:root {
  color-scheme: dark;
  --bg: #08090d;
  --bg-soft: #0d0f15;
  --surface: #12141b;
  --surface-2: #181b24;
  --ink: #f7f7fb;
  --muted: #a1a5b2;
  --muted-2: #747987;
  --line: rgba(255, 255, 255, .09);
  --accent: #7667f7;
  --accent-bright: #a58bff;
  --accent-soft: rgba(118, 103, 247, .14);
  --green: #55d6a0;
  --shadow: 0 30px 100px rgba(0, 0, 0, .4);
  --shell: 1160px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at 50% -10%, rgba(118, 103, 247, .18), transparent 32rem),
    var(--bg);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", "PingFang SC", "Noto Sans CJK SC", sans-serif;
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

img { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
a:hover { color: #fff; }
button, input, textarea { font: inherit; }

.skip-link {
  position: fixed;
  left: 14px;
  top: -80px;
  z-index: 100;
  padding: 10px 14px;
  border-radius: 10px;
  background: #fff;
  color: #000;
}
.skip-link:focus { top: 14px; }

.site-shell {
  width: min(var(--shell), calc(100% - 40px));
  margin-inline: auto;
}

.site-header {
  min-height: 76px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  font-weight: 760;
  letter-spacing: -.3px;
}
.brand img { width: 38px; height: 38px; border-radius: 9px; }
.header-actions, .site-nav { display: flex; align-items: center; }
.header-actions { gap: 18px; }
.site-nav { gap: 26px; }
.site-nav a, .language-link {
  color: var(--muted);
  font-size: 14px;
  font-weight: 640;
}
.site-nav a:hover, .site-nav a[aria-current="page"], .language-link:hover { color: var(--ink); }
.language-link {
  padding: 7px 11px;
  border: 1px solid var(--line);
  border-radius: 10px;
}

.button {
  min-height: 50px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0 22px;
  border: 1px solid transparent;
  border-radius: 14px;
  font-weight: 720;
  letter-spacing: -.2px;
  transition: transform .18s ease, background .18s ease, border-color .18s ease;
}
.button:hover { transform: translateY(-1px); }
.button-primary {
  background: linear-gradient(135deg, #8577ff, #6859e8);
  color: #fff;
  box-shadow: 0 16px 42px rgba(118, 103, 247, .28);
}
.button-primary:hover { background: linear-gradient(135deg, #9488ff, #7465ef); }
.button-secondary { border-color: var(--line); background: rgba(255, 255, 255, .035); }
.button-small { min-height: 40px; padding-inline: 16px; border-radius: 11px; font-size: 14px; }

.hero {
  min-height: 720px;
  display: grid;
  grid-template-columns: .9fr 1.1fr;
  align-items: center;
  gap: 52px;
  padding: 64px 0 80px;
}
.hero-copy { position: relative; z-index: 2; }
.eyebrow {
  margin: 0 0 16px;
  color: var(--accent-bright);
  font-size: 13px;
  font-weight: 780;
  letter-spacing: .13em;
  text-transform: uppercase;
}
.hero h1 {
  margin: 0;
  max-width: 680px;
  font-size: clamp(50px, 6.5vw, 84px);
  line-height: .98;
  letter-spacing: -.058em;
  text-wrap: balance;
}
.hero-lead {
  max-width: 610px;
  margin: 26px 0 0;
  color: #c2c5cf;
  font-size: clamp(18px, 2vw, 21px);
  line-height: 1.55;
}
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 32px; }
.platform-note { margin: 16px 0 0; color: var(--muted-2); font-size: 14px; }

.hero-visual {
  position: relative;
  min-height: 600px;
  display: flex;
  align-items: center;
  justify-content: center;
  max-width: 620px;
  margin-inline: auto;
  isolation: isolate;
}
.hero-visual::before {
  content: "";
  position: absolute;
  width: 560px;
  height: 560px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(118, 103, 247, .28), rgba(118, 103, 247, .04) 55%, transparent 72%);
  filter: blur(4px);
  z-index: -1;
}
.phone {
  flex: 0 0 auto;
  width: auto;
  height: 540px;
  aspect-ratio: 603 / 1311;
  padding: 6px;
  border-radius: 38px;
  background: linear-gradient(145deg, #666975, #21232b 38%, #555864 75%, #181920);
  box-shadow: var(--shadow), 0 0 0 1px rgba(255, 255, 255, .08);
}
.phone img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  border-radius: 32px;
  background: #050609;
}
.phone-main { transform: translateY(-8px); }
.phone-secondary {
  width: auto;
  height: 470px;
  margin-left: -42px;
  transform: translateY(30px);
  z-index: -1;
  opacity: .9;
}

