/* ===== CSS Variables - Dark Theme ===== */
:root {
  --bg-base: #0d0d12;
  --bg-surface: #11131a;
  --bg-elevated: #171922;
  --bg-soft: #1f2330;
  --bg-secondary: rgba(255, 255, 255, 0.045);
  --bg-control: rgba(255, 255, 255, 0.06);
  --bg-control-hover: rgba(255, 255, 255, 0.12);
  --border: rgba(255, 255, 255, 0.08);
  --border-strong: rgba(255, 255, 255, 0.15);
  --text-primary: rgba(255, 255, 255, 0.96);
  --text-muted: rgba(255, 255, 255, 0.65);
  --text-soft: rgba(255, 255, 255, 0.5);
  --text-faint: rgba(255, 255, 255, 0.36);
  --accent-cyan: #00fff2;
  --accent-blue: #00b0ff;
  --accent-violet: #5a38ff;
  --accent-text: #e8fcff;
  --gradient-start: #12ffe5;
  --gradient-mid: #369dff;
  --gradient-end: #6f5cff;
  --nav-height: 56px;
  color-scheme: dark;
}

/* ===== Reset ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { -webkit-tap-highlight-color: transparent; scroll-behavior: smooth; }
body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  font-size: 14px; line-height: 1.6; word-wrap: break-word;
  color: var(--text-primary); background: var(--bg-base);
}
a { color: var(--accent-blue); text-decoration: none; }
a:hover { color: var(--accent-cyan); }
ul, ol { list-style-type: none; }
button { outline: none; border: none; cursor: pointer; font: inherit; }
img { border: none; display: block; }

/* ===== Container ===== */
.appdown-page .container { width: 100%; max-width: 1200px; margin: 0 auto; padding: 0 16px; }
@media (min-width: 768px) { .container { padding: 0 24px; } }
@media (min-width: 1024px) { .container { padding: 0 32px; } }

/* ===== Nav ===== */
.appdown-page .nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 50;
  height: var(--nav-height);
  background: color-mix(in srgb, var(--bg-base) 88%, transparent);
  backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}
.appdown-page .nav-inner {
  display: flex; align-items: center; justify-content: space-between;
  height: var(--nav-height);
}
.appdown-page .nav-logo {
  display: flex; align-items: center; gap: 10px;
  text-decoration: none; color: var(--text-primary);
}
.appdown-page .nav-logo img {
  width: 48px;
  height: 32px;
  object-fit: contain;
  border-radius: 0;
}
.appdown-page .nav-logo span {
  font-size: 18px; font-weight: 700;
  background: linear-gradient(92deg, var(--gradient-start), var(--gradient-mid), var(--gradient-end));
  -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent;
}
.appdown-page .nav-actions { display: flex; align-items: center; gap: 12px; }
.appdown-page .nav-hamburger {
  display: flex; align-items: center; justify-content: center;
  width: 36px; height: 36px; border-radius: 8px;
  background: var(--bg-control); color: var(--text-muted);
  transition: background 0.2s;
}
.appdown-page .nav-hamburger:hover { background: var(--bg-control-hover); }
.appdown-page .nav-hamburger svg { width: 20px; height: 20px; }
.appdown-page .nav-download-btn {
  display: none; padding: 8px 20px; border-radius: 999px;
  font-size: 13px; font-weight: 600; color: var(--accent-text);
  background: linear-gradient(135deg,
    color-mix(in srgb, var(--accent-cyan) 26%, transparent),
    color-mix(in srgb, var(--accent-blue) 30%, transparent),
    color-mix(in srgb, var(--accent-violet) 28%, transparent));
  border: 1px solid color-mix(in srgb, var(--accent-blue) 38%, transparent);
  box-shadow: 0 0 20px color-mix(in srgb, var(--accent-blue) 40%, transparent);
  transition: all 0.2s;
}
.appdown-page .nav-download-btn:hover {
  box-shadow: 0 0 24px color-mix(in srgb, var(--accent-blue) 60%, transparent);
  color: var(--accent-text); text-decoration: none;
}
@media (min-width: 768px) {
  .appdown-page .nav-hamburger { display: none; }
  .appdown-page .nav-download-btn { display: inline-flex; }
}

