/* ============================================================
   三角洲行动辅助 · 69zi.com 动态版
   暗黑战术风：碳黑底 + 荧光红品牌 + 精密网格 + 等宽标签
   ============================================================ */
:root{
  --bg:#060608;
  --bg2:#0b0b0e;
  --bg3:#101014;
  --panel:rgba(255,255,255,.03);
  --panel-2:rgba(255,255,255,.055);
  --line:rgba(255,255,255,.08);
  --line-2:rgba(255,255,255,.14);
  --brand:#ff003c;
  --brand-dim:rgba(255,0,60,.12);
  --brand-glow:rgba(255,0,60,.38);
  --text:#f4f4f5;
  --text-2:#a1a1aa;
  --text-3:#63636b;
  --mono:"JetBrains Mono",ui-monospace,Consolas,monospace;
  --sans:"Inter","Noto Sans SC",system-ui,-apple-system,"PingFang SC","Microsoft YaHei",sans-serif;
  --maxw:1180px;
  --radius:14px;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  background:var(--bg);
  color:var(--text);
  font-family:var(--sans);
  -webkit-font-smoothing:antialiased;
  line-height:1.6;
  overflow-x:hidden;
}
body::before{
  content:"";
  position:fixed;inset:0;z-index:0;pointer-events:none;
  background:
    radial-gradient(1200px 600px at 80% -10%, rgba(255,0,60,.06), transparent 60%),
    linear-gradient(rgba(255,255,255,.022) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.022) 1px, transparent 1px);
  background-size:auto,56px 56px,56px 56px;
  mask-image:linear-gradient(180deg,#000 0%,transparent 70%);
  -webkit-mask-image:linear-gradient(180deg,#000 0%,transparent 70%);
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
i.ph{line-height:1}
.container{max-width:var(--maxw);margin:0 auto;padding:0 24px;position:relative;z-index:1}

/* ---------- 导航 ---------- */
.nav{
  position:fixed;top:0;left:0;right:0;z-index:100;
  border-bottom:1px solid var(--line);
  background:rgba(6,6,8,.72);
  backdrop-filter:blur(18px) saturate(140%);
  -webkit-backdrop-filter:blur(18px) saturate(140%);
}
.nav-inner{display:flex;align-items:center;justify-content:space-between;height:68px}
.logo{display:flex;align-items:center;gap:12px}
.logo-mark{
  width:30px;height:30px;border-radius:6px;
  background:var(--brand);
  display:flex;align-items:center;justify-content:center;
  font-weight:900;font-size:15px;color:#fff;
  transform:rotate(45deg);
  box-shadow:0 0 18px var(--brand-glow);
}

.logo-mark{position:relative}
.logo-mark span{display:block;transform:rotate(-45deg)}
.logo-text{font-weight:900;font-size:17px;letter-spacing:-.01em;text-transform:uppercase;font-style:italic}
.nav-links{display:flex;align-items:center;gap:28px}
.nav-link{
  font-size:12px;font-weight:700;letter-spacing:.14em;text-transform:uppercase;
  color:var(--text-2);transition:color .15s;position:relative;padding:6px 0;
}
.nav-link:hover,.nav-link.is-active{color:#fff}
.nav-link.is-active::after{
  content:"";position:absolute;left:0;right:0;bottom:0;height:2px;
  background:var(--brand);box-shadow:0 0 8px var(--brand-glow);
}
.nav-cta{
  font-size:12px;font-weight:800;letter-spacing:.1em;text-transform:uppercase;
  padding:9px 18px;border:1px solid var(--brand);color:var(--brand);
  border-radius:6px;display:inline-flex;align-items:center;gap:8px;
  transition:all .18s;
}
.nav-cta:hover{background:var(--brand);color:#fff;box-shadow:0 0 20px var(--brand-glow)}
.nav-toggle{
  display:none;background:none;border:1px solid var(--line-2);color:var(--text);
  width:40px;height:40px;border-radius:8px;font-size:20px;cursor:pointer;
  align-items:center;justify-content:center;
}

