:root {
  --ruri: #1e50a2;
  --ruri-dark: #173f85;
  --ruri-deep: #0f2a5c;
  --ruri-tint: #eef3fb;
  --ink: #1c2433;
  --muted: #5a6478;
  --line: #dde3ee;
  --bg: #ffffff;
  --bg-alt: #f6f8fc;
  --radius: 10px;
  --max: 1080px;
  --font-latin: "Helvetica Neue", Arial, "Segoe UI", Roboto, sans-serif;
}

html:lang(ja) { --font-cjk: "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Noto Sans JP", "Noto Sans CJK JP", Meiryo, sans-serif; }
html:lang(zh-Hant) { --font-cjk: "PingFang TC", "Noto Sans TC", "Noto Sans CJK TC", "Microsoft JhengHei", sans-serif; }
html:lang(en) { --font-cjk: sans-serif; }

*, *::before, *::after { box-sizing: border-box; }

html { scroll-behavior: smooth; scroll-padding-top: 72px; -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  font-family: var(--font-latin), var(--font-cjk);
  font-size: 16px;
  line-height: 1.8;
  color: var(--ink);
  background: var(--bg);
  font-feature-settings: "palt" 0;
}
html:lang(en) body { line-height: 1.65; }

img { max-width: 100%; height: auto; display: block; }
a { color: var(--ruri); text-underline-offset: 3px; }
a:hover { color: var(--ruri-deep); }
:focus-visible { outline: 3px solid var(--ruri); outline-offset: 2px; border-radius: 4px; }

.container { width: 100%; max-width: var(--max); margin: 0 auto; padding: 0 24px; }
@media (max-width: 600px) { .container { padding: 0 16px; } }

.skip {
  position: absolute; left: -9999px; top: 0;
  background: var(--ruri-deep); color: #fff; padding: 8px 16px; z-index: 100;
}
.skip:focus { left: 8px; top: 8px; color: #fff; }

/* ---------------------------------------------------------------- header */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: saturate(180%) blur(8px);
  -webkit-backdrop-filter: saturate(180%) blur(8px);
  border-bottom: 1px solid var(--line);
}
.site-header .container { display: flex; align-items: center; gap: 24px; height: 64px; }
.brand { display: flex; align-items: center; flex-shrink: 0; }
.brand img { height: 28px; width: auto; }

.nav { display: flex; gap: 24px; margin-left: auto; }
.nav a { color: var(--ink); text-decoration: none; font-size: 14px; letter-spacing: 0.02em; }
.nav a:hover { color: var(--ruri); }

.lang { display: flex; gap: 2px; font-size: 13px; border: 1px solid var(--line); border-radius: 999px; padding: 2px; }
.lang a, .lang span { padding: 2px 10px; border-radius: 999px; text-decoration: none; color: var(--muted); line-height: 1.8; }
.lang a:hover { color: var(--ruri); }
.lang [aria-current] { background: var(--ruri); color: #fff; }

@media (max-width: 820px) {
  .nav { display: none; }
  .lang { margin-left: auto; }
}
@media (max-width: 400px) {
  .brand img { height: 22px; }
  .lang a, .lang span { padding: 2px 7px; }
}

/* ---------------------------------------------------------------- hero */
.hero {
  position: relative; overflow: hidden;
  padding: 112px 0 104px;
  background:
    linear-gradient(135deg, rgba(30, 80, 162, 0.06) 0%, rgba(30, 80, 162, 0) 55%),
    var(--bg);
  border-bottom: 1px solid var(--line);
}
.hero::after {
  /* faint facet motif echoing the logo gem */
  content: ""; position: absolute; right: -120px; top: 50%;
  width: 520px; height: 520px; transform: translateY(-50%) rotate(45deg);
  background:
    linear-gradient(135deg, rgba(91, 134, 207, 0.12) 0 50%, rgba(15, 42, 92, 0.08) 50% 100%);
  border: 1px solid rgba(30, 80, 162, 0.10);
  pointer-events: none;
}
.hero .container { position: relative; z-index: 1; }
.eyebrow {
  display: inline-block; margin: 0 0 20px;
  font-size: 13px; font-weight: 600; letter-spacing: 0.12em; color: var(--ruri);
}
.hero h1 {
  margin: 0 0 24px; max-width: 22em; text-wrap: balance;
  font-size: clamp(28px, 4.6vw, 44px); line-height: 1.4; font-weight: 700;
  color: var(--ruri-deep); letter-spacing: 0.01em;
}
html:lang(en) .hero h1 { max-width: 20em; line-height: 1.25; letter-spacing: -0.01em; }
.hero .lead { margin: 0 0 36px; max-width: 38em; font-size: 17px; color: var(--muted); }
.actions { display: flex; flex-wrap: wrap; gap: 12px; }

.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 12px 24px; border-radius: 999px; font-size: 15px; font-weight: 600;
  text-decoration: none; border: 1px solid var(--ruri); transition: background .15s, color .15s;
}
.btn-primary { background: var(--ruri); color: #fff; }
.btn-primary:hover { background: var(--ruri-deep); border-color: var(--ruri-deep); color: #fff; }
.btn-ghost { background: transparent; color: var(--ruri); }
.btn-ghost:hover { background: var(--ruri-tint); }

@media (max-width: 600px) {
  .hero { padding: 72px 0 64px; }
  .hero::after { width: 320px; height: 320px; right: -160px; opacity: .7; }
}

/* ---------------------------------------------------------------- sections */
.section { padding: 96px 0; }
.section-alt { background: var(--bg-alt); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
@media (max-width: 600px) { .section { padding: 64px 0; } }