/* ===== Mobile Nav Overlay ===== */
.appdown-page .mobile-nav-overlay {
  position: fixed; inset: 0; z-index: 49;
  background: rgba(0, 0, 0, 0.6);
  opacity: 0; visibility: hidden; transition: all 0.3s;
}
.appdown-page .mobile-nav-overlay.show { opacity: 1; visibility: visible; }
.appdown-page .mobile-nav-panel {
  position: fixed; top: var(--nav-height); left: 0; right: 0;
  background: var(--bg-surface); border-bottom: 1px solid var(--border);
  transform: translateY(-100%); transition: transform 0.3s ease;
  padding: 8px 0;
}
.appdown-page .mobile-nav-overlay.show .appdown-page .mobile-nav-panel { transform: translateY(0); }
.appdown-page .mobile-nav-panel a {
  display: block; padding: 14px 20px; font-size: 15px;
  color: var(--text-muted); text-decoration: none; transition: all 0.2s;
}
.appdown-page .mobile-nav-panel a:hover, .appdown-page .mobile-nav-panel a.active {
  color: var(--text-primary); background: var(--bg-control);
}

/* ===== Hero Section ===== */
.appdown-page .hero {
  padding-top: calc(var(--nav-height) + 48px);
  padding-bottom: 48px; text-align: center;
  position: relative; overflow: hidden;
}
.appdown-page .hero::before {
  content: ''; position: absolute; top: -200px; left: 50%; transform: translateX(-50%);
  width: 800px; height: 600px; pointer-events: none;
  background: radial-gradient(ellipse at center,
    color-mix(in srgb, var(--accent-violet) 12%, transparent) 0%,
    color-mix(in srgb, var(--accent-blue) 8%, transparent) 40%,
    transparent 70%);
}
.appdown-page .hero-title {
  font-size: 32px; font-weight: 900; line-height: 1.2;
  margin-bottom: 16px; position: relative;
}
.appdown-page .hero-title .appdown-page .gradient-text {
  background: linear-gradient(92deg, #9557ff, #6378ff, #48b8ff);
  -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent;
}
.appdown-page .hero-desc {
  font-size: 15px; color: var(--text-soft); line-height: 1.8;
  max-width: 560px; margin: 0 auto 32px; position: relative;
}
.appdown-page .hero-download-area { position: relative; }

/* Utility: responsive visibility */
.appdown-page .mobile-media { display: block; }
.appdown-page .pc-media { display: none; }
@media (min-width: 768px) {
  .appdown-page .mobile-media { display: none; }
  .appdown-page .pc-media { display: block; }
}
@media (min-width: 1024px) {
  .appdown-page .pc-media { display: flex; }
  .appdown-page .pc-media.flex-col { flex-direction: column; }
}

/* ===== Download Button (Mobile) ===== */
.appdown-page .btn-download-hero {
  display: inline-flex; align-items: center; justify-content: center;
  width: 180px; height: 48px; border-radius: 999px;
  font-size: 16px; font-weight: 700; color: var(--accent-text);
  background: linear-gradient(135deg, var(--accent-cyan), var(--accent-blue), var(--accent-violet));
  box-shadow: 0 0 30px color-mix(in srgb, var(--accent-blue) 50%, transparent);
  transition: all 0.3s; text-decoration: none;
}
.appdown-page .btn-download-hero:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 32px color-mix(in srgb, var(--accent-blue) 60%, transparent);
  color: var(--accent-text); text-decoration: none;
}

/* ===== Download Group (Desktop) ===== */
.appdown-page .download-group {
  display: none; align-items: center; justify-content: center; gap: 32px;
  position: relative;
}
.appdown-page .download-qr { text-align: center; }
.appdown-page .download-qr img {
  width: 140px; height: 140px; border-radius: 12px;
  border: 1px solid var(--border);
}
.appdown-page .download-qr .appdown-page .label {
  margin-top: 10px; font-size: 13px; color: var(--text-faint);
}
.appdown-page .download-links { display: flex; flex-direction: column; gap: 12px; }
.appdown-page .download-link {
  display: flex; align-items: center; gap: 10px;
  padding: 12px 28px; border-radius: 12px;
  font-size: 14px; font-weight: 600; color: var(--text-primary);
  background: var(--bg-elevated); border: 1px solid var(--border);
  transition: all 0.2s; text-decoration: none; min-width: 200px;
}
.appdown-page .download-link:hover {
  background: var(--bg-soft); border-color: var(--border-strong);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
  color: var(--text-primary); text-decoration: none;
}
.appdown-page .download-link svg { width: 22px; height: 22px; flex-shrink: 0; }

