/* ============================================================
   滑模工艺剖面滚动演示 · slipform-scroll.css
   A 方案 · 与 main.css 并存，类名统一 sf- 前缀
   动效只用 transform / opacity；无外部依赖、无 CDN 字体
   ------------------------------------------------------------
   结构：.sf-sec > .sf-pin > .sf-wrap > .sf-head + .sf-body
         .sf-body > .sf-fig + .sf-panel(.sf-steps + .sf-meter)
   滚动进度由 CSS 变量 --sf-w（世界下沉）/ --sf-h（累计浇筑）
   驱动，全部视觉变化都是 transform / opacity 的派生。
   ============================================================ */

/* ---------- 0. 局部重置（不依赖 main.css） ---------- */
.sf-sec,
.sf-sec *,
.sf-sec *::before,
.sf-sec *::after{box-sizing:border-box}

.sf-sec,
.sf-sec h2,
.sf-sec h3,
.sf-sec p,
.sf-sec ol,
.sf-sec li,
.sf-sec dl,
.sf-sec dt,
.sf-sec dd,
.sf-sec figure{margin:0;padding:0}

.sf-sec ol{list-style:none}

/* ---------- 1. 区块外壳 / 设计变量 ---------- */
.sf-sec{
  --sf-navy:#0b2138;
  --sf-navy-2:#0e2b4a;
  --sf-blue:#019fe9;
  --sf-cyan:#5ec8ff;
  --sf-ice:#e8f4ff;
  --sf-text:#c3d8ea;
  --sf-muted:#8aa8c4;
  --sf-line:rgba(94,200,255,.18);
  --sf-mono:ui-monospace,SFMono-Regular,Menlo,Consolas,"Liberation Mono","Courier New",monospace;
  --sf-ease:cubic-bezier(.22,.61,.36,1);
  --sf-top:0px;                 /* 站点吸顶导航高度，集成时按需覆盖 */
  --sf-fig-h:min(68vh,620px);   /* 剖面图最大高度 */
  --sf-w:396;                   /* 世界下沉（用户单位） */
  --sf-h:496;                   /* 累计浇筑（用户单位） */

  position:relative;
  isolation:isolate;
  height:auto;
  color:var(--sf-text);
  font-family:"Microsoft YaHei","PingFang SC","Noto Sans SC",system-ui,sans-serif;
  font-size:15px;
  line-height:1.6;
  overflow-wrap:break-word;
  background:
    radial-gradient(1100px 560px at 74% 6%,rgba(1,159,233,.16),transparent 64%),
    radial-gradient(820px 520px at 6% 94%,rgba(1,159,233,.10),transparent 62%),
    repeating-linear-gradient(90deg,rgba(94,200,255,.055) 0 1px,transparent 1px 44px),
    repeating-linear-gradient(0deg,rgba(94,200,255,.045) 0 1px,transparent 1px 44px),
    var(--sf-navy);
}

/* 吸顶导航高度（与 main.css 的 .site-header 对齐；demo 页会覆盖） */
@media(min-width:768px){.sf-sec{--sf-top:60px}}
@media(min-width:1200px){.sf-sec{--sf-top:84px}}

/* 滚动跑道：JS 启动后才启用，避免无 JS 时出现 340vh 空白 */
.sf-sec.sf-js{height:340vh}

.sf-pin{position:relative}

.sf-sec.sf-js .sf-pin{
  position:sticky;
  top:var(--sf-top);
  height:calc(100vh - var(--sf-top));
  height:calc(100dvh - var(--sf-top));
  display:flex;
  align-items:center;
  overflow:hidden;
}

.sf-wrap{
  width:100%;
  max-width:1220px;
  margin:0 auto;
  padding:0 24px;
}

/* ---------- 2. 区块标题 ---------- */
.sf-head{display:grid;gap:8px;padding-bottom:clamp(10px,2vh,24px)}

.sf-kicker{
  display:inline-flex;align-items:center;gap:10px;
  font-family:var(--sf-mono);font-size:10px;letter-spacing:.32em;
  text-transform:uppercase;color:var(--sf-cyan);
}
.sf-kicker::before{content:"";width:26px;height:1px;background:currentColor;opacity:.85}

.sf-title{
  font-size:clamp(22px,2.5vw,33px);line-height:1.28;
  letter-spacing:.02em;font-weight:800;color:#fff;
}
.sf-title em{font-style:normal;color:var(--sf-cyan)}

.sf-intro{
  font-size:13px;line-height:1.8;color:var(--sf-muted);
  max-width:54ch;
}

