:root {
  color-scheme: light;
  --bg: #f6faf7;
  --surface: #ffffff;
  --surface-soft: #eef8f4;
  --surface-mist: #f2f8f5;
  --ink: #17211c;
  --muted: #5f7067;
  --line: #dce8e1;
  --line-strong: #bdd4c9;
  --green: #0d9488;
  --green-dark: #126654;
  --blue: #3f6f91;
  --accent: #c96649;
  --shadow: 0 24px 70px rgba(36, 69, 52, 0.11);
  --soft-shadow: 0 18px 45px rgba(36, 69, 52, 0.08);
  --ring: rgba(13, 148, 136, 0.34);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-width: 320px;
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  font-size: 16px;
  line-height: 1.75;
  letter-spacing: 0;
}

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

a:focus-visible,
summary:focus-visible {
  outline: 3px solid var(--ring);
  outline-offset: 3px;
  border-radius: 6px;
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(246, 250, 247, 0.88);
  border-bottom: 1px solid rgba(220, 232, 225, 0.72);
  backdrop-filter: blur(18px);
}

.nav,
.hero,
.section,
.download-band,
.footer-inner {
  width: min(1120px, calc(100% - 40px));
  margin: 0 auto;
}

.nav {
  height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
}

.brand-icon {
  width: 34px;
  height: 34px;
  border-radius: 8px;
  box-shadow: 0 8px 22px rgba(20, 80, 54, 0.18);
}

.nav-links {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 22px;
  color: var(--muted);
  font-size: 14px;
  white-space: nowrap;
}

.nav-links > a,
.secondary-link,
.footer-inner a,
.store-badge,
.support-grid a {
  transition: color 180ms ease, border-color 180ms ease, background 180ms ease, box-shadow 180ms ease, transform 180ms ease;
}

.nav-links > a:hover,
.secondary-link:hover,
.footer-inner a:hover {
  color: var(--green-dark);
}

.language-menu {
  position: relative;
}

.language-menu summary {
  cursor: pointer;
  list-style: none;
  color: var(--ink);
}

.language-menu summary::-webkit-details-marker {
  display: none;
}

.language-menu summary::after {
  content: "";
  display: inline-block;
  width: 7px;
  height: 7px;
  margin-left: 7px;
  border-right: 1.5px solid currentColor;
  border-bottom: 1.5px solid currentColor;
  transform: translateY(-3px) rotate(45deg);
}

.language-popover {
  position: absolute;
  right: 0;
  top: calc(100% + 12px);
  min-width: 148px;
  padding: 8px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.language-popover a,
.language-popover span {
  display: block;
  padding: 7px 10px;
  border-radius: 6px;
}

.language-popover a:hover {
  background: var(--surface-soft);
  color: var(--green-dark);
}

.active-language {
  color: var(--green-dark);
  background: var(--surface-soft);
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(420px, 1.1fr);
  gap: 58px;
  align-items: center;
  padding: 112px 0 96px;
}

.hero-copy {
  min-width: 0;
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--green-dark);
  font-size: 13px;
  font-weight: 700;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: 22px;
  font-size: 72px;
  line-height: 1.04;
  font-weight: 800;
  overflow-wrap: break-word;
}

h2 {
  margin-bottom: 18px;
  font-size: 42px;
  line-height: 1.18;
}

h3 {
  margin-bottom: 10px;
  font-size: 20px;
  line-height: 1.35;
}

.hero-text,
.section-heading p,
.download-band p {
  color: var(--muted);
  font-size: 18px;
}

.hero-text {
  max-width: 620px;
  margin-bottom: 28px;
}

.hero-actions {
  display: flex;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
  margin-bottom: 0;
}

.store-download {
  display: inline-grid;
  gap: 8px;
}

.store-badge {
  display: inline-block;
  width: 190px;
  min-height: 56px;
}

.store-badge:hover {
  transform: translateY(-1px);
}

.store-badge img {
  width: 190px;
  height: auto;
}

.store-note {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.4;
}

.secondary-link {
  color: var(--green-dark);
  font-weight: 700;
}

.hero-visual {
  min-width: 0;
}

.device-mockup {
  display: block;
  width: 100%;
  height: auto;
  margin: 0 auto;
}

.hero-mockup {
  max-width: 760px;
}

.section {
  padding: 86px 0;
}

.section-heading {
  max-width: 730px;
  margin-bottom: 34px;
}

.section-heading.compact {
  margin-bottom: 26px;
}

.feature-grid,
.plan-grid,
.support-grid {
  display: grid;
  gap: 16px;
}

.feature-grid {
  gap: 38px;
}

.plan-card,
.support-grid a {
  background: var(--surface);
  border-radius: 8px;
  box-shadow: 0 12px 30px rgba(36, 69, 52, 0.04);
}

.feature-card {
  display: grid;
  grid-template-columns: minmax(0, 0.78fr) minmax(390px, 1fr);
  gap: 46px;
  align-items: center;
  min-height: 0;
  padding: 34px;
  background: var(--surface);
  border-radius: 8px;
  box-shadow: var(--soft-shadow);
}

.feature-card:nth-child(even) {
  grid-template-columns: minmax(390px, 1fr) minmax(0, 0.78fr);
}