@media (min-width: 768px) {
  .appdown-page .btn-download-hero { display: none; }
  .appdown-page .download-group { display: flex; }
}

/* ===== Phone Preview ===== */
.appdown-page .hero-phone-preview {
  display: none; position: relative; order: 1;
}
.appdown-page .hero-phone-preview img {
  width: 320px; height: auto;
  filter: drop-shadow(0 20px 40px rgba(0, 0, 0, 0.5));
}

@media (min-width: 1024px) {
  .appdown-page .hero {
    padding-top: calc(var(--nav-height) + 80px);
    padding-bottom: 64px;
  }
  .appdown-page .hero-content {
    display: flex; align-items: center; justify-content: center; gap: 64px;
    text-align: left;
  }
  .appdown-page .hero-text { flex: 0 0 auto; max-width: 520px; }
  .appdown-page .hero-title { font-size: 48px; margin-bottom: 20px; }
  .appdown-page .hero-desc { font-size: 18px; margin: 0 0 36px; }
  .appdown-page .download-group { justify-content: flex-start; }
  .appdown-page .hero-phone-preview { display: block; }
}

/* ===== Features Section ===== */
.appdown-page .features {
  padding: 48px 0; position: relative;
}
.appdown-page .features-title {
  text-align: center; font-size: 24px; font-weight: 800;
  margin-bottom: 32px;
}
.appdown-page .features-title .appdown-page .gradient-text {
  background: linear-gradient(92deg, var(--gradient-start), var(--gradient-mid), var(--gradient-end));
  -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent;
}
.appdown-page .home-feature {
  position: relative; overflow: hidden;
}

/* Feature tabs (mobile) */
.appdown-page .feature-tabs-mobile {
  display: flex; overflow-x: auto; gap: 8px;
  padding: 0 16px 16px; margin: 0 -16px;
  scrollbar-width: none; -ms-overflow-style: none;
}
.appdown-page .feature-tabs-mobile::-webkit-scrollbar { display: none; }
.appdown-page .feature-tab {
  flex-shrink: 0; padding: 8px 18px; border-radius: 999px;
  font-size: 13px; font-weight: 600; white-space: nowrap;
  color: var(--text-soft); background: var(--bg-control);
  border: 1px solid transparent; transition: all 0.2s;
}
.appdown-page .feature-tab.active {
  color: #fff;
  background: linear-gradient(135deg,
    color-mix(in srgb, var(--accent-cyan) 20%, transparent),
    color-mix(in srgb, var(--accent-violet) 20%, transparent));
  border-color: color-mix(in srgb, var(--accent-blue) 40%, transparent);
}
.appdown-page .feature-tab-desc {
  padding: 0 16px 20px; font-size: 13px; color: var(--text-muted);
  line-height: 1.7; min-height: 72px;
}

/* Feature tabs (desktop) */
.appdown-page .feature-tabs-desktop {
  display: none; flex-direction: column; gap: 12px;
}
.appdown-page .feature-tab-item {
  padding: 16px 20px; border-radius: 12px; cursor: pointer;
  transition: all 0.2s; border: 1px solid transparent;
}
.appdown-page .feature-tab-item:hover { background: var(--bg-control); }
.appdown-page .feature-tab-item.active {
  background: linear-gradient(135deg,
    color-mix(in srgb, var(--accent-cyan) 12%, transparent),
    color-mix(in srgb, var(--accent-violet) 12%, transparent));
  border-color: color-mix(in srgb, var(--accent-blue) 30%, transparent);
}
.appdown-page .feature-tab-item .appdown-page .ft-title {
  font-size: 15px; font-weight: 700; margin-bottom: 6px;
  color: var(--text-muted); transition: color 0.2s;
}
.appdown-page .feature-tab-item.active .appdown-page .ft-title { color: var(--text-primary); }
.appdown-page .feature-tab-item .appdown-page .ft-desc {
  font-size: 13px; color: var(--text-soft); line-height: 1.6;
}
.appdown-page .feature-tab-item.active .appdown-page .ft-desc { color: var(--text-muted); }

