/* ============================================================
   CF Download 官网 · atlas.css — 航图 ATLAS 模板覆盖层
   在各页内嵌 <style> 之后加载,同特异性下优先生效;
   仅改观感,所有功能钩子(表单/下单/下载链接)不受影响。
   设计令牌与资源站一致:官网蓝 #1B66E0 + #F7F8FA。
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@300;400;500;600;700&family=Noto+Serif+SC:wght@400;600;700;900&family=Noto+Sans+SC:wght@300;400;500;700&family=JetBrains+Mono:wght@400;500&display=swap');

:root{
  --atlas-serif:'Noto Serif SC','Songti SC','SimSun',serif;
  --atlas-disp:'Space Grotesk','Noto Sans SC','PingFang SC','Microsoft YaHei',sans-serif;
  --atlas-mono:'JetBrains Mono',ui-monospace,'Cascadia Mono',Consolas,monospace;
  --atlas-ease:cubic-bezier(.22,1,.36,1);
  --atlas-line:rgba(16,24,40,.12);
  --atlas-line-strong:rgba(16,24,40,.3);
  --atlas-bg2:#EEF1F6;
}

/* ---------- base ---------- */
body{
  font-weight:300;line-height:1.7;
  background:var(--bg);color:var(--ink);
}
body::after{
  content:"";position:fixed;inset:-50%;pointer-events:none;z-index:9999;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='240' height='240'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.05'/%3E%3C/svg%3E");
  animation:atlas-grain 9s steps(6) infinite;
}
@keyframes atlas-grain{
  0%,100%{transform:translate(0,0)}20%{transform:translate(-6%,4%)}40%{transform:translate(4%,-8%)}
  60%{transform:translate(-3%,7%)}80%{transform:translate(7%,-3%)}
}
::selection{background:var(--accent);color:#fff}
a{text-decoration:none}
::-webkit-scrollbar{width:10px;height:10px}
::-webkit-scrollbar-track{background:transparent}
::-webkit-scrollbar-thumb{background:var(--atlas-line-strong);border-radius:999px;border:2px solid var(--bg)}
::-webkit-scrollbar-thumb:hover{background:#98A2B3}
::-webkit-scrollbar-corner{background:transparent}

/* cursor / progress(atlas-extras 注入) */
.cursor,.cursor-dot{position:fixed;top:0;left:0;pointer-events:none;z-index:10000;border-radius:50%}
.cursor{width:36px;height:36px;border:1px solid var(--accent);transition:opacity .3s}
.cursor-dot{width:5px;height:5px;background:var(--accent)}
@media(hover:none){.cursor,.cursor-dot{display:none}}
.progress{position:fixed;top:0;left:0;height:2px;background:var(--accent);width:0;z-index:1001;transition:width .1s linear}

/* ---------- 顶栏:品牌蓝渐变 ---------- */
.topnav{
  background:linear-gradient(135deg,#0F4CB8 0%,#1B66E0 62%,#2F7AE8 100%);
  border-bottom:1px solid rgba(255,255,255,.14);
}
.topnav.scrolled{background:rgba(13,62,153,.94);backdrop-filter:blur(14px)}
.topnav-in{height:64px}
.brand{color:#fff;font-family:var(--atlas-disp);letter-spacing:.1em}
.topnav nav a{color:rgba(255,255,255,.85);font-family:var(--atlas-disp);font-size:12.5px;letter-spacing:.12em;font-weight:500;position:relative}
.topnav nav a:hover{color:#fff;text-decoration:none}
.topnav nav a::after{content:"";position:absolute;left:0;bottom:-4px;width:0;height:1px;background:#fff;transition:width .35s var(--atlas-ease)}
.topnav nav a:hover::after{width:100%}
.topnav nav a:not(.nav-cta):hover::after{width:100%}
.nav-cta{
  background:#fff!important;color:var(--accent)!important;
  border-radius:100px!important;padding:8px 20px!important;font-weight:600;
  transition:transform .3s var(--atlas-ease),box-shadow .3s!important;
}
.nav-cta:hover{transform:translateY(-2px);box-shadow:0 8px 24px rgba(0,20,60,.35)}
.nav-cta::after{display:none}
.nav-toggle{background:transparent;border-color:rgba(255,255,255,.55)!important;color:#fff!important}

