/* ============ mufy 官网落地页样式 ============ */
/* 配色统一由 CSS 变量管理 */

:root {
  --primary: #FF5C8A;
  --primary-deep: #E8457C;
  --primary-soft: #FFE7F0;
  --accent: #9D6BFF;
  --grad: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
  --dark: #3B2233;
  --border: #F4D9E5;
  --bg: #FFF9FB;
  --bg-alt: #FDF0F5;
  --card: #FFFFFF;
  --text: #34242D;
  --text-light: #85707B;
  --radius: 16px;
  --shadow: 0 10px 30px rgba(255, 92, 138, 0.12);
  --shadow-hover: 0 18px 40px rgba(255, 92, 138, 0.2);
  --nav-h: 64px;
}

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

html { scroll-behavior: smooth; }

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

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

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

ul { list-style: none; }

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

section[id] { scroll-margin-top: calc(var(--nav-h) + 12px); }

/* ============ 顶部固定粘性导航栏 ============ */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--nav-h);
  background: rgba(255, 249, 251, 0.92);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid transparent;
  transition: border-color .3s, box-shadow .3s;
}

.nav.scrolled { border-bottom-color: var(--border); box-shadow: 0 4px 18px rgba(255, 92, 138, 0.08); }

.nav-inner {
  max-width: 1180px;
  height: 100%;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
}

.logo {
  font-size: 24px;
  font-weight: 800;
  color: var(--dark);
  letter-spacing: 0.5px;
  white-space: nowrap;
}

.logo-dot { color: var(--primary); font-size: 18px; margin-left: 2px; }

.nav-menu {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav-menu a {
  font-size: 14px;
  color: var(--text);
  padding: 8px 11px;
  border-radius: 8px;
  transition: color .25s, background .25s;
  white-space: nowrap;
}

.nav-menu a:hover,
.nav-menu a.active { color: var(--primary); background: var(--bg-alt); }

.btn-nav {
  font-size: 13px;
  font-weight: 700;
  color: #fff;
  background: var(--grad);
  padding: 8px 16px;
  border-radius: 999px;
  white-space: nowrap;
  box-shadow: 0 6px 16px rgba(255, 92, 138, 0.3);
  transition: transform .25s, box-shadow .25s;
}

.btn-nav:hover { transform: translateY(-2px); box-shadow: 0 10px 22px rgba(255, 92, 138, 0.38); }

/* ============ 通用按钮 ============ */
.btn-hero {
  display: inline-block;
  font-size: 16px;
  font-weight: 700;
  text-align: center;
  color: #fff;
  background: var(--grad);
  padding: 14px 34px;
  border-radius: 999px;
  box-shadow: 0 10px 26px rgba(255, 92, 138, 0.32);
  transition: transform .25s, box-shadow .25s;
}

.btn-hero:hover { transform: translateY(-3px); box-shadow: 0 14px 32px rgba(255, 92, 138, 0.42); }

.btn-hero.small { font-size: 14px; padding: 11px 26px; }

/* ============ 首屏 Hero 区 ============ */
.hero {
  padding: calc(var(--nav-h) + 56px) 0 72px;
  background: radial-gradient(1100px 520px at 78% -10%, rgba(255, 163, 192, 0.35), transparent 60%),
              radial-gradient(800px 420px at 8% 20%, rgba(157, 107, 255, 0.16), transparent 55%);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 56px;
  align-items: center;
}

.hero-tag {
  display: inline-block;
  font-size: 13px;
  font-weight: 700;
  color: var(--primary-deep);
  background: var(--primary-soft);
  border: 1px solid var(--border);
  padding: 6px 14px;
  border-radius: 999px;
  margin-bottom: 18px;
}

.hero h1 {
  font-size: 44px;
  line-height: 1.25;
  color: var(--dark);
  font-weight: 800;
  margin-bottom: 18px;
}

.hero-desc { font-size: 16px; color: var(--text-light); max-width: 520px; margin-bottom: 26px; }

.persona-row { margin-bottom: 30px; }

.persona-label { font-size: 14px; font-weight: 700; color: var(--dark); display: block; margin-bottom: 12px; }

.persona-list { display: flex; flex-wrap: wrap; gap: 14px; }

.persona-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
}

.persona-item img {
  width: 62px;
  height: 62px;
  border-radius: 50%;
  object-fit: cover;
  border: 3px solid #fff;
  box-shadow: 0 4px 14px rgba(255, 92, 138, 0.25);
  transition: transform .3s, box-shadow .3s;
}

.persona-item:hover img { transform: translateY(-4px) scale(1.05); box-shadow: 0 8px 20px rgba(255, 92, 138, 0.35); }