/* Feature carousel */
.appdown-page .feature-carousel {
  position: relative; overflow: hidden;
  height: 260px;
}
.appdown-page .feature-slide {
  position: absolute; top: 50%; left: 50%;
  transform: translate(-50%, -50%) translateX(var(--slide-x, 0px)) scale(var(--slide-scale, 1));
  width: 130px; height: 240px;
  border-radius: 14px; overflow: hidden;
  box-shadow: 0 8px 28px rgba(0, 0, 0, 0.4);
  background: var(--bg-elevated);
  cursor: pointer;
  transition: transform 400ms linear, opacity 400ms ease, filter 400ms ease, box-shadow 400ms ease;
}
.appdown-page .feature-slide.active {
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.5),
    0 0 0 1px color-mix(in srgb, var(--accent-blue) 30%, transparent);
}
.appdown-page .feature-slide img {
  width: 100%; height: 100%; object-fit: cover;
  opacity: 0.5; transition: opacity 0.3s;
}
.appdown-page .feature-slide.active img { opacity: 1; }

/* Mobile layout: right-side menu, hero spacing, and stacked phone previews */
@media (max-width: 767px) {
  .appdown-page .nav-inner { justify-content: space-between; }
  .appdown-page .nav-logo { display: flex; }
  .appdown-page .nav-actions { gap: 0; }
  .appdown-page .nav-hamburger {
    width: 44px;
    height: 44px;
    border-radius: 0;
    background: transparent;
  }
  .appdown-page .nav-hamburger:hover { background: transparent; }

  .appdown-page .hero {
    padding-top: calc(var(--nav-height) + 54px);
    padding-bottom: 44px;
    text-align: left;
  }
  .appdown-page .hero-eyebrow {
    margin-bottom: 8px;
    font-size: 12px;
    font-weight: 600;
  }
  .appdown-page .hero-title {
    font-size: 27px;
    line-height: 1.3;
    margin-bottom: 14px;
  }
  .appdown-page .hero-desc {
    max-width: none;
    margin: 0 0 26px;
    font-size: 14px;
    line-height: 1.8;
  }
  .appdown-page .btn-download-hero {
    width: 180px;
    height: 45px;
    border-radius: 999px;
    font-size: 16px;
  }

  .appdown-page .features { padding: 18px 0 44px; }
  .appdown-page .features-title {
    margin-bottom: 12px;
    font-size: 21px;
    line-height: 1.35;
    text-align: left;
  }
  .appdown-page .home-feature { padding: 0; }
  .appdown-page .features-layout {
    display: grid;
    grid-template-columns: minmax(104px, 34%) minmax(0, 1fr);
    grid-template-rows: auto 1fr;
    column-gap: 12px;
    align-items: start;
    max-width: 620px;
    margin: 0 auto;
    padding: 0;
  }
  .appdown-page .feature-tabs-mobile {
    grid-column: 1;
    grid-row: 1;
    flex-direction: column;
    overflow: visible;
    gap: 2px;
    padding: 0;
    margin: 0;
    align-items: stretch;
  }
  .appdown-page .feature-tab {
    position: relative;
    padding: 8px 4px 8px 14px;
    border-radius: 0;
    background: transparent;
    color: var(--text-soft);
    font-size: 15px;
    line-height: 1.35;
    font-weight: 500;
    text-align: left;
  }
  .appdown-page .feature-tab.active {
    background: transparent;
    border-color: transparent;
    color: var(--text-primary);
    font-weight: 700;
  }
  .appdown-page .feature-tab.active::before {
    position: absolute;
    top: 50%;
    left: 0;
    width: 3px;
    height: 16px;
    background: var(--accent-blue);
    content: '';
    transform: translateY(-50%);
  }
  .appdown-page .feature-tab-desc {
    grid-column: 1;
    grid-row: 2;
    padding: 12px 4px 0 14px;
    color: var(--text-soft);
    font-size: 13px;
    line-height: 1.75;
    min-height: auto;
  }
  .appdown-page .feature-carousel {
    grid-column: 2;
    grid-row: 1 / span 2;
    width: 100%;
    height: 316px;
    margin: 0;
    overflow: visible;
  }
  .appdown-page .feature-slide {
    width: 158px;
    height: 292px;
    border-radius: 13px;
    box-shadow: 0 12px 26px rgba(20, 22, 27, 0.16);
  }
  .appdown-page .feature-slide.active {
    box-shadow: 0 16px 32px rgba(20, 22, 27, 0.2), 0 0 0 1px rgba(23, 24, 27, 0.08);
  }

