/* ===================================================================
   Ai Koyama Website — styles
   Ported from design-reference/.../Ai Koyama Website V3.7.dc.html
   Desktop baseline ~1440px canvas, mobile baseline 390px canvas.
   Breakpoint: 860px (mobile layout below, desktop layout at/above).
   =================================================================== */

:root {
  --blue: #2250d9;
  --navy: #0f1b2d;
  --text: #0f1b2d;
  --muted: #566174;
  --muted-2: #3a4558;
  --muted-3: #667286;
  --border: #dde2ea;
  --border-2: #cfd6e2;
  --bg: #f7f8fa;
  --gray-light: #e0e5ed;
  --gray-2: #c9d1de;
  --gray-3: #8b98ae;
  --gray-4: #b8c2d3;
  --font: 'IBM Plex Sans JP', 'Hiragino Sans', 'Yu Gothic', sans-serif;
  --page-max: 1440px;
  --pad-x: clamp(20px, 6.6vw, 96px);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.9;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; }

ul, ol { margin: 0; padding: 0; list-style: none; }

h1, h2, h3, p { margin: 0; }

button { font-family: inherit; cursor: pointer; }

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--blue);
  color: #fff;
  padding: 10px 16px;
  z-index: 100;
}
.skip-link:focus {
  left: 12px;
  top: 12px;
}

a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--blue);
  outline-offset: 2px;
}

.hide-mobile { display: inline; }
.show-mobile { display: none; }

.br-mobile { display: none; }
.br-desktop { display: inline; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-block;
  font-weight: 600;
  text-decoration: none;
  border-radius: 4px;
  transition: opacity 0.2s ease;
}
.btn:hover { opacity: 0.88; }
.btn--primary {
  background: var(--blue);
  color: #fff;
  font-size: 16px;
  padding: 15px 28px;
}
.link-underline {
  font-size: 15px;
  font-weight: 500;
  color: var(--text);
  text-decoration: none;
  border-bottom: 1px solid var(--gray-3);
  padding-bottom: 2px;
}

/* ---------- Header / Nav ---------- */
.site-header {
  border-bottom: 1px solid var(--border);
  position: relative;
  background: var(--bg);
}
.site-header__inner {
  max-width: var(--page-max);
  margin: 0 auto;
  height: 76px;
  padding: 0 var(--pad-x);
  display: flex;
  align-items: center;
  gap: 40px;
}
.brand {
  margin-right: auto;
  display: flex;
  align-items: baseline;
  gap: 12px;
  text-decoration: none;
  color: var(--text);
}
.brand__name { font-size: 19px; font-weight: 600; }
.brand__kana { font-size: 13px; color: var(--muted); }
.nav { display: flex; gap: 40px; }
.nav a { font-size: 14px; color: var(--muted-2); text-decoration: none; }
.nav-cta { font-size: 14px; padding: 10px 20px; }
.nav-toggle {
  display: none;
  border: none;
  background: none;
  font-size: 22px;
  padding: 4px 8px;
  color: var(--text);
}
.mobile-nav { display: none; }

@media (max-width: 860px) {
  .site-header__inner { height: 60px; padding: 0 20px; gap: 0; }
  .nav, .nav-cta { display: none; }
  .nav-toggle { display: inline-flex; }
  .brand { gap: 0; flex-direction: column; align-items: flex-start; }
  .brand__kana { display: none; }
  .mobile-nav[hidden] { display: none; }
  .mobile-nav {
    display: flex;
    flex-direction: column;
    gap: 2px;
    padding: 8px 20px 20px;
    border-top: 1px solid var(--border);
    background: var(--bg);
  }
  .mobile-nav a {
    padding: 12px 0;
    font-size: 15px;
    color: var(--muted-2);
    text-decoration: none;
    border-bottom: 1px solid var(--border);
  }
  .mobile-nav .btn { margin-top: 14px; text-align: center; }
}