@media(min-width:900px){
  .sf-head{grid-template-columns:minmax(0,1.05fr) minmax(0,.95fr);align-items:end;gap:6px 44px}
  .sf-kicker{grid-column:1 / -1}
  .sf-title{grid-column:1;grid-row:2}
  .sf-intro{grid-column:2;grid-row:2;align-self:end}
}

/* ---------- 3. 图面 + 侧栏 ---------- */
.sf-body{display:grid;grid-template-columns:minmax(0,1fr);gap:24px;align-items:center}
@media(min-width:900px){
  .sf-body{grid-template-columns:minmax(0,.95fr) minmax(0,1.05fr);gap:clamp(24px,3.4vw,56px)}
}

.sf-fig{
  position:relative;
  width:100%;
  max-width:calc(var(--sf-fig-h) * .8372);
  aspect-ratio:720 / 860;
  margin:0 auto;
  border:1px solid var(--sf-line);
  background:#081a2c;
}
.sf-fig::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:radial-gradient(120% 88% at 50% 0%,rgba(1,159,233,.10),transparent 62%);
}

.sf-svg{display:block;width:100%;height:100%}

/* 图框角标 */
.sf-tick{
  position:absolute;width:14px;height:14px;z-index:2;pointer-events:none;
  border:0 solid rgba(94,200,255,.55);
}
.sf-tick--tl{left:-1px;top:-1px;border-left-width:2px;border-top-width:2px}
.sf-tick--tr{right:-1px;top:-1px;border-right-width:2px;border-top-width:2px}
.sf-tick--bl{left:-1px;bottom:-1px;border-left-width:2px;border-bottom-width:2px}
.sf-tick--br{right:-1px;bottom:-1px;border-right-width:2px;border-bottom-width:2px}

/* 图签（真实 HTML 文本，可被爬虫读取） */
.sf-titleblock{
  position:absolute;left:12px;top:10px;z-index:2;
  padding-left:9px;border-left:2px solid rgba(94,200,255,.55);
  font-family:var(--sf-mono);font-size:8.5px;line-height:1.6;
  letter-spacing:.12em;text-transform:uppercase;
  color:rgba(168,202,229,.72);pointer-events:none;
}
.sf-titleblock b{
  display:block;font-size:9.5px;letter-spacing:.16em;
  color:rgba(232,244,255,.92);font-weight:600;
}

/* ---------- 4. SVG 剖面：阶段显隐 + 滚动派生 ---------- */
/* 世界（混凝土 / 钢筋 / 爬杆 / 基座）随顶升整体下沉 */
.sf-world{transform:translateY(calc(var(--sf-w,396) * 1px))}

/* 混凝土分层：出模才出现（--sf-w 越过本层即淡入） */
.sf-layer{opacity:clamp(0,calc((var(--sf-w,396) - var(--i) * 22) * .0455),1)}

.sf-part{transition:opacity .45s var(--sf-ease)}

/* 默认（JS 未介入时）：最终成型态 */
.sf-part[data-p="form"],
.sf-part[data-p="rig"],
.sf-part[data-p="wet"],
.sf-part[data-p="base"]{opacity:1}
.sf-part[data-p="rebar"]{opacity:.35}
.sf-part[data-p="rods"]{opacity:0}
.sf-part[data-p="ghost"],
.sf-part[data-p="bucket"],
.sf-part[data-p="jackglow"]{opacity:0}

/* 阶段 1 · 基底与钢筋笼：模板/平台淡显待装 */
[data-stage="1"] .sf-part[data-p="form"]{opacity:.2}
[data-stage="1"] .sf-part[data-p="rig"]{opacity:.2}
[data-stage="1"] .sf-part[data-p="wet"]{opacity:0}
[data-stage="1"] .sf-part[data-p="rebar"]{opacity:1}
[data-stage="1"] .sf-part[data-p="ghost"]{opacity:1}

/* 阶段 2 · 合模 */
[data-stage="2"] .sf-part[data-p="rebar"]{opacity:.5}
[data-stage="2"] .sf-part[data-p="rods"]{opacity:.6}

/* 阶段 3–5 · 顶升 / 浇筑 / 成型 */
[data-stage="3"] .sf-part[data-p="rebar"],
[data-stage="4"] .sf-part[data-p="rebar"],
[data-stage="5"] .sf-part[data-p="rebar"]{opacity:0}
[data-stage="3"] .sf-part[data-p="rods"],
[data-stage="4"] .sf-part[data-p="rods"],
[data-stage="5"] .sf-part[data-p="rods"]{opacity:1}
[data-stage="3"] .sf-part[data-p="jackglow"]{opacity:1}
[data-stage="4"] .sf-part[data-p="bucket"]{opacity:1}