  .appdown-page .footer {
    padding: 30px 16px;
  }
  .appdown-page .footer p {
    font-size: 13px;
    line-height: 1.75;
  }
}

@media (min-width: 768px) {
  .appdown-page .feature-tabs-mobile { display: none; }
  .appdown-page .feature-tab-desc { display: none; }
  .appdown-page .feature-tabs-desktop {
    display: flex; flex-direction: column; gap: 12px;
    flex: 0 0 280px;
  }
  .appdown-page .features-layout {
    display: flex; align-items: center; justify-content: center;
    gap: 48px; max-width: 1000px; margin: 0 auto;
  }
  .appdown-page .feature-carousel { flex: 0 0 360px; height: 420px; }
  .appdown-page .feature-slide { width: 200px; height: 380px; border-radius: 20px; }
  .appdown-page .features-title { font-size: 32px; margin-bottom: 48px; }
}
@media (min-width: 1024px) {
  .appdown-page .feature-tabs-desktop { flex: 0 0 340px; }
  .appdown-page .feature-carousel { flex: 0 0 420px; height: 480px; }
  .appdown-page .feature-slide { width: 220px; height: 420px; }
}

/* ===== Desktop Showcase ===== */
.appdown-page .desktop-showcase { display: none; }

@media (min-width: 1024px) {
  .appdown-page .hero { display: none; }
  .appdown-page .mobile-features { display: none; }
  .appdown-page .desktop-showcase {
    display: block;
    max-width: 1180px;
    margin: calc(var(--nav-height) + 24px) auto 40px;
    padding: 0 24px;
  }
  .appdown-page .desktop-showcase__top {
    min-height: 440px;
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(400px, 0.95fr);
    overflow: hidden;
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: 16px;
  }
  .appdown-page .showcase-visual {
    min-height: 440px;
    display: flex;
    align-items: flex-end;
    justify-content: center;
    overflow: hidden;
    background: #121321;
  }
  .appdown-page .showcase-visual img {
    width: min(72%, 340px);
    max-height: 490px;
    object-fit: contain;
    object-position: bottom;
    filter: drop-shadow(0 16px 28px rgba(0, 0, 0, 0.55));
    animation: appdownShowcase-main-float 5s ease-in-out infinite;
  }
  .appdown-page .showcase-intro {
    align-self: center;
    max-width: 500px;
    padding: 38px 46px 38px 44px;
  }
  .appdown-page .showcase-kicker {
    margin-bottom: 8px;
    font-size: 13px;
    font-weight: 700;
    color: var(--accent-cyan);
  }
  .appdown-page .showcase-intro h2 {
    margin: 0 0 16px;
    font-size: 34px;
    line-height: 1.25;
    letter-spacing: 0;
    color: var(--text-primary);
  }
  .appdown-page .showcase-intro > p:not(.appdown-page .showcase-kicker) {
    margin: 0;
    color: var(--text-muted);
    font-size: 14px;
    line-height: 1.8;
  }
  .appdown-page .showcase-downloads {
    display: flex;
    align-items: center;
    gap: 20px;
    margin-top: 22px;
  }
  .appdown-page .showcase-qr { flex: 0 0 112px; text-align: center; }
  .appdown-page .showcase-qr img {
    width: 112px;
    height: 112px;
    padding: 5px;
    border-radius: 8px;
    background: #fff;
  }
  .appdown-page .showcase-qr span {
    display: block;
    margin-top: 8px;
    color: var(--text-faint);
    font-size: 12px;
  }
  .appdown-page .showcase-actions {
    display: grid;
    gap: 10px;
    min-width: 200px;
  }
  .appdown-page .showcase-actions a {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 42px;
    padding: 0 18px;
    border: 1px solid var(--border-strong);
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 15px;
    font-weight: 700;
    background: var(--bg-elevated);