.answer-strip {
  padding: 42px;
  border: 1px solid var(--line);
  border-radius: 28px;
  background: linear-gradient(135deg, rgba(118, 103, 247, .12), rgba(255, 255, 255, .025));
}
.answer-strip h2, .section-heading h2, .privacy-panel h2, .download-panel h2 {
  margin: 0;
  font-size: clamp(30px, 4.5vw, 48px);
  line-height: 1.1;
  letter-spacing: -.04em;
}
.answer-strip > p:last-of-type { max-width: 850px; color: #c2c5cf; font-size: 18px; }
.fact-list { display: flex; flex-wrap: wrap; gap: 10px; margin: 26px 0 0; padding: 0; list-style: none; }
.fact-list li { padding: 8px 13px; border-radius: 999px; background: rgba(255, 255, 255, .06); color: #d8dae2; font-size: 14px; }

.section { padding: 112px 0; }
.section-soft { border-block: 1px solid var(--line); background: var(--bg-soft); }
.section-heading { max-width: 770px; margin-bottom: 44px; }
.section-heading.centered { margin-inline: auto; text-align: center; }
.section-heading > p:last-child { color: var(--muted); font-size: 18px; }
.split-heading { max-width: none; display: flex; align-items: end; justify-content: space-between; gap: 24px; }
.split-heading > div { max-width: 760px; }

.workflow-grid, .feature-grid, .use-case-grid, .guide-grid, .support-grid {
  display: grid;
  gap: 18px;
}
.workflow-grid { grid-template-columns: repeat(3, 1fr); }
.feature-grid { grid-template-columns: repeat(3, 1fr); }
.use-case-grid { grid-template-columns: repeat(3, 1fr); }
.guide-grid { grid-template-columns: repeat(3, 1fr); }
.support-grid { grid-template-columns: repeat(2, 1fr); }

.workflow-card, .feature-card, .use-case-card, .guide-card, .support-card {
  border: 1px solid var(--line);
  border-radius: 22px;
  background: var(--surface);
}
.workflow-card, .feature-card, .use-case-card, .support-card { padding: 28px; }
.workflow-number, .feature-icon, .use-case-icon {
  width: 42px;
  height: 42px;
  display: grid;
  place-items: center;
  margin-bottom: 24px;
  border-radius: 13px;
  background: var(--accent-soft);
  color: var(--accent-bright);
  font-weight: 800;
}
.workflow-card h3, .feature-card h3, .use-case-card h3, .guide-card h2, .guide-card h3, .support-card h2, .support-card h3 { margin: 0 0 9px; line-height: 1.25; letter-spacing: -.02em; }
.workflow-card p, .feature-card p, .use-case-card p, .guide-card p, .support-card p { margin: 0; color: var(--muted); }

.screen-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; align-items: start; }
.screen-figure { margin: 0; }
.screen-frame {
  width: min(100%, 320px);
  margin-inline: auto;
  padding: 8px;
  aspect-ratio: 603 / 1311;
  border-radius: 36px;
  background: linear-gradient(145deg, #575a65, #171920 45%, #454852);
  box-shadow: 0 22px 70px rgba(0, 0, 0, .32);
}
.screen-frame img { width: 100%; height: 100%; object-fit: contain; border-radius: 29px; }
.screen-figure figcaption { margin-top: 15px; color: var(--muted); text-align: center; font-size: 14px; }

.guide-card { display: block; padding: 28px; transition: transform .18s ease, border-color .18s ease; }
.guide-card:hover { transform: translateY(-3px); border-color: rgba(165, 139, 255, .45); }
.guide-card .eyebrow { margin-bottom: 12px; }
.text-link { color: var(--accent-bright); font-weight: 700; }
.guide-card .text-link { display: inline-block; margin-top: 20px; }

.privacy-panel, .download-panel {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 24px;
  padding: 34px;
  border: 1px solid rgba(85, 214, 160, .22);
  border-radius: 24px;
  background: rgba(85, 214, 160, .06);
}
.privacy-mark { width: 48px; height: 48px; display: grid; place-items: center; border-radius: 15px; color: var(--green); background: rgba(85, 214, 160, .12); font-weight: 850; }
.privacy-panel h2, .download-panel h2 { font-size: 30px; }
.privacy-panel p, .download-panel p { margin: 7px 0 0; color: var(--muted); }
.download-panel { margin-bottom: 108px; border-color: rgba(118, 103, 247, .25); background: linear-gradient(135deg, rgba(118, 103, 247, .13), rgba(255, 255, 255, .025)); }
.download-panel img { width: 68px; border-radius: 16px; }

.faq-list { max-width: 880px; margin-inline: auto; }
.faq-list details { border-top: 1px solid var(--line); }
.faq-list details:last-child { border-bottom: 1px solid var(--line); }
.faq-list summary { cursor: pointer; list-style: none; padding: 23px 34px 23px 0; font-weight: 720; position: relative; }
.faq-list summary::-webkit-details-marker { display: none; }
.faq-list summary::after { content: "+"; position: absolute; right: 4px; color: var(--accent-bright); font-size: 22px; font-weight: 500; }
.faq-list details[open] summary::after { content: "−"; }
.faq-list details p { max-width: 780px; margin: -4px 0 24px; color: var(--muted); }

