/* 张PE - 官网样式 */
:root {
  --primary: #2563eb;
  --primary-dark: #1e4fd8;
  --accent: #f97316;
  --text: #1f2937;
  --text-2: #6b7280;
  --bg: #ffffff;
  --bg-soft: #f3f6fb;
  --border: #e5e7eb;
  --radius: 12px;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
}
a { text-decoration: none; color: inherit; }
.container { max-width: 1080px; margin: 0 auto; padding: 0 20px; }

/* 顶部导航 */
.nav {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255,255,255,.92); backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}
.nav-inner { display: flex; align-items: center; justify-content: space-between; height: 62px; }
.logo { display: flex; align-items: center; gap: 10px; font-size: 22px; font-weight: 800; }
.logo-badge {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: #fff; width: 36px; height: 36px; border-radius: 10px;
  display: flex; align-items: center; justify-content: center; font-size: 15px;
}
.nav-links { display: flex; gap: 22px; align-items: center; }
.nav-links a { color: var(--text-2); font-size: 15px; }
.nav-links a:hover, .nav-links a.active { color: var(--primary); }
.nav-dl {
  background: var(--accent); color: #fff !important; padding: 8px 18px;
  border-radius: 8px; font-weight: 600;
}

/* 首屏 Hero */
.hero {
  text-align: center; padding: 90px 20px 70px;
  background: linear-gradient(180deg, #eef4ff 0%, #fff 100%);
}
.hero h1 { font-size: 52px; font-weight: 900; letter-spacing: 1px; }
.hero h1 span { color: var(--primary); }
.hero p.sub { font-size: 19px; color: var(--text-2); margin: 18px 0 34px; }
.hero-cta { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
.btn {
  display: inline-block; padding: 15px 40px; border-radius: 12px;
  font-size: 18px; font-weight: 700; cursor: pointer; border: none; transition: transform .15s, box-shadow .15s;
}
.btn-primary { background: var(--accent); color: #fff; box-shadow: 0 6px 20px rgba(249,115,22,.35); }
.btn-ghost { background: #fff; color: var(--primary); border: 2px solid var(--primary); }
.btn:hover { transform: translateY(-2px); }
.hero-tip { margin-top: 26px; font-size: 14px; color: var(--text-2); }

/* 亮点 */
.features { padding: 70px 20px; }
.section-title { text-align: center; font-size: 32px; font-weight: 800; margin-bottom: 14px; }
.section-sub { text-align: center; color: var(--text-2); margin-bottom: 46px; font-size: 16px; }
.feat-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 22px; }
.feat-card {
  background: var(--bg-soft); border-radius: var(--radius); padding: 30px 26px;
  border: 1px solid var(--border);
}
.feat-icon { font-size: 34px; margin-bottom: 14px; }
.feat-card h3 { font-size: 19px; margin-bottom: 8px; }
.feat-card p { color: var(--text-2); font-size: 15px; }

/* 教程入口 */
.tutorial { padding: 70px 20px; background: var(--bg-soft); }
.steps { display: grid; grid-template-columns: repeat(3,1fr); gap: 22px; margin-bottom: 34px; }
.step-card { background: #fff; border-radius: var(--radius); padding: 28px; border: 1px solid var(--border); }
.step-num {
  width: 34px; height: 34px; border-radius: 50%; background: var(--primary); color: #fff;
  display: flex; align-items: center; justify-content: center; font-weight: 700; margin-bottom: 12px;
}
.step-card h3 { font-size: 18px; margin-bottom: 6px; }
.step-card p { color: var(--text-2); font-size: 14px; }
.tut-cta { text-align: center; }

/* 页脚 */
.footer {
  background: #0f172a; color: #94a3b8; padding: 40px 20px; font-size: 14px; text-align: center;
}
.footer .promise { color: #fbbf24; font-size: 16px; margin-bottom: 12px; font-weight: 600; }
.footer .links { margin-bottom: 12px; }
.footer .links a { color: #cbd5e1; margin: 0 12px; }
.footer .copy { color: #64748b; }

/* 下载页 */
.page-head { background: linear-gradient(180deg,#eef4ff,#fff); padding: 60px 20px 40px; text-align: center; }
.page-head h1 { font-size: 38px; font-weight: 900; }
.page-head p { color: var(--text-2); margin-top: 10px; }
.dl-section { padding: 50px 20px 70px; }
.dl-card {
  border: 1px solid var(--border); border-radius: var(--radius); padding: 28px;
  display: flex; align-items: center; justify-content: space-between; gap: 20px; flex-wrap: wrap; margin-bottom: 18px;
}
.dl-card .ver { font-size: 20px; font-weight: 800; }
.dl-card .meta { color: var(--text-2); font-size: 13px; margin-top: 6px; }
.dl-btn { background: var(--accent); color:#fff; padding: 13px 32px; border-radius: 10px; font-weight: 700; }
.hash { font-family: monospace; background: var(--bg-soft); border:1px solid var(--border); border-radius: 8px; padding: 14px 18px; font-size: 12px; color: var(--text-2); overflow-wrap: anywhere; }

/* 教程详情 */
.tut-page { padding: 50px 20px 80px; }
.tut-block { margin-bottom: 40px; }
.tut-block h2 { font-size: 26px; margin-bottom: 16px; padding-bottom: 10px; border-bottom: 2px solid var(--border); }
.tut-block h3 { font-size: 18px; margin: 22px 0 8px; }
.tut-block p, .tut-block li { color: var(--text-2); font-size: 16px; }
.tut-block ol, .tut-block ul { padding-left: 22px; }
.tut-block li { margin: 8px 0; }
.warn {
  background: #fff7ed; border: 1px solid #fed7aa; color: #c2410c;
  border-radius: 10px; padding: 14px 18px; margin: 16px 0;
}

@media (max-width: 760px) {
  .hero h1 { font-size: 34px; }
  .hero { padding: 60px 16px 50px; }
  .feat-grid, .steps { grid-template-columns: 1fr; }
  .nav-links { gap: 12px; font-size: 13px; }
  .nav-links a { font-size: 13px; }
  .section-title { font-size: 26px; }
}