:root{
  --panda-black:#eef1f6;
  --panda-white:#0c3a66;
  --panda-gray:rgba(238,241,246,.62);
  --panda-bg:transparent;
  --panda-accent:#2f6fed;
  --panda-accent-dark:#1f4fbf;
  --panda-border:rgba(255,255,255,.14);
  --panda-card:rgba(255,255,255,.05);
  --radius:16px;
  --shadow:0 20px 50px rgba(0,0,0,.5);
  --maxw:1120px;
  color-scheme:dark;
}
*{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;
  font-family:"PingFang SC","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;
  color:var(--panda-black);
  background:var(--panda-bg);
  line-height:1.6;
  overscroll-behavior-y:contain;
  position:relative;
}
a{color:inherit;text-decoration:none;}

/* ====== 全站背景层：天蓝色云雾效果 ======
   替换成自己的图片时，只需把 .site-bg 的 background-image
   换成 url(你的图片路径)，并保留 background-size:cover /
   background-position:center，即可铺满整站背景。 ====== */
.site-bg{
  position:fixed;inset:0;z-index:-3;overflow:hidden;
  background:linear-gradient(160deg,#0d5aa1 0%,#1f80c7 45%,#57b2e6 100%);
}
.site-bg::before{
  content:"";position:absolute;inset:-10% -10% -30% -10%;
  background-image:
    radial-gradient(ellipse 70% 40% at 20% 28%, rgba(255,255,255,.11), transparent 60%),
    radial-gradient(ellipse 60% 35% at 78% 52%, rgba(255,255,255,.08), transparent 60%),
    radial-gradient(ellipse 55% 30% at 45% 82%, rgba(255,255,255,.06), transparent 60%);
  filter:blur(6px);
}
.bg-fx{
  position:absolute;inset:0;width:100%;height:100%;display:block;
}
.panda-fx-wrap{
  position:absolute;top:78px;right:4%;width:320px;height:320px;
  pointer-events:none;opacity:.6;z-index:0;
}
#pandaFx{position:absolute;inset:0;width:100%;height:100%;display:block;}
@media (max-width:1080px){
  .panda-fx-wrap{display:none;}
}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0;}
:focus-visible{outline:2px solid var(--panda-accent);outline-offset:2px;}
.skip-link{
  position:absolute;left:-9999px;top:0;z-index:100;
  background:var(--panda-accent);color:#fff;padding:12px 20px;border-radius:0 0 8px 0;
  font-size:14px;font-weight:600;
}
.skip-link:focus{left:0;}
.container{max-width:var(--maxw);margin:0 auto;padding:0 24px;}
section{padding:88px 0;}
h1,h2,h3{line-height:1.25;margin:0 0 16px;}
h2{font-size:32px;}
h3{font-size:20px;}
p{margin:0 0 16px;color:var(--panda-gray);}

/* ---------- Nav ---------- */
.nav{
  position:sticky;top:0;z-index:50;
  background:rgba(13,90,161,.72);
  backdrop-filter:saturate(180%) blur(10px);
  border-bottom:1px solid var(--panda-border);
}
.nav .container{
  display:flex;align-items:center;justify-content:space-between;
  height:68px;
}
.brand{display:flex;align-items:center;gap:10px;font-weight:700;font-size:18px;}
.brand-mark{font-size:24px;line-height:1;}
.nav-links{display:flex;gap:32px;font-size:15px;color:var(--panda-black);}
.nav-links a{position:relative;padding:4px 0;}
.nav-links a:hover{color:var(--panda-accent);}
.nav-links a.active{color:var(--panda-accent);}
.nav-links a.active::after{
  content:"";position:absolute;left:0;right:0;bottom:-4px;height:2px;background:var(--panda-accent);border-radius:2px;
}
.nav-right{display:flex;align-items:center;gap:14px;}
.nav-cta{
  background:var(--panda-accent);color:#fff;
  padding:10px 20px;border-radius:999px;font-size:14px;font-weight:600;
}
.nav-cta:hover{background:var(--panda-accent-dark);}

