/* =====================================================
   digitalcity.css —— 数字城市研究院
   第四套视觉语言：「城市总图 · 工程图则」
   区别于：embodied（明亮卡片栅格）/ spacetime（深浅交替编辑式·橙）
          / energy（全暗松黑绿控制台）
   本套：纸白图则底 + 制图网格 + 四色地铁线系统
        L1 蓝 / L2 青 / L3 品红 / L4 朱红
        左侧固定线网图 ScrollSpy · 图签式标题区
   ===================================================== */
:root {
  --dc-paper: #f4f6f3;
  --dc-paper2: #ecf0ea;
  --dc-ink: #17222e;
  --dc-ink2: #48586a;
  --dc-ink3: #8a98a8;
  --dc-line: #c9d2cf;
  --dc-line2: #aeb9b5;
  --dc-grid: rgba(23, 34, 46, .055);
  --dc-l1: #165dff;
  --dc-l2: #0d9e8e;
  --dc-l3: #c2417f;
  --dc-l4: #e0492f;
  --dc-seal: #c03325;
  --dc-night: #0e1b2a;
  --dc-disp: 'Space Grotesk', 'Noto Sans SC', system-ui, sans-serif;
  --dc-mono: 'Consolas', 'SFMono-Regular', Menlo, monospace;
}

/* 整页图则底：纸白 + 制图网格 */
.dc-page {
  background-color: var(--dc-paper);
  background-image:
    linear-gradient(var(--dc-grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--dc-grid) 1px, transparent 1px),
    linear-gradient(rgba(23,34,46,.09) 1px, transparent 1px),
    linear-gradient(90deg, rgba(23,34,46,.09) 1px, transparent 1px);
  background-size: 24px 24px, 24px 24px, 120px 120px, 120px 120px;
}

/* ---------- 通用：滚动显现 ---------- */
.rv { opacity: 0; transform: translateY(26px); transition: opacity .7s ease, transform .7s cubic-bezier(.22,.8,.3,1); }
.rv.in { opacity: 1; transform: none; }
.rv[data-d="1"] { transition-delay: .08s; }
.rv[data-d="2"] { transition-delay: .16s; }
.rv[data-d="3"] { transition-delay: .24s; }
.rv[data-d="4"] { transition-delay: .32s; }
.rv[data-d="5"] { transition-delay: .4s; }

/* =====================================================
   左侧地铁线网 ScrollSpy 导航轨（桌面固定）
   ===================================================== */
.dc-metrorail {
  position: fixed;
  left: 26px; top: 50%;
  transform: translateY(-50%);
  z-index: 60;
  display: flex; flex-direction: column;
  padding: 14px 0 14px 0;
}
.dc-metrorail::before {
  content: ""; position: absolute; left: 7px; top: 8px; bottom: 8px;
  width: 3px; border-radius: 2px;
  background: linear-gradient(180deg, var(--dc-l1) 0%, var(--dc-l1) 24%, var(--dc-l2) 26%, var(--dc-l2) 50%, var(--dc-l3) 52%, var(--dc-l3) 75%, var(--dc-l4) 77%, var(--dc-l4) 100%);
  opacity: .9;
}
.dc-metrorail a {
  position: relative;
  display: flex; align-items: center;
  margin: 7px 0; padding-left: 22px;
  font-family: var(--dc-mono); font-size: 10.5px; letter-spacing: .12em;
  color: var(--dc-ink3); text-decoration: none;
  white-space: nowrap;
  transition: color .25s ease, transform .25s ease;
}
.dc-metrorail a i {
  position: absolute; left: 1.5px;
  width: 14px; height: 14px; border-radius: 50%;
  background: var(--dc-paper); border: 3px solid var(--dc-ink3);
  box-sizing: border-box;
  transition: border-color .25s ease, transform .25s ease, box-shadow .25s ease;
}
.dc-metrorail a:hover { color: var(--dc-ink); transform: translateX(2px); }
.dc-metrorail a.on { color: var(--dc-ink); font-weight: 700; transform: translateX(3px); }
.dc-metrorail a.on i { border-color: var(--c, var(--dc-l1)); transform: scale(1.25); box-shadow: 0 0 0 4px color-mix(in srgb, var(--c, var(--dc-l1)) 18%, transparent); }
@media (max-width: 1240px) { .dc-metrorail { display: none; } }

/* =====================================================
   图签式章节标题区（DWG 标题栏）
   ===================================================== */
.dc-sec { position: relative; padding: 96px 24px; scroll-margin-top: 84px; }
.dc-sec .wrap { max-width: 1180px; margin: 0 auto; position: relative; }
@media (min-width: 1241px) { .dc-sec .wrap { max-width: 1120px; } }

.dc-tb {
  display: grid; grid-template-columns: auto 1fr auto;
  align-items: stretch;
  border: 2px solid var(--dc-ink);
  background: var(--dc-paper);
  box-shadow: 6px 6px 0 rgba(23,34,46,.10);
  margin-bottom: 54px;
}
.dc-tb-no {
  display: flex; flex-direction: column; justify-content: center; align-items: center;
  padding: 14px 22px; border-right: 2px solid var(--dc-ink);
  font-family: var(--dc-mono);
}
.dc-tb-no .dwg { font-size: 10px; letter-spacing: .3em; color: var(--dc-ink3); }
.dc-tb-no .num { font-family: var(--dc-disp); font-size: 30px; font-weight: 700; line-height: 1; margin-top: 4px; color: var(--dc-ink); }
.dc-tb-mid { padding: 16px 24px; border-right: 2px solid var(--dc-ink); }
.dc-tb-mid .k { font-family: var(--dc-mono); font-size: 10.5px; letter-spacing: .32em; color: var(--c, var(--dc-l1)); margin-bottom: 6px; }
.dc-tb-mid h2 { font-family: var(--dc-disp); font-size: clamp(24px, 3.4vw, 36px); font-weight: 700; color: var(--dc-ink); letter-spacing: .01em; line-height: 1.2; }
.dc-tb-side {
  display: flex; flex-direction: column; justify-content: space-between;
  padding: 12px 18px; min-width: 150px;
  font-family: var(--dc-mono); font-size: 10px; letter-spacing: .14em; color: var(--dc-ink3);
}
.dc-tb-side .rev { color: var(--dc-ink); font-weight: 700; }
.dc-tb-side .seal {
  align-self: flex-end; margin-top: 6px;
  width: 44px; height: 44px; border: 2px solid var(--dc-seal); border-radius: 4px;
  color: var(--dc-seal); font-size: 10px; font-weight: 700; letter-spacing: .08em;
  display: grid; place-items: center; transform: rotate(-8deg);
  opacity: .85;
}
@media (max-width: 820px) {
  .dc-tb { grid-template-columns: auto 1fr; }
  .dc-tb-side { display: none; }
}

