border-radius: 11px; display: grid; place-items: center; font-size: 19px; background: var(--accent-soft); }
.contact-card .row .k { font-size: 12.5px; color: var(--txt-3); }
.contact-card .row .v { font-size: 16px; font-weight: 700; letter-spacing: .5px; }
.qq-badge {
  display: inline-flex; align-items: center; gap: 10px; padding: 12px 20px; border-radius: 12px;
  font-weight: 800; font-size: 18px; color: #fff; letter-spacing: 1px;
  background: linear-gradient(135deg, #12b7f5, #2f6bff); box-shadow: 0 12px 30px -12px rgba(18,183,245,.9);
}

/* ---------------- Footer ---------------- */
.site-footer { border-top: 1px solid var(--line); padding: 44px 0 34px; margin-top: 20px; }
.site-footer .inner { display: flex; justify-content: space-between; gap: 26px; flex-wrap: wrap; }
.site-footer .brand b { font-size: 16px; }
.site-footer .brand p { color: var(--txt-3); font-size: 13.5px; margin-top: 8px; max-width: 420px; }
.site-footer .cols { display: flex; gap: 60px; flex-wrap: wrap; }
.site-footer .cols h4 { font-size: 13px; color: var(--txt-3); letter-spacing: 1px; margin-bottom: 12px; text-transform: uppercase; }
.site-footer .cols a { display: block; font-size: 14px; color: var(--txt-2); margin-bottom: 8px; }
.site-footer .cols a:hover { color: #fff; }
.copyright { margin-top: 34px; padding-top: 22px; border-top: 1px solid var(--line); font-size: 13px; color: var(--txt-3); display: flex; justify-content: space-between; gap: 14px; flex-wrap: wrap; }

/* =========================================================
   Project detail page
   ========================================================= */
.p-hero { padding: 52px 0 44px; border-bottom: 1px solid var(--line); position: relative; overflow: hidden; }
.p-hero::before {
  content: ""; position: absolute; inset: 0; z-index: -1;
  background: radial-gradient(700px 360px at 20% 0%, var(--accent-soft), transparent 62%);
}
.breadcrumb { font-size: 13.5px; color: var(--txt-3); margin-bottom: 22px; display: flex; align-items: center; gap: 8px; }
.breadcrumb a:hover { color: #fff; }
.p-hero .head { display: grid; grid-template-columns: 1fr auto; gap: 34px; align-items: center; }
.p-hero .icon-lg {
  width: 74px; height: 74px; border-radius: 20px; display: grid; place-items: center; font-size: 36px;
  background: linear-gradient(135deg, var(--accent-soft), rgba(255,255,255,.04)); border: 1px solid var(--line-2);
  margin-bottom: 20px;
}
.p-hero h1 { font-size: clamp(26px, 4vw, 42px); font-weight: 900; letter-spacing: -.6px; margin-bottom: 12px; }
.p-hero .sub { color: var(--brand-2); font-size: 14px; font-weight: 600; letter-spacing: .4px; margin-bottom: 14px; }
.p-hero .tagline { color: var(--txt-2); font-size: clamp(15px, 1.8vw, 18px); max-width: 720px; }
.p-hero .tags { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 22px; }
.p-hero .tags .chip { font-size: 12.5px; padding: 6px 13px; }
.p-hero .hero-cta { display: flex; flex-direction: column; gap: 12px; }
.p-hero .banner {
  width: 320px; aspect-ratio: 4/3; border-radius: 18px; overflow: hidden; border: 1px solid var(--line-2);
  background: linear-gradient(135deg, var(--accent-soft), rgba(255,255,255,.03)); position: relative;
}
.p-hero .banner img { width: 100%; height: 100%; object-fit: cover; }
.p-hero .banner .ph { position: absolute; inset: 0; display: grid; place-items: center; font-size: 64px; }

.p-stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; margin-top: 40px; }
.p-stats .s { padding: 20px; border-radius: 14px; background: var(--panel); border: 1px solid var(--line); text-align: center; }
.p-stats .s b { display: block; font-size: 24px; font-weight: 900; color: #fff; letter-spacing: -.4px; }
.p-stats .s span { font-size: 12.5px; color: var(--txt-3); }

.detail-wrap { padding: 60px 0; }
.detail-sec { margin-bottom: 60px; }
.detail-sec > h2 {
  font-size: 22px; font-weight: 900; margin-bottom: 8px; letter-spacing: -.3px;
  display: flex; align-items: center; gap: 12px;
}
.detail-sec > h2::before { content: ""; width: 4px; height: 22px; border-radius: 3px; background: linear-gradient(var(--brand), var(--brand-2)); }
.detail-sec > .hint { color: var(--txt-3); font-size: 14px; margin: 0 0 24px 16px; }

.overview-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.ov { padding: 24px; border-radius: 14px; background: var(--panel); border: 1px solid var(--line); }
.ov h4 { font-size: 14px; color: var(--brand-2); margin-bottom: 10px; letter-spacing: .4px; }
.ov p { font-size: 14.5px; color: var(--txt-2); }

.flowline { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; }
.flowline .step {
  padding: 12px 20px; border-radius: 12px; font-size: 14.5px; font-weight: 600;
  background: var(--panel); border: 1px solid var(--line-2);
}
.flowline .arrow { color: var(--brand-2); font-weight: 900; }

.tech-groups { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; }
.tech-group { padding: 22px 24px; border-radius: 14px; background: var(--panel); border: 1px solid var(--line); }
.tech-group h4 { font-size: 14.5px; font-weight: 700; margin-bottom: 14px; color: #fff; }
.tech-group .items { display: flex; flex-wrap: wrap; gap: 8px; }