    transition: transform .2s ease, background .2s ease;
  }
  .appdown-page .showcase-actions a:hover {
    color: var(--text-primary);
    text-decoration: none;
    background: var(--bg-soft);
    transform: translateY(-2px);
  }
  .appdown-page .desktop-showcase__bottom {
    position: relative;
    display: grid;
    grid-template-columns: minmax(210px, .8fr) minmax(390px, 1.3fr) minmax(210px, .8fr);
    gap: 24px;
    min-height: 530px;
    margin-top: 20px;
    padding: 36px 40px 0;
    overflow: hidden;
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: 16px;
  }
  .appdown-page .showcase-copy {
    position: relative;
    z-index: 2;
    display: flex;
    flex-direction: column;
    gap: 24px;
  }
  .appdown-page .showcase-copy--left { padding-top: 18px; text-align: right; }
  .appdown-page .showcase-copy--right { padding-top: 18px; text-align: left; }
  .appdown-page .showcase-copy article { padding: 2px 0; }
  .appdown-page .showcase-copy article.is-active {
    padding: 15px;
    border: 1px solid color-mix(in srgb, var(--accent-blue) 34%, transparent);
    border-radius: 10px;
    background: linear-gradient(135deg, color-mix(in srgb, var(--accent-blue) 16%, transparent), color-mix(in srgb, var(--accent-violet) 12%, transparent));
  }
  .appdown-page .showcase-copy h3 {
    margin: 0 0 7px;
    font-size: 19px;
    line-height: 1.25;
    color: var(--text-primary);
  }
  .appdown-page .showcase-copy p {
    margin: 0;
    color: var(--text-soft);
    font-size: 13px;
    line-height: 1.65;
  }
  .appdown-page .showcase-phones {
    position: relative;
    height: 475px;
    align-self: end;
  }
  .appdown-page .showcase-phone {
    position: absolute;
    bottom: -6px;
    width: 225px;
    max-height: 455px;
    object-fit: contain;
    filter: drop-shadow(0 16px 25px rgba(0, 0, 0, .48));
    will-change: transform;
  }
  .appdown-page .showcase-phone--left {
    left: 5%;
    z-index: 1;
    opacity: .6;
    animation: appdownShowcase-phone-left 5.6s ease-in-out infinite;
  }
  .appdown-page .showcase-phone--center {
    left: 50%;
    z-index: 3;
    animation: appdownShowcase-phone-center 4.6s ease-in-out infinite;
  }
  .appdown-page .showcase-phone--right {
    right: 5%;
    z-index: 2;
    opacity: .62;
    animation: appdownShowcase-phone-right 5.2s ease-in-out infinite;
  }
  @keyframes appdownShowcase-main-float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
  }
  @keyframes appdownShowcase-phone-left {
    0%, 100% { transform: scale(.appdown-page .76) translate(-31%, 0); }
    50% { transform: scale(.appdown-page .76) translate(-35%, -14px); }
  }
  @keyframes appdownShowcase-phone-center {
    0%, 100% { transform: translate(-50%, 0); }
    50% { transform: translate(-50%, -18px); }
  }
  @keyframes appdownShowcase-phone-right {
    0%, 100% { transform: scale(.appdown-page .78) translate(30%, 0); }
    50% { transform: scale(.appdown-page .78) translate(34%, -12px); }
  }
  @media (prefers-reduced-motion: reduce) {
    .showcase-visual img,
    .appdown-page .showcase-phone { animation: none; }
  }
}

@media (min-width: 1280px) {
  .appdown-page .desktop-showcase { max-width: 1280px; }
  .appdown-page .desktop-showcase__top { min-height: 570px; }
  .appdown-page .showcase-visual { min-height: 570px; }
  .appdown-page .showcase-visual img { width: min(78%, 435px); max-height: 630px; }
  .appdown-page .showcase-intro { padding-left: 68px; }
  .appdown-page .showcase-intro h2 { font-size: 44px; }
}

