/* ==========================================================
   产品与服务页
   层次：服务全景（链路）→ 服务详情（图文交替）→ 常见组合 → 合作流程
   颜色全部取自 theme.css 的变量
   ========================================================== */

/* ---------- 01 服务全景：六个环节的链路 ---------- */
.svc-overview .section-head { margin-bottom: 3.5rem; }
.chain {
  position: relative;
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 0 1rem;
}
.chain::before {                       /* 贯穿各节点的轨道 */
  content: ""; position: absolute; left: 0; right: 0; top: .5rem;
  height: 1px; background: var(--line-strong);
}
.chain a {
  position: relative;
  display: flex; flex-direction: column; gap: .35rem;
  padding: 2.25rem 0 0;
  color: var(--text);
}
.chain a::before {                     /* 节点 */
  content: ""; position: absolute; top: 0; left: 0;
  width: 1rem; height: 1rem; border-radius: 50%;
  background: var(--white); border: 2px solid var(--line-strong);
  transition: border-color .2s, background-color .2s;
}
.chain__no { font-size: 1.0625rem; font-weight: 600; letter-spacing: .04em; color: var(--metal); }
.chain b { font-size: 1.375rem; font-weight: 700; line-height: 1.4; transition: color .2s; }
.chain small { font-size: .9375rem; color: var(--muted); }
.chain em {
  align-self: flex-start;
  margin-top: .5rem; padding: .15rem .6rem;
  font-style: normal; font-size: .8125rem; letter-spacing: .06em;
  color: #fff; background: var(--brand-red); border-radius: 2px;
}
.chain a:hover b { color: var(--brand-red); }
.chain a:hover::before { border-color: var(--text); }
.chain .is-core a::before { background: var(--brand-red); border-color: var(--brand-red); box-shadow: 0 0 0 5px rgba(200, 16, 46, .12); }

/* ---------- 02 服务详情：图文交替 ---------- */
.svc-blocks { display: grid; gap: 1.5rem; }
.svc-block {
  display: grid;
  grid-template-columns: minmax(0, 5fr) minmax(0, 6fr);
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 10px;
  overflow: hidden;
  scroll-margin-top: calc(var(--nav-h) + 1.5rem);
}
.svc-block:nth-child(even) { grid-template-columns: minmax(0, 6fr) minmax(0, 5fr); }
.svc-block:nth-child(even) .svc-block__art { order: 2; }
.svc-block.is-core { border-color: var(--line-strong); box-shadow: 0 18px 45px rgba(15, 17, 21, .07); }

/* 示意图面板：与技术页设备图同一风格 */
.svc-block__art {
  position: relative;
  margin: 0;
  display: flex; flex-direction: column; justify-content: center;
  padding: 2rem 2rem 1.25rem;
  background-color: var(--graphite);
  background-image:
    linear-gradient(rgba(255, 255, 255, .045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, .045) 1px, transparent 1px);
  background-size: 24px 24px;
}
.svc-block__art figcaption {
  margin-top: .75rem; font-size: .8125rem; letter-spacing: .14em; color: var(--muted-on-dark);
}
.ill { width: 100%; height: auto; }
.ill .l { fill: none; stroke: #9aa0a8; stroke-width: 1.5; stroke-linejoin: round; stroke-linecap: round; }
.ill .thin { stroke-width: 1; }
.ill .d { stroke-dasharray: 5 5; }
.ill .m { fill: #9ea3aa; }
.ill .f { fill: #3b4048; }
.ill .g { fill: var(--graphite); }
.ill .dot { fill: #4a4f57; }
.ill .h { fill: none; stroke: var(--laser-soft); stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }
.ill .h.thin { stroke-width: 1.2; }
.ill .hf { fill: var(--laser-soft); }
.ill .glow { fill: rgba(239, 90, 99, .35); }
.ill .pt { fill: none; stroke: #6e737c; stroke-width: 1.2; }
.ill .pt-in { fill: #c9ccd1; }
.ill .t { fill: var(--muted-on-dark); font: 500 12px var(--font-mono); letter-spacing: .08em; }
.ill .tc { fill: #d3d6da; font: 500 14px var(--font-sans); }
.ill .hl { fill: var(--laser-soft); }

