:root {
  --bg: #07111f;
  --bg-deep: #030712;
  --surface: rgba(255, 255, 255, 0.075);
  --surface-strong: rgba(255, 255, 255, 0.12);
  --text: #f8fafc;
  --muted: #cbd5e1;
  --muted-2: #94a3b8;
  --line: rgba(255, 255, 255, 0.16);
  --accent: #38bdf8;
  --accent-2: #8b5cf6;
  --accent-3: #22c55e;
  --shadow: 0 24px 80px rgba(0, 0, 0, 0.34);
  --radius-xl: 30px;
  --radius-lg: 22px;
  --radius-md: 16px;
  --max-width: 1160px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--text);
  font-family: Inter, 'Hiragino Sans', 'Hiragino Kaku Gothic ProN', 'Noto Sans JP', Meiryo, sans-serif;
  line-height: 1.75;
  background:
    radial-gradient(circle at 12% 4%, rgba(56, 189, 248, 0.28), transparent 34rem),
    radial-gradient(circle at 88% 0%, rgba(139, 92, 246, 0.26), transparent 32rem),
    radial-gradient(circle at 50% 44%, rgba(34, 197, 94, 0.08), transparent 36rem),
    linear-gradient(180deg, var(--bg) 0%, #0f172a 54%, var(--bg-deep) 100%);
}
body::before {
  position: fixed;
  inset: 0;
  z-index: -1;
  content: '';
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.035) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.88), transparent 76%);
}
a { color: inherit; text-decoration: none; }
p, h1, h2, h3 { margin-top: 0; }

h1 {
  max-width: 760px;
  margin-bottom: 24px;
  font-size: clamp(44px, 6.1vw, 82px);
  line-height: 1.02;
  letter-spacing: -0.055em;
  word-break: keep-all;
}
h1 span { display: block; }
h1 em,
h2 em {
  font-style: normal;
  background: linear-gradient(135deg, #f8fafc 0%, #67e8f9 42%, #a78bfa 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  text-shadow: none;
}
h2 {
  max-width: 100%;
  margin-bottom: 18px;
  font-size: clamp(30px, 4.4vw, 52px);
  line-height: 1.12;
  letter-spacing: -0.045em;
  word-break: normal;
  overflow-wrap: anywhere;
  line-break: strict;
  text-wrap: balance;
}
h3 {
  margin-bottom: 10px;
  font-size: 21px;
  line-height: 1.35;
  letter-spacing: -0.02em;
}
.headline-lines span { display: block; }
.hero-title { position: relative; }
.hero-title::after {
  display: block;
  width: min(240px, 48%);
  height: 6px;
  margin-top: 18px;
  border-radius: 999px;
  content: '';
  background: linear-gradient(90deg, var(--accent), var(--accent-2), transparent);
}

.skip-link {
  position: absolute;
  left: 16px;
  top: 12px;
  z-index: 100;
  padding: 10px 14px;
  border-radius: 999px;
  color: #031525;
  background: var(--accent);
  transform: translateY(-140%);
}
.skip-link:focus { transform: translateY(0); }
.site-header {
  position: sticky;
  top: 0;
  z-index: 30;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  width: min(100% - 32px, var(--max-width));
  margin: 0 auto;
  padding: 18px 0;
  backdrop-filter: blur(20px);
}
.brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 900; letter-spacing: 0.01em; }
.brand-mark {
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  border-radius: 14px;
  color: #031525;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  box-shadow: 0 14px 36px rgba(56, 189, 248, 0.26);
}
.site-nav { display: flex; align-items: center; gap: 18px; color: var(--muted); font-size: 14px; font-weight: 700; }
.site-nav a:hover { color: var(--text); }
.nav-cta { padding: 8px 14px; border: 1px solid var(--line); border-radius: 999px; background: rgba(255, 255, 255, 0.08); }
.section-shell { width: min(100% - 32px, var(--max-width)); margin: 0 auto; }
.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(320px, 0.95fr);
  gap: 46px;
  align-items: center;
  min-height: calc(100vh - 76px);
  padding: 64px 0 84px;
}
.hero-copy, .hero-visual, .section-heading, .feature-list, .usecase-grid, .cards, .workflow, .faq-section, .contact > div { min-width: 0; }
.eyebrow {
  margin-bottom: 14px;
  color: var(--accent);
  font-size: 12px;
  font-weight: 900;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}
.hero-lead, .section-heading p, .feature-item p, .usecase-grid p, .workflow p, .faq-list p, .contact p, .insight-strip p { color: var(--muted); font-size: 17px; }
.hero-lead { max-width: 690px; margin-bottom: 30px; font-size: clamp(16px, 2vw, 19px); }