/* ===== Download Dialog ===== */
.dialog-overlay {
  position: fixed; inset: 0; z-index: 100;
  background: rgba(0, 0, 0, 0.65); backdrop-filter: blur(4px);
}
.dialog-box {
  position: fixed; left: 50%; top: 50%; z-index: 101;
  transform: translate(-50%, -50%);
  width: calc(100% - 32px); max-width: 380px;
  background: var(--bg-surface); border: 1px solid var(--border);
  border-radius: 20px; overflow: hidden;
  box-shadow: 0 24px 64px rgba(0, 0, 0, 0.5);
}
.dialog-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 16px 20px; border-bottom: 1px solid var(--border);
}
.dialog-header h3 {
  font-size: 16px; font-weight: 700; color: var(--text-primary);
}
.dialog-close {
  width: 32px; height: 32px; border-radius: 8px;
  display: flex; align-items: center; justify-content: center;
  color: var(--text-faint); background: transparent; transition: all 0.2s;
}
.dialog-close:hover { color: var(--text-primary); background: var(--bg-control); }
.dialog-close svg { width: 18px; height: 18px; }
.dialog-body { padding: 24px; text-align: center; }
.dialog-qr { width: 160px; height: 160px; border-radius: 12px; margin: 0 auto; border: 1px solid var(--border); }
.dialog-qr-label { margin-top: 12px; font-size: 13px; color: var(--text-faint); }
.dialog-links {
  display: flex; gap: 12px; margin-top: 20px; justify-content: center;
}
.dialog-link {
  display: flex; align-items: center; gap: 8px;
  padding: 10px 20px; border-radius: 10px;
  font-size: 13px; font-weight: 600; color: var(--text-primary);
  background: var(--bg-elevated); border: 1px solid var(--border);
  transition: all 0.2s; text-decoration: none;
}
.dialog-link:hover {
  background: var(--bg-soft); border-color: var(--border-strong);
  color: var(--text-primary); text-decoration: none;
}
.dialog-link svg { width: 18px; height: 18px; }

@media (min-width: 768px) {
  .dialog-box { max-width: 420px; }
}

/* ===== WeChat Reminder ===== */
.wx-overlay {
  position: fixed; inset: 0; z-index: 200;
  background: rgba(0, 0, 0, 0.7);
}
.wx-content {
  position: absolute; top: 60px; right: 24px; text-align: right;
}
.wx-arrow {
  width: 40px; height: 54px; margin-left: auto; margin-bottom: 12px;
}
.wx-tip {
  font-size: 16px; font-weight: 700; color: #fff;
}

/* ===== Footer ===== */
.appdown-page .footer {
  padding: 32px 16px; text-align: center;
  border-top: 1px solid var(--border);
}
.appdown-page .footer p { font-size: 12px; color: var(--text-faint); line-height: 1.8; }
.appdown-page .footer a { color: var(--text-faint); text-decoration: none; }
.appdown-page .footer a:hover { color: var(--text-muted); }

/* ===== Privacy Page ===== */
.appdown-page .privacy-page {
  max-width: 800px; margin: calc(var(--nav-height) + 32px) auto 32px;
  padding: 32px 24px; background: var(--bg-surface);
  border: 1px solid var(--border); border-radius: 16px;
}
.appdown-page .privacy-page h1 {
  font-size: 24px; font-weight: 800; text-align: center;
  margin-bottom: 32px;
  background: linear-gradient(92deg, var(--gradient-start), var(--gradient-mid), var(--gradient-end));
  -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent;
}
.appdown-page .privacy-page h2 {
  font-size: 16px; font-weight: 700; color: var(--text-primary);
  margin: 28px 0 12px; padding-left: 12px;
  border-left: 3px solid var(--accent-blue);
}
.appdown-page .privacy-page p {
  font-size: 14px; color: var(--text-muted); line-height: 1.9;
  margin: 8px 0; text-indent: 2em;
}
.appdown-page .privacy-page a { color: var(--accent-blue); }
@media (min-width: 768px) {
  .appdown-page .privacy-page { padding: 48px 40px; margin-top: calc(var(--nav-height) + 48px); }
  .appdown-page .privacy-page h1 { font-size: 28px; }
}

/* ===== Animations ===== */
@keyframes appdownFadeIn { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: translateY(0); } }
@keyframes appdownPopIn {
  0% { opacity: 0; transform: translate(-50%, -60%) scale(0.95); }
  100% { opacity: 1; transform: translate(-50%, -50%) scale(1); }
}
.appdown-page .animate-fade-in { animation: appdownFadeIn 0.3s ease-out; }
.appdown-page .animate-pop-in { animation: appdownPopIn 0.35s ease-out; }