/* ---------- Layout helpers ---------- */
.section__inner {
  max-width: var(--page-max);
  margin: 0 auto;
  padding: 168px var(--pad-x) 0;
}
@media (max-width: 860px) {
  .section__inner { padding: 80px 20px 0; }
}

/* ---------- Hero ---------- */
.hero__inner {
  max-width: var(--page-max);
  margin: 0 auto;
  padding: 112px var(--pad-x) 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 560px;
  gap: 72px;
  align-items: start;
}
.hero__title {
  font-size: 46px;
  line-height: 1.5;
  letter-spacing: -0.02em;
  font-weight: 700;
  margin: 0 0 30px;
}
.hero__subtitle {
  font-size: 16px;
  font-weight: 600;
  color: var(--blue);
  line-height: 1.7;
  margin: 0 0 18px;
}
.hero__lead {
  font-size: 17px;
  line-height: 2;
  max-width: 540px;
  margin: 0 0 38px;
  color: var(--muted-2);
}
.hero__ctas { display: flex; align-items: center; gap: 28px; margin-bottom: 12px; }
.hero__note { font-size: 13px; color: var(--muted); margin: 0; }
.stat__plus { color: var(--blue); }

.hero__visual { margin-top: 8px; }
.hero__visual picture { display: block; }
.hero__visual img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1672 / 941;
  object-fit: contain;
  border-radius: 8px;
  box-shadow: 0 24px 50px -32px rgba(15, 27, 45, 0.35);
}

@media (max-width: 860px) {
  .hero__inner { grid-template-columns: 1fr; padding: 40px 20px 0; gap: 0; }
  .hero__title { font-size: 29px; margin: 0 0 16px; }
  .hero__subtitle { font-size: 13.5px; margin: 0 0 14px; }
  .hero__lead { font-size: 14.5px; line-height: 1.95; margin: 0 0 22px; }
  .hero__ctas { display: block; margin-bottom: 0; }
  .hero__ctas .btn { display: block; text-align: center; padding: 15px 20px; }
  .hero__note { text-align: center; margin: 10px 0 0; }
  .hero__visual { margin-top: 20px; }

  .hide-mobile { display: none !important; }
  .show-mobile { display: inline; }
  .br-mobile { display: block; }
  .br-desktop { display: none; }
}

/* ---------- Scroll fade-in ---------- */
[data-fx] {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}
[data-fx].in { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  [data-fx] { opacity: 1; transform: none; transition: none; }
}

/* ---------- Pains ---------- */
.pains {
  display: grid;
  grid-template-columns: minmax(0, 4fr) minmax(0, 8fr);
  gap: 64px;
  align-items: start;
}
.pains__title { font-size: 34px; line-height: 1.6; font-weight: 700; letter-spacing: -0.015em; }

.pains__grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; }
.pain-card {
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding: 20px 22px 22px;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 6px;
  transition: border-color 0.2s;
}
.pain-card:hover { border-color: #b9c8f0; }
.pain-card p { font-size: 16.5px; font-weight: 500; line-height: 1.7; margin: 0; }
.icon-chip {
  flex: none;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 46px;
  height: 46px;
  border-radius: 8px;
  background: #eef3ff;
  color: var(--blue);
}
.icon-chip svg { width: 26px; height: 26px; }

@media (max-width: 860px) {
  .pains { grid-template-columns: 1fr; gap: 0; }
  .pains__title { font-size: 24px; margin: 0 0 16px; }
  .pains__grid { grid-template-columns: 1fr; gap: 10px; }
  .pain-card { padding: 16px 18px 18px; }
  .pain-card p { font-size: 15px; line-height: 1.7; }
}

