:root {
  --blue: #3898fc;
  --deep: #0e2144;
  --text: #122033;
  --muted: #697892;
  --card: #ffffff;
  --line: #dfe7f3;
  --glow: rgba(56, 152, 252, .45);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--text);
  background:
    radial-gradient(circle at 10% 0%, rgba(56,152,252,.12), transparent 26rem),
    #f6f9ff;
  font-family: "Segoe UI", "Microsoft YaHei", system-ui, sans-serif;
}

a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }

.glow-follow {
  --mx: 50%;
  --my: 50%;
  position: relative;
  overflow: hidden;
}
.glow-follow::after {
  position: absolute;
  inset: 0;
  z-index: 1;
  border-radius: inherit;
  pointer-events: none;
  background: radial-gradient(280px circle at var(--mx) var(--my), rgba(116,198,255,.36), rgba(56,152,252,.14) 34%, transparent 68%);
  opacity: 0;
  transition: opacity .2s ease;
  content: "";
}
.glow-follow:hover::after { opacity: 1; }
.glow-follow > * { position: relative; z-index: 2; }

.nav {
  position: sticky;
  top: 0;
  z-index: 5;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 16px clamp(18px, 5vw, 72px);
  background: rgba(255,255,255,.82);
  border-bottom: 1px solid rgba(223,231,243,.8);
  backdrop-filter: blur(18px);
}

.brand { display: inline-flex; align-items: center; gap: 12px; font-weight: 800; }
.brand span {
  display: grid;
  width: 42px;
  height: 42px;
  place-items: center;
  border-radius: 13px;
  color: #fff;
  background: linear-gradient(135deg, var(--blue), #74c6ff);
  font-size: 13px;
  line-height: 1;
  box-shadow: 0 12px 28px rgba(56,152,252,.32);
}

.links { display: flex; align-items: center; gap: 20px; color: var(--muted); font-size: 14px; }
.links a:hover { color: var(--blue); }

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(320px, 1.2fr);
  gap: clamp(28px, 5vw, 72px);
  align-items: center;
  min-height: 760px;
  padding: 72px clamp(18px, 5vw, 72px);
  color: #fff;
  background:
    radial-gradient(circle at 15% 20%, rgba(255,255,255,.18), transparent 30%),
    radial-gradient(circle at 85% 25%, rgba(116,198,255,.28), transparent 28%),
    linear-gradient(135deg, var(--blue), var(--deep));
  overflow: hidden;
}

.eyebrow {
  display: inline-flex;
  margin: 0 0 18px;
  padding: 8px 12px;
  border: 1px solid rgba(255,255,255,.24);
  border-radius: 999px;
  color: #dfefff;
  background: rgba(255,255,255,.1);
  font-size: 13px;
}
.eyebrow.dark {
  color: var(--blue);
  border-color: rgba(56,152,252,.22);
  background: rgba(56,152,252,.1);
}

h1 { margin: 0; font-size: clamp(46px, 7vw, 88px); line-height: 1.05; letter-spacing: -2px; }
.lead { max-width: 620px; margin: 26px 0 0; color: #d9ebff; font-size: 18px; line-height: 1.8; }
.actions { display: flex; flex-wrap: wrap; gap: 14px; margin: 36px 0 18px; }
.actions a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 148px;
  padding: 14px 20px;
  border-radius: 999px;
  font-weight: 800;
  transition: transform .18s ease, box-shadow .18s ease;
}
.actions a:hover { transform: translateY(-3px); }
.primary { color: var(--blue); background: #fff; box-shadow: 0 18px 38px rgba(0,0,0,.22); }
.secondary { color: #fff; border: 1px solid rgba(255,255,255,.32); background: rgba(255,255,255,.1); }
.actions a:hover { box-shadow: 0 18px 42px var(--glow), 0 0 0 1px rgba(255,255,255,.25) inset; }
.version { color: #cbe2ff; font-size: 14px; }

.hero-shot {
  padding: 12px;
  border: 1px solid rgba(255,255,255,.22);
  border-radius: 24px;
  background: rgba(255,255,255,.13);
  box-shadow: 0 38px 90px rgba(0,0,0,.32);
  transform: perspective(1200px) rotateY(-7deg) rotateX(4deg);
  transition: transform .7s cubic-bezier(.2,.8,.2,1), box-shadow .7s cubic-bezier(.2,.8,.2,1);
}
.hero-shot img { border-radius: 16px; }
.hero-shot:hover {
  transform: perspective(1200px) rotateY(-3deg) rotateX(1deg) translateY(-14px);
  box-shadow: 0 46px 110px rgba(0,0,0,.38), 0 0 70px rgba(116,198,255,.36);
}

.section { padding: 86px clamp(18px, 5vw, 72px); }
.section h2 { margin: 0 0 38px; text-align: center; font-size: clamp(30px, 4vw, 48px); letter-spacing: -1px; }
.section-lead { max-width: 720px; margin: -20px auto 34px; color: var(--muted); text-align: center; line-height: 1.8; }
.alt { background: #fff; }