/* ---------- hero ---------- */
.hero{padding:110px 0 0}
.hero::before{
  background:
    radial-gradient(760px 340px at 84% -10%, rgba(27,102,224,.16), transparent 62%),
    linear-gradient(180deg,#FFFFFF 0%, var(--bg) 100%);
}
.hero .wrap{position:relative}
.hero .wrap::before{
  content:"";position:absolute;inset:-40px -100vw 0 -60px;pointer-events:none;z-index:-1;
  background-image:linear-gradient(var(--atlas-line) 1px,transparent 1px),linear-gradient(90deg,var(--atlas-line) 1px,transparent 1px);
  background-size:72px 72px;opacity:.3;
  mask-image:radial-gradient(ellipse at 26% 34%,black 16%,transparent 72%);
  -webkit-mask-image:radial-gradient(ellipse at 26% 34%,black 16%,transparent 72%);
}
.kicker{
  font-family:var(--atlas-mono);font-size:12px;letter-spacing:.22em;
  color:var(--accent);background:transparent!important;border:none!important;
  padding:0!important;margin-bottom:24px;text-transform:uppercase;
  display:inline-flex;align-items:center;gap:14px;
}
.kicker::before{content:"";width:44px;height:1px;background:var(--accent)}
.hero h1{
  font-family:var(--atlas-serif);font-weight:900!important;
  font-size:clamp(38px,5.6vw,76px)!important;line-height:1.1!important;letter-spacing:.01em;
}
.hero h1 .blue{color:var(--accent)}
.hero .lede{font-size:15.5px;font-weight:300}
.hero-actions{margin-top:30px}
.btn{
  border-radius:100px!important;font-family:var(--atlas-disp);
  font-weight:500!important;font-size:13.5px!important;letter-spacing:.1em;
  padding:14px 28px!important;transition:transform .3s var(--atlas-ease),box-shadow .3s,background .3s,color .3s,border-color .3s;
}
.btn-primary{background:var(--accent);color:#fff}
.btn-primary:hover{background:var(--accent);transform:translateY(-2px);box-shadow:0 10px 30px rgba(27,102,224,.32)}
.btn-ghost{background:transparent;border-color:var(--atlas-line-strong)}
.btn-ghost:hover{border-color:var(--accent);color:var(--accent);background:transparent;transform:translateY(-2px)}
.hero-note{font-family:var(--atlas-mono);font-size:11.5px;letter-spacing:.04em}

/* ---------- 指标条 ---------- */
.metric b{font-family:var(--atlas-serif);font-weight:900;font-size:30px;color:var(--accent)}
.metric{padding:22px 20px}
.metric span{font-family:var(--atlas-mono);font-size:11px;letter-spacing:.14em}

/* ---------- 章节标题 ---------- */
h2{font-family:var(--atlas-serif);font-weight:900;letter-spacing:.005em}
.sec-head .eyebrow{
  color:var(--accent);display:inline-flex;align-items:center;gap:12px;
  font-size:12px;letter-spacing:.3em;margin-bottom:12px;
}
.sec-head .eyebrow::before{content:"";width:44px;height:1px;background:var(--accent)}
.sec-head h2{font-size:clamp(26px,3.6vw,44px);line-height:1.18;margin:0 0 12px}
.page-head h1,.page-title{font-family:var(--atlas-serif);font-weight:900;font-size:clamp(30px,4.6vw,56px);line-height:1.15}

