/* ============================================================
   AI 智能助手平台 — 全局样式
   设计语言：Bento 科技风 · 深色沉浸 + 翡翠绿 AI 信号 + 科技蓝转化
   ============================================================ */

:root{
  /* 色彩令牌（提亮：深蓝紫科技渐变底色，告别纯黑） */
  --bg:#0E1126;           /* 深靛蓝紫，比纯黑更有科技空气感 */
  --bg2:#161B35;          /* 次级卡片底色 */
  --bg3:#1B2147;          /* 浮层/高亮区块 */
  --primary:#10B981;      /* 翡翠绿 */
  --primary-soft:rgba(16,185,129,.16);
  --accent:#3B82F6;       /* 科技蓝 */
  --accent-soft:rgba(59,130,246,.18);
  --purple:#8B5CF6;
  --purple-soft:rgba(139,92,246,.18);
  --text:#EEF2FF;         /* 微微偏冷白，更通透 */
  --text-dim:#A3ADD0;
  --ink:#0F172A;
  --ink-dim:#475569;
  --border:#232B52;
  --border-soft:rgba(35,43,82,.7);

  /* 半径 / 动效 */
  --r:12px;
  --r-lg:20px;
  --ease:cubic-bezier(.4,0,.2,1);
  --t:300ms;
  --t-fast:200ms;

  /* 字体 */
  --sans:"Inter","PingFang SC","Microsoft YaHei","WenQuanYi Micro Hei",system-ui,sans-serif;
}

*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  font-family:var(--sans);
  /* 深蓝紫科技渐变底色 + 细微动态网格 */
  background:var(--bg);
  background-image:radial-gradient(1200px 700px at 82% -10%,rgba(59,130,246,.18),transparent 60%),
                   radial-gradient(900px 600px at -10% 8%,rgba(139,92,246,.14),transparent 55%),
                   radial-gradient(700px 500px at 50% 100%,rgba(16,185,129,.08),transparent 55%),
                   linear-gradient(180deg,#0E1126 0%,#0F122B 45%,#0E1126 100%);
  background-attachment:fixed;
  color:var(--text);
  font-size:16px;
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
/* 全局细微网格层（固定铺满，营造科技感而不抢主体） */
body::before{
  content:"";position:fixed;inset:0;z-index:0;pointer-events:none;
  background-image:linear-gradient(rgba(139,92,246,.05) 1px,transparent 1px),
                  linear-gradient(90deg,rgba(59,130,246,.05) 1px,transparent 1px);
  background-size:56px 56px;mask-image:radial-gradient(ellipse 90% 70% at 50% 30%,#000 40%,transparent 100%);
  -webkit-mask-image:radial-gradient(ellipse 90% 70% at 50% 30%,#000 40%,transparent 100%);
}
#page-root{position:relative;z-index:1}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
button{font-family:inherit;cursor:pointer;border:none;background:none;color:inherit}
ul{list-style:none}

/* ---------- 工具类 ---------- */
.container{max-width:1180px;margin:0 auto;padding:0 24px}
.section{padding:88px 0}
.section-head{text-align:center;max-width:720px;margin:0 auto 52px}
.eyebrow{
  display:inline-block;font-size:13px;font-weight:600;letter-spacing:.08em;
  color:var(--primary);text-transform:uppercase;margin-bottom:14px;
}
h1,h2,h3{font-weight:700;line-height:1.25;color:var(--text)}
h1{font-size:48px;letter-spacing:-.02em}
h2{font-size:36px;letter-spacing:-.01em}
h3{font-size:24px}
p{color:var(--text-dim)}
.muted{color:var(--text-dim)}

/* 关键词绿色高亮 */
.hl{color:var(--primary);position:relative;white-space:nowrap}
.hl::after{content:"";position:absolute;left:0;right:0;bottom:2px;height:8px;background:var(--primary-soft);z-index:-1;border-radius:4px}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:13px 26px;border-radius:var(--r);font-weight:600;font-size:15px;
  transition:transform var(--t-fast) ease-out,background var(--t-fast) ease-out,box-shadow var(--t-fast) ease-out,border-color var(--t-fast);
  border:1px solid transparent;white-space:nowrap;
}
.btn-primary{background:var(--accent);color:#fff;box-shadow:0 8px 24px rgba(59,130,246,.28)}
.btn-primary:hover{background:#2563EB;transform:translateY(-2px);box-shadow:0 14px 30px rgba(59,130,246,.36)}
.btn-outline{background:transparent;color:var(--text);border-color:var(--border)}
.btn-outline:hover{border-color:var(--primary);color:var(--primary);transform:translateY(-2px)}
.btn-ghost{color:var(--text-dim);padding:8px 4px}
.btn-ghost:hover{color:var(--primary)}
.btn-block{width:100%}