/* ---------- 印章（圆形篆意） ---------- */
.dc-stamp {
  width: 118px; height: 118px; border-radius: 50%;
  border: 2.5px solid var(--dc-seal);
  color: var(--dc-seal);
  display: grid; place-items: center; text-align: center;
  font-family: var(--dc-disp); font-weight: 700; font-size: 15px; letter-spacing: .1em; line-height: 1.5;
  position: relative; flex: none;
  animation: dcSpin 26s linear infinite;
}
.dc-stamp::after {
  content: ""; position: absolute; inset: 7px; border-radius: 50%;
  border: 1px dashed var(--dc-seal); opacity: .7;
}
.dc-stamp span { animation: dcSpinBack 26s linear infinite; }
@keyframes dcSpin { to { transform: rotate(360deg); } }
@keyframes dcSpinBack { to { transform: rotate(-360deg); } }

/* =====================================================
   ① HERO —— 城市总图（左：图签信息 / 右：昼夜城市地图）
   ===================================================== */
.dc-hero {
  position: relative; overflow: hidden;
  padding: 150px 24px 0;
  background: var(--dc-paper);
}
.dc-hero .wrap { max-width: 1180px; margin: 0 auto; }
@media (min-width: 1241px) { .dc-hero .wrap { max-width: 1120px; } }

/* 图框四角 + 指北针 */
.dc-frame { position: absolute; inset: 14px; pointer-events: none; border: 1.5px solid rgba(23,34,46,.18); }
.dc-frame i { position: absolute; width: 22px; height: 22px; border: 0 solid var(--dc-ink); }
.dc-frame i:nth-child(1) { top: -2px; left: -2px; border-top-width: 4px; border-left-width: 4px; }
.dc-frame i:nth-child(2) { top: -2px; right: -2px; border-top-width: 4px; border-right-width: 4px; }
.dc-frame i:nth-child(3) { bottom: -2px; left: -2px; border-bottom-width: 4px; border-left-width: 4px; }
.dc-frame i:nth-child(4) { bottom: -2px; right: -2px; border-bottom-width: 4px; border-right-width: 4px; }
.dc-north {
  position: absolute; top: 44px; right: 44px;
  width: 74px; height: 74px; z-index: 3; opacity: .85;
}
.dc-north svg { width: 100%; height: 100%; }

.dc-hero-grid {
  display: grid; grid-template-columns: 1.02fr 1.15fr; gap: 56px; align-items: center;
  padding-bottom: 44px;
}

/* 左：图签信息板 */
.dc-hero-status {
  display: inline-flex; align-items: center; gap: 10px;
  font-family: var(--dc-mono); font-size: 11px; letter-spacing: .3em; color: var(--dc-ink2);
  border: 1px solid var(--dc-line2); padding: 7px 14px; background: #fff;
}
.dc-hero-status i { width: 8px; height: 8px; border-radius: 50%; background: var(--dc-l2); animation: dcBlink 1.6s infinite; }
@keyframes dcBlink { 50% { opacity: .25; } }

.dc-hero-title {
  margin-top: 26px;
  font-family: var(--dc-disp); font-weight: 700;
  font-size: clamp(42px, 5.6vw, 66px); line-height: 1.08; color: var(--dc-ink);
}
.dc-hero-title .row { display: block; }
.dc-hero-title .l1 { color: var(--dc-l1); }
.dc-hero-title .hollow {
  color: transparent; -webkit-text-stroke: 2px var(--dc-ink);
}
.dc-hero-title .dotl4 { color: var(--dc-l4); }

.dc-hero-desc { margin-top: 22px; max-width: 46ch; font-size: 15.5px; line-height: 2; color: var(--dc-ink2); }
.dc-hero-desc b { color: var(--dc-ink); }

.dc-hero-legend { margin-top: 26px; display: flex; flex-wrap: wrap; gap: 10px; }
.dc-hero-legend span {
  display: inline-flex; align-items: center; gap: 8px;
  font-family: var(--dc-mono); font-size: 11px; letter-spacing: .12em; color: var(--dc-ink2);
  background: #fff; border: 1px solid var(--dc-line); padding: 8px 13px;
  transition: transform .2s ease, box-shadow .2s ease;
}
.dc-hero-legend span:hover { transform: translateY(-2px); box-shadow: 3px 3px 0 rgba(23,34,46,.12); }
.dc-hero-legend i { width: 16px; height: 4px; border-radius: 2px; background: var(--c); }

.dc-hero-cta { margin-top: 30px; display: flex; gap: 14px; flex-wrap: wrap; }
.dc-btn {
  display: inline-flex; align-items: center; gap: 10px;
  font-family: var(--dc-disp); font-weight: 700; font-size: 14px; letter-spacing: .06em;
  padding: 14px 26px; text-decoration: none; border: 2px solid var(--dc-ink);
  transition: all .22s ease; cursor: pointer; background: #fff; color: var(--dc-ink);
}
.dc-btn--solid { background: var(--dc-ink); color: #fff; }
.dc-btn--solid:hover { background: var(--dc-l1); border-color: var(--dc-l1); transform: translateY(-2px); box-shadow: 5px 5px 0 rgba(22,93,255,.28); }
.dc-btn--ghost:hover { border-color: var(--dc-l4); color: var(--dc-l4); transform: translateY(-2px); box-shadow: 5px 5px 0 rgba(224,73,47,.2); }

/* 右：城市地图面板（SVG） */
.dc-map {
  position: relative;
  border: 2px solid var(--dc-ink); background: #fff;
  box-shadow: 10px 10px 0 rgba(23,34,46,.10);
  transition: background .6s ease;
}
.dc-map-bar {
  display: flex; align-items: center; justify-content: space-between;
  padding: 10px 16px; border-bottom: 2px solid var(--dc-ink);
  font-family: var(--dc-mono); font-size: 11px; letter-spacing: .18em; color: var(--dc-ink2);
}
.dc-map-bar .left { display: flex; align-items: center; gap: 8px; }
.dc-map-bar i { width: 9px; height: 9px; border-radius: 50%; }
.dc-map-bar i:nth-child(1) { background: var(--dc-l1); }
.dc-map-bar i:nth-child(2) { background: var(--dc-l2); }
.dc-map-bar i:nth-child(3) { background: var(--dc-l4); }

