:root {
  --bg: #fbfbfd;
  --panel: rgba(255, 255, 255, 0.76);
  --text: #111827;
  --muted: #687083;
  --subtle: #8b93a5;
  --line: rgba(17, 24, 39, 0.09);
  --line-strong: rgba(17, 24, 39, 0.14);
  --accent: #2563eb;
  --accent-soft: rgba(37, 99, 235, 0.09);
  --radius: 28px;
  --shadow: 0 28px 80px rgba(15, 23, 42, 0.12), 0 8px 24px rgba(15, 23, 42, 0.06);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Yu Gothic", "Noto Sans CJK JP", sans-serif;
  background: radial-gradient(circle at 50% 0%, #fff 0, #f7f9fc 42%, #fbfbfd 100%);
  color: var(--text);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
a { color: inherit; text-decoration: none; }
.page { min-height: 100vh; overflow: hidden; }
.wrap { width: min(1120px, calc(100% - 40px)); margin: 0 auto; }
.nav {
  height: 76px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 650;
  letter-spacing: -0.03em;
  white-space: nowrap;
}
.brand img { width: 32px; height: 32px; display: block; }
.nav-right { display: flex; align-items: center; gap: 12px; }
.nav-links { display: flex; align-items: center; gap: 18px; color: var(--muted); font-size: 14px; }
.nav-links > a:not(.pill) { transition: color 0.18s ease; }
.nav-links > a:not(.pill):hover { color: var(--text); }
.pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.66);
  -webkit-backdrop-filter: blur(18px);
  backdrop-filter: blur(18px);
  border-radius: 999px;
  padding: 9px 13px;
  color: var(--muted);
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.8) inset;
}

.language-menu { position: relative; }
.language-menu summary {
  list-style: none;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 7px;
  height: 38px;
  padding: 0 11px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.68);
  color: var(--muted);
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.8) inset;
  -webkit-backdrop-filter: blur(18px);
  backdrop-filter: blur(18px);
  font-size: 13px;
  font-weight: 650;
  transition: border-color 0.18s ease, background 0.18s ease, color 0.18s ease;
}
.language-menu summary::-webkit-details-marker { display: none; }
.language-menu[open] summary {
  border-color: rgba(37, 99, 235, 0.24);
  background: rgba(37, 99, 235, 0.08);
  color: var(--text);
}
.globe { width: 18px; height: 18px; fill: currentColor; color: #2563eb; }
.language-panel {
  position: absolute;
  top: calc(100% + 10px);
  right: 0;
  width: 190px;
  padding: 8px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.92);
  box-shadow: 0 20px 60px rgba(15, 23, 42, 0.14), 0 4px 18px rgba(15, 23, 42, 0.08);
  -webkit-backdrop-filter: blur(22px);
  backdrop-filter: blur(22px);
  z-index: 10;
}
.language-option {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 11px;
  border-radius: 12px;
  font-size: 14px;
  color: var(--text);
  transition: background 0.18s ease, color 0.18s ease;
}
.language-option small {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  color: var(--subtle);
  font-size: 12px;
}
.language-option:hover,
.language-option.is-current {
  background: rgba(37, 99, 235, 0.08);
  color: #1d4ed8;
}
.language-option.is-current small { color: var(--accent); }
.current-dot {
  display: none;
  width: 6px;
  height: 6px;
  border-radius: 999px;
  background: var(--accent);
  box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.1);
}
.language-option.is-current .current-dot { display: inline-block; }

.hero { padding: 68px 0 34px; text-align: center; }
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 8px 12px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.72);
  color: #4b5563;
  font-size: 14px;
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.9) inset;
}
.dot { width: 7px; height: 7px; border-radius: 999px; background: #22c55e; box-shadow: 0 0 0 4px rgba(34, 197, 94, 0.12); }
h1 {
  margin: 24px auto 0;
  max-width: 980px;
  font-size: clamp(44px, 7.2vw, 86px);
  line-height: 0.99;
  letter-spacing: -0.075em;
  font-weight: 760;
}
html[lang="zh-CN"] h1,
html[lang="ja"] h1,
html[lang="fr"] h1 { letter-spacing: -0.055em; }
.lead {
  margin: 26px auto 0;
  max-width: 800px;
  font-size: clamp(19px, 2.2vw, 25px);
  line-height: 1.42;
  color: var(--muted);
  letter-spacing: -0.025em;
}
.actions { margin-top: 34px; display: flex; align-items: center; justify-content: center; gap: 12px; flex-wrap: wrap; }
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 18px;
  border-radius: 999px;
  border: 1px solid var(--line-strong);
  font-weight: 600;
  font-size: 15px;
  background: #111827;
  color: #fff;
  box-shadow: 0 10px 28px rgba(17, 24, 39, 0.16);
}
.button.secondary { background: rgba(255, 255, 255, 0.72); color: #1f2937; box-shadow: none; }

.preview { padding: 42px 0 52px; }
.device {
  position: relative;
  border: 1px solid rgba(17, 24, 39, 0.12);
  border-radius: 30px;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.78), rgba(255, 255, 255, 0.62));
  box-shadow: var(--shadow);
  padding: 10px;
  -webkit-backdrop-filter: blur(20px);
  backdrop-filter: blur(20px);
}
.device::before {
  content: "";
  position: absolute;
  inset: -90px -70px auto auto;
  width: 360px;
  height: 260px;
  background: radial-gradient(circle, rgba(59, 130, 246, 0.14), transparent 68%);
  z-index: -1;
}
.device img { display: block; width: 100%; height: auto; border-radius: 22px; }
.caption { margin: 16px auto 0; text-align: center; color: var(--subtle); font-size: 13px; }