/* 引线：随阶段显隐 */
.sf-lead{opacity:0;transition:opacity .34s var(--sf-ease)}
.sf-sec[data-stage="1"] .sf-lead[data-s="1"],
.sf-sec[data-stage="2"] .sf-lead[data-s="2"],
.sf-sec[data-stage="3"] .sf-lead[data-s="3"],
.sf-sec[data-stage="4"] .sf-lead[data-s="4"],
.sf-sec[data-stage="5"] .sf-lead[data-s="5"]{opacity:1}

/* ---------- 5. 图纸标注（HTML 文本 + SVG 引线） ---------- */
.sf-annos{position:absolute;inset:0;z-index:3;pointer-events:none}

.sf-anno{
  --sf-dx:6px;
  position:absolute;
  left:var(--x,50%);top:var(--y,50%);
  max-width:46%;
  padding:5px 8px 6px;
  border:1px solid rgba(94,200,255,.20);
  border-left:2px solid rgba(94,200,255,.85);
  background:rgba(7,23,41,.84);
  opacity:0;
  transform:translate(var(--sf-dx),calc(-50% + 4px));
  transition:opacity .32s var(--sf-ease),transform .32s var(--sf-ease);
}
.sf-anno--l{
  --sf-dx:calc(-100% - 6px);
  text-align:right;
  border-left:0;
  border-right:2px solid rgba(94,200,255,.85);
}
.sf-anno.is-on{opacity:1;transform:translate(var(--sf-dx),-50%)}

.sf-anno b{
  display:block;font-size:11px;line-height:1.45;font-weight:700;
  color:#eaf6ff;white-space:nowrap;letter-spacing:.02em;
}
.sf-anno i{
  display:block;font-style:normal;font-size:9.5px;line-height:1.5;
  color:var(--sf-muted);white-space:nowrap;
}
.sf-num{font-family:var(--sf-mono);font-size:10px;color:var(--sf-cyan);letter-spacing:.02em;margin-left:2px}

/* FIG 编号标签（工程图纸标签样式） */
.sf-tab{
  position:absolute;left:-1px;top:-12px;
  padding:0 4px;
  font-family:var(--sf-mono);font-size:7.5px;line-height:12px;letter-spacing:.06em;
  color:var(--sf-cyan);background:#0b2138;
  border:1px solid rgba(94,200,255,.20);border-bottom:0;
}
.sf-anno--l .sf-tab{left:auto;right:-1px}

/* ---------- 6. 工序清单 ---------- */
.sf-panel{min-width:0}

.sf-steps{display:grid;gap:0}

.sf-step{
  position:relative;
  display:grid;
  grid-template-columns:60px minmax(0,1fr);
  column-gap:10px;
  padding:9px 12px 9px 16px;
  border-left:1px solid rgba(94,200,255,.22);
  opacity:.6;
  transition:opacity .3s var(--sf-ease);
}
.sf-step+.sf-step{margin-top:2px}
.sf-step.is-on{
  opacity:1;
  border-left-color:var(--sf-cyan);
  background:linear-gradient(90deg,rgba(1,159,233,.13),rgba(1,159,233,0) 72%);
}

.sf-step-f{
  grid-column:1;grid-row:1 / span 2;
  padding-top:4px;
  font-family:var(--sf-mono);font-size:10px;letter-spacing:.06em;
  color:var(--sf-cyan);
}
.sf-step h3{
  grid-column:2;grid-row:1;
  font-size:14px;line-height:1.4;font-weight:700;
  letter-spacing:.02em;color:#eaf6ff;
}
.sf-step p{
  grid-column:2;grid-row:2;
  font-size:11.5px;line-height:1.6;color:var(--sf-muted);
}
.sf-step dl{
  grid-column:2;grid-row:3;
  display:flex;flex-wrap:wrap;gap:4px 6px;
  margin-top:6px;
}
.sf-step dl>div{
  display:flex;align-items:baseline;gap:5px;
  padding:2px 6px;border:1px solid rgba(94,200,255,.16);border-radius:2px;
  font-size:9.5px;line-height:1.5;color:#a9c6e0;
}
.sf-step dt{color:var(--sf-muted)}
.sf-step dd{font-family:var(--sf-mono);font-size:9.5px;color:var(--sf-cyan)}

