/* ============================================================
   CSS 变量 & Reset
   ============================================================ */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --primary:        #2563eb;
  --primary-dark:   #1d4ed8;
  --primary-deeper: #1e3a8a;
  --primary-light:  #3b82f6;
  --primary-lighter:#dbeafe;
  --accent:         #f59e0b;
  --text-dark:      #111827;
  --text-medium:    #374151;
  --text-light:     #6b7280;
  --text-lighter:   #9ca3af;
  --bg-white:       #ffffff;
  --bg-light:       #f8fafc;
  --bg-gray:        #f1f5f9;
  --border:         #e5e7eb;
  --shadow-sm:      0 1px 3px rgba(0,0,0,.08), 0 1px 2px rgba(0,0,0,.05);
  --shadow:         0 4px 12px rgba(0,0,0,.08);
  --shadow-lg:      0 10px 30px rgba(0,0,0,.10);
  --shadow-xl:      0 20px 50px rgba(0,0,0,.12);
  --radius:         12px;
  --radius-lg:      20px;
  --radius-full:    9999px;
  --transition:     0.28s cubic-bezier(.4,0,.2,1);
  --nav-height:     64px;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Helvetica Neue",
               "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  color: var(--text-dark);
  background: var(--bg-white);
  line-height: 1.6;
  overflow-x: hidden;
}

img { display: block; max-width: 100%; }
a  { color: inherit; text-decoration: none; }
ul { list-style: none; }
button { border: none; background: none; cursor: pointer; font-family: inherit; }

.container {
  width: 100%;
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ============================================================
   Scroll Animations
   ============================================================ */
[data-aos] {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
[data-aos].aos-animate {
  opacity: 1;
  transform: translateY(0);
}
[data-aos][data-aos-delay="60"]  { transition-delay: .06s; }
[data-aos][data-aos-delay="100"] { transition-delay: .10s; }
[data-aos][data-aos-delay="120"] { transition-delay: .12s; }
[data-aos][data-aos-delay="200"] { transition-delay: .20s; }

/* ============================================================
   Section header (shared)
   ============================================================ */
.section-header { text-align: center; margin-bottom: 56px; }
.section-title  { font-size: 2rem; font-weight: 700; color: var(--text-dark); margin-bottom: 12px; }
.section-subtitle {
  font-size: 1.05rem;
  color: var(--text-light);
}

/* ============================================================
   Navbar
   ============================================================ */
.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  height: var(--nav-height);
  background: transparent;
  transition: background var(--transition), box-shadow var(--transition);
}
.navbar.scrolled {
  background: rgba(255,255,255,.95);
  backdrop-filter: blur(12px);
  box-shadow: 0 1px 0 rgba(0,0,0,.08);
}
.navbar.scrolled .nav-link { color: var(--text-medium); }
.navbar.scrolled .nav-link:hover { color: var(--primary); }
.navbar.scrolled .nav-name { color: var(--text-dark); }

.nav-container {
  display: flex;
  align-items: center;
  height: var(--nav-height);
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 24px;
  gap: 24px;
}
.nav-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}
.nav-logo {
  width: 36px;
  height: 36px;
  border-radius: 8px;
  object-fit: cover;
}
.nav-name {
  font-size: 1.05rem;
  font-weight: 700;
  color: #fff;
  transition: color var(--transition);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-left: auto;
}
.nav-link {
  padding: 6px 14px;
  border-radius: var(--radius-full);
  font-size: .95rem;
  font-weight: 500;
  color: rgba(255,255,255,.85);
  transition: color var(--transition), background var(--transition);
}
.nav-link:hover, .nav-link.active {
  color: #fff;
  background: rgba(255,255,255,.12);
}
.navbar.scrolled .nav-link.active {
  color: var(--primary);
  background: var(--primary-lighter);
}