.cards {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 22px;
}
.cards article {
  padding: 30px;
  border: 1px solid var(--line);
  border-radius: 24px;
  background: var(--card);
  box-shadow: 0 18px 50px rgba(25,69,122,.08);
  transition: transform .24s ease, box-shadow .24s ease, border-color .24s ease;
}
.cards article:hover {
  transform: translateY(-8px);
  border-color: rgba(56,152,252,.36);
  box-shadow: 0 26px 70px rgba(56,152,252,.16), 0 0 34px rgba(56,152,252,.18);
}
.cards span { color: var(--blue); font-weight: 900; }
.cards h3 { margin: 18px 0 12px; font-size: 24px; }
.cards p { margin: 0; color: var(--muted); line-height: 1.8; }

.showcase {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(300px, .65fr);
  gap: clamp(28px, 5vw, 56px);
  align-items: center;
}
.screen-stack {
  position: relative;
  min-height: 410px;
  perspective: 1200px;
}
.screen-img {
  position: absolute;
  left: 50%;
  top: 50%;
  width: min(86%, 760px);
  height: auto;
  border: 1px solid rgba(223,231,243,.92);
  border-radius: 18px;
  background: #fff;
  box-shadow: 0 24px 60px rgba(14,33,68,.18);
  transition: transform .7s cubic-bezier(.2,.8,.2,1), box-shadow .7s cubic-bezier(.2,.8,.2,1);
}
.screen-img:nth-child(1) { z-index: 4; transform: translate(-50%, -50%) rotate(-1deg); }
.screen-img:nth-child(2) { z-index: 3; transform: translate(-48%, -54%) rotate(2deg); }
.screen-img:nth-child(3) { z-index: 2; transform: translate(-52%, -46%) rotate(-3deg); }
.screen-stack:hover .screen-img:nth-child(1) { transform: translate(-57%, -57%) rotate(-6deg); }
.screen-stack:hover .screen-img:nth-child(2) { transform: translate(-44%, -53%) rotate(5deg); }
.screen-stack:hover .screen-img:nth-child(3) { transform: translate(-56%, -39%) rotate(-8deg); }
.screen-stack:hover .screen-img { box-shadow: 0 34px 80px rgba(14,33,68,.24); }
.screen-copy {
  padding: 28px;
  border: 1px solid var(--line);
  border-radius: 24px;
  background: linear-gradient(180deg, #fff, #f8fbff);
  box-shadow: 0 18px 50px rgba(25,69,122,.08);
}
.screen-copy h3 { margin: 0 0 12px; font-size: 26px; }
.screen-copy p, .screen-copy li { color: var(--muted); line-height: 1.8; }
.screen-copy ul { margin: 16px 0 0; padding-left: 20px; }

.extension-section {
  display: grid;
  grid-template-columns: minmax(280px, .85fr) minmax(260px, 420px);
  gap: clamp(28px, 6vw, 72px);
  align-items: center;
  background:
    radial-gradient(circle at 88% 20%, rgba(56,152,252,.14), transparent 24rem),
    #f6f9ff;
}
.extension-copy h2 {
  margin: 12px 0 18px;
  text-align: left;
}
.extension-copy p:not(.eyebrow) {
  max-width: 620px;
  color: var(--muted);
  font-size: 18px;
  line-height: 1.85;
}
.extension-frame {
  width: min(100%, 420px);
  border-radius: 22px;
  box-shadow: 0 24px 70px rgba(14,33,68,.18);
  transition: transform .45s cubic-bezier(.2,.8,.2,1), box-shadow .45s cubic-bezier(.2,.8,.2,1);
}
.extension-shot {
  width: min(100%, 420px);
  height: auto;
  border: 1px solid rgba(223,231,243,.92);
  border-radius: 22px;
  background: #fff;
}
.extension-frame:hover {
  transform: rotate(2deg) translateY(-12px);
  box-shadow: 0 34px 90px rgba(14,33,68,.26), 0 0 48px rgba(56,152,252,.28);
}

.install {
  background:
    radial-gradient(circle at 10% 20%, rgba(56,152,252,.14), transparent 28%),
    linear-gradient(180deg, #f6f9ff, #edf5ff);
}
.steps {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}
.steps div {
  display: flex;
  gap: 16px;
  padding: 24px;
  border-radius: 20px;
  background: #fff;
  box-shadow: 0 18px 44px rgba(25,69,122,.08);
}
.steps b {
  display: grid;
  flex: 0 0 38px;
  height: 38px;
  place-items: center;
  border-radius: 12px;
  color: #fff;
  background: var(--blue);
}
.steps p { margin: 7px 0 0; color: var(--muted); line-height: 1.7; }

footer {
  display: flex;
  justify-content: center;
  gap: 18px;
  padding: 26px;
  color: var(--muted);
  border-top: 1px solid var(--line);
  background: #fff;
}
footer a:hover { color: var(--blue); }

@media (max-width: 900px) {
  .hero { grid-template-columns: 1fr; min-height: auto; }
  .hero-shot { transform: none; }
  .cards, .steps, .showcase, .extension-section { grid-template-columns: 1fr; }
  .screen-stack { min-height: 360px; }
  .screen-img { width: 92%; }
  .extension-copy h2 { text-align: center; }
  .extension-frame { margin: 0 auto; }
  .links { display: none; }
  footer { flex-direction: column; align-items: center; }
}