:root {
  --primary: #FF6A2B;
  --primary-600: #F0560F;
  --primary-100: #FFF1E9;
  --dark: #1D2333;
  --dark-2: #2A3146;
  --text: #27303E;
  --text-2: #5D6675;
  --border: #E8ECF2;
  --bg: #F7F9FC;
  --card: #FFFFFF;
  --star: #FFB400;
  --radius: 16px;
  --shadow: 0 8px 24px rgba(29, 35, 51, .08);
  --shadow-hover: 0 16px 34px rgba(29, 35, 51, .14);
  --container: 1180px;
  --nav-h: 64px;
}

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

html { scroll-behavior: smooth; scroll-padding-top: calc(var(--nav-h) + 10px); }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

img { display: block; width: 100%; height: auto; }

a { text-decoration: none; color: inherit; }
ul, ol { list-style: none; }
button { font-family: inherit; border: none; background: none; cursor: pointer; }

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

/* ===== 按钮 ===== */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  padding: 12px 28px; border-radius: 999px;
  font-size: 15px; font-weight: 600; cursor: pointer; text-align: center;
  transition: transform .25s ease, box-shadow .25s ease, background-color .25s ease;
}
.btn-primary { background: var(--primary); color: #fff; box-shadow: 0 8px 20px rgba(255, 106, 43, .35); }
.btn-primary:hover { background: var(--primary-600); }
.btn-ghost { background: var(--card); color: var(--primary); border: 1.5px solid var(--primary); }
.btn-ghost:hover { background: var(--primary-100); }
.btn:hover { transform: translateY(-2px); }

/* ===== 顶部导航 ===== */
.nav {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255, 255, 255, .9);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}
.nav-inner {
  max-width: var(--container); margin: 0 auto; height: var(--nav-h);
  padding: 0 24px; display: flex; align-items: center;
}
.logo { display: inline-flex; align-items: center; min-height: 40px; font-size: 22px; font-weight: 800; color: var(--primary); letter-spacing: .5px; white-space: nowrap; }
.nav-menu { display: flex; gap: 2px; margin-left: auto; }
.nav-menu a {
  padding: 6px 11px; font-size: 13.5px; color: var(--text-2);
  border-radius: 8px; white-space: nowrap;
  transition: color .2s ease, background-color .2s ease;
}
.nav-menu a:hover { color: var(--primary); background: var(--primary-100); }
.nav-menu a.active { color: var(--primary); font-weight: 600; background: var(--primary-100); }
.btn-nav {
  display: inline-flex; align-items: center; justify-content: center;
  margin-left: 16px; padding: 7px 16px; border-radius: 999px;
  background: var(--primary); color: #fff; font-size: 13px; font-weight: 600;
  white-space: nowrap; transition: background-color .25s ease;
}
.btn-nav:hover { background: var(--primary-600); }

/* ===== 首屏 Hero ===== */
.hero { background: linear-gradient(180deg, var(--primary-100) 0%, var(--bg) 100%); padding: 60px 0 76px; }
.hero-inner { display: flex; align-items: center; gap: 56px; }
.hero-text { flex: 1.15; }
.hero-badge {
  display: inline-block; padding: 5px 14px; border-radius: 999px;
  background: var(--card); color: var(--primary); font-size: 13px; font-weight: 600;
  border: 1px solid rgba(255, 106, 43, .25);
}
.hero h1 { font-size: 44px; line-height: 1.25; font-weight: 800; color: var(--dark); margin: 16px 0 18px; }
.hero h1 .ver, .dl-card h1 .ver { color: var(--primary); }
.hero-desc { font-size: 16px; color: var(--text-2); max-width: 560px; }
.hero-btns { display: flex; gap: 14px; margin-top: 28px; }
.hero-tags { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 24px; }
.hero-tags li {
  font-size: 13px; color: var(--text-2);
  background: var(--card); border: 1px solid var(--border);
  padding: 4px 12px; border-radius: 999px;
}
.hero-poster { flex: 1; display: flex; justify-content: center; }
.hero-poster img { max-width: 300px; border-radius: 20px; box-shadow: 0 24px 48px rgba(255, 106, 43, .25); }

/* ===== 通用区块 ===== */
.section { padding: 76px 0; }
.sec-head { text-align: center; margin-bottom: 44px; }
.sec-head h2 { font-size: 32px; font-weight: 800; color: var(--dark); }
.sec-head p { margin-top: 10px; color: var(--text-2); font-size: 15px; }
.card {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius);
  transition: transform .25s ease, box-shadow .25s ease;
}
.card:hover { transform: translateY(-6px); box-shadow: var(--shadow-hover); }