/* 昼夜切换拨杆 */
.dc-daynight { display: flex; align-items: center; gap: 9px; cursor: pointer; user-select: none; }
.dc-daynight .lbl { font-size: 10px; letter-spacing: .2em; color: var(--dc-ink3); }
.dc-dn-track {
  position: relative; width: 46px; height: 22px; border-radius: 12px;
  border: 1.5px solid var(--dc-ink); background: #fff; transition: background .4s ease;
}
.dc-dn-knob {
  position: absolute; top: 2.5px; left: 3px; width: 14px; height: 14px; border-radius: 50%;
  background: var(--dc-l4); transition: transform .35s cubic-bezier(.3,1.4,.4,1);
}
.dc-map.night .dc-dn-knob { transform: translateX(24px); background: #ffd66b; }
.dc-map.night .dc-dn-track { background: var(--dc-night); }

.dc-map-body { position: relative; }
.dc-map-body svg { display: block; width: 100%; height: auto; }

/* 地图昼夜两套皮肤 */
.dc-map .m-bg { fill: #ffffff; transition: fill .6s ease; }
.dc-map .m-grid { stroke: rgba(23,34,46,.07); }
.dc-map .m-river { fill: rgba(13,158,142,.10); stroke: rgba(13,158,142,.35); transition: all .6s ease; }
.dc-map .m-block { fill: #eef1ec; stroke: #d3dad2; stroke-width: 1; transition: all .6s ease; }
.dc-map .m-block--hi { fill: #e2ecff; stroke: #b9d0ff; }
.dc-map .m-road { stroke: #ffffff; stroke-width: 5; }
.dc-map .m-roadline { stroke: #ccd4cd; stroke-width: 1; }
.dc-map .m-lbl { fill: #7d8b99; font-family: var(--dc-mono); font-size: 8.5px; letter-spacing: .08em; }
.dc-map .m-poi text { fill: var(--dc-ink); font-size: 10px; font-weight: 700; font-family: 'Noto Sans SC', sans-serif; }
.dc-map .m-poi .ring { fill: #fff; stroke-width: 2.5; }
.dc-map .m-poi .pulse { fill: none; stroke-width: 1.5; opacity: 0; animation: dcPoi 2.8s ease-out infinite; }

.dc-map.night .m-bg { fill: var(--dc-night); }
.dc-map.night .m-grid { stroke: rgba(255,255,255,.05); }
.dc-map.night .m-river { fill: rgba(13,158,142,.14); stroke: rgba(45,190,175,.4); }
.dc-map.night .m-block { fill: #16283c; stroke: #20344c; }
.dc-map.night .m-block--hi { fill: #173350; stroke: #27496e; }
.dc-map.night .m-road { stroke: #0a1420; }
.dc-map.night .m-roadline { stroke: #24384f; }
.dc-map.night .m-lbl { fill: #5b7290; }
.dc-map.night .m-poi text { fill: #dfe9f5; }
.dc-map.night .m-poi .ring { fill: var(--dc-night); }
@keyframes dcPoi { 0% { opacity: .8; r: 6; } 100% { opacity: 0; r: 16; } }

/* 地铁线：流动虚线 + 进车点 */
.dc-map .m-line { fill: none; stroke-width: 4; stroke-linecap: round; stroke-dasharray: 14 9; animation: dcFlow 1.6s linear infinite; }
.dc-map .m-line--l2 { animation-duration: 2s; }
.dc-map .m-line--l3 { animation-duration: 2.4s; }
@keyframes dcFlow { to { stroke-dashoffset: -46; } }
.dc-map .m-train { r: 4.5; stroke: #fff; stroke-width: 2; }
.dc-map.night .m-train { stroke: var(--dc-night); }

/* 地图悬浮读数 */
.dc-map-hud {
  position: absolute; left: 14px; bottom: 14px;
  display: flex; gap: 8px; flex-wrap: wrap;
}
.dc-map-hud span {
  font-family: var(--dc-mono); font-size: 10px; letter-spacing: .14em;
  background: rgba(255,255,255,.92); border: 1px solid var(--dc-line2); color: var(--dc-ink2);
  padding: 6px 10px;
}
.dc-map.night .dc-map-hud span { background: rgba(10,20,32,.85); border-color: #2b405a; color: #9fb4cd; }
.dc-map-hud .ok { color: var(--dc-l2); font-weight: 700; }

/* HERO 底部：线网数据轨（地铁线路图横条） */
.dc-hero-rail { border-top: 2px solid var(--dc-ink); background: #fff; }
.dc-hero-rail-in {
  max-width: 1180px; margin: 0 auto;
  display: grid; grid-template-columns: repeat(4, 1fr);
}
@media (min-width: 1241px) { .dc-hero-rail-in { max-width: 1120px; } }
.dc-hero-rail-cell {
  position: relative; padding: 26px 26px 24px;
  border-right: 1px solid var(--dc-line);
}
.dc-hero-rail-cell:last-child { border-right: 0; }
.dc-hero-rail-cell::before {
  content: ""; position: absolute; top: -2px; left: 0; height: 4px; width: 100%;
  background: var(--c, var(--dc-l1));
  transform: scaleX(.3); transform-origin: left; transition: transform .5s ease;
}
.dc-hero-rail-cell:hover::before { transform: scaleX(1); }
.dc-hero-rail-cell .k { font-family: var(--dc-mono); font-size: 10.5px; letter-spacing: .18em; color: var(--dc-ink3); }
.dc-hero-rail-cell .v { margin-top: 10px; font-family: var(--dc-disp); font-weight: 700; font-size: 34px; color: var(--dc-ink); line-height: 1; }
.dc-hero-rail-cell .v small { font-size: 14px; font-weight: 600; color: var(--dc-ink2); margin-left: 4px; letter-spacing: .06em; }
.dc-hero-rail-cell .s { margin-top: 8px; font-size: 11.5px; color: var(--dc-ink3); letter-spacing: .04em; }