/* ---------- Services ---------- */
.services { display: grid; grid-template-columns: minmax(0, 4fr) minmax(0, 8fr); gap: 64px; }
.services__head h2 { font-size: 34px; line-height: 1.6; margin: 0 0 14px; font-weight: 700; letter-spacing: -0.015em; }
.services__head p { font-size: 15px; color: var(--muted); max-width: 300px; }
.services__grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; }
.service-card {
  padding: 22px 24px 26px;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 6px;
  transition: box-shadow 0.2s, transform 0.2s;
}
.service-card:hover { box-shadow: 0 14px 30px -20px rgba(15, 27, 45, 0.35); transform: translateY(-2px); }
.service-card .icon-chip { margin-bottom: 14px; }
.service-card__title { font-size: 19px; font-weight: 700; line-height: 1.55; margin-bottom: 6px; }
.service-card p { font-size: 14.5px; line-height: 1.95; color: var(--muted-2); margin: 0; }
.services__footnote { font-size: 15.5px; line-height: 2; max-width: 720px; margin: 28px 0 0; color: var(--muted-2); }

@media (max-width: 860px) {
  .services { grid-template-columns: 1fr; gap: 0; }
  .services__head h2 { font-size: 24px; margin: 0 0 16px; }
  .services__head p { max-width: none; }
  .services__grid { margin-top: 16px; grid-template-columns: 1fr; gap: 10px; }
  .service-card { padding: 18px 18px 20px; }
  .service-card__title { font-size: 17px; }
  .service-card p { font-size: 13.5px; line-height: 1.9; }
  .services__footnote { font-size: 14px; line-height: 1.95; margin: 20px 0 0; }
}

/* ---------- Data x AI ---------- */
.data-ai__head { margin-bottom: 52px; max-width: 640px; }
.data-ai__eyebrow { font-size: 13px; font-weight: 600; color: var(--blue); letter-spacing: 0.08em; margin-bottom: 8px; }
.data-ai__head h2 { font-size: 34px; line-height: 1.6; margin: 0 0 6px; font-weight: 700; letter-spacing: -0.015em; }
.data-ai__head p { font-size: 15px; color: var(--muted); margin: 0; }

@keyframes ring { 0% { box-shadow: 0 0 0 0 rgba(34, 80, 217, 0.35); } 100% { box-shadow: 0 0 0 18px rgba(34, 80, 217, 0); } }
@keyframes dotv { 0% { top: -6px; opacity: 0; } 20% { opacity: 1; } 80% { opacity: 1; } 100% { top: 100%; opacity: 0; } }

.data-ai__stage { position: relative; width: 100%; max-width: 1040px; margin: 0 auto; aspect-ratio: 1040 / 440; }
.data-ai__col-label { position: absolute; top: 0; font-size: 12.5px; font-weight: 600; color: var(--muted); }
.data-ai__col-label--src { left: 0; width: 21.1538%; }
.data-ai__col-label--hub { left: 39.4231%; width: 21.1538%; text-align: center; color: var(--blue); }
.data-ai__col-label--out { left: 78.8462%; width: 21.1538%; }
.data-ai__svg { position: absolute; left: 0; top: 0; width: 100%; height: 100%; pointer-events: none; }
.js-dataai-path-in, .js-dataai-path-out { stroke: var(--border-2); transition: stroke 0.6s; }
.js-dataai-dot-in, .js-dataai-dot-out { opacity: 0; transition: opacity 0.5s; }

.data-ai__node {
  position: absolute;
  left: 0;
  width: 21.1538%;
  height: 11.8182%;
  box-sizing: border-box;
  display: flex;
  align-items: center;
  padding: 0 18px;
  font-size: 16px;
  font-weight: 600;
  background: #fff;
  color: var(--gray-3);
  border: 1.5px solid var(--gray-light);
  border-radius: 6px;
  transition: all 0.5s;
}
.data-ai__node--out {
  left: 78.8462%;
  height: 20.9091%;
  flex-direction: column;
  justify-content: center;
  gap: 2px;
}
.data-ai__node--out strong { font-size: 17px; font-weight: 700; }
.data-ai__node--out span { font-size: 12.5px; line-height: 1.7; opacity: 0.8; }

