:root {
  --ink: #14213d;
  --muted: #64748b;
  --line: #dbe4ee;
  --paper: #ffffff;
  --surface: #f6f9fc;
  --blue: #2563eb;
  --blue-dark: #1746aa;
  --blue-soft: #eaf1ff;
  --green: #0f9f76;
  --green-soft: #e6f7f1;
  --orange: #e96514;
  --orange-soft: #fff0e6;
  --shadow: 0 20px 50px rgba(26, 49, 83, 0.12);
  --content: 1180px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 17px;
  line-height: 1.7;
  letter-spacing: 0;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
a:focus-visible, button:focus-visible, summary:focus-visible {
  outline: 3px solid rgba(37, 99, 235, 0.35);
  outline-offset: 3px;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 76px;
  padding: 12px max(24px, calc((100vw - var(--content)) / 2));
  background: rgba(255, 255, 255, 0.96);
  border-bottom: 1px solid rgba(219, 228, 238, 0.9);
  backdrop-filter: blur(16px);
}

.brand { display: flex; align-items: center; gap: 12px; min-width: 210px; }
.brand img { border-radius: 11px; box-shadow: 0 5px 14px rgba(37, 99, 235, 0.18); }
.brand span { display: flex; flex-direction: column; line-height: 1.25; }
.brand strong { font-size: 17px; }
.brand small { margin-top: 4px; color: var(--muted); font-size: 12px; }

.main-nav { display: flex; align-items: center; gap: 8px; }
.main-nav a {
  padding: 9px 13px;
  color: #475569;
  font-size: 15px;
  font-weight: 650;
  border-radius: 6px;
}
.main-nav a:hover { color: var(--blue); background: var(--blue-soft); }
.main-nav a.is-active { color: var(--blue); background: var(--blue-soft); }
.main-nav .language-link {
  min-width: 42px;
  margin-left: 6px;
  color: var(--ink);
  text-align: center;
  border: 1px solid var(--line);
}
.main-nav .language-link:hover { color: #fff; background: var(--ink); border-color: var(--ink); }

.hero {
  display: grid;
  grid-template-columns: minmax(0, 0.88fr) minmax(520px, 1.12fr);
  min-height: min(680px, calc(100vh - 110px));
  max-width: 1440px;
  margin: 0 auto;
  overflow: hidden;
  background: #eef5ff;
  border-bottom: 1px solid var(--line);
}

.hero-copy {
  position: relative;
  z-index: 2;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 72px clamp(32px, 6vw, 88px);
  background: #eef5ff;
}

.eyebrow, .section-kicker {
  margin: 0 0 14px;
  color: var(--green);
  font-size: 14px;
  font-weight: 800;
}

h1, h2, h3, p { margin-top: 0; }
h1, h2, h3 { line-height: 1.22; }

.hero h1 {
  margin-bottom: 24px;
  font-size: 64px;
  font-weight: 850;
  word-break: keep-all;
}

.hero-lead { max-width: 610px; color: #50627c; font-size: 20px; line-height: 1.75; }
.hero-actions { display: flex; align-items: center; gap: 14px; margin-top: 14px; }

.store-badge {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  min-height: 56px;
  padding: 8px 17px;
  color: #fff;
  background: #111827;
  border-radius: 7px;
}
.store-mark {
  display: grid;
  place-items: center;
  width: 30px;
  height: 30px;
  font-size: 20px;
  font-weight: 800;
  border: 2px solid #fff;
  border-radius: 7px;
}
.store-badge span:last-child { display: flex; flex-direction: column; line-height: 1.05; }
.store-badge small { font-size: 10px; }
.store-badge strong { margin-top: 4px; font-size: 18px; }