/* ---------- 导航 ---------- */
.header{
  position:fixed;top:0;left:0;right:0;z-index:50;
  background:rgba(11,11,20,.72);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);
  border-bottom:1px solid var(--border-soft);transition:background var(--t);
}
.nav{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;letter-spacing:-.01em}
.brand-mark{
  width:32px;height:32px;border-radius:9px;
  background:linear-gradient(135deg,var(--primary),var(--accent));
  display:grid;place-items:center;color:#fff;font-size:17px;font-weight:800;
  box-shadow:0 6px 18px rgba(16,185,129,.3);
}
.menu{display:flex;align-items:center;gap:6px}
.menu a{font-size:14px;color:var(--text-dim);padding:8px 12px;border-radius:8px;position:relative;transition:color var(--t-fast)}
.menu a:hover{color:var(--text)}
.menu a:hover::after{content:"";position:absolute;left:12px;right:12px;bottom:2px;height:2px;background:var(--primary);border-radius:2px}
.nav-cta{display:flex;align-items:center;gap:10px}
.hamburger{display:none;width:40px;height:40px;border-radius:10px;border:1px solid var(--border);flex-direction:column;gap:5px;align-items:center;justify-content:center}
.hamburger span{width:18px;height:2px;background:var(--text);border-radius:2px;transition:transform var(--t),opacity var(--t)}
.hamburger.open span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.hamburger.open span:nth-child(2){opacity:0}
.hamburger.open span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}

/* ---------- 卡片 ---------- */
.card{background:linear-gradient(180deg,rgba(27,33,71,.72),rgba(22,27,53,.72));border:1px solid var(--border);border-radius:var(--r-lg);padding:28px;transition:border-color var(--t) ease-out,transform var(--t) ease-out,box-shadow var(--t) ease-out,background var(--t) ease-out;backdrop-filter:blur(6px);-webkit-backdrop-filter:blur(6px)}
.card:hover{border-color:rgba(16,185,129,.55);transform:translateY(-4px);box-shadow:0 20px 50px rgba(8,11,30,.45),0 0 0 1px rgba(16,185,129,.12) inset}

/* ---------- 徽标 ---------- */
.tag{display:inline-flex;align-items:center;gap:6px;font-size:12px;font-weight:600;color:var(--text-dim);background:var(--bg2);border:1px solid var(--border);padding:5px 11px;border-radius:999px}
.dot{width:7px;height:7px;border-radius:50%;background:var(--primary);box-shadow:0 0 0 4px var(--primary-soft)}

/* ---------- 页脚 ---------- */
.footer{background:#0A0D20;border-top:1px solid var(--border);padding:64px 0 28px;margin-top:40px;position:relative;z-index:1}
.foot-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:40px;margin-bottom:44px}
.foot-col h4{font-size:14px;color:var(--text);margin-bottom:16px;font-weight:700}
.foot-col ul{display:flex;flex-direction:column;gap:10px}
.foot-col a{color:var(--text-dim);font-size:14px;transition:color var(--t-fast)}
.foot-col a:hover{color:var(--primary)}
.foot-about p{font-size:14px;margin-top:12px;max-width:320px}
.foot-bottom{display:flex;align-items:center;justify-content:space-between;border-top:1px solid var(--border);padding-top:22px;font-size:13px;color:var(--text-dim)}
.social{display:flex;gap:10px}
.social a{width:36px;height:36px;border-radius:9px;border:1px solid var(--border);display:grid;place-items:center;color:var(--text-dim);transition:all var(--t-fast)}
.social a:hover{border-color:var(--primary);color:var(--primary);transform:translateY(-2px)}

/* ---------- 滚动入场动画 ---------- */
.reveal{opacity:0;transform:translateY(30px);transition:opacity .5s var(--ease),transform .5s var(--ease)}
.reveal.in{opacity:1;transform:none}

/* ---------- 响应式 ---------- */
@media(max-width:900px){
  h1{font-size:38px}h2{font-size:30px}
  .section{padding:64px 0}
  .menu{position:fixed;top:68px;left:0;right:0;flex-direction:column;align-items:stretch;gap:4px;padding:18px 24px;background:rgba(11,11,20,.96);border-bottom:1px solid var(--border);transform:translateY(-12px);opacity:0;pointer-events:none;transition:all var(--t)}
  .menu.open{transform:none;opacity:1;pointer-events:auto}
  .menu a{padding:12px 8px;font-size:16px}
  .hamburger{display:flex}
  .nav-cta .btn-outline{display:none}
  .foot-grid{grid-template-columns:1fr 1fr;gap:32px}
}
@media(max-width:640px){
  h1{font-size:32px}h2{font-size:26px}h3{font-size:20px}
  .container{padding:0 18px}
  .section{padding:52px 0}
  .foot-grid{grid-template-columns:1fr}
  .foot-bottom{flex-direction:column;gap:12px;text-align:center}
}