/* ===== 作品预览 ===== */
.works-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.work-card { overflow: hidden; }
.work-card img { transition: transform .35s ease; }
.work-card:hover img { transform: scale(1.03); }
.work-card figcaption { padding: 14px 16px; font-size: 14px; color: var(--text-2); text-align: center; }

/* ===== 产品介绍 ===== */
.about-grid { display: grid; grid-template-columns: 1.1fr 1fr; gap: 44px; align-items: center; }
.about-text p { font-size: 15.5px; color: var(--text-2); margin-bottom: 14px; }
.about-cards { display: grid; gap: 16px; }
.mini-card { display: flex; gap: 14px; align-items: flex-start; padding: 20px; }
.mc-ico {
  flex: none; width: 44px; height: 44px; border-radius: 12px;
  background: var(--primary-100); color: var(--primary);
  display: flex; align-items: center; justify-content: center;
}
.mini-card b { display: block; font-size: 15.5px; color: var(--dark); margin-bottom: 4px; }
.mini-card p { font-size: 14px; color: var(--text-2); }

/* ===== 核心功能 ===== */
.features-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.feature-card { padding: 28px; }
.fc-ico {
  width: 52px; height: 52px; border-radius: 14px;
  background: var(--primary-100); color: var(--primary);
  display: flex; align-items: center; justify-content: center; margin-bottom: 18px;
}
.feature-card h3 { font-size: 17px; color: var(--dark); margin-bottom: 8px; }
.feature-card p { font-size: 14px; color: var(--text-2); }

/* ===== 优势对比 ===== */
.compare { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow); }
.compare-row { display: grid; grid-template-columns: 1fr 1.35fr 1.35fr; }
.compare-row > div { padding: 16px 18px; font-size: 14.5px; border-top: 1px solid var(--border); }
.compare-row > div + div { border-left: 1px solid var(--border); }
.compare-head { background: var(--dark); }
.compare-head > div { color: #fff; font-weight: 600; border-top: none; border-color: rgba(255, 255, 255, .12); }
.compare-head > div:nth-child(2) { background: var(--primary); }
.compare-row:not(.compare-head) > div:first-child,
.compare-row:not(.compare-head) > div:last-child { color: var(--text-2); }
.compare-row:not(.compare-head) > div:nth-child(2) { background: rgba(255, 106, 43, .06); color: var(--primary-600); font-weight: 600; }

/* ===== 平台数据 ===== */
.data-sec { background: linear-gradient(135deg, var(--dark) 0%, var(--dark-2) 100%); }
.data-sec .sec-head h2 { color: #fff; }
.data-sec .sec-head p { color: #A7AFC2; }
.data-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.data-item {
  background: rgba(255, 255, 255, .06); border: 1px solid rgba(255, 255, 255, .12);
  border-radius: var(--radius); padding: 34px 20px; text-align: center;
  transition: transform .25s ease, background-color .25s ease;
}
.data-item:hover { transform: translateY(-6px); background: rgba(255, 255, 255, .1); }
.data-item b { display: block; font-size: 42px; font-weight: 800; color: var(--primary); line-height: 1.2; }
.data-item b span { font-size: 22px; }
.data-item p { margin-top: 8px; color: #C7CDDC; font-size: 15px; }

/* ===== 用户评价 ===== */
.reviews-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.review-card { padding: 24px; }
.review-top { display: flex; align-items: center; gap: 12px; }
.avatar {
  flex: none; width: 44px; height: 44px; border-radius: 50%;
  background: var(--primary-100); color: var(--primary);
  font-size: 17px; font-weight: 700;
  display: flex; align-items: center; justify-content: center;
}
.review-user { display: flex; flex-direction: column; gap: 2px; }
.review-user b { font-size: 15px; color: var(--dark); }
.stars { color: var(--star); font-size: 13px; letter-spacing: 2px; line-height: 1; }
.review-text { margin-top: 14px; font-size: 14px; color: var(--text-2); }

/* ===== 版本更新 ===== */
.update-card { max-width: 820px; margin: 0 auto; padding: 32px; }
.update-head { display: flex; align-items: center; flex-wrap: wrap; gap: 14px; padding-bottom: 18px; border-bottom: 1px dashed var(--border); }
.ver-badge { background: var(--primary); color: #fff; font-size: 15px; font-weight: 700; padding: 6px 16px; border-radius: 999px; }
.update-head time { margin-left: auto; color: var(--text-2); font-size: 14px; }
.update-list li { position: relative; padding: 10px 0 10px 26px; font-size: 15px; color: var(--text); border-bottom: 1px dashed var(--border); }
.update-list li:last-child { border-bottom: none; }
.update-list li::before {
  content: ""; position: absolute; left: 6px; top: 18px;
  width: 8px; height: 8px; border-radius: 50%; background: var(--primary);
}