/* =====================================================
   ② 业务总览 —— 四条地铁线（横向线路图导航）
   ===================================================== */
.dc-linesec { padding-top: 78px; }
.dc-lines { display: flex; flex-direction: column; gap: 16px; }
.dc-linerow {
  position: relative; display: grid; grid-template-columns: 190px 1fr auto;
  align-items: center; gap: 0;
  background: #fff; border: 1.5px solid var(--dc-line);
  padding: 0; text-decoration: none;
  transition: border-color .25s ease, box-shadow .25s ease, transform .25s ease;
  overflow: hidden;
}
.dc-linerow:hover { border-color: var(--c); box-shadow: 6px 6px 0 color-mix(in srgb, var(--c) 22%, transparent); transform: translateX(4px); }
.dc-linerow .badge {
  display: flex; align-items: center; gap: 10px;
  padding: 22px 20px; border-right: 1.5px solid var(--dc-line);
  height: 100%;
  background: color-mix(in srgb, var(--c) 7%, #fff);
}
.dc-linerow .badge .circle {
  width: 34px; height: 34px; border-radius: 50%; background: var(--c); color: #fff;
  display: grid; place-items: center; font-family: var(--dc-mono); font-weight: 700; font-size: 12px; flex: none;
}
.dc-linerow .badge .t { font-family: var(--dc-mono); font-size: 10px; letter-spacing: .22em; color: var(--dc-ink2); }
.dc-linerow .main { display: flex; align-items: center; gap: 18px; padding: 20px 26px; min-width: 0; }
.dc-linerow .track { position: relative; flex: 1; height: 6px; border-radius: 3px; background: color-mix(in srgb, var(--c) 22%, #fff); overflow: visible; }
.dc-linerow .track::after {
  content: ""; position: absolute; left: 0; top: 0; height: 100%; width: 0;
  border-radius: 3px; background: var(--c); transition: width .5s ease;
}
.dc-linerow:hover .track::after { width: 100%; }
.dc-linerow .st { position: absolute; top: 50%; width: 12px; height: 12px; border-radius: 50%; background: #fff; border: 3px solid var(--c); transform: translate(-50%,-50%); box-sizing: border-box; }
.dc-linerow .name { font-family: var(--dc-disp); font-weight: 700; font-size: 19px; color: var(--dc-ink); white-space: nowrap; }
.dc-linerow .sub { font-size: 12px; color: var(--dc-ink3); white-space: nowrap; }
.dc-linerow .go {
  padding: 0 26px; font-family: var(--dc-mono); font-size: 12px; letter-spacing: .2em;
  color: var(--dc-ink3); transition: color .25s ease, transform .25s ease; white-space: nowrap;
}
.dc-linerow:hover .go { color: var(--c); transform: translateX(4px); }
@media (max-width: 880px) {
  .dc-linerow { grid-template-columns: 1fr; }
  .dc-linerow .badge { border-right: 0; border-bottom: 1.5px solid var(--dc-line); padding: 14px 20px; }
  .dc-linerow .go { padding: 0 20px 16px; }
  .dc-linerow .main { flex-wrap: wrap; }
  .dc-linerow .track { display: none; }
}

/* =====================================================
   ③ L1 智慧校园 —— 支撑体系（校园大脑分层图）
   ===================================================== */
.dc-campus { display: grid; grid-template-columns: 300px 1fr; gap: 40px; align-items: start; }
.dc-campus-side { position: sticky; top: 110px; }
.dc-campus-side h3 { font-family: var(--dc-disp); font-size: 26px; font-weight: 700; color: var(--dc-ink); line-height: 1.4; }
.dc-campus-side p { margin-top: 16px; font-size: 14px; line-height: 2; color: var(--dc-ink2); }
.dc-campus-side .cases { margin-top: 24px; display: flex; flex-direction: column; gap: 10px; }
.dc-campus-side .cases span {
  display: flex; align-items: center; gap: 10px;
  font-size: 12.5px; color: var(--dc-ink2); border: 1px solid var(--dc-line);
  background: #fff; padding: 10px 14px;
  transition: border-color .2s ease, transform .2s ease;
}
.dc-campus-side .cases span:hover { border-color: var(--dc-l1); transform: translateX(4px); }
.dc-campus-side .cases i { width: 8px; height: 8px; background: var(--dc-l1); flex: none; transform: rotate(45deg); }

.dc-stack { display: flex; flex-direction: column; gap: 14px; }
.dc-layer {
  background: #fff; border: 1.5px solid var(--dc-line);
  transition: border-color .25s ease, box-shadow .25s ease, transform .25s ease;
}
.dc-layer:hover { border-color: var(--dc-l1); box-shadow: 5px 5px 0 rgba(22,93,255,.14); transform: translateY(-2px); }
.dc-layer-h {
  display: flex; align-items: center; gap: 14px; padding: 14px 20px;
  border-bottom: 1px dashed var(--dc-line);
}
.dc-layer-h .lv { font-family: var(--dc-mono); font-size: 11px; font-weight: 700; letter-spacing: .14em; color: #fff; background: var(--dc-l1); padding: 4px 10px; }
.dc-layer-h .lt { font-family: var(--dc-disp); font-weight: 700; font-size: 16.5px; color: var(--dc-ink); }
.dc-layer-h .ln { margin-left: auto; font-family: var(--dc-mono); font-size: 10px; letter-spacing: .2em; color: var(--dc-ink3); }
.dc-chips { display: flex; flex-wrap: wrap; gap: 8px; padding: 16px 20px; }
.dc-chips span {
  font-size: 12px; color: var(--dc-ink2); background: var(--dc-paper2);
  border: 1px solid var(--dc-line); padding: 6px 12px;
  transition: all .18s ease; cursor: default;
}
.dc-chips span:hover { background: var(--dc-l1); border-color: var(--dc-l1); color: #fff; transform: translateY(-2px); }
/* 大脑层（核心） */
.dc-layer--brain .dc-layer-h .lv { background: var(--dc-seal); }
.dc-layer--brain { border-color: rgba(192,51,37,.45); }
/* 应用层六格 */
.dc-apps { display: grid; grid-template-columns: repeat(6, 1fr); gap: 8px; padding: 16px 20px; }
.dc-apps span {
  text-align: center; font-size: 12.5px; font-weight: 600; color: var(--dc-ink);
  background: #fff; border: 1px solid var(--dc-line2); padding: 14px 6px; position: relative;
  transition: all .2s ease; cursor: default;
}
.dc-apps span::before { content: ""; position: absolute; left: 0; bottom: 0; width: 100%; height: 3px; background: var(--dc-l2); transform: scaleX(0); transition: transform .3s ease; }
.dc-apps span:hover { transform: translateY(-3px); border-color: var(--dc-l2); box-shadow: 0 6px 14px rgba(13,158,142,.14); }
.dc-apps span:hover::before { transform: scaleX(1); }
@media (max-width: 1024px) {
  .dc-campus { grid-template-columns: 1fr; }
  .dc-campus-side { position: static; }
  .dc-apps { grid-template-columns: repeat(3, 1fr); }
}

