/* ============================================================
   DESIGN O — FLOW
   Step-driven vertical-scroll "journey". A sticky side index
   (left, desktop) scroll-spies the current step and highlights it
   with var(--accent). Big step numbers + a vertical connector line
   carry the eye down the page. All rules scoped under `.O`.
   Brand colours come only from theme tokens so the colour switcher
   re-skins this design too. Grey / white / near-black literals OK.
   ============================================================ */

.O { background: var(--page-bg); color: var(--text); }
.O .ph-img { object-fit: cover; }

/* ---- reusable bits ---------------------------------------- */
.O .O-eyebrow {
  display: inline-flex; align-items: center; gap: 12px;
  font-family: var(--display); font-size: 14px; letter-spacing: .22em;
  color: var(--accent); text-transform: uppercase;
}
.O .O-eyebrow .bar { width: 30px; height: 1px; background: var(--accent); }
.O .O-eyebrow.light { color: var(--accent-2); }
.O .O-eyebrow.light .bar { background: var(--accent-2); }

.O .O-ar {
  width: 26px; height: 1px; background: currentColor; position: relative;
  display: inline-block; transition: width .3s;
}
.O .O-ar::after {
  content: ""; position: absolute; right: 0; top: -3px;
  width: 6px; height: 6px; border-top: 1px solid currentColor;
  border-right: 1px solid currentColor; transform: rotate(45deg);
}

/* ============================================================
   HEADER — simple, static; top padding clears the floating
   control bar (~90px tall, top:14px, centred).
   ============================================================ */
.O-header {
  display: flex; align-items: center; gap: 26px;
  max-width: 1180px; margin: 0 auto;
  padding: 112px 40px 22px;
}
.O-brand { display: flex; align-items: center; gap: 12px; }
.O-brand-name {
  font-family: var(--serif-jp); font-weight: 600; font-size: 19px;
  letter-spacing: .04em; line-height: 1.15; color: var(--text);
}
.O-brand-name small {
  display: block; font-family: var(--display); font-size: 9px;
  letter-spacing: .4em; color: var(--accent); margin-top: 4px; font-weight: 500;
}
.O-nav { margin-left: auto; display: flex; gap: 26px; }
.O-nav a {
  font-size: 13.5px; letter-spacing: .04em; color: var(--text-soft);
  position: relative; padding: 4px 0; transition: color .25s;
}
.O-nav a::after {
  content: ""; position: absolute; left: 0; bottom: 0; width: 0; height: 1px;
  background: var(--accent); transition: width .25s;
}
.O-nav a:hover { color: var(--text); }
.O-nav a:hover::after { width: 100%; }
.O-hcta {
  display: inline-flex; align-items: center; gap: 12px;
  padding: 12px 22px; border-radius: 999px;
  background: var(--brand); color: var(--on-brand);
  font-size: 13px; letter-spacing: .06em; transition: background .25s, transform .25s;
}
.O-hcta:hover { background: var(--brand-2); transform: translateY(-1px); }
.O-hcta .O-ar { color: var(--on-brand); }
.O-hcta:hover .O-ar { width: 34px; }

/* ============================================================
   HERO
   ============================================================ */
.O-hero {
  max-width: 1180px; margin: 0 auto;
  padding: 40px 40px 90px;
  display: grid; grid-template-columns: 1.05fr .95fr; align-items: center; gap: 56px;
}
.O-hero-copy h1 {
  font-family: var(--serif-jp); font-weight: 600; font-size: 52px; line-height: 1.4;
  letter-spacing: .02em; color: var(--text); margin: 22px 0 0;
}
.O-hero-sub {
  margin-top: 22px; font-family: var(--serif-jp); font-weight: 500;
  font-size: 19px; line-height: 1.7; letter-spacing: .04em; color: var(--brand);
}
.O-hero-lead {
  margin-top: 20px; font-size: 14.5px; line-height: 2.1; letter-spacing: .03em;
  color: var(--text-soft); max-width: 480px;
}
.O-hero-actions { margin-top: 34px; display: flex; flex-wrap: wrap; gap: 16px; }
.O-btn {
  display: inline-flex; align-items: center; gap: 14px;
  padding: 15px 30px; border-radius: 999px;
  background: var(--brand); color: var(--on-brand);
  font-size: 14px; letter-spacing: .06em; transition: background .25s, transform .25s;
}
.O-btn:hover { background: var(--brand-2); transform: translateY(-2px); }
.O-btn .O-ar { color: var(--on-brand); }
.O-btn:hover .O-ar { width: 34px; }
.O-btn.ghost {
  background: transparent; color: var(--brand);
  border: 1px solid var(--brand-line);
}
.O-btn.ghost:hover { background: var(--brand-soft); }