/* ---------- HERO ---------- */
.hero{
  position:relative;padding:170px 0 110px;overflow:hidden;
  background:
    radial-gradient(900px 460px at 50% 0%, var(--brand-dim), transparent 65%);
}
.hero-bg{position:absolute;inset:0;pointer-events:none}
.hero-deco{
  position:absolute;font-family:var(--mono);font-weight:800;
  font-size:clamp(64px,11vw,170px);letter-spacing:-.04em;
  color:transparent;-webkit-text-stroke:1px rgba(255,255,255,.07);
  text-transform:uppercase;user-select:none;line-height:1;
}
.hero-deco-l{top:120px;left:-8px;writing-mode:vertical-rl}
.hero-deco-r{bottom:60px;right:-10px;writing-mode:vertical-rl}
.hero-inner{text-align:center;display:flex;flex-direction:column;align-items:center}
.hero-badge{
  display:inline-flex;align-items:center;gap:8px;
  font-family:var(--mono);font-size:11px;letter-spacing:.28em;text-transform:uppercase;
  color:var(--brand);border:1px solid rgba(255,0,60,.28);
  background:rgba(255,0,60,.06);padding:8px 16px;border-radius:999px;
  margin-bottom:34px;animation:pulse 2.6s ease-in-out infinite;
}
.hero-badge::before{content:"";width:6px;height:6px;border-radius:50%;background:var(--brand);box-shadow:0 0 8px var(--brand-glow)}
@keyframes pulse{0%,100%{opacity:1}50%{opacity:.62}}
.hero-title{
  font-size:clamp(44px,7.2vw,92px);font-weight:900;letter-spacing:-.035em;
  line-height:1.04;margin-bottom:28px;
}
.hero-line{display:block}
.hero-line-hl{
  background:linear-gradient(92deg,#ff2d5c,#ff003c 45%,#b3002b);
  -webkit-background-clip:text;background-clip:text;color:transparent;
}
.hero-desc{
  max-width:640px;color:var(--text-2);font-size:16.5px;font-weight:400;
  margin-bottom:44px;line-height:1.9;
}
.hero-actions{display:flex;gap:16px;flex-wrap:wrap;justify-content:center}
.btn{
  display:inline-flex;align-items:center;gap:10px;
  font-size:15px;font-weight:800;letter-spacing:.12em;text-transform:uppercase;
  padding:17px 40px;border-radius:8px;transition:all .18s;
}
.btn-primary{
  background:var(--brand);color:#fff;position:relative;overflow:hidden;
  box-shadow:0 10px 30px rgba(255,0,60,.28);
}
.btn-primary::after{
  content:"";position:absolute;top:-60%;left:-60%;width:60%;height:220%;
  background:linear-gradient(100deg,transparent,rgba(255,255,255,.35),transparent);
  transform:rotate(22deg);transition:left .6s ease;
}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 14px 40px rgba(255,0,60,.4)}
.btn-primary:hover::after{left:140%}
.btn-ghost{
  color:#fff;background:var(--panel);
  border:1px solid var(--line-2);
}
.btn-ghost:hover{background:var(--panel-2);border-color:rgba(255,255,255,.24);transform:translateY(-2px)}
.hero-edge{
  position:absolute;left:0;right:0;bottom:0;height:1px;
  background:linear-gradient(90deg,transparent,var(--brand),transparent);
}

/* ---------- 分区通用 ---------- */
.section{padding:108px 0;position:relative}
.section-dark{background:var(--bg2);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.sec-head{margin-bottom:64px}
.sec-head.center{text-align:center;display:flex;flex-direction:column;align-items:center}
.sec-code{
  font-family:var(--mono);font-size:12px;letter-spacing:.3em;color:var(--brand);
  text-transform:uppercase;display:inline-flex;align-items:center;gap:10px;margin-bottom:14px;
}
.sec-code::before{content:"";width:26px;height:1px;background:var(--brand)}
.sec-head.center .sec-code::after{content:"";width:26px;height:1px;background:var(--brand)}
.sec-title{font-size:clamp(30px,4.4vw,46px);font-weight:900;letter-spacing:-.02em;line-height:1.15}
.sec-title-hl{color:var(--brand)}
.sec-desc{color:var(--text-2);max-width:560px;margin:18px auto 0;font-size:15px}

