/* =========================================================
   湖北极时通网络技术有限公司 · 官网样式
   Dark / Space / Precision
   ========================================================= */

:root{
  --bg:        #0a0f1e;
  --bg-2:      #0d1326;
  --bg-3:      #0b1020;
  --panel:     rgba(255,255,255,.05);
  --panel-hi:  rgba(255,255,255,.09);
  --line:      rgba(255,255,255,.13);
  --line-soft: rgba(255,255,255,.075);

  --text:      #f7f3f5;
  --muted:     #aca7b2;
  --dim:       #837e8b;

  /* 强调色体系：以标识的品牌红为唯一主色，暖橙只做渐变的起点，不再有冷暖对立 */
  --red:       #e2314b;   /* 品牌红 #E2314B，与标识完全一致 */
  --red-hi:    #ff5a6e;   /* 暗底提亮版，用于正文级强调与描边 */
  --warm:      #ff8a66;   /* 暖橙，只出现在渐变起点与光晕里 */
  --grad:      linear-gradient(100deg,#ff8a66 0%,#e2314b 52%,#ff3355 100%);

  --radius:    18px;
  --ease:      cubic-bezier(.22,1,.36,1);
}

*{ margin:0; padding:0; box-sizing:border-box; }

html{
  scroll-behavior:smooth;
  -webkit-text-size-adjust:100%;
}

body{
  background:
    radial-gradient(ellipse 80% 55% at 50% -8%, rgba(226,49,75,.20), transparent 62%),
    radial-gradient(ellipse 55% 40% at 92% 18%, rgba(255,138,102,.16), transparent 62%),
    radial-gradient(ellipse 60% 45% at 4% 62%, rgba(255,90,110,.11), transparent 62%),
    var(--bg);
  background-attachment:fixed;
  color:var(--text);
  font-family:"HarmonyOS Sans SC","PingFang SC","Microsoft YaHei","Inter",system-ui,-apple-system,"Segoe UI",sans-serif;
  font-size:16px;
  line-height:1.7;
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
}

::selection{ background:rgba(255,90,110,.28); color:#fff; }

a{ color:inherit; text-decoration:none; }
ul{ list-style:none; }
img,svg{ display:block; }

/* 滚动条 */
::-webkit-scrollbar{ width:10px; }
::-webkit-scrollbar-track{ background:#0a0f1e; }
::-webkit-scrollbar-thumb{
  background:linear-gradient(#2a2434,#3d3040);
  border-radius:10px;
  border:2px solid #0a0f1e;
}
::-webkit-scrollbar-thumb:hover{ background:linear-gradient(#ff5a6e,#e2314b); }

/* ================= 顶部进度条 ================= */
.progress{
  position:fixed; top:0; left:0; right:0; height:2px;
  z-index:200; background:transparent;
}
.progress span{
  display:block; height:100%; width:0;
  background:var(--grad);
  box-shadow:0 0 12px rgba(255,90,110,.8);
  transition:width .08s linear;
}

/* ================= 导航 ================= */
.nav{
  position:fixed; top:0; left:0; right:0; z-index:150;
  transition:background .4s var(--ease), backdrop-filter .4s var(--ease), border-color .4s;
  border-bottom:1px solid transparent;
}
.nav.scrolled{
  background:rgba(10,17,32,.82);
  backdrop-filter:blur(18px) saturate(160%);
  -webkit-backdrop-filter:blur(18px) saturate(160%);
  border-bottom-color:var(--line-soft);
}
.nav-inner{
  max-width:1280px; margin:0 auto;
  padding:0 28px; height:74px;
  display:flex; align-items:center; justify-content:space-between;
  gap:24px;
}

.brand{ display:flex; align-items:center; gap:11px; }
.brand-logo{ height:36px; width:auto; display:block; }

.brand-mark{
  width:36px; height:36px; flex:0 0 36px;
  display:grid; place-items:center;
  border-radius:10px;
  background:rgba(255,255,255,.04);
  border:1px solid var(--line);
  box-shadow:inset 0 1px 0 rgba(255,255,255,.08);
}
.brand-mark svg{ width:20px; height:20px; }
.brand-mark.small{ width:32px; height:32px; flex-basis:32px; }
.brand-mark.small svg{ width:17px; height:17px; }

