:root {
  --bg: #f4fbfb;
  --paper: #ffffff;
  --ink: #12343a;
  --muted: #5d7479;
  --line: #d7ecec;
  --accent: #1aa7b8;
  --accent-2: #0e7f8d;
  --hero: #ecf8f8;
  --shadow: 0 18px 48px rgba(18, 70, 78, .08);
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: "PingFang SC", "Microsoft YaHei", Inter, system-ui, sans-serif;
  color: var(--ink);
  background: var(--bg);
  font-size: 16px;
  line-height: 1.7;
}
a { color: inherit; text-decoration: none; }
.mt-wrap { width: min(1120px, calc(100% - 32px)); margin: 0 auto; }
.mt-nav {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(244, 251, 251, .92);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(18, 70, 78, .06);
}
.mt-nav-inner {
  min-height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.mt-logo, .mt-links { display: flex; align-items: center; gap: 18px; }
.mt-mark {
  width: 42px;
  height: 42px;
  border-radius: 12px;
  display: block;
  object-fit: cover;
  background: #fff;
  box-shadow: 0 1px 6px rgba(18, 70, 78, .12);
}
.mt-logo strong, .mt-logo small { display: block; }
.mt-logo strong { font-size: 18px; line-height: 1.2; }
.mt-logo small { color: var(--muted); font-size: 12px; }
.mt-links a {
  color: #3d5b61;
  font-size: 14px;
  padding: 6px 0;
}
.mt-hero {
  padding: 56px 0 28px;
  background:
    radial-gradient(circle at 88% 12%, rgba(36, 194, 211, .18), transparent 28%),
    linear-gradient(180deg, #f7fdfd, var(--hero) 70%, var(--bg));
}
.mt-hero-grid {
  display: grid;
  grid-template-columns: 1.05fr .95fr;
  gap: 48px;
  align-items: center;
}
.mt-kicker {
  margin: 0 0 12px;
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 2px;
  color: var(--accent-2);
  text-transform: none;
}
.mt-kicker.dark { color: var(--accent-2); }
.mt-hero h1 {
  margin: 0;
  font-size: 64px;
  line-height: 1.05;
  letter-spacing: -.04em;
}
.mt-en {
  margin: 8px 0 18px;
  font-size: 22px;
  color: #4e7c84;
  letter-spacing: .08em;
}
.mt-lead {
  margin: 0;
  max-width: 540px;
  font-size: 18px;
  color: var(--muted);
}
.mt-hero-actions { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 28px; }
.mt-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 22px;
  border-radius: 999px;
  border: 0;
  font: inherit;
  cursor: pointer;
}
.mt-btn-primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #fff;
  box-shadow: 0 12px 24px rgba(16, 140, 154, .22);
}
.mt-btn-ghost {
  background: #fff;
  color: var(--ink);
  border: 1px solid var(--line);
}
.mt-btn[disabled] { opacity: .55; cursor: not-allowed; }
.mt-phone-shell {
  background: #10282d;
  color: #fff;
  border-radius: 36px;
  padding: 22px 18px 18px;
  box-shadow: 0 30px 70px rgba(10, 42, 48, .22);
}
.mt-phone-bar span, .mt-phone-stats span { color: #9ec4c9; font-size: 12px; }
.mt-phone-bar b { display: block; font-size: 52px; line-height: 1; margin: 4px 0; }
.mt-phone-bar small { color: #7fb4bc; }
.mt-phone-chart { height: 108px; margin: 18px 0; }
.mt-phone-chart svg { width: 100%; height: 100%; }
.mt-phone-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
}
.mt-phone-stats div {
  background: rgba(255,255,255,.06);
  border-radius: 16px;
  padding: 12px;
}
.mt-phone-stats b { display: block; font-size: 20px; }
.mt-section { padding: 72px 0; }
.mt-section.alt { background: #fff; }
.mt-section h2, .mt-download h2 {
  margin: 0 0 16px;
  font-size: 36px;
  line-height: 1.2;
}
.mt-intro {
  max-width: 720px;
  color: var(--muted);
  font-size: 18px;
  margin: 0 0 28px;
}
.mt-intro-grid, .mt-feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}
.mt-feature-grid { grid-template-columns: repeat(4, 1fr); }
.mt-intro-grid article, .mt-feature-grid article {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 22px;
  padding: 22px;
  box-shadow: var(--shadow);
}
.mt-section.alt .mt-feature-grid article { background: var(--hero); }
.mt-intro-grid h3, .mt-feature-grid h3 { margin: 0 0 8px; font-size: 20px; }
.mt-intro-grid p, .mt-feature-grid p, .mt-steps p { margin: 0; color: var(--muted); }
.mt-feature-grid span {
  display: inline-block;
  margin-bottom: 18px;
  color: var(--accent-2);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 1px;
}
.mt-steps {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
  counter-reset: step;
}
.mt-steps li {
  position: relative;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 22px;
  padding: 24px 22px 22px 22px;
}
.mt-steps li::before {
  counter-increment: step;
  content: counter(step);
  display: grid;
  place-items: center;
  width: 32px;
  height: 32px;
  margin-bottom: 14px;
  border-radius: 10px;
  background: #dff6f7;
  color: var(--accent-2);
  font-weight: 800;
}
.mt-steps b { display: block; margin-bottom: 8px; font-size: 18px; }
.mt-download {
  padding: 28px 0 84px;
}
.mt-download-inner {
  background: linear-gradient(135deg, #12343a, #1a5962 58%, #0f7d8a);
  color: #fff;
  border-radius: 32px;
  padding: 42px 36px;
  text-align: center;
}
.mt-download-icon {
  width: 72px;
  height: 72px;
  border-radius: 18px;
  display: block;
  margin: 0 auto 18px;
  background: #fff;
  box-shadow: 0 10px 24px rgba(0, 0, 0, .18);
}
.mt-download .mt-kicker { color: #9ee7ee; }
.mt-download p { margin: 0 auto 24px; max-width: 520px; color: #d5eef1; }
.mt-download .mt-btn-primary {
  background: #fff;
  color: #12343a;
  min-width: 220px;
}
.mt-download small { display: block; margin-top: 14px; color: #b7dce1; }
.mt-footer {
  padding: 28px 0 48px;
  color: var(--muted);
  font-size: 14px;
}
.mt-footer-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 8px;
}
.mt-footer-brand img {
  width: 28px;
  height: 28px;
  border-radius: 8px;
  object-fit: cover;
  background: #fff;
}
.mt-footer strong { display: block; color: var(--ink); font-size: 16px; }
.mt-footer p { margin: 0; }
@media (max-width: 960px) {
  .mt-hero-grid, .mt-intro-grid, .mt-feature-grid, .mt-steps { grid-template-columns: 1fr; }
  .mt-hero { padding-top: 32px; }
  .mt-hero h1 { font-size: 44px; }
  .mt-section, .mt-download { padding-top: 48px; }
  .mt-section h2, .mt-download h2 { font-size: 28px; }
  .mt-download-inner { padding: 28px 20px; }
}
@media (max-width: 640px) {
  .mt-links { display: none; }
  .mt-hero-actions .mt-btn, .mt-download .mt-btn { width: 100%; }
}