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 11px 19px;
  font-size: 15px;
  font-weight: 750;
  border: 1px solid transparent;
  border-radius: 7px;
  transition: transform 160ms ease, box-shadow 160ms ease, background 160ms ease;
}
.button:hover { transform: translateY(-1px); }
.button-primary { color: #fff; background: var(--blue); box-shadow: 0 10px 24px rgba(37, 99, 235, 0.22); }
.button-primary:hover { background: var(--blue-dark); }
.button-secondary { color: var(--blue); background: #fff; border-color: #c8d7ef; }
.button-secondary:hover { background: var(--blue-soft); }

.hero-facts {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 22px;
  margin: 28px 0 0;
  padding: 0;
  color: #5e7089;
  font-size: 13px;
  list-style: none;
}
.hero-facts li::before { content: ""; display: inline-block; width: 7px; height: 7px; margin-right: 8px; background: var(--green); border-radius: 50%; }

.hero-product {
  position: relative;
  display: grid;
  place-items: center;
  min-height: min(680px, calc(100vh - 110px));
  padding: 54px 5vw 0 18px;
  overflow: hidden;
  background: #d9e8ff;
}
.hero-product::before, .hero-product::after {
  content: "";
  position: absolute;
  background: #f5a461;
}
.hero-product::before { top: 7%; right: 8%; width: 82px; height: 12px; }
.hero-product::after { bottom: 9%; left: 5%; width: 12px; height: 82px; background: #48b994; }
.hero-product img {
  width: min(700px, 94%);
  border: 10px solid #17233b;
  border-bottom-width: 18px;
  border-radius: 24px 24px 12px 12px;
  box-shadow: 0 40px 80px rgba(20, 33, 61, 0.28);
  transform: translateY(12%) rotate(1.2deg);
}

.section { padding: 104px max(24px, calc((100vw - var(--content)) / 2)); }
.section-heading { max-width: 900px; margin-bottom: 48px; }
.section-heading.narrow { max-width: 760px; }
.section-heading h2, .trust-band h2, .support-cta h2 {
  margin-bottom: 18px;
  font-size: clamp(34px, 4vw, 52px);
  font-weight: 820;
}
.section-heading > p:last-child { color: var(--muted); font-size: 19px; }

.problem-band { background: var(--surface); }
.scenario-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.scenario-grid article {
  padding: 28px;
  background: #fff;
  border: 1px solid var(--line);
  border-top: 4px solid var(--blue);
  border-radius: 7px;
}
.scenario-grid article:nth-child(2) { border-top-color: var(--orange); }
.scenario-grid article:nth-child(3) { border-top-color: var(--green); }
.scenario-number { color: var(--blue); font-size: 13px; font-weight: 800; }
.scenario-grid h3 { margin: 24px 0 10px; font-size: 23px; }
.scenario-grid p { margin: 0; color: var(--muted); }

.feature-row {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(500px, 1.1fr);
  align-items: center;
  gap: 70px;
  padding: 66px 0;
  border-top: 1px solid var(--line);
}
.feature-row-reverse .feature-copy { order: 2; }
.feature-copy h3 { margin: 16px 0 18px; font-size: clamp(30px, 3vw, 42px); }
.feature-copy > p { color: var(--muted); font-size: 18px; }
.feature-tag { display: inline-block; padding: 5px 10px; font-size: 13px; font-weight: 800; border-radius: 5px; }
.tag-orange { color: var(--orange); background: var(--orange-soft); }
.tag-green { color: var(--green); background: var(--green-soft); }
.tag-blue { color: var(--blue); background: var(--blue-soft); }

.check-list { margin: 24px 0 0; padding: 0; list-style: none; }
.check-list li { position: relative; margin: 10px 0; padding-left: 29px; }
.check-list li::before {
  content: "✓";
  position: absolute;
  left: 0;
  top: 2px;
  color: var(--green);
  font-weight: 900;
}

.screen-figure { margin: 0; }
.screen-figure img { border: 1px solid #bdcadd; border-radius: 7px; box-shadow: var(--shadow); }
.screen-figure figcaption { margin-top: 14px; color: var(--muted); font-size: 13px; text-align: center; }

