:root {
  --primary: #2557d6;
  --primary-dark: #1944ab;
  --primary-soft: #eaf1ff;
  --navy: #10192f;
  --navy-deep: #0f1730;
  --bg-white: #ffffff;
  --bg-soft: #f6f8fc;
  --border: #e4e9f2;
  --text-primary: #182033;
  --text-secondary: #5a6476;
  --text-muted: #8791a6;
  --shadow-sm: 0 1px 2px rgba(12, 22, 44, 0.08);
  --shadow: 0 14px 32px rgba(12, 22, 44, 0.12);
  --shadow-lg: 0 24px 50px rgba(12, 22, 44, 0.18);
  --radius: 16px;
  --radius-lg: 22px;
  --container: 1200px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 96px;
}

body {
  margin: 0;
  font-family: "Noto Sans SC", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--text-primary);
  background: var(--bg-white);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

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

a {
  color: inherit;
  text-decoration: none;
  overflow-wrap: anywhere;
}

button {
  font: inherit;
}

.header,
.section-inner,
.hero-inner,
.footer-inner {
  width: min(calc(100% - 48px), var(--container));
  margin: 0 auto;
}

.header {
  position: sticky;
  top: 0;
  z-index: 30;
  height: 84px;
  display: flex;
  align-items: center;
  background: rgba(255, 255, 255, 0.97);
  border-bottom: 1px solid rgba(228, 233, 242, 0.9);
  backdrop-filter: blur(12px);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: var(--primary);
  font-size: 1.5rem;
  font-weight: 900;
}

.brand img {
  width: 40px;
  height: 40px;
  border-radius: 12px;
  object-fit: cover;
}

.nav {
  display: flex;
  align-items: center;
  gap: 36px;
  color: var(--text-secondary);
  font-weight: 700;
}

.nav-cta,
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 56px;
  padding: 0 26px;
  border-radius: 999px;
  font-weight: 800;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}

.nav-cta {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: #fff;
  box-shadow: 0 12px 24px rgba(37, 87, 214, 0.26);
}

.btn-primary {
  background: linear-gradient(135deg, #2b59df, #2a53c6);
  color: #fff;
  box-shadow: 0 14px 24px rgba(31, 79, 200, 0.24);
}

.btn-secondary {
  border: 3px solid rgba(255, 255, 255, 0.24);
  color: #fff;
  background: rgba(255, 255, 255, 0.06);
}

.hero {
  background:
    linear-gradient(180deg, rgba(16, 25, 47, 0.96), rgba(16, 25, 47, 0.96)),
    radial-gradient(circle at 10% 10%, rgba(56, 102, 214, 0.24), transparent 28%),
    var(--navy);
  color: #fff;
  padding: 56px 0 70px;
}

.hero-inner {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(360px, 0.9fr);
  gap: 54px;
  align-items: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  min-height: 34px;
  padding: 0 14px;
  margin-bottom: 18px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.1);
  color: #d7e4ff;
  font-weight: 700;
}

.hero-copy h1 {
  margin: 0 0 18px;
  max-width: 760px;
  font-size: 4.25rem;
  line-height: 1.05;
  letter-spacing: 0;
}

.hero-copy h1 span {
  display: block;
  font-size: 1.02em;
  background: linear-gradient(135deg, #64a8ff, #52d6cf);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-copy p {
  margin: 0 0 34px;
  max-width: 900px;
  color: rgba(255, 255, 255, 0.76);
  font-size: 1.08rem;
  line-height: 1.9;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  margin-bottom: 34px;
}

.hero-points {
  display: flex;
  flex-wrap: wrap;
  gap: 28px;
  color: rgba(255, 255, 255, 0.8);
  font-size: 1rem;
}

.hero-points span {
  position: relative;
  padding-left: 22px;
}

.hero-points span::before {
  content: "✓";
  position: absolute;
  left: 0;
  top: 0;
  color: rgba(255, 255, 255, 0.72);
}

.hero-showcase {
  display: grid;
  grid-template-columns: minmax(210px, 0.82fr) minmax(220px, 1fr);
  gap: 18px;
  align-items: center;
}

.hero-phone {
  position: relative;
  overflow: hidden;
  width: min(100%, 300px);
  justify-self: end;
  border: 8px solid rgba(255, 255, 255, 0.16);
  border-radius: 34px;
  background: #0b1224;
  box-shadow: 0 24px 52px rgba(0, 0, 0, 0.28);
}