.data-ai__hub {
  position: absolute;
  left: 39.4231%;
  top: 30%;
  width: 21.1538%;
  height: 45.4545%;
  box-sizing: border-box;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 10px;
  text-align: center;
  background: #fff;
  color: var(--gray-3);
  border: 1.5px solid var(--border-2);
  border-radius: 6px;
  transition: all 0.6s;
}
.data-ai__hub.is-pulsing { animation: ring 1s ease-out 1; }
.data-ai__hub-title { font-size: 19px; font-weight: 700; }
.data-ai__hub-subs { display: grid; gap: 4px; font-size: 13px; line-height: 1.6; opacity: 0.85; }

.data-ai__mobile { display: none; }
.data-ai__mobile-srcs { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 8px; }
.data-ai__chip {
  padding: 12px 8px;
  text-align: center;
  font-size: 14.5px;
  font-weight: 600;
  background: #fff;
  color: var(--gray-3);
  border: 1.5px solid var(--gray-light);
  border-radius: 6px;
  transition: all 0.5s;
}
.data-ai__connector { position: relative; height: 40px; width: 2px; margin: 0 auto; background: var(--border-2); overflow: hidden; transition: background 0.5s; }
.data-ai__connector-dot { position: absolute; left: -2px; width: 6px; height: 6px; border-radius: 50%; background: var(--blue); animation: dotv 1.3s linear infinite; }
.data-ai__mobile .data-ai__hub { position: static; width: auto; height: auto; padding: 20px 12px; }
.data-ai__hub-subs--inline { font-size: 12.5px; }
.data-ai__mobile-outs { display: grid; gap: 8px; }
.data-ai__card {
  padding: 12px 16px;
  background: #fff;
  color: var(--gray-3);
  border: 1.5px solid var(--gray-light);
  border-radius: 6px;
  transition: all 0.5s;
}
.data-ai__card strong { display: block; font-size: 16px; font-weight: 700; }
.data-ai__card span { font-size: 12.5px; line-height: 1.7; opacity: 0.8; }

.data-ai__footnote { font-size: 15.5px; line-height: 2; max-width: 720px; margin: 40px 0 0; color: var(--muted-2); }

@media (max-width: 860px) {
  .data-ai__head { margin-bottom: 28px; }
  .data-ai__head h2 { font-size: 24px; margin: 0 0 6px; }
  .data-ai__head p { font-size: 13px; }
  .data-ai__stage { display: none; }
  .data-ai__mobile { display: block; }
  .data-ai__mobile .data-ai__col-label { margin-bottom: 8px; }
  .data-ai__footnote { font-size: 14px; line-height: 1.9; margin: 24px 0 0; }
}

/* ---------- Before / After ---------- */
.before-after__head { display: flex; justify-content: space-between; align-items: flex-end; margin-bottom: 52px; }
.before-after__head h2 { font-size: 34px; line-height: 1.6; margin: 0 0 6px; font-weight: 700; letter-spacing: -0.015em; }
.before-after__head p { font-size: 14px; color: var(--muted); }
.before-after__tabs { display: flex; gap: 28px; }
.js-ba-tab {
  background: none;
  border: none;
  font-size: 15px;
  font-weight: 600;
  color: var(--gray-3);
  padding-bottom: 6px;
  border-bottom: 2px solid transparent;
}
.js-ba-tab.is-active { color: var(--navy); border-bottom-color: var(--navy); }

.ba-diagram--desktop { display: grid; gap: 56px; }
.ba-diagram--mobile { display: none; }

.ba-row { display: grid; grid-template-columns: 200px minmax(0, 1fr); gap: 40px; align-items: start; transition: opacity 0.8s; }
.js-ba-before { opacity: 1; }
.js-ba-after { opacity: 0.4; }
.ba-row__label-title { font-size: 15px; font-weight: 700; }
.ba-row__label-title--after { color: var(--blue); }
.ba-row__label-sub { font-size: 13px; color: var(--muted); }
.ba-row__nodes { display: flex; }
.ba-node { flex: 1; }
.ba-node__row { display: flex; align-items: center; }
.ba-node__dot { width: 14px; height: 14px; border-radius: 50%; flex: none; display: block; }
.ba-node__dot--before { background: #fff; border: 1.5px solid var(--gray-3); }
.ba-node__line { flex: 1; height: 2px; margin: 0 8px; background: var(--border-2); position: relative; display: block; }
.ba-node__fill { position: absolute; left: 0; top: 0; bottom: 0; width: 0%; background: var(--blue); transition: width 0.6s ease; }
.ba-node__label { margin-top: 10px; font-size: 16px; font-weight: 600; color: var(--muted-2); }
.ba-node__sub { font-size: 12.5px; color: var(--muted-3); }
.js-after-dot { background: #fff; border: 1.5px solid var(--border-2); transition: all 0.5s; }
.js-after-fill { background: var(--blue); }