.btn-nav-cta {
  flex-shrink: 0;
  padding: 8px 20px;
  background: #fff;
  color: var(--primary);
  border-radius: var(--radius-full);
  font-size: .9rem;
  font-weight: 600;
  transition: background var(--transition), box-shadow var(--transition), transform var(--transition);
}
.btn-nav-cta:hover {
  background: var(--primary-lighter);
  box-shadow: 0 4px 12px rgba(37,99,235,.25);
  transform: translateY(-1px);
}
.navbar.scrolled .btn-nav-cta {
  background: var(--primary);
  color: #fff;
}
.navbar.scrolled .btn-nav-cta:hover {
  background: var(--primary-dark);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 4px;
  margin-left: 8px;
}
.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: #fff;
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
}
.navbar.scrolled .nav-toggle span { background: var(--text-dark); }

/* ============================================================
   Hero Section
   ============================================================ */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  background: linear-gradient(135deg, #1e3a8a 0%, #1d4ed8 45%, #2563eb 70%, #3b82f6 100%);
}

/* Decorative blobs */
.hero-bg { position: absolute; inset: 0; overflow: hidden; pointer-events: none; }
.hero-blob {
  position: absolute;
  border-radius: 50%;
  filter: blur(60px);
  opacity: .35;
}
.blob-1 {
  width: 600px; height: 600px;
  background: #1e40af;
  top: -200px; right: -150px;
}
.blob-2 {
  width: 400px; height: 400px;
  background: #3b82f6;
  bottom: -100px; left: -100px;
}
.blob-3 {
  width: 300px; height: 300px;
  background: #60a5fa;
  top: 40%; right: 15%;
  opacity: .2;
}

.hero-content {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: calc(var(--nav-height) + 24px) 24px 40px;
  max-width: 680px;
}

.hero-logo {
  width: 96px;
  height: 96px;
  border-radius: 22px;
  object-fit: cover;
  box-shadow: 0 12px 40px rgba(0,0,0,.25);
  margin-bottom: 20px;
}

.hero-title {
  font-size: clamp(2.4rem, 6vw, 3.6rem);
  font-weight: 800;
  color: #fff;
  letter-spacing: .02em;
  margin-bottom: 14px;
  line-height: 1.15;
}

.hero-subtitle {
  font-size: clamp(1.05rem, 3vw, 1.3rem);
  color: rgba(255,255,255,.9);
  font-weight: 500;
  margin-bottom: 10px;
}

.hero-desc {
  font-size: .95rem;
  color: rgba(255,255,255,.65);
  line-height: 1.7;
  margin-bottom: 36px;
}

/* Download buttons */
.hero-download { width: 100%; display: flex; flex-direction: column; align-items: center; gap: 16px; margin-bottom: 48px; }

.download-loading, .dl-loading {
  display: flex;
  align-items: center;
  gap: 10px;
  color: rgba(255,255,255,.75);
  font-size: .9rem;
}

.spinner {
  width: 18px; height: 18px;
  border: 2px solid rgba(255,255,255,.3);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin .8s linear infinite;
}
.spinner-white { border-color: rgba(255,255,255,.25); border-top-color: #fff; }

@keyframes spin { to { transform: rotate(360deg); } }

.download-btns, .dl-btns {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  justify-content: center;
}

.btn-dl {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 22px;
  border-radius: var(--radius);
  font-size: .95rem;
  font-weight: 600;
  transition: transform var(--transition), box-shadow var(--transition), background var(--transition);
  min-width: 160px;
}
.btn-dl:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0,0,0,.2);
}
.btn-dl .btn-icon {
  width: 24px; height: 24px;
  flex-shrink: 0;
}
.btn-dl .btn-text { display: flex; flex-direction: column; line-height: 1.2; }
.btn-dl .btn-text small { font-size: .72rem; font-weight: 400; opacity: .8; }
.btn-dl .btn-text strong { font-size: .98rem; }

.btn-ios  { background: #fff; color: var(--text-dark); }
.btn-ios:hover { background: #f0f4ff; }

.btn-android { background: rgba(255,255,255,.15); color: #fff; border: 1px solid rgba(255,255,255,.3); }
.btn-android:hover { background: rgba(255,255,255,.22); }