.hero-phone img {
  width: 100%;
  aspect-ratio: 332 / 720;
  object-fit: cover;
}

.hero-phone-caption {
  position: absolute;
  left: 12px;
  right: 12px;
  bottom: 12px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 12px 14px;
  border-radius: 18px;
  background: rgba(15, 23, 48, 0.84);
  backdrop-filter: blur(10px);
}

.hero-phone-caption strong {
  font-size: 1rem;
}

.hero-phone-caption span {
  color: rgba(255, 255, 255, 0.72);
  font-size: 0.86rem;
}

.hero-contact {
  position: relative;
  display: grid;
  gap: 18px;
  padding: 10px;
  border: 1px solid rgba(176, 140, 85, 0.62);
  border-radius: 28px;
}

.hero-contact-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 18px 18px 18px 22px;
  border-radius: 32px;
  background: rgba(255, 255, 255, 0.12);
  border: 1px solid rgba(255, 255, 255, 0.14);
  backdrop-filter: blur(10px);
}

.hero-download-card {
  display: grid;
  gap: 10px;
  padding: 20px 22px;
  border-radius: 24px;
  background: #fff;
  color: var(--text-primary);
  box-shadow: 0 18px 34px rgba(0, 0, 0, 0.18);
}

.hero-download-card strong {
  font-size: 1.12rem;
  line-height: 1.35;
}

.hero-download-card span {
  color: var(--text-secondary);
  line-height: 1.6;
}

.hero-download-card a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 18px;
  border-radius: 999px;
  background: var(--primary);
  color: #fff;
  font-weight: 900;
}

.hero-contact-label {
  display: block;
  color: rgba(255, 255, 255, 0.74);
  font-size: 0.9rem;
  margin-bottom: 6px;
}

.hero-contact-card strong {
  font-size: 1.3rem;
  letter-spacing: 0.5px;
}

.copy-btn,
.copy-link {
  border: 0;
  cursor: pointer;
  border-radius: 999px;
  font-weight: 800;
  transition: transform 0.2s ease;
}

.copy-btn {
  min-width: 82px;
  min-height: 48px;
  padding: 0 18px;
  background: rgba(255, 255, 255, 0.34);
  color: #fff;
}

.copy-link {
  min-height: 38px;
  padding: 0 14px;
  background: rgba(255, 255, 255, 0.12);
  color: #fff;
}

.section-badge {
  display: inline-flex;
  align-items: center;
  min-height: 34px;
  padding: 0 14px;
  border-radius: 999px;
  font-size: 0.9rem;
  font-weight: 800;
  color: var(--primary);
  background: var(--primary-soft);
}

.section-badge.inverted {
  color: #d7e4ff;
  background: rgba(255, 255, 255, 0.12);
}

.section-header {
  max-width: 860px;
  margin: 0 auto 42px;
  text-align: center;
}

.section-header h2 {
  margin: 14px 0 12px;
  font-size: 2.75rem;
  line-height: 1.12;
  color: var(--text-primary);
}

.section-header p {
  margin: 0;
  color: var(--text-secondary);
  font-size: 1rem;
  line-height: 1.8;
}

.features,
.wechat-section,
.screenshots,
.testimonials,
.faq,
.download {
  padding: 84px 0;
}

.features {
  background: #fff;
}

.features-grid,
.screenshots-grid,
.testimonials-grid,
.faq-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 34px 30px;
}

.feature-card,
.testimonial-card,
.faq-item {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 28px;
  box-shadow: 0 1px 0 rgba(17, 24, 39, 0.02);
}

.feature-card {
  padding: 36px;
  min-height: 290px;
}

.feature-icon {
  width: 84px;
  height: 84px;
  border-radius: 18px;
  display: grid;
  place-items: center;
  font-size: 2rem;
  margin-bottom: 26px;
}

.feature-icon.blue { background: #dceaff; }
.feature-icon.yellow { background: #fef0c2; }
.feature-icon.green { background: #d3f6df; }
.feature-icon.purple { background: #eadcff; }
.feature-icon.pink { background: #ffe0e4; }
.feature-icon.cyan { background: #cff6ff; }

.feature-card h3 {
  margin: 0 0 14px;
  font-size: 1.55rem;
  line-height: 1.2;
}