@media (max-width: 860px) {
  .before-after__head { flex-direction: column; align-items: flex-start; margin-bottom: 22px; }
  .before-after__head h2 { font-size: 24px; margin: 0 0 6px; }
  .before-after__head p { font-size: 12.5px; margin: 0 0 18px; }
  .before-after__tabs { gap: 24px; margin-bottom: 0; }
  .js-ba-tab { font-size: 14.5px; }

  .ba-diagram--desktop { display: none; }
  .ba-diagram--mobile { display: grid; gap: 30px; }
  .ba-col__title { font-size: 14px; font-weight: 700; }
  .ba-col__title span { font-size: 12px; font-weight: 400; color: var(--muted); margin-left: 6px; }
  .ba-col__title--after { color: var(--blue); }
  .ba-col__nodes { margin-top: 14px; }
  .ba-node-v { display: grid; grid-template-columns: 14px minmax(0, 1fr); gap: 14px; min-height: 44px; }
  .ba-node-v__rail { display: flex; flex-direction: column; align-items: center; }
  .ba-node-v__dot { width: 12px; height: 12px; border-radius: 50%; flex: none; display: block; }
  .ba-node-v__dot--before { background: #fff; border: 1.5px solid var(--gray-3); }
  .ba-node-v__bar { flex: 1; width: 2px; background: var(--border-2); position: relative; margin: 2px 0; }
  .ba-node-v__fill { position: absolute; left: 0; right: 0; top: 0; height: 0%; background: var(--blue); transition: height 0.6s ease; }
  .ba-node-v__label { font-size: 15px; font-weight: 600; line-height: 1.3; color: var(--muted-2); }
  .ba-node-v__sub { font-size: 12px; font-weight: 400; color: var(--muted-3); margin-top: 2px; }
  .js-after-dot { transition: all 0.5s; }
}

/* ---------- Proposals ---------- */
.proposals h2 { font-size: 34px; line-height: 1.6; margin: 0 0 52px; font-weight: 700; letter-spacing: -0.015em; }
.proposals__grid { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 72px; }
.proposal-card { border-top: 1px solid var(--navy); padding-top: 28px; }
.proposal-card h3 { font-size: 27px; line-height: 1.55; margin: 0 0 14px; font-weight: 700; letter-spacing: -0.01em; }
.proposal-card p { font-size: 17px; line-height: 2; color: var(--muted-2); }
.proposal-card__box { margin-top: 28px; border: 1px solid var(--border); border-radius: 6px; background: #fff; padding: 20px 22px 22px; }
.proposal-card__caption { display: flex; justify-content: space-between; font-size: 11.5px; color: var(--muted-3); margin-bottom: 16px; }
.proposal-card__stages { display: flex; }
.pc-stage { flex: 1; }
.pc-stage__row { display: flex; align-items: center; }
.pc-stage__dot { width: 12px; height: 12px; border-radius: 50%; border: 1.5px solid var(--gray-4); background: #fff; flex: none; display: block; transition: all 0.5s; }
.pc-stage__line { flex: 1; height: 2px; margin: 0 6px; background: #e3e8f0; position: relative; display: block; }
.pc-stage__fill { position: absolute; left: 0; top: 0; bottom: 0; width: 0%; background: var(--blue); transition: width 0.8s ease; }
.pc-stage__label { font-size: 12.5px; margin-top: 8px; font-weight: 500; color: var(--muted-3); transition: color 0.5s; }
.proposal-card__detail { position: relative; height: 122px; margin-top: 18px; background: var(--bg); border-radius: 4px; }
.pc-detail { position: absolute; left: 0; right: 0; top: 0; bottom: 0; padding: 14px 16px; box-sizing: border-box; opacity: 0; transition: opacity 0.5s; }
.pc-detail__title { font-size: 13px; font-weight: 600; }
.pc-detail__row { display: grid; grid-template-columns: 84px minmax(0, 1fr) 84px; gap: 10px; align-items: center; margin-top: 8px; font-size: 12px; color: var(--muted-2); }
.pc-detail__bar { height: 6px; border-radius: 3px; background: #e3e8f0; position: relative; }
.pc-detail__bar span { position: absolute; left: 0; top: 0; bottom: 0; background: var(--blue); border-radius: 3px; }
.pc-detail__row span:last-child { color: var(--muted); text-align: right; }

