/* ===== 深色科技风设计令牌 ===== */
:root{
  --bg:           #0a1628;   /* 深藏青底 */
  --bg-alt:       #0d1a2f;   /* 次级背景 */
  --surface:      #122039;   /* 卡片表面 */
  --surface-hi:   #182a4a;   /* 卡片 hover */
  --text:         #e8eef7;   /* 冷白主文字（非纯白，护眼）*/
  --text-soft:    #b8c4d8;
  --text-mute:    #7588a3;
  --brand:        #00d9b2;   /* 荧光青绿主色 */
  --brand-soft:   rgba(0,217,178,.18);
  --accent:       #6366f1;   /* 紫蓝点缀 */
  --accent-2:     #a855f7;   /* 渐变收尾色 */
  --line:         rgba(255,255,255,.08);
  --line-strong:  rgba(255,255,255,.14);
  --glow:         0 0 24px rgba(0,217,178,.35);
  --shadow:       0 8px 32px rgba(0,0,0,.35);
  --radius:       14px;
  --radius-sm:    8px;
  --maxw:         1180px;
}

*,*::before,*::after{ box-sizing:border-box; }
html{ scroll-behavior:smooth; -webkit-text-size-adjust:100%; }
body{
  margin:0;
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei",
               "Segoe UI", "Inter", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size:16px;
  line-height:1.7;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  /* 全局深色网格 + 微光斑 */
  background-image:
    radial-gradient(1200px 600px at 80% -10%, rgba(0,217,178,.10), transparent 60%),
    radial-gradient(900px 500px at -10% 20%, rgba(99,102,241,.10), transparent 60%),
    linear-gradient(rgba(255,255,255,.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.025) 1px, transparent 1px);
  background-size: auto, auto, 56px 56px, 56px 56px;
  background-position: 0 0, 0 0, -1px -1px, -1px -1px;
}
img,svg{ display:block; max-width:100%; }
a{ color: var(--brand); text-decoration:none; transition: color .2s ease; }
a:hover{ color:#5af0d0; }
h1,h2,h3{ color: var(--text); font-weight:700; letter-spacing:.01em; line-height:1.25; }
h1{ font-size: clamp(2rem, 4vw + 1rem, 3.4rem); margin:0 0 .8em; }
h2{ font-size: clamp(1.5rem, 1.5vw + 1rem, 2.2rem); margin:0 0 .6em; }
h3{ font-size:1.15rem; margin:0 0 .5em; }
p{ margin:0 0 1em; color: var(--text-soft); }

.container{
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 24px;
}

/* ===== 头部 / 导航 ===== */
.site-header{
  position: sticky; top:0; z-index:50;
  background: rgba(10,22,40,.7);
  backdrop-filter: saturate(140%) blur(14px);
  -webkit-backdrop-filter: saturate(140%) blur(14px);
  border-bottom: 1px solid var(--line);
}
.nav-wrap{
  display:flex; align-items:center; justify-content:space-between;
  height:68px;
}
.brand{
  display:flex; align-items:center; gap:12px;
  color: var(--text);
}
.brand:hover{ color: var(--text); }
.brand-mark{
  display:inline-flex; align-items:center; justify-content:center;
  width:38px; height:38px; border-radius:10px;
  background: linear-gradient(135deg, var(--brand), var(--accent));
  color:#0a1628;
  font-weight:800; font-size:1.05rem;
  box-shadow: var(--glow);
}
.brand-text{ display:flex; flex-direction:column; line-height:1.1; }
.brand-cn{ font-weight:700; font-size:1rem; }
.brand-en{ font-size:.72rem; color: var(--text-mute); letter-spacing:.04em; }

.nav{ display:flex; gap:28px; align-items:center; }
.nav a{
  color: var(--text-soft);
  font-size:.95rem;
  padding:6px 2px;
  position: relative;
}
.nav a::after{
  content:"";
  position:absolute; left:0; right:0; bottom:-4px;
  height:2px;
  background: linear-gradient(90deg, var(--brand), var(--accent));
  border-radius:2px;
  transform: scaleX(0);
  transform-origin: center;
  transition: transform .25s ease;
}
.nav a:hover{ color: var(--text); }
.nav a:hover::after{ transform: scaleX(1); }

.nav-toggle{
  display:none;
  background:transparent; border:0;
  width:40px; height:40px;
  padding:0; cursor:pointer;
  flex-direction:column; justify-content:center; gap:5px;
}
.nav-toggle span{
  display:block; height:2px; width:22px; margin:0 auto;
  background: var(--text); border-radius:2px;
}