.hero-actions { display: flex; flex-wrap: wrap; gap: 14px; margin-bottom: 22px; }
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 50px;
  padding: 0 22px;
  border-radius: 999px;
  font-weight: 900;
  transition: transform 160ms ease, background 160ms ease, border-color 160ms ease;
}
.button:hover { transform: translateY(-2px); }
.button.primary { color: #031525; background: linear-gradient(135deg, var(--accent), #67e8f9); box-shadow: 0 18px 46px rgba(56, 189, 248, 0.26); }
.button.secondary { border: 1px solid var(--line); color: var(--text); background: rgba(255, 255, 255, 0.07); }
.keyword-chips { display: flex; flex-wrap: wrap; gap: 10px; margin: 0; padding: 0; list-style: none; }
.keyword-chips li {
  padding: 8px 12px;
  border: 1px solid rgba(56, 189, 248, 0.24);
  border-radius: 999px;
  color: #dbeafe;
  background: rgba(56, 189, 248, 0.09);
  font-size: 13px;
  font-weight: 800;
}
.hero-visual { position: relative; }
.hero-visual::before {
  position: absolute;
  inset: 8% 0;
  content: '';
  border-radius: 999px;
  background: linear-gradient(135deg, rgba(56, 189, 248, 0.26), rgba(139, 92, 246, 0.3));
  filter: blur(46px);
}
.comparison-card, .quality-panel, .card, .feature-item, .usecase-grid article, .table-wrap, .steps li, .faq-list details, .contact, .insight-strip {
  border: 1px solid var(--line);
  background: var(--surface);
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px);
}
.comparison-card { position: relative; display: grid; gap: 18px; padding: 20px; border-radius: var(--radius-xl); }
.screen { position: relative; overflow: hidden; min-height: 190px; padding: 18px; border: 1px solid var(--line); border-radius: 22px; background: #111827; }
.screen::before { position: absolute; inset: 52px 18px 62px; content: ''; border-radius: 999px 999px 26px 26px; }
.screen::after { position: absolute; right: 28px; bottom: 24px; width: 46%; height: 28px; content: ''; border-radius: 999px; }
.screen.before { filter: contrast(0.9) saturate(0.8); background: repeating-linear-gradient(90deg, rgba(255, 255, 255, 0.09) 0 1px, transparent 1px 6px), linear-gradient(135deg, #1f2937, #475569); }
.screen.after { background: radial-gradient(circle at 24% 24%, rgba(56, 189, 248, 0.34), transparent 130px), linear-gradient(135deg, #0f172a, #1d4ed8 54%, #0f766e); }
.screen.before::before { background: linear-gradient(135deg, #64748b, #cbd5e1); filter: blur(2px); }
.screen.before::after { background: linear-gradient(135deg, #334155, #94a3b8); filter: blur(1.6px); }
.screen.after::before { background: linear-gradient(135deg, #dbeafe, #f8fafc); }
.screen.after::after { background: linear-gradient(135deg, #38bdf8, #22c55e); }
.screen span, .screen strong, .screen p { position: relative; z-index: 1; }
.screen span { display: inline-flex; margin-bottom: 4px; color: var(--muted-2); font-size: 12px; font-weight: 900; letter-spacing: 0.14em; text-transform: uppercase; }
.screen strong { display: block; font-size: 24px; }
.screen p { margin: 58px 0 0; color: var(--muted); font-size: 14px; }
.compare-arrow { display: grid; place-items: center; width: 54px; height: 54px; margin: -6px auto; border-radius: 50%; color: #031525; background: linear-gradient(135deg, var(--accent), var(--accent-3)); font-size: 28px; font-weight: 900; }
.quality-panel { position: relative; width: min(92%, 440px); margin: 18px auto 0; padding: 22px; border-radius: var(--radius-lg); }
.panel-title { margin-bottom: 12px; color: var(--text); font-weight: 900; }
.quality-panel dl { display: grid; gap: 10px; margin: 0; }
.quality-panel div { display: grid; grid-template-columns: 88px 1fr; gap: 12px; }
.quality-panel dt { color: var(--muted-2); font-size: 13px; font-weight: 900; }
.quality-panel dd { margin: 0; color: var(--text); font-weight: 800; }
.insight-strip { padding: 18px 22px; border-radius: var(--radius-lg); }
.insight-strip p { margin: 0; }
.section-grid, .split-section, .comparison-section, .workflow, .faq-section, .contact { padding: 98px 0; }
.section-heading { max-width: 820px; margin-bottom: 34px; position: relative; }
.section-heading::before {
  display: block;
  width: 52px;
