@charset "UTF-8";

:root {
  --bg: #f4f6f8;
  --paper: #ffffff;
  --ink: #16191d;
  --mute: #66707a;
  --line: rgba(22, 25, 29, 0.12);
  --accent: #2f6fed;
  --deep: #111418;
  --header-h: 72px;
  --nav-shadow: 2px 2px 0 rgba(22, 25, 29, 0.22);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  min-width: 320px;
  color: var(--ink);
  background:
    radial-gradient(circle at 80% 0%, rgba(47, 111, 237, 0.08), transparent 32%),
    linear-gradient(180deg, #eef2f6 0%, var(--bg) 40%, #fafbfc 100%);
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  line-height: 1.65;
}
body.menu-open { overflow: hidden; }
img { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
ul { margin: 0; padding: 0; list-style: none; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }

.header-inner, .page-shell {
  width: min(calc(100% - 36px), 1120px);
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  height: var(--header-h);
  background: rgba(244, 246, 248, 0.94);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(8px);
}
.header-inner {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  height: var(--header-h);
  column-gap: 18px;
}
.site-brand { display: flex; align-items: center; gap: 10px; min-width: 0; }
.site-brand img {
  width: 40px; height: 40px;
  object-fit: contain;
  background: #fff;
  box-shadow: var(--nav-shadow);
  flex: 0 0 auto;
}
.brand-copy { display: flex; flex-direction: column; line-height: 1.15; min-width: 0; }
.brand-copy strong {
  font-size: 16px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.brand-copy span { color: var(--mute); font-size: 12px; }
.site-nav { justify-self: center; min-width: 0; }
.site-nav ul {
  display: flex;
  justify-content: center;
  gap: 18px;
  font-size: 14px;
  font-weight: 700;
}
.site-nav a { white-space: nowrap; }
.site-nav a.is-active,
.site-nav a:hover { color: var(--accent); }
.desk-get { justify-self: end; }
.desk-get, .mobile-download, .primary-action, .download-panel a {
  display: inline-flex;
  min-height: 40px;
  align-items: center;
  justify-content: center;
  padding: 0 16px;
  color: #fff;
  background: var(--accent);
  font-weight: 800;
  font-size: 13px;
  box-shadow: var(--nav-shadow);
  white-space: nowrap;
}
.primary-action, .download-panel a { min-height: 50px; min-width: 160px; font-size: 15px; }
.mobile-actions { display: none; align-items: center; gap: 8px; }
.menu-toggle {
  width: 40px; height: 40px;
  display: grid;
  place-content: center;
  border: 1px solid var(--ink);
}
.icon-menu {
  display: block;
  width: 16px; height: 2px;
  background: var(--ink);
  box-shadow: 0 5px 0 var(--ink), 0 -5px 0 var(--ink);
}

.hero {
  position: relative;
  padding: 56px 0 72px;
  overflow: hidden;
}
.hero-orbit {
  position: absolute;
  border: 1px solid rgba(47, 111, 237, 0.16);
  border-radius: 50%;
  pointer-events: none;
}
.hero-orbit-one {
  width: 420px; height: 420px;
  right: -80px; top: -60px;
  animation: drift 12s linear infinite;
}
.hero-orbit-two {
  width: 260px; height: 260px;
  right: 40px; top: 40px;
  animation: drift 18s linear infinite reverse;
}
@keyframes drift {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}
.hero-grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(240px, 0.8fr);
  gap: 28px;
  align-items: center;
}
.hero-kicker, .section-kicker {
  display: inline-block;
  margin-bottom: 10px;
  color: var(--accent);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.12em;
}
h1 {
  margin: 0;
  font-size: clamp(34px, 5vw, 52px);
  line-height: 1.05;
}
.hero-lead {
  margin: 12px 0;
  font-size: clamp(20px, 2.6vw, 28px);
  font-weight: 800;
  line-height: 1.3;
}
.hero-summary { margin: 0 0 22px; color: var(--mute); max-width: 520px; }
.hero-action-stack { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; }
.age-label { color: var(--mute); font-size: 12px; }

.phone-shell {
  width: min(240px, 100%);
  margin-inline: auto;
  padding: 14px 12px 18px;
  background: #1a1e24;
  border-radius: 28px;
  box-shadow: 10px 14px 0 rgba(22, 25, 29, 0.16);
}
.phone-speaker {
  width: 72px; height: 6px;
  margin: 0 auto 12px;
  border-radius: 999px;
  background: #3a414b;
}
.phone-screen {
  overflow: hidden;
  background: #fff;
  border-radius: 18px;
}
.phone-screen img {
  width: 100%;
  height: auto;
  max-height: 420px;
  object-fit: cover;
}

.section-heading { margin-bottom: 22px; }
.section-heading h2 { margin: 0 0 8px; font-size: 30px; }
.section-heading p { margin: 0; color: var(--mute); }
.section-heading.light .section-kicker { color: #9db7ff; }
.section-heading.light p { color: #a9b3c0; }