/* ---------- 功能矩阵 ---------- */
.feat-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
.feat-card{
  position:relative;background:var(--panel);border:1px solid var(--line);
  border-radius:var(--radius);padding:30px 26px;overflow:hidden;
  transition:transform .3s cubic-bezier(.2,.8,.2,1),border-color .3s,box-shadow .3s;
}
.feat-card:hover{
  transform:translateY(-5px);border-color:rgba(255,0,60,.45);
  box-shadow:0 18px 44px rgba(0,0,0,.5),0 0 30px rgba(255,0,60,.1);
}
.feat-icon{
  width:46px;height:46px;border-radius:10px;display:flex;align-items:center;justify-content:center;
  font-size:22px;color:var(--brand);background:var(--brand-dim);
  border:1px solid rgba(255,0,60,.2);margin-bottom:18px;
}
.feat-title{font-size:17px;font-weight:800;margin-bottom:8px}
.feat-desc{font-size:13px;color:var(--text-2);line-height:1.7}
.feat-index{
  position:absolute;top:16px;right:18px;font-family:var(--mono);
  font-size:12px;color:var(--text-3);letter-spacing:.1em;
}

/* ---------- 接入端口 ---------- */
.port-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;align-items:stretch}
.port-card{
  position:relative;background:var(--panel);border:1px solid var(--line);
  border-radius:var(--radius);padding:40px 32px;display:flex;flex-direction:column;
  transition:transform .3s cubic-bezier(.2,.8,.2,1),border-color .3s,box-shadow .3s;
}
.port-card:hover{transform:translateY(-5px);border-color:var(--line-2)}
.port-card.is-featured{
  background:linear-gradient(180deg,rgba(255,0,60,.09),rgba(255,255,255,.02) 60%);
  border-color:rgba(255,0,60,.5);
  box-shadow:0 24px 60px rgba(0,0,0,.5),0 0 44px rgba(255,0,60,.12);
  z-index:2;
}
.port-badge{
  position:absolute;top:-13px;left:50%;transform:translateX(-50%);
  background:var(--brand);color:#fff;font-size:10px;font-weight:900;
  letter-spacing:.22em;text-transform:uppercase;padding:6px 18px;border-radius:4px;
  box-shadow:0 6px 18px var(--brand-glow);white-space:nowrap;
}
.port-tag{font-family:var(--mono);font-size:11px;color:var(--text-3);letter-spacing:.08em;text-transform:uppercase;margin-bottom:14px}
.port-title{font-size:26px;font-weight:900;margin-bottom:26px;display:flex;align-items:center;gap:14px}
.port-title::before{content:"";width:4px;height:26px;background:var(--brand);box-shadow:0 0 10px var(--brand-glow);border-radius:2px}
.port-title.is-hl{color:var(--brand)}
.port-points{list-style:none;margin-bottom:36px;flex:1}
.port-points li{
  position:relative;padding-left:20px;color:var(--text-2);
  font-size:14px;margin-bottom:12px;line-height:1.6;
}
.port-points li::before{
  content:"";position:absolute;left:0;top:9px;width:6px;height:6px;
  background:var(--brand);transform:rotate(45deg);
}
.port-btn{
  display:block;text-align:center;padding:14px;border-radius:7px;
  border:1px solid var(--line-2);color:var(--text);font-size:12px;font-weight:800;
  letter-spacing:.18em;text-transform:uppercase;transition:all .18s;
}
.port-btn.is-solid{background:#fff;color:#000;border-color:#fff}
.port-btn.is-solid:hover{background:var(--brand);border-color:var(--brand);color:#fff}
.port-btn:not(.is-solid):not(.is-disabled):hover{border-color:var(--brand);color:var(--brand)}
.port-btn.is-disabled{opacity:.55;cursor:not-allowed}