.O-hero-visual { position: relative; }
.O-hero-fig {
  position: relative; height: 460px; overflow: hidden;
  border-radius: 4px; box-shadow: 0 30px 60px -30px color-mix(in srgb, var(--brand-ink) 55%, transparent);
}
.O-hero-fig::before {
  content: ""; position: absolute; right: -16px; bottom: -16px;
  width: 96px; height: 96px; z-index: 2;
  border-right: 2px solid var(--accent); border-bottom: 2px solid var(--accent);
}
.O-hero-fig .ph { position: absolute; inset: 0; }
.O-hero-mini {
  position: absolute; left: -26px; top: 40px;
  background: var(--page-bg); border: 1px solid var(--line);
  box-shadow: 0 20px 44px -24px color-mix(in srgb, var(--brand-ink) 45%, transparent);
  border-radius: 10px; padding: 14px 18px; display: flex; flex-direction: column; gap: 12px;
}
.O-hero-mini li {
  display: flex; align-items: center; gap: 12px;
  font-family: var(--serif-jp); font-size: 13.5px; letter-spacing: .04em; color: var(--text);
}
.O-hero-mini .n {
  font-family: var(--display); font-size: 15px; font-weight: 600;
  color: var(--accent); min-width: 20px;
}

/* ============================================================
   FLOW  — sticky index + big step sections
   ============================================================ */
.O-flow { background: var(--surface); padding: 90px 0 100px; }
.O-flow-head {
  max-width: 1180px; margin: 0 auto; padding: 0 40px;
}
.O-flow-head h2 {
  font-family: var(--serif-jp); font-weight: 600; font-size: 32px;
  letter-spacing: .04em; color: var(--text); margin-top: 14px;
}
.O-flow-head p {
  margin-top: 18px; font-size: 14px; line-height: 2; color: var(--text-soft); max-width: 620px;
}
.O-flow-head.center { text-align: center; }
.O-flow-head.center .O-eyebrow { justify-content: center; }

.O-flow-wrap {
  max-width: 1180px; margin: 48px auto 0; padding: 0 40px;
  display: grid; grid-template-columns: 230px 1fr; gap: 56px; align-items: start;
}

/* sticky side index */
.O-index { position: sticky; top: 118px; align-self: start; }
.O-index-lab {
  display: block; font-family: var(--display); font-size: 13px;
  letter-spacing: .34em; color: var(--text-soft); margin-bottom: 20px;
}
.O-index-list {
  list-style: none; position: relative; padding-left: 20px;
}
.O-index-list::before {
  content: ""; position: absolute; left: 3px; top: 8px; bottom: 8px; width: 2px;
  background: var(--brand-line);
}
.O-index-item { position: relative; margin: 4px 0; }
.O-index-item::before {
  content: ""; position: absolute; left: -20px; top: 14px;
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--brand-line); transition: background .3s, transform .3s;
}
.O-index-item a {
  display: flex; align-items: baseline; gap: 12px;
  padding: 10px 12px; border-radius: 8px;
  transition: background .25s;
}
.O-index-item .no {
  font-family: var(--display); font-size: 15px; font-weight: 600;
  letter-spacing: .06em; color: var(--text-soft); min-width: 22px; transition: color .3s;
}
.O-index-item .jp {
  font-family: var(--serif-jp); font-size: 15px; font-weight: 500;
  letter-spacing: .04em; color: var(--text-soft); transition: color .3s;
}
.O-index-item.on::before {
  background: var(--accent); transform: scale(1.5);
  box-shadow: 0 0 0 4px color-mix(in srgb, var(--accent) 22%, transparent);
}
.O-index-item.on a { background: color-mix(in srgb, var(--accent) 12%, transparent); }
.O-index-item.on .no { color: var(--accent); }
.O-index-item.on .jp { color: var(--text); font-weight: 600; }

