/* ===== 全局重置 ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Segoe UI", sans-serif;
  background: #0b0c10;
  color: #e0e0e0;
  line-height: 1.7;
  font-size: 16px;
}
a { text-decoration: none; color: inherit; }
ul { list-style: none; }
img { max-width: 100%; }

/* ===== 布局 ===== */
.container { max-width: 1160px; margin: 0 auto; padding: 0 20px; }

/* ===== 顶部导航 ===== */
.header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(11,12,16,0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(255,255,255,0.06);
}
.nav-wrap {
  display: flex; align-items: center; gap: 32px;
  height: 64px;
}
.logo {
  display: flex; align-items: center; gap: 10px;
  font-size: 1.2rem; font-weight: 700; color: #fff; flex-shrink: 0;
}
.logo-icon {
  width: 34px; height: 34px; border-radius: 8px;
  background: linear-gradient(135deg, #e8490e 0%, #f5a623 100%);
  display: flex; align-items: center; justify-content: center;
  font-size: 1rem; font-weight: 900; color: #fff;
}
.logo-text { color: #fff; }
.nav { display: flex; gap: 24px; margin-left: auto; }
.nav a { color: #aaa; font-size: 0.95rem; transition: color 0.2s; }
.nav a:hover, .nav a.active { color: #fff; }
.btn-nav-dl {
  background: linear-gradient(135deg, #e8490e, #f5a623);
  color: #fff; padding: 8px 20px; border-radius: 6px;
  font-size: 0.9rem; font-weight: 600;
  transition: opacity 0.2s; flex-shrink: 0;
}
.btn-nav-dl:hover { opacity: 0.85; }

/* ===== 英雄区 ===== */
.hero {
  background: radial-gradient(ellipse at 50% 0%, rgba(232,73,14,0.18) 0%, transparent 70%),
              linear-gradient(180deg, #0f1117 0%, #0b0c10 100%);
  padding: 100px 0 80px;
  text-align: center;
}
.hero-inner { max-width: 760px; margin: 0 auto; }
.hero-badge {
  display: inline-block;
  background: rgba(232,73,14,0.15);
  border: 1px solid rgba(232,73,14,0.35);
  color: #f5a623; font-size: 0.85rem; font-weight: 600;
  padding: 5px 16px; border-radius: 20px; margin-bottom: 24px;
  letter-spacing: 0.04em;
}
.hero-title {
  font-size: clamp(2rem, 5vw, 3.4rem);
  font-weight: 800; color: #fff; line-height: 1.2;
  margin-bottom: 20px;
}
.gradient-text {
  background: linear-gradient(90deg, #e8490e, #f5a623, #ffcf6d);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-sub { font-size: 1.05rem; color: #999; margin-bottom: 36px; line-height: 1.8; }
.hero-btns { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; margin-bottom: 20px; }
.hero-tips { color: #666; font-size: 0.85rem; }

/* ===== 通用按钮 ===== */
.btn-primary {
  display: inline-flex; align-items: center; gap: 8px;
  background: linear-gradient(135deg, #e8490e 0%, #f5a623 100%);
  color: #fff; padding: 14px 32px; border-radius: 8px;
  font-size: 1rem; font-weight: 700;
  transition: transform 0.15s, box-shadow 0.15s;
  box-shadow: 0 4px 20px rgba(232,73,14,0.35);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 28px rgba(232,73,14,0.45); }
.btn-primary.full { width: 100%; justify-content: center; }
.btn-primary.large { padding: 16px 48px; font-size: 1.1rem; }
.btn-ghost {
  display: inline-flex; align-items: center;
  border: 1px solid rgba(255,255,255,0.2);
  color: #ccc; padding: 14px 28px; border-radius: 8px;
  font-size: 0.95rem; font-weight: 500;
  transition: border-color 0.2s, color 0.2s;
}
.btn-ghost:hover { border-color: rgba(255,255,255,0.5); color: #fff; }

/* ===== 平台下载卡片 ===== */
.section-platforms { padding: 80px 0; background: #0b0c10; }
.sec-title {
  text-align: center; font-size: clamp(1.5rem, 3vw, 2.2rem);
  font-weight: 700; color: #fff; margin-bottom: 12px;
}
.sec-sub { text-align: center; color: #777; margin-bottom: 48px; font-size: 0.95rem; }
.platform-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(170px, 1fr));
  gap: 16px;
}
.platform-card {
  background: #13151c;
  border: 1px solid rgba(255,255,255,0.07);
  border-radius: 12px; padding: 28px 16px 22px;
  text-align: center;
  transition: border-color 0.2s, transform 0.2s, background 0.2s;
  display: flex; flex-direction: column; align-items: center; gap: 8px;
}
.platform-card:hover {
  border-color: rgba(232,73,14,0.5); background: #1a1c25; transform: translateY(-4px);
}
.pc-icon { font-size: 2.2rem; }
.pc-name { font-size: 1rem; font-weight: 700; color: #fff; }
.pc-ver { font-size: 0.78rem; color: #666; margin-bottom: 10px; }
.btn-dl {
  background: linear-gradient(135deg, #e8490e, #f5a623);
  color: #fff; padding: 7px 18px; border-radius: 6px;
  font-size: 0.85rem; font-weight: 600;
  transition: opacity 0.2s; margin-top: auto;
}