/* ---------- 使用指南 ---------- */
.guide-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.guide-step{position:relative;padding:26px 0 0}
.guide-num{
  font-family:var(--mono);font-size:72px;font-weight:800;line-height:1;
  color:transparent;-webkit-text-stroke:1px rgba(255,0,60,.55);
  display:block;margin-bottom:18px;opacity:.8;
}
.guide-title{font-size:20px;font-weight:800;margin-bottom:12px}
.guide-desc{font-size:14px;color:var(--text-2);line-height:1.85}

/* ---------- 实测证据 ---------- */
.visual-head{
  display:flex;align-items:flex-end;justify-content:space-between;
  margin-bottom:44px;gap:24px;
}
.visual-code{font-family:var(--mono);font-size:12px;color:var(--text-3);letter-spacing:.24em;text-transform:uppercase}
.visual-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:18px}
.visual-item{
  position:relative;border-radius:12px;overflow:hidden;
  border:1px solid var(--line);background:var(--bg3);aspect-ratio:16/9;
}
.visual-item img{width:100%;height:100%;object-fit:cover;transition:transform .7s cubic-bezier(.2,.8,.2,1)}
.visual-item:hover img{transform:scale(1.05)}
.visual-item figcaption{
  position:absolute;inset:0;display:flex;align-items:center;justify-content:center;
  background:rgba(255,0,60,.08);opacity:0;transition:opacity .25s;
  font-size:12px;font-weight:800;letter-spacing:.2em;text-transform:uppercase;
  color:#fff;border:1px solid rgba(255,255,255,.4);margin:14px;border-radius:8px;
}
.visual-item:hover figcaption{opacity:1}

/* ---------- 为何选择我们 ---------- */
.why-wrap{display:grid;grid-template-columns:1.15fr .85fr;gap:72px;align-items:start}
.why-item{display:flex;gap:22px;margin-top:36px}
.why-num{font-size:34px;font-weight:900;color:var(--brand);font-style:italic;line-height:1}
.why-title{font-size:19px;font-weight:800;margin-bottom:10px}
.why-desc{font-size:14px;color:var(--text-2);line-height:1.85}
.monitor{
  position:relative;background:#08080b;border:1px solid var(--line);
  padding:40px 36px;box-shadow:0 30px 80px rgba(0,0,0,.55);
}
.monitor-corner{
  position:absolute;top:-2px;left:-2px;width:44px;height:44px;
  border-top:2px solid var(--brand);border-left:2px solid var(--brand);
}
.monitor-title{font-size:17px;font-weight:800;letter-spacing:.08em;text-transform:uppercase;color:var(--brand);margin-bottom:28px}
.monitor-list{border:1px solid var(--line);margin-bottom:28px}
.monitor-row{
  display:flex;justify-content:space-between;align-items:center;
  padding:13px 16px;font-family:var(--mono);font-size:13px;
  border-bottom:1px solid var(--line);color:var(--text-2);
}
.monitor-row:last-child{border-bottom:none}
.monitor-row:nth-child(odd){background:rgba(255,255,255,.03)}
.monitor-status{display:inline-flex;align-items:center;gap:8px;color:#34d399;font-weight:700}
.monitor-status .dot{width:6px;height:6px;border-radius:50%;background:#34d399;box-shadow:0 0 8px rgba(52,211,153,.8);animation:pulse 2.2s infinite}
.monitor-port{font-family:var(--mono);font-size:10px;color:var(--text-3);letter-spacing:.3em;text-transform:uppercase;text-align:center;margin-bottom:14px}
.monitor-badge{
  display:block;text-align:center;background:var(--brand);color:#fff;
  font-size:12px;font-weight:900;letter-spacing:.14em;padding:13px;border-radius:6px;
  animation:pulse 2.6s infinite;
}