.persona-item em { font-style: normal; font-size: 12px; color: var(--text-light); }

/* ---- 聊天窗口（微信风格） ---- */
.chat-window {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 20px;
  box-shadow: var(--shadow);
  overflow: hidden;
  max-width: 420px;
  margin-left: auto;
}

.chat-head {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 18px;
  background: var(--grad);
}

.chat-avatar {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  object-fit: cover;
  border: 2px solid rgba(255, 255, 255, 0.8);
}

.chat-head-info { display: flex; flex-direction: column; line-height: 1.35; }

.chat-name { color: #fff; font-size: 15px; font-weight: 700; }

.chat-status { color: rgba(255, 255, 255, 0.85); font-size: 12px; }

.chat-body {
  padding: 18px 16px;
  min-height: 318px;
  background: #F7F2F5;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.msg { display: flex; align-items: flex-end; gap: 8px; }

.msg p {
  max-width: 74%;
  padding: 10px 13px;
  border-radius: 14px;
  font-size: 14px;
  line-height: 1.6;
}

.msg-ai p { background: #fff; color: var(--text); border-bottom-left-radius: 4px; }

.msg-me { justify-content: flex-end; }

.msg-me p { background: var(--grad); color: #fff; border-bottom-right-radius: 4px; }

.msg-avatar { width: 30px; height: 30px; border-radius: 50%; object-fit: cover; flex-shrink: 0; }

.chat-input {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 16px;
  border-top: 1px solid var(--border);
  background: #fff;
}

.chat-input input {
  flex: 1;
  border: none;
  outline: none;
  font-size: 14px;
  background: #F4EFF2;
  padding: 9px 14px;
  border-radius: 999px;
  color: var(--text);
}

.chat-emoji { font-size: 18px; }

.chat-input button {
  border: none;
  cursor: pointer;
  background: var(--grad);
  color: #fff;
  font-size: 13px;
  font-weight: 700;
  padding: 8px 16px;
  border-radius: 999px;
}

/* ============ 通用模块区 ============ */
.section { padding: 72px 0; }

.section-alt { background: var(--bg-alt); }

.sec-head { text-align: center; margin-bottom: 44px; }

.sec-head.left { text-align: left; margin-bottom: 20px; }

.sec-head h2 {
  font-size: 32px;
  font-weight: 800;
  color: var(--dark);
  margin-bottom: 10px;
}

.sec-head p { font-size: 15px; color: var(--text-light); }

/* ============ 通用卡片 ============ */
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: transform .3s, box-shadow .3s;
}

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

/* ============ 三步上手 ============ */
.steps-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.step-card { position: relative; padding: 36px 28px; text-align: center; }

.step-num {
  display: inline-block;
  font-size: 20px;
  font-weight: 800;
  color: var(--primary);
  background: var(--primary-soft);
  width: 46px;
  height: 46px;
  line-height: 46px;
  border-radius: 50%;
  margin-bottom: 18px;
}

.step-card h3 { font-size: 19px; color: var(--dark); margin-bottom: 10px; }

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

/* ============ 产品介绍 ============ */
.intro-grid {
  display: grid;
  grid-template-columns: 1fr 0.9fr;
  gap: 56px;
  align-items: center;
}

.intro-para { font-size: 15px; color: var(--text-light); margin: 18px 0 20px; max-width: 520px; }

.intro-list li {
  font-size: 15px;
  color: var(--text);
  padding: 9px 0;
  border-bottom: 1px dashed var(--border);
}

.intro-list li:last-child,
.scene-list li:last-child,
.persona-feats li:last-child { border-bottom: none; }

.intro-img img {
  width: 100%;
  max-width: 360px;
  margin: 0 auto;
  border-radius: 20px;
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
}

/* ============ 四大核心陪伴功能 ============ */
.feat-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 22px;
}

.feat-card { padding: 30px 24px; display: flex; flex-direction: column; }

.feat-icon {
  width: 54px;
  height: 54px;
  line-height: 54px;
  text-align: center;
  font-size: 26px;
  background: var(--grad);
  border-radius: 16px;
  margin-bottom: 18px;
}

.feat-card h3 { font-size: 18px; color: var(--dark); margin-bottom: 10px; }

.feat-card p { font-size: 14px; color: var(--text-light); flex: 1; }

.feat-solve {
  display: block;
  font-size: 12.5px;
  font-weight: 600;
  color: var(--primary-deep);
  background: #FFF0F5;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 9px 12px;
  margin-top: 16px;
  line-height: 1.6;
}

/* ============ 优势对比 ============ */
.compare-wrap { overflow-x: auto; -webkit-overflow-scrolling: touch; }

.compare-table {
  width: 100%;
  min-width: 680px;
  border-collapse: separate;
  border-spacing: 0;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}