/* =====================================================
   ④ L2 智慧管线 —— 蓝图深底 + 剖面管线
   ===================================================== */
.dc-blue {
  background: #0d2742;
  background-image:
    linear-gradient(rgba(122,178,255,.07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(122,178,255,.07) 1px, transparent 1px);
  background-size: 28px 28px;
  border-top: 2px solid var(--dc-ink); border-bottom: 2px solid var(--dc-ink);
}
.dc-blue .dc-tb { background: rgba(255,255,255,.04); border-color: rgba(170,205,255,.7); box-shadow: 6px 6px 0 rgba(0,0,0,.3); }
.dc-blue .dc-tb-no { border-right-color: rgba(170,205,255,.7); }
.dc-blue .dc-tb-no .num, .dc-blue .dc-tb-mid h2 { color: #eaf2ff; }
.dc-blue .dc-tb-no .dwg { color: #7fa3d0; }
.dc-blue .dc-tb-mid { border-right-color: rgba(170,205,255,.7); }
.dc-blue .dc-tb-mid .k { color: #6fe0d3; }

.dc-pipe-grid { display: grid; grid-template-columns: 1.15fr 1fr; gap: 46px; align-items: start; }
/* 剖面图 */
.dc-section {
  border: 1.5px solid rgba(170,205,255,.5); background: rgba(8,25,46,.55); padding: 22px;
}
.dc-section svg { width: 100%; height: auto; display: block; }
.dc-section .cap {
  margin-top: 14px; font-family: var(--dc-mono); font-size: 10.5px; letter-spacing: .2em;
  color: #8fb4e0; display: flex; justify-content: space-between; flex-wrap: wrap; gap: 8px;
}
/* 管线流动 */
.dc-pline { fill: none; stroke-width: 3.5; stroke-linecap: round; stroke-dasharray: 10 7; animation: dcFlow 1.4s linear infinite; }
.dc-p-water { stroke: #4da3ff; }
.dc-p-rain { stroke: #37c8b6; animation-duration: 1.8s; }
.dc-p-gas { stroke: #ffd056; animation-duration: 2.2s; }
.dc-p-heat { stroke: #ff8a5c; animation-duration: 2s; }
.dc-p-power { stroke: #c99bff; animation-duration: 1.6s; }
.dc-dim { stroke: rgba(170,205,255,.4); stroke-width: 1; }
.dc-dim-t { fill: #8fb4e0; font-family: var(--dc-mono); font-size: 8px; }

.dc-features { display: flex; flex-direction: column; }
.dc-feature {
  display: grid; grid-template-columns: 54px 1fr; gap: 18px;
  padding: 18px 6px; border-bottom: 1px dashed rgba(170,205,255,.28);
  transition: background .25s ease, padding-left .25s ease;
}
.dc-feature:hover { background: rgba(77,163,255,.08); padding-left: 14px; }
.dc-feature:last-child { border-bottom: 0; }
.dc-feature .n {
  font-family: var(--dc-disp); font-weight: 700; font-size: 24px; line-height: 1.1;
  color: transparent; -webkit-text-stroke: 1.4px #6fe0d3;
}
.dc-feature h4 { font-family: var(--dc-disp); font-size: 16.5px; font-weight: 700; color: #eaf2ff; }
.dc-feature p { margin-top: 6px; font-size: 13px; line-height: 1.9; color: #a9c3e4; }

.dc-pipe-foot {
  margin-top: 44px; display: flex; align-items: center; gap: 26px; flex-wrap: wrap;
  border: 1.5px solid rgba(170,205,255,.5); background: rgba(8,25,46,.55); padding: 22px 28px;
}
.dc-pipe-foot .big {
  font-family: var(--dc-disp); font-weight: 700; font-size: clamp(22px, 3vw, 30px); color: #eaf2ff; line-height: 1.4;
}
.dc-pipe-foot .big em { font-style: normal; color: #6fe0d3; }
.dc-pipe-foot .tag {
  margin-left: auto; display: flex; flex-wrap: wrap; gap: 8px;
}
.dc-pipe-foot .tag span {
  font-family: var(--dc-mono); font-size: 10.5px; letter-spacing: .14em; color: #a9c3e4;
  border: 1px solid rgba(170,205,255,.35); padding: 7px 12px;
}
@media (max-width: 1024px) { .dc-pipe-grid { grid-template-columns: 1fr; } }