.page-hero { max-width: 820px; padding: 92px 0 62px; }
.page-hero h1, .article-header h1 { margin: 0; font-size: clamp(42px, 6vw, 68px); line-height: 1.03; letter-spacing: -.05em; }
.page-hero > p:last-child, .article-deck { color: #bdc0cb; font-size: 19px; }
.breadcrumbs { margin-bottom: 18px; color: var(--muted-2); font-size: 14px; }
.breadcrumbs a:hover { color: var(--ink); }

.legal, .article-body { max-width: 820px; padding-bottom: 110px; }
.legal h2, .article-body h2 { margin: 48px 0 12px; font-size: 28px; line-height: 1.2; letter-spacing: -.025em; }
.legal h3, .article-body h3 { margin: 34px 0 8px; font-size: 21px; }
.legal p, .legal li, .article-body p, .article-body li { color: #b9bdc8; }
.legal a, .article-body a { color: var(--accent-bright); text-decoration: underline; text-underline-offset: 3px; }
.legal .updated, .article-meta { color: var(--muted-2); font-size: 14px; }
.legal ul, .article-body ul, .article-body ol { padding-left: 22px; }
.answer-box, .tip-box {
  margin: 30px 0;
  padding: 22px 24px;
  border: 1px solid rgba(118, 103, 247, .25);
  border-radius: 18px;
  background: var(--accent-soft);
}
.answer-box strong, .tip-box strong { display: block; margin-bottom: 5px; color: var(--ink); }
.answer-box p, .tip-box p { margin: 0; color: #c9cbd4; }
.article-header { max-width: 900px; padding: 86px 0 38px; }
.article-deck { max-width: 760px; }
.article-meta { display: flex; flex-wrap: wrap; gap: 16px; margin-top: 20px; }
.article-body table { width: 100%; border-collapse: collapse; margin: 26px 0; }
.article-body th, .article-body td { padding: 13px 14px; border: 1px solid var(--line); text-align: left; vertical-align: top; }
.article-body th { background: var(--surface-2); }
.article-body td { color: #b9bdc8; }

.site-footer {
  min-height: 90px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  border-top: 1px solid var(--line);
  color: var(--muted-2);
  font-size: 14px;
}
.site-footer nav { display: flex; flex-wrap: wrap; gap: 22px; }
.site-footer a:hover { color: var(--ink); }

@media (max-width: 900px) {
  .site-header { align-items: flex-start; padding-block: 16px; }
  .header-actions { align-items: flex-end; flex-direction: column-reverse; gap: 10px; }
  .site-nav { flex-wrap: wrap; justify-content: flex-end; gap: 10px 18px; }
  .hero { grid-template-columns: 1fr; padding-top: 58px; text-align: center; }
  .hero-copy, .hero-lead { margin-inline: auto; }
  .hero-actions { justify-content: center; }
  .hero-visual { min-height: 430px; }
  .phone { height: 410px; }
  .phone-secondary { display: none; }
  .workflow-grid, .feature-grid, .use-case-grid, .guide-grid { grid-template-columns: repeat(2, 1fr); }
  .screen-grid { gap: 14px; }
  .privacy-panel, .download-panel { grid-template-columns: auto 1fr; }
  .privacy-panel > a, .download-panel > a, .download-panel > .button { grid-column: 2; justify-self: start; }
}

@media (max-width: 620px) {
  .site-shell { width: min(var(--shell), calc(100% - 28px)); }
  .site-header { min-height: 68px; align-items: center; }
  .brand strong { display: none; }
  .site-nav a:nth-child(1), .site-nav a:nth-child(2) { display: none; }
  .hero { min-height: auto; padding: 50px 0 64px; gap: 28px; }
  .hero h1 { font-size: 50px; }
  .hero-visual { min-height: 350px; margin: 0; }
  .hero-visual::before { width: min(350px, 100%); height: 350px; }
  .phone { width: auto; height: 330px; }
  .answer-strip { padding: 28px 22px; }
  .section { padding: 78px 0; }
  .workflow-grid, .feature-grid, .use-case-grid, .guide-grid, .support-grid { grid-template-columns: 1fr; }
  .screen-grid { grid-template-columns: 1fr; max-width: 320px; margin-inline: auto; gap: 42px; }
  .split-heading { align-items: flex-start; flex-direction: column; }
  .privacy-panel, .download-panel { grid-template-columns: 1fr; }
  .privacy-panel > a, .download-panel > a, .download-panel > .button { grid-column: 1; }
  .page-hero, .article-header { padding-top: 62px; }
  .article-body table { font-size: 14px; }
  .site-footer { align-items: flex-start; flex-direction: column; padding-block: 28px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; }
}