/* ---------- 用户反馈 ---------- */
.fb-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.fb-card{
  background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);
  padding:28px 26px;transition:transform .3s,border-color .3s;
}
.fb-card:hover{transform:translateY(-4px);border-color:var(--line-2)}
.fb-head{display:flex;align-items:center;gap:12px;margin-bottom:18px}
.fb-avatar{
  width:38px;height:38px;border-radius:50%;background:var(--brand);color:#fff;
  display:flex;align-items:center;justify-content:center;font-weight:800;font-size:14px;
  box-shadow:0 0 14px var(--brand-glow);
}
.fb-name{font-size:13.5px;font-weight:800}
.fb-duration{font-size:11.5px;color:var(--text-3)}
.fb-stars{margin-left:auto;color:#f59e0b;font-size:13px;letter-spacing:2px}
.fb-quote{font-size:13.5px;color:var(--text-2);line-height:1.8}

/* ---------- 页脚 ---------- */
.footer{
  border-top:1px solid var(--line);background:#040406;
  padding:84px 0 40px;text-align:center;position:relative;
}
.footer-brand-mark{
  font-size:clamp(60px,10vw,120px);font-weight:900;font-style:italic;
  letter-spacing:-.04em;color:transparent;-webkit-text-stroke:1px rgba(255,255,255,.08);
  user-select:none;line-height:1;margin-bottom:44px;text-transform:uppercase;
}
.footer-links{display:flex;justify-content:center;gap:34px;flex-wrap:wrap;margin-bottom:36px}
.footer-links a{font-size:13.5px;color:var(--text-2);transition:color .15s}
.footer-links a:hover{color:var(--brand)}
.footer-copy{font-family:var(--mono);font-size:11px;letter-spacing:.4em;text-transform:uppercase;color:var(--text-3)}
.footer-admin{
  display:inline-block;margin-top:26px;font-family:var(--mono);font-size:10px;
  letter-spacing:.3em;color:rgba(255,255,255,.22);text-transform:uppercase;
  border:1px solid var(--line);padding:8px 18px;border-radius:999px;transition:all .15s;
}
.footer-admin:hover{color:var(--text-2);border-color:var(--line-2)}

/* ---------- 悬浮购买按钮 ---------- */
.float-cart{
  position:fixed;bottom:34px;right:34px;z-index:90;
  width:58px;height:58px;border-radius:50%;
  background:var(--brand);color:#fff;display:flex;align-items:center;justify-content:center;
  font-size:24px;box-shadow:0 10px 30px rgba(255,0,60,.45);
  transition:transform .2s;
}
.float-cart:hover{transform:scale(1.1) rotate(8deg)}

/* ---------- 滚动显现 ---------- */
.reveal{opacity:0;transform:translateY(26px);transition:opacity .7s ease,transform .7s cubic-bezier(.2,.8,.2,1);transition-delay:var(--d,0ms)}
.reveal.in{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .reveal{opacity:1;transform:none;transition:none}
  .btn-primary::after,.hero-badge,.monitor-badge,.monitor-status i{animation:none}
}

/* ---------- 响应式 ---------- */
@media (max-width:1024px){
  .feat-grid{grid-template-columns:repeat(2,1fr)}
  .port-grid{grid-template-columns:1fr;max-width:520px;margin:0 auto}
  .port-card.is-featured{order:-1}
  .guide-grid{grid-template-columns:1fr;max-width:520px;margin:0 auto}
  .why-wrap{grid-template-columns:1fr;gap:56px}
  .fb-grid{grid-template-columns:1fr;max-width:560px;margin:0 auto}
  .hero-deco{opacity:.5}
}
@media (max-width:760px){
  .nav-toggle{display:flex}
  .nav-links{
    position:fixed;top:68px;left:0;right:0;z-index:99;
    flex-direction:column;align-items:stretch;gap:0;
    background:rgba(6,6,8,.96);border-bottom:1px solid var(--line);
    padding:12px 24px 20px;display:none;
  }
  .nav-links.open{display:flex}
  .nav-link{padding:13px 0;border-bottom:1px solid var(--line)}
  .nav-link.is-active::after{display:none}
  .nav-cta{margin-top:14px;justify-content:center}
  .section{padding:76px 0}
  .hero{padding:130px 0 80px}
  .hero-deco{display:none}
  .visual-grid{grid-template-columns:1fr}
  .visual-head{flex-direction:column;align-items:flex-start}
  .float-cart{bottom:20px;right:20px;width:52px;height:52px}
}