/* ===== FAQ 折叠 ===== */
.faq-list { max-width: 820px; margin: 0 auto; display: grid; gap: 14px; }
.faq-item { background: var(--card); border: 1px solid var(--border); border-radius: 14px; overflow: hidden; transition: border-color .25s ease, box-shadow .25s ease; }
.faq-item.open { border-color: var(--primary); box-shadow: var(--shadow); }
.faq-q {
  width: 100%; display: flex; align-items: center; justify-content: space-between; gap: 12px;
  padding: 18px 20px; font-size: 16px; font-weight: 600; color: var(--dark); text-align: left;
}
.faq-ico {
  flex: none; width: 26px; height: 26px; border-radius: 50%;
  background: var(--primary-100); color: var(--primary);
  font-size: 18px; font-weight: 400; font-style: normal;
  display: flex; align-items: center; justify-content: center;
  transition: transform .3s ease, background-color .3s ease;
}
.faq-item.open .faq-ico { transform: rotate(45deg); background: var(--primary); color: #fff; }
.faq-a { display: grid; grid-template-rows: 0fr; transition: grid-template-rows .3s ease; }
.faq-item.open .faq-a { grid-template-rows: 1fr; }
.faq-a-inner { overflow: hidden; min-height: 0; }
.faq-a p { padding: 0 20px 18px; font-size: 14.5px; color: var(--text-2); }

/* ===== 下载区域 ===== */
.dl-sec { background: linear-gradient(180deg, var(--bg) 0%, var(--primary-100) 100%); }
.dl-card { max-width: 760px; margin: 0 auto; padding: 52px 40px; text-align: center; }
.dl-card h1 { font-size: 34px; font-weight: 800; color: var(--dark); }
.dl-meta { margin: 12px 0 30px; font-size: 14px; color: var(--text-2); white-space: nowrap; }
.dl-btns { display: flex; justify-content: center; gap: 16px; }
.btn-lg { padding: 14px 36px; font-size: 16px; }
.dl-tip { margin-top: 22px; font-size: 14.5px; color: var(--primary-600); }

/* ===== 页脚 ===== */
.footer { background: var(--dark); padding: 40px 0; text-align: center; }
.footer-link { color: #fff; font-size: 15px; font-weight: 600; }
.footer .copyright { margin-top: 10px; font-size: 13px; color: #8B93A7; }

/* ===== 返回顶部 ===== */
#backTop {
  position: fixed; right: 24px; bottom: 24px; z-index: 99;
  width: 46px; height: 46px; border-radius: 50%;
  background: var(--primary); color: #fff; font-size: 19px; line-height: 1;
  box-shadow: 0 10px 22px rgba(255, 106, 43, .4);
  opacity: 0; visibility: hidden; transform: translateY(14px);
  transition: opacity .3s ease, transform .3s ease, visibility .3s ease;
}
#backTop.show { opacity: 1; visibility: visible; transform: none; }
#backTop:hover { background: var(--primary-600); }

/* ===== 响应式：平板 ===== */
@media (max-width: 1024px) {
  .container { padding: 0 20px; }
  .section { padding: 60px 0; }
  .hero { padding: 48px 0 60px; }
  .hero h1 { font-size: 36px; }
  .hero-inner { gap: 36px; }
  .works-grid, .features-grid, .reviews-grid { grid-template-columns: repeat(2, 1fr); }
  .about-grid { grid-template-columns: 1fr; gap: 28px; }
}

/* ===== 响应式：小屏导航 ===== */
@media (max-width: 900px) {
  .nav-menu { display: none; }
  .data-grid { grid-template-columns: repeat(2, 1fr); }
}

/* ===== 响应式：手机 ===== */
@media (max-width: 768px) {
  .nav-inner { padding: 0 20px; }
  .btn-nav { margin-left: auto; min-height: 40px; }
  .hero { padding: 36px 0 48px; }
  .hero h1 { font-size: 30px; }
  .hero-inner { flex-direction: column; gap: 32px; }
  .hero-text { text-align: center; }
  .hero-desc { margin: 0 auto; }
  .hero-btns, .dl-btns { flex-direction: column; align-items: stretch; }
  .hero-btns .btn, .dl-btns .btn { width: 100%; }
  .hero-tags { justify-content: center; }
  .hero-poster img { max-width: 260px; }
  .section { padding: 52px 0; }
  .sec-head h2 { font-size: 26px; }
  .works-grid, .features-grid, .reviews-grid { grid-template-columns: 1fr; }
  .compare-row { grid-template-columns: 1fr 1.25fr 1.25fr; }
  .compare-row > div { padding: 12px 10px; font-size: 12.5px; }
  .dl-card { padding: 44px 24px; }
  .dl-card h1 { font-size: 27px; }
  .dl-meta { font-size: 12px; }
  .update-card { padding: 24px; }
  .update-head time { margin-left: 0; }
}