.compare-table th,
.compare-table td {
  padding: 15px 20px;
  font-size: 14px;
  text-align: center;
  border-bottom: 1px solid var(--border);
}

.compare-table thead th {
  background: var(--grad);
  color: #fff;
  font-weight: 700;
  font-size: 15px;
}

.compare-table thead th:first-child { background: var(--dark); }

.compare-table tbody td:first-child {
  font-weight: 700;
  color: var(--dark);
  text-align: left;
  background: var(--bg);
}

.compare-table tbody tr:last-child td { border-bottom: none; }

.compare-table .col-best { color: var(--primary-deep); font-weight: 700; background: #FFF3F8; }

/* ============ 使用场景 ============ */
.scene-grid {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 48px;
  align-items: center;
  margin-bottom: 40px;
}

.scene-img img { width: 100%; border-radius: 20px; box-shadow: var(--shadow); border: 1px solid var(--border); }

.scene-list li {
  font-size: 15.5px;
  color: var(--text);
  padding: 13px 0;
  border-bottom: 1px dashed var(--border);
}

.scene-list li::first-letter { color: var(--primary); font-weight: 800; }

.scene-banner {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 22px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px 20px;
  font-size: 17px;
  font-weight: 700;
  color: var(--text-light);
  text-align: center;
}

.scene-banner b { color: var(--primary); }

.scene-banner .hl { color: var(--primary-deep); }

/* ============ 数据模块 ============ */
.data-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 22px;
}

.data-card { padding: 34px 20px; text-align: center; }

.data-num {
  display: block;
  font-size: 38px;
  font-weight: 800;
  color: transparent;
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  line-height: 1.2;
}

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

.data-card p { font-size: 14px; color: var(--text-light); margin-top: 6px; }

/* ============ 人设定制 ============ */
.persona-grid {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 56px;
  align-items: center;
}

.persona-para { font-size: 15px; color: var(--text-light); margin-bottom: 22px; }

.persona-feats li {
  font-size: 15px;
  color: var(--text);
  padding: 10px 0;
  border-bottom: 1px dashed var(--border);
}

.persona-feats b { color: var(--primary-deep); }

.persona-feats { margin-bottom: 28px; }

.persona-img img {
  width: 100%;
  max-width: 360px;
  margin: 0 auto;
  border-radius: 20px;
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
}

/* ============ 用户真实评价 ============ */
.review-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}

.review-card { padding: 26px 24px; }

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

.review-avatar {
  width: 46px;
  height: 46px;
  border-radius: 50%;
  background: var(--grad);
  color: #fff;
  font-size: 18px;
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.review-meta { display: flex; flex-direction: column; line-height: 1.4; }

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

.review-stars { font-size: 13px; color: #FFB400; letter-spacing: 2px; }

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

/* ============ 隐私安全 ============ */
.privacy-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}

.privacy-card { padding: 32px 26px; text-align: center; }

.privacy-icon { font-size: 34px; display: block; margin-bottom: 14px; }

.privacy-card h3 { font-size: 18px; color: var(--dark); margin-bottom: 10px; }

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

/* ============ 版本更新 ============ */
.version-card { padding: 34px 36px; max-width: 760px; margin: 0 auto; }

.version-top { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 10px; margin-bottom: 20px; padding-bottom: 16px; border-bottom: 1px dashed var(--border); }

.version-num { font-size: 20px; font-weight: 800; color: var(--primary-deep); }

.version-date { font-size: 13px; color: var(--text-light); }

.version-list li {
  font-size: 14.5px;
  color: var(--text);
  padding: 9px 0;
  padding-left: 22px;
  position: relative;
}

.version-list li::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 17px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--grad);
}

/* ============ FAQ 折叠问答 ============ */
.faq-list { max-width: 760px; margin: 0 auto; }

.faq-item {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  margin-bottom: 14px;
  overflow: hidden;
}

.faq-q {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  text-align: left;
  border: none;
  background: none;
  cursor: pointer;
  font-size: 15.5px;
  font-weight: 700;
  color: var(--dark);
  padding: 18px 22px;
}

.faq-arrow {
  font-size: 18px;
  color: var(--primary);
  transition: transform .3s;
  flex-shrink: 0;
}

.faq-item.open .faq-arrow { transform: rotate(45deg); }

.faq-a {
  max-height: 0;
  overflow: hidden;
  transition: max-height .35s ease;
}

.faq-a p { font-size: 14px; color: var(--text-light); padding: 0 22px 20px; }

/* ============ 下载区域 ============ */
.download-sec {
  background: radial-gradient(900px 400px at 50% 0%, rgba(255, 163, 192, 0.4), transparent 60%),
              radial-gradient(700px 380px at 80% 100%, rgba(157, 107, 255, 0.2), transparent 55%);
}