/* big step sections */
.O-steps { position: relative; }
.O-step {
  display: grid; grid-template-columns: 96px 1fr; gap: 28px;
  padding-bottom: 56px; position: relative;
}
.O-step-rail { position: relative; }
.O-step-rail::before {
  content: ""; position: absolute; left: 27px; top: 18px; bottom: -56px; width: 2px;
  background: linear-gradient(var(--brand-line), color-mix(in srgb, var(--brand-line) 30%, transparent));
}
.O-step.last .O-step-rail::before { display: none; }
.O-step-dot {
  position: absolute; left: 22px; top: 8px; width: 12px; height: 12px;
  border-radius: 50%; background: var(--accent);
  box-shadow: 0 0 0 5px color-mix(in srgb, var(--accent) 18%, transparent);
}
.O-step-no {
  font-family: var(--display); font-size: 62px; font-weight: 400; line-height: 1;
  color: var(--accent); display: block; padding-top: 30px; opacity: .9;
}
.O-step-body {
  background: var(--page-bg); border: 1px solid var(--line);
  border-radius: 14px; padding: 32px 34px;
  box-shadow: 0 20px 50px -34px color-mix(in srgb, var(--brand-ink) 40%, transparent);
}
.O-step-en {
  font-family: var(--display); font-size: 12.5px; letter-spacing: .2em;
  text-transform: uppercase; color: var(--text-soft);
}
.O-step-body h3 {
  font-family: var(--serif-jp); font-weight: 600; font-size: 26px;
  letter-spacing: .04em; color: var(--text); margin-top: 10px;
}
.O-step-lead {
  margin-top: 14px; font-family: var(--serif-jp); font-weight: 500;
  font-size: 17px; letter-spacing: .03em; color: var(--brand);
}
.O-step-p {
  margin-top: 12px; font-size: 14px; line-height: 2.05; color: var(--text-soft);
}
.O-step-foot {
  margin-top: 22px; display: inline-flex; align-items: center; gap: 14px;
  padding: 12px 18px; border-radius: 999px;
  background: var(--brand-soft);
}
.O-step-icon { display: inline-flex; color: var(--brand); }
.O-step-icon svg { width: 24px; height: 24px; }
.O-step-note {
  font-size: 12.5px; letter-spacing: .04em; color: var(--brand); font-weight: 500;
}
.O-step-fig {
  margin-top: 22px; position: relative; height: 200px; overflow: hidden; border-radius: 10px;
}
.O-step-fig .ph { position: absolute; inset: 0; }

/* ============================================================
   SERVICE — 3 pillars
   ============================================================ */
.O-serv { max-width: 1180px; margin: 0 auto; padding: 96px 40px; }
.O-serv-grid {
  margin-top: 48px; display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px;
}
.O-serv-card {
  position: relative; display: flex; flex-direction: column;
  padding: 40px 30px 32px; border: 1px solid var(--line); border-radius: 14px;
  background: var(--page-bg); overflow: hidden;
  transition: transform .3s, box-shadow .3s, border-color .3s;
}
.O-serv-card::before {
  content: ""; position: absolute; left: 0; top: 0; width: 100%; height: 3px;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  transform: scaleX(0); transform-origin: left; transition: transform .35s;
}
.O-serv-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 26px 54px -30px color-mix(in srgb, var(--brand-ink) 45%, transparent);
  border-color: var(--brand-line);
}
.O-serv-card:hover::before { transform: scaleX(1); }
.O-serv-no {
  font-family: var(--display); font-size: 15px; font-weight: 600;
  letter-spacing: .14em; color: var(--accent);
}
.O-serv-ic { display: inline-flex; margin-top: 18px; color: var(--brand); }
.O-serv-ic svg { width: 42px; height: 42px; }
.O-serv-jp {
  margin-top: 22px; font-family: var(--serif-jp); font-weight: 600; font-size: 20px;
  letter-spacing: .03em; color: var(--text);
}
.O-serv-en {
  margin-top: 6px; font-family: var(--display); font-size: 11.5px;
  letter-spacing: .22em; text-transform: uppercase; color: var(--text-soft);
}
.O-serv-p {
  margin-top: 16px; font-size: 13.5px; line-height: 1.95; color: var(--text-soft); flex: 1;
}
.O-serv-more {
  margin-top: 24px; display: inline-flex; align-items: center; gap: 14px;
  font-size: 13px; letter-spacing: .06em; color: var(--brand);
}
.O-serv-card:hover .O-serv-more .O-ar { width: 34px; }

