/* ================== 基础 ================== */
:root {
  --teal: #6BA8A4;
  --purple: #8B8EC9;
  --dark: #1E2030;
  --dark-2: #2D3142;
  --muted: #6B6F82;
  --light: #F7F8FC;
  --white: #FFFFFF;
  --shadow: 0 8px 30px rgba(30,32,48,0.10);
  --shadow-hover: 0 20px 50px rgba(30,32,48,0.18);
  --radius: 16px;
  --radius-sm: 10px;
  --maxw: 1120px;
  --grad: linear-gradient(135deg, var(--teal) 0%, var(--purple) 100%);
  --grad-soft: linear-gradient(135deg, rgba(107,168,164,0.12) 0%, rgba(139,142,201,0.12) 100%);
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
[id] { scroll-margin-top: 76px; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;
  color: var(--dark-2);
  line-height: 1.6;
  background: var(--white);
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }

.container {
  width: 92%;
  max-width: var(--maxw);
  margin: 0 auto;
}
.container-narrow { max-width: 820px; }

/* ================== 导航 ================== */
.navbar {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 1000;
  background: rgba(255,255,255,0.85);
  backdrop-filter: saturate(140%) blur(14px);
  border-bottom: 1px solid rgba(107,168,164,0.10);
  transition: box-shadow .3s ease;
}
.navbar.scrolled { box-shadow: var(--shadow); }

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

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  font-size: 1.25rem;
  letter-spacing: -0.5px;
}
.brand-logo {
  width: 34px; height: 34px;
  border-radius: 10px;
  background: var(--grad);
}
.brand-name {
  background: var(--grad);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 6px;
}
.nav-links a {
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  font-size: .92rem;
  color: var(--muted);
  transition: all .2s ease;
}
.nav-links a:hover { color: var(--dark-2); background: var(--light); }
.nav-links .nav-cta {
  background: var(--grad);
  color: var(--white) !important;
  font-weight: 600;
  margin-left: 6px;
}
.nav-links .nav-cta:hover { opacity: .9; }

.nav-toggle {
  display: none;
  width: 40px; height: 40px;
  border: none; background: none;
  cursor: pointer; flex-direction: column;
  justify-content: center; align-items: center; gap: 5px;
}
.nav-toggle span {
  display: block; width: 22px; height: 2px;
  background: var(--dark-2);
  border-radius: 2px; transition: .3s;
}

/* ================== 首屏 ================== */
.hero {
  position: relative;
  padding: 140px 0 110px;
  overflow: hidden;
}
.hero-bg {
  position: absolute; inset: 0;
  background: radial-gradient(1200px 600px at 110% 10%, rgba(139,142,201,0.14), transparent),
              radial-gradient(1000px 500px at -10% 80%, rgba(107,168,164,0.12), transparent);
  pointer-events: none;
}

.hero-inner {
  display: grid;
  grid-template-columns: 1.05fr 1fr;
  gap: 64px;
  align-items: center;
}

.hero-badges {
  display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 20px;
}
.badge {
  display: inline-block;
  padding: 5px 12px;
  border-radius: 999px;
  font-size: .82rem;
  font-weight: 600;
}
.badge-version { background: var(--grad); color: var(--white); }
.badge-date { background: var(--light); color: var(--muted); }

.hero-text h1 {
  font-size: 3.2rem;
  line-height: 1.12;
  letter-spacing: -1.5px;
  color: var(--dark);
  margin-bottom: 18px;
}
.hero-text h1 em {
  font-style: normal;
  background: var(--grad);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-desc {
  font-size: 1.08rem;
  color: var(--muted);
  max-width: 520px;
  margin-bottom: 28px;
}
.hero-actions {
  display: flex; gap: 12px; flex-wrap: wrap; margin-bottom: 22px;
}
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  padding: 12px 28px;
  border-radius: 12px;
  font-weight: 700; font-size: 1rem;
  transition: transform .2s, box-shadow .2s;
}
.btn:hover { transform: translateY(-1px); }
.btn-primary {
  background: var(--grad);
  color: var(--white);
  box-shadow: 0 10px 28px rgba(107,168,164,0.30);
}
.btn-ghost {
  background: var(--white);
  color: var(--dark-2);
  border: 1px solid rgba(107,168,164,0.25);
}
.hero-meta {
  display: flex; align-items: center; gap: 10px;
  font-size: .86rem; color: var(--muted);
}
.dot { width: 4px; height: 4px; border-radius: 50%; background: var(--teal); }

