:root {
  --primary: rgb(70,139,223);
  --primary-dark: #2467b5;
  --primary-soft: #eef6ff;
  --ink: #0d1b2f;
  --text: #43546a;
  --muted: #76869a;
  --line: #dbe8f7;
  --card: #ffffff;
  --bg: #f7fbff;
  --shadow: 0 18px 46px rgba(34, 93, 150, .10);
  --radius: 22px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
  color: var(--ink);
  background: linear-gradient(180deg, #f8fcff 0%, #ffffff 28%, #f6fbff 100%);
  line-height: 1.75;
  overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
.container { width: min(1120px, calc(100% - 36px)); margin: 0 auto; }
.narrow { width: min(860px, calc(100% - 36px)); margin: 0 auto; }
.site-header {
  position: sticky;
  top: 0;
  z-index: 30;
  background: rgba(255,255,255,.86);
  backdrop-filter: blur(18px);
  border-bottom: 1px solid rgba(219,232,247,.82);
}
.header-inner {
  width: min(1160px, calc(100% - 28px));
  margin: 0 auto;
  min-height: 70px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
}
.brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 800; letter-spacing: -.02em; }
.logo-img { width: 38px; height: 38px; border-radius: 12px; }
.brand-text { font-size: 18px; }
.menu-toggle {
  border: 1px solid var(--line);
  background: #fff;
  color: var(--ink);
  border-radius: 999px;
  padding: 8px 14px;
  font-weight: 700;
}
.site-nav {
  display: none;
  position: absolute;
  left: 14px;
  right: 14px;
  top: 72px;
  padding: 12px;
  background: rgba(255,255,255,.98);
  border: 1px solid var(--line);
  border-radius: 20px;
  box-shadow: var(--shadow);
}
.site-nav.is-open { display: grid; gap: 4px; }
.site-nav a {
  color: #53657b;
  font-size: 14px;
  font-weight: 700;
  padding: 10px 12px;
  border-radius: 12px;
}
.site-nav a:hover, .site-nav a.active { color: var(--primary-dark); background: var(--primary-soft); }
section { padding: 52px 0; }
.eyebrow, .badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--primary-dark);
  background: var(--primary-soft);
  border: 1px solid #d9ebff;
  border-radius: 999px;
  padding: 6px 12px;
  font-size: 13px;
  font-weight: 800;
}
.centered-hero {
  position: relative;
  padding: 78px 0 38px;
  overflow: hidden;
}
.centered-hero::before {
  content: "";
  position: absolute;
  inset: -120px -80px auto;
  height: 360px;
  background: radial-gradient(circle at 50% 35%, rgba(70,139,223,.20), transparent 58%);
  pointer-events: none;
}
.hero-content { position: relative; text-align: center; width: min(880px, calc(100% - 34px)); margin: 0 auto; }
h1 {
  margin: 16px 0 16px;
  font-size: clamp(34px, 8vw, 72px);
  line-height: 1.08;
  letter-spacing: -.06em;
}
.hero-content p, .lead {
  color: var(--text);
  font-size: clamp(16px, 2.2vw, 20px);
  max-width: 760px;
  margin: 0 auto 24px;
}
.download-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 13px 24px;
  border-radius: 999px;
  background: var(--primary);
  color: #fff;
  font-weight: 800;
  box-shadow: 0 14px 32px rgba(70,139,223,.24);
  transition: transform .2s ease, box-shadow .2s ease, background .2s ease;
}
.download-btn:hover { transform: translateY(-1px); background: var(--primary-dark); box-shadow: 0 18px 38px rgba(70,139,223,.30); }
.hero-tags, .tag-row { display: flex; justify-content: center; flex-wrap: wrap; gap: 10px; margin-top: 18px; }
.hero-tags span, .tag-row span {
  border: 1px solid var(--line);
  background: rgba(255,255,255,.72);
  border-radius: 999px;
  padding: 8px 13px;
  color: #53657b;
  font-size: 13px;