.feature-card p {
  margin: 0;
  color: var(--text-secondary);
  font-size: 1.04rem;
  line-height: 1.85;
}

.wechat-section {
  background: var(--navy);
  color: #fff;
}

.wechat-banner {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(280px, 1fr);
  gap: 34px;
  align-items: center;
}

.wechat-banner h2 {
  margin: 14px 0 12px;
  font-size: 2.75rem;
  line-height: 1.12;
}

.wechat-banner p {
  margin: 0;
  color: rgba(255, 255, 255, 0.72);
  font-size: 1.02rem;
  line-height: 1.8;
}

.wechat-block {
  display: grid;
  gap: 16px;
}

.wechat-row {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 18px 18px 18px 22px;
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.18);
  background: rgba(255, 255, 255, 0.1);
}

.wechat-row span {
  color: rgba(255, 255, 255, 0.72);
}

.wechat-row strong {
  margin-right: auto;
  font-size: 1.35rem;
}

.screenshots {
  background: #fff;
}

.screenshot-item {
  position: relative;
  overflow: hidden;
  border-radius: 26px;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border);
}

.screenshot-item img {
  width: 100%;
  aspect-ratio: 9 / 19;
  object-fit: cover;
}

.screenshot-overlay {
  position: absolute;
  inset: auto 0 0;
  padding: 52px 22px 22px;
  color: #fff;
  background: linear-gradient(180deg, rgba(15, 23, 42, 0), rgba(15, 23, 42, 0.82));
}

.screenshot-overlay h3 {
  margin: 0 0 6px;
  font-size: 1.1rem;
}

.screenshot-overlay p {
  margin: 0;
  color: rgba(255, 255, 255, 0.82);
  line-height: 1.7;
}

.testimonials {
  background: #fff;
}

.testimonial-card {
  padding: 30px 28px;
}

.stars {
  color: #ffbb2d;
  font-size: 1.15rem;
  margin-bottom: 22px;
}

.testimonial-card p {
  margin: 0 0 26px;
  color: var(--text-secondary);
  line-height: 1.85;
  font-size: 1.03rem;
}

.person {
  display: flex;
  align-items: center;
  gap: 14px;
}

.avatar {
  width: 52px;
  height: 52px;
  border-radius: 50%;
  background: #2e62e5;
  color: #fff;
  display: grid;
  place-items: center;
  font-weight: 900;
  font-size: 1.1rem;
}

.person strong {
  display: block;
  margin-bottom: 4px;
  font-size: 1rem;
}

.person span {
  color: var(--text-muted);
  font-size: 0.95rem;
}

.faq {
  background: var(--bg-soft);
}

.faq-item {
  padding: 28px;
}

.faq-item h3 {
  margin: 0 0 10px;
  font-size: 1.12rem;
}

.faq-item p {
  margin: 0;
  color: var(--text-secondary);
  line-height: 1.8;
}

.download {
  background: #fff;
}

.download-panel {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 30px 36px;
  border: 1px solid var(--border);
  border-radius: 28px;
  box-shadow: var(--shadow-sm);
}

.conversion-panel {
  margin-top: 30px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 22px;
  align-items: center;
  padding: 24px 28px;
  border-radius: 24px;
  background: var(--navy);
  color: #fff;
}

.conversion-panel h3 {
  margin: 0 0 8px;
  font-size: 1.35rem;
}

.conversion-panel p {
  margin: 0;
  color: rgba(255, 255, 255, 0.72);
  line-height: 1.7;
}

.conversion-panel a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 50px;
  padding: 0 22px;
  border-radius: 999px;
  background: #fff;
  color: var(--primary);
  font-weight: 900;
}

.download-gate {
  min-height: calc(100vh - 84px);
  display: flex;
  align-items: center;
  padding: 42px 0 68px;
  background:
    linear-gradient(180deg, rgba(16, 25, 47, 0.96), rgba(16, 25, 47, 0.96)),
    var(--navy);
  color: #fff;
}

.download-gate-inner {
  width: min(calc(100% - 48px), 900px);
  margin: 0 auto;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 240px;
  gap: 24px;
  align-items: center;
}

.download-gate-copy h1 {
  margin: 0 0 14px;
  font-size: 2.75rem;
  line-height: 1.1;
}

.download-gate-copy p {
  margin: 0 0 18px;
  color: rgba(255, 255, 255, 0.76);
  font-size: 1.06rem;
  line-height: 1.85;
}

