/* ==========================================================================
   君不器官网 · UI v4「光场 / Lumen」视觉层
   --------------------------------------------------------------------------
   依据：WorkBuddy 官网（www.workbuddy.cn）真实渲染实测 + 影视飓风官网留白张力
   诊断：前三版「丑」的根因不是配色或圆角，是缺少视觉主角 —— 等大盒子平铺，
         信息均质、眼睛无落点。v3 把 WorkBuddy 的光晕稀释到 5.5% 透明度，
         只学了「浅色 + 圆角」表皮，没学「光场 + 悬浮主角窗口 + 每屏一件事」骨架。

   v4 方向（Commit to one direction）：
     1. 首屏居中字标级标题 + 一整片看得见的柔和光场 + 悬浮产品窗口（小布）
     2. 去掉所有等大卡片盒子，改开放式排版 + 超大超轻数字 + 发丝光带
     3. 超大描边章节序号作为统一视觉母题
     4. 深色只在页脚做句号；零 box-shadow；青色只做极小面积点缀
     5. 对 AI 友好：语义化、dl 事实带、@graph JSON-LD、渐进增强、禁用 JS 全可见

   分层：全局段（全站 8 页共用，克制） + .lumen-page 段（首页完整设计）
   依赖：style.css 之后引入；零第三方脚本、零后端、零外部字体。
   品牌锚点保留：六色 / 8px 间距基数 / 1180px 内容宽 / Logo 印章方正 /
                 IP 小布 48 帧动效 / 占位标注 / 渐进增强。
   ========================================================================== */

:root{
  /* ---- v4 新增 token（品牌六色保持原值，不引入第七种色相） ---- */
  --v4-glow-blue:rgba(15,76,158,.13);      /* 光场主光 */
  --v4-glow-cyan:rgba(0,212,255,.11);      /* 光场青色副光，面积极小 */
  --v4-glow-soft:rgba(15,76,158,.055);     /* 光场扩散层 */
  --v4-hairline:rgba(15,76,158,.10);       /* 发丝线 */
  --v4-hairline-2:rgba(15,76,158,.055);    /* 更淡的线 */
  --v4-surface:#F7FAFE;                    /* 极浅面，不给盒子做底 */
  --v4-r-window:28px;                      /* 主角窗口 */
  --v4-r-card:20px;
  --v4-r-pill:999px;
  --v4-sec-y:clamp(64px,6.5vw,100px);
  --v4-display:clamp(44px,5.6vw,76px);     /* 中文字标级：76px 上限避免两行折三行 */
  --v4-h2:clamp(34px,4.2vw,58px);
  --v4-metric:clamp(64px,7.4vw,104px);
  --v4-ease:cubic-bezier(.22,1,.36,1);
}

/* ==========================================================================
   A. 全局段 —— 全站 8 页共用，只改通用质感，不改内页模块结构
   ========================================================================== */
body{background:var(--paper);color:var(--ink);line-height:1.8}
a{color:var(--blue)}
a:hover{text-decoration-color:rgba(15,76,158,.35)}
h1{font-weight:500;letter-spacing:-.035em;line-height:1.16}
h2{font-weight:500;letter-spacing:-.025em;line-height:1.24}
h3{font-weight:500;letter-spacing:-.012em}
::selection{background:rgba(15,76,158,.14)}

/* 按钮：胶囊、字重放轻、零阴影；hover 只做 1px 位移 */
.btn{
  min-height:52px;padding:0 28px;border-radius:var(--v4-r-pill);
  font-size:15px;font-weight:500;border:1px solid transparent;box-shadow:none;
  transition:background .22s,color .22s,border-color .22s,transform .22s var(--v4-ease);
}
.btn:hover{transform:translateY(-2px);text-decoration:none}
.btn-primary{background:var(--blue);color:#fff}
.btn-primary:hover{background:var(--deep);border-color:var(--deep);color:#fff}
.btn-ghost{background:transparent;color:var(--blue);border-color:var(--v4-hairline)}
.btn-ghost:hover{background:var(--v4-surface);border-color:rgba(15,76,158,.2)}
.btn-sm{min-height:40px;padding:0 20px;font-size:14px}
.btn .ico,.v4-ico{width:16px;height:16px;flex:none;display:block;
  fill:none;stroke:currentColor;stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round}