/* contact tip */
.download-contact { text-align: center; }
.contact-tip { color: rgba(255,255,255,.7); font-size: .9rem; margin-bottom: 16px; }
.qr-placeholder {
  width: 120px;
  height: 120px;
  background: rgba(255,255,255,.12);
  border: 1px solid rgba(255,255,255,.25);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto;
}
.qr-inner { display: flex; flex-direction: column; align-items: center; gap: 6px; color: rgba(255,255,255,.6); font-size: .7rem; }
.qr-inner svg { width: 56px; height: 56px; }

/* Stats */
.hero-stats {
  display: flex;
  align-items: center;
  gap: 0;
  background: rgba(255,255,255,.12);
  border: 1px solid rgba(255,255,255,.2);
  backdrop-filter: blur(10px);
  border-radius: var(--radius-lg);
  padding: 20px 40px;
  gap: 32px;
}
.stat-item { display: flex; flex-direction: column; align-items: center; }
.stat-num   { font-size: 1.6rem; font-weight: 800; color: #fff; line-height: 1; }
.stat-label { font-size: .8rem; color: rgba(255,255,255,.65); margin-top: 4px; }
.stat-divider { width: 1px; height: 32px; background: rgba(255,255,255,.2); }

/* Scroll indicator */
.hero-scroll {
  position: absolute;
  bottom: 28px;
  left: 50%;
  transform: translateX(-50%);
}
.scroll-dot {
  width: 6px; height: 6px;
  background: rgba(255,255,255,.6);
  border-radius: 50%;
  animation: scrollBounce 1.6s ease-in-out infinite;
}
@keyframes scrollBounce {
  0%, 100% { transform: translateY(0); opacity: 1; }
  50%       { transform: translateY(8px); opacity: .4; }
}

/* ============================================================
   Mission Section
   ============================================================ */
.mission {
  padding: 100px 0;
  background: var(--bg-white);
}

.mission-flow {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 48px;
}

.mission-step {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: 28px 24px;
  border-radius: var(--radius-lg);
  background: var(--bg-light);
  border: 1.5px solid var(--border);
  min-width: 180px;
  max-width: 210px;
  flex: 1;
  transition: box-shadow var(--transition), transform var(--transition);
}
.mission-step:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
}
.mission-step.active {
  border-color: var(--primary);
  background: linear-gradient(160deg, #eff6ff, #f0f9ff);
}

.mission-icon {
  width: 64px; height: 64px;
  border-radius: 50%;
  background: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  box-shadow: var(--shadow-sm);
  margin-bottom: 14px;
}
.mission-step.active .mission-icon {
  background: var(--primary-lighter);
}

.mission-step-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-dark);
  margin-bottom: 6px;
}
.mission-step.active .mission-step-title { color: var(--primary); }

.mission-step-desc {
  font-size: .85rem;
  color: var(--text-light);
  line-height: 1.6;
}

.mission-arrow {
  flex-shrink: 0;
  padding: 0 4px;
}
.mission-arrow svg { width: 40px; height: 16px; }

.mission-phases {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

.phase-card {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 20px 24px;
  border-radius: var(--radius);
  flex: 1;
  min-width: 280px;
  max-width: 480px;
  font-size: .95rem;
  color: var(--text-medium);
  line-height: 1.65;
}
.phase-now   { background: #eff6ff; border: 1px solid #bfdbfe; }
.phase-future{ background: #f0fdf4; border: 1px solid #bbf7d0; }

.phase-tag {
  flex-shrink: 0;
  padding: 3px 10px;
  border-radius: var(--radius-full);
  font-size: .78rem;
  font-weight: 600;
  white-space: nowrap;
  margin-top: 2px;
}
.tag-now    { background: var(--primary); color: #fff; }
.tag-future { background: #16a34a; color: #fff; }