/* 截图区 */
.hero-shots {
  position: relative;
  width: 100%; height: 460px;
  perspective: 1200px;
}
.hero-shots .shot {
  position: absolute;
  width: 52%;
  border-radius: 20px;
  overflow: hidden;
  background: linear-gradient(135deg, #EAF1F1, #E8E9F5);
  box-shadow: var(--shadow);
  transition: transform .55s cubic-bezier(.23,1,.32,1), z-index 0s, box-shadow .4s ease;
  cursor: pointer;
  user-select: none;
}
.hero-shots .shot img {
  width: 100%; height: auto;
  aspect-ratio: 9 / 19;
  background: linear-gradient(135deg, #D4E4E3, #D8D9EC);
  border-radius: 20px;
}
.hero-shots .shot figcaption {
  position: absolute; bottom: 14px; left: 14px; right: 14px;
  padding: 8px 12px;
  background: rgba(30,32,48,0.65);
  backdrop-filter: blur(6px);
  color: #fff;
  font-size: .84rem;
  font-weight: 600;
  border-radius: 10px;
  text-align: center;
  opacity: 0;
  transform: translateY(6px);
  transition: opacity .35s, transform .35s;
}

/* 初始叠放 */
.shot-1 { left: 0; top: 0; z-index: 2; transform: rotateY(8deg) rotateZ(-2deg) translateZ(20px); }
.shot-2 { left: 28%; top: 40px; z-index: 3; transform: rotateY(0deg) rotateZ(0deg) translateZ(40px); }
.shot-3 { left: 48%; top: 80px; z-index: 2; transform: rotateY(-8deg) rotateZ(2deg) translateZ(20px); }

/* 悬停交互 */
.hero-shots .shot:hover {
  z-index: 10;
  transform: translateZ(80px) scale(1.06) rotateY(0deg) rotateZ(0deg) !important;
  box-shadow: var(--shadow-hover);
}
.hero-shots .shot:hover figcaption { opacity: 1; transform: translateY(0); }

/* ================== 信息条 ================== */
.strip {
  padding: 30px 0;
  border-top: 1px solid rgba(107,168,164,0.08);
  border-bottom: 1px solid rgba(107,168,164,0.08);
  background: var(--light);
}
.strip-inner {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}
.strip-item {
  text-align: center;
}
.strip-item strong {
  display: block;
  font-size: 1.35rem;
  color: var(--dark);
  letter-spacing: -0.5px;
}
.strip-item span {
  font-size: .84rem;
  color: var(--muted);
}

/* ================== 通用区块 ================== */
.section {
  padding: 90px 0;
}
.section-alt { background: var(--light); }

.section-title {
  font-size: 2.1rem;
  text-align: center;
  color: var(--dark);
  letter-spacing: -1px;
  margin-bottom: 8px;
}
.section-sub {
  text-align: center;
  color: var(--muted);
  margin-bottom: 50px;
  font-size: 1.02rem;
}

/* ================== 功能 ================== */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.feature-card {
  background: var(--white);
  border: 1px solid rgba(107,168,164,0.10);
  border-radius: var(--radius);
  padding: 28px;
  transition: transform .3s, box-shadow .3s, border-color .3s;
}
.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
  border-color: rgba(107,168,164,0.22);
}
.feature-icon {
  width: 44px; height: 44px;
  border-radius: 12px;
  display: flex; align-items: center; justify-content: center;
  background: var(--grad-soft);
  color: var(--teal);
  font-size: 1.2rem;
  margin-bottom: 16px;
}
.feature-card h3 {
  font-size: 1.1rem;
  margin-bottom: 8px;
  color: var(--dark);
}
.feature-card p {
  font-size: .94rem;
  color: var(--muted);
  line-height: 1.65;
}