/* 导航：更透气、更淡的下边线 */
.site-header{background:rgba(255,255,255,.86);border-bottom:1px solid var(--v4-hairline-2);
  backdrop-filter:saturate(170%) blur(16px)}
.nav-row{height:78px}
.nav-links a{font-size:15px}
.nav-links a:hover::after,.nav-links a[aria-current="page"]::after{
  height:2px;border-radius:var(--v4-r-pill);background:var(--blue)}
.nav-links a[aria-current="page"]{font-weight:500}
.nav-toggle{border-radius:12px;border-color:var(--v4-hairline)}

/* 页脚：深蓝作为全文唯一大面积深色（句号） */
.site-footer{background:var(--deep);color:#fff;border-top:0;padding:64px 0 28px}
.site-footer .footer-top{padding-bottom:36px}
.footer-brand img{width:172px;background:#fff;border-radius:12px;
  padding:10px 14px;box-sizing:content-box;margin-bottom:20px}
.footer-brand p{color:rgba(255,255,255,.72);max-width:48ch;font-size:14px;line-height:1.85}
.footer-nav a{color:rgba(255,255,255,.86);font-size:14px}
.footer-nav a:hover{color:#fff}
.site-footer .footer-bottom{border-top:1px solid rgba(255,255,255,.16);
  color:rgba(255,255,255,.62);padding-top:22px}
.site-footer .footer-bottom a{color:rgba(255,255,255,.8)}
.site-footer .footer-bottom .ph{color:rgba(255,255,255,.9);
  border-bottom-color:rgba(0,212,255,.7);background:rgba(0,212,255,.12)}
.to-top{border-radius:var(--v4-r-pill);border-color:var(--v4-hairline);color:var(--blue);
  transition:transform .2s var(--v4-ease)}
.to-top:hover{transform:translateY(-2px)}
.ph{border-bottom:1px dashed var(--cyan);background:rgba(0,212,255,.06);padding:0 2px;color:var(--grey)}

/* ==========================================================================
   B. 首页 · 首屏：居中字标 + 光场 + 悬浮主角窗口
   ========================================================================== */
.lumen-page .wrap{max-width:1180px;padding:0 32px}

.lumen-hero{position:relative;isolation:isolate;overflow:hidden;
  padding:clamp(48px,5vw,76px) 0 clamp(44px,4.6vw,68px);border-bottom:0}

/* 光场：三层径向渐变 + 极淡同心圆，是整站的视觉母题 */
.lumen-field{position:absolute;inset:-12% -6% -24%;z-index:-1;pointer-events:none;
  background:
    radial-gradient(ellipse 40% 46% at 68% 36%,var(--v4-glow-cyan),transparent 68%),
    radial-gradient(ellipse 56% 58% at 50% 44%,var(--v4-glow-blue),transparent 72%),
    radial-gradient(ellipse 74% 52% at 50% 98%,var(--v4-glow-soft),transparent 74%);
  animation:lumen-breathe 16s ease-in-out infinite;
}
.lumen-field::before{
  content:"";position:absolute;inset:0;
  background:repeating-radial-gradient(circle at 50% 44%,
    transparent 0 132px,rgba(15,76,158,.045) 132px 133px);
  -webkit-mask-image:radial-gradient(ellipse 54% 54% at 50% 44%,#000 0%,transparent 78%);
  mask-image:radial-gradient(ellipse 54% 54% at 50% 44%,#000 0%,transparent 78%);
}
@keyframes lumen-breathe{
  0%,100%{opacity:.88;transform:scale(1)}
  50%{opacity:1;transform:scale(1.035)}
}

.lumen-hero-inner{text-align:center;max-width:1080px;margin:0 auto}
.lumen-eyebrow{
  display:inline-flex;align-items:center;gap:9px;margin:0 0 30px;
  background:rgba(255,255,255,.72);border:1px solid var(--v4-hairline);
  color:var(--blue);border-radius:var(--v4-r-pill);padding:8px 18px;
  font-size:13px;font-weight:500;letter-spacing:.04em;
}
.lumen-eyebrow i{width:6px;height:6px;border-radius:50%;background:var(--cyan);flex:none}
.lumen-display{
  font-size:var(--v4-display);font-weight:500;line-height:1.18;
  letter-spacing:-.045em;margin:0 0 22px;
}
.lumen-display .line2{color:var(--blue);position:relative;white-space:nowrap}
.lumen-display .line2::after{
  content:"";position:absolute;left:8%;right:8%;bottom:-6px;height:2px;
  border-radius:var(--v4-r-pill);
  background:linear-gradient(90deg,transparent,rgba(0,212,255,.55),transparent);
}
.lumen-sub{
  font-size:clamp(16px,1.35vw,18px);color:var(--grey);line-height:1.95;
  max-width:60ch;margin:0 auto 28px;
}
.lumen-actions{display:flex;justify-content:center;flex-wrap:wrap;gap:14px}

