:root {
  color-scheme: light;
  --bg: #f5f8ff;
  --surface: #ffffff;
  --surface-blue: #edf6ff;
  --text: #111827;
  --muted: #657086;
  --muted-2: #8b95a8;
  --line: #e4ebf5;
  --primary: #1677ff;
  --primary-2: #00a2ff;
  --primary-dark: #0756c7;
  --green: #12b981;
  --shadow: 0 24px 70px rgba(20, 78, 160, 0.12);
  --shadow-soft: 0 12px 36px rgba(20, 78, 160, 0.08);
  --radius-xl: 36px;
  --radius: 24px;
  --radius-sm: 16px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--text);
  background:
    radial-gradient(circle at 8% 6%, rgba(22, 119, 255, 0.18), transparent 34rem),
    radial-gradient(circle at 86% 14%, rgba(0, 162, 255, 0.18), transparent 30rem),
    linear-gradient(180deg, #ffffff 0%, var(--bg) 46%, #ffffff 100%);
  font-family:
    Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  line-height: 1.65;
}

a {
  color: var(--primary);
  text-decoration: none;
}

a:hover {
  color: var(--primary-dark);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  border-bottom: 1px solid rgba(228, 235, 245, 0.72);
  background: rgba(255, 255, 255, 0.82);
  backdrop-filter: blur(18px);
}

.nav,
main,
.footer {
  width: min(1180px, calc(100% - 42px));
  margin: 0 auto;
}

.nav {
  display: flex;
  min-height: 78px;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand,
.footer-brand {
  display: inline-flex;
  align-items: center;
  gap: 13px;
  color: var(--text);
}

.brand-icon,
.footer-brand img {
  width: 48px;
  height: 48px;
  border-radius: 15px;
  box-shadow: 0 14px 30px rgba(22, 119, 255, 0.26);
}

.brand-copy {
  display: grid;
  gap: 0;
  line-height: 1.15;
}

.brand-copy strong {
  font-size: 19px;
  letter-spacing: -0.03em;
}

.brand-copy small {
  color: var(--muted-2);
  font-size: 12px;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.12em;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 24px;
  font-size: 15px;
  font-weight: 800;
}

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

.nav-links a:hover,
.nav-links .nav-cta {
  color: var(--primary);
}

.nav-cta {
  padding: 10px 16px;
  border: 1px solid rgba(22, 119, 255, 0.24);
  border-radius: 999px;
  background: rgba(22, 119, 255, 0.08);
}

.language-toggle {
  display: inline-flex;
  min-height: 40px;
  align-items: center;
  gap: 6px;
  padding: 0 14px;
  border: 1px solid rgba(22, 119, 255, 0.22);
  border-radius: 999px;
  background: #ffffff;
  color: var(--primary);
  cursor: pointer;
  font: inherit;
  font-size: 14px;
  font-weight: 950;
  box-shadow: 0 10px 26px rgba(20, 78, 160, 0.08);
}

.language-toggle:hover {
  border-color: rgba(22, 119, 255, 0.42);
  color: var(--primary-dark);
}

.language-toggle small {
  color: var(--muted-2);
  font-size: 12px;
  font-weight: 900;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 380px;
  gap: 32px;
  align-items: stretch;
  padding: 86px 0 34px;
}

.hero-copy,
.hero-panel,
.feature-card,
details,
.steps,
.security-card,
.template-box,
.contact {
  border: 1px solid rgba(228, 235, 245, 0.92);
  background: rgba(255, 255, 255, 0.88);
  box-shadow: var(--shadow);
}

.hero-copy {
  position: relative;
  overflow: hidden;
  padding: 62px;
  border-radius: var(--radius-xl);
}

.hero-copy::after {
  position: absolute;
  right: -120px;
  bottom: -120px;
  width: 320px;
  height: 320px;
  border-radius: 999px;
  background: linear-gradient(135deg, rgba(22, 119, 255, 0.14), rgba(0, 162, 255, 0.04));
  content: "";
}

