/* ===== 基础 ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --primary: #6C5CE7;
  --primary-dark: #5A4BD6;
  --primary-light: #EFEDFE;
  --dark: #26233B;
  --text: #4A475C;
  --muted: #7B7891;
  --border: #E8E6F4;
  --bg: #F8F7FD;
  --card: #FFFFFF;
  --star: #F5A623;
  --radius: 16px;
  --shadow: 0 4px 18px rgba(108, 92, 231, 0.08);
  --shadow-hover: 0 14px 30px rgba(108, 92, 231, 0.18);
  --nav-h: 64px;
}

html { scroll-behavior: smooth; }

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;
}

a { text-decoration: none; color: inherit; }
img { display: block; width: 100%; height: auto; }
ul { list-style: none; }
button { font-family: inherit; }

section[id] { scroll-margin-top: calc(var(--nav-h) + 10px); }

.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }

/* ===== 通用按钮 ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--primary);
  color: #FFFFFF;
  font-weight: 600;
  border-radius: 999px;
  cursor: pointer;
  transition: background .25s, transform .25s, box-shadow .25s;
}
.btn:hover { background: var(--primary-dark); transform: translateY(-2px); box-shadow: var(--shadow-hover); }
.btn-lg { padding: 15px 36px; font-size: 16px; }
.btn-outline { background: transparent; border: 2px solid var(--primary); color: var(--primary); }
.btn-outline:hover { background: var(--primary); color: #FFFFFF; }
.btn-light { background: #FFFFFF; color: var(--primary); }
.btn-light:hover { background: #F2F0FF; color: var(--primary-dark); }

/* ===== 顶部导航 ===== */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
  transition: box-shadow .3s;
}
.nav.scrolled { box-shadow: 0 6px 24px rgba(38, 35, 59, 0.08); }
.nav-inner { display: flex; align-items: center; height: var(--nav-h); gap: 28px; }
.logo { font-size: 21px; font-weight: 800; color: var(--dark); white-space: nowrap; }
.logo span { color: var(--primary); }
.nav-menu { display: flex; align-items: center; gap: 20px; flex: 1; justify-content: center; }
.nav-menu a { font-size: 15px; color: var(--text); padding: 6px 2px; position: relative; transition: color .2s; }
.nav-menu a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 100%;
  bottom: 0;
  height: 2px;
  border-radius: 2px;
  background: var(--primary);
  transition: right .25s;
}
.nav-menu a:hover, .nav-menu a.active { color: var(--primary); }
.nav-menu a:hover::after, .nav-menu a.active::after { right: 0; }
.nav-btn { padding: 7px 16px; font-size: 14px; }

/* ===== 首屏Hero ===== */
.hero {
  padding: calc(var(--nav-h) + 72px) 0 80px;
  background: linear-gradient(180deg, #F0EEFE 0%, var(--bg) 100%);
}
.hero-inner { display: flex; align-items: center; gap: 64px; }
.hero-text { flex: 1; }
.badge {
  display: inline-block;
  padding: 6px 14px;
  border-radius: 999px;
  background: var(--primary-light);
  color: var(--primary);
  font-size: 13px;
  font-weight: 600;
}
.hero h1 { font-size: 46px; line-height: 1.2; color: var(--dark); margin: 18px 0 14px; }
.hero h1 span { color: var(--primary); }
.hero-desc { font-size: 16px; max-width: 560px; margin-bottom: 30px; }
.hero-btns { display: flex; gap: 16px; flex-wrap: wrap; }
.hero-img { flex: 0 0 320px; }
.hero-img img { border-radius: var(--radius); box-shadow: var(--shadow-hover); }

/* ===== 通用区块 ===== */
.section { padding: 84px 0; }
.section-alt {
  background: var(--card);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}
.section-head { text-align: center; margin-bottom: 48px; }
.section-head h2 { font-size: 34px; color: var(--dark); margin-bottom: 10px; }
.section-head p { color: var(--muted); font-size: 15px; }

/* ===== 作品预览 ===== */
.works-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.work-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: transform .3s, box-shadow .3s;
}
.work-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-hover); }

