/* ===== 产品官网风格 ===== */
:root {
  --p-primary: #ff6a00;
  --p-primary-dark: #e05a00;
  --p-secondary: #0057ff;
  --p-secondary-dark: #003c9e;
  --p-bg: #f9f9fb;
  --p-text: #20123a;
  --p-muted: #5b5b66;
  --p-card: #ffffff;
  --p-radius: 12px;
  --p-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  color: var(--p-text);
  background: var(--p-bg);
  line-height: 1.6;
}
a { text-decoration: none; color: inherit; }
img { max-width: 100%; display: block; }
.container { max-width: 1120px; margin: 0 auto; padding: 0 24px; }

/* 导航栏 */
.nav {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid #eee;
}
.nav-inner { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.logo { display: flex; align-items: center; gap: 10px; font-size: 20px; font-weight: 700; }
.logo-icon { width: 34px; height: 34px; display: inline-flex; align-items: center; justify-content: center; }
.nav-links { display: flex; align-items: center; gap: 28px; }
.nav-links a { font-size: 15px; color: var(--p-text); transition: color 0.2s; }
.nav-links a:hover, .nav-links a.active { color: var(--p-primary); }
.nav-download {
  background: var(--p-primary); color: #fff !important;
  padding: 8px 20px; border-radius: 999px; font-weight: 600;
  transition: background 0.2s;
}
.nav-download:hover { background: var(--p-primary-dark); }

/* Hero */
.hero {
  background: linear-gradient(135deg, #ff6a00 0%, #ff9a3d 50%, #0057ff 130%);
  color: #fff; padding: 88px 0 72px; text-align: center;
  position: relative; overflow: hidden;
}
.hero::after {
  content: ""; position: absolute; right: -120px; bottom: -160px;
  width: 420px; height: 420px; border-radius: 50%;
  background: rgba(255, 255, 255, 0.08);
}
.hero-badge {
  display: inline-block; background: rgba(255, 255, 255, 0.18);
  border: 1px solid rgba(255, 255, 255, 0.3);
  padding: 6px 16px; border-radius: 999px; font-size: 13px; margin-bottom: 24px;
}
.hero h1 { font-size: 52px; font-weight: 800; letter-spacing: -1px; line-height: 1.15; }
.hero p { font-size: 18px; max-width: 640px; margin: 20px auto 36px; opacity: 0.95; }
.btn-group { display: flex; justify-content: center; gap: 16px; flex-wrap: wrap; position: relative; z-index: 1; }
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 14px 32px; border-radius: 999px;
  font-size: 16px; font-weight: 600; cursor: pointer;
  transition: transform 0.2s, box-shadow 0.2s;
}
.btn:hover { transform: translateY(-2px); }
.btn-primary { background: #fff; color: var(--p-primary); box-shadow: 0 6px 18px rgba(0, 0, 0, 0.18); }
.btn-primary:hover { box-shadow: 0 10px 24px rgba(0, 0, 0, 0.22); }
.btn-ghost { background: transparent; color: #fff; border: 2px solid rgba(255, 255, 255, 0.6); }
.btn-ghost:hover { background: rgba(255, 255, 255, 0.12); }

/* 特性 */
.features { padding: 72px 0; }
.section-title { text-align: center; font-size: 34px; font-weight: 700; margin-bottom: 12px; }
.section-sub { text-align: center; color: var(--p-muted); font-size: 16px; max-width: 560px; margin: 0 auto 44px; }
.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 24px; }
.card {
  background: var(--p-card); border-radius: var(--p-radius);
  padding: 32px 24px; box-shadow: var(--p-shadow);
  transition: transform 0.25s, box-shadow 0.25s;
}
.card:hover { transform: translateY(-6px); box-shadow: 0 16px 36px rgba(0, 0, 0, 0.14); }
.card-icon {
  width: 52px; height: 52px; border-radius: 14px;
  display: flex; align-items: center; justify-content: center;
  margin-bottom: 18px; font-size: 26px;
}
.icon-orange { background: rgba(255, 113, 57, 0.12); }
.icon-blue { background: rgba(0, 96, 223, 0.12); }
.icon-purple { background: rgba(132, 94, 234, 0.12); }
.icon-green { background: rgba(53, 181, 127, 0.12); }
.card h3 { font-size: 19px; margin-bottom: 10px; }
.card p { color: var(--p-muted); font-size: 14.5px; }