.brand-text{ display:flex; flex-direction:column; line-height:1.25; }
.brand-text strong{ font-size:15.5px; font-weight:700; letter-spacing:.02em; }
.brand-text em{
  font-size:9.5px; font-style:normal; letter-spacing:.22em;
  color:var(--dim); font-family:ui-monospace,"SFMono-Regular",Consolas,monospace;
}

.nav-links{ display:flex; align-items:center; gap:6px; }
.nav-links a{
  position:relative;
  padding:9px 15px; border-radius:9px;
  font-size:14px; color:var(--muted);
  transition:color .25s, background .25s;
}
.nav-links a:hover{ color:var(--text); background:rgba(255,255,255,.072); }
.nav-links a.nav-cta{
  color:var(--text);
  border:1px solid rgba(255,90,110,.35);
  background:linear-gradient(180deg,rgba(255,90,110,.14),rgba(255,138,102,.10));
  margin-left:8px;
  font-weight:600;
}
.nav-links a.nav-cta:hover{
  border-color:rgba(255,90,110,.7);
  box-shadow:0 0 22px rgba(255,90,110,.25);
}

.nav-toggle{
  display:none;
  width:42px; height:42px;
  background:transparent; border:1px solid var(--line);
  border-radius:10px; cursor:pointer;
  flex-direction:column; align-items:center; justify-content:center; gap:5px;
}
.nav-toggle span{
  display:block; width:17px; height:1.5px; background:var(--text);
  transition:transform .3s var(--ease), opacity .25s;
}
.nav-toggle.open span:nth-child(1){ transform:translateY(6.5px) rotate(45deg); }
.nav-toggle.open span:nth-child(2){ opacity:0; }
.nav-toggle.open span:nth-child(3){ transform:translateY(-6.5px) rotate(-45deg); }

/* ================= 首屏 ================= */
.hero{
  position:relative;
  min-height:100vh;
  min-height:100svh;
  display:flex; align-items:center; justify-content:center;
  padding:120px 28px 96px;
  overflow:hidden;
  isolation:isolate;
}

#net{
  position:absolute; inset:0;
  width:100%; height:100%;
  opacity:.55; z-index:0;
  -webkit-mask-image:radial-gradient(ellipse 78% 68% at 50% 42%, #000 30%, transparent 100%);
  mask-image:radial-gradient(ellipse 78% 68% at 50% 42%, #000 30%, transparent 100%);
}

/* 地平线发光 */
.hero::after{
  content:"";
  position:absolute; left:-5%; right:-5%; bottom:14%;
  height:1px; z-index:1; pointer-events:none;
  background:linear-gradient(90deg,
    transparent 0%,
    rgba(255,90,110,.55) 22%,
    rgba(255,138,102,.8) 50%,
    rgba(255,90,110,.55) 78%,
    transparent 100%);
  box-shadow:0 0 30px 3px rgba(226,49,75,.45);
  opacity:.75;
  animation:horizon 7s ease-in-out infinite;
}
@keyframes horizon{
  0%,100%{ opacity:.55; }
  50%    { opacity:.95; }
}

.hero-glow{
  position:absolute; border-radius:50%;
  filter:blur(90px); pointer-events:none; z-index:0;
}
.g1{
  width:min(760px,85vw); height:min(760px,85vw);
  top:-22%; left:50%; transform:translateX(-50%);
  background:radial-gradient(circle,rgba(226,49,75,.34),transparent 68%);
  animation:breathe 14s ease-in-out infinite;
}
.g2{
  width:min(520px,60vw); height:min(520px,60vw);
  top:26%; left:-6%;
  background:radial-gradient(circle,rgba(255,90,110,.30),transparent 70%);
  animation:breathe 18s ease-in-out infinite reverse;
}
.g3{
  width:min(560px,64vw); height:min(560px,64vw);
  bottom:-18%; right:-10%;
  background:radial-gradient(circle,rgba(255,138,102,.27),transparent 70%);
  animation:breathe 16s ease-in-out infinite;
}
@keyframes breathe{
  0%,100%{ opacity:.75; transform:translateX(var(--tx,0)) scale(1); }
  50%    { opacity:1;   transform:translateX(var(--tx,0)) scale(1.12); }
}
.g1{ --tx:-50%; }

