:root {
  --brand: #15a66a;
  --brand-dark: #0f8c62;
  --bg: #eef3f1;
  --surface: #ffffff;
  --surface-soft: #f7faf8;
  --text: #17211b;
  --muted: #68746d;
  --line: #dfe8e3;
  --shadow: 0 18px 48px rgba(24, 45, 35, 0.12);
  --font: "PingFang SC", "HarmonyOS Sans SC", "Noto Sans CJK SC", "Microsoft YaHei UI", "Microsoft YaHei", Arial,
    sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font);
  color: var(--text);
  background: var(--bg);
}

img {
  max-width: 100%;
  display: block;
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 16px clamp(18px, 5vw, 72px);
  background: rgba(248, 250, 249, 0.92);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(12px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  font-size: 18px;
}

.brand-mark {
  width: 38px;
  height: 38px;
  border-radius: 13px;
  display: inline-grid;
  place-items: center;
  color: #fff;
  background: linear-gradient(145deg, var(--brand), var(--brand-dark));
  font-weight: 900;
  box-shadow: 0 10px 28px rgba(21, 166, 106, 0.22);
}

.nav {
  display: flex;
  align-items: center;
  gap: 18px;
  color: var(--muted);
  font-size: 14px;
  white-space: nowrap;
}

.nav a:hover,
.text-link {
  color: var(--brand-dark);
}

.hero {
  min-height: calc(100vh - 72px);
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(280px, 0.75fr);
  gap: clamp(28px, 6vw, 84px);
  align-items: center;
  padding: clamp(48px, 8vw, 96px) clamp(18px, 5vw, 72px);
}

.hero-copy {
  max-width: 680px;
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--brand-dark);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  overflow-wrap: anywhere;
}

h1 {
  margin: 0;
  font-size: clamp(54px, 11vw, 118px);
  line-height: 0.95;
  letter-spacing: 0;
}

h2 {
  margin: 0;
  font-size: clamp(28px, 4vw, 48px);
  letter-spacing: 0;
}

h3 {
  margin: 0 0 8px;
}

.lead {
  margin: 24px 0 0;
  font-size: clamp(22px, 3vw, 34px);
  line-height: 1.25;
  font-weight: 800;
}

.summary,
.notice,
.download-panel p,
.feature-grid p,
.security li,
.doc-page p,
.doc-page li {
  color: var(--muted);
  line-height: 1.8;
}

.summary {
  max-width: 600px;
  margin: 18px 0 0;
  font-size: 17px;
}

.download-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 28px 0 0;
}

.download-button {
  min-height: 48px;
  padding: 0 20px;
  border: 0;
  border-radius: 8px;
  background: var(--brand);
  color: #fff;
  font: inherit;
  font-weight: 800;
  cursor: not-allowed;
  opacity: 0.78;
}

.download-button.secondary {
  background: #293d34;
}

.notice {
  max-width: 560px;
  margin: 16px 0 0;
  font-size: 14px;
}

.phone-preview {
  max-width: 330px;
  justify-self: center;
  padding: 12px;
  border-radius: 36px;
  background: #f8faf9;
  box-shadow: var(--shadow);
  border: 1px solid var(--line);
}

.phone-preview img,
.screenshots img {
  border-radius: 26px;
}

.section,
.download-panel {
  padding: clamp(48px, 8vw, 96px) clamp(18px, 5vw, 72px);
}

.section-heading {
  max-width: 760px;
  margin-bottom: 26px;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 14px;
}

.feature-grid article,
.download-panel,
.doc-page section {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 22px;
  box-shadow: 0 8px 28px rgba(24, 45, 35, 0.06);
}

.feature-grid span {
  width: 42px;
  height: 42px;
  display: grid;
  place-items: center;
  margin-bottom: 16px;
  border-radius: 8px;
  color: #fff;
  background: var(--brand);
  font-weight: 900;
}

.screenshots {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(16px, 4vw, 34px);
}

.screenshots figure {
  margin: 0;
  padding: 12px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.screenshots figcaption {
  padding: 14px 6px 4px;
  color: var(--muted);
  font-weight: 700;
  text-align: center;
}

.download-panel {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 28px;
  margin: 0 clamp(18px, 5vw, 72px);
}

.security ul,
.doc-page ul {
  margin: 0;
  padding-left: 20px;
}

.security li + li,
.doc-page li + li {
  margin-top: 8px;
}

.footer {
  padding: 34px clamp(18px, 5vw, 72px);
  border-top: 1px solid var(--line);
  color: var(--muted);
  background: #f8faf9;
}

.footer-links {
  display: flex;
  gap: 18px;
  flex-wrap: wrap;
  margin-bottom: 12px;
  font-weight: 700;
}

.doc-page {
  max-width: 900px;
  margin: 0 auto;
  padding: clamp(42px, 8vw, 84px) 18px;
}

.doc-page h1 {
  font-size: clamp(36px, 8vw, 72px);
  margin-bottom: 20px;
}

.doc-note {
  padding: 18px;
  border-radius: 8px;
  background: #eaf7ef;
  border: 1px solid #cdeade;
}

.doc-page section {
  margin-top: 18px;
}

.not-found {
  min-height: 100vh;
  display: grid;
  place-content: center;
  text-align: center;
}

@media (max-width: 980px) {
  .hero,
  .download-panel {
    grid-template-columns: 1fr;
  }

  .feature-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

  .phone-preview {
    max-width: 300px;
  }
}

@media (max-width: 680px) {
  .site-header {
    align-items: flex-start;
    flex-direction: column;
  }

  .nav {
    width: 100%;
    overflow-x: auto;
    padding-bottom: 2px;
  }

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

  .download-button {
    width: 100%;
  }

  .hero {
    padding-top: 34px;
  }
}