  height: 3px;
  margin-bottom: 18px;
  border-radius: 999px;
  content: '';
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
}
.cards { display: grid; gap: 18px; }
.four-columns { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.card { padding: 24px; border-radius: var(--radius-lg); }
.card p { margin: 0; color: var(--muted); }
.card-icon { display: inline-flex; margin-bottom: 20px; color: var(--accent); font-weight: 900; }
.split-section { display: grid; grid-template-columns: minmax(0, 0.92fr) minmax(340px, 0.88fr); gap: clamp(28px, 4.8vw, 64px); align-items: start; }
.split-section > * { min-width: 0; }
.sticky-heading { position: sticky; top: 96px; max-width: 100%; }
.sticky-heading h2 { max-width: 720px; font-size: clamp(30px, 3.35vw, 44px); line-height: 1.16; letter-spacing: -0.035em; overflow-wrap: anywhere; word-break: normal; }
.feature-list { display: grid; gap: 16px; }
.feature-item { padding: 24px; border-radius: var(--radius-lg); }
.feature-item p { margin: 0; }
.usecase-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 18px; }
.usecase-grid article { padding: 24px; border-radius: var(--radius-lg); }
.usecase-grid p { margin: 0; }
.table-wrap { overflow: auto; border-radius: var(--radius-lg); }
table { width: 100%; min-width: 780px; border-collapse: collapse; }
th, td { padding: 18px; border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; }
thead th { color: var(--text); background: rgba(56, 189, 248, 0.1); font-size: 13px; letter-spacing: 0.08em; text-transform: uppercase; }
tbody th { width: 23%; color: #e0f2fe; }
tbody td { color: var(--muted); }
tbody tr:last-child th, tbody tr:last-child td { border-bottom: 0; }
.steps { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 16px; margin: 0; padding: 0; list-style: none; }
.steps li { padding: 24px; border-radius: var(--radius-lg); }
.steps span { display: grid; place-items: center; width: 44px; height: 44px; margin-bottom: 20px; border-radius: 15px; color: #031525; background: linear-gradient(135deg, var(--accent), var(--accent-2)); font-weight: 900; }
.steps strong { display: block; margin-bottom: 8px; font-size: 18px; }
.steps p { margin: 0; }
.faq-list { display: grid; gap: 14px; }
.faq-list details { padding: 18px 20px; border-radius: var(--radius-lg); }
.faq-list summary { cursor: pointer; color: var(--text); font-weight: 900; list-style-position: outside; }
.faq-list p { margin: 14px 0 0; }
.contact { display: flex; align-items: center; justify-content: space-between; gap: 26px; padding: 38px; margin-bottom: 90px; border-radius: var(--radius-xl); }
.contact > div { max-width: 760px; }
.site-footer { width: min(100% - 32px, var(--max-width)); margin: 0 auto; padding: 28px 0 42px; border-top: 1px solid var(--line); color: var(--muted-2); font-size: 14px; }
.fade-in { opacity: 0; transform: translateY(18px); transition: opacity 520ms ease, transform 520ms ease; }
.fade-in.is-visible { opacity: 1; transform: translateY(0); }

@media (max-width: 1180px) and (min-width: 981px) {
  .split-section { grid-template-columns: minmax(0, 1fr) minmax(310px, 0.72fr); gap: 32px; }
  .sticky-heading h2 { max-width: 620px; font-size: clamp(30px, 3vw, 40px); }
}
@media (max-width: 980px) {
  .site-nav { display: none; }
  .hero, .split-section { grid-template-columns: 1fr; }
  .hero { min-height: auto; padding-top: 48px; }
  .sticky-heading { position: static; }
  .sticky-heading h2 { max-width: 100%; }
  .four-columns, .steps, .usecase-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .contact { align-items: flex-start; flex-direction: column; }
}
@media (max-width: 640px) {
  .brand-text { font-size: 14px; }
  h1 { font-size: clamp(38px, 11.8vw, 54px); line-height: 1.08; letter-spacing: -0.035em; }
  h2 { font-size: clamp(28px, 8.4vw, 40px); letter-spacing: -0.04em; }
  .hero { padding-bottom: 64px; }
  .four-columns, .steps, .usecase-grid { grid-template-columns: 1fr; }
  .quality-panel div { grid-template-columns: 1fr; gap: 2px; }
  .section-grid, .split-section, .comparison-section, .workflow, .faq-section, .contact { padding: 72px 0; }
  .contact { padding: 28px; }
}