.section-head { margin-bottom: 48px; }
.section-head .label, .contact-box .label {
  display: block; margin-bottom: 8px;
  font-family: var(--font-latin); font-size: 12px; font-weight: 700; letter-spacing: 0.2em;
  color: var(--ruri); text-transform: uppercase;
}
.section-head h2 { margin: 0; font-size: clamp(24px, 3.2vw, 32px); line-height: 1.4; color: var(--ruri-deep); }
.section-head p { margin: 12px 0 0; color: var(--muted); max-width: 40em; }

/* cards */
.grid { display: grid; gap: 20px; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); }
.card {
  background: var(--bg); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 28px 24px;
}
.card .icon {
  width: 44px; height: 44px; border-radius: 10px; margin-bottom: 18px;
  display: grid; place-items: center; background: var(--ruri-tint); color: var(--ruri);
}
.card .icon svg { width: 24px; height: 24px; }
.card h3 { margin: 0 0 8px; font-size: 18px; line-height: 1.5; color: var(--ruri-deep); }
.card p { margin: 0; font-size: 15px; color: var(--muted); }

/* strengths */
.strengths { display: grid; gap: 0; grid-template-columns: repeat(2, 1fr); border-top: 1px solid var(--line); }
.strength { padding: 28px 32px 28px 0; border-bottom: 1px solid var(--line); display: flex; gap: 20px; }
.strength:nth-child(odd) { padding-right: 32px; }
.strength:nth-child(even) { padding-left: 32px; border-left: 1px solid var(--line); }
.strength .num {
  flex-shrink: 0; font-family: var(--font-latin); font-size: 13px; font-weight: 700;
  color: var(--ruri); letter-spacing: 0.08em; padding-top: 3px;
}
.strength h3 { margin: 0 0 6px; font-size: 17px; line-height: 1.5; color: var(--ruri-deep); }
.strength p { margin: 0; font-size: 15px; color: var(--muted); }
@media (max-width: 720px) {
  .strengths { grid-template-columns: 1fr; }
  .strength, .strength:nth-child(odd), .strength:nth-child(even) { padding: 24px 0; border-left: 0; }
}

/* product */
.product {
  display: grid; grid-template-columns: 1.1fr 1fr; gap: 48px; align-items: start;
  background: var(--bg); border: 1px solid var(--line); border-radius: 14px; padding: 48px;
}
.product .tag {
  display: inline-block; font-size: 12px; font-weight: 600; letter-spacing: 0.06em;
  color: var(--ruri); background: var(--ruri-tint); border-radius: 999px; padding: 2px 12px; margin-bottom: 14px;
}
.product h3 { margin: 0 0 16px; font-size: 26px; line-height: 1.35; color: var(--ruri-deep); font-family: var(--font-latin); }
.product p { margin: 0 0 16px; color: var(--muted); }
.product .proof {
  margin: 24px 0 28px; padding: 16px 20px; border-left: 3px solid var(--ruri);
  background: var(--ruri-tint); border-radius: 0 8px 8px 0; color: var(--ink); font-size: 15px;
}
.features { list-style: none; margin: 0; padding: 0; display: grid; gap: 16px; }
.features li { display: flex; gap: 14px; padding: 18px 20px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--bg-alt); }
.features svg { flex-shrink: 0; width: 22px; height: 22px; color: var(--ruri); margin-top: 3px; }
.features strong { display: block; color: var(--ruri-deep); font-size: 15px; margin-bottom: 2px; }
.features span { font-size: 14px; color: var(--muted); line-height: 1.7; }
@media (max-width: 860px) {
  .product { grid-template-columns: 1fr; padding: 32px 24px; gap: 32px; }
}

/* company table */
.company { width: 100%; border-collapse: collapse; border-top: 1px solid var(--line); }
.company th, .company td { text-align: left; vertical-align: top; padding: 20px 0; border-bottom: 1px solid var(--line); font-size: 15px; }
.company th { width: 200px; font-weight: 600; color: var(--ruri-deep); padding-right: 24px; }
.company td small { color: var(--muted); }
.placeholder { color: var(--muted); }
@media (max-width: 600px) {
  .company th, .company td { display: block; width: auto; }
  .company th { padding: 18px 0 2px; border-bottom: 0; }
  .company td { padding: 0 0 18px; }
}

/* contact */
.contact-box {
  display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 24px;
  background: var(--ruri-deep); color: #fff; border-radius: 14px; padding: 48px;
}
.contact-box h2 { margin: 0 0 8px; font-size: clamp(22px, 3vw, 28px); color: #fff; }
.contact-box p { margin: 0; color: rgba(255, 255, 255, 0.78); max-width: 32em; }
.contact-box .label { color: #9fbbe8; }
.email {
  background: #fff; border-radius: 999px; padding: 14px 28px;
  display: inline-flex; align-items: center; gap: 12px;
}
.email svg { width: 22px; height: 22px; color: var(--ruri); flex-shrink: 0; }
.email img { height: 22px; width: auto; }
@media (max-width: 600px) {
  .contact-box { padding: 32px 20px; }
  .email { padding: 12px 20px; }
  .email img { height: 18px; }
}

/* ---------------------------------------------------------------- footer */
.site-footer { padding: 40px 0; font-size: 13px; color: var(--muted); }
.site-footer .container { display: flex; flex-wrap: wrap; gap: 16px; align-items: center; justify-content: space-between; }
.site-footer img { height: 20px; width: auto; }
.site-footer a { color: var(--muted); }
.notfound { margin-top: 48px; }
.nowrap { display: inline-block; }