.download-gate-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-bottom: 22px;
}

.invite-code-box {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 14px;
  align-items: center;
  margin: 0 0 22px;
  padding: 16px 18px;
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.1);
}

.invite-code-box span {
  color: rgba(255, 255, 255, 0.72);
  font-weight: 800;
}

.invite-code-box strong {
  font-size: 2.25rem;
  letter-spacing: 0;
  color: #fff;
}

.invite-code-box button {
  min-height: 42px;
  padding: 0 16px;
  border: 0;
  border-radius: 999px;
  background: #fff;
  color: var(--primary);
  font: inherit;
  font-weight: 900;
  cursor: pointer;
}

.gate-copy-btn {
  border: 2px solid rgba(255, 255, 255, 0.24);
  cursor: pointer;
}

.gate-tips {
  display: grid;
  gap: 10px;
  color: rgba(255, 255, 255, 0.72);
  font-weight: 700;
}

.download-gate-card {
  display: grid;
  justify-items: center;
  gap: 10px;
  padding: 20px;
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: 24px;
  background: rgba(255, 255, 255, 0.08);
  box-shadow: 0 24px 52px rgba(0, 0, 0, 0.22);
  text-align: center;
}

.download-gate-card img {
  width: 10px;
  height: 10px;
  border-radius: 3px;
}

.download-gate-card strong {
  font-size: 1.18rem;
}

.download-gate-card span {
  color: rgba(255, 255, 255, 0.7);
  line-height: 1.6;
}

.invite-mini {
  width: 100%;
  padding: 9px 10px;
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.1);
  color: rgba(255, 255, 255, 0.78);
  font-weight: 800;
}

.invite-mini b {
  color: #fff;
  font-size: 1.08rem;
}

.download-gate-card a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  min-height: 48px;
  margin-top: 8px;
  border-radius: 999px;
  background: #fff;
  color: var(--primary);
  font-weight: 900;
}

.download-panel h2 {
  margin: 12px 0 0;
  font-size: 1.45rem;
}

.wechat-list {
  margin-top: 20px;
}

.wechat-label {
  display: block;
  margin-bottom: 12px;
  color: var(--text-muted);
  font-size: 0.95rem;
  font-weight: 700;
}

.wechat-codes {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.wechat-codes span {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  padding: 0 14px;
  border-radius: 999px;
  background: var(--bg-soft);
  border: 1px solid var(--border);
  color: var(--text-primary);
  font-weight: 800;
}

.footer {
  padding: 54px 0 28px;
  background: #0f1730;
  color: rgba(255, 255, 255, 0.72);
}

.footer-inner {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 42px;
  align-items: start;
}

.footer-brand {
  margin-bottom: 18px;
}

.footer-brand span {
  color: #fff;
}

.footer p {
  margin: 0;
  max-width: 560px;
  line-height: 1.85;
}

.footer-cols {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 28px;
}

.footer-cols h4 {
  margin: 0 0 16px;
  color: #fff;
  font-size: 1.08rem;
}

.footer-cols a,
.footer-cols span {
  display: block;
  margin-bottom: 14px;
  color: rgba(255, 255, 255, 0.62);
}

.footer-note {
  width: min(calc(100% - 48px), var(--container));
  margin: 34px auto 0;
  padding-top: 26px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px 18px;
  color: rgba(255, 255, 255, 0.46);
}

.footer-note a {
  color: rgba(255, 255, 255, 0.72);
}

.mobile-action-bar {
  display: none;
}

.site-download-float {
  position: fixed;
  right: 18px;
  bottom: 18px;
  z-index: 70;
  display: grid;
  grid-template-columns: auto auto auto;
  gap: 10px;
  align-items: center;
  max-width: min(calc(100vw - 36px), 520px);
  padding: 10px;
  border: 1px solid rgba(228, 233, 242, 0.92);
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.97);
  box-shadow: 0 16px 38px rgba(12, 22, 44, 0.18);
  backdrop-filter: blur(12px);
}

.site-download-float-text {
  display: grid;
  gap: 2px;
  min-width: 112px;
}

.site-download-float-text strong {
  color: var(--text-primary);
  font-size: 0.95rem;
}

.site-download-float-text span {
  color: var(--text-muted);
  font-size: 0.78rem;
  font-weight: 700;
}