/* ===== Desktop Fix ===== */
/* Desktop layout aligned with appdown.shopaix.cc */
@media (min-width: 1024px) {
  .appdown-page .desktop-showcase { display: none !important; }
  .appdown-page .hero { display: block; padding: calc(var(--nav-height) + 28px) 0 30px; }
  .appdown-page .mobile-features { display: block; padding: 26px 0 44px; }

  .appdown-page .hero-content {
    display: grid;
    grid-template-columns: 420px minmax(440px, 1fr);
    align-items: center;
    justify-content: center;
    gap: 56px;
    max-width: 1060px;
    margin: 0 auto;
    text-align: left;
  }
  .appdown-page .hero-text { max-width: none; min-width: 0; }
  .appdown-page .hero-phone-preview {
    display: block;
    width: 420px;
    height: 236px;
    overflow: hidden;
    order: initial;
  }
  .appdown-page .hero-phone-preview img {
    width: 420px;
    height: 236px;
    max-width: none;
    max-height: none;
    object-fit: cover;
    object-position: center;
    transform: none;
  }
  .appdown-page .hero-title { font-size: 38px; margin-bottom: 14px; }
  .appdown-page .hero-desc { max-width: 590px; margin: 0 0 24px; font-size: 15px; line-height: 1.75; }
  .appdown-page .download-group { justify-content: flex-start; gap: 18px; }
  .appdown-page .download-qr img { width: 116px; height: 116px; }
  .appdown-page .download-links { gap: 10px; }
  .appdown-page .download-link { min-width: 190px; padding: 10px 18px; }

  .appdown-page .features-title { margin-bottom: 26px; }
  .appdown-page .features-layout {
    display: grid;
    grid-template-columns: 210px 460px 210px;
    align-items: center;
    justify-content: center;
    gap: 24px;
    max-width: 930px;
    margin: 0 auto;
  }
  .appdown-page .feature-tabs-desktop {
    display: flex;
    width: 220px;
    min-width: 0;
    flex: none;
    gap: 10px;
  }
  .appdown-page .feature-tab-item { padding: 12px 14px; }
  .appdown-page .feature-tab-item .appdown-page .ft-title { margin-bottom: 4px; font-size: 14px; }
  .appdown-page .feature-tab-item .appdown-page .ft-desc { font-size: 12px; line-height: 1.5; }

  .appdown-page .feature-carousel {
    width: 460px;
    min-width: 0;
    height: 400px;
    margin: 0;
    overflow: hidden;
    isolation: isolate;
  }
  .appdown-page .feature-slide {
    top: 50%;
    left: 50%;
    width: 200px;
    height: 380px;
    margin: 0;
    border-radius: 14px;
    transform: translate(-50%, -50%) translateX(var(--slide-x, 0px)) scale(var(--slide-scale, 1));
    transform-origin: center;
    transition: transform .4s linear, opacity .4s ease, filter .4s ease, box-shadow .4s ease;
  }
  .appdown-page .feature-slide.active {
    opacity: 1;
    filter: brightness(1);
    box-shadow: 0 18px 42px rgba(0, 0, 0, .52), 0 0 0 1px color-mix(in srgb, var(--accent-blue) 45%, transparent);
  }
  .appdown-page .feature-slide.second-floor {
    opacity: .64;
    filter: brightness(.8);
    box-shadow: 0 12px 28px rgba(0, 0, 0, .38);
  }
  .appdown-page .feature-slide.third-floor {
    opacity: .24;
    filter: brightness(.58);
    box-shadow: none;
  }
}

@media (min-width: 1280px) {
  .appdown-page .hero-content { grid-template-columns: 470px 590px; gap: 64px; max-width: 1124px; }
  .appdown-page .hero-phone-preview { width: 470px; height: 264px; }
  .appdown-page .hero-phone-preview img { width: 470px; height: 264px; }
  .appdown-page .features-layout {
    grid-template-columns: 260px 560px 260px;
    gap: 28px;
    max-width: 1120px;
  }
  .appdown-page .feature-tabs-desktop { width: 240px; }
  .appdown-page .feature-carousel { width: 500px; height: 420px; }
  .appdown-page .feature-slide { width: 210px; height: 400px; }
}