/* ===== 产品介绍 ===== */
.intro-inner { display: flex; align-items: center; gap: 64px; }
.intro-text { flex: 1; }
.intro-text h2 { font-size: 32px; color: var(--dark); margin: 16px 0 18px; }
.intro-text p { margin-bottom: 14px; }
.intro-card {
  flex: 0 0 380px;
  background: linear-gradient(135deg, var(--primary) 0%, #8B7CF6 100%);
  border-radius: var(--radius);
  padding: 36px 32px;
  color: #FFFFFF;
  box-shadow: var(--shadow-hover);
}
.intro-card li {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.18);
  font-size: 15px;
}
.intro-card li:last-child { border-bottom: 0; }
.intro-card li::before {
  content: "";
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #FFFFFF;
  flex: none;
}

/* ===== 核心功能 ===== */
.features-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.feature-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px 28px;
  transition: transform .3s, box-shadow .3s;
}
.feature-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-hover); }
.feature-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 52px;
  height: 52px;
  border-radius: 14px;
  background: var(--primary-light);
  color: var(--primary);
  margin-bottom: 18px;
}
.feature-card h3 { font-size: 18px; color: var(--dark); margin-bottom: 10px; }
.feature-card p { font-size: 14px; }

/* ===== 优势对比 ===== */
.compare-table {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--card);
  box-shadow: var(--shadow);
}
.compare-row { display: grid; grid-template-columns: 1.1fr 1fr 1fr 1fr; }
.compare-row + .compare-row { border-top: 1px solid var(--border); }
.compare-cell {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 16px 14px;
  font-size: 14px;
  text-align: center;
}
.compare-head .compare-cell { background: #F3F1FE; color: var(--dark); font-weight: 700; }
.compare-row .compare-cell:first-child {
  justify-content: flex-start;
  text-align: left;
  font-weight: 600;
  color: var(--dark);
}
.compare-uu { background: var(--primary-light); color: var(--primary-dark); font-weight: 600; }
.compare-head .compare-uu { background: var(--primary); color: #FFFFFF; }
.tag {
  font-size: 11px;
  font-weight: 700;
  background: #FFFFFF;
  color: var(--primary);
  border-radius: 999px;
  padding: 1px 8px;
}

/* ===== 平台数据 ===== */
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.stat-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  text-align: center;
  padding: 38px 20px;
  transition: transform .3s, box-shadow .3s;
}
.stat-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-hover); }
.stat-num { font-size: 42px; font-weight: 800; color: var(--primary); line-height: 1.2; }
.stat-label { margin-top: 10px; color: var(--muted); font-size: 14px; }

/* ===== 用户评价 ===== */
.reviews-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.review-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 26px;
  transition: transform .3s, box-shadow .3s;
}
.review-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-hover); }
.review-user { display: flex; align-items: center; gap: 12px; margin-bottom: 14px; }
.avatar {
  flex: none;
  width: 46px;
  height: 46px;
  border-radius: 50%;
  background: var(--primary-light);
  color: var(--primary);
  font-size: 19px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
}
.review-meta { display: flex; flex-direction: column; }
.review-name { font-size: 15px; font-weight: 600; color: var(--dark); }
.stars { color: var(--star); font-size: 13px; letter-spacing: 2px; margin-top: 2px; }
.review-text { font-size: 14px; }

/* ===== 版本更新 ===== */
.update-card {
  max-width: 760px;
  margin: 0 auto;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 36px;
  box-shadow: var(--shadow);
}
.update-head { display: flex; align-items: center; gap: 16px; margin-bottom: 22px; }
.version-tag {
  background: var(--primary);
  color: #FFFFFF;
  font-weight: 700;
  font-size: 15px;
  padding: 6px 18px;
  border-radius: 999px;
}
.update-time { color: var(--muted); font-size: 14px; }
.update-list li {
  position: relative;
  padding: 11px 0 11px 26px;
  border-bottom: 1px dashed var(--border);
  font-size: 15px;
}
.update-list li:last-child { border-bottom: 0; }
.update-list li::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 19px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--primary);
}

/* ===== FAQ ===== */
.faq-list { max-width: 820px; margin: 0 auto; }
.faq-item {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 14px;
  overflow: hidden;
  transition: box-shadow .3s;
}
.faq-item.open { box-shadow: var(--shadow); }
.faq-q {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 20px 24px;
  background: none;
  border: 0;
  font-size: 16px;
  font-weight: 600;
  color: var(--dark);
  text-align: left;
  cursor: pointer;
}
.faq-icon { flex: none; position: relative; width: 22px; height: 22px; }
.faq-icon::before,
.faq-icon::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  background: var(--primary);
  border-radius: 2px;
  transform: translate(-50%, -50%);
}
.faq-icon::before { width: 14px; height: 2px; }
.faq-icon::after { width: 2px; height: 14px; transition: transform .25s; }
.faq-item.open .faq-icon::after { transform: translate(-50%, -50%) rotate(90deg); }
.faq-a { max-height: 0; overflow: hidden; transition: max-height .3s ease; }
.faq-a-inner { padding: 0 24px 22px; font-size: 14px; }

