/* ===== 全局变量 ===== */
:root {
  --main: #FF5C8A;
  --main-dark: #E84877;
  --main-soft: #FFF0F5;
  --dark: #1F2430;
  --text: #3A4150;
  --muted: #6B7280;
  --border: #ECEFF4;
  --bg: #FFFFFF;
  --bg-soft: #FAFBFC;
  --gold: #FFB400;
  --pink-line: #FFD3E1;
  --grad-soft: linear-gradient(180deg, var(--main-soft) 0%, var(--bg) 100%);
  --radius: 16px;
  --radius-lg: 20px;
  --shadow: 0 8px 24px rgba(31, 36, 48, 0.08);
  --shadow-hover: 0 14px 34px rgba(255, 92, 138, 0.18);
  --maxw: 1200px;
}

/* ===== 基础重置 ===== */
* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; scroll-padding-top: 80px; }

body {
  font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

a { text-decoration: none; color: inherit; }
ul { list-style: none; }
img { display: block; width: 100%; height: auto; border-radius: var(--radius); }

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

.section { padding: 76px 0; }
.section-soft { background: var(--bg-soft); }

.sec-title {
  font-size: 30px;
  font-weight: 700;
  color: var(--dark);
  text-align: center;
  margin-bottom: 10px;
}

.sec-sub {
  text-align: center;
  color: var(--muted);
  margin-bottom: 42px;
}

/* ===== 按钮 ===== */
.btn {
  display: inline-block;
  border: none;
  border-radius: 999px;
  padding: 12px 28px;
  font-size: 15px;
  font-weight: 600;
  line-height: 1.4;
  text-align: center;
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.btn:hover { transform: translateY(-2px); }

.btn-main {
  background: linear-gradient(135deg, var(--main), var(--main-dark));
  color: #fff;
  box-shadow: 0 8px 20px rgba(255, 92, 138, 0.32);
}

.btn-main:hover { box-shadow: 0 12px 28px rgba(255, 92, 138, 0.42); }

.btn-soft {
  background: var(--main-soft);
  color: var(--main-dark);
  border: 1px solid var(--pink-line);
}

.btn-soft:hover { box-shadow: var(--shadow-hover); }

/* ===== 顶部固定导航栏 ===== */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.nav-logo {
  font-size: 20px;
  font-weight: 800;
  color: var(--main-dark);
  letter-spacing: 1px;
  white-space: nowrap;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 24px;
}

.nav-menu a {
  font-size: 14px;
  color: var(--text);
  transition: color 0.2s ease;
}

.nav-menu a:hover,
.nav-menu a.active { color: var(--main); }

.nav-btn { padding: 8px 16px; font-size: 13px; }

/* ===== 首屏Hero区 ===== */
.hero {
  padding: 140px 0 80px;
  background: var(--grad-soft);
}

.hero-inner {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 56px;
  align-items: center;
}

.hero-tag {
  display: inline-block;
  background: var(--main-soft);
  color: var(--main-dark);
  border: 1px solid var(--pink-line);
  border-radius: 999px;
  padding: 5px 14px;
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 18px;
}

.hero-text h1 {
  font-size: 42px;
  font-weight: 800;
  color: var(--dark);
  line-height: 1.3;
  margin-bottom: 18px;
}

.version { color: var(--main); }

.hero-desc {
  color: var(--text);
  font-size: 16px;
  margin-bottom: 30px;
}

.hero-btns { display: flex; gap: 16px; }

.hero-img { position: relative; }

.hero-img::before {
  content: "";
  position: absolute;
  inset: 16px -16px -16px 16px;
  background: linear-gradient(135deg, var(--pink-line), var(--main-soft));
  border-radius: var(--radius-lg);
  z-index: 0;
}

.hero-img img {
  position: relative;
  z-index: 1;
  box-shadow: var(--shadow);
}

/* ===== 作品预览模块 ===== */
.works-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.work-card {
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--bg);
  box-shadow: var(--shadow);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.work-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-hover);
}

/* ===== 产品介绍模块 ===== */
.intro-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 48px;
  align-items: center;
}

.intro-text h3 {
  font-size: 24px;
  color: var(--dark);
  margin-bottom: 14px;
}

.intro-text p {
  color: var(--text);
  margin-bottom: 12px;
}

.intro-list li {
  display: flex;
  align-items: center;
  gap: 10px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px 16px;
  margin-bottom: 12px;
  font-size: 15px;
  color: var(--dark);
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.intro-list li:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-hover);
}

