:root {
  --bg: #0a0e1a;
  --bg-alt: #0d1322;
  --card: rgba(255, 255, 255, 0.04);
  --card-border: rgba(255, 255, 255, 0.08);
  --text: #e8ecf4;
  --text-dim: #9aa3b5;
  --primary: #7c5cff;
  --primary-2: #3ec6ff;
  --accent: #22d3ee;
  --grad: linear-gradient(120deg, #7c5cff 0%, #3ec6ff 100%);
  --radius: 16px;
  --maxw: 1140px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

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

a { color: inherit; text-decoration: none; }

/* ---------- 背景装饰 ---------- */
.bg-grid {
  position: fixed; inset: 0; z-index: -3; pointer-events: none;
  background-image:
    linear-gradient(rgba(255,255,255,0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.025) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(ellipse 80% 60% at 50% 0%, #000 60%, transparent 100%);
}

.bg-glow {
  position: fixed; z-index: -2; border-radius: 50%;
  filter: blur(120px); opacity: 0.35; pointer-events: none;
}
.bg-glow--1 { width: 520px; height: 520px; top: -160px; left: -100px; background: #7c5cff; }
.bg-glow--2 { width: 460px; height: 460px; top: 30%; right: -180px; background: #3ec6ff; }

/* ---------- 导航 ---------- */
.nav {
  position: sticky; top: 0; z-index: 100;
  backdrop-filter: blur(16px);
  background: rgba(10, 14, 26, 0.7);
  border-bottom: 1px solid var(--card-border);
}
.nav__inner { display: flex; align-items: center; justify-content: space-between; height: 64px; }

.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; }
.brand__logo {
  display: grid; place-items: center; width: 36px; height: 36px;
  border-radius: 10px; background: var(--grad); color: #fff;
  font-family: ui-monospace, monospace; font-size: 15px;
}
.brand__name { font-size: 18px; letter-spacing: 0.5px; }

.nav__links { display: flex; gap: 28px; }
.nav__links a { color: var(--text-dim); font-size: 15px; transition: color .2s; }
.nav__links a:hover { color: var(--text); }

.nav__toggle { display: none; flex-direction: column; gap: 5px; background: none; border: none; cursor: pointer; padding: 6px; }
.nav__toggle span { width: 22px; height: 2px; background: var(--text); border-radius: 2px; transition: .3s; }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 12px 26px; border-radius: 12px; font-size: 15px; font-weight: 600;
  transition: transform .2s, box-shadow .2s, background .2s; cursor: pointer;
}
.btn--primary { background: var(--grad); color: #fff; box-shadow: 0 8px 24px rgba(124, 92, 255, .35); }
.btn--primary:hover { transform: translateY(-2px); box-shadow: 0 12px 32px rgba(124, 92, 255, .5); }
.btn--ghost { border: 1px solid var(--card-border); color: var(--text); background: rgba(255,255,255,0.03); }
.btn--ghost:hover { background: rgba(255,255,255,0.08); transform: translateY(-2px); }

/* ---------- Hero ---------- */
.hero { padding: 120px 0 80px; text-align: center; }
.hero__badge {
  display: inline-block; padding: 6px 16px; border-radius: 999px;
  background: rgba(124, 92, 255, 0.12); border: 1px solid rgba(124, 92, 255, 0.3);
  color: #b9a7ff; font-size: 14px; margin-bottom: 28px;
}
.hero__title { font-size: clamp(40px, 7vw, 72px); line-height: 1.15; font-weight: 800; letter-spacing: 1px; }
.grad-text {
  background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero__desc { color: var(--text-dim); font-size: 18px; margin: 24px auto 36px; max-width: 560px; }
.hero__actions { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }


/* ---------- Section 通用 ---------- */
.section { padding: 90px 0; }
.section--alt { background: var(--bg-alt); border-top: 1px solid var(--card-border); border-bottom: 1px solid var(--card-border); }
.section__head { text-align: center; margin-bottom: 56px; }
.section__tag { display: inline-block; font-size: 13px; letter-spacing: 3px; color: var(--accent); font-weight: 600; margin-bottom: 12px; }
.section__title { font-size: clamp(28px, 4vw, 40px); font-weight: 800; }
.section__sub { color: var(--text-dim); margin-top: 10px; }

.glass {
  background: var(--card); border: 1px solid var(--card-border);
  backdrop-filter: blur(12px); border-radius: var(--radius);
}

/* ---------- 品牌定位 ---------- */
.positioning { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 24px; }
.positioning__card { padding: 36px 28px; text-align: center; transition: transform .3s, border-color .3s; }
.positioning__card:hover { transform: translateY(-6px); border-color: rgba(124, 92, 255, 0.4); }
.positioning__icon { font-size: 44px; margin-bottom: 18px; }
.positioning__card h3 { font-size: 21px; margin-bottom: 12px; }
.positioning__card p { color: var(--text-dim); font-size: 15px; }

/* ---------- 合作范围 ---------- */
.services { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 20px; }
.service { padding: 32px 24px; text-align: center; transition: transform .3s, border-color .3s; }
.service:hover { transform: translateY(-6px); border-color: rgba(62, 198, 255, 0.4); }
.service__icon { font-size: 40px; margin-bottom: 16px; }
.service h3 { font-size: 19px; margin-bottom: 10px; }
.service p { color: var(--text-dim); font-size: 14.5px; }

/* ---------- 技术栈 ---------- */
.stack { display: flex; flex-wrap: wrap; justify-content: center; gap: 16px; }
.stack__item { display: flex; align-items: center; gap: 10px; padding: 14px 22px; font-size: 15px; font-weight: 600; }
.stack__dot { width: 10px; height: 10px; border-radius: 50%; background: var(--c); box-shadow: 0 0 10px var(--c); }

/* ---------- CTA ---------- */
.cta { padding: 64px 32px; text-align: center; max-width: 720px; margin: 0 auto; }
.cta__title { font-size: clamp(26px, 4vw, 36px); font-weight: 800; margin-bottom: 12px; }
.cta__desc { color: var(--text-dim); margin-bottom: 28px; }

/* ---------- Footer ---------- */
.footer { border-top: 1px solid var(--card-border); padding: 32px 0; }
.footer__inner { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 16px; }
.brand--sm .brand__name { font-size: 16px; }
.brand--sm .brand__logo { width: 30px; height: 30px; font-size: 13px; }
.footer__copy { color: var(--text-dim); font-size: 14px; }

/* ---------- 动画 ---------- */
@keyframes fadeUp { from { opacity: 0; transform: translateY(24px); } to { opacity: 1; transform: none; } }
.reveal { opacity: 0; animation: fadeUp .7s ease forwards; }

/* ---------- 响应式 ---------- */
@media (max-width: 760px) {
  .nav__links, .nav__cta { display: none; }
  .nav__toggle { display: flex; }
  .nav__links.open {
    display: flex; flex-direction: column; position: absolute; top: 64px; left: 0; right: 0;
    background: rgba(10, 14, 26, 0.96); padding: 20px 24px; gap: 18px; border-bottom: 1px solid var(--card-border);
  }
  .hero { padding: 80px 0 60px; }
  .hide-sm { display: none; }
  .positioning, .services { grid-template-columns: 1fr; }
}