/* ==========================================================================
   金口译言 · 全站共享样式（assets/site.css）
   ----------------------------------------------------------------------------
   这里只放每个页面都要用的东西：
     1. 设计变量        2. 基础排版        3. 布局与装饰（背景、进度条、进场动画）
     4. 通用组件        5. 导航            6. 页脚
   各页自己的布局（首页 Hero / 数据条 / 业务卡、产品页的 Hero / 功能分组 / 下载区、
   产品列表页的卡片墙）写在该页 <style> 里。

   → 改配色、按钮、导航、页脚，只改这一份文件即可，所有页面同时生效。
   ========================================================================== */

/* ==========================================================================
   1. 设计变量
   ========================================================================== */
:root{
  --bg:#04060d;
  --bg-soft:#080c17;
  --bg-card:rgba(14,20,36,.72);
  --cyan:#00e5ff;
  --blue:#3b82f6;
  --violet:#7c5cff;
  --text:#e9efff;
  --muted:#8b99b8;
  --line:rgba(122,152,222,.16);
  --line-strong:rgba(0,229,255,.45);
  --radius:16px;
  --nav-h:72px;
  --font:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  --mono:ui-monospace,SFMono-Regular,Menlo,Consolas,"Courier New",monospace;
  --shadow:0 24px 60px -20px rgba(0,0,0,.85);
}

/* ==========================================================================
   2. 基础排版
   ========================================================================== */
*,*::before,*::after{box-sizing:border-box}

html{
  scroll-behavior:smooth;
  scroll-padding-top:var(--nav-h);
  -webkit-text-size-adjust:100%;
}

body{
  margin:0;
  background:var(--bg);
  color:var(--text);
  font-family:var(--font);
  font-size:16px;
  line-height:1.75;
  letter-spacing:.01em;
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}

img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
button,input,textarea{font:inherit;color:inherit}
h1,h2,h3,h4{margin:0;line-height:1.25;font-weight:700;letter-spacing:-.01em}
p{margin:0}
ul{margin:0;padding:0;list-style:none}

::selection{background:rgba(0,229,255,.28);color:#fff}

::-webkit-scrollbar{width:10px;height:10px}
::-webkit-scrollbar-track{background:#05080f}
::-webkit-scrollbar-thumb{background:linear-gradient(180deg,#12405a,#1d2a4d);border-radius:99px}
::-webkit-scrollbar-thumb:hover{background:linear-gradient(180deg,#00e5ff,#7c5cff)}

/* ==========================================================================
   3. 布局与装饰
   ========================================================================== */
.wrap{width:min(1180px,100% - 48px);margin-inline:auto}

/* 背景网格 + 光晕 */
.bg-grid{
  position:fixed;inset:0;z-index:0;pointer-events:none;
  background-image:
    linear-gradient(rgba(120,160,255,.055) 1px,transparent 1px),
    linear-gradient(90deg,rgba(120,160,255,.055) 1px,transparent 1px);
  background-size:64px 64px;
  mask-image:radial-gradient(ellipse 80% 60% at 50% 0%,#000 20%,transparent 80%);
  -webkit-mask-image:radial-gradient(ellipse 80% 60% at 50% 0%,#000 20%,transparent 80%);
}
.bg-aurora{
  position:fixed;inset:0;z-index:0;pointer-events:none;overflow:hidden;
}
.bg-aurora i{
  position:absolute;display:block;border-radius:50%;filter:blur(90px);opacity:.5;
}
.bg-aurora i:nth-child(1){width:520px;height:520px;top:-180px;left:-120px;background:radial-gradient(circle,rgba(0,229,255,.55),transparent 70%)}
.bg-aurora i:nth-child(2){width:600px;height:600px;top:-260px;right:-160px;background:radial-gradient(circle,rgba(124,92,255,.5),transparent 70%)}
.bg-aurora i:nth-child(3){width:700px;height:700px;bottom:-420px;left:40%;background:radial-gradient(circle,rgba(59,130,246,.32),transparent 70%)}

/* 鼠标跟随光晕（首页 Hero 用） */
.cursor-glow{
  position:fixed;z-index:1;pointer-events:none;
  width:520px;height:520px;margin:-260px 0 0 -260px;
  background:radial-gradient(circle,rgba(0,229,255,.10),rgba(124,92,255,.06) 45%,transparent 70%);
  opacity:0;transition:opacity .5s ease;will-change:transform;
}
body.has-pointer .cursor-glow{opacity:1}