.trust-band { display: grid; grid-template-columns: 0.9fr 1.1fr; gap: 70px; color: #fff; background: #13233f; }
.trust-band .eyebrow { color: #75dfbd; }
.trust-points { display: grid; gap: 14px; }
.trust-points p { display: grid; grid-template-columns: 170px 1fr; gap: 18px; margin: 0; padding: 20px 0; border-bottom: 1px solid rgba(255, 255, 255, 0.16); }
.trust-points strong { color: #fff; }
.trust-points span { color: #b9c7da; }

.support-cta { padding: 96px 24px; text-align: center; background: #eef5ff; }
.support-cta p:not(.eyebrow) { max-width: 650px; margin: 0 auto 26px; color: var(--muted); }

.site-footer {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 26px;
  align-items: center;
  padding: 32px max(24px, calc((100vw - var(--content)) / 2));
  border-top: 1px solid var(--line);
  background: #fff;
}
.footer-brand { display: flex; align-items: center; gap: 11px; }
.footer-brand img { border-radius: 9px; }
.footer-brand div { display: flex; flex-direction: column; line-height: 1.35; }
.footer-brand span { color: var(--muted); font-size: 12px; }
.footer-links { display: flex; flex-wrap: wrap; gap: 18px; color: #52627a; font-size: 14px; }
.footer-links a:hover { color: var(--blue); }
.copyright { grid-column: 1 / -1; margin: 0; color: #8491a3; font-size: 12px; }

.document-main { background: var(--surface); }
.document-hero {
  padding: 84px max(24px, calc((100vw - 940px) / 2));
  color: #fff;
  background: #17356a;
}
.document-hero.privacy-hero { background: #123b35; }
.document-hero .eyebrow { color: #8ff1d3; }
.document-hero h1 { max-width: 780px; margin-bottom: 20px; font-size: clamp(42px, 5vw, 64px); }
.document-hero > p:not(.eyebrow) { max-width: 780px; color: #d5e0f3; font-size: 19px; }
.document-hero.privacy-hero > p:not(.eyebrow) { color: #cce8df; }
.document-hero .button { margin-top: 12px; }
.policy-meta { display: flex; flex-wrap: wrap; gap: 12px 28px; margin-top: 28px; color: #b7d9cf; font-size: 14px; }

.document-layout {
  display: grid;
  grid-template-columns: 220px minmax(0, 760px);
  gap: 56px;
  justify-content: center;
  padding: 64px 24px 100px;
}
.document-nav {
  position: sticky;
  top: 104px;
  align-self: start;
  display: flex;
  flex-direction: column;
  gap: 5px;
  padding: 20px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 7px;
}
.document-nav strong { margin-bottom: 8px; font-size: 14px; }
.document-nav a { padding: 6px 8px; color: var(--muted); font-size: 14px; border-radius: 5px; }
.document-nav a:hover { color: var(--blue); background: var(--blue-soft); }

.document-content { min-width: 0; }
.document-content > section {
  margin-bottom: 22px;
  padding: 34px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 7px;
}
.document-content h2 { margin-bottom: 18px; font-size: 30px; }
.document-content h3 { margin: 27px 0 8px; font-size: 20px; }
.document-content p, .document-content li { color: #52627a; }
.document-content ul { padding-left: 22px; }
.document-content .section-kicker { color: var(--blue); }

.contact-panel { display: flex; align-items: center; justify-content: space-between; gap: 30px; border-left: 5px solid var(--blue) !important; }
.contact-panel h2 { overflow-wrap: anywhere; }
.contact-panel p { margin-bottom: 0; }
.policy-contact { border-left-color: var(--green) !important; }