  font-weight: 700;
}
.section-head { margin-bottom: 26px; }
.section-head.center { text-align: center; }
.section-head h2 { margin: 10px 0 8px; font-size: clamp(26px, 4vw, 44px); line-height: 1.16; letter-spacing: -.04em; }
.section-head p { margin: 0; color: var(--text); max-width: 720px; }
.section-head.center p { margin-left: auto; margin-right: auto; }
.product-bento {
  width: min(1080px, calc(100% - 36px));
  margin: 8px auto 0;
  display: grid;
  gap: 16px;
}
.phone-card, .status-card, .bento-card, .category-card, .ability-card, .scenario-card, .principle-card, .doc-card, .faq-item {
  background: rgba(255,255,255,.92);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}
.phone-card {
  padding: 24px;
  display: grid;
  place-items: center;
  min-height: 360px;
  background: linear-gradient(160deg, #ffffff 0%, #eff7ff 100%);
}
.phone-card img { width: min(240px, 76%); filter: drop-shadow(0 24px 38px rgba(36, 103, 181, .18)); }
.status-card { padding: 18px; }
.status-card strong { display: block; font-size: 16px; margin-bottom: 4px; }
.status-card p { margin: 0; color: var(--text); font-size: 14px; }
.ability-grid { display: grid; gap: 16px; }
.ability-card { padding: 22px; }
.ability-card h3, .bento-card h3, .category-card h3, .scenario-card h3, .principle-card h3, .doc-card h3 { margin: 0 0 8px; line-height: 1.28; }
.ability-card p, .bento-card p, .category-card p, .scenario-card p, .principle-card p, .doc-card p { color: var(--text); margin: 0; }
.roadmap { position: relative; display: grid; gap: 16px; counter-reset: step; }
.roadmap-item {
  position: relative;
  padding: 20px;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: #fff;
  box-shadow: 0 12px 32px rgba(34,93,150,.07);
}
.roadmap-no {
  display: inline-grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: var(--primary);
  color: #fff;
  font-weight: 900;
  margin-bottom: 12px;
}
.roadmap-item h3 { margin: 0 0 6px; }
.roadmap-item p { margin: 0 0 10px; color: var(--text); }
.text-link { color: var(--primary-dark); font-weight: 800; }
.category-bento, .bento-grid, .scenario-grid, .doc-grid { display: grid; gap: 16px; }
.category-card, .bento-card, .scenario-card, .doc-card { padding: 22px; }
.category-card a, .scenario-card a, .doc-card a { color: var(--primary-dark); font-weight: 800; display: inline-block; margin-top: 12px; }
.bento-card.large { min-height: 230px; background: linear-gradient(160deg, #fff 0%, #eef6ff 100%); }
.bento-card.small { min-height: 150px; }
.security-layout { display: grid; gap: 18px; align-items: center; }
.security-copy { padding: 4px 0; }
.security-copy p { color: var(--text); }
.principle-stack { display: grid; gap: 12px; }
.principle-card { padding: 18px; }
.scenario-card { min-height: 160px; }
.faq-list { display: grid; gap: 12px; }
.faq-item { padding: 18px 20px; }
.faq-item summary { cursor: pointer; font-weight: 850; color: var(--ink); }
.faq-item p { color: var(--text); margin: 10px 0 0; }
.cta-section { padding: 56px 0 68px; }
.cta-box {
  text-align: center;
  border: 1px solid #d9ebff;
  border-radius: 30px;
  padding: 36px 22px;
  background: linear-gradient(135deg, #eef6ff 0%, #ffffff 68%);
  box-shadow: var(--shadow);
}
.cta-box h2 { margin: 0 0 10px; font-size: clamp(26px, 4vw, 40px); letter-spacing: -.04em; }
.cta-box p { color: var(--text); margin: 0 auto 22px; max-width: 680px; }
.page-hero { padding: 58px 0 24px; }
.page-hero h1 { font-size: clamp(32px, 6vw, 54px); margin-bottom: 12px; }