/* 品牌区 */
.brand { background: var(--p-text); color: #fff; padding: 72px 0; }
.brand-inner { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: center; }
.brand h2 { font-size: 32px; margin-bottom: 16px; }
.brand p { color: rgba(255, 255, 255, 0.82); margin-bottom: 12px; }
.brand-stats { display: flex; gap: 36px; margin-top: 24px; }
.stat b { display: block; font-size: 30px; color: var(--p-primary); }
.stat span { font-size: 13px; color: rgba(255, 255, 255, 0.7); }

/* 页脚 */
.footer { background: #17142a; color: rgba(255, 255, 255, 0.72); padding: 40px 0 32px; font-size: 14px; }
.footer-inner { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 16px; }
.footer-links { display: flex; gap: 24px; }
.footer-links a { color: rgba(255, 255, 255, 0.72); transition: color 0.2s; }
.footer-links a:hover { color: var(--p-primary); }

/* 下载页 */
.download-hero {
  background: linear-gradient(135deg, #0057ff 0%, #003c9e 100%); color: #fff; padding: 72px 0; text-align: center;
}
.download-hero h1 { font-size: 40px; margin-bottom: 12px; }
.download-hero p { opacity: 0.92; max-width: 600px; margin: 0 auto; }
.platforms { padding: 64px 0; }
.platform-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); gap: 20px; margin-bottom: 48px; }
.platform-card {
  background: var(--p-card); border-radius: var(--p-radius);
  padding: 28px 20px; text-align: center; box-shadow: var(--p-shadow);
  transition: transform 0.2s, box-shadow 0.2s;
}
.platform-card:hover { transform: translateY(-5px); box-shadow: 0 14px 30px rgba(0, 96, 223, 0.18); }
.platform-icon { font-size: 40px; margin-bottom: 12px; }
.platform-card h3 { font-size: 17px; margin-bottom: 14px; }
.dl-btn {
  display: block; background: var(--p-secondary); color: #fff;
  padding: 10px 0; border-radius: 999px; font-size: 14px; font-weight: 600;
  transition: background 0.2s;
}
.dl-btn:hover { background: var(--p-secondary-dark); }
.info-box {
  background: #eef3fe; border: 1px solid #d4e0fa;
  border-radius: var(--p-radius); padding: 28px; margin-bottom: 24px;
}
.info-box h3 { color: var(--p-secondary); margin-bottom: 12px; }
.info-box ul { padding-left: 20px; color: var(--p-text); }
.info-box li { margin-bottom: 8px; }

/* 404 */
.error-section { min-height: calc(100vh - 176px); display: flex; align-items: center; justify-content: center; text-align: center; padding: 80px 24px; }
.error-code {
  font-size: 140px; font-weight: 800;
  background: linear-gradient(135deg, var(--p-primary), var(--p-secondary));
  -webkit-background-clip: text; background-clip: text; color: transparent; line-height: 1;
}
.error-section h1 { font-size: 32px; margin: 16px 0 12px; }
.error-section p { color: var(--p-muted); max-width: 460px; margin: 0 auto 32px; }

/* 响应式 */
@media (max-width: 768px) {
  .hero h1 { font-size: 36px; }
  .download-hero h1 { font-size: 30px; }
  .error-code { font-size: 96px; }
  .brand-inner { grid-template-columns: 1fr; }
  .nav-links a:not(.nav-download) { display: none; }
  .footer-inner { flex-direction: column; text-align: center; }
}