/* ===== Hero ===== */
.hero{
  position:relative;
  padding: clamp(80px, 14vw, 160px) 0 clamp(72px, 10vw, 120px);
  overflow:hidden;
}
.hero::before{
  /* 顶部弧形光晕 */
  content:"";
  position:absolute;
  top:-200px; left:50%;
  width:1100px; height:600px;
  transform: translateX(-50%);
  background: radial-gradient(ellipse at center, rgba(0,217,178,.18), transparent 65%);
  pointer-events:none;
  filter: blur(20px);
}
.hero-eyebrow{
  display:inline-flex; align-items:center; gap:10px;
  padding: 6px 14px;
  border-radius: 999px;
  background: var(--brand-soft);
  color: var(--brand);
  font-size:.78rem;
  letter-spacing:.18em;
  text-transform: uppercase;
  font-weight:600;
  margin:0 0 1.4em;
  border: 1px solid rgba(0,217,178,.3);
}
.hero-eyebrow::before{
  content:""; width:6px; height:6px; border-radius:50%;
  background: var(--brand);
  box-shadow: 0 0 8px var(--brand);
}
.hero h1 .grad{
  background: linear-gradient(120deg, var(--brand), var(--accent) 60%, var(--accent-2));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero-sub{
  font-size: clamp(1rem, .4vw + .95rem, 1.18rem);
  max-width: 680px;
  color: var(--text-soft);
  margin-bottom: 2.2em;
}
.hero-actions{ display:flex; gap:14px; flex-wrap:wrap; }

/* ===== 按钮 ===== */
.btn{
  display:inline-block;
  padding: 13px 26px;
  border-radius: 10px;
  font-size:.95rem;
  font-weight:600;
  letter-spacing:.02em;
  transition: transform .15s ease, background .2s ease, box-shadow .2s ease, border-color .2s ease;
  border:1px solid transparent;
  cursor:pointer;
}
.btn-primary{
  background: linear-gradient(120deg, var(--brand), var(--accent));
  color: #0a1628;
  box-shadow: 0 0 0 rgba(0,217,178,0);
}
.btn-primary:hover{
  color: #0a1628;
  transform: translateY(-2px);
  box-shadow: 0 10px 28px rgba(0,217,178,.32);
}
.btn-ghost{
  background: transparent;
  color: var(--text);
  border-color: rgba(255,255,255,.18);
}
.btn-ghost:hover{
  background: rgba(255,255,255,.06);
  border-color: var(--brand);
  color: var(--brand);
}

/* ===== 区块 ===== */
.section{ padding: clamp(64px, 10vw, 112px) 0; position:relative; }
.section-alt{
  background:
    linear-gradient(180deg, rgba(255,255,255,.012), rgba(255,255,255,0)),
    var(--bg-alt);
  border-top:1px solid var(--line);
  border-bottom:1px solid var(--line);
}
.section-head{
  max-width: 720px;
  margin: 0 auto 56px;
  text-align:center;
}
.eyebrow{
  display:inline-block;
  color: var(--brand);
  font-size:.78rem;
  letter-spacing:.2em;
  text-transform:uppercase;
  font-weight:600;
  margin: 0 0 .8em;
}
.lead{ color: var(--text-soft); font-size:1.05rem; }

/* ===== 网格 ===== */
.grid{ display:grid; gap:20px; }
.grid-2{ grid-template-columns: repeat(2, minmax(0,1fr)); }
.grid-4{ grid-template-columns: repeat(4, minmax(0,1fr)); }

/* ===== 服务卡（玻璃态 + hover 发光）===== */
.card{
  position: relative;
  background: linear-gradient(180deg, rgba(255,255,255,.04), rgba(255,255,255,.02));
  border:1px solid var(--line);
  border-radius: var(--radius);
  padding: 28px 24px;
  transition: transform .25s ease, border-color .25s ease, box-shadow .25s ease, background .25s ease;
  overflow: hidden;
}
.card::before{
  content:"";
  position:absolute; inset:0;
  border-radius: var(--radius);
  padding:1px;
  background: linear-gradient(135deg, transparent, var(--brand), transparent 60%);
  -webkit-mask:
     linear-gradient(#000 0 0) content-box,
     linear-gradient(#000 0 0);
  -webkit-mask-composite: xor;
          mask-composite: exclude;
  opacity:0;
  transition: opacity .25s ease;
  pointer-events:none;
}
.card:hover{
  transform: translateY(-4px);
  background: linear-gradient(180deg, rgba(0,217,178,.06), rgba(255,255,255,.02));
  border-color: rgba(0,217,178,.4);
  box-shadow: 0 12px 36px rgba(0,217,178,.12);
}
.card:hover::before{ opacity:1; }
.card-icon{
  width:48px; height:48px;
  border-radius: 12px;
  display:flex; align-items:center; justify-content:center;
  background: var(--brand-soft);
  color: var(--brand);
  margin-bottom: 18px;
  border: 1px solid rgba(0,217,178,.25);
}
.card h3{ color: var(--text); }
.card p{ margin:0; color: var(--text-soft); font-size:.95rem; }

