/* 巴兔游戏手游平台 - 落地页样式（零外部依赖，全部本地化） */
:root {
  --primary: #2F6BFF;
  --primary-deep: #1E4FD8;
  --primary-soft: #EDF2FF;
  --dark: #141A2E;
  --dark-2: #1C2440;
  --text: #1B2333;
  --text-2: #4E5768;
  --border: #E4E8F0;
  --bg: #F6F7FB;
  --card: #FFFFFF;
  --star: #FFB02E;
  --shadow: 0 10px 24px rgba(20, 26, 46, 0.08);
  --radius: 16px;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 76px;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
  text-decoration: none;
}

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

.container {
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: 76px 0;
}

.section-title {
  font-size: 30px;
  font-weight: 700;
  text-align: center;
  letter-spacing: 0.5px;
}

.section-sub {
  max-width: 640px;
  margin: 10px auto 40px;
  font-size: 15px;
  color: var(--text-2);
  text-align: center;
}

/* 顶部导航 */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: var(--card);
  border-bottom: 1px solid var(--border);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  max-width: 1180px;
  height: 64px;
  margin: 0 auto;
  padding: 0 24px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 20px;
  font-weight: 700;
  color: var(--dark);
  white-space: nowrap;
}

.logo svg {
  color: var(--primary);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 2px;
}

.nav-links a {
  padding: 8px 10px;
  font-size: 14px;
  color: var(--text-2);
  border-radius: 8px;
  transition: color 0.2s, background 0.2s;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--primary);
  background: var(--primary-soft);
}

.nav-btn {
  padding: 7px 16px;
  font-size: 14px;
  font-weight: 600;
  color: #FFFFFF;
  background: var(--primary);
  border-radius: 8px;
  white-space: nowrap;
  transition: background 0.2s, transform 0.2s;
}

.nav-btn:hover {
  background: var(--primary-deep);
  transform: translateY(-1px);
}

/* 首屏 Hero */
.hero {
  position: relative;
  overflow: hidden;
  padding: 120px 0 84px;
  background: var(--dark);
  color: #FFFFFF;
}

.hero .deco {
  position: absolute;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.05);
  pointer-events: none;
}

.hero .deco-1 {
  top: -120px;
  right: 10%;
  width: 320px;
  height: 320px;
}

.hero .deco-2 {
  bottom: -80px;
  left: 8%;
  width: 200px;
  height: 200px;
}

.hero-grid {
  position: relative;
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 48px;
  align-items: center;
}

.hero h1 {
  font-size: 40px;
  font-weight: 800;
  line-height: 1.3;
  margin-bottom: 18px;
}

.hero-desc {
  max-width: 560px;
  margin-bottom: 32px;
  font-size: 16px;
  color: rgba(255, 255, 255, 0.82);
}

.hero-btns {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

.btn-primary,
.btn-light,
.btn-ghost {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 13px 26px;
  font-size: 15px;
  font-weight: 600;
  text-align: center;
  border-radius: 10px;
  transition: background 0.2s, color 0.2s, transform 0.2s;
}

.btn-primary {
  color: #FFFFFF;
  background: var(--primary);
}

.btn-primary:hover {
  background: var(--primary-deep);
  transform: translateY(-2px);
}

.btn-light {
  color: var(--dark);
  background: #FFFFFF;
}

.btn-light:hover {
  background: var(--primary-soft);
  transform: translateY(-2px);
}

.btn-ghost {
  color: #FFFFFF;
  border: 1px solid rgba(255, 255, 255, 0.5);
}

.btn-ghost:hover {
  background: rgba(255, 255, 255, 0.12);
  transform: translateY(-2px);
}

.hero-img {
  display: flex;
  justify-content: center;
}

.hero-img img {
  width: 300px;
  border-radius: 18px;
  box-shadow: 0 18px 40px rgba(0, 0, 0, 0.35);
}

/* 游戏预览 */
.preview {
  background: var(--card);
}

.preview-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 22px;
}

.preview-card {
  overflow: hidden;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: transform 0.25s, box-shadow 0.25s;
}

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

.preview-card img {
  width: 100%;
  height: auto;
}

.preview-card figcaption {
  padding: 14px 16px;
  font-size: 15px;
  font-weight: 600;
  text-align: center;
}

/* 产品介绍 */
.intro-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 48px;
  align-items: center;
}

.intro-text p {
  margin-bottom: 14px;
  color: var(--text-2);
}

.intro-list {
  display: grid;
  gap: 12px;
  margin-top: 22px;
  list-style: none;
}

.intro-list li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 14px 16px;
  font-size: 15px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
}