/* ================== 评价 ================== */
.review-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}
.review-card {
  background: var(--white);
  border-radius: var(--radius);
  padding: 26px;
  box-shadow: var(--shadow);
  display: flex; flex-direction: column; justify-content: space-between;
  transition: transform .3s, box-shadow .3s;
}
.review-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-hover); }
.review-text {
  font-size: .98rem;
  color: var(--dark-2);
  line-height: 1.7;
  margin-bottom: 20px;
}
.review-user {
  display: flex; align-items: center; gap: 12px;
}
.avatar {
  width: 42px; height: 42px;
  border-radius: 50%;
  background: var(--grad);
  color: #fff;
  font-weight: 700;
  display: flex; align-items: center; justify-content: center;
  font-size: .95rem;
  flex-shrink: 0;
}
.review-user strong { display: block; font-size: .95rem; color: var(--dark); }
.review-user span { font-size: .82rem; color: var(--muted); }

/* ================== FAQ ================== */
.faq-list { display: flex; flex-direction: column; gap: 12px; }
.faq-item {
  background: var(--white);
  border: 1px solid rgba(107,168,164,0.10);
  border-radius: var(--radius-sm);
  overflow: hidden;
  transition: border-color .3s;
}
.faq-item.open { border-color: rgba(107,168,164,0.25); }

.faq-q {
  width: 100%; text-align: left;
  padding: 18px 22px;
  background: none; border: none;
  font-size: 1rem; font-weight: 700; color: var(--dark);
  cursor: pointer; display: flex; align-items: center; justify-content: space-between;
}
.faq-q i {
  display: inline-block; width: 10px; height: 10px;
  border-right: 2px solid var(--muted);
  border-bottom: 2px solid var(--muted);
  transform: rotate(45deg);
  transition: transform .3s;
  flex-shrink: 0;
}
.faq-item.open .faq-q i { transform: rotate(-135deg); border-color: var(--teal); }

.faq-a {
  max-height: 0; overflow: hidden;
  transition: max-height .4s cubic-bezier(.23,1,.32,1), padding .3s;
  padding: 0 22px;
  color: var(--muted);
  font-size: .95rem; line-height: 1.7;
}
.faq-item.open .faq-a {
  max-height: 220px;
  padding-bottom: 18px;
}

/* ================== 下载 ================== */
.download {
  position: relative;
  padding: 100px 0 90px;
  overflow: hidden;
}
.download::before {
  content: '';
  position: absolute; inset: 0;
  background: var(--grad);
  opacity: .95;
}
.download::after {
  content: '';
  position: absolute; inset: 0;
  background: radial-gradient(900px 400px at 10% 10%, rgba(255,255,255,0.14), transparent),
              radial-gradient(800px 350px at 90% 90%, rgba(255,255,255,0.10), transparent);
}

.download-inner {
  position: relative; z-index: 2;
  text-align: center; color: var(--white);
}
.download-logo {
  width: 64px; height: 64px;
  border-radius: 18px;
  background: rgba(255,255,255,0.20);
  margin: 0 auto 20px;
  backdrop-filter: blur(4px);
}
.download h2 { font-size: 2.2rem; letter-spacing: -1px; margin-bottom: 10px; }
.download-sub { opacity: .9; font-size: 1.05rem; margin-bottom: 32px; }
.download-sub strong { opacity: 1; font-weight: 700; }