/* ===== 功能特性 ===== */
.section-features { padding: 80px 0; background: #0e0f15; }
.feat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 24px;
}
.feat-card {
  background: #13151c; border: 1px solid rgba(255,255,255,0.06);
  border-radius: 12px; padding: 32px 28px;
  transition: border-color 0.2s, transform 0.2s;
}
.feat-card:hover { border-color: rgba(232,73,14,0.4); transform: translateY(-3px); }
.feat-icon { font-size: 2rem; margin-bottom: 14px; }
.feat-card h3 { font-size: 1.1rem; font-weight: 700; color: #fff; margin-bottom: 10px; }
.feat-card p { color: #888; font-size: 0.9rem; line-height: 1.7; }

/* ===== FAQ ===== */
.section-faq { padding: 80px 0; background: #0b0c10; }
.faq-list { max-width: 760px; margin: 0 auto; display: flex; flex-direction: column; gap: 12px; }
.faq-item {
  background: #13151c; border: 1px solid rgba(255,255,255,0.07);
  border-radius: 10px; overflow: hidden;
}
.faq-item summary {
  padding: 18px 24px; font-size: 0.98rem; font-weight: 600; color: #e0e0e0;
  cursor: pointer; list-style: none;
  display: flex; justify-content: space-between; align-items: center;
  transition: color 0.2s;
}
.faq-item summary::after { content: "+"; font-size: 1.3rem; color: #f5a623; }
.faq-item[open] summary::after { content: "−"; }
.faq-item summary:hover { color: #fff; }
.faq-item p { padding: 0 24px 18px; color: #888; font-size: 0.9rem; line-height: 1.7; }

/* ===== CTA ===== */
.section-cta {
  padding: 80px 0;
  background: radial-gradient(ellipse at 50% 100%, rgba(232,73,14,0.2) 0%, transparent 70%), #0e0f15;
  text-align: center;
}
.cta-inner h2 { font-size: clamp(1.5rem, 3vw, 2rem); color: #fff; margin-bottom: 12px; }
.cta-inner p { color: #777; margin-bottom: 32px; }

/* ===== 下载页专属 ===== */
.dl-hero {
  background: linear-gradient(180deg, #131520 0%, #0b0c10 100%);
  padding: 60px 0 50px; text-align: center;
}
.dl-hero h1 { font-size: clamp(1.8rem, 4vw, 2.8rem); color: #fff; font-weight: 800; margin-bottom: 12px; }
.dl-hero p { color: #888; font-size: 1rem; }
.section-dl { padding: 60px 0; background: #0b0c10; }
.section-dl.alt { background: #0e0f15; }
.dl-category { font-size: 1.3rem; font-weight: 700; color: #fff; margin-bottom: 28px; }
.dl-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 24px;
}
.dl-card {
  background: #13151c; border: 1px solid rgba(255,255,255,0.07);
  border-radius: 14px; padding: 28px;
  display: flex; flex-direction: column; gap: 16px;
  transition: border-color 0.2s, transform 0.2s;
}
.dl-card:hover { border-color: rgba(232,73,14,0.45); transform: translateY(-3px); }
.dl-card.featured { border-color: rgba(232,73,14,0.3); }
.dl-card-top { display: flex; align-items: center; gap: 16px; }
.dl-os-icon { font-size: 2.4rem; flex-shrink: 0; }
.dl-os-name { font-size: 1.1rem; font-weight: 700; color: #fff; }
.dl-os-ver { font-size: 0.82rem; color: #666; margin-top: 4px; }
.dl-feature-list { display: flex; flex-direction: column; gap: 7px; }
.dl-feature-list li { font-size: 0.88rem; color: #888; }

/* ===== 页脚 ===== */
.footer {
  background: #08090c; border-top: 1px solid rgba(255,255,255,0.06);
  padding: 40px 0; text-align: center;
}
.footer-inner { display: flex; flex-direction: column; gap: 16px; align-items: center; }
.footer-links { display: flex; gap: 28px; flex-wrap: wrap; justify-content: center; }
.footer-links a { color: #666; font-size: 0.9rem; transition: color 0.2s; }
.footer-links a:hover { color: #ccc; }
.footer-copy { color: #444; font-size: 0.82rem; }

/* ===== 响应式 ===== */
@media (max-width: 768px) {
  .nav { display: none; }
  .hero { padding: 60px 0 50px; }
  .hero-btns { flex-direction: column; align-items: center; }
  .platform-grid { grid-template-columns: repeat(2, 1fr); }
  .feat-grid, .dl-grid { grid-template-columns: 1fr; }
}