.status-pill {
  position: relative;
  z-index: 1;
  display: inline-flex;
  align-items: center;
  gap: 9px;
  margin-bottom: 22px;
  padding: 8px 13px;
  border: 1px solid rgba(22, 119, 255, 0.16);
  border-radius: 999px;
  background: rgba(22, 119, 255, 0.08);
  color: var(--primary-dark);
  font-size: 13px;
  font-weight: 900;
}

.status-pill span {
  width: 8px;
  height: 8px;
  border-radius: 999px;
  background: var(--green);
  box-shadow: 0 0 0 5px rgba(18, 185, 129, 0.14);
}

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

h1 {
  position: relative;
  z-index: 1;
  max-width: 760px;
  margin-bottom: 22px;
  font-size: clamp(44px, 6.2vw, 76px);
  line-height: 0.96;
  letter-spacing: -0.075em;
}

h2 {
  margin-bottom: 14px;
  font-size: clamp(30px, 4.2vw, 48px);
  line-height: 1.08;
  letter-spacing: -0.05em;
}

h3 {
  margin-bottom: 10px;
  font-size: 20px;
  letter-spacing: -0.02em;
}

.hero-subtitle {
  position: relative;
  z-index: 1;
  max-width: 720px;
  margin-bottom: 32px;
  color: var(--muted);
  font-size: 19px;
}

.hero-actions {
  position: relative;
  z-index: 1;
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-bottom: 22px;
}

.button {
  display: inline-flex;
  min-height: 50px;
  align-items: center;
  justify-content: center;
  padding: 0 22px;
  border-radius: 999px;
  font-weight: 900;
}

.button.primary {
  background: linear-gradient(135deg, var(--primary), var(--primary-2));
  color: #ffffff;
  box-shadow: 0 16px 32px rgba(22, 119, 255, 0.28);
}

.button.secondary {
  border: 1px solid rgba(22, 119, 255, 0.18);
  background: #ffffff;
  color: var(--primary);
}

.safe-note {
  position: relative;
  z-index: 1;
  margin-bottom: 0;
  color: #2f6d59;
  font-size: 14px;
  font-weight: 800;
}

.hero-panel {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  min-height: 430px;
  padding: 28px;
  border-radius: var(--radius-xl);
  background:
    linear-gradient(180deg, rgba(22, 119, 255, 0.1), rgba(255, 255, 255, 0.82)),
    rgba(255, 255, 255, 0.88);
}

.phone-card {
  display: grid;
  place-items: center;
  gap: 16px;
  min-height: 230px;
  border-radius: 30px;
  background: linear-gradient(145deg, #0c75ff, #079cff);
  color: #ffffff;
  text-align: center;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.24);
}

.phone-card img {
  width: 94px;
  height: 94px;
  border-radius: 28px;
  box-shadow: 0 18px 34px rgba(0, 35, 100, 0.22);
}

.phone-card strong {
  display: block;
  font-size: 24px;
  line-height: 1.1;
}

.phone-card span {
  color: rgba(255, 255, 255, 0.78);
  font-size: 13px;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.panel-grid {
  display: grid;
  gap: 12px;
  margin-top: 18px;
}

.panel-grid div {
  padding: 16px;
  border: 1px solid rgba(228, 235, 245, 0.9);
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.82);
}

.panel-grid small,
.eyebrow {
  color: var(--primary);
  font-size: 12px;
  font-weight: 950;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.panel-grid strong,
.panel-grid a {
  display: block;
  margin-top: 4px;
  color: var(--text);
  font-weight: 900;
}

.section {
  padding: 78px 0 0;
}

.section-heading {
  max-width: 790px;
  margin-bottom: 30px;
}

.section-heading p:not(.eyebrow),
.feature-card p,
.faq-list p,
.steps li,
.security-card li,
.contact p {
  color: var(--muted);
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
}

.feature-card {
  min-height: 220px;
  padding: 26px;
  border-radius: var(--radius);
  transition:
    transform 0.2s ease,
    box-shadow 0.2s ease;
}