/* =====================================================
   ⑤ L3 IDC —— 机柜矩阵 + 建设体系
   ===================================================== */
.dc-idc-grid { display: grid; grid-template-columns: 1fr 1.05fr; gap: 46px; align-items: start; }
/* 机柜矩阵（机柜状态灯墙） */
.dc-rackwall { background: #fff; border: 1.5px solid var(--dc-line); box-shadow: 8px 8px 0 rgba(23,34,46,.08); }
.dc-rackwall-bar {
  display: flex; align-items: center; justify-content: space-between;
  padding: 12px 18px; border-bottom: 1.5px solid var(--dc-line);
  font-family: var(--dc-mono); font-size: 11px; letter-spacing: .16em; color: var(--dc-ink2);
}
.dc-rackwall-bar b { color: var(--dc-l3); }
.dc-racks { display: grid; grid-template-columns: repeat(10, 1fr); gap: 7px; padding: 20px; }
.dc-rack {
  aspect-ratio: 1/1.5; border: 1.5px solid var(--dc-line2); background: var(--dc-paper2);
  position: relative; display: flex; flex-direction: column; justify-content: flex-end; padding: 5px;
  transition: all .2s ease; cursor: default;
}
.dc-rack::before {
  content: ""; position: absolute; top: 5px; left: 5px; width: 6px; height: 6px; border-radius: 50%;
  background: var(--dc-l2); animation: dcBlink 2s infinite;
}
.dc-rack.hot::before { background: var(--dc-l4); animation-duration: 1s; }
.dc-rack i { height: 3px; background: rgba(194,65,127,.5); margin-top: 3px; }
.dc-rack:hover { border-color: var(--dc-l3); transform: translateY(-3px) scale(1.06); box-shadow: 0 8px 16px rgba(194,65,127,.2); z-index: 2; }
.dc-racklegend { display: flex; gap: 18px; padding: 0 20px 18px; font-family: var(--dc-mono); font-size: 10px; letter-spacing: .14em; color: var(--dc-ink3); }
.dc-racklegend i { display: inline-block; width: 8px; height: 8px; border-radius: 50%; margin-right: 6px; vertical-align: 0; }
.dc-racklegend .g i { background: var(--dc-l2); } .dc-racklegend .r i { background: var(--dc-l4); }
/* 丽水数据卡 */
.dc-lscard {
  margin-top: 16px; display: grid; grid-template-columns: repeat(3,1fr);
  border: 1.5px solid var(--dc-line); background: #fff;
}
.dc-lscard .cell { padding: 18px 16px; border-right: 1px solid var(--dc-line); }
.dc-lscard .cell:last-child { border-right: 0; }
.dc-lscard .k { font-family: var(--dc-mono); font-size: 10px; letter-spacing: .16em; color: var(--dc-ink3); }
.dc-lscard .v { margin-top: 8px; font-family: var(--dc-disp); font-weight: 700; font-size: 26px; color: var(--dc-ink); }
.dc-lscard .v small { font-size: 12px; color: var(--dc-ink2); font-weight: 600; }
/* 建设体系 */
.dc-build { display: flex; flex-direction: column; }
.dc-build-h {
  font-family: var(--dc-mono); font-size: 11px; letter-spacing: .26em; color: var(--dc-ink2);
  padding: 10px 0 10px 18px; border-left: 4px solid var(--dc-l3); background: #fff;
  border-top: 1px solid var(--dc-line); border-bottom: 1px solid var(--dc-line); border-right: 1px solid var(--dc-line);
}
.dc-build-row { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1px; background: var(--dc-line); border: 1px solid var(--dc-line); margin-top: 12px; }
.dc-build-row .item {
  background: #fff; padding: 16px 14px; text-align: center; font-size: 12.5px; color: var(--dc-ink2);
  transition: all .2s ease; cursor: default;
}
.dc-build-row .item:hover { background: var(--dc-l3); color: #fff; transform: translateY(-2px); }
.dc-cases {
  margin-top: 26px; display: flex; flex-wrap: wrap; gap: 9px;
}
.dc-cases span {
  font-size: 12px; color: var(--dc-ink2); background: #fff; border: 1px solid var(--dc-line);
  padding: 8px 13px; transition: all .2s ease; cursor: default;
}
.dc-cases span::before { content: "◆ "; color: var(--dc-l3); font-size: 9px; }
.dc-cases span:hover { border-color: var(--dc-l3); color: var(--dc-l3); transform: translateY(-2px); }
@media (max-width: 1024px) { .dc-idc-grid { grid-template-columns: 1fr; } .dc-build-row { grid-template-columns: repeat(2,1fr); } }

/* =====================================================
   ⑥ L4 轨道交通 —— 线路板（站点列表）
   ===================================================== */
.dc-metro-board {
  position: relative; background: #fff; border: 1.5px solid var(--dc-line);
  box-shadow: 8px 8px 0 rgba(23,34,46,.08); padding: 34px 30px 30px;
}
.dc-metro-board::before {
  content: ""; position: absolute; left: 133.5px; top: 34px; bottom: 30px; width: 5px; border-radius: 3px;
  background: linear-gradient(180deg, var(--dc-l4), #ff8a5c);
}
.dc-station {
  position: relative; display: grid; grid-template-columns: 96px 1fr auto; gap: 20px; align-items: center;
  padding: 15px 0 15px 0; transition: transform .2s ease;
}
.dc-station:hover { transform: translateX(6px); }
.dc-station .city {
  font-family: var(--dc-disp); font-weight: 700; font-size: 15.5px; color: var(--dc-ink); text-align: right;
}
.dc-station .node {
  position: absolute; left: 136px; top: 50%; transform: translate(-50%,-50%);
  width: 18px; height: 18px; border-radius: 50%; background: #fff; border: 5px solid var(--dc-l4); box-sizing: border-box;
  transition: transform .25s ease, box-shadow .25s ease;
}
.dc-station:hover .node { transform: translate(-50%,-50%) scale(1.3); box-shadow: 0 0 0 6px rgba(224,73,47,.15); }
.dc-station .line-name { padding-left: 40px; font-size: 13.5px; color: var(--dc-ink2); }
.dc-station .line-name b { color: var(--dc-ink); font-weight: 700; }
.dc-station .sys {
  font-family: var(--dc-mono); font-size: 10px; letter-spacing: .12em; color: var(--dc-ink3);
  border: 1px solid var(--dc-line); padding: 5px 10px; white-space: nowrap;
}
.dc-metro-head {
  display: grid; grid-template-columns: 96px 1fr auto; gap: 20px; padding: 0 0 14px;
  border-bottom: 2px solid var(--dc-ink); margin-bottom: 8px;
  font-family: var(--dc-mono); font-size: 10px; letter-spacing: .22em; color: var(--dc-ink3);
}
.dc-metro-head .r { text-align: right; }
@media (max-width: 760px) {
  .dc-metro-board::before { left: 20px; }
  .dc-metro-head { display: none; }
  .dc-station { grid-template-columns: 1fr; gap: 6px; padding-left: 44px; }
  .dc-station .city { text-align: left; }
  .dc-station .node { left: 22px; }
  .dc-station .line-name { padding-left: 0; }
  .dc-station .sys { justify-self: start; }
}
/* 综合监控平台横幅 */
.dc-emcs {
  margin-top: 34px; display: flex; align-items: center; gap: 24px; flex-wrap: wrap;
  background: var(--dc-ink); color: #fff; padding: 26px 30px;
  border: 2px solid var(--dc-ink); box-shadow: 8px 8px 0 rgba(224,73,47,.25);
}
.dc-emcs .t { font-family: var(--dc-disp); font-weight: 700; font-size: 20px; }
.dc-emcs .t small { display: block; margin-top: 4px; font-family: var(--dc-mono); font-size: 10.5px; font-weight: 400; letter-spacing: .24em; color: #ff9a7a; }
.dc-emcs .chips { margin-left: auto; display: flex; flex-wrap: wrap; gap: 8px; }
.dc-emcs .chips span { font-family: var(--dc-mono); font-size: 10.5px; letter-spacing: .12em; border: 1px solid rgba(255,255,255,.35); padding: 7px 12px; color: #e8eef6; }
.dc-emcs .chips span.hl { border-color: var(--dc-l4); color: #ffb199; }