.download-btns {
  display: flex; justify-content: center; gap: 16px; flex-wrap: wrap;
}
.dl-btn {
  display: inline-flex; align-items: center; gap: 14px;
  padding: 16px 28px;
  background: var(--white);
  color: var(--dark);
  border-radius: 16px;
  font-weight: 700;
  transition: transform .25s, box-shadow .25s;
  box-shadow: 0 12px 32px rgba(30,32,48,0.18);
  min-width: 240px;
}
.dl-btn:hover { transform: translateY(-3px); box-shadow: 0 20px 48px rgba(30,32,48,0.26); }
.dl-icon { width: 30px; height: 30px; flex-shrink: 0; }
.dl-btn:nth-child(1) .dl-icon { color: #3DDC84; } /* Android 品牌绿 */
.dl-btn:nth-child(2) .dl-icon { color: #1E2030; }  /* Apple 深灰黑 */
.dl-text { display: flex; flex-direction: column; text-align: left; }
.dl-text small { font-size: .78rem; color: var(--muted); font-weight: 500; }
.dl-text strong { font-size: 1.05rem; color: var(--dark); }

.download-note {
  margin-top: 22px;
  font-size: .88rem;
  opacity: .8;
}

/* ================== 页脚 ================== */
.footer {
  padding: 50px 0 36px;
  text-align: center;
  background: var(--dark);
  color: rgba(255,255,255,0.55);
  font-size: .9rem;
}
.footer .brand { justify-content: center; margin-bottom: 12px; }
.footer .brand-logo { background: rgba(255,255,255,0.12); }
.footer .brand-name { background: none; -webkit-text-fill-color: #fff; color: #fff; }
.footer-copy { margin-top: 16px; opacity: .7; font-size: .82rem; }

/* ================== 滚动显现 ================== */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity .65s ease, transform .65s cubic-bezier(.23,1,.32,1);
}
.reveal.visible { opacity: 1; transform: translateY(0); }

/* ================== 响应式 ================== */
@media (max-width: 980px) {
  .hero-inner { grid-template-columns: 1fr; gap: 48px; text-align: center; }
  .hero-text h1 { font-size: 2.4rem; }
  .hero-desc { margin-left: auto; margin-right: auto; }
  .hero-actions { justify-content: center; }
  .hero-meta { justify-content: center; }
  .hero-shots { height: 380px; margin: 0 auto; max-width: 480px; }
  .feature-grid { grid-template-columns: repeat(2, 1fr); }
  .review-grid { grid-template-columns: 1fr; }
  .strip-inner { grid-template-columns: repeat(2, 1fr); gap: 18px; }
}

@media (max-width: 640px) {
  .nav-links {
    position: absolute; top: 64px; left: 0; right: 0;
    background: rgba(255,255,255,0.96);
    backdrop-filter: blur(14px);
    flex-direction: column; align-items: stretch; gap: 0;
    padding: 10px 20px 18px;
    border-bottom: 1px solid rgba(107,168,164,0.10);
    transform: translateY(-8px);
    opacity: 0; pointer-events: none;
    transition: opacity .25s, transform .25s;
  }
  .nav-links.open { opacity: 1; pointer-events: auto; transform: translateY(0); }
  .nav-links a { padding: 10px 8px; text-align: center; }
  .nav-links .nav-cta { margin-left: 0; margin-top: 6px; }
  .nav-toggle { display: flex; }

  .hero { padding: 110px 0 70px; }
  .hero-text h1 { font-size: 1.9rem; }
  .hero-shots { height: 300px; }
  .shot { width: 58% !important; }
  .shot-1 { left: 2% !important; top: 0 !important; }
  .shot-2 { left: 22% !important; top: 30px !important; }
  .shot-3 { left: 40% !important; top: 60px !important; }

  .feature-grid { grid-template-columns: 1fr; }
  .strip-inner { grid-template-columns: repeat(2, 1fr); }
  .section { padding: 64px 0; }
  .section-title { font-size: 1.7rem; }

  .download { padding: 72px 0 60px; }
  .download h2 { font-size: 1.7rem; }
  .dl-btn { min-width: auto; width: 100%; justify-content: center; }
}