/* 顶部滚动进度条 */
.progress{
  position:fixed;top:0;left:0;height:2px;width:0;z-index:99;
  background:linear-gradient(90deg,var(--cyan),var(--violet));
  box-shadow:0 0 14px rgba(0,229,255,.8);
}

main,footer,header{position:relative;z-index:2}

/* 滚动进场 */
.reveal{opacity:0;transform:translateY(28px);transition:opacity .8s cubic-bezier(.2,.7,.3,1),transform .8s cubic-bezier(.2,.7,.3,1)}
.reveal.in{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .reveal{opacity:1!important;transform:none!important;transition:none}
  *{animation-duration:.001ms!important;animation-iteration-count:1!important}
}

/* ==========================================================================
   4. 通用组件
   ========================================================================== */

/* 标题小标签 */
.tag{
  display:inline-flex;align-items:center;gap:8px;
  font-family:var(--mono);font-size:12px;letter-spacing:.22em;text-transform:uppercase;
  color:var(--cyan);padding:6px 14px;border-radius:99px;
  border:1px solid rgba(0,229,255,.28);background:rgba(0,229,255,.06);
}
.tag::before{content:"";width:6px;height:6px;border-radius:50%;background:var(--cyan);box-shadow:0 0 10px var(--cyan);animation:pulse 2s infinite}
@keyframes pulse{0%,100%{opacity:1;transform:scale(1)}50%{opacity:.35;transform:scale(.7)}}

/* 区块与标题 */
.section{padding:120px 0;position:relative}
.section-head{max-width:760px;margin-bottom:60px}
.section-head h2{font-size:clamp(28px,4vw,42px);margin:20px 0 16px}
.section-head h2 em{font-style:normal;background:linear-gradient(100deg,var(--cyan),var(--violet));-webkit-background-clip:text;background-clip:text;color:transparent}
.section-head p{color:var(--muted)}
.section-head.center{margin-inline:auto;text-align:center}

/* 按钮 */
.btn{
  position:relative;display:inline-flex;align-items:center;justify-content:center;gap:10px;
  padding:14px 30px;border-radius:99px;border:1px solid transparent;
  font-weight:600;font-size:15px;cursor:pointer;overflow:hidden;
  transition:transform .3s cubic-bezier(.2,.8,.3,1),box-shadow .3s,border-color .3s,background .3s;
  white-space:nowrap;
}
.btn-primary{
  color:#031019;
  background:linear-gradient(100deg,#00e5ff,#5eead4 45%,#7c5cff);
  box-shadow:0 12px 34px -12px rgba(0,229,255,.75);
}
.btn-primary:hover{transform:translateY(-3px);box-shadow:0 20px 46px -12px rgba(0,229,255,.95)}
.btn-ghost{
  color:var(--text);border-color:var(--line);background:rgba(255,255,255,.02);
  backdrop-filter:blur(8px);
}
.btn-ghost:hover{transform:translateY(-3px);border-color:var(--line-strong);background:rgba(0,229,255,.07)}
.btn i{font-style:normal;transition:transform .3s}
.btn:hover i{transform:translateX(4px)}

/* 卡片通用 */
.card{
  position:relative;border-radius:var(--radius);
  border:1px solid var(--line);background:var(--bg-card);
  backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);
  overflow:hidden;isolation:isolate;
  transition:transform .45s cubic-bezier(.2,.8,.3,1),border-color .45s,box-shadow .45s;
}
.card::after{
  content:"";position:absolute;inset:0;z-index:-1;opacity:0;transition:opacity .45s;
  background:radial-gradient(420px circle at var(--mx,50%) var(--my,50%),rgba(0,229,255,.14),transparent 62%);
}
.card:hover{transform:translateY(-8px);border-color:rgba(0,229,255,.35);box-shadow:var(--shadow)}
.card:hover::after{opacity:1}

/* ==========================================================================
   5. 导航
   ========================================================================== */
.nav{
  position:fixed;top:0;left:0;right:0;z-index:50;height:var(--nav-h);
  display:flex;align-items:center;
  border-bottom:1px solid transparent;
  transition:background .4s,border-color .4s,backdrop-filter .4s,height .4s;
}
.nav.scrolled{
  height:60px;
  background:rgba(4,7,15,.82);
  border-bottom-color:var(--line);
  backdrop-filter:blur(18px);-webkit-backdrop-filter:blur(18px);
}
.nav .wrap{display:flex;align-items:center;justify-content:space-between;gap:24px}