/* =====================================================
   ⑦ 平台建设 —— PDCA 环 + 软实力/硬实力双栏
   ===================================================== */
.dc-pdca-grid { display: grid; grid-template-columns: 420px 1fr; gap: 56px; align-items: center; }
.dc-pdca { position: relative; width: 100%; max-width: 400px; margin: 0 auto; }
.dc-pdca svg { width: 100%; height: auto; display: block; }
.dc-pdca .seg { cursor: default; }
.dc-pdca .seg path { transition: transform .3s ease, filter .3s ease; transform-origin: 160px 160px; }
.dc-pdca .seg:hover path { transform: scale(1.045); filter: brightness(1.08); }
.dc-pdca .seg-t { font-family: var(--dc-disp); font-weight: 700; font-size: 17px; fill: #fff; pointer-events: none; text-anchor: middle; }
.dc-pdca .seg-s { font-family: var(--dc-mono); font-size: 8.5px; letter-spacing: .14em; fill: rgba(255,255,255,.75); pointer-events: none; text-anchor: middle; }
.dc-pdca .core { fill: var(--dc-paper); stroke: var(--dc-ink); stroke-width: 2; }
.dc-pdca .core-t { font-family: var(--dc-disp); font-weight: 700; font-size: 19px; fill: var(--dc-ink); }
.dc-pdca .arrow { fill: none; stroke: var(--dc-ink); stroke-width: 2.5; stroke-linecap: round; }
.dc-pdca-steps { display: flex; flex-direction: column; gap: 0; }
.dc-pdca-step {
  display: grid; grid-template-columns: 62px 1fr; gap: 18px; padding: 18px 10px;
  border-bottom: 1px dashed var(--dc-line2); transition: background .25s ease, padding-left .25s ease;
}
.dc-pdca-step:hover { background: rgba(22,93,255,.05); padding-left: 18px; }
.dc-pdca-step:last-child { border-bottom: 0; }
.dc-pdca-step .p {
  font-family: var(--dc-disp); font-weight: 700; font-size: 30px; line-height: 1;
  color: transparent; -webkit-text-stroke: 1.6px var(--c, var(--dc-l1));
}
.dc-pdca-step h4 { font-family: var(--dc-disp); font-size: 16px; font-weight: 700; color: var(--dc-ink); }
.dc-pdca-step h4 em { font-style: normal; font-family: var(--dc-mono); font-size: 10px; letter-spacing: .2em; color: var(--dc-ink3); margin-left: 10px; }
.dc-pdca-step p { margin-top: 6px; font-size: 13px; line-height: 1.9; color: var(--dc-ink2); }
/* 软硬实力双栏 */
.dc-power { margin-top: 60px; display: grid; grid-template-columns: 1fr 1fr; gap: 22px; }
.dc-power-card { border: 1.5px solid var(--dc-line); background: #fff; transition: border-color .25s ease, box-shadow .25s ease; }
.dc-power-card:hover { box-shadow: 7px 7px 0 rgba(23,34,46,.08); }
.dc-power-card.soft { border-top: 5px solid var(--dc-l2); }
.dc-power-card.hard { border-top: 5px solid var(--dc-l4); }
.dc-power-card h3 { display: flex; align-items: center; gap: 12px; padding: 20px 24px 0; font-family: var(--dc-disp); font-size: 20px; font-weight: 700; color: var(--dc-ink); }
.dc-power-card h3 i { font-family: var(--dc-mono); font-style: normal; font-size: 10px; letter-spacing: .24em; color: #fff; padding: 4px 10px; }
.dc-power-card.soft h3 i { background: var(--dc-l2); } .dc-power-card.hard h3 i { background: var(--dc-l4); }
.dc-power-card ul { list-style: none; padding: 18px 24px 24px; display: flex; flex-direction: column; gap: 11px; }
.dc-power-card li {
  display: flex; gap: 12px; align-items: baseline; font-size: 13.5px; line-height: 1.8; color: var(--dc-ink2);
  padding-bottom: 11px; border-bottom: 1px dashed var(--dc-line);
}
.dc-power-card li:last-child { border-bottom: 0; padding-bottom: 0; }
.dc-power-card li::before { content: "▸"; color: var(--c, var(--dc-l2)); font-weight: 700; flex: none; }
.dc-power-card li b { color: var(--dc-ink); }
/* 三段式路线 */
.dc-roadline {
  margin-top: 40px; display: grid; grid-template-columns: 1fr auto 1fr auto 1fr; align-items: center;
  border: 2px solid var(--dc-ink); background: #fff; box-shadow: 6px 6px 0 rgba(23,34,46,.1);
}
.dc-roadline .ph { padding: 24px 26px; text-align: center; }
.dc-roadline .ph .n { font-family: var(--dc-mono); font-size: 10px; letter-spacing: .3em; color: var(--dc-ink3); }
.dc-roadline .ph .t { margin-top: 8px; font-family: var(--dc-disp); font-weight: 700; font-size: 18px; color: var(--dc-ink); }
.dc-roadline .arr { font-size: 22px; color: var(--dc-l1); padding: 0 6px; animation: dcNudge 1.6s ease-in-out infinite; }
.dc-roadline .arr + .arr { animation-delay: .8s; }
@keyframes dcNudge { 50% { transform: translateX(6px); } }
@media (max-width: 1024px) { .dc-pdca-grid { grid-template-columns: 1fr; } .dc-power { grid-template-columns: 1fr; } }
@media (max-width: 760px) { .dc-roadline { grid-template-columns: 1fr; } .dc-roadline .arr { transform: rotate(90deg); } }