@media (max-width: 860px) {
  .proposals h2 { font-size: 24px; margin: 0 0 20px; }
  .proposals__grid { grid-template-columns: 1fr; gap: 0; }
  .proposal-card { padding: 18px 0 32px; }
  .proposal-card h3 { font-size: 19px; margin: 0 0 6px; }
  .proposal-card p { font-size: 14px; line-height: 1.9; }
  .proposal-card__box { margin-top: 16px; padding: 14px; }
  .pc-stage__label { font-size: 11px; line-height: 1.5; padding-right: 4px; }
  .proposal-card__detail { height: 132px; margin-top: 14px; }
  .pc-detail { padding: 12px; }
  .pc-detail__row { grid-template-columns: 62px minmax(0, 1fr) 54px; gap: 8px; font-size: 11px; }
}

/* ---------- Engineering stat ---------- */
.engineering { display: grid; grid-template-columns: minmax(0, 4fr) minmax(0, 8fr); gap: 64px; align-items: end; }
.engineering__num { font-size: 128px; line-height: 1; font-weight: 700; letter-spacing: -0.045em; }
.engineering__num-label { font-size: 19px; font-weight: 600; margin-top: 10px; }
.engineering__list { border-top: 1px solid var(--border-2); }
.engineering__list li { padding: 20px 0; border-bottom: 1px solid var(--border); font-size: 19px; font-weight: 500; }
.engineering__footnote { font-size: 12.5px; color: var(--muted-3); margin: 16px 0 0; }

@media (max-width: 860px) {
  .engineering { grid-template-columns: 1fr; gap: 14px; }
  .engineering__num { font-size: 64px; line-height: 1.05; letter-spacing: -0.04em; }
  .engineering__list li { padding: 14px 0; font-size: 15px; line-height: 1.7; }
  .engineering__footnote { font-size: 11.5px; margin: 10px 0 0; }
}

/* ---------- How it works ---------- */
.how-it-works h2 { font-size: 34px; line-height: 1.6; margin: 0 0 12px; font-weight: 700; letter-spacing: -0.015em; }
.how-it-works__lead { font-size: 16px; color: var(--muted); margin: 0 0 56px; }
.how-it-works__list {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 40px;
  border-top: 1px solid var(--navy);
}
.how-it-works__list li { padding-top: 22px; }
.how-it-works__n { display: block; font-size: 14px; color: var(--blue); font-weight: 600; }
.how-it-works__t { font-size: 22px; font-weight: 700; margin: 6px 0 10px; line-height: 1.5; }
.how-it-works__d { font-size: 14.5px; line-height: 1.95; color: var(--muted); }
.how-it-works__note { font-size: 16px; margin: 48px 0 0; color: var(--muted-2); }