.section { padding: 56px 0; }
.split { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
  -webkit-backdrop-filter: blur(18px);
  backdrop-filter: blur(18px);
  padding: 28px;
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.8) inset;
}
.card h2 { margin: 0; font-size: clamp(26px, 3vw, 34px); line-height: 1.08; letter-spacing: -0.045em; }
.card p { margin: 14px 0 0; color: var(--muted); font-size: 17px; line-height: 1.55; }
.features { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 14px; margin-top: 18px; }
.feature { border: 1px solid var(--line); border-radius: 22px; background: rgba(255, 255, 255, 0.58); padding: 22px; min-height: 180px; }
.icon { width: 34px; height: 34px; display: grid; place-items: center; border-radius: 12px; background: var(--accent-soft); color: var(--accent); font-weight: 700; margin-bottom: 18px; }
.feature h3 { margin: 0; font-size: 18px; letter-spacing: -0.02em; }
.feature p { margin: 10px 0 0; color: var(--muted); line-height: 1.55; font-size: 15px; }

.section-head { max-width: 760px; margin: 0 auto 26px; text-align: center; }
.section-eyebrow { margin: 0 0 10px; color: var(--accent); font-size: 13px; font-weight: 700; letter-spacing: 0.08em; text-transform: uppercase; }
.section-head h2 { margin: 0; font-size: clamp(32px, 5vw, 56px); line-height: 1.05; letter-spacing: -0.06em; }
.section-head p:not(.section-eyebrow) { margin: 16px auto 0; max-width: 700px; color: var(--muted); font-size: 18px; line-height: 1.55; }
.map-gallery { padding: 54px 0 72px; }
.map-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; }
.map-card { border: 1px solid var(--line); border-radius: 26px; background: rgba(255, 255, 255, 0.68); box-shadow: 0 1px 0 rgba(255, 255, 255, 0.9) inset; overflow: hidden; }
.map-frame { aspect-ratio: 4 / 3; background: linear-gradient(180deg, rgba(248, 250, 252, 0.9), rgba(255, 255, 255, 0.68)); display: flex; align-items: center; justify-content: center; padding: 10px; border-bottom: 1px solid var(--line); }
.map-frame img { width: 100%; height: 100%; object-fit: contain; display: block; border-radius: 16px; }
.map-copy { padding: 18px 18px 20px; }
.map-copy span { display: inline-flex; margin-bottom: 10px; color: var(--subtle); font-size: 12px; font-weight: 650; letter-spacing: 0.04em; text-transform: uppercase; }
.map-copy h3 { margin: 0; font-size: 18px; letter-spacing: -0.025em; }
.map-copy p { margin: 8px 0 0; color: var(--muted); font-size: 14px; line-height: 1.5; }

.quote { padding: 70px 0 92px; text-align: center; }
.quote h2 { margin: 0 auto; max-width: 860px; font-size: clamp(34px, 5vw, 58px); line-height: 1.05; letter-spacing: -0.06em; }
.quote p { margin: 22px auto 0; max-width: 650px; color: var(--muted); font-size: 19px; line-height: 1.5; }
.footer { border-top: 1px solid var(--line); padding: 28px 0 42px; color: var(--subtle); font-size: 14px; }
.footer .wrap { display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; }

@media (max-width: 820px) {
  .wrap { width: min(100% - 28px, 1120px); }
  .nav { height: 68px; }
  .nav-links a:not(.pill) { display: none; }
  .pill { display: none; }
  .hero { padding-top: 44px; }
  h1 { font-size: 46px; letter-spacing: -0.06em; }
  .lead { font-size: 18px; }
  .split, .features, .map-grid { grid-template-columns: 1fr; }
  .card { padding: 24px; }
  .preview { padding-top: 30px; }
  .device { border-radius: 24px; padding: 7px; }
  .device img { border-radius: 18px; }
  .map-frame { aspect-ratio: 16 / 10; }
  .quote { padding: 54px 0 70px; }
  .footer .wrap { display: block; }
  .footer a { display: inline-block; margin-top: 10px; }
}

@media (max-width: 480px) {
  .wrap { width: min(100% - 24px, 1120px); }
  .nav { gap: 12px; }
  .brand { gap: 9px; }
  .brand img { width: 30px; height: 30px; }
  .language-panel {
    position: fixed;
    top: 62px;
    right: 12px;
    left: 12px;
    width: auto;
  }
  .hero { padding: 34px 0 24px; }
  h1 {
    font-size: clamp(39px, 12vw, 46px);
    line-height: 1.02;
    letter-spacing: -0.055em;
  }
  html[lang="zh-CN"] h1,
  html[lang="ja"] h1,
  html[lang="fr"] h1 { letter-spacing: -0.04em; }
  .lead {
    margin-top: 20px;
    font-size: 18px;
    line-height: 1.5;
  }
  .actions {
    align-items: stretch;
    gap: 10px;
  }
  .button { width: 100%; }
  .preview { padding: 24px 0 44px; }
  .device { border-radius: 20px; padding: 5px; }
  .device img { border-radius: 15px; }
  .section { padding: 44px 0; }
  .card { border-radius: 22px; padding: 22px; }
  .feature { min-height: 0; }
  .section-head h2,
  .quote h2 { letter-spacing: -0.045em; }
  .map-gallery { padding: 44px 0 58px; }
  .map-copy { padding: 16px; }
}