/* =====================================================
   ⑧ 职业教育 PACT —— 四色色带
   ===================================================== */
.dc-pact { display: grid; grid-template-columns: repeat(4, 1fr); gap: 0; border: 2px solid var(--dc-ink); background: #fff; box-shadow: 8px 8px 0 rgba(23,34,46,.1); }
.dc-pact-card {
  position: relative; padding: 30px 24px 26px; border-right: 1px solid var(--dc-line);
  overflow: hidden; transition: transform .25s ease;
}
.dc-pact-card:last-child { border-right: 0; }
.dc-pact-card::before { content: ""; position: absolute; left: 0; top: 0; width: 100%; height: 6px; background: var(--c); }
.dc-pact-card:hover { transform: translateY(-5px); }
.dc-pact-card:hover .ghost { transform: translateY(-6px) scale(1.08); }
.dc-pact-card .ghost {
  position: absolute; right: 12px; bottom: -14px;
  font-family: var(--dc-disp); font-weight: 700; font-size: 84px; line-height: 1;
  color: transparent; -webkit-text-stroke: 1.6px color-mix(in srgb, var(--c) 45%, #fff);
  transition: transform .35s ease; pointer-events: none;
}
.dc-pact-card .no { font-family: var(--dc-mono); font-size: 10px; letter-spacing: .3em; color: var(--c); }
.dc-pact-card h4 { margin-top: 12px; font-family: var(--dc-disp); font-size: 21px; font-weight: 700; color: var(--dc-ink); }
.dc-pact-card h4 small { display: block; margin-top: 3px; font-family: var(--dc-mono); font-size: 10px; font-weight: 400; letter-spacing: .26em; color: var(--dc-ink3); }
.dc-pact-card p { margin-top: 14px; position: relative; font-size: 12.8px; line-height: 1.95; color: var(--dc-ink2); }
@media (max-width: 900px) { .dc-pact { grid-template-columns: 1fr 1fr; } .dc-pact-card { border-bottom: 1px solid var(--dc-line); } }
@media (max-width: 560px) { .dc-pact { grid-template-columns: 1fr; } }
.dc-pact-note {
  margin-top: 22px; display: flex; align-items: center; gap: 16px; flex-wrap: wrap;
  font-family: var(--dc-mono); font-size: 11px; letter-spacing: .16em; color: var(--dc-ink2);
  border: 1px dashed var(--dc-line2); padding: 14px 20px; background: rgba(255,255,255,.6);
}
.dc-pact-note b { color: var(--dc-l3); }

/* =====================================================
   ⑨ 飞利信建议 —— 六向能力罗盘
   ===================================================== */
.dc-prop { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.dc-prop-card {
  position: relative; background: #fff; border: 1.5px solid var(--dc-line); padding: 26px 24px 22px;
  transition: all .25s ease; overflow: hidden;
}
.dc-prop-card::after {
  content: ""; position: absolute; left: 0; bottom: 0; width: 100%; height: 4px;
  background: var(--c); transform: scaleX(0); transform-origin: left; transition: transform .35s ease;
}
.dc-prop-card:hover { border-color: var(--c); transform: translateY(-4px); box-shadow: 6px 6px 0 color-mix(in srgb, var(--c) 20%, transparent); }
.dc-prop-card:hover::after { transform: scaleX(1); }
.dc-prop-card .tag {
  display: inline-block; font-family: var(--dc-mono); font-size: 9.5px; letter-spacing: .26em;
  color: var(--c); border: 1px solid color-mix(in srgb, var(--c) 55%, #fff); padding: 4px 10px;
}
.dc-prop-card h4 { margin-top: 16px; font-family: var(--dc-disp); font-size: 18.5px; font-weight: 700; color: var(--dc-ink); }
.dc-prop-card p { margin-top: 10px; font-size: 13px; line-height: 1.9; color: var(--dc-ink2); }
@media (max-width: 900px) { .dc-prop { grid-template-columns: 1fr; } }

/* =====================================================
   ⑩ 研究院收束
   ===================================================== */
.dc-end {
  background: var(--dc-night); color: #dfe9f5;
  border-top: 2px solid var(--dc-ink);
  background-image:
    linear-gradient(rgba(122,178,255,.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(122,178,255,.06) 1px, transparent 1px);
  background-size: 28px 28px;
}
.dc-end .wrap { display: flex; align-items: center; gap: 48px; flex-wrap: wrap; }
.dc-end .stamps { display: flex; gap: 20px; }
.dc-end .dc-stamp { border-color: #ff8a6b; color: #ff8a6b; width: 104px; height: 104px; font-size: 13px; }
.dc-end .dc-stamp::after { border-color: #ff8a6b; }
.dc-end-main { flex: 1; min-width: 300px; }
.dc-end-main .k { font-family: var(--dc-mono); font-size: 11px; letter-spacing: .34em; color: #6fe0d3; }
.dc-end-main h2 { margin-top: 14px; font-family: var(--dc-disp); font-size: clamp(28px, 4vw, 44px); font-weight: 700; color: #fff; line-height: 1.3; }
.dc-end-main h2 em { font-style: normal; color: #ffb199; }
.dc-end-main p { margin-top: 18px; max-width: 62ch; font-size: 14.5px; line-height: 2; color: #a9c3e4; }
.dc-end-sign { margin-top: 26px; display: flex; align-items: center; gap: 16px; }
.dc-end-sign .name {
  font-family: var(--dc-disp); font-weight: 700; font-size: 17px; color: #fff;
  border-bottom: 2px solid #ff8a6b; padding-bottom: 4px;
}
.dc-end-sign .role { font-family: var(--dc-mono); font-size: 10.5px; letter-spacing: .2em; color: #7d95b5; }

/* ---------- 响应式收尾 ---------- */
@media (max-width: 1024px) {
  .dc-hero-grid { grid-template-columns: 1fr; gap: 40px; }
  .dc-hero { padding-top: 128px; }
}
@media (max-width: 760px) {
  .dc-sec { padding: 72px 20px; }
  .dc-hero-rail-in { grid-template-columns: 1fr 1fr; }
  .dc-hero-rail-cell { border-bottom: 1px solid var(--dc-line); }
  .dc-hero-rail-cell:nth-child(2n) { border-right: 0; }
  .dc-north { display: none; }
  .dc-apps { grid-template-columns: repeat(2, 1fr); }
}