.faq-section details { border-top: 1px solid var(--line); }
.faq-section summary {
  position: relative;
  padding: 21px 38px 21px 0;
  font-weight: 750;
  cursor: pointer;
  list-style: none;
}
.faq-section summary::-webkit-details-marker { display: none; }
.faq-section summary::after {
  content: "+";
  position: absolute;
  right: 4px;
  top: 17px;
  color: var(--blue);
  font-size: 24px;
  font-weight: 500;
}
.faq-section details[open] summary::after { content: "−"; }
.faq-section details p { padding: 0 34px 20px 0; }
.inline-link a { color: var(--blue); font-weight: 750; }
.version-note { display: flex; justify-content: space-between; gap: 20px; color: var(--muted); font-size: 14px; }

.policy-content > section:not(.policy-summary):not(.contact-panel) { padding-top: 38px; }
.policy-summary { border-top: 5px solid var(--green) !important; }
.summary-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.summary-grid p { display: flex; flex-direction: column; min-height: 126px; margin: 0; padding: 18px; background: var(--surface); border-radius: 6px; }
.summary-grid strong { color: var(--ink); }
.summary-grid span { margin-top: 7px; color: var(--muted); font-size: 14px; }

@media (max-width: 980px) {
  .site-header { align-items: flex-start; gap: 16px; }
  .main-nav { overflow-x: auto; max-width: 58vw; }
  .main-nav a { white-space: nowrap; }
  .hero { grid-template-columns: 1fr; min-height: auto; }
  .hero h1 { font-size: 58px; }
  .hero-copy { padding-top: 70px; padding-bottom: 52px; }
  .hero-product { min-height: 580px; padding: 35px 8vw 0; }
  .hero-product img { width: min(670px, 88%); transform: translateY(18%) rotate(0.8deg); }
  .scenario-grid { grid-template-columns: 1fr; }
  .feature-row { grid-template-columns: 1fr; gap: 36px; }
  .feature-row-reverse .feature-copy { order: initial; }
  .trust-band { grid-template-columns: 1fr; gap: 30px; }
  .document-layout { grid-template-columns: 1fr; }
  .document-nav { position: static; flex-direction: row; flex-wrap: wrap; }
  .document-nav strong { width: 100%; }
}

@media (max-width: 640px) {
  body { font-size: 16px; }
  .site-header { position: static; flex-direction: column; padding: 13px 18px; }
  .brand small { display: none; }
  .main-nav { width: 100%; max-width: none; gap: 3px; }
  .main-nav a { padding: 7px 9px; font-size: 13px; }
  .hero-copy { padding: 54px 22px 44px; }
  .hero h1 { font-size: 44px; }
  .hero-lead { font-size: 17px; }
  .hero-actions { align-items: stretch; flex-direction: column; }
  .store-badge, .button { width: 100%; }
  .hero-facts { display: grid; gap: 9px; }
  .hero-product { min-height: 420px; padding: 24px 14px 0; }
  .hero-product img { width: 96%; border-width: 6px; border-bottom-width: 11px; border-radius: 15px 15px 8px 8px; }
  .section { padding: 70px 20px; }
  .section-heading h2, .trust-band h2, .support-cta h2 { font-size: 34px; }
  .scenario-grid article { padding: 23px; }
  .feature-row { padding: 48px 0; }
  .feature-copy h3 { font-size: 30px; }
  .trust-points p { grid-template-columns: 1fr; gap: 4px; }
  .site-footer { grid-template-columns: 1fr; padding: 28px 20px; }
  .copyright { grid-column: auto; }
  .document-hero { padding: 58px 20px; }
  .document-hero h1 { font-size: 40px; }
  .document-layout { padding: 28px 14px 70px; gap: 20px; }
  .document-nav { overflow-x: auto; flex-wrap: nowrap; padding: 12px; }
  .document-nav strong { display: none; }
  .document-nav a { white-space: nowrap; }
  .document-content > section { padding: 24px 20px; }
  .document-content h2 { font-size: 26px; }
  .contact-panel { align-items: stretch; flex-direction: column; }
  .summary-grid { grid-template-columns: 1fr; }
  .summary-grid p { min-height: 0; }
  .version-note { flex-direction: column; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .button { transition: none; }
}