.site-download-float a,
.site-download-float button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 40px;
  padding: 0 14px;
  border: 0;
  border-radius: 12px;
  font: inherit;
  font-size: 0.92rem;
  font-weight: 900;
  white-space: nowrap;
}

.site-download-float a {
  background: var(--primary);
  color: #fff;
}

.site-download-float button {
  background: var(--navy);
  color: #fff;
  cursor: pointer;
}

@media (max-width: 1100px) {
  .nav {
    gap: 22px;
  }

  .hero-inner,
  .wechat-banner,
  .download-panel,
  .footer-inner {
    grid-template-columns: 1fr;
  }

  .hero-showcase {
    grid-template-columns: minmax(220px, 320px) minmax(240px, 1fr);
    justify-content: center;
  }

  .hero-contact {
    max-width: 560px;
  }
}

@media (max-width: 900px) {
  .features-grid,
  .screenshots-grid,
  .testimonials-grid,
  .faq-list,
  .footer-cols {
    grid-template-columns: 1fr;
  }

  .nav {
    display: none;
  }

  .hero-points {
    gap: 12px 16px;
  }

  .hero-copy h1 {
    font-size: 3.15rem;
  }

  .section-header h2,
  .wechat-banner h2 {
    font-size: 2.25rem;
  }
}

@media (max-width: 720px) {
  .header,
  .section-inner,
  .hero-inner,
  .footer-inner,
  .footer-note {
    width: min(calc(100% - 32px), var(--container));
  }

  .header {
    height: 76px;
  }

  .header-inner {
    justify-content: center;
  }

  .brand {
    font-size: 1.25rem;
    gap: 10px;
  }

  .brand img {
    width: 36px;
    height: 36px;
    border-radius: 10px;
  }

  .features,
  .wechat-section,
  .screenshots,
  .testimonials,
  .faq,
  .download {
    padding: 64px 0;
  }

  .hero {
    padding: 34px 0 48px;
  }

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

  .hero-showcase {
    grid-template-columns: 1fr;
    gap: 18px;
  }

  .hero-phone {
    width: min(82vw, 310px);
    justify-self: center;
    border-width: 7px;
    border-radius: 30px;
  }

  .hero-phone-caption {
    left: 10px;
    right: 10px;
    bottom: 10px;
    padding: 10px 12px;
  }

  .hero-copy h1 {
    font-size: 2.55rem;
    line-height: 1.12;
  }

  .hero-copy p {
    margin-bottom: 26px;
    font-size: 1rem;
    line-height: 1.75;
  }

  .hero-badge,
  .section-badge {
    max-width: 100%;
    min-height: 32px;
    white-space: normal;
    line-height: 1.35;
  }

  .section-header {
    margin-bottom: 28px;
    text-align: left;
  }

  .section-header h2,
  .wechat-banner h2 {
    font-size: 1.8rem;
    line-height: 1.18;
  }

  .hero-actions {
    flex-direction: column;
  }

  .hero-actions .btn {
    width: 100%;
  }

  .hero-points {
    gap: 10px;
    flex-direction: column;
    align-items: flex-start;
  }

  .hero-points span {
    width: 100%;
  }

  .hero-contact-card {
    align-items: stretch;
    border-radius: 22px;
  }

  .hero-contact {
    max-width: min(100%, 420px);
    justify-self: center;
  }

  .hero-contact-card strong {
    font-size: 1.05rem;
  }

  .copy-btn,
  .copy-link {
    min-width: 72px;
    min-height: 42px;
  }

  .wechat-row {
    flex-wrap: wrap;
    border-radius: 22px;
  }

  .wechat-row strong {
    width: 100%;
    margin-right: 0;
    font-size: 1.2rem;
  }

  .feature-card,
  .testimonial-card,
  .faq-item,
  .download-panel {
    padding: 20px;
    border-radius: 18px;
  }

  .hero-contact-card,
  .wechat-row {
    padding: 16px 16px 16px 18px;
  }

  .hero-contact-card {
    border-radius: 24px;
  }

  .hero-copy h1 {
    font-size: 2.5rem;
  }

  .hero-actions {
    gap: 12px;
  }

  .btn,
  .nav-cta {
    min-height: 52px;
    padding: 0 20px;
  }

  .features-grid,
  .screenshots-grid,
  .testimonials-grid,
  .faq-list {
    gap: 16px;
  }

