:root {
  --text: #f4f6fb;
  --muted: rgba(233, 238, 248, 0.62);
  --line: rgba(255, 255, 255, 0.12);
  --glass: rgba(255, 255, 255, 0.06);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "PingFang SC",
    "Hiragino Sans GB", "Helvetica Neue", "Microsoft YaHei", sans-serif;
  color-scheme: dark;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  min-height: 100vh;
  color: var(--text);
  background: #06070f;
  overflow-x: hidden;
}

a {
  color: inherit;
  text-decoration: none;
}

.bg {
  position: fixed;
  inset: 0;
  z-index: 0;
  overflow: hidden;
  background: #06070f;
}

.blob {
  position: absolute;
  border-radius: 50%;
  filter: blur(90px);
}

.b1 {
  width: 46vmax;
  height: 46vmax;
  left: -14vmax;
  top: -16vmax;
  background: radial-gradient(circle, var(--tint-a, #4f7cff), transparent 70%);
  opacity: 0.55;
}

.b2 {
  width: 40vmax;
  height: 40vmax;
  right: -12vmax;
  top: 8vmax;
  background: radial-gradient(circle, var(--tint-b, #a855f7), transparent 70%);
  opacity: 0.5;
}

.b3 {
  width: 44vmax;
  height: 44vmax;
  left: 18vmax;
  bottom: -22vmax;
  background: radial-gradient(circle, #ff7a45, transparent 70%);
  opacity: 0.4;
}

.wrap {
  position: relative;
  z-index: 1;
  max-width: 1000px;
  margin: 0 auto;
  padding: clamp(20px, 4vh, 40px) 22px 64px;
}

.top {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: clamp(30px, 7vh, 64px);
}

.back {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  border-radius: 999px;
  font-size: 0.86rem;
  color: var(--muted);
  background: var(--glass);
  border: 1px solid var(--line);
  -webkit-backdrop-filter: blur(18px);
  backdrop-filter: blur(18px);
  transition: color 0.25s ease, border-color 0.25s ease;
}

.back:hover {
  color: var(--text);
  border-color: rgba(255, 255, 255, 0.24);
}

.hero {
  text-align: center;
  margin-bottom: clamp(30px, 6vh, 56px);
}

.kicker {
  display: inline-block;
  font-size: 0.8rem;
  letter-spacing: 0.16em;
  color: var(--accent, #8ec8ff);
  margin-bottom: 16px;
}

.hero h1 {
  font-size: clamp(2rem, 6vw, 3.1rem);
  line-height: 1.14;
  font-weight: 750;
  letter-spacing: -0.01em;
}

.tagline {
  margin-top: 14px;
  font-size: clamp(1rem, 2.4vw, 1.2rem);
  font-weight: 600;
  background: var(--grad, linear-gradient(90deg, #8ec8ff, #b48bff));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.lead {
  margin: 18px auto 0;
  max-width: 620px;
  font-size: 0.98rem;
  line-height: 1.85;
  color: var(--muted);
}

.cta {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
  margin-top: 28px;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: 999px;
  font-size: 0.94rem;
  font-weight: 600;
  border: 1px solid var(--line);
  background: var(--glass);
  -webkit-backdrop-filter: blur(18px);
  backdrop-filter: blur(18px);
  transition: transform 0.25s ease, border-color 0.25s ease, background 0.25s ease;
}

.btn:hover {
  transform: translateY(-1px);
  border-color: rgba(255, 255, 255, 0.26);
}

.btn.primary {
  color: #080b14;
  border-color: transparent;
  background: var(--grad, linear-gradient(135deg, #8ec8ff, #b48bff));
  box-shadow: 0 10px 26px rgba(124, 170, 255, 0.32);
}

.stage {
  display: flex;
  justify-content: center;
  margin-bottom: clamp(34px, 7vh, 64px);
}

.frame {
  position: relative;
  width: min(100%, 395px);
  padding: 10px;
  border-radius: 34px;
  background: rgba(255, 255, 255, 0.07);
  border: 1px solid var(--line);
  -webkit-backdrop-filter: blur(24px) saturate(180%);
  backdrop-filter: blur(24px) saturate(180%);
  box-shadow:
    0 24px 60px rgba(0, 0, 0, 0.42),
    inset 0 1px 0 rgba(255, 255, 255, 0.18);
}

.frame iframe {
  display: block;
  width: 100%;
  height: min(74vh, 820px);
  border: 0;
  border-radius: 26px;
  background: #05060c;
}

.frame.wide {
  width: min(100%, 820px);
}

.frame.wide iframe {
  height: auto;
  aspect-ratio: 16 / 9;
}

.hint {
  margin-top: 16px;
  text-align: center;
  font-size: 0.84rem;
  color: var(--muted);
}

.hint a {
  color: var(--accent, #8ec8ff);
}

.hint a:hover {
  text-decoration: underline;
}

.features h2 {
  font-size: 1.15rem;
  font-weight: 650;
  margin-bottom: 18px;
}

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 14px;
}

.fcard {
  padding: 20px;
  border-radius: 20px;
  background: var(--glass);
  border: 1px solid var(--line);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  backdrop-filter: blur(20px) saturate(180%);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.14);
}

.fcard h3 {
  font-size: 0.98rem;
  font-weight: 650;
  margin-bottom: 8px;
}

.fcard p {
  font-size: 0.88rem;
  line-height: 1.7;
  color: var(--muted);
}

.foot {
  margin-top: 56px;
  padding-top: 22px;
  border-top: 1px solid var(--line);
  text-align: center;
  font-size: 0.8rem;
  color: rgba(233, 238, 248, 0.4);
}

@media (prefers-reduced-motion: reduce) {
  .btn,
  .back {
    transition: none;
  }
}