/* ---------- 卡片:1px 缝合平面风 ---------- */
.feat-grid,.feat-grid.r2{gap:1px;background:var(--atlas-line);border:1px solid var(--atlas-line)}
.feat-grid.r2{margin-top:1px}
.feat,.panel,.lic-card,.type-card{
  background:var(--bg);border:none;border-radius:0;
  transition:background .4s;position:relative;
}
.feat:hover,.panel:hover,.lic-card:hover,.type-card:hover,.type-card.sel{background:var(--atlas-bg2);box-shadow:none;border-color:transparent}
.feat::after,.panel::after,.lic-card::after{
  content:"";position:absolute;left:0;bottom:0;height:2px;width:0;background:var(--accent);transition:width .5s var(--atlas-ease);
}
.feat:hover::after,.panel:hover::after,.lic-card:hover::after{width:100%}
.feat h3,.panel h3{font-family:var(--atlas-disp);font-weight:600}
.feat .ficon{border-radius:0;width:40px;height:40px}
.feat .tagline{letter-spacing:.1em}
.duo{gap:1px;background:var(--atlas-line);border:1px solid var(--atlas-line)}
.panel{padding:32px}
.lic{gap:1px;background:var(--atlas-line);border:1px solid var(--atlas-line)}
.lic-card{padding:34px 30px}
.lic-card .price{font-family:var(--atlas-disp);font-weight:700}
.steps li::before{border-radius:0;background:transparent;color:var(--accent);border:none;font-size:15px;padding-top:2px}
.cmp-panel{border-radius:0}

/* ---------- AI 深色条 ---------- */
.ai-band{border-radius:0;padding:56px clamp(28px,4vw,56px) 0}
.ai-cards{gap:1px;background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.08)}
.ai-card{border-radius:0;border:none;background:rgba(12,18,32,.55);transition:background .4s}
.ai-card:hover{background:var(--night-surface)}

/* ---------- 购买页 ---------- */
.type-grid{gap:1px;background:var(--atlas-line);border:1px solid var(--atlas-line)}
.type-card{padding:26px 24px;cursor:pointer}
.type-card .p{font-family:var(--atlas-disp);font-weight:700;font-size:28px}
.type-card .p small{font-weight:400;font-size:12px;color:#98A2B3}
.type-card.sel{outline:2px solid var(--accent);outline-offset:-2px;background:var(--accent-soft,#EAF1FD)}
.field input{
  border-radius:2px;border:1px solid var(--atlas-line-strong);
  padding:12px 16px;font-size:14px;outline:none;transition:border-color .3s;background:transparent;
}
.field input:focus{border-color:var(--accent)}
.pay-card{background:var(--bg);border:none;border-radius:0}
.pay-qr{border-radius:0}
.ok-box{border-radius:0}
h1,h2,h3{letter-spacing:.005em}

/* ---------- 收尾 CTA / footer ---------- */
.closing{border-radius:0}
footer{font-family:var(--atlas-disp)}

/* ---------- 回到顶部(atlas-extras 注入) ---------- */
#top-btn{
  position:fixed;bottom:26px;right:26px;width:46px;height:46px;border-radius:50%;
  border:1px solid var(--atlas-line-strong);background:rgba(247,248,250,.75);backdrop-filter:blur(10px);
  color:var(--ink);cursor:pointer;opacity:0;pointer-events:none;transition:.4s;z-index:900;display:grid;place-items:center;
}
#top-btn.show{opacity:1;pointer-events:auto}
#top-btn:hover{border-color:var(--accent);color:var(--accent);transform:translateY(-3px)}

/* ---------- 跑马灯 ---------- */
.ticker{border-top:1px solid var(--atlas-line);border-bottom:1px solid var(--atlas-line);overflow:hidden;padding:16px 0;background:var(--atlas-bg2)}
.ticker-track{display:flex;white-space:nowrap;animation:atlas-tick 38s linear infinite;width:max-content}
.ticker:hover .ticker-track{animation-play-state:paused}
.ticker span{font-family:var(--atlas-disp);font-size:13px;letter-spacing:.2em;color:#98A2B3;padding:0 26px;position:relative}
.ticker span::after{content:"◆";position:absolute;right:-6px;color:var(--accent);font-size:8px;top:5px}
@keyframes atlas-tick{to{transform:translateX(-50%)}}

/* ---------- reduced motion ---------- */
@media(prefers-reduced-motion:reduce){
  body::after{animation:none}
  html{scroll-behavior:auto}
  .ticker-track{animation-duration:120s}
  .btn,.feat,.panel,.lic-card,.type-card{transition:none}
}