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 26px 80px rgba(20, 78, 160, 0.14);
}

.feature-icon {
  display: inline-flex;
  width: 42px;
  height: 42px;
  align-items: center;
  justify-content: center;
  margin-bottom: 22px;
  border-radius: 14px;
  background: var(--surface-blue);
  color: var(--primary);
  font-size: 13px;
  font-weight: 950;
}

.faq-section {
  display: grid;
  grid-template-columns: 0.72fr 1fr;
  gap: 42px;
  align-items: start;
}

.faq-list {
  display: grid;
  gap: 12px;
}

details {
  overflow: hidden;
  border-radius: 20px;
  box-shadow: var(--shadow-soft);
}

summary {
  cursor: pointer;
  padding: 20px 22px;
  font-weight: 950;
  list-style-position: outside;
}

details p {
  margin: 0;
  padding: 0 22px 22px;
}

.troubleshoot {
  display: grid;
  grid-template-columns: 0.76fr 1fr;
  gap: 42px;
  align-items: start;
}

.steps {
  display: grid;
  gap: 14px;
  margin: 0;
  padding: 30px 30px 30px 54px;
  border-radius: var(--radius);
}

.steps li::marker {
  color: var(--primary);
  font-weight: 950;
}

.security-card {
  padding: 30px;
  border-radius: var(--radius);
}

.security-card ul {
  margin: 0 0 24px;
  padding-left: 22px;
}

.template-box {
  display: grid;
  gap: 10px;
  padding: 30px;
  border-radius: var(--radius);
  background:
    linear-gradient(135deg, rgba(22, 119, 255, 0.92), rgba(0, 162, 255, 0.9)),
    #1677ff;
  color: #ffffff;
}

.template-box p {
  margin: 0;
  color: rgba(255, 255, 255, 0.86);
}

.template-box strong {
  color: #ffffff;
}

.contact {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
  margin-top: 48px;
  padding: 36px;
  border-radius: var(--radius-xl);
}

.contact p {
  max-width: 720px;
  margin-bottom: 0;
}

.footer {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 24px;
  align-items: start;
  margin-top: 94px;
  padding: 34px 0 48px;
  border-top: 1px solid var(--line);
  color: var(--muted);
}

.footer-brand img {
  width: 46px;
  height: 46px;
}

.footer-brand strong {
  display: block;
  color: var(--text);
  font-size: 18px;
}

.footer-brand p {
  margin: 0;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  font-weight: 900;
}

.copyright {
  grid-column: 1 / -1;
  margin-bottom: 0;
  font-size: 13px;
}

@media (max-width: 940px) {
  .nav {
    align-items: flex-start;
    flex-direction: column;
    padding: 16px 0;
  }

  .nav-links {
    flex-wrap: wrap;
    gap: 12px;
  }

  .language-toggle {
    min-height: 38px;
  }

  .hero,
  .faq-section,
  .troubleshoot {
    grid-template-columns: 1fr;
  }

  .hero {
    padding-top: 42px;
  }

  .hero-copy {
    padding: 38px;
  }

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

  .contact,
  .footer {
    align-items: stretch;
    flex-direction: column;
    grid-template-columns: 1fr;
  }

  .contact {
    margin-top: 36px;
  }
}

@media (max-width: 560px) {
  .nav,
  main,
  .footer {
    width: min(100% - 28px, 1180px);
  }

  .brand-icon {
    width: 42px;
    height: 42px;
    border-radius: 13px;
  }

  .nav-links {
    font-size: 14px;
  }

  .nav-links a,
  .language-toggle {
    flex: 1 1 auto;
  }

  .hero-copy {
    padding: 28px;
    border-radius: 28px;
  }

  h1 {
    font-size: 42px;
  }

  .hero-subtitle {
    font-size: 17px;
  }

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

  .button {
    width: 100%;
  }

  .contact {
    margin-top: 30px;
  }
}