/* ============================================================
   Features Section
   ============================================================ */
.features {
  padding: 100px 0;
  background: var(--bg-light);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.feature-card {
  background: var(--bg-white);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  border: 1.5px solid var(--border);
  transition: box-shadow var(--transition), transform var(--transition), border-color var(--transition);
}
.feature-card:hover {
  box-shadow: var(--shadow-xl);
  transform: translateY(-6px);
  border-color: transparent;
}

.feature-icon {
  width: 52px; height: 52px;
  border-radius: 14px;
  background: var(--icon-bg, #eff6ff);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 18px;
}
.feature-icon svg {
  width: 26px; height: 26px;
  stroke: var(--icon-color, #2563eb);
}

.feature-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-dark);
  margin-bottom: 10px;
}

.feature-desc {
  font-size: .9rem;
  color: var(--text-light);
  line-height: 1.7;
}

/* ============================================================
   Download Section
   ============================================================ */
.download {
  position: relative;
  padding: 100px 0;
  overflow: hidden;
  background: linear-gradient(135deg, #1e3a8a 0%, #2563eb 60%, #3b82f6 100%);
  color: #fff;
}
.download-bg { position: absolute; inset: 0; pointer-events: none; }
.dl-blob {
  position: absolute;
  border-radius: 50%;
  filter: blur(60px);
  opacity: .3;
}
.dl-blob-1 { width: 500px; height: 500px; background: #1e40af; top: -150px; left: -100px; }
.dl-blob-2 { width: 400px; height: 400px; background: #60a5fa; bottom: -100px; right: -50px; }

.download-inner {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  gap: 80px;
}

.download-text { flex: 1; }
.download-title {
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  font-weight: 800;
  margin-bottom: 14px;
}
.download-desc {
  font-size: 1.05rem;
  color: rgba(255,255,255,.8);
  line-height: 1.7;
  margin-bottom: 28px;
}
.download-features {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 36px;
}
.download-features li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: .95rem;
  color: rgba(255,255,255,.85);
}
.download-features li svg { width: 20px; height: 20px; color: #86efac; flex-shrink: 0; }

/* Large DL buttons */
.dl-btns { display: flex; gap: 14px; flex-wrap: wrap; }
.btn-dl-lg {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 13px 26px;
  border-radius: var(--radius);
  font-size: 1rem;
  font-weight: 600;
  transition: transform var(--transition), box-shadow var(--transition);
}
.btn-dl-lg:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 30px rgba(0,0,0,.25);
}
.btn-dl-lg svg { width: 22px; height: 22px; flex-shrink: 0; }
.btn-ios-lg     { background: #fff; color: var(--text-dark); }
.btn-ios-lg:hover { background: #f0f4ff; }
.btn-android-lg { background: rgba(255,255,255,.14); color: #fff; border: 1.5px solid rgba(255,255,255,.35); }
.btn-android-lg:hover { background: rgba(255,255,255,.22); }

.dl-contact { color: rgba(255,255,255,.65); font-size: .9rem; }

/* QR */
.download-qr { flex-shrink: 0; }
.qr-box {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
}
.qr-frame {
  width: 140px; height: 140px;
  background: #fff;
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 12px;
  box-shadow: 0 8px 32px rgba(0,0,0,.2);
}
.qr-frame svg { width: 100%; height: 100%; }
.qr-label { font-size: .95rem; font-weight: 600; color: #fff; }
.qr-sub   { font-size: .8rem; color: rgba(255,255,255,.6); }

/* ============================================================
   FAQ Section
   ============================================================ */
.faq { padding: 100px 0; background: var(--bg-white); }

.faq-list {
  max-width: 720px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 0;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.faq-item { border-bottom: 1px solid var(--border); }
.faq-item:last-child { border-bottom: none; }

.faq-question {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px;
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-dark);
  text-align: left;
  gap: 12px;
  transition: background var(--transition);
}
.faq-question:hover { background: var(--bg-light); }
.faq-question[aria-expanded="true"] { color: var(--primary); background: #eff6ff; }