/* 透视网格地面（仅作地平线，避开正文区域） */
.grid-floor{
  position:absolute; left:-30%; right:-30%; bottom:-1%;
  height:26%; z-index:0; pointer-events:none;
  background-image:
    linear-gradient(rgba(255,90,110,.85) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,90,110,.62) 1px, transparent 1px);
  background-size:74px 74px;
  transform:perspective(500px) rotateX(52deg);
  transform-origin:bottom center;
  -webkit-mask-image:linear-gradient(to top, rgba(0,0,0,.95) 0%, rgba(0,0,0,.45) 58%, transparent 100%);
  mask-image:linear-gradient(to top, rgba(0,0,0,.95) 0%, rgba(0,0,0,.45) 58%, transparent 100%);
  animation:floorFlow 9s linear infinite;
  opacity:.85;
}
@keyframes floorFlow{
  from{ background-position:0 0, 0 0; }
  to  { background-position:0 74px, 0 0; }
}

.hero-inner{
  position:relative; z-index:2;
  max-width:1000px; width:100%;
  text-align:center;
}

.eyebrow{
  display:inline-flex; align-items:center; gap:9px;
  padding:7px 15px 7px 12px;
  border-radius:999px;
  border:1px solid var(--line);
  background:rgba(255,255,255,.058);
  backdrop-filter:blur(8px);
  font-size:12.5px; letter-spacing:.04em; color:var(--muted);
  font-family:ui-monospace,"SFMono-Regular",Consolas,monospace;
  margin-bottom:32px;
}
.eyebrow .dot{
  width:6px; height:6px; border-radius:50%;
  background:var(--red-hi);
  box-shadow:0 0 0 0 rgba(255,90,110,.7);
  animation:pulse 2.4s infinite;
}
@keyframes pulse{
  0%  { box-shadow:0 0 0 0 rgba(255,90,110,.6); }
  70% { box-shadow:0 0 0 9px rgba(255,90,110,0); }
  100%{ box-shadow:0 0 0 0 rgba(255,90,110,0); }
}

.hero-title{
  font-size:clamp(34px,6.1vw,74px);
  line-height:1.14;
  font-weight:800;
  letter-spacing:-.025em;
  margin-bottom:28px;
}
.hero-title .grad{
  background:var(--grad);
  -webkit-background-clip:text; background-clip:text;
  -webkit-text-fill-color:transparent; color:transparent;
  position:relative;
  filter:drop-shadow(0 0 34px rgba(226,49,75,.35));
}

.hero-sub{
  max-width:700px; margin:0 auto 44px;
  font-size:clamp(14.5px,1.35vw,17px);
  line-height:1.95;
  color:#a8a4ae;
}

.hero-actions{
  display:flex; gap:14px; justify-content:center;
  flex-wrap:wrap; margin-bottom:64px;
}

/* 按钮 */
.btn{
  display:inline-flex; align-items:center; gap:9px;
  padding:13px 26px; border-radius:11px;
  font-size:14.5px; font-weight:600;
  letter-spacing:.01em;
  cursor:pointer; border:1px solid transparent;
  transition:transform .3s var(--ease), box-shadow .35s, background .3s, border-color .3s;
  white-space:nowrap;
}
.btn svg{
  width:16px; height:16px; fill:none;
  stroke:currentColor; stroke-width:2;
  stroke-linecap:round; stroke-linejoin:round;
  transition:transform .3s var(--ease);
}
.btn:hover svg{ transform:translateX(3px); }