/* 悬浮主角窗口：零阴影，靠身后柔光托住 */
.lumen-stage{position:relative;max-width:480px;margin:clamp(22px,2.6vw,38px) auto 0}
.lumen-stage::before{
  content:"";position:absolute;inset:-14% -18%;z-index:0;pointer-events:none;
  background:radial-gradient(ellipse at 50% 52%,rgba(15,76,158,.14),transparent 66%);
  filter:blur(28px);
}
.lumen-window{
  position:relative;z-index:1;background:rgba(255,255,255,.94);
  border:1px solid var(--v4-hairline);border-radius:var(--v4-r-window);
  overflow:hidden;
}
.lumen-window-bar{display:flex;align-items:center;gap:7px;
  padding:14px 20px;border-bottom:1px solid var(--v4-hairline-2);
  background:rgba(247,250,254,.72)}
.lumen-window-bar i{width:8px;height:8px;border-radius:50%;background:var(--line);flex:none}
.lumen-window-bar i:first-child{background:var(--cyan);opacity:.8}
.lumen-window-bar span{margin-left:auto;font:500 11px/1 var(--mono);
  letter-spacing:.12em;color:var(--grey)}
.lumen-window-body{display:grid;place-items:center;min-height:238px;
  padding:8px 20px 0;
  background:radial-gradient(ellipse 62% 58% at 50% 60%,var(--v4-glow-soft),transparent 72%)}
.lumen-window-body .ip-stage{width:216px;max-width:100%}
.lumen-caption{margin:16px 0 0;text-align:center;font-size:13px;color:var(--grey);line-height:1.7}
.lumen-caption span{display:block;font-size:12.5px;color:var(--grey)}
.lumen-badge{
  position:absolute;z-index:2;right:-14px;top:38%;
  background:#fff;border:1px solid var(--v4-hairline);border-radius:var(--v4-r-pill);
  padding:8px 15px;font:500 11px/1 var(--mono);letter-spacing:.08em;color:var(--blue);
  white-space:nowrap;
}

/* ==========================================================================
   C. AI 可读事实带 —— 机器与人读同一份文本（dl 语义，非卡片）
   ========================================================================== */
.v4-facts{padding:clamp(30px,3.2vw,46px) 0;
  border-top:1px solid var(--v4-hairline-2);border-bottom:1px solid var(--v4-hairline-2);
  background:var(--v4-surface)}
.v4-facts-grid{display:grid;grid-template-columns:210px minmax(0,1fr);gap:clamp(24px,4vw,64px);align-items:start}
.v4-facts-kicker{font:600 12px/1.7 var(--mono);letter-spacing:.14em;
  color:var(--blue);margin:6px 0 0;text-transform:uppercase}
.v4-facts-kicker small{display:block;font:400 12px/1.7 var(--sans);
  letter-spacing:0;color:var(--grey);text-transform:none;margin-top:6px}
.v4-facts-list{margin:0}
.v4-facts-list>div{display:grid;grid-template-columns:88px minmax(0,1fr);gap:24px;
  padding:13px 0;border-bottom:1px solid var(--v4-hairline-2)}
.v4-facts-list>div:first-child{padding-top:0}
.v4-facts-list>div:last-child{border-bottom:0;padding-bottom:0}
.v4-facts-list dt{font:500 12px/1.8 var(--mono);letter-spacing:.08em;color:var(--blue)}
.v4-facts-list dd{margin:0;font-size:14.5px;line-height:1.85;color:var(--ink)}