.intro-list svg {
  flex: none;
  margin-top: 3px;
  color: var(--primary);
}

.intro-card {
  padding: 34px;
  background: var(--dark);
  border-radius: var(--radius);
  color: #FFFFFF;
}

.intro-card h3 {
  font-size: 20px;
  margin-bottom: 14px;
}

.intro-card p {
  font-size: 15px;
  color: rgba(255, 255, 255, 0.78);
}

/* 核心功能 */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}

.feature-card {
  padding: 26px 24px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: transform 0.25s, box-shadow 0.25s;
}

.feature-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow);
}

.feature-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 46px;
  height: 46px;
  margin-bottom: 14px;
  color: var(--primary);
  background: var(--primary-soft);
  border-radius: 12px;
}

.feature-card h3 {
  font-size: 17px;
  margin-bottom: 6px;
}

.feature-card p {
  font-size: 14px;
  color: var(--text-2);
}

/* 优势对比 */
.compare {
  background: var(--card);
}

.compare-wrap {
  overflow: hidden;
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.compare-table {
  width: 100%;
  border-collapse: collapse;
  table-layout: fixed;
}

.compare-table th,
.compare-table td {
  padding: 16px 20px;
  font-size: 15px;
  text-align: left;
  vertical-align: top;
}

.compare-table th {
  font-size: 16px;
  font-weight: 700;
}

.compare-table thead th:first-child {
  color: #FFFFFF;
  background: var(--primary);
}

.compare-table thead th:last-child {
  color: var(--text-2);
  background: #EDEEF3;
}

.compare-table tbody td {
  border-top: 1px solid var(--border);
}

.compare-table tbody td:first-child {
  background: var(--primary-soft);
}

.compare-table tbody td:last-child {
  color: var(--text-2);
  background: var(--bg);
}

.compare-table td strong {
  color: var(--primary-deep);
}

.compare-tip {
  display: none;
  margin-top: 12px;
  font-size: 13px;
  color: var(--text-2);
  text-align: center;
}

/* 平台数据 */
.data-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}

.stat-card {
  padding: 26px 20px;
  text-align: center;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: transform 0.25s, box-shadow 0.25s;
}

.stat-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow);
}

.stat-num {
  font-size: 34px;
  font-weight: 800;
  color: var(--primary);
}

.stat-num span {
  font-size: 22px;
}

.stat-label {
  margin-top: 6px;
  font-size: 14px;
  color: var(--text-2);
}

/* 用户评价 */
.reviews {
  background: var(--card);
}

.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}

.review-card {
  padding: 22px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: transform 0.25s, box-shadow 0.25s;
}

.review-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow);
}

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

.review-avatar {
  display: flex;
  align-items: center;
  justify-content: center;
  flex: none;
  width: 44px;
  height: 44px;
  font-size: 18px;
  font-weight: 700;
  color: #FFFFFF;
  background: var(--primary);
  border-radius: 50%;
}

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

.review-name {
  font-size: 15px;
  font-weight: 600;
}

.review-stars {
  font-size: 13px;
  letter-spacing: 2px;
  color: var(--star);
}

.review-text {
  font-size: 14px;
  color: var(--text-2);
}

/* 版本更新 */
.version-card {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 40px;
  padding: 34px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.version-left {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 10px;
}

.version-badge {
  padding: 4px 10px;
  font-size: 13px;
  font-weight: 600;
  color: var(--primary);
  background: var(--primary-soft);
  border-radius: 999px;
}

.version-no {
  font-size: 30px;
  font-weight: 800;
}

.version-time {
  font-size: 14px;
  color: var(--text-2);
}

.version-left .btn-primary {
  margin-top: 10px;
}

.version-right h4 {
  font-size: 18px;
  margin-bottom: 14px;
}

.version-right ul {
  display: grid;
  gap: 12px;
  list-style: none;
}

.version-right li {
  position: relative;
  padding-left: 20px;
  font-size: 14px;
  color: var(--text-2);
}

.version-right li::before {
  position: absolute;
  top: 9px;
  left: 0;
  width: 7px;
  height: 7px;
  content: "";
  background: var(--primary);
  border-radius: 50%;
}

/* FAQ */
.faq-list {
  display: grid;
  gap: 14px;
  max-width: 780px;
  margin: 0 auto;
}

.faq-item {
  overflow: hidden;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
}

.faq-q {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  width: 100%;
  padding: 16px 18px;
  font-size: 15px;
  font-weight: 600;
  color: var(--text);
  text-align: left;
  background: none;
  border: none;
  cursor: pointer;
}

.faq-arrow {
  flex: none;
  color: var(--primary);
  transition: transform 0.25s;
}

