/* BE CERA — BtoB page */

/* Intro */
.btob-intro {
  padding: clamp(100px, 14vw, 180px) 0 clamp(60px, 8vw, 100px);
  background: var(--bg);
}
.btob-intro__grid {
  display: flex;
  flex-direction: column;
  gap: clamp(24px, 3vw, 40px);
  max-width: 780px;
}
.btob-intro__grid .eyebrow { display: block; margin-bottom: 14px; }
.section-title-en {
  font-family: var(--serif-jp);
  font-weight: 400;
  font-size: clamp(17px, 1.8vw, 22px);
  letter-spacing: 0.06em;
  line-height: 1.9;
  color: var(--ink-soft);
  margin-top: 20px;
}

/* Use cases */
.usecases { padding: clamp(100px, 14vw, 180px) 0; background: var(--bg); }
.usecases__head { margin-bottom: clamp(60px, 8vw, 100px); }
.usecases__head .eyebrow { display: inline-block; margin-bottom: 14px; }

.usecases__list {
  border-top: 1px solid var(--line);
}
.ucase {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: clamp(32px, 5vw, 80px);
  align-items: start;
  padding: clamp(48px, 6vw, 80px) clamp(20px, 3vw, 40px);
  border-bottom: 1px solid var(--line);
  position: relative;
  transition: background .5s var(--ease), padding-left .5s var(--ease);
}
.ucase:hover {
  background: var(--bg-alt);
  padding-left: clamp(32px, 4vw, 60px);
}
.ucase__num-wrap {
  display: flex;
  align-items: baseline;
  gap: 14px;
  position: sticky;
  top: 120px;
}
.ucase__num {
  font-family: var(--serif-en);
  font-style: italic;
  font-weight: 300;
  font-size: clamp(72px, 9vw, 120px);
  line-height: .85;
  color: var(--accent);
  letter-spacing: 0.02em;
}
.ucase__num-label {
  font-family: var(--serif-en);
  font-style: italic;
  font-size: 11px;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--ink-mute);
  white-space: nowrap;
}
.ucase__body {
  max-width: 720px;
  display: flex;
  flex-direction: column;
  gap: 24px;
}
.ucase__icon-row {
  display: flex;
  align-items: center;
  gap: 18px;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--line);
}
.ucase__icon { width: 40px; height: 40px; color: var(--ink); flex-shrink: 0; }
.ucase__tag {
  font-family: var(--serif-en);
  font-style: italic;
  font-size: 12px;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--ink-mute);
}
.ucase__title { font-family: var(--serif-jp); font-weight: 500; font-size: clamp(22px, 2.6vw, 32px); letter-spacing: 0.08em; line-height: 1.6; color: var(--ink); }
.ucase__text { font-size: 15px; line-height: 2.1; color: var(--ink-soft); letter-spacing: 0.04em; }
.ucase__meta {
  display: flex;
  gap: clamp(24px, 4vw, 48px);
  flex-wrap: wrap;
  margin-top: 8px;
  padding-top: 20px;
  border-top: 1px solid var(--line);
}
.ucase__meta dt {
  font-family: var(--serif-en);
  font-style: italic;
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--ink-mute);
  margin-bottom: 4px;
}
.ucase__meta dd {
  font-family: var(--serif-jp);
  font-size: 13.5px;
  letter-spacing: 0.06em;
  color: var(--ink);
}

/* ============================================================
   Reasons (選ばれる理由)
============================================================ */
.reasons {
  padding: clamp(100px, 14vw, 180px) 0;
  background: var(--bg-alt);
  position: relative;
  overflow: hidden;
}
.reasons__head {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: end;
  gap: 32px;
  margin-bottom: clamp(48px, 6vw, 80px);
}
.reasons__head .eyebrow { display: block; margin-bottom: 14px; }
.reasons__head .ja {
  display: block;
  font-family: var(--serif-jp);
  font-size: 13px;
  letter-spacing: 0.24em;
  color: var(--ink-mute);
  margin-top: 14px;
}
.reasons__count {
  font-family: var(--serif-en);
  font-style: italic;
  font-size: 13px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--ink-mute);
}
.reasons__count em { font-size: 28px; color: var(--ink); font-style: italic; font-weight: 300; margin-right: 4px; }

.reasons__grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: clamp(14px, 1.6vw, 22px);
}
.reason {
  background: var(--bg);
  padding: clamp(28px, 3.5vw, 44px);
  display: flex;
  flex-direction: column;
  gap: 18px;
  transition: background .4s var(--ease), transform .4s var(--ease);
  border: 1px solid transparent;
}
.reason:hover {
  background: var(--bg);
  border-color: var(--line);
  transform: translateY(-2px);
}
.reason__head {
  display: flex;
  align-items: baseline;
  gap: 16px;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--line);
}
.reason__num {
  font-family: var(--serif-en);
  font-style: italic;
  font-weight: 300;
  font-size: clamp(40px, 4.4vw, 56px);
  line-height: .9;
  color: var(--accent);
  letter-spacing: 0.02em;
}
.reason__tag {
  font-family: var(--serif-en);
  font-style: italic;
  font-size: 11px;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--ink-mute);
}
.reason__title {
  font-family: var(--serif-jp);
  font-weight: 500;
  font-size: clamp(16px, 1.4vw, 19