.btn-primary{
  color:#fff;
  background:linear-gradient(100deg,#ff6d5c 0%,#e2314b 58%,#d21f3e 100%);
  box-shadow:0 8px 30px -8px rgba(226,49,75,.72), inset 0 1px 0 rgba(255,255,255,.30);
}
.btn-primary:hover{
  transform:translateY(-2px);
  box-shadow:0 14px 40px -8px rgba(255,90,110,.7), inset 0 1px 0 rgba(255,255,255,.55);
}
.btn-ghost{
  color:var(--text);
  border-color:var(--line);
  background:rgba(255,255,255,.058);
  backdrop-filter:blur(8px);
}
.btn-ghost:hover{
  transform:translateY(-2px);
  border-color:rgba(255,90,110,.5);
  background:rgba(255,90,110,.07);
}
.btn-lg{ padding:15px 32px; font-size:15px; }

/* 首屏指标 */
.hero-metrics{
  display:grid; grid-template-columns:repeat(4,1fr);
  max-width:760px; margin:0 auto;
  border-top:1px solid var(--line-soft);
  padding-top:34px;
}
.metric{ text-align:center; position:relative; }
.metric + .metric::before{
  content:""; position:absolute; left:0; top:6px; bottom:6px;
  width:1px; background:linear-gradient(transparent,var(--line),transparent);
}
.metric b{
  display:block;
  font-size:clamp(17px,1.95vw,22px);
  font-weight:700;
  line-height:1.25;
  letter-spacing:.035em;
  background:linear-gradient(180deg,#ffffff,#e6dade);
  -webkit-background-clip:text; background-clip:text;
  -webkit-text-fill-color:transparent;
  filter:drop-shadow(0 0 18px rgba(255,140,150,.28));
}
.metric span{
  display:block; margin-top:7px;
  font-size:11.5px; color:var(--dim);
  line-height:1.55;
  letter-spacing:.02em;
}

.scroll-hint{
  position:absolute; bottom:30px; left:50%; transform:translateX(-50%);
  width:24px; height:38px; border-radius:14px;
  border:1px solid var(--line);
  z-index:3;
  display:grid; place-items:start center; padding-top:7px;
}
.scroll-hint span{
  width:3px; height:8px; border-radius:2px;
  background:var(--red-hi);
  animation:scrollDot 1.9s var(--ease) infinite;
}
@keyframes scrollDot{
  0%  { transform:translateY(0);   opacity:1; }
  70% { transform:translateY(13px); opacity:0; }
  100%{ transform:translateY(13px); opacity:0; }
}

/* ================= 跑马灯 ================= */
.marquee{
  position:relative;
  border-top:1px solid var(--line-soft);
  border-bottom:1px solid var(--line-soft);
  background:linear-gradient(90deg,rgba(255,90,110,.045),rgba(255,138,102,.045));
  overflow:hidden;
  padding:15px 0;
  -webkit-mask-image:linear-gradient(90deg,transparent,#000 12%,#000 88%,transparent);
  mask-image:linear-gradient(90deg,transparent,#000 12%,#000 88%,transparent);
}
.marquee-track{
  display:flex; align-items:center; gap:0;
  width:max-content;
  animation:marquee 42s linear infinite;
}
.marquee-track span{
  padding:0 20px;
  font-size:12.5px; letter-spacing:.06em;
  color:#a5a1ac;
  font-family:ui-monospace,"SFMono-Regular",Consolas,monospace;
  white-space:nowrap;
}
.marquee-track i{
  font-style:normal; font-size:7px;
  color:var(--red-hi); opacity:.55;
}
@keyframes marquee{
  from{ transform:translateX(0); }
  to  { transform:translateX(-50%); }
}
.marquee:hover .marquee-track{ animation-play-state:paused; }

/* ================= 通用区块 ================= */
.section{
  position:relative;
  padding:118px 0;
  scroll-margin-top:84px;
}
.section-alt{
  background:linear-gradient(180deg,transparent,var(--bg-2) 12%,var(--bg-2) 88%,transparent);
  border-top:1px solid var(--line-soft);
  border-bottom:1px solid var(--line-soft);
}
.wrap{ max-width:1200px; margin:0 auto; padding:0 28px; }