@media (max-width: 860px) {
  .how-it-works h2 { font-size: 24px; line-height: 1.55; margin: 0 0 8px; }
  .how-it-works__lead { font-size: 13.5px; margin: 0 0 20px; }
  .how-it-works__list { grid-template-columns: 1fr; gap: 0; }
  .how-it-works__list li {
    display: grid;
    grid-template-columns: 24px minmax(0, 1fr);
    gap: 8px;
    padding: 18px 0;
    border-bottom: 1px solid var(--border);
  }
  .how-it-works__n { padding-top: 1px; font-size: 14px; }
  .how-it-works__t { font-size: 17px; margin: 0; line-height: 1.6; }
  .how-it-works__d { font-size: 13.5px; line-height: 1.85; }
  .how-it-works__note { font-size: 14px; line-height: 1.9; margin: 18px 0 0; }
}

/* ---------- About ---------- */
.about { display: grid; grid-template-columns: minmax(0, 4fr) minmax(0, 8fr); gap: 64px; }
.about__name { display: flex; align-items: baseline; gap: 16px; font-size: 40px; font-weight: 700; letter-spacing: -0.02em; }
.about__name-en { font-size: 17px; color: var(--muted); font-weight: 400; }
.about__bio { font-size: 17px; line-height: 2; max-width: 700px; color: var(--muted-2); }

@media (max-width: 860px) {
  .about { grid-template-columns: 1fr; gap: 10px; }
  .about__name { font-size: 30px; gap: 12px; }
  .about__name-en { font-size: 14px; }
  .about__bio { font-size: 14.5px; line-height: 1.95; }
}

/* ---------- Contact ---------- */
.contact-card {
  background: #edf4ff;
  border: 1px solid #c9d9f5;
  color: var(--navy);
  border-radius: 8px;
  padding: 80px;
}
.contact-card__main { max-width: 640px; }
.contact-card__main h2 { font-size: 40px; line-height: 1.55; margin: 0 0 24px; font-weight: 700; letter-spacing: -0.015em; color: var(--navy); }
.contact-card__main p { font-size: 17px; line-height: 2; max-width: 560px; margin: 0 0 36px; color: var(--muted); }
.contact-card__cta { display: flex; align-items: center; gap: 24px; }
.contact-card__cta .btn--primary { box-shadow: 0 10px 24px -14px rgba(34, 80, 217, 0.6); }
.contact-card__email { font-size: 14px; color: var(--muted); }

@media (max-width: 860px) {
  .contact-card { padding: 32px 20px; border-radius: 6px; }
  .contact-card__main { max-width: none; }
  .contact-card__main h2 { font-size: 24px; line-height: 1.6; margin: 0 0 14px; }
  .contact-card__main p { font-size: 14px; line-height: 1.95; margin: 0 0 24px; }
  .contact-card__cta { display: block; }
  .contact-card__cta .btn { display: block; text-align: center; padding: 15px; }
  .contact-card__email { display: block; text-align: center; font-size: 11.5px; margin-top: 10px; }
}

/* ---------- Footer ---------- */
.site-footer__inner {
  max-width: var(--page-max);
  margin: 0 auto;
  padding: 72px var(--pad-x) 48px;
  display: flex;
  align-items: baseline;
  gap: 28px;
  font-size: 13px;
  color: var(--muted);
}
.site-footer__brand { font-size: 17px; font-weight: 600; color: var(--navy); }
.site-footer__copy { margin-left: auto; }

@media (max-width: 860px) {
  .site-footer__inner { flex-direction: column; align-items: flex-start; gap: 4px; padding: 40px 20px 110px; font-size: 12px; }
  .site-footer__brand { font-size: 16px; }
  .site-footer__copy { margin-left: 0; }
}

/* ---------- Reduced motion: disable smooth scrolling ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .ba-row, .js-after-dot, .ba-node-v__fill, .ba-node__fill,
  .pc-stage__dot, .pc-stage__fill, .pc-stage__label, .pc-detail,
  .data-ai__node, .data-ai__hub, .data-ai__chip, .data-ai__card, .data-ai__connector,
  .data-ai__hub.is-pulsing, .data-ai__connector-dot,
  .btn { transition: none !important; animation: none !important; }
  .js-dataai-dot-in, .js-dataai-dot-out, .data-ai__connector-dot { display: none !important; }
}