.intro-list li::before {
  content: "◆";
  color: var(--main);
}

/* ===== 核心功能模块 ===== */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.feat-card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.feat-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-hover);
}

.feat-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 52px;
  height: 52px;
  border-radius: 14px;
  background: var(--main-soft);
  font-size: 24px;
  margin-bottom: 16px;
}

.feat-card h3 {
  font-size: 18px;
  color: var(--dark);
  margin-bottom: 8px;
}

.feat-card p {
  font-size: 14px;
  color: var(--muted);
}

/* ===== 优势对比模块 ===== */
.compare {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow);
}

.compare-row {
  display: grid;
  grid-template-columns: 1.2fr 1fr 1fr;
  border-bottom: 1px solid var(--border);
}

.compare-row:last-child { border-bottom: none; }

.compare-row > span {
  padding: 16px 20px;
  font-size: 15px;
  display: flex;
  align-items: center;
}

.compare-head > span {
  font-weight: 700;
  font-size: 16px;
}

.c-item { color: var(--dark); font-weight: 600; background: var(--bg-soft); }

.c-brand { color: var(--main-dark); background: var(--main-soft); font-weight: 600; }

.c-other { color: var(--muted); background: var(--bg); }

/* ===== 平台数据模块 ===== */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.stat-card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 30px 20px;
  text-align: center;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.stat-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-hover);
}

.stat-card strong {
  display: block;
  font-size: 34px;
  font-weight: 800;
  color: var(--main);
  margin-bottom: 6px;
}

.stat-card span {
  font-size: 15px;
  color: var(--muted);
}

/* ===== 用户真实评价模块 ===== */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.review-card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.review-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-hover);
}

.review-head {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 14px;
}

.avatar {
  width: 46px;
  height: 46px;
  flex-shrink: 0;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--main), var(--main-dark));
  color: #fff;
  font-size: 20px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
}

.review-meta { display: flex; flex-direction: column; }

.r-name {
  font-size: 15px;
  font-weight: 700;
  color: var(--dark);
}

.r-stars {
  font-size: 14px;
  color: var(--gold);
  letter-spacing: 2px;
}

.review-card p {
  font-size: 14px;
  color: var(--text);
}

/* ===== 版本更新模块 ===== */
.version-card {
  max-width: 760px;
  margin: 0 auto;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 34px 36px;
  box-shadow: var(--shadow);
}

.version-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
  padding-bottom: 18px;
  margin-bottom: 18px;
  border-bottom: 1px solid var(--border);
}

.v-badge {
  background: linear-gradient(135deg, var(--main), var(--main-dark));
  color: #fff;
  font-size: 15px;
  font-weight: 700;
  padding: 6px 16px;
  border-radius: 999px;
}

.v-date {
  font-size: 14px;
  color: var(--muted);
}

.version-list li {
  position: relative;
  padding-left: 22px;
  font-size: 15px;
  color: var(--text);
  margin-bottom: 12px;
}

.version-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--main);
}

/* ===== FAQ折叠问答模块 ===== */
.faq { max-width: 820px; margin: 0 auto; }

.faq-item {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 14px;
  overflow: hidden;
  transition: box-shadow 0.25s ease;
}

.faq-item.open { box-shadow: var(--shadow); }

.faq-q {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 22px;
  font-size: 16px;
  font-weight: 600;
  color: var(--dark);
  cursor: pointer;
  user-select: none;
}

.faq-icon {
  position: relative;
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  margin-left: 14px;
}

.faq-icon::before,
.faq-icon::after {
  content: "";
  position: absolute;
  background: var(--main);
  border-radius: 2px;
  transition: transform 0.3s ease;
}

.faq-icon::before { left: 4px; top: 9px; width: 12px; height: 2px; }
.faq-icon::after { left: 9px; top: 4px; width: 2px; height: 12px; }

.faq-item.open .faq-icon::after { transform: scaleY(0); }

.faq-a {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease;
}

.faq-a p {
  padding: 0 22px 18px;
  font-size: 14px;
  color: var(--muted);
}

.faq-item.open .faq-a { max-height: 320px; }

/* ===== 下载区域模块 ===== */
.download {
  text-align: center;
  background: var(--grad-soft);
}

.download-title {
  font-size: 36px;
  font-weight: 800;
  color: var(--dark);
  margin-bottom: 14px;
}