/* ===== 下载区域 ===== */
.download {
  padding: 88px 0;
  background: linear-gradient(135deg, var(--primary) 0%, #8B7CF6 100%);
  text-align: center;
  color: #FFFFFF;
}
.download h1 { font-size: 38px; margin-bottom: 12px; }
.size-info { font-size: 14px; color: rgba(255, 255, 255, 0.85); margin-bottom: 34px; }
.download-btns { display: flex; justify-content: center; gap: 20px; }
.download-tip { margin-top: 26px; font-size: 15px; color: rgba(255, 255, 255, 0.92); }

/* ===== 页脚 ===== */
.footer { background: var(--dark); color: #A6A3BC; padding: 30px 0; text-align: center; font-size: 14px; }
.footer a { color: #FFFFFF; }

/* ===== 返回顶部 ===== */
.back-top {
  position: fixed;
  right: 26px;
  bottom: 34px;
  z-index: 90;
  width: 46px;
  height: 46px;
  border-radius: 50%;
  border: 0;
  background: var(--primary);
  color: #FFFFFF;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-hover);
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: opacity .3s, transform .3s, visibility .3s, background .3s;
}
.back-top.show { opacity: 1; visibility: visible; transform: translateY(0); }
.back-top:hover { background: var(--primary-dark); }

/* ===== 平板适配 ===== */
@media (max-width: 1024px) {
  .works-grid, .features-grid, .reviews-grid { grid-template-columns: repeat(2, 1fr); }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .hero-inner { gap: 40px; }
  .hero-img { flex-basis: 280px; }
  .intro-inner { gap: 40px; }
  .intro-card { flex-basis: 320px; }
  .nav-inner { gap: 18px; }
  .nav-menu { gap: 16px; }
  .nav-menu a { font-size: 14px; }
}

/* ===== 手机适配 ===== */
@media (max-width: 767px) {
  .container { padding: 0 20px; }
  .nav-menu { display: none; }
  .nav-inner { justify-content: space-between; }
  .hero { padding: calc(var(--nav-h) + 44px) 0 52px; }
  .hero-inner { flex-direction: column; gap: 36px; }
  .hero-text { text-align: center; }
  .hero h1 { font-size: 32px; }
  .hero-desc { font-size: 15px; margin: 0 auto 26px; }
  .hero-btns { flex-direction: column; width: 100%; }
  .hero .btn { width: 100%; padding: 14px 20px; }
  .hero-img { flex: none; width: 100%; max-width: 340px; margin: 0 auto; }
  .section { padding: 56px 0; }
  .section-head { margin-bottom: 34px; }
  .section-head h2 { font-size: 26px; }
  .section-head p { font-size: 14px; }
  .works-grid, .features-grid, .reviews-grid { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 14px; }
  .stat-card { padding: 26px 12px; }
  .stat-num { font-size: 30px; }
  .stat-label { font-size: 13px; }
  .intro-inner { flex-direction: column; gap: 32px; }
  .intro-text h2 { font-size: 26px; }
  .intro-card { flex: none; width: 100%; padding: 28px 24px; }
  .compare-row { grid-template-columns: 0.85fr 1fr 1fr 1fr; }
  .compare-cell { padding: 11px 6px; font-size: 12px; }
  .feature-card { padding: 26px 22px; }
  .update-card { padding: 26px 22px; }
  .update-head { flex-direction: column; align-items: flex-start; gap: 10px; }
  .faq-q { padding: 17px 18px; font-size: 15px; }
  .faq-a-inner { padding: 0 18px 18px; }
  .download { padding: 64px 0; }
  .download h1 { font-size: 30px; }
  .size-info { font-size: 12px; white-space: nowrap; }
  .download-btns { flex-direction: column; width: 100%; }
  .download .btn { width: 100%; }
  .download-tip { font-size: 14px; }
  .back-top { right: 16px; bottom: 22px; }
}

@media (max-width: 420px) {
  .compare-cell { padding: 10px 4px; font-size: 11px; }
}