.section-head{
  max-width:700px; margin:0 auto 62px;
  text-align:center;
}
.kicker{
  display:inline-block;
  font-family:ui-monospace,"SFMono-Regular",Consolas,monospace;
  font-size:11px; letter-spacing:.26em;
  color:var(--red-hi);
  margin-bottom:16px;
  position:relative;
}
.section-head h2{
  font-size:clamp(25px,3.3vw,40px);
  line-height:1.28;
  font-weight:700;
  letter-spacing:-.02em;
  margin-bottom:16px;
}
.section-head p{
  font-size:15px; color:var(--muted); line-height:1.85;
}

/* ================= 产品卡片 ================= */
.products{
  display:grid;
  grid-template-columns:repeat(3,1fr);
  align-items:stretch;
  gap:18px;
}

/* 产品数量会持续增长：不写死总数，用取模规则让最后一行自动居中，
   3n+1 张 → 末张居中；3n+2 张 → 末两张居中。加卡不用改样式。
   ⚠️ 这条规则只在三列布局下成立：一旦降到两列或一列，grid-column:2 会凭空
   生成第二列，把页面撑宽、手机上右侧整块被裁掉。所以必须锁在 min-width 里。 */
@media (min-width:1081px){
  .products > .card:last-child:nth-child(3n+1){ grid-column:2; }
  .products > .card:nth-last-child(2):nth-child(3n+1){ grid-column:2; }
}

.card{
  position:relative;
  display:flex;
  flex-direction:column;
  padding:26px 24px 20px;
  border-radius:var(--radius);
  border:1px solid var(--line-soft);
  background:
    linear-gradient(180deg,rgba(255,255,255,.062),rgba(255,255,255,.028));
  overflow:hidden;
  transition:border-color .4s, transform .5s var(--ease), background .4s;
  will-change:transform;
}
.card::before{
  content:"";
  position:absolute; top:0; left:0; right:0; height:1px;
  background:linear-gradient(90deg,transparent,rgba(255,90,110,.7),rgba(255,138,102,.7),transparent);
  opacity:0; transition:opacity .45s;
}
.card::after{
  content:"";
  position:absolute;
  width:260px; height:260px;
  left:var(--mx,50%); top:var(--my,0%);
  transform:translate(-50%,-50%);
  background:radial-gradient(circle,rgba(255,90,110,.13),transparent 65%);
  opacity:0; transition:opacity .5s;
  pointer-events:none;
}
.card:hover{
  border-color:rgba(255,140,150,.32);
  background:linear-gradient(180deg,rgba(255,255,255,.09),rgba(255,255,255,.02));
  transform:translateY(-5px);
}
.card:hover::before{ opacity:1; }
.card:hover::after{ opacity:1; }

.card-ico{
  width:44px; height:44px;
  display:grid; place-items:center;
  border-radius:12px;
  border:1px solid var(--line);
  background:linear-gradient(160deg,rgba(255,90,110,.14),rgba(255,138,102,.10));
  margin-bottom:18px;
}
.card-ico svg{
  width:21px; height:21px;
  fill:none; stroke:#ff8f9b; stroke-width:1.6;
  stroke-linecap:round; stroke-linejoin:round;
}

.tag{
  display:inline-block;
  align-self:flex-start;
  padding:3px 9px; border-radius:6px;
  border:1px solid rgba(255,90,110,.26);
  background:rgba(255,90,110,.08);
  font-size:10.5px; letter-spacing:.1em;
  color:#ff8f9b;
  font-family:ui-monospace,"SFMono-Regular",Consolas,monospace;
  margin-bottom:12px;
}

.card h3{
  font-size:19.5px; font-weight:700;
  letter-spacing:-.01em;
  margin-bottom:5px;
}
.card-sub{
  font-size:12.5px; color:var(--dim);
  margin-bottom:16px;
  letter-spacing:.02em;
}
.card ul{ display:flex; flex-direction:column; gap:7px; flex:1 1 auto; }
.card ul li{
  position:relative;
  padding-left:15px;
  font-size:13px; line-height:1.7;
  color:var(--muted);
}
.card ul li::before{
  content:"";
  position:absolute; left:0; top:9px;
  width:5px; height:5px;
  border-radius:1px;
  background:linear-gradient(135deg,var(--red-hi),var(--warm));
  transform:rotate(45deg);
  opacity:.85;
}