.nav-toggle{
  display:none;flex-direction:column;justify-content:center;gap:5px;
  width:36px;height:36px;background:none;border:none;cursor:pointer;padding:0;
}
.nav-toggle span{display:block;width:22px;height:2px;background:var(--panda-black);border-radius:2px;transition:transform .2s ease, opacity .2s ease;}
.nav-toggle.open span:nth-child(1){transform:translateY(7px) rotate(45deg);}
.nav-toggle.open span:nth-child(2){opacity:0;}
.nav-toggle.open span:nth-child(3){transform:translateY(-7px) rotate(-45deg);}

.nav-mobile{
  display:none;flex-direction:column;gap:2px;
  max-height:0;overflow:hidden;transition:max-height .25s ease;
  border-top:1px solid var(--panda-border);background:var(--panda-white);
}
.nav-mobile a{padding:14px 24px;font-size:15px;color:var(--panda-black);border-bottom:1px solid rgba(255,255,255,.06);}
.nav-mobile a.nav-cta{
  margin:12px 24px;padding:12px 20px;text-align:center;border-bottom:none;
}
.nav-mobile.open{max-height:400px;overflow-y:auto;}
body.menu-open{overflow:hidden;}

/* ---------- Hero ---------- */
.hero{padding:96px 0 64px;text-align:center;}
.hero .eyebrow{
  display:inline-block;font-size:13px;letter-spacing:.04em;color:var(--panda-accent);
  background:rgba(47,111,237,.08);padding:6px 14px;border-radius:999px;margin-bottom:24px;font-weight:600;
}
.hero h1{font-size:44px;font-weight:800;max-width:760px;margin:0 auto 20px;}
.hero .sub{font-size:18px;max-width:600px;margin:0 auto 36px;}
.hero-actions{display:flex;gap:16px;justify-content:center;flex-wrap:wrap;margin-bottom:56px;}
.btn{
  display:inline-block;padding:14px 28px;border-radius:999px;font-weight:700;font-size:15px;
  transition:transform .15s ease, box-shadow .15s ease;
}
.btn-primary{background:var(--panda-accent);color:#fff;box-shadow:0 6px 20px rgba(47,111,237,.35);}
.btn-primary:hover{background:var(--panda-accent-dark);transform:translateY(-1px);}
.btn-ghost{background:rgba(255,255,255,.08);color:var(--panda-black);border:1px solid var(--panda-border);}
.btn-ghost:hover{border-color:var(--panda-accent);color:var(--panda-accent);background:rgba(255,255,255,.12);}

.hero-visual{
  max-width:920px;margin:0 auto;border-radius:var(--radius);overflow:hidden;
  box-shadow:var(--shadow);border:1px solid var(--panda-border);
}
/* ---------- Mockup panels (no binary images needed) ---------- */
.mockup{
  background:#fff;border-radius:var(--radius);overflow:hidden;
  box-shadow:var(--shadow);border:1px solid var(--panda-border);
}
.mockup-bar{
  display:flex;gap:6px;padding:12px 16px;background:#f2f1ef;border-bottom:1px solid rgba(0,0,0,.06);
}
.mockup-bar span{width:10px;height:10px;border-radius:50%;background:#d8d6d2;}
.mockup-bar span:nth-child(1){background:#f2867e;}
.mockup-bar span:nth-child(2){background:#f4c463;}
.mockup-bar span:nth-child(3){background:#8fd18a;}
.mockup-body{padding:36px 28px;text-align:center;}
.mockup-body .ml{margin:0 0 6px;font-size:14px;color:var(--panda-gray);}
.mockup-white .mockup-body{background:#fff;}
.mockup-white .mockup-body .ml{color:#5b6b7c;}
.mockup-poster .mockup-body{background:linear-gradient(135deg,#ffe1c4,#ffd0e0);}
.mockup-poster .ml{color:#7a4a2b;}