/* ==========================================================================
   D. 章节通用：超大描边序号 + 发丝光带 + 开放式排版（无卡片盒子）
   ========================================================================== */
.v4-sec{position:relative;padding:var(--v4-sec-y) 0}
.v4-sec::after{content:"";position:absolute;left:0;right:0;bottom:0;height:1px;
  background:linear-gradient(90deg,transparent,var(--v4-hairline) 18%,
    rgba(0,212,255,.28) 50%,var(--v4-hairline) 82%,transparent)}
.v4-sec:last-of-type::after{display:none}
.v4-sec-head{position:relative;margin-bottom:clamp(30px,3.8vw,50px);max-width:900px}
.v4-ghost{
  position:absolute;right:0;top:-.42em;z-index:0;pointer-events:none;user-select:none;
  font-size:clamp(88px,12vw,164px);font-weight:500;line-height:1;letter-spacing:-.08em;
  color:transparent;-webkit-text-stroke:1px rgba(15,76,158,.13);
}
.v4-kicker{position:relative;z-index:1;display:inline-flex;align-items:center;gap:10px;
  font:600 12px/1 var(--mono);letter-spacing:.14em;color:var(--blue);margin:0 0 20px}
.v4-kicker::before{content:"";width:20px;height:1px;background:var(--cyan)}
.v4-sec-head h2{position:relative;z-index:1;font-size:var(--v4-h2);font-weight:500;margin-bottom:16px}
.v4-lede{font-size:16.5px;color:var(--grey);line-height:1.9;max-width:62ch;margin:0}
.v4-foot{margin-top:36px;font-size:15px;color:var(--grey)}
.v4-foot a,.v4-inline{display:inline-flex;align-items:center;gap:8px;
  color:var(--blue);font-weight:500}
.v4-foot a .ico,.v4-inline .ico{width:15px;height:15px}
.v4-inline{margin-top:30px;font-size:15px}

/* 01 案例：超大超轻数字，开放式排版，无卡片 */
.v4-results{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));
  border-top:1px solid var(--v4-hairline-2)}
.v4-result{padding:36px 36px 8px 0;min-width:0}
.v4-result+.v4-result{padding-left:36px;border-left:1px solid var(--v4-hairline-2)}
.v4-metric{font-family:var(--sans);font-size:var(--v4-metric);font-weight:300;
  letter-spacing:-.07em;line-height:1;color:var(--blue);font-variant-numeric:tabular-nums;
  margin-bottom:20px;white-space:nowrap}
.v4-metric small{font-size:.28em;font-weight:400;letter-spacing:0;
  margin-left:6px;color:var(--grey)}
.v4-metric--word{font-size:clamp(32px,3.6vw,50px);font-weight:400;
  letter-spacing:-.045em;line-height:1.24}
.v4-result h3{font-size:20px;font-weight:500;margin-bottom:10px}
.v4-result p{font-size:15px;color:var(--grey);line-height:1.8;margin:0}
.v4-result .v4-meta{margin-top:16px;font:400 12.5px/1.7 var(--mono);
  letter-spacing:.02em;color:var(--grey)}

/* 02 场景 / 04 能力：细线胶囊，无硬边框 */
.v4-chips{display:flex;flex-wrap:wrap;gap:10px 12px}
.v4-chip{display:inline-flex;align-items:center;gap:9px;
  background:var(--v4-surface);border:1px solid transparent;
  border-radius:var(--v4-r-pill);padding:11px 20px;font-size:15px;color:var(--ink);
  transition:background .22s,border-color .22s,transform .22s var(--v4-ease)}
.v4-chip:hover{background:#fff;border-color:var(--v4-hairline);transform:translateY(-2px)}
.v4-chip i{width:6px;height:6px;border-radius:50%;background:var(--cyan);flex:none}
.v4-chip-row{margin-bottom:30px}
.v4-chip-row:last-child{margin-bottom:0}
.v4-label{display:block;font:500 12px/1.7 var(--mono);letter-spacing:.08em;
  color:var(--grey);margin-bottom:14px}

/* 03 四步：一条发丝光带时间轴 */
.v4-steps{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));
  position:relative;padding-top:38px}
.v4-steps::before{content:"";position:absolute;left:0;right:0;top:0;height:1px;
  background:linear-gradient(90deg,var(--v4-hairline),rgba(0,212,255,.38) 50%,var(--v4-hairline))}
.v4-step{position:relative;padding-right:28px;min-width:0}
.v4-step::before{content:"";position:absolute;top:-42px;left:0;
  width:9px;height:9px;border-radius:50%;background:var(--cyan)}
.v4-step::after{content:"";position:absolute;top:-48px;left:-6px;
  width:21px;height:21px;border-radius:50%;border:1px solid rgba(0,212,255,.32)}
.v4-step-n{display:block;font:500 12px/1 var(--mono);letter-spacing:.14em;
  color:var(--blue);margin-bottom:18px}
.v4-step h3{font-size:19px;font-weight:500;margin-bottom:10px}
.v4-step p{font-size:14.5px;color:var(--grey);line-height:1.85;margin:0}