.card-foot{
  margin-top:18px; padding-top:14px;
  border-top:1px solid var(--line-soft);
  font-family:ui-monospace,"SFMono-Regular",Consolas,monospace;
  font-size:10.5px; letter-spacing:.04em;
  color:var(--dim);
}

/* ================= 技术底座 ================= */
.stack-grid{
  display:grid;
  grid-template-columns:repeat(3,1fr);
  gap:16px;
}
.stack{
  padding:24px 22px;
  border-radius:14px;
  border:1px solid var(--line-soft);
  background:rgba(255,255,255,.045);
  transition:border-color .35s, background .35s;
}
.stack:hover{
  border-color:rgba(255,140,150,.26);
  background:rgba(255,255,255,.04);
}
.stack h4{
  font-size:13px; font-weight:600;
  letter-spacing:.14em;
  color:#beb9c2;
  margin-bottom:16px;
  font-family:ui-monospace,"SFMono-Regular",Consolas,monospace;
  text-transform:uppercase;
}
.chips{ display:flex; flex-wrap:wrap; gap:7px; }
.chips span{
  padding:5px 11px;
  border-radius:7px;
  border:1px solid var(--line);
  background:rgba(255,255,255,.052);
  font-size:11.5px; color:var(--muted);
  letter-spacing:.02em;
  transition:color .3s, border-color .3s, background .3s;
}
.stack:hover .chips span{
  color:#d6d1d8;
  border-color:rgba(255,90,110,.22);
  background:rgba(255,90,110,.05);
}

/* ================= 案例 ================= */
.cases{ display:flex; flex-direction:column; gap:18px; }

.case{
  display:grid;
  grid-template-columns:140px 1fr;
  gap:28px;
  padding:34px 34px 32px;
  border-radius:var(--radius);
  border:1px solid var(--line-soft);
  background:linear-gradient(100deg,rgba(255,255,255,.058),rgba(255,255,255,.028));
  transition:border-color .4s, background .4s;
}
.case:hover{
  border-color:rgba(255,140,150,.28);
  background:linear-gradient(100deg,rgba(255,255,255,.08),rgba(255,255,255,.018));
}
.case-num{
  font-size:clamp(38px,5vw,62px);
  font-weight:800;
  line-height:1;
  letter-spacing:-.04em;
  background:linear-gradient(160deg,rgba(255,90,110,.85),rgba(255,138,102,.5) 70%,transparent);
  -webkit-background-clip:text; background-clip:text;
  -webkit-text-fill-color:transparent;
  font-variant-numeric:tabular-nums;
  opacity:.9;
}
.case-body h3{
  font-size:clamp(18px,2.1vw,23px);
  font-weight:700;
  line-height:1.45;
  margin:12px 0 18px;
  letter-spacing:-.01em;
}
.case-problem,.case-solve{
  font-size:13.8px; line-height:1.85;
  color:#a09da8;
  margin-bottom:9px;
  padding-left:14px;
  border-left:2px solid var(--line);
}
.case-problem b{ color:#ffb27a; font-weight:600; margin-right:6px; }
.case-solve{ border-left-color:rgba(255,90,110,.45); }
.case-solve b{ color:var(--red-hi); font-weight:600; margin-right:6px; }
.case-solve code{
  font-family:ui-monospace,"SFMono-Regular",Consolas,monospace;
  font-size:12.2px;
  padding:1px 5px; border-radius:4px;
  background:rgba(255,90,110,.1);
  color:#ff9aa4;
}
.case-meta{
  margin-top:16px;
  font-family:ui-monospace,"SFMono-Regular",Consolas,monospace;
  font-size:11px; letter-spacing:.08em;
  color:var(--dim);
}

/* ================= 关于 ================= */
.about-wrap{
  display:grid;
  grid-template-columns:1.05fr .95fr;
  gap:70px;
  align-items:start;
}
.about-left .kicker{ margin-bottom:14px; }
.about-left h2{
  font-size:clamp(24px,3vw,36px);
  line-height:1.32; font-weight:700;
  letter-spacing:-.02em;
  margin-bottom:26px;
}
.about-left p{
  font-size:14.5px; line-height:1.95;
  color:#a09da8;
  margin-bottom:16px;
}
.about-note{
  padding:14px 18px;
  border-radius:12px;
  border:1px solid var(--line-soft);
  border-left:2px solid rgba(255,90,110,.55);
  background:rgba(255,90,110,.04);
  font-size:13px !important;
  color:#b2adb8 !important;
  margin-top:24px;
}