/* ===== 关于 ===== */
.about-wrap{
  display:grid;
  grid-template-columns: 1.3fr 1fr;
  gap: 56px;
  align-items: start;
}
.about-text .eyebrow{ }
.bullet{ list-style:none; padding:0; margin: 1em 0 0; }
.bullet li{
  position:relative;
  padding-left: 28px;
  margin-bottom: 12px;
  color: var(--text-soft);
}
.bullet li::before{
  content:"";
  position:absolute;
  left:0; top:.55em;
  width:14px; height:14px;
  border-radius:4px;
  background: linear-gradient(135deg, var(--brand), var(--accent));
  box-shadow: 0 0 12px rgba(0,217,178,.45);
}
.about-stats{
  display:grid;
  grid-template-columns: repeat(2, minmax(0,1fr));
  gap: 14px;
  background: var(--surface);
  border:1px solid var(--line);
  border-radius: var(--radius);
  padding: 22px;
}
.stat{
  text-align:center;
  padding: 18px 8px;
  border-radius: var(--radius-sm);
  background: rgba(255,255,255,.03);
  border:1px solid var(--line);
}
.stat .num{
  display:block;
  font-size: 1.6rem;
  font-weight: 700;
  background: linear-gradient(120deg, var(--brand), var(--accent));
  -webkit-background-clip: text; background-clip: text;
  color: transparent;
  margin-bottom: 4px;
}
.stat .label{ display:block; font-size:.85rem; color: var(--text-mute); }

/* ===== 联系 ===== */
.contact-grid{ align-items: stretch; }
.contact-card{
  background: var(--surface);
  border:1px solid var(--line);
  border-radius: var(--radius);
  padding: 32px;
  height:100%;
}
.contact-card h3{
  margin-bottom: 18px;
  padding-bottom: 14px;
  border-bottom: 1px dashed var(--line-strong);
}
.contact-card dl{ margin:0 0 20px; }
.contact-card dt{
  font-size:.76rem;
  color: var(--text-mute);
  letter-spacing:.12em;
  text-transform: uppercase;
  margin-top: 14px;
}
.contact-card dt:first-of-type{ margin-top:0; }
.contact-card dd{
  margin: 4px 0 0;
  color: var(--text);
  font-size:.98rem;
  line-height: 1.55;
}

/* ===== 页脚 ===== */
.site-footer{
  margin-top: 40px;
  background: #060e1c;
  border-top: 1px solid var(--line);
  color: var(--text-mute);
  padding: 48px 0 24px;
}
.footer-wrap{
  display:flex;
  justify-content: space-between;
  gap: 40px;
  flex-wrap: wrap;
  padding-bottom: 28px;
  border-bottom: 1px solid var(--line);
}
.footer-brand{ display:flex; flex-direction:column; gap:6px; max-width: 560px; }
.footer-brand strong{ color: var(--text); font-weight:600; font-size:1rem; }
.footer-brand span{ font-size:.85rem; color: var(--text-mute); }
.footer-nav{ display:flex; gap:24px; flex-wrap:wrap; }
.footer-nav a{ color: var(--text-soft); font-size:.9rem; }
.footer-nav a:hover{ color: var(--brand); }
.footer-meta{ padding-top: 18px; font-size:.82rem; color: var(--text-mute); }

/* ===== 隐私政策页 ===== */
.legal{ padding: clamp(64px, 10vw, 112px) 0; }
.legal article{
  max-width: 820px;
  margin: 0 auto;
  background: var(--surface);
  border:1px solid var(--line);
  border-radius: var(--radius);
  padding: clamp(28px, 4vw, 56px);
}
.legal h1{ font-size: clamp(1.7rem, 1.5vw + 1rem, 2.3rem); }
.legal h2{
  font-size: 1.2rem; margin-top: 1.8em;
  padding-top: 1em; border-top: 1px dashed var(--line-strong);
  color: var(--text);
}
.legal h2:first-of-type{ border-top:0; padding-top:0; margin-top: 1em; }
.legal p, .legal li{ color: var(--text-soft); font-size:.97rem; }
.legal ul{ padding-left: 22px; }
.legal .meta{ font-size:.85rem; color: var(--text-mute); margin-bottom: 2em; }
.legal strong{ color: var(--text); }

/* ===== 响应式 ===== */
@media (max-width: 960px){
  .grid-4{ grid-template-columns: repeat(2, minmax(0,1fr)); }
  .about-wrap{ grid-template-columns: 1fr; gap:32px; }
}
@media (max-width: 720px){
  .nav-toggle{ display:flex; }
  .nav{
    position:absolute; top:68px; right:0; left:0;
    flex-direction:column; gap:0;
    background: var(--bg);
    border-bottom:1px solid var(--line);
    padding: 8px 24px 16px;
    transform: translateY(-8px);
    opacity:0;
    pointer-events:none;
    transition: opacity .2s ease, transform .2s ease;
  }
  .nav a{
    padding: 12px 0;
    border-bottom:1px solid var(--line);
    width: 100%;
  }
  .nav a:last-child{ border-bottom:0; }
  .site-header.menu-open .nav{
    opacity:1; transform: translateY(0); pointer-events:auto;
  }
  .grid-4{ grid-template-columns: 1fr; }
  .grid-2{ grid-template-columns: 1fr; }
  .footer-wrap{ flex-direction:column; gap:24px; }
}