.logo{display:flex;align-items:center;gap:12px;flex-shrink:0}
.logo-mark{
  width:38px;height:38px;border-radius:11px;display:grid;place-items:center;
  background:linear-gradient(135deg,rgba(0,229,255,.18),rgba(124,92,255,.24));
  border:1px solid rgba(0,229,255,.4);
  font-family:var(--mono);font-weight:700;font-size:15px;letter-spacing:.02em;
  color:#bff4ff;box-shadow:0 0 22px -6px rgba(0,229,255,.75);
}
.logo-text{display:flex;flex-direction:column;line-height:1.15}
.logo-text b{font-size:17px;letter-spacing:.04em}
.logo-text small{font-family:var(--mono);font-size:9.5px;letter-spacing:.22em;color:var(--muted);text-transform:uppercase}

.nav-links{display:flex;align-items:center;gap:6px}
.nav-links a{
  position:relative;padding:9px 16px;border-radius:10px;font-size:14.5px;color:#c3cde4;
  transition:color .28s,background .28s;
}
.nav-links a::after{
  content:"";position:absolute;left:16px;right:16px;bottom:4px;height:1.5px;
  background:linear-gradient(90deg,var(--cyan),var(--violet));
  transform:scaleX(0);transform-origin:left;transition:transform .32s cubic-bezier(.2,.8,.3,1);
}
.nav-links a:hover{color:#fff;background:rgba(255,255,255,.04)}
.nav-links a:hover::after,.nav-links a.active::after{transform:scaleX(1)}
.nav-links a.active{color:#fff}

.nav-cta{padding:11px 22px;font-size:14px}

.burger{
  display:none;width:44px;height:44px;border-radius:12px;
  border:1px solid var(--line);background:rgba(255,255,255,.03);
  cursor:pointer;position:relative;
}
.burger span{
  position:absolute;left:12px;right:12px;height:1.8px;border-radius:2px;background:var(--text);
  transition:transform .35s cubic-bezier(.2,.8,.3,1),opacity .25s;
}
.burger span:nth-child(1){top:15px}
.burger span:nth-child(2){top:21px}
.burger span:nth-child(3){top:27px}
.nav.open .burger span:nth-child(1){transform:translateY(6px) rotate(45deg)}
.nav.open .burger span:nth-child(2){opacity:0}
.nav.open .burger span:nth-child(3){transform:translateY(-6px) rotate(-45deg)}

@media (max-width:980px){
  .nav-cta{display:none}
  .burger{display:block}
  .nav-links{
    position:fixed;inset:var(--nav-h) 0 auto 0;
    flex-direction:column;align-items:stretch;gap:4px;
    padding:18px 24px 30px;
    background:rgba(6,10,20,.99);
    border-bottom:1px solid var(--line);
    backdrop-filter:blur(20px);-webkit-backdrop-filter:blur(20px);
    transform:translateY(-14px);opacity:0;pointer-events:none;
    transition:transform .35s cubic-bezier(.2,.8,.3,1),opacity .3s;
    max-height:calc(100vh - var(--nav-h));overflow-y:auto;
  }
  .nav.open .nav-links{transform:none;opacity:1;pointer-events:auto}
  /* 导航栏收起后高度变为 60px，菜单需跟着上移，否则会漏出一条缝隙 */
  .nav.scrolled .nav-links{inset-block-start:60px}
  .nav-links a{padding:14px 16px;font-size:16px}
  .nav-links a::after{display:none}
}

/* ==========================================================================
   6. 页脚
   ========================================================================== */
footer{
  border-top:1px solid var(--line);background:linear-gradient(180deg,rgba(8,12,23,.4),rgba(3,5,10,1));
  padding:74px 0 34px;
}
.foot-top{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:40px;margin-bottom:54px}
@media (max-width:900px){.foot-top{grid-template-columns:1fr 1fr;gap:34px}}
@media (max-width:560px){.foot-top{grid-template-columns:1fr}}
.foot-brand p{color:var(--muted);font-size:14px;margin-top:18px;max-width:300px}
.foot-col h5{
  font-size:13px;letter-spacing:.16em;text-transform:uppercase;color:#cdd9f0;
  margin:0 0 18px;font-family:var(--mono);font-weight:600;
}
.foot-col li{margin-bottom:11px}
.foot-col a{color:var(--muted);font-size:14px;transition:color .28s,padding-left .28s}
.foot-col a:hover{color:var(--cyan);padding-left:5px}

.foot-bottom{
  border-top:1px solid var(--line);padding-top:26px;
  display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap;
  font-size:13px;color:#6c7a99;
}
.foot-bottom .links{display:flex;gap:22px;flex-wrap:wrap;align-items:center}
.foot-bottom a{color:#8a99b8;transition:color .28s}
.foot-bottom a:hover{color:var(--cyan)}
.beian{display:inline-flex;align-items:center;gap:8px}
.beian::before{
  content:"";width:5px;height:5px;border-radius:50%;
  background:linear-gradient(135deg,var(--cyan),var(--violet));
}