.about-right{ display:flex; flex-direction:column; gap:0; }
.principle{
  padding:22px 0;
  border-top:1px solid var(--line-soft);
}
.principle:first-child{ border-top:0; padding-top:0; }
.principle b{
  display:inline-block;
  font-family:ui-monospace,"SFMono-Regular",Consolas,monospace;
  font-size:11px; letter-spacing:.14em;
  color:var(--red-hi);
  margin-bottom:9px;
}
.principle h4{
  font-size:16.5px; font-weight:650;
  margin-bottom:7px;
  letter-spacing:-.005em;
}
.principle p{ font-size:13.3px; line-height:1.75; color:var(--muted); }

/* ================= 联系 ================= */
.contact{ padding-bottom:130px; }
.contact-card{
  position:relative;
  border-radius:26px;
  border:1px solid var(--line);
  background:
    radial-gradient(ellipse 70% 100% at 50% 0%,rgba(226,49,75,.14),transparent 70%),
    linear-gradient(180deg,rgba(255,255,255,.072),rgba(255,255,255,.028));
  overflow:hidden;
  padding:76px 48px 68px;
  text-align:center;
}
.contact-glow{
  position:absolute; top:-50%; left:50%; transform:translateX(-50%);
  width:760px; height:520px;
  background:radial-gradient(ellipse,rgba(255,90,110,.20),transparent 65%);
  filter:blur(70px);
  pointer-events:none;
}
.contact-inner{ position:relative; z-index:2; }
.contact-inner h2{
  font-size:clamp(23px,2.9vw,34px);
  line-height:1.35; font-weight:700;
  letter-spacing:-.02em;
  margin:14px 0 14px;
}
.contact-inner > p{
  font-size:14.5px; color:var(--muted);
  max-width:520px; margin:0 auto 40px;
  line-height:1.85;
}

.contact-list{
  display:grid;
  grid-template-columns:repeat(4,1fr);
  gap:12px;
  margin-bottom:40px;
}
.contact-item{
  padding:18px 16px;
  border-radius:12px;
  border:1px solid var(--line-soft);
  background:rgba(255,255,255,.048);
  text-align:left;
  transition:border-color .3s, background .3s, transform .3s var(--ease);
}
a.contact-item:hover{
  border-color:rgba(255,90,110,.36);
  background:rgba(255,90,110,.05);
  transform:translateY(-2px);
}
.ci-label{
  display:block;
  font-size:10.5px; letter-spacing:.16em;
  color:var(--dim);
  font-family:ui-monospace,"SFMono-Regular",Consolas,monospace;
  margin-bottom:7px;
}
.ci-value{
  display:block;
  font-size:13.5px; color:#ded8de;
  letter-spacing:.01em;
  word-break:break-all;
}

/* ================= 页脚 ================= */
.footer{
  border-top:1px solid var(--line-soft);
  background:var(--bg-3);
  padding:44px 0 38px;
}
.footer-inner{
  display:grid;
  grid-template-columns:1fr auto;
  gap:26px 40px;
  align-items:start;
}
.footer-brand{ display:flex; align-items:center; gap:16px; }
.footer-mark{ width:36px; height:36px; flex:0 0 36px; display:block; }
.footer-brand strong{ display:block; font-size:14px; font-weight:600; }
.footer-brand em{
  display:block; margin-top:3px;
  font-style:normal; font-size:11px; letter-spacing:.1em;
  color:var(--dim);
  font-family:ui-monospace,"SFMono-Regular",Consolas,monospace;
}
.footer-links{ display:flex; gap:24px; flex-wrap:wrap; }
.footer-links a{
  font-size:13px; color:var(--muted);
  transition:color .25s;
}
.footer-links a:hover{ color:var(--red-hi); }

