:root {
  --bg: hsl(0 0% 100%);
  --fg: hsl(221 36% 11%);
  --muted: hsl(220 10% 46%);
  --line: hsl(220 13% 91%);
  --soft: hsl(210 20% 98%);
  --chip: hsl(220 14% 96%);
  --ice: hsl(211 100% 62%);
  --ice-soft: hsl(211 100% 96%);
  --radius: 1rem;
  --header: 5rem;
  --shadow: 0 24px 60px rgba(18, 24, 38, 0.08);
  color-scheme: light;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--fg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; }

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

button, input { font: inherit; }

.wrap {
  width: min(1120px, calc(100% - 3rem));
  margin: 0 auto;
}

.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 20;
  height: var(--header);
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(226, 229, 235, 0.9);
}

.header-bar {
  height: 100%;
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.brand {
  display: flex;
  align-items: center;
  margin-right: auto;
}

.brand img {
  height: 36px;
  width: auto;
  mix-blend-mode: multiply;
  display: block;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 2rem;
  font-size: 0.92rem;
  font-weight: 500;
}

.site-nav a { color: var(--muted); }

.site-nav a:hover,
.site-nav a[aria-current="page"] { color: var(--fg); }

.nav-toggle {
  display: none;
  border: 1px solid var(--line);
  background: var(--bg);
  border-radius: 999px;
  padding: 0.4rem 0.9rem;
  cursor: pointer;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 999px;
  padding: 0.7rem 1.4rem;
  font-size: 0.92rem;
  font-weight: 500;
  border: 1px solid transparent;
  transition: transform 0.15s ease, background 0.15s ease;
}

.btn:active { transform: scale(0.98); }

.btn-dark {
  background: var(--fg);
  color: #fff;
}

.btn-dark:hover { background: hsl(221 36% 18%); }

.btn-light {
  background: var(--soft);
  border-color: var(--line);
}

.btn-light:hover { background: var(--chip); }

.hero {
  position: relative;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  min-height: 100dvh;
  padding: calc(var(--header) + 2.5rem) 0 1.25rem;
  overflow: hidden;
  text-align: center;
}

.hero-glow {
  position: absolute;
  left: 50%;
  top: 42%;
  width: min(900px, 90vw);
  height: 420px;
  transform: translate(-50%, -50%);
  background: radial-gradient(circle, var(--ice-soft) 0%, transparent 68%);
  pointer-events: none;
}

.hero-inner {
  position: relative;
  width: min(1120px, calc(100% - 3rem));
  margin: 0 auto;
}

.scroll-hint {
  position: relative;
  z-index: 1;
  align-self: center;
  margin-top: auto;
  padding-top: 1.5rem;
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  gap: 0.2rem;
  color: var(--muted);
  font-size: 0.75rem;
  letter-spacing: 0.18em;
  transition: opacity 0.35s ease;
}

.scroll-hint:hover { color: var(--fg); }

.scroll-hint svg {
  animation: hint-bob 1.6s ease-in-out infinite;
}

.scroll-hint.is-away {
  opacity: 0;
  pointer-events: none;
}

@keyframes hint-bob {
  0%, 100% { transform: translateY(0); opacity: 0.45; }
  50% { transform: translateY(6px); opacity: 1; }
}

@media (prefers-reduced-motion: reduce) {
  .scroll-hint svg { animation: none; }
}

.pill {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.35rem 0.9rem;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--soft);
  color: var(--muted);
  font-size: 0.78rem;
}

.dot {
  width: 0.45rem;
  height: 0.45rem;
  border-radius: 50%;
  background: var(--ice);
  flex: 0 0 auto;
}

h1, h2, h3, h4 { line-height: 1.2; letter-spacing: -0.02em; }

h1 {
  margin: 1.5rem 0 1rem;
  font-size: clamp(2.2rem, 5vw, 4.4rem);
}

.lede {
  max-width: 40rem;
  margin: 0 auto 2rem;
  color: var(--muted);
  font-size: 1.05rem;
}

.hero-actions {
  display: flex;
  justify-content: center;
  gap: 0.8rem;
  flex-wrap: wrap;
  margin-bottom: 3rem;
}