.mod-list { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.mod { padding: 22px; border-radius: 14px; background: var(--panel); border: 1px solid var(--line); transition: .2s; }
.mod:hover { border-color: color-mix(in srgb, var(--accent) 50%, transparent); background: var(--panel-2); }
.mod h4 { font-size: 15.5px; font-weight: 800; margin-bottom: 10px; display: flex; align-items: center; gap: 9px; }
.mod h4 .n { font-size: 12px; color: var(--brand-2); font-weight: 700; }
.mod p { font-size: 13.5px; color: var(--txt-2); }

.hl-list { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; }
.hl { display: flex; gap: 16px; padding: 20px 22px; border-radius: 14px; background: var(--panel); border: 1px solid var(--line); }
.hl .ic { flex: 0 0 42px; height: 42px; border-radius: 11px; display: grid; place-items: center; font-size: 20px; background: var(--accent-soft); border: 1px solid var(--line); }
.hl h4 { font-size: 15px; font-weight: 800; margin-bottom: 6px; }
.hl p { font-size: 13.5px; color: var(--txt-2); }

.ends-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.end { padding: 22px; border-radius: 14px; background: var(--panel); border: 1px solid var(--line); text-align: center; }
.end .ic { font-size: 28px; margin-bottom: 10px; }
.end h4 { font-size: 15px; font-weight: 800; margin-bottom: 6px; }
.end p { font-size: 13px; color: var(--txt-2); }

.cta-band {
  display: flex; align-items: center; justify-content: space-between; gap: 26px; flex-wrap: wrap;
  padding: 34px 40px; border-radius: 18px; border: 1px solid var(--line-2);
  background: linear-gradient(120deg, rgba(47,107,255,.18), rgba(0,194,255,.07));
}
.cta-band h3 { font-size: 21px; font-weight: 900; margin-bottom: 6px; }
.cta-band p { color: var(--txt-2); font-size: 14.5px; }
.cta-band .actions { display: flex; gap: 12px; align-items: center; flex-wrap: wrap; }

/* ---------------- FAQ ---------------- */
.faq-list { max-width: 880px; margin: 0 auto; display: grid; gap: 12px; }
.faq { border: 1px solid var(--line); border-radius: 14px; background: var(--panel); overflow: hidden; }
.faq summary {
  cursor: pointer; padding: 18px 22px; font-size: 15.5px; font-weight: 700; color: #fff;
  list-style: none; display: flex; align-items: center; justify-content: space-between; gap: 14px;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; font-size: 20px; color: var(--brand-2); font-weight: 700; transition: transform .2s; }
.faq[open] summary::after { transform: rotate(45deg); }
.faq p { padding: 0 22px 20px; color: var(--txt-2); font-size: 14.5px; }

/* ---------------- 友情链接 ---------------- */
.link-grid { display: flex; flex-wrap: wrap; justify-content: center; gap: 14px; }
.link-item {
  display: flex; flex-direction: column; gap: 3px;
  min-width: 190px; padding: 16px 22px; border-radius: 14px;
  background: var(--panel); border: 1px solid var(--line); transition: .22s;
}
.link-item:hover { border-color: var(--brand); background: var(--accent-soft); transform: translateY(-3px); }
.link-item .ln { font-size: 15px; font-weight: 700; color: #fff; }
.link-item .lu { font-size: 12.5px; color: var(--txt-3); }

/* ---------------- 返回顶部 ---------------- */
.to-top {
  position: fixed; right: 26px; bottom: 30px; z-index: 60;
  width: 46px; height: 46px; border-radius: 50%; padding: 0;
  display: grid; place-items: center; cursor: pointer;
  color: #fff; font-size: 20px; line-height: 1;
  background: linear-gradient(135deg, var(--brand), var(--brand-2));
  border: 1px solid rgba(255, 255, 255, .18);
  box-shadow: 0 14px 30px -12px rgba(47, 107, 255, .95);
  opacity: 0; transform: translateY(14px); pointer-events: none;
  transition: opacity .25s, transform .25s, filter .2s;
}
.to-top.show { opacity: 1; transform: translateY(0); pointer-events: auto; }
.to-top.show:hover { transform: translateY(-3px); filter: brightness(1.1); }

@media (max-width: 720px) {
  .to-top { right: 16px; bottom: 20px; width: 42px; height: 42px; font-size: 18px; }
}

/* ---------------- Responsive ---------------- */
@media (max-width: 1024px) {
  .grid, .feats, .mod-list, .overview-grid { grid-template-columns: repeat(2, 1fr); }
  .p-hero .head { grid-template-columns: 1fr; }
  .p-hero .banner { width: 100%; max-width: 420px; }
  .p-hero .hero-cta { flex-direction: row; }
  .contact-box { grid-template-columns: 1fr; gap: 28px; }
  .ends-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 720px) {
  .nav { position: fixed; top: 68px; left: 0; right: 0; flex-direction: column; gap: 4px; align-items: stretch;
    padding: 14px 24px 22px; background: rgba(7,11,24,.98); border-bottom: 1px solid var(--line);
    transform: translateY(-140%); transition: transform .3s; }
  .nav.open { transform: translateY(0); }
  .nav a { padding: 12px 0; border-bottom: 1px solid var(--line); }
  .nav .btn-sm { text-align: center; margin-top: 10px; }
  .burger { display: block; }
  .grid, .feats, .mod-list, .overview-grid, .tech-groups, .hl-list, .stats, .p-stats, .ends-grid { grid-template-columns: 1fr; }
  .stats { grid-template-columns: repeat(2, 1fr); }
  .hero { padding: 60px 0 50px; }
  .section { padding: 52px 0; }
  .contact-box { padding: 30px 24px; }
  .cta-band { padding: 26px; }
  .site-footer .cols { gap: 34px; }
}