.download-sec h1 {
  text-align: center;
  font-size: 38px;
  font-weight: 800;
  color: var(--dark);
  margin-bottom: 12px;
}

.download-meta { text-align: center; font-size: 13px; color: var(--text-light); margin-bottom: 34px; }

.download-btns {
  display: flex;
  justify-content: center;
  gap: 20px;
  flex-wrap: wrap;
}

.btn-download {
  font-size: 16px;
  font-weight: 700;
  text-align: center;
  color: #fff;
  background: var(--grad);
  padding: 16px 46px;
  border-radius: 999px;
  box-shadow: 0 10px 26px rgba(255, 92, 138, 0.32);
  transition: transform .25s, box-shadow .25s;
}

.btn-download.alt { background: var(--dark); box-shadow: 0 10px 24px rgba(59, 34, 51, 0.28); }

.btn-download:hover { transform: translateY(-3px); box-shadow: 0 14px 32px rgba(255, 92, 138, 0.42); }

.btn-download.alt:hover { box-shadow: 0 14px 30px rgba(59, 34, 51, 0.38); }

.download-tip { text-align: center; font-size: 14px; color: var(--text-light); margin-top: 26px; }

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

.footer p { text-align: center; font-size: 13px; color: rgba(255, 255, 255, 0.75); }

.footer a { color: #fff; }

.footer a:hover { opacity: 0.85; }

/* ============ 返回顶部 ============ */
.to-top {
  position: fixed;
  right: 26px;
  bottom: 30px;
  z-index: 90;
  width: 46px;
  height: 46px;
  line-height: 46px;
  text-align: center;
  font-size: 20px;
  font-weight: 800;
  color: #fff;
  background: var(--grad);
  border-radius: 50%;
  box-shadow: 0 8px 22px rgba(255, 92, 138, 0.35);
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: opacity .3s, transform .3s, visibility .3s;
}

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

.to-top:hover { transform: translateY(-4px); }

/* ============ 滚动入场动画 ============ */
.reveal { opacity: 0; transform: translateY(26px); transition: opacity .6s ease, transform .6s ease; }

.reveal.visible { opacity: 1; transform: none; }

/* ============ 平板适配（1024px 以下） ============ */
@media (max-width: 1024px) {
  .nav-menu { display: none; }

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

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

/* ============ 手机端适配（768px 以下） ============ */
@media (max-width: 768px) {
  .wrap { padding: 0 20px; }

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

  .logo { font-size: 21px; }

  .btn-nav { padding: 7px 14px; }

  .section { padding: 54px 0; }

  .sec-head { margin-bottom: 32px; }

  .sec-head h2 { font-size: 25px; }

  /* Hero 上下排列 */
  .hero { padding: calc(var(--nav-h) + 34px) 0 50px; }

  .hero-grid { grid-template-columns: 1fr; gap: 38px; }

  .hero h1 { font-size: 30px; }

  .hero-desc { font-size: 15px; }

  .chat-window { margin: 0 auto; max-width: 100%; }

  .chat-body { min-height: 280px; }

  .btn-hero { display: block; width: 100%; }

  .persona-row { text-align: center; }

  .persona-item img { width: 56px; height: 56px; }

  .persona-list { gap: 12px; justify-content: center; }

  /* 三步上手 */
  .steps-grid { grid-template-columns: 1fr; gap: 16px; }

  /* 产品介绍 / 人设定制 上下排列 */
  .intro-grid, .persona-grid { grid-template-columns: 1fr; gap: 32px; }

  /* 核心功能 */
  .feat-grid { grid-template-columns: 1fr; gap: 16px; }

  /* 使用场景 */
  .scene-grid { grid-template-columns: 1fr; gap: 28px; }

  .scene-banner { flex-direction: column; gap: 8px; font-size: 15px; }

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

  .data-num { font-size: 30px; }

  /* 用户评价 */
  .review-grid { grid-template-columns: 1fr; gap: 16px; }

  /* 隐私 */
  .privacy-grid { grid-template-columns: 1fr; gap: 16px; }

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

  .version-top { flex-direction: column; align-items: flex-start; }

  /* FAQ */
  .faq-q { font-size: 14.5px; padding: 16px 16px; }

  .faq-a p { padding: 0 16px 18px; }

  /* 下载区域 */
  .download-sec h1 { font-size: 27px; }

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

  .download-btns { flex-direction: column; align-items: stretch; gap: 14px; }

  .btn-download { padding: 15px 20px; }

  .to-top { right: 16px; bottom: 22px; width: 42px; height: 42px; line-height: 42px; }
}