.download-meta {
  font-size: 14px;
  color: var(--muted);
  margin-bottom: 30px;
}

.download-btns {
  display: flex;
  justify-content: center;
  gap: 18px;
  flex-wrap: wrap;
  margin-bottom: 22px;
}

.download-tip {
  font-size: 15px;
  color: var(--text);
}

/* ===== 底部页脚版权 ===== */
.footer {
  background: var(--dark);
  padding: 30px 0;
  text-align: center;
}

.footer p {
  font-size: 14px;
  color: #B8BEC9;
}

.footer a {
  color: #fff;
  font-weight: 600;
}

/* ===== 返回顶部按钮 ===== */
.back-top {
  position: fixed;
  right: 24px;
  bottom: 30px;
  z-index: 90;
  width: 46px;
  height: 46px;
  border: none;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--main), var(--main-dark));
  color: #fff;
  font-size: 20px;
  cursor: pointer;
  box-shadow: 0 8px 20px rgba(255, 92, 138, 0.4);
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: opacity 0.3s ease, transform 0.3s ease, visibility 0.3s ease;
}

.back-top.show {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

/* ===== 平板适配 ===== */
@media (max-width: 1024px) {
  .nav-menu { gap: 16px; }
  .nav-menu a { font-size: 13px; }
  .hero { padding: 130px 0 64px; }
  .hero-inner { gap: 40px; }
  .hero-text h1 { font-size: 36px; }
  .works-grid { grid-template-columns: repeat(2, 1fr); }
  .features-grid { grid-template-columns: repeat(2, 1fr); }
  .reviews-grid { grid-template-columns: repeat(2, 1fr); }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
}

/* ===== 手机适配 ===== */
@media (max-width: 767px) {
  .container { padding: 0 20px; }

  .section { padding: 56px 0; }

  .sec-title { font-size: 24px; }
  .sec-sub { margin-bottom: 30px; }

  .nav-menu { display: none; }

  .hero { padding: 112px 0 48px; }
  .hero-inner {
    grid-template-columns: 1fr;
    gap: 36px;
    text-align: center;
  }
  .hero-text h1 { font-size: 28px; }
  .hero-desc { font-size: 15px; }
  .hero-btns, .download-btns { flex-direction: column; }
  .hero-btns { width: 100%; }
  .hero-btns .btn, .download-btns .btn { width: 100%; }
  .hero-img { max-width: 340px; margin: 0 auto; }

  .works-grid { grid-template-columns: 1fr; gap: 20px; }

  .intro-grid { grid-template-columns: 1fr; gap: 28px; }
  .intro-text h3 { font-size: 21px; }

  .features-grid { grid-template-columns: 1fr; gap: 16px; }

  .compare { background: transparent; border: none; box-shadow: none; }

  .compare-row {
    grid-template-columns: 1fr;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 14px;
    margin-bottom: 12px;
    overflow: hidden;
  }

  .compare-row:last-child {
    margin-bottom: 0;
    border-bottom: 1px solid var(--border);
  }

  .compare-head { display: none; }

  .compare-row > span {
    padding: 10px 14px;
    font-size: 13px;
    align-items: flex-start;
    gap: 8px;
    line-height: 1.5;
  }

  .c-item {
    padding: 12px 14px 10px;
    font-size: 14px;
    font-weight: 700;
    color: var(--dark);
    background: transparent;
    border-bottom: 1px dashed var(--border);
  }

  .c-brand { background: transparent; }
  .c-other { background: transparent; }

  .c-brand::before,
  .c-other::before {
    content: "";
    flex-shrink: 0;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 68px;
    padding: 3px 10px;
    border-radius: 999px;
    font-size: 11px;
    font-weight: 700;
    margin-top: 1px;
  }

  .c-brand::before { content: "韩漫漫画"; background: var(--main); color: #fff; }
  .c-other::before { content: "其他App"; background: #E9EBF0; color: var(--muted); }

  .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 14px; }
  .stat-card { padding: 22px 12px; }
  .stat-card strong { font-size: 26px; }

  .reviews-grid { grid-template-columns: 1fr; gap: 16px; }

  .version-card { padding: 26px 20px; }

  .download-title { font-size: 26px; }
  .download-meta { font-size: 12px; }
  .download-btns { flex-direction: column; }
  .download-btns .btn { width: 100%; }

  .back-top { right: 16px; bottom: 20px; width: 42px; height: 42px; }
}