.faq-item.open .faq-arrow {
  transform: rotate(180deg);
}

.faq-a {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease;
}

.faq-a p {
  padding: 0 18px 16px;
  font-size: 14px;
  color: var(--text-2);
}

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

/* 下载区域 */
.download {
  padding: 84px 0;
  background: var(--dark);
  color: #FFFFFF;
  text-align: center;
}

.download .container {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.download h1 {
  font-size: 34px;
  font-weight: 800;
  margin-bottom: 14px;
}

.download-meta {
  margin-bottom: 28px;
  font-size: 14px;
  color: rgba(255, 255, 255, 0.7);
}

.download-btns {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 16px;
}

.download-tip {
  margin-top: 22px;
  font-size: 14px;
  color: rgba(255, 255, 255, 0.75);
}

/* 页脚 */
.footer {
  padding: 34px 0;
  background: var(--dark-2);
  color: rgba(255, 255, 255, 0.75);
  font-size: 14px;
  text-align: center;
}

.footer a {
  font-weight: 600;
  color: #FFFFFF;
  text-decoration: none;
}

.footer-note {
  margin-top: 6px;
  font-size: 12px;
  color: rgba(255, 255, 255, 0.55);
}

/* 返回顶部 */
.back-top {
  position: fixed;
  right: 24px;
  bottom: 32px;
  z-index: 99;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  color: #FFFFFF;
  background: var(--primary);
  border: none;
  border-radius: 50%;
  box-shadow: var(--shadow);
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: opacity 0.25s, transform 0.25s, background 0.2s, visibility 0.25s;
}

.back-top.show {
  opacity: 1;
  visibility: visible;
  transform: none;
}

.back-top:hover {
  background: var(--primary-deep);
}

/* 平板适配 */
@media (max-width: 1023px) {
  .nav-inner {
    padding: 0 20px;
  }

  .nav-links {
    gap: 0;
  }

  .nav-links a {
    padding: 8px 7px;
    font-size: 13px;
  }

  .hero h1 {
    font-size: 32px;
  }

  .hero-img img {
    width: 260px;
  }

  .preview-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .intro-grid {
    grid-template-columns: 1fr;
    gap: 36px;
  }

  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .data-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .reviews-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .version-card {
    grid-template-columns: 1fr;
    gap: 28px;
  }
}

/* 移动端适配 */
@media (max-width: 767px) {
  body {
    font-size: 15px;
  }

  .container {
    padding: 0 20px;
  }

  .section {
    padding: 48px 0;
  }

  .section-title {
    font-size: 24px;
  }

  .section-sub {
    margin-bottom: 28px;
  }

  .nav-inner {
    height: 56px;
    padding: 0 20px;
  }

  .nav-links {
    display: none;
  }

  .logo {
    font-size: 18px;
  }

  .nav-btn {
    padding: 6px 14px;
    font-size: 13px;
  }

  .hero {
    padding: 84px 0 48px;
  }

  .hero-grid {
    grid-template-columns: 1fr;
    gap: 28px;
  }

  .hero h1 {
    font-size: 26px;
  }

  .hero-btns {
    flex-direction: column;
    width: 100%;
  }

  .hero-btns .btn-primary,
  .hero-btns .btn-ghost {
    width: 100%;
  }

  .hero-img img {
    width: 220px;
  }

  .preview-grid {
    grid-template-columns: 1fr;
  }

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

  .compare-wrap {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }

  .compare-table {
    table-layout: auto;
    min-width: 640px;
  }

  .compare-table th,
  .compare-table td {
    white-space: nowrap;
  }

  .compare-tip {
    display: block;
  }

  .data-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 14px;
  }

  .stat-num {
    font-size: 26px;
  }

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

  .version-card {
    display: block;
    padding: 24px 20px;
  }

  .version-left {
    align-items: center;
    padding-bottom: 20px;
    margin-bottom: 20px;
    text-align: center;
    border-bottom: 1px dashed var(--border);
  }

  .version-left .btn-primary {
    width: 100%;
  }

  .version-no {
    font-size: 28px;
  }

  .version-right h4 {
    text-align: center;
  }

  .version-right ul {
    gap: 14px;
  }

  .version-right li {
    line-height: 1.7;
  }

  .download {
    padding: 56px 0;
  }

  .download h1 {
    font-size: 26px;
  }

  .download-meta {
    font-size: 12px;
    white-space: nowrap;
  }

  .download-btns {
    flex-direction: column;
    width: 100%;
  }

  .download-btns .btn-primary,
  .download-btns .btn-light {
    width: 100%;
  }

  .back-top {
    right: 16px;
    bottom: 20px;
    width: 40px;
    height: 40px;
  }
}