/* 05 团队：超大超轻姓名，细线分栏 */
.v4-team{display:grid;grid-template-columns:minmax(0,.85fr) minmax(0,1.15fr);
  gap:clamp(40px,6vw,88px)}
.v4-team>div+div{border-left:1px solid var(--v4-hairline-2);
  padding-left:clamp(40px,5vw,72px)}
.v4-role{font:500 12px/1.7 var(--mono);letter-spacing:.1em;color:var(--blue);margin-bottom:12px}
.v4-name{font-size:clamp(44px,5vw,72px);font-weight:300;letter-spacing:-.05em;
  line-height:1.1;margin-bottom:20px}
.v4-team p{font-size:15px;color:var(--grey);line-height:1.9;margin:0}
.chips{gap:8px;margin-top:20px}
.chip{border-radius:var(--v4-r-pill);border-color:var(--v4-hairline);
  background:#fff;padding:5px 14px;font-size:12.5px;color:var(--blue)}
.ph-note{font-size:12.5px;color:var(--grey);margin-top:16px;line-height:1.75}
.v4-team .v4-ico{width:26px;height:26px;stroke:var(--cyan);margin-bottom:18px}

/* 06 转化：渐变光场圆角面板，深色只留按钮 */
.v4-cta{position:relative;overflow:hidden;border-radius:32px;
  padding:clamp(40px,5vw,72px);display:grid;
  grid-template-columns:minmax(0,1fr) 240px;gap:clamp(32px,5vw,64px);align-items:center;
  border:1px solid var(--v4-hairline-2);
  background:
    radial-gradient(ellipse 56% 78% at 88% 18%,var(--v4-glow-cyan),transparent 66%),
    linear-gradient(135deg,#F8FBFF 0%,#EAF3FD 100%)}
.v4-cta h2{font-size:clamp(30px,3.2vw,44px);font-weight:500;margin-bottom:14px;color:var(--ink)}
.v4-cta .v4-lede{margin-bottom:28px}
.v4-cta-meta{margin-top:22px;font-size:13.5px;color:var(--grey);line-height:1.85}
.v4-qr{background:#fff;border-radius:var(--v4-r-card);padding:20px;text-align:center;
  border:1px solid var(--v4-hairline-2);color:var(--ink)}
.qr-placeholder{width:100%;aspect-ratio:1;margin:0 auto 14px;
  border:1.5px dashed var(--v4-hairline);border-radius:12px;
  display:flex;align-items:center;justify-content:center;text-align:center;
  font-size:13px;color:var(--grey);background:var(--v4-surface);
  line-height:1.6;padding:14px}
.v4-qr .qr-label{font-size:14px;font-weight:500}
.v4-qr .qr-desc{font-size:12.5px;color:var(--grey);margin-top:6px;line-height:1.7}
.v4-recent{display:flex;flex-wrap:wrap;align-items:center;gap:8px 16px;
  margin-top:30px;font-size:14px;color:var(--grey)}
.v4-recent b{color:var(--ink);font-weight:500}
.v4-recent a{display:inline-flex;align-items:center;gap:5px;color:var(--blue)}
.v4-recent .ico{width:14px;height:14px;fill:none;stroke:currentColor;stroke-width:1.7;
  stroke-linecap:round;stroke-linejoin:round}
.v4-recent .sep{color:var(--v4-hairline)}