.footer-legal{
  grid-column:1 / -1;
  display:flex; justify-content:space-between; gap:16px;
  flex-wrap:wrap;
  padding-top:24px;
  border-top:1px solid var(--line-soft);
  font-size:11.5px; color:var(--dim);
  letter-spacing:.02em;
}
.footer-legal a{ transition:color .25s; }
.footer-legal a:hover{ color:var(--muted); }

/* ================= 滚动入场 ================= */
.reveal{
  opacity:0;
  transform:translateY(26px);
  transition:opacity .85s var(--ease), transform .85s var(--ease);
}
.reveal.in{ opacity:1; transform:none; }
.reveal[data-delay="1"]{ transition-delay:.09s; }
.reveal[data-delay="2"]{ transition-delay:.18s; }
.reveal[data-delay="3"]{ transition-delay:.27s; }
.reveal[data-delay="4"]{ transition-delay:.36s; }

/* 首屏入场：只做位移，不做透明度——任何渲染环境都不会出现空白 */
.hero .reveal{
  opacity:1;
  transform:none;
  animation:heroIn .9s var(--ease) both;
}
.hero .reveal[data-delay="1"]{ animation-delay:.08s; }
.hero .reveal[data-delay="2"]{ animation-delay:.16s; }
.hero .reveal[data-delay="3"]{ animation-delay:.24s; }
.hero .reveal[data-delay="4"]{ animation-delay:.32s; }
@keyframes heroIn{
  from{ transform:translateY(18px); }
  to  { transform:translateY(0); }
}

/* ================= 响应式 ================= */
@media (max-width:1080px){
  .products{ grid-template-columns:repeat(2,1fr); }
  .stack-grid{ grid-template-columns:repeat(2,1fr); }
  .about-wrap{ gap:48px; }
}

@media (max-width:900px){
  .nav-links{
    position:fixed; top:74px; left:0; right:0;
    flex-direction:column; align-items:stretch;
    gap:4px; padding:14px 20px 22px;
    background:rgba(10,17,32,.97);
    backdrop-filter:blur(20px);
    -webkit-backdrop-filter:blur(20px);
    border-bottom:1px solid var(--line);
    transform:translateY(-12px);
    opacity:0; pointer-events:none;
    transition:opacity .3s var(--ease), transform .3s var(--ease);
  }
  .nav-links.open{
    opacity:1; transform:none; pointer-events:auto;
  }
  .nav-links a{ padding:13px 14px; font-size:15px; }
  .nav-links a.nav-cta{ margin-left:0; margin-top:6px; text-align:center; }
  .nav-toggle{ display:flex; }

  .about-wrap{ grid-template-columns:1fr; gap:40px; }
  .contact-list{ grid-template-columns:repeat(2,1fr); }
  .case{ grid-template-columns:1fr; gap:14px; padding:28px 24px; }
  .case-num{ font-size:34px; }
}

@media (max-width:640px){
  .section{ padding:78px 0; }
  .wrap{ padding:0 20px; }
  .nav-inner{ padding:0 20px; height:66px; }
  .nav-links{ top:66px; }
  .hero{ padding:104px 20px 84px; }
  .hero::after{ display:none; }
  .hero-title{ font-size:clamp(29px,8.4vw,42px); }
  .hero-sub br{ display:none; }
  .hero-actions{ flex-direction:column; align-items:stretch; }
  .btn{ justify-content:center; }
  .hero-metrics{ grid-template-columns:repeat(2,1fr); gap:26px 0; }
  .metric:nth-child(3)::before{ display:none; }
  .products{ grid-template-columns:1fr; }
  .stack-grid{ grid-template-columns:1fr; }
  .contact-card{ padding:52px 22px 48px; border-radius:20px; }
  .contact-list{ grid-template-columns:1fr; }
  .section-head{ margin-bottom:44px; }
  .footer-inner{ grid-template-columns:1fr; }
  .scroll-hint{ display:none; }
}

@media (prefers-reduced-motion:reduce){
  *{ animation-duration:.001ms !important; animation-iteration-count:1 !important; transition-duration:.001ms !important; }
  html{ scroll-behavior:auto; }
  .reveal{ opacity:1; transform:none; }
}