/* ---------- 拖拽对比滑块 ---------- */
.compare-slider{
  position:relative;display:grid;overflow:hidden;user-select:none;
  touch-action:pan-y;
}
.compare-pane{grid-area:1/1;padding:28px 24px;min-height:100%;}
.compare-pane .tag{
  display:inline-block;font-size:11px;font-weight:700;letter-spacing:.03em;color:#5b6b7c;
  background:#f2f1ef;padding:3px 10px;border-radius:999px;margin-bottom:14px;
}
.compare-pane .tag-accent{color:var(--panda-accent);background:rgba(47,111,237,.1);}
.compare-pane .ml{margin:0 0 10px;font-size:14px;color:#1b2733;line-height:1.5;}
.compare-pane .ml.en{font-family:Georgia,"Times New Roman",serif;}
.compare-after{background:rgba(47,111,237,.06);}
.compare-before{
  background:#fff;clip-path:inset(0 50% 0 0);
  border-right:1px dashed rgba(47,111,237,.3);
}
.compare-line{
  grid-area:1/1;position:relative;z-index:2;
  width:2px;left:50%;background:var(--panda-accent);
  pointer-events:none;box-shadow:0 0 0 4px rgba(47,111,237,.15);
}
.compare-range{
  grid-area:1/1;position:relative;z-index:3;width:100%;height:100%;
  margin:0;appearance:none;-webkit-appearance:none;background:transparent;cursor:ew-resize;
}
.compare-range::-webkit-slider-runnable-track{background:transparent;height:100%;}
.compare-range::-moz-range-track{background:transparent;height:100%;}
.compare-range::-webkit-slider-thumb{
  -webkit-appearance:none;appearance:none;
  width:36px;height:36px;border-radius:50%;margin-top:0;
  background:#fff;border:2px solid var(--panda-accent);
  box-shadow:0 4px 14px rgba(0,0,0,.2);cursor:ew-resize;
}
.compare-range::-moz-range-thumb{
  width:36px;height:36px;border-radius:50%;border:2px solid var(--panda-accent);
  background:#fff;box-shadow:0 4px 14px rgba(0,0,0,.2);cursor:ew-resize;
}
.compare-hint{text-align:center;font-size:13px;color:var(--panda-gray);margin:16px 0 0;}

/* ---------- 快捷键键帽插画 ---------- */
.hotkey-demo{
  display:flex;align-items:center;justify-content:center;gap:10px;margin:0 0 40px;
}
.hotkey-demo .key{
  display:inline-flex;align-items:center;justify-content:center;min-width:40px;height:40px;
  padding:0 12px;border-radius:10px;font-family:"SFMono-Regular",Consolas,Menlo,monospace;
  font-size:14px;font-weight:700;color:var(--panda-black);
  background:linear-gradient(180deg,#fff,#f0efec);
  border:1px solid rgba(0,0,0,.1);border-bottom:3px solid rgba(0,0,0,.18);
  box-shadow:0 2px 4px rgba(0,0,0,.06);
}
.hotkey-demo .plus{color:var(--panda-gray);font-size:14px;font-weight:700;}

/* ---------- 支持语言范围 ---------- */
.lang-scope{
  display:flex;align-items:center;justify-content:center;gap:10px;margin:20px 0 8px;
}
.lang-badge{
  display:inline-block;font-size:13px;font-weight:700;padding:6px 14px;border-radius:999px;
  background:rgba(255,255,255,.08);color:var(--panda-black);
}
.lang-badge-accent{background:rgba(47,111,237,.1);color:var(--panda-accent);}
.lang-arrow{color:var(--panda-gray);font-size:14px;}
.lang-note{font-size:13px;color:var(--panda-gray);max-width:520px;margin:0 auto;}

/* ---------- Back to top ---------- */
.back-to-top{
  position:fixed;right:24px;bottom:24px;z-index:60;
  width:44px;height:44px;border-radius:50%;border:1px solid var(--panda-border);cursor:pointer;
  background:var(--panda-accent);color:#fff;font-size:18px;line-height:1;
  display:flex;align-items:center;justify-content:center;
  box-shadow:0 8px 20px rgba(0,0,0,.35);
  opacity:0;transform:translateY(12px);pointer-events:none;
  transition:opacity .25s ease, transform .25s ease, background .2s ease;
}
.back-to-top.show{opacity:1;transform:none;pointer-events:auto;}
.back-to-top:hover{background:var(--panda-accent-dark);}

/* ---------- Scroll reveal ---------- */
.reveal{opacity:0;transform:translateY(28px);transition:opacity .6s ease, transform .6s ease;}
.reveal.in-view{opacity:1;transform:none;}
@media (prefers-reduced-motion: reduce){
  .reveal{opacity:1;transform:none;transition:none;}
}