.svc-block__body { padding: clamp(1.75rem, 3.2vw, 3rem); }
.svc-block__meta { display: flex; align-items: center; gap: .9rem; margin-bottom: 1rem; }
.svc-block__no { font-size: 2.25rem; line-height: 1; font-weight: 500; color: var(--line-strong); }
.svc-block__stage {
  font-size: .875rem; letter-spacing: .08em; color: var(--muted);
  padding-left: .9rem; border-left: 1px solid var(--line);
}
.svc-block__core {
  font-size: .8125rem; letter-spacing: .06em; color: #fff;
  background: var(--brand-red); padding: .15rem .6rem; border-radius: 2px;
}
.svc-block h3 { font-size: clamp(1.625rem, 2.2vw, 2.125rem); line-height: 1.35; }
.svc-block__lead {
  margin-top: .9rem; max-width: 34rem;
  font-size: var(--copy-size); line-height: 1.85; color: var(--text);
}
.svc-block__cols {
  display: grid; grid-template-columns: 1fr 1fr; gap: 1.5rem 2.5rem;
  margin-top: 1.75rem; padding-top: 1.5rem; border-top: 1px solid var(--line);
}
.svc-block__cols h4 {
  margin: 0 0 .8rem; font-size: .875rem; font-weight: 600; letter-spacing: .12em; color: var(--metal);
}
.svc-block__cols ul { display: grid; gap: .6rem; }
.svc-block__cols li { position: relative; padding-left: 1.4rem; font-size: 1rem; line-height: 1.7; color: var(--muted); }
.svc-block__do li::before {
  content: ""; position: absolute; left: 0; top: .8em; width: .6rem; height: 2px; background: var(--brand-red);
}
.svc-block__get li { color: var(--text); }
.svc-block__get li::before {           /* 交付成果：勾选标记 */
  content: ""; position: absolute; left: .1rem; top: .45em;
  width: .45rem; height: .75rem;
  border: solid var(--text); border-width: 0 2px 2px 0;
  transform: rotate(40deg);
}
.svc-block__materials {
  display: flex; flex-wrap: wrap; gap: .5rem;
  margin-top: 1.5rem;
}
.svc-block__materials li {
  display: inline-flex; align-items: center; gap: .5rem;
  padding: .35rem .75rem .35rem .4rem;
  font-size: .9375rem; color: var(--text);
  background: var(--paper); border: 1px solid var(--line); border-radius: 3px;
}
.svc-block__materials i {
  font-style: normal; font-size: .8125rem;
  width: 1.75rem; height: 1.75rem; display: inline-grid; place-items: center;
  background: var(--white); border: 1px solid var(--line-strong); border-radius: 2px;
}

/* ---------- 03 常见组合 ---------- */
.bundles { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1.25rem; }
.bundle {
  display: flex; flex-direction: column;
  padding: 2rem 2rem 1.75rem;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 10px;
}
.bundle__fit { font-size: .9375rem; color: var(--metal); letter-spacing: .04em; }
.bundle h3 { margin-top: .6rem; font-size: 1.75rem; }
.bundle__desc { margin-top: .8rem; font-size: 1rem; line-height: 1.85; color: var(--muted); flex: 1; }
.bundle__track {
  display: grid; grid-template-columns: repeat(6, 1fr); gap: 4px;
  margin-top: 1.75rem;
}
.bundle__track li { display: flex; flex-direction: column; gap: .5rem; }
.bundle__track li::before {            /* 进度格 */
  content: ""; height: 6px; border-radius: 1px; background: var(--paper-2);
}
.bundle__track li.on::before { background: var(--text); }
.bundle__track li.on.core::before { background: var(--brand-red); }
.bundle__track span { font-size: .875rem; line-height: 1.3; color: #9a9ea5; text-align: center; white-space: nowrap; }
.bundle__track li.on span { color: var(--text); font-weight: 600; }
.bundle__note {
  margin-top: 1.5rem; padding-top: 1.25rem; border-top: 1px solid var(--line);
  font-size: .9375rem; line-height: 1.7; color: var(--text);
}

/* ---------- 响应式 ---------- */
@media (max-width: 1080px) {
  .chain b { font-size: 1.125rem; }
  .chain small { font-size: .875rem; }
  .svc-block { grid-template-columns: minmax(0, 1fr) minmax(0, 1.2fr); }
  .svc-block:nth-child(even) { grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr); }
  .bundle { padding: 1.75rem 1.5rem; }
}
@media (max-width: 880px) {
  .chain { grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 2rem 1rem; }
  .chain::before { display: none; }
  .chain a { padding-top: 1.75rem; border-top: 1px solid var(--line-strong); }
  .chain a::before { top: -.5rem; }
  .svc-block, .svc-block:nth-child(even) { grid-template-columns: 1fr; }
  .svc-block:nth-child(even) .svc-block__art { order: 0; }
  .svc-block__art { padding: 1.5rem 1.5rem 1rem; }
  .ill { max-width: 32rem; margin: 0 auto; }
  .bundles { grid-template-columns: 1fr; }
}
@media (max-width: 640px) {
  .chain { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .svc-block__cols { grid-template-columns: 1fr; gap: 1.25rem; }
  .svc-block__no { font-size: 1.875rem; }
  .bundle__track span { font-size: .8125rem; }
}