.channel-section { padding: 68px 0; }
.channel-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}
.channel-card {
  position: relative;
  padding: 20px 18px;
  background: var(--paper);
  border: 1px solid var(--line);
  box-shadow: 0 1px 0 rgba(22, 25, 29, 0.04);
}
.channel-card:hover { border-color: rgba(47, 111, 237, 0.35); }
.channel-card-top {
  display: flex;
  gap: 10px;
  align-items: baseline;
  margin-bottom: 8px;
  font-weight: 800;
}
.channel-card-top span { color: var(--accent); }
.channel-card p { margin: 0; color: var(--mute); }
.channel-stamp {
  display: inline-block;
  margin-top: 14px;
  color: var(--mute);
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.12em;
}

.broadcast-section {
  padding: 68px 0;
  background: var(--deep);
  color: #eef2f6;
}
.broadcast-console {
  padding: 18px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.08);
}
.broadcast-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 16px;
}
.broadcast-tabs button {
  min-height: 40px;
  padding: 0 14px;
  border: 1px solid rgba(255, 255, 255, 0.16);
  color: #d5dde8;
  font-weight: 800;
  font-size: 13px;
}
.broadcast-tabs button.is-active,
.broadcast-tabs button:hover {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}
.broadcast-panel h3 { margin: 0 0 8px; font-size: 22px; }
.broadcast-panel p { margin: 0; color: #b7c2d0; max-width: 680px; }

.screens-section { padding: 68px 0; background: #fff; }
.screenshot-row {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
}
.screenshot-row figure {
  margin: 0;
  padding: 12px;
  background: var(--bg);
  border: 1px solid var(--line);
}
.screenshot-row img {
  width: 100%;
  max-width: 188px;
  height: auto;
  max-height: 420px;
  margin: 0 auto;
  object-fit: contain;
}
.screenshot-row figcaption {
  margin-top: 8px;
  text-align: center;
  font-size: 13px;
  font-weight: 800;
}

.guide-section { padding: 68px 0; background: #e9eef4; }
.faq-list { display: grid; gap: 8px; }
.faq-item button {
  display: flex;
  width: 100%;
  min-height: 56px;
  align-items: center;
  padding: 0 16px;
  text-align: left;
  font-weight: 800;
  background: #fff;
  border: 1px solid var(--line);
}
.faq-item button:hover { color: var(--accent); }
.faq-answer {
  padding: 0 16px 16px;
  color: var(--mute);
  background: #fff;
  border: 1px solid var(--line);
  border-top: 0;
}

.reviews-section { padding: 68px 0; }
.review-list { display: grid; gap: 0; border-top: 2px solid var(--ink); }
.review-list article {
  display: grid;
  grid-template-columns: 170px 1fr 88px;
  gap: 16px;
  align-items: start;
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
}
.review-list time {
  color: var(--accent);
  font-size: 12px;
  font-weight: 800;
}
.review-list p { margin: 0; }
.review-list span {
  font-size: 13px;
  font-weight: 800;
  color: var(--mute);
  text-align: right;
}

.download-section { padding: 28px 0 64px; }
.download-panel {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 20px;
  align-items: center;
  padding: 24px;
  background: var(--paper);
  border: 1px solid var(--line);
  box-shadow: 8px 8px 0 rgba(47, 111, 237, 0.12);
}
.download-panel h2 { margin: 0 0 6px; }
.download-panel p { margin: 0; color: var(--mute); }
.download-panel a { background: var(--deep); }

.site-footer {
  padding: 32px 0 18px;
  background: #0c0e11;
  color: #d9e0e8;
}
.footer-row {
  height: auto;
  padding-top: 8px;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 16px;
  align-items: center;
}
.footer-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  justify-content: flex-end;
  font-size: 13px;
  font-weight: 800;
}
.footer-nav a:hover { color: #9db7ff; }
.copyright {
  width: min(calc(100% - 36px), 1120px);
  margin: 14px auto 0;
  color: #7d8793;
  font-size: 12px;
}

.back-to-top {
  position: fixed;
  right: 24px;
  bottom: 24px;
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  background: var(--accent);
}
.back-to-top::before {
  content: "";
  width: 12px;
  height: 12px;
  border-left: 2px solid #fff;
  border-top: 2px solid #fff;
  transform: translateY(3px) rotate(45deg);
}
.back-to-top[hidden] { display: none !important; }

@media (max-width: 980px) {
  .header-inner { grid-template-columns: 1fr auto; }
  .desk-get { display: none; }
  .mobile-actions { display: flex; }
  .site-nav {
    position: fixed;
    top: var(--header-h);
    right: 0; left: 0;
    display: none;
    background: #fff;
    border-bottom: 1px solid var(--line);
    justify-self: stretch;
  }
  .site-nav.is-open { display: block; }
  .site-nav ul {
    flex-direction: column;
    gap: 0;
    padding: 8px 18px 16px;
  }
  .site-nav a {
    display: block;
    padding: 12px 0;
    border-bottom: 1px solid var(--line);
  }
  .hero-grid { display: flex; flex-direction: column; gap: 28px; }
  .hero-copy { text-align: center; }
  .hero-summary { margin-inline: auto; }
  .hero-action-stack { justify-content: center; }
  .channel-grid, .screenshot-row, .download-panel, .footer-row, .review-list article {
    grid-template-columns: 1fr;
  }
  .review-list span { text-align: left; }
  .primary-action, .download-panel a { width: 100%; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .hero-orbit { animation: none; }
}