.feature-card:nth-child(even) .feature-copy {
  order: 2;
}

.feature-card:nth-child(even) .feature-visual {
  order: 1;
}

.feature-copy {
  min-width: 0;
}

.feature-mark {
  display: inline-grid;
  place-items: center;
  width: 42px;
  height: 42px;
  margin: 0 0 18px;
  color: var(--green-dark);
  background: var(--surface-soft);
  border: 1px solid rgba(13, 148, 136, 0.26);
  border-radius: 999px;
  font-size: 13px;
  font-weight: 800;
}

.feature-card:nth-child(2n) .feature-mark {
  color: var(--blue);
  background: rgba(63, 111, 145, 0.08);
  border-color: rgba(63, 111, 145, 0.22);
}

.feature-card h3 {
  margin-bottom: 14px;
  font-size: 26px;
}

.feature-card p {
  max-width: 430px;
  margin: 0;
  font-size: 17px;
}

.feature-card p,
.plan-card p,
.plan-card li {
  color: var(--muted);
}

.feature-visual {
  min-width: 0;
}

.feature-mockup {
  max-width: 560px;
}

.plan-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.plan-card {
  position: relative;
  overflow: hidden;
  padding: 26px;
}

.highlighted-plan {
  box-shadow: var(--soft-shadow);
}

.plan-card ul {
  display: grid;
  gap: 8px;
  margin: 18px 0 0;
  padding-left: 20px;
}

.support-section {
  padding-top: 56px;
}

.support-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.support-grid a {
  position: relative;
  min-height: 132px;
  padding: 22px 42px 22px 22px;
  color: var(--green-dark);
  font-weight: 700;
}

.support-grid a::after {
  content: "";
  position: absolute;
  top: 27px;
  right: 22px;
  width: 9px;
  height: 9px;
  border-top: 2px solid currentColor;
  border-right: 2px solid currentColor;
  transform: rotate(45deg);
  opacity: 0.62;
}

.support-grid a:hover {
  border-color: var(--line-strong);
  background: var(--surface-mist);
  box-shadow: 0 10px 24px rgba(36, 69, 52, 0.06);
  transform: translateY(-1px);
}

.support-grid span {
  display: block;
  margin-bottom: 18px;
  color: var(--ink);
  font-size: 18px;
}

.download-band {
  position: relative;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
  margin-bottom: 80px;
  padding: 34px 34px 34px 40px;
  background: var(--surface);
  border-radius: 8px;
  box-shadow: var(--soft-shadow);
}

.download-band h2 {
  max-width: 680px;
  margin-bottom: 0;
}

.download-band .eyebrow {
  color: var(--green-dark);
}

.site-footer {
  border-top: 1px solid var(--line);
  background: var(--bg);
}

.footer-inner {
  display: grid;
  justify-items: center;
  gap: 6px;
  padding: 34px 0 38px;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.5;
  text-align: center;
}

.footer-records {
  display: grid;
  gap: 6px;
}

.footer-records p {
  margin: 0;
}

.police-record {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
}

.copyright {
  margin: 0;
}

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

  .hero {
    gap: 42px;
    padding: 62px 0 70px;
  }

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

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

  h1 {
    font-size: 58px;
  }

  h2 {
    font-size: 36px;
  }

  .feature-card {
    grid-template-columns: 1fr;
    gap: 28px;
  }

  .feature-card:nth-child(even) {
    grid-template-columns: 1fr;
  }

  .feature-card:nth-child(even) .feature-copy,
  .feature-card:nth-child(even) .feature-visual {
    order: initial;
  }

  .feature-card p {
    max-width: 620px;
  }
}

@media (max-width: 720px) {
  .nav,
  .hero,
  .section,
  .download-band,
  .footer-inner {
    width: min(100% - 28px, 1120px);
  }

  .nav {
    height: auto;
    min-height: 68px;
    align-items: flex-start;
    padding: 14px 0;
  }

  .nav-links {
    flex-wrap: wrap;
    row-gap: 6px;
    column-gap: 14px;
    white-space: normal;
  }

  .hero {
    padding-bottom: 58px;
  }

  h1 {
    font-size: 42px;
    line-height: 1.12;
  }

  h2 {
    font-size: 30px;
  }

  .hero-text,
  .section-heading p,
  .download-band p {
    font-size: 16px;
  }

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

  .feature-card {
    padding: 24px;
  }

  .feature-card h3 {
    font-size: 22px;
  }

  .feature-card p {
    font-size: 16px;
  }

  .download-band {
    align-items: flex-start;
    flex-direction: column;
    padding: 24px 24px 24px 30px;
  }

  .section {
    padding: 62px 0;
  }

  .support-section {
    padding-top: 42px;
  }
}

@media (max-width: 460px) {
  .brand span {
    display: none;
  }

  .nav-links {
    font-size: 13px;
    gap: 10px;
  }

  h1 {
    font-size: 34px;
  }

  .hero-actions {
    align-items: flex-start;
    flex-direction: column;
  }

  .store-badge,
  .store-badge img {
    width: 172px;
  }

  .feature-card {
    padding: 20px;
  }

  .footer-records {
    max-width: 100%;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }

  html {
    scroll-behavior: auto;
  }
}