*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}
body{font-family:"PingFang SC","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;line-height:1.6;color:#333;background:#fff;-webkit-font-smoothing:antialiased}
a{text-decoration:none;color:inherit}
img{max-width:100%;height:auto;display:block}

.container{max-width:1080px;margin:0 auto;padding:0 20px}

/* ── Header ── */
.header{background:#fff;box-shadow:0 1px 4px rgba(0,0,0,.08);position:sticky;top:0;z-index:100}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:60px}
.logo{display:flex;align-items:center;gap:10px;font-size:18px;font-weight:700;color:#333}
.logo img{width:36px;height:36px;border-radius:8px}
.nav{display:flex;gap:28px}
.nav-link{font-size:15px;color:#555;transition:color .2s}
.nav-link:hover,.nav-link.active{color:#ff6a00}

/* ── Buttons ── */
.btn{display:inline-block;padding:14px 36px;border-radius:8px;font-size:15px;font-weight:600;transition:background .2s,transform .15s;cursor:pointer;border:none;text-align:center}
.btn-primary{background:#ff6a00;color:#fff}
.btn-primary:hover{background:#e65e00;transform:translateY(-2px)}
.btn-secondary{background:#fff;color:#ff6a00;border:2px solid #ff6a00}
.btn-secondary:hover{background:#ff6a00;color:#fff;transform:translateY(-2px)}
.btn-outline{background:transparent;color:#555;border:2px solid #ddd}
.btn-outline:hover{border-color:#ff6a00;color:#ff6a00}

/* ── Hero (index) ── */
.hero{padding:72px 0 56px;background:linear-gradient(135deg,#fff 0%,#fff7f2 100%);text-align:center}
.hero h1{font-size:42px;font-weight:800;color:#222;margin-bottom:16px}
.hero-desc{max-width:680px;margin:0 auto 32px;font-size:17px;color:#555;line-height:1.8}
.hero-buttons{display:flex;justify-content:center;gap:16px;flex-wrap:wrap;margin-bottom:12px}
.hero-hint{font-size:13px;color:#999}

/* ── Reviews ── */
.reviews{padding:64px 0;background:#f9f9f9}
.section-title{font-size:28px;font-weight:700;color:#222;text-align:center;margin-bottom:40px}
.reviews-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.review-card{background:#fff;padding:28px;border-radius:12px;box-shadow:0 2px 8px rgba(0,0,0,.06)}
.review-stars{color:#ff6a00;font-size:18px;margin-bottom:12px;letter-spacing:2px}
.review-text{font-size:15px;color:#444;line-height:1.75;margin-bottom:20px}
.review-user{display:flex;align-items:center;gap:12px}
.review-avatar{width:40px;height:40px;border-radius:50%;object-fit:cover}
.review-name{font-size:14px;font-weight:600;color:#333}
.review-meta{font-size:12px;color:#999}

/* ── Knowledge Cards ── */
.knowledge{padding:64px 0;background:#fff}
.cards-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:20px}
.card{background:#fafafa;border:1px solid #f0f0f0;border-radius:12px;padding:28px}
.card h3{font-size:17px;font-weight:700;color:#222;margin-bottom:10px}
.card p{font-size:15px;color:#555;line-height:1.75}

/* ── Download Header ── */
.dl-header{padding:56px 0 32px;background:linear-gradient(135deg,#fff 0%,#fff7f2 100%);text-align:center}
.dl-header h1{font-size:30px;font-weight:800;color:#222;margin-bottom:12px}
.dl-subtitle{font-size:16px;color:#666}

/* ── Platform Cards ── */
.dl-cards{padding:40px 0 72px}
.platform-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.platform-card{background:#fff;border:1px solid #eee;border-radius:14px;padding:32px;text-align:center;transition:box-shadow .2s,transform .15s}
.platform-card:hover{box-shadow:0 8px 28px rgba(0,0,0,.1);transform:translateY(-4px)}
.platform-card h2{font-size:22px;font-weight:700;color:#222;margin-bottom:8px}
.version-tag{display:inline-block;padding:4px 14px;background:#fff5ef;color:#ff6a00;border-radius:20px;font-size:13px;font-weight:600;margin-bottom:12px}
.sys-req{font-size:14px;color:#666;margin-bottom:6px}
.file-size{font-size:13px;color:#999;margin-bottom:20px}
.platform-card .btn{width:100%;margin-bottom:8px}
.jump-hint{display:block;font-size:12px;color:#aaa;margin-bottom:14px}
.variants{display:flex;justify-content:center;gap:8px;font-size:13px;flex-wrap:wrap}
.variant-link{color:#ff6a00;transition:color .2s}
.variant-link:hover{color:#e65e00;text-decoration:underline}
.variant-sep{color:#ddd}

/* ── Footer ── */
.footer{background:#2b2b2b;color:#999;padding:40px 0;text-align:center}
.footer p{font-size:13px;margin-bottom:6px;line-height:1.7}

/* ── Responsive ── */
@media(max-width:900px){
  .reviews-grid{grid-template-columns:1fr}
  .cards-grid{grid-template-columns:1fr}
  .platform-grid{grid-template-columns:1fr}
}
@media(max-width:640px){
  .header-inner{height:52px}
  .logo{font-size:16px}
  .logo img{width:30px;height:30px}
  .nav{gap:20px}
  .nav-link{font-size:14px}
  .hero{padding:48px 0 36px}
  .hero h1{font-size:28px}
  .hero-desc{font-size:15px}
  .hero-buttons{flex-direction:column;align-items:center}
  .btn{width:100%;max-width:300px}
  .section-title{font-size:24px}
  .dl-header h1{font-size:22px}
  .footer{padding:28px 0}
}