  .feature-card {
    min-height: auto;
  }

  .feature-card h3 {
    font-size: 1.25rem;
  }

  .feature-card p,
  .testimonial-card p,
  .faq-item p {
    font-size: 0.98rem;
    line-height: 1.72;
  }

  .feature-icon {
    width: 56px;
    height: 56px;
    margin-bottom: 18px;
    border-radius: 14px;
    font-size: 1.55rem;
  }

  .screenshots-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .screenshot-item {
    border-radius: 18px;
  }

  .screenshot-overlay {
    padding: 42px 14px 14px;
  }

  .screenshot-overlay h3 {
    font-size: 1rem;
  }

  .screenshot-overlay p {
    font-size: 0.86rem;
    line-height: 1.45;
  }

  .download-panel {
    align-items: stretch;
  }

  .download-panel .btn {
    width: 100%;
  }

  .download-gate {
    min-height: auto;
    padding: 24px 0 98px;
  }

  .download-gate-inner {
    width: min(calc(100% - 32px), var(--container));
    grid-template-columns: 1fr;
    gap: 14px;
  }

  .download-gate-copy h1 {
    font-size: 2.05rem;
  }

  .download-gate-copy p {
    margin-bottom: 14px;
    font-size: 0.98rem;
    line-height: 1.65;
  }

  .download-gate-actions .btn,
  .download-gate-actions button {
    width: 100%;
  }

  .invite-code-box {
    grid-template-columns: 1fr;
    justify-items: start;
    gap: 8px;
    margin-bottom: 14px;
    padding: 14px;
    border-radius: 16px;
  }

  .invite-code-box strong {
    font-size: 2rem;
  }

  .invite-code-box button {
    width: 100%;
  }

  .download-gate-card {
    grid-template-columns: 42px minmax(0, 1fr);
    justify-items: start;
    align-items: center;
    gap: 8px 12px;
    padding: 12px;
    border-radius: 16px;
    text-align: left;
  }

  .download-gate-card img {
    grid-row: span 3;
    width: 8px;
    height: 8px;
    border-radius: 2px;
  }

  .download-gate-card strong {
    font-size: 1rem;
  }

  .download-gate-card span {
    font-size: 0.88rem;
    line-height: 1.35;
  }

  .invite-mini {
    padding: 0;
    background: transparent;
    font-size: 0.9rem;
  }

  .download-gate-card a {
    display: none;
  }

  .footer {
    padding-bottom: 92px;
  }

  .site-download-float {
    left: 12px;
    right: 12px;
    bottom: 12px;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
    border-radius: 16px;
  }

  .site-download-float-text {
    grid-column: 1 / -1;
    display: flex;
    justify-content: space-between;
    gap: 10px;
    min-width: 0;
  }

  .site-download-float a,
  .site-download-float button {
    width: 100%;
    min-height: 42px;
  }

  .footer-cols {
    gap: 16px;
  }

  .footer-note {
    justify-content: flex-start;
    text-align: left;
    gap: 8px 14px;
    font-size: 0.9rem;
  }

  .mobile-action-bar {
    display: none;
  }

  .mobile-action-bar a,
  .mobile-action-bar button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 44px;
    border: 0;
    border-radius: 12px;
    background: var(--primary);
    color: #fff;
    font: inherit;
    font-weight: 900;
  }

  .mobile-action-bar button {
    background: var(--navy);
  }
}

@media (max-width: 420px) {
  .header,
  .section-inner,
  .hero-inner,
  .footer-inner,
  .footer-note {
    width: min(calc(100% - 24px), var(--container));
  }

  .hero-copy h1 {
    font-size: 2.18rem;
  }

  .section-header h2,
  .wechat-banner h2 {
    font-size: 1.58rem;
  }

  .hero-contact-card {
    display: grid;
    grid-template-columns: 1fr auto;
  }

  .hero-download-card {
    padding: 18px;
    border-radius: 20px;
  }

  .hero-download-card a {
    width: 100%;
  }

  .conversion-panel {
    grid-template-columns: 1fr;
    padding: 22px;
    border-radius: 20px;
  }

  .conversion-panel a {
    width: 100%;
  }

  .hero-phone {
    width: min(78vw, 280px);
  }

  .hero-phone-caption {
    display: grid;
    justify-items: start;
    gap: 2px;
  }

  .copy-btn {
    min-width: 64px;
    padding: 0 12px;
  }

  .wechat-row .copy-link {
    width: 100%;
  }
}