/* ============================================================
   NEWS
   ============================================================ */
.O-news { background: var(--surface); padding: 90px 0; }
.O-news-inner { max-width: 900px; margin: 0 auto; padding: 0 40px; }
.O-news-head h2 {
  font-family: var(--serif-jp); font-weight: 600; font-size: 30px;
  letter-spacing: .04em; color: var(--text); margin-top: 14px;
}
.O-news-list { margin-top: 34px; border-top: 1px solid var(--line); }
.O-news-row {
  display: flex; align-items: center; gap: 30px; padding: 22px 6px;
  border-bottom: 1px solid var(--line); transition: background .25s, padding-left .25s;
}
.O-news-row .date {
  font-family: var(--display); font-size: 16px; letter-spacing: .05em;
  color: var(--text-soft); min-width: 92px;
}
.O-news-row .ttl { font-size: 14.5px; color: var(--text); flex: 1; }
.O-news-row .chev { color: var(--brand-line); transition: transform .25s, color .25s; }
.O-news-row:hover { background: color-mix(in srgb, var(--brand) 4%, transparent); padding-left: 14px; }
.O-news-row:hover .chev { transform: translateX(4px); color: var(--brand); }
.O-news-more {
  margin-top: 30px; display: inline-flex; align-items: center; gap: 14px;
  font-size: 13px; letter-spacing: .06em; color: var(--brand);
}
.O-news-more:hover .O-ar { width: 34px; }

/* ============================================================
   CONTACT band
   ============================================================ */
.O-contact {
  background: linear-gradient(120deg, var(--brand) 0%, var(--brand-2) 100%);
  color: #fff; padding: 84px 0;
}
.O-contact-inner {
  max-width: 1080px; margin: 0 auto; padding: 0 40px;
  display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: center;
}
.O-contact-copy h2 {
  font-family: var(--serif-jp); font-weight: 600; font-size: 30px;
  letter-spacing: .04em; color: #fff; margin-top: 14px;
}
.O-contact-copy p {
  margin-top: 18px; font-size: 13.5px; line-height: 2; letter-spacing: .03em;
  color: rgba(255,255,255,.82);
}
.O-contact-actions { display: grid; gap: 18px; }
.O-cbtn {
  display: flex; align-items: center; gap: 16px; padding: 24px 28px;
  border: 1px solid rgba(255,255,255,.32); border-radius: 12px;
  transition: background .3s, border-color .3s;
}
.O-cbtn:hover { background: rgba(255,255,255,.08); border-color: rgba(255,255,255,.6); }
.O-cbtn-ic { display: inline-flex; color: var(--accent-2); }
.O-cbtn .txt { display: flex; flex-direction: column; gap: 4px; }
.O-cbtn .big {
  font-family: var(--display); font-size: 30px; font-weight: 600; letter-spacing: .04em; color: #fff;
}
.O-cbtn .lab { font-size: 15px; letter-spacing: .06em; color: #fff; }
.O-cbtn .sub { font-size: 11px; letter-spacing: .08em; color: rgba(255,255,255,.72); }
.O-cbtn.form .O-ar.light { color: #fff; margin-left: auto; }

/* footer via shared <Footer variant="A"> */
.O .ft-wrap { max-width: 1120px; }

/* ============================================================
   RESPONSIVE — 1280
   ============================================================ */
@media (max-width: 1280px) {
  .O-hero { gap: 40px; }
  .O-hero-copy h1 { font-size: 44px; }
  .O-hero-fig { height: 400px; }
  .O-flow-wrap { grid-template-columns: 200px 1fr; gap: 40px; }
  .O-serv-grid { gap: 20px; }
}