/* ==========================================================================
   E. 响应式：360 / 768 / 1280 / 1600 全部零横向溢出
   ========================================================================== */
@media(max-width:1024px){
  .v4-team{gap:40px}
  .v4-team>div+div{padding-left:36px}
  .v4-result{padding-right:26px}
  .v4-result+.v4-result{padding-left:26px}
  .v4-cta{grid-template-columns:minmax(0,1fr) 210px;gap:32px}
  .lumen-badge{right:-4px}
}
@media(max-width:860px){
  :root{--v4-sec-y:clamp(64px,8vw,88px)}
  .lumen-page .wrap{padding:0 28px}
  .lumen-display{letter-spacing:-.035em}
  .lumen-stage{max-width:460px}
  .lumen-badge{right:0;top:auto;bottom:-14px}
  .v4-facts-grid{grid-template-columns:1fr;gap:22px}
  .v4-facts-kicker{margin:0}
  .v4-facts-list>div{grid-template-columns:76px minmax(0,1fr);gap:16px}
  .v4-ghost{font-size:clamp(72px,11vw,110px);opacity:.75}
  .v4-results{grid-template-columns:repeat(2,minmax(0,1fr))}
  .v4-result:nth-child(3){grid-column:1 / -1;padding:28px 0 0;
    border-left:0;border-top:1px solid var(--v4-hairline-2);margin-top:24px}
  .v4-steps{grid-template-columns:repeat(2,minmax(0,1fr));row-gap:44px}
  .v4-step:nth-child(3)::before,.v4-step:nth-child(4)::before{display:none}
  .v4-step:nth-child(3)::after,.v4-step:nth-child(4)::after{display:none}
  .v4-team{grid-template-columns:1fr;gap:36px}
  .v4-team>div+div{border-left:0;border-top:1px solid var(--v4-hairline-2);
    padding-left:0;padding-top:36px}
  .v4-cta{grid-template-columns:1fr}
  .v4-qr{max-width:260px}
  .footer-top{grid-template-columns:1fr;gap:32px}
}
@media(max-width:600px){
  .lumen-page .wrap{padding:0 20px}
  :root{--v4-sec-y:60px;--v4-display:clamp(30px,8.2vw,42px)}
  .nav-row{height:68px}
  .lumen-hero{padding:52px 0 60px}
  .lumen-eyebrow{margin-bottom:22px;font-size:12.5px;padding:7px 15px}
  /* 移动端允许第二行内部折行，但「具体的业务场景」保持不拆 */
  .lumen-display .line2{white-space:normal}
  .lumen-display{margin-bottom:22px;line-height:1.26}
  .lumen-display .line2::after{left:2%;right:2%;bottom:-3px}
  .lumen-sub{font-size:15.5px;margin-bottom:28px}
  .lumen-actions .btn{width:100%}
  .lumen-stage{margin-top:44px}
  .lumen-window-body{min-height:250px}
  .lumen-window-body .ip-stage{width:190px}
  .lumen-badge{font-size:10px;padding:7px 12px;bottom:-12px}
  .v4-facts-list>div{grid-template-columns:1fr;gap:4px;padding:12px 0}
  .v4-facts-list dt{font-size:11.5px}
  .v4-facts-list dd{font-size:14px}
  .v4-ghost{font-size:66px;top:-.2em;right:-4px;opacity:.6}
  .v4-sec-head{margin-bottom:32px}
  .v4-results{grid-template-columns:1fr}
  .v4-result,.v4-result+.v4-result{padding:26px 0 0;border-left:0;
    border-top:1px solid var(--v4-hairline-2);margin-top:24px;padding-left:0}
  .v4-result:first-child{border-top:0;margin-top:0;padding-top:8px}
  .v4-result:nth-child(3){margin-top:24px}
  .v4-metric{font-size:clamp(58px,16vw,80px)}
  .v4-metric--word{font-size:clamp(30px,8vw,40px)}
  .v4-steps{grid-template-columns:1fr;row-gap:0;padding-top:30px}
  .v4-steps::before{top:0;bottom:0;left:4px;right:auto;width:1px;height:auto;
    background:linear-gradient(180deg,var(--v4-hairline),rgba(0,212,255,.38),var(--v4-hairline))}
  .v4-step{padding:0 0 28px 28px}
  .v4-step::before,.v4-step::after{display:none}
  .v4-step::after{display:block;content:"";position:absolute;top:6px;left:0;
    width:9px;height:9px;border:0;background:var(--cyan);border-radius:50%}
  .v4-step:last-child{padding-bottom:0}
  .v4-chip{font-size:13.5px;padding:10px 16px}
  .v4-name{font-size:clamp(40px,12vw,56px)}
  .v4-cta{padding:28px 22px;border-radius:24px}
  .v4-cta h2{font-size:28px}
  .footer-bottom{flex-direction:column}
  .to-top{right:16px;bottom:16px}
}

/* 尊重减少动效偏好：关闭光场呼吸、hover 位移、淡入 */
@media(prefers-reduced-motion:reduce){
  .lumen-field{animation:none}
  .btn:hover,.v4-chip:hover,.to-top:hover{transform:none}
  .js-reveal .reveal,.reveal{opacity:1;transform:none}
}