.faq-icon {
  width: 18px; height: 18px;
  color: var(--text-lighter);
  flex-shrink: 0;
  transition: transform var(--transition);
}
.faq-question[aria-expanded="true"] .faq-icon {
  transform: rotate(180deg);
  color: var(--primary);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease, padding 0.35s ease;
}
.faq-answer.open {
  max-height: 200px;
  padding: 0 24px 20px;
}
.faq-answer p {
  font-size: .95rem;
  color: var(--text-medium);
  line-height: 1.7;
}

/* ============================================================
   Footer
   ============================================================ */
.footer {
  background: #0f172a;
  color: #94a3b8;
  padding: 60px 0 0;
}

.footer-top {
  display: flex;
  align-items: flex-start;
  gap: 64px;
  padding-bottom: 48px;
  border-bottom: 1px solid rgba(255,255,255,.07);
  flex-wrap: wrap;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 14px;
  flex-shrink: 0;
}
.footer-logo {
  width: 48px; height: 48px;
  border-radius: 12px;
  object-fit: cover;
}
.footer-brand-name   { font-size: 1.1rem; font-weight: 700; color: #f1f5f9; }
.footer-brand-slogan { font-size: .82rem; color: #64748b; margin-top: 4px; max-width: 220px; }

.footer-links-group {
  display: flex;
  gap: 48px;
  flex-wrap: wrap;
  margin-left: auto;
}
.footer-col-title {
  font-size: .85rem;
  font-weight: 600;
  color: #cbd5e1;
  text-transform: uppercase;
  letter-spacing: .05em;
  margin-bottom: 14px;
}
.footer-col ul { display: flex; flex-direction: column; gap: 8px; }
.footer-col ul li a {
  font-size: .9rem;
  color: #64748b;
  transition: color var(--transition);
}
.footer-col ul li a:hover { color: #f1f5f9; }

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 0;
  flex-wrap: wrap;
  gap: 12px;
}
.footer-company { font-size: .85rem; color: #475569; }

.footer-icp {
  display: flex;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
}
.icp-link {
  font-size: .82rem;
  color: #475569;
  transition: color var(--transition);
}
.icp-link:hover { color: #93c5fd; text-decoration: underline; }
.beian-link {
  display: flex;
  align-items: center;
  gap: 5px;
  font-size: .82rem;
  color: #475569;
  transition: color var(--transition);
}
.beian-link:hover { color: #93c5fd; }
.beian-icon { width: 16px; height: 16px; display: inline-block; }

/* ============================================================
   Responsive
   ============================================================ */
@media (max-width: 960px) {
  .features-grid { grid-template-columns: repeat(2, 1fr); }
  .download-inner { flex-direction: column; gap: 48px; text-align: center; }
  .download-features { align-items: center; }
  .dl-btns { justify-content: center; }
  .download-qr { order: -1; }
}

@media (max-width: 768px) {
  :root { --nav-height: 56px; }
  .section-title { font-size: 1.6rem; }

  /* Mobile nav */
  .nav-links {
    position: fixed;
    top: var(--nav-height);
    left: 0; right: 0;
    flex-direction: column;
    background: rgba(255,255,255,.97);
    backdrop-filter: blur(16px);
    padding: 20px 0 28px;
    gap: 0;
    transform: translateY(calc(-100% - var(--nav-height)));
    transition: transform 0.3s ease;
    box-shadow: 0 8px 24px rgba(0,0,0,.1);
    margin-left: 0;
  }
  .nav-links.open { transform: translateY(0); }
  .nav-link { color: var(--text-medium) !important; width: 100%; text-align: center; padding: 13px 20px; border-radius: 0; }
  .nav-link:hover, .nav-link.active { background: #eff6ff !important; color: var(--primary) !important; }
  .btn-nav-cta { display: none; }
  .nav-toggle { display: flex; }
  .nav-toggle.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
  .nav-toggle.active span:nth-child(2) { opacity: 0; }
  .nav-toggle.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