/* ---------- 7. 进度 / 读数 ---------- */
.sf-meter{
  display:grid;grid-template-columns:auto minmax(0,1fr);
  align-items:center;gap:8px 16px;
  margin-top:clamp(10px,1.8vh,20px);
  padding-top:clamp(10px,1.4vh,16px);
  border-top:1px solid rgba(94,200,255,.16);
}
.sf-meter-now{
  display:flex;flex-direction:column;gap:1px;
  font-family:var(--sf-mono);font-size:9px;letter-spacing:.14em;color:var(--sf-muted);
}
.sf-meter-now b{font-size:12px;letter-spacing:.08em;color:var(--sf-cyan);font-weight:600}
.sf-bar{position:relative;height:2px;background:rgba(94,200,255,.16);overflow:hidden}
.sf-bar i{
  display:block;width:100%;height:100%;
  background:linear-gradient(90deg,var(--sf-blue),var(--sf-cyan));
  transform:scaleX(1);transform-origin:0 50%;
}
.sf-readout{
  grid-column:1 / -1;
  display:flex;flex-wrap:wrap;gap:6px 20px;
  font-family:var(--sf-mono);font-size:9.5px;letter-spacing:.06em;color:var(--sf-muted);
}
.sf-readout b{color:var(--sf-cyan);font-weight:600}
.sf-hint{margin-left:auto;font-family:"Microsoft YaHei","PingFang SC",system-ui,sans-serif;letter-spacing:.1em;color:rgba(138,168,196,.8)}

/* 桌面端不渲染图卡副本（仅移动端启用） */
@media(min-width:900px){
  .sf-card-art,.sf-card-meta{display:none}
}

/* ---------- 8. 移动端：取消 sticky，5 张静态图卡 ---------- */
@media(max-width:899px){
  .sf-sec.sf-js{height:auto}
  .sf-sec.sf-js .sf-pin{
    position:static;height:auto;overflow:visible;
    padding:52px 0 44px;
    display:block;
  }
  .sf-wrap{padding:0 16px}
  .sf-head{padding-bottom:22px;grid-template-columns:1fr}
  .sf-body{display:block}
  .sf-fig{display:none}
  .sf-annos,.sf-titleblock,.sf-tick{display:none}

  .sf-steps{display:block}
  .sf-step{
    display:block;
    margin:0;padding:0 0 16px;
    opacity:1;
    border:1px solid rgba(94,200,255,.16);
    border-left:2px solid rgba(94,200,255,.62);
    background:rgba(13,40,66,.55);
    border-radius:2px;
    overflow:hidden;
  }
  .sf-step+.sf-step{margin-top:18px}
  .sf-step.is-on{background:rgba(13,40,66,.55)}

  .sf-card-art{display:block;background:#081a2c;border-bottom:1px solid rgba(94,200,255,.14)}
  .sf-card-art svg{display:block;width:100%;height:auto}
  .sf-step-f{
    display:inline-block;
    margin:12px 14px 0;padding:2px 6px;
    border:1px solid rgba(94,200,255,.30);
    font-size:9.5px;
  }
  .sf-step h3{margin:8px 14px 0;font-size:15px}
  .sf-step p{margin:6px 14px 0;font-size:12px}
  .sf-step dl{margin:10px 14px 0}
  .sf-step dl>div{font-size:10px}
  .sf-card-meta{
    margin:10px 14px 0;
    font-size:10.5px;color:var(--sf-muted);
  }
  .sf-card-meta b{font-family:var(--sf-mono);color:var(--sf-cyan);font-weight:600}
  .sf-meter{display:none}
}

/* 桌面端不渲染卡片副本 */
/* ---------- 9. 偏矮视口微调 ---------- */
@media(min-width:900px) and (max-height:820px){
  .sf-sec{--sf-fig-h:min(62vh,500px)}
  .sf-step{padding:7px 12px 7px 14px}
  .sf-step p{font-size:11px}
}
@media(min-width:900px) and (max-height:700px){
  .sf-sec{--sf-fig-h:min(50vh,420px)}
  .sf-intro{font-size:12px;line-height:1.65}
}

/* ---------- 10. prefers-reduced-motion：直接给最终态 ---------- */
@media(prefers-reduced-motion:reduce){
  .sf-sec.sf-js{height:auto}
  .sf-sec.sf-js .sf-pin{
    position:static;height:auto;overflow:visible;
    padding:64px 0 56px;display:block;
  }
  .sf-part,.sf-anno,.sf-lead,.sf-step,.sf-bar i{transition:none !important}
  .sf-sec.sf-rm .sf-anno{opacity:1;transform:translate(var(--sf-dx),-50%)}
  .sf-sec.sf-rm .sf-anno[data-s="1"]{opacity:0}
  .sf-sec.sf-rm .sf-lead[data-s="2"],
  .sf-sec.sf-rm .sf-lead[data-s="3"],
  .sf-sec.sf-rm .sf-lead[data-s="4"],
  .sf-sec.sf-rm .sf-lead[data-s="5"]{opacity:1}
  .sf-sec.sf-rm .sf-step{opacity:1}
}