.stage {
  text-align: left;
  border: 1px solid var(--line);
  border-radius: 1.5rem;
  overflow: hidden;
  box-shadow: var(--shadow);
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.2), rgba(255, 255, 255, 0.72)),
    radial-gradient(circle at 80% 20%, var(--ice-soft), transparent 36%),
    linear-gradient(135deg, #f7f9fc, #eef4fb);
}

.stage-body {
  min-height: 280px;
  padding: 2rem;
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 1.5rem;
  align-items: end;
}

.stage-kicker {
  margin: 0;
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
}

.stage h3 { margin: 0.3rem 0 0; font-size: 1.6rem; }

.stage-note {
  margin-top: 0.8rem;
  color: var(--muted);
  font-size: 0.92rem;
}

.stage-panel {
  background: rgba(255, 255, 255, 0.86);
  border: 1px solid var(--line);
  border-radius: 1.1rem;
  padding: 1rem;
}

.stage-row {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.75rem 0.2rem;
  border-bottom: 1px solid var(--line);
  font-size: 0.92rem;
}

.stage-row:last-child { border-bottom: 0; }

.stage-row span:last-child { color: var(--muted); }

.hairline {
  height: 1px;
  background: linear-gradient(90deg, transparent, hsl(211 100% 62% / 0.55), transparent);
}

section { padding: 6rem 0; }

.center { text-align: center; }

.eyebrow {
  margin: 0 0 0.6rem;
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
}

h2 { margin: 0 0 1rem; font-size: clamp(1.8rem, 3vw, 3rem); }

.sub {
  margin: 0 auto;
  max-width: 42rem;
  color: var(--muted);
}

.logo-chip {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.2rem;
}

.logo-chip img {
  display: block;
  height: 56px;
  width: auto;
}

.split {
  display: grid;
  grid-template-columns: 5fr 7fr;
  gap: 2rem;
  align-items: center;
  margin-top: 3rem;
  padding: 2rem;
  border: 1px solid var(--line);
  border-radius: 1.5rem;
  background: hsl(210 20% 98% / 0.7);
}

.tag {
  display: inline-block;
  margin-bottom: 0.8rem;
  padding: 0.25rem 0.7rem;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: #fff;
  font-size: 0.78rem;
}

.metrics {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-top: 1.4rem;
  padding-top: 1rem;
  border-top: 1px solid var(--line);
}

.metrics strong { display: block; font-size: 1.15rem; }

.metrics span { color: var(--muted); font-size: 0.82rem; }

.device {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 1.2rem;
  min-height: 280px;
  padding: 1.2rem;
  box-shadow: var(--shadow);
}

.device-bar {
  height: 8px;
  width: 72px;
  margin: 0 auto 1rem;
  border-radius: 999px;
  background: var(--chip);
}

.wave {
  height: 88px;
  border-radius: 0.8rem;
  background:
    linear-gradient(90deg, transparent 0 8%, var(--ice) 8% 10%, transparent 10% 18%, var(--ice) 18% 24%, transparent 24% 40%, var(--ice) 40% 48%, transparent 48% 100%),
    linear-gradient(#f4f7fb, #f4f7fb);
  opacity: 0.85;
}

.device p { color: var(--muted); font-size: 0.82rem; }

.cards, .facts, .modes {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.2rem;
}

.cards { margin-top: 1.5rem; }

.card, .fact, .mode, .info {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 1.4rem;
  padding: 1.5rem;
}

.card h3, .mode h3 { margin: 0.8rem 0 0.4rem; font-size: 1.15rem; }

.card p, .mode p, .fact p, .info p { margin: 0; color: var(--muted); font-size: 0.92rem; }

.card footer {
  margin-top: 1.4rem;
  padding-top: 0.8rem;
  border-top: 1px solid var(--line);
  font-size: 0.8rem;
}

.band {
  background: hsl(210 20% 98% / 0.72);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.band-head {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 1.5rem;
  margin-bottom: 1.5rem;
}

.band-head p { max-width: 22rem; color: var(--muted); }

.hscroll {
  display: flex;
  gap: 1.2rem;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  padding-bottom: 0.6rem;
}