@media print{
  .nav,.back-to-top,.skip-link,.lead-form,.share-btn,.share-toast,.nav-mobile,.site-bg{display:none!important;}
  body{background:#fff;color:#1b1b1b;}
  section{padding:24px 0;}
  .reveal{opacity:1!important;transform:none!important;}
}

/* ---------- Stats strip ---------- */
.stats{
  display:grid;grid-template-columns:repeat(4,1fr);gap:24px;
  max-width:var(--maxw);margin:0 auto;padding:0 24px 40px;
  text-align:center;
}
.stats .stat b{display:block;font-size:28px;color:var(--panda-black);}
.stats .stat span{font-size:13px;color:var(--panda-gray);}

/* ---------- Features ---------- */
.section-head{text-align:center;max-width:640px;margin:0 auto 56px;}
.section-head .eyebrow{color:var(--panda-accent);font-weight:700;font-size:13px;letter-spacing:.04em;text-transform:uppercase;display:block;margin-bottom:10px;}
.features-grid{
  display:grid;grid-template-columns:repeat(3,1fr);gap:24px;
}
.feature-card{
  background:var(--panda-card);border-radius:var(--radius);padding:28px;
  border:1px solid var(--panda-border);
  transition:transform .2s ease, box-shadow .2s ease, background .2s ease;
}
.feature-card:hover{transform:translateY(-4px);box-shadow:var(--shadow);background:rgba(255,255,255,.08);}
.feature-card .icon{
  width:44px;height:44px;border-radius:12px;background:rgba(47,111,237,.18);
  display:flex;align-items:center;justify-content:center;margin-bottom:16px;font-size:22px;
}
.feature-card h3{margin-bottom:8px;}
.feature-card p{margin:0;font-size:14px;}

/* ---------- Demo / How it works ---------- */
.demo-bg{background:rgba(255,255,255,.02);border-top:1px solid var(--panda-border);border-bottom:1px solid var(--panda-border);}
.demo-shots{display:grid;grid-template-columns:1fr 1fr;gap:24px;margin-top:16px;}
.demo-shots figure{margin:0;border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);border:1px solid var(--panda-border);}
.demo-shots figcaption{font-size:13px;color:var(--panda-gray);padding:12px 16px;background:rgba(255,255,255,.04);}
.demo-shots .wide{grid-column:1 / -1;}

.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;margin-top:56px;}
.step{text-align:center;}
.step .num{
  width:36px;height:36px;border-radius:50%;background:var(--panda-accent);color:#fff;
  display:flex;align-items:center;justify-content:center;margin:0 auto 14px;font-weight:700;font-size:15px;
}
.step h3{font-size:16px;margin-bottom:6px;}
.step p{font-size:13px;margin:0;}

/* ---------- Trust / why ---------- */
.why-grid{display:grid;grid-template-columns:1fr 1fr;gap:20px;}
.why-item{
  display:flex;gap:14px;padding:20px;background:var(--panda-card);border-radius:14px;border:1px solid var(--panda-border);
  transition:transform .2s ease, box-shadow .2s ease;
}
.why-item:hover{transform:translateY(-3px);box-shadow:var(--shadow);}
.why-item .mark{color:var(--panda-accent);font-size:18px;font-weight:800;}
.why-item h3{font-size:15px;margin:0 0 4px;}
.why-item p{margin:0;font-size:13px;}

/* ---------- Compare table ---------- */
.compare-wrap{overflow-x:auto;-webkit-overflow-scrolling:touch;}
.compare-table{
  width:100%;border-collapse:collapse;min-width:640px;
  background:var(--panda-card);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);
}
.compare-table th,.compare-table td{
  padding:16px 18px;text-align:left;font-size:14px;border-bottom:1px solid var(--panda-border);
}
.compare-table thead th{
  font-size:13px;font-weight:700;color:var(--panda-gray);background:rgba(255,255,255,.04);
}
.compare-table thead th.hl{color:var(--panda-accent);}
.compare-table td.hl{
  color:var(--panda-black);font-weight:600;background:rgba(47,111,237,.12);
}
.compare-table tbody tr:last-child td{border-bottom:none;}
.compare-table tbody tr{transition:background .15s ease;}
.compare-table tbody tr:hover{background:rgba(255,255,255,.04);}
.compare-table tbody tr:hover td.hl{background:rgba(47,111,237,.18);}
.compare-table td:first-child{color:var(--panda-gray);font-weight:600;white-space:nowrap;}