  .hero-stats { padding: 16px 24px; gap: 20px; flex-wrap: wrap; justify-content: center; }
  .features-grid { grid-template-columns: 1fr; }
  .mission-flow { flex-direction: column; align-items: center; }
  .mission-arrow { transform: rotate(90deg); }
  .mission-step { max-width: 100%; width: 100%; }
  .footer-top { gap: 32px; }
  .footer-links-group { gap: 32px; margin-left: 0; }
  .footer-bottom { flex-direction: column; align-items: flex-start; }
}

@media (max-width: 480px) {
  .download-btns, .dl-btns { flex-direction: column; width: 100%; align-items: center; }
  .btn-dl, .btn-dl-lg { width: 100%; max-width: 280px; justify-content: center; }
  .hero-stats { gap: 12px; }
}

/* ============================================================
   Platform Cards (首屏下载)
   ============================================================ */
.hero-download { width: 100%; display: flex; justify-content: center; margin-bottom: 48px; }

.platform-cards {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

.platform-card {
  position: relative;
  width: 130px;
  height: 130px;
  background: rgba(255,255,255,.13);
  border: 1px solid rgba(255,255,255,.28);
  border-radius: var(--radius);
  overflow: hidden;
  cursor: default;
  color: #fff;
  text-decoration: none;
  transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
}
.platform-card-link { cursor: pointer; }
.platform-card-link:hover,
.platform-card-qr-type:hover {
  background: rgba(255,255,255,.22);
  transform: translateY(-3px);
  box-shadow: 0 10px 28px rgba(0,0,0,.22);
}

.platform-card-front,
.platform-card-qr-overlay {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 7px;
  transition: opacity .22s ease;
}
.platform-card-qr-overlay {
  /* 只用 opacity 隐藏，不要 transform。
     二维码是 JS 动态插入的，父级 opacity:0 + transform 时，
     Chrome 首次会把图片请求成功但不解码绘制，刷新后才显示。 */
  opacity: 0;
}
.platform-card-qr-type:hover .platform-card-front {
  opacity: 0;
}
.platform-card-qr-type:hover .platform-card-qr-overlay {
  opacity: 1;
}

.platform-card .platform-icon {
  width: 48px; height: 48px;
  background: rgba(255,255,255,.18);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
}
.platform-card .platform-icon svg { width: 24px; height: 24px; fill: #fff; }

.platform-name {
  font-size: .88rem;
  font-weight: 600;
  color: #fff;
}
.platform-dl-hint {
  font-size: .72rem;
  color: rgba(255,255,255,.6);
}

.platform-qr-box {
  width: 96px;
  height: 96px;
  background: #fff;
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  padding: 4px;
}
.platform-qr-box canvas,
.platform-qr-box img { width: 100% !important; height: 100% !important; object-fit: contain; }

.qr-loading-wrap { display: flex; align-items: center; justify-content: center; width: 100%; height: 100%; }
.spinner-blue { border-color: rgba(37,99,235,.2); border-top-color: #2563eb; }

.platform-qr-label {
  font-size: .7rem;
  color: rgba(255,255,255,.7);
}

/* ============================================================
   Contact Area (第四屏右侧联系客服)
   ============================================================ */
.download-contact-area { flex-shrink: 0; }

.contact-area-box {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  padding: 36px 44px;
  background: rgba(255,255,255,.13);
  border: 1.5px solid rgba(255,255,255,.25);
  border-radius: var(--radius-lg);
  text-align: center;
  min-width: 200px;
}

.contact-area-title { font-size: 1.1rem; font-weight: 700; color: #fff; }

.contact-qr-box {
  width: 128px;
  height: 128px;
  background: #fff;
  border-radius: 8px;
  padding: 6px;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}
.contact-qr-box img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  display: block;
}

.contact-area-desc { font-size: .88rem; color: rgba(255,255,255,.72); line-height: 1.7; }

@media (max-width: 768px) {
  .platform-cards { gap: 10px; }
  .platform-card { width: 108px; height: 108px; }
  .platform-qr-box { width: 80px; height: 80px; }
}