.slide {
  flex: 0 0 20rem;
  scroll-snap-align: start;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 1.4rem;
  padding: 1rem;
}

.thumb {
  height: 150px;
  border-radius: 1rem;
  margin-bottom: 1rem;
  background: linear-gradient(160deg, var(--ice-soft), #fff 70%);
  border: 1px solid var(--line);
}

.thumb-b { background: linear-gradient(160deg, #eef2f7, #fff 72%); }
.thumb-c { background: linear-gradient(160deg, #e7f1fb, #f8fbff 70%); }
.thumb-d { background: linear-gradient(160deg, #f3f5f8, #fff 70%); }

.slide .type {
  color: var(--ice);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.08em;
}

.slide h3 { margin: 0.2rem 0 0.4rem; font-size: 1.05rem; }

.slide p { margin: 0; color: var(--muted); font-size: 0.85rem; }

.about {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: center;
}

.point { display: flex; gap: 0.9rem; margin-top: 1rem; }

.num {
  width: 1.8rem;
  height: 1.8rem;
  border-radius: 50%;
  border: 1px solid var(--line);
  background: var(--soft);
  display: grid;
  place-items: center;
  font-size: 0.72rem;
  flex: 0 0 auto;
}

.point h3 { margin: 0; font-size: 1rem; }

.point p { margin: 0.2rem 0 0; color: var(--muted); font-size: 0.92rem; }

.sheet { padding: 2rem; }

.row {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.9rem 0;
  border-bottom: 1px solid var(--line);
  font-size: 0.92rem;
}

.row span:first-child { color: var(--muted); }

.quote {
  margin-top: 1.4rem;
  padding: 1rem 1.1rem;
  border-radius: 1rem;
  border: 1px solid var(--line);
  background: #fff;
  color: var(--muted);
  font-size: 0.85rem;
}

.contact { background: hsl(210 20% 98% / 0.55); }

.contact-box {
  position: relative;
  overflow: hidden;
  text-align: center;
  border: 1px solid var(--line);
  border-radius: 1.6rem;
  padding: 3rem 1.5rem;
  background: #fff;
  box-shadow: var(--shadow);
}

.contact-box h2 { font-size: clamp(1.7rem, 3vw, 2.4rem); }

.modes, .infos { text-align: left; margin: 2rem 0; }

.infos {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
}

.info { background: var(--soft); }

.info .label { margin: 0 0 0.35rem; color: var(--muted); font-size: 0.78rem; }

.info strong { display: block; margin-bottom: 0.35rem; }

.placeholder { color: var(--muted); font-weight: 600; }

.page {
  padding: calc(var(--header) + 3rem) 0 4rem;
}

.page article {
  max-width: 46rem;
}

.page h1 { font-size: clamp(2rem, 4vw, 3rem); margin-top: 0; }

.page p { color: var(--muted); }

.site-footer {
  border-top: 1px solid var(--line);
  padding: 2rem 0 2.4rem;
}

.footer-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  color: var(--muted);
  font-size: 0.78rem;
}

.footer-brand img {
  height: 26px;
  width: auto;
  mix-blend-mode: multiply;
}

.footer-links {
  display: flex;
  gap: 1.2rem;
  color: var(--muted);
  font-size: 0.78rem;
}

.footer-links a:hover { color: var(--fg); }

@media (max-width: 860px) {
  .nav-toggle { display: inline-flex; }

  .site-nav {
    display: none;
    position: absolute;
    top: var(--header);
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    padding: 0.4rem 1.5rem 1rem;
    background: #fff;
    border-bottom: 1px solid var(--line);
  }

  .site-nav.is-open { display: flex; }

  .site-nav a {
    width: 100%;
    padding: 0.85rem 0;
    border-bottom: 1px solid var(--line);
  }

  .header-cta { display: none; }

  .stage-body,
  .split,
  .about,
  .cards,
  .modes,
  .infos,
  .band-head {
    grid-template-columns: 1fr;
    display: grid;
  }

  .band-head { display: block; }

  .metrics { grid-template-columns: 1fr; }
}