/* ---------- Lead form (申请体验) ---------- */
.lead{
  background:linear-gradient(135deg,rgba(47,111,237,.28),rgba(12,58,102,.9));
  color:#fff;border-radius:24px;border:1px solid var(--panda-border);
  padding:64px 40px;text-align:center;
}
.lead h2{color:#fff;}
.lead p.sub{color:rgba(255,255,255,.65);max-width:520px;margin:0 auto 32px;}
.lead-form{
  display:flex;gap:12px;max-width:480px;margin:0 auto;flex-wrap:wrap;justify-content:center;
}
.lead-form input{
  flex:1;min-width:220px;padding:14px 18px;border-radius:999px;border:none;font-size:15px;
  background:rgba(255,255,255,.1);color:#fff;
}
.lead-form input::placeholder{color:rgba(255,255,255,.45);}
.lead-form button{
  background:var(--panda-accent);color:#fff;border:none;padding:14px 28px;border-radius:999px;
  font-weight:700;font-size:15px;cursor:pointer;
}
.lead-form button:hover{background:var(--panda-accent-dark);}
.lead-note{font-size:12px;color:rgba(255,255,255,.4);margin-top:16px;}
.lead-success{display:none;color:#8fe3a0;font-weight:600;margin-top:16px;}
.lead-reset{display:inline-block;margin-top:8px;font-size:12px;font-weight:400;color:rgba(255,255,255,.6);text-decoration:underline;}
.lead-reset:hover{color:#fff;}
.lead-error{display:none;color:#ff9b9b;font-size:13px;margin:10px 0 0;}
.lead-error.show{display:block;}
.lead-form input.invalid{box-shadow:0 0 0 2px rgba(255,107,107,.6);}
.share-btn{
  display:inline-block;margin-top:18px;padding:9px 18px;border-radius:999px;
  background:rgba(255,255,255,.1);color:#fff;border:1px solid rgba(255,255,255,.2);
  font-size:13px;cursor:pointer;transition:background .2s ease;
}
.share-btn:hover{background:rgba(255,255,255,.2);}
.share-toast{
  display:none;margin:10px 0 0;font-size:12px;color:#8fe3a0;
}
.share-toast.show{display:block;}

/* ---------- FAQ ---------- */
.faq{max-width:760px;margin:0 auto;}
.faq-item{border-bottom:1px solid var(--panda-border);}
.faq-q{
  display:flex;align-items:center;justify-content:space-between;width:100%;
  background:none;border:none;cursor:pointer;text-align:left;padding:20px 0;
  font-size:16px;font-weight:600;color:var(--panda-black);font-family:inherit;
}
.faq-icon{
  flex:none;width:22px;height:22px;border-radius:50%;background:rgba(255,255,255,.08);color:var(--panda-gray);
  display:flex;align-items:center;justify-content:center;font-size:16px;line-height:1;transition:transform .2s ease, background .2s ease;
}
.faq-item.open .faq-q{color:var(--panda-accent);}
.faq-item.open .faq-icon{transform:rotate(45deg);background:rgba(47,111,237,.12);color:var(--panda-accent);}
.faq-a{max-height:0;overflow:hidden;transition:max-height .25s ease;}
.faq-a p{margin:0 0 20px;font-size:14px;}
.faq-item.open .faq-a{max-height:200px;}

/* ---------- Footer ---------- */
footer{border-top:1px solid var(--panda-border);padding:40px 0;}
footer .container{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:16px;}
footer .brand{font-size:14px;color:var(--panda-gray);}
footer .fl{display:flex;gap:24px;font-size:13px;color:var(--panda-gray);}
footer .fl a:hover{color:var(--panda-accent);}

@media (max-width:860px){
  .nav-links{display:none;}
  .nav-toggle{display:flex;}
  .nav-mobile{display:flex;}
  .hero h1{font-size:32px;}
  .stats{grid-template-columns:repeat(2,1fr);}
  .features-grid{grid-template-columns:1fr;}
  .demo-shots{grid-template-columns:1fr;}
  .steps{grid-template-columns:1fr 1fr;}
  .why-grid{grid-template-columns:1fr;}
  .lead{padding:40px 20px;}
}