.page-hero p { color: var(--text); max-width: 780px; font-size: 18px; }
.doc-layout { display: grid; gap: 20px; align-items: start; padding: 28px 0 62px; }
.article-body {
  background: rgba(255,255,255,.94);
  border: 1px solid var(--line);
  border-radius: 28px;
  padding: 24px;
  box-shadow: var(--shadow);
}
.article-body h2 { margin-top: 12px; font-size: 24px; letter-spacing: -.02em; }
.article-body p { color: var(--text); }
.article-body ul, .article-body ol { color: var(--text); padding-left: 22px; }
.article-body li + li { margin-top: 8px; }
.side-panel { display: grid; gap: 14px; }
.note-card {
  border: 1px solid #d9ebff;
  border-radius: 22px;
  background: linear-gradient(150deg, #f1f8ff, #fff);
  padding: 18px;
}
.note-card h3 { margin: 0 0 8px; }
.note-card p, .note-card li { color: var(--text); }
.step-list { display: grid; gap: 12px; margin: 18px 0; }
.step-card {
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 16px;
  background: #fbfdff;
}
.step-card strong { color: var(--primary-dark); }
.download-single { margin-top: 22px; }
.download-panel {
  border: 1px solid var(--line);
  border-radius: 28px;
  background: #fff;
  padding: 26px;
  box-shadow: var(--shadow);
}
.download-steps { display: grid; gap: 14px; margin: 24px 0; }
.download-step { padding: 18px; border-radius: 18px; background: var(--primary-soft); border: 1px solid #d9ebff; }
.site-footer { background: #eff6fd; border-top: 1px solid var(--line); padding-top: 42px; }
.footer-grid { display: grid; gap: 24px; }
.footer-brand { font-size: 20px; font-weight: 900; margin-bottom: 8px; }
.site-footer p { color: var(--text); margin: 0; }
.site-footer h3 { margin: 0 0 10px; font-size: 16px; }
.site-footer a { display: block; color: #53657b; padding: 4px 0; font-weight: 700; }
.footer-bottom { text-align: center; padding: 22px; color: var(--muted); font-size: 13px; }
@media (min-width: 700px) {
  section { padding: 70px 0; }
  .ability-grid, .scenario-grid, .doc-grid { grid-template-columns: repeat(2, 1fr); }
  .category-bento { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1.4fr 1fr 1fr; }
  .article-body { padding: 34px; }
}
@media (min-width: 960px) {
  .menu-toggle { display: none; }
  .site-nav {
    position: static;
    display: flex;
    align-items: center;
    gap: 4px;
    padding: 0;
    border: 0;
    border-radius: 0;
    box-shadow: none;
    background: transparent;
  }
  .centered-hero { padding-top: 108px; }
  .product-bento { grid-template-columns: 1.35fr .75fr .75fr; grid-auto-rows: minmax(154px, auto); }
  .phone-card { grid-row: span 2; min-height: 520px; }
  .phone-card img { width: 300px; }
  .ability-grid { grid-template-columns: repeat(4, 1fr); }
  .roadmap { grid-template-columns: repeat(6, 1fr); align-items: stretch; }
  .roadmap-item:nth-child(even) { margin-top: 28px; }
  .category-bento { grid-template-columns: repeat(4, 1fr); }
  .category-card.big { grid-column: span 2; min-height: 210px; }
  .bento-grid { grid-template-columns: repeat(6, 1fr); }
  .bento-card.large { grid-column: span 3; }
  .bento-card.medium { grid-column: span 2; }
  .bento-card.small { grid-column: span 1; }
  .security-layout { grid-template-columns: 1fr .9fr; gap: 42px; }
  .scenario-grid { grid-template-columns: repeat(5, 1fr); }
  .scenario-card { grid-column: span 1; }
  .doc-layout { grid-template-columns: minmax(0, 1fr) 300px; }
  .download-panel { padding: 38px; }
}