/* tablet: index moves above steps as a horizontal chip row */
@media (max-width: 980px) {
  .O-hero {
    grid-template-columns: 1fr; padding-bottom: 60px;
  }
  .O-hero-visual { order: -1; }
  .O-hero-mini { position: static; margin-top: 16px; flex-direction: row; flex-wrap: wrap; }
  .O-hero-fig { height: 320px; }

  .O-flow-wrap { grid-template-columns: 1fr; gap: 24px; }
  .O-index {
    position: sticky; top: 96px; z-index: 20;
    background: color-mix(in srgb, var(--surface) 92%, transparent);
    backdrop-filter: blur(6px);
    margin: 0 -40px; padding: 12px 40px;
    border-bottom: 1px solid var(--line);
  }
  .O-index-lab { display: none; }
  .O-index-list { padding-left: 0; display: flex; gap: 8px; overflow-x: auto; }
  .O-index-list::before { display: none; }
  .O-index-item::before { display: none; }
  .O-index-item { margin: 0; }
  .O-index-item a {
    white-space: nowrap; padding: 8px 14px; border: 1px solid var(--line);
    border-radius: 999px; background: var(--page-bg);
  }
  .O-index-item .no, .O-index-item .jp { font-size: 13px; }

  .O-serv-grid { grid-template-columns: 1fr; max-width: 460px; margin-left: auto; margin-right: auto; }
  .O-contact-inner { grid-template-columns: 1fr; gap: 30px; }
}

/* phone: single column, no horizontal scroll */
@media (max-width: 720px) {
  .O-header { flex-wrap: wrap; gap: 14px 18px; padding: 100px 20px 18px; }
  .O-nav { margin-left: 0; order: 3; width: 100%; flex-wrap: wrap; gap: 12px 18px; }
  .O-hcta { margin-left: auto; }

  .O-hero { padding: 26px 20px 50px; }
  .O-hero-copy h1 { font-size: 32px; }
  .O-hero-sub { font-size: 16px; }
  .O-hero-fig { height: 240px; }
  .O-hero-fig::before { display: none; }
  .O-hero-mini { padding: 12px 14px; gap: 10px 16px; }

  .O-flow { padding: 60px 0 70px; }
  .O-flow-head { padding: 0 20px; }
  .O-flow-head h2 { font-size: 25px; }
  .O-flow-wrap { padding: 0 20px; margin-top: 26px; }
  .O-index { margin: 0 -20px; padding: 10px 20px; top: 88px; }

  .O-step { grid-template-columns: 54px 1fr; gap: 14px; padding-bottom: 40px; }
  .O-step-rail::before { left: 15px; top: 14px; bottom: -40px; }
  .O-step-dot { left: 10px; top: 6px; width: 10px; height: 10px; }
  .O-step-no { font-size: 40px; padding-top: 20px; }
  .O-step-body { padding: 24px 22px; border-radius: 12px; }
  .O-step-body h3 { font-size: 22px; }
  .O-step-lead { font-size: 15.5px; }
  .O-step-fig { height: 160px; }

  .O-serv { padding: 64px 20px; }
  .O-serv-grid { margin-top: 32px; }
  .O-news { padding: 60px 0; }
  .O-news-inner { padding: 0 20px; }
  .O-news-head h2, .O-contact-copy h2 { font-size: 24px; }
  .O-news-row { gap: 6px 14px; padding: 18px 4px; flex-wrap: wrap; }
  .O-news-row .date { min-width: 0; font-size: 14px; }
  .O-news-row .ttl { flex: 1 1 100%; font-size: 14px; }
  .O-news-row:hover { padding-left: 4px; }

  .O-contact { padding: 60px 0; }
  .O-contact-inner { padding: 0 20px; }
  .O-cbtn { padding: 20px; }
  .O-cbtn .big { font-size: 25px; }
}

@media (max-width: 400px) {
  .O-hero-copy h1 { font-size: 28px; }
  .O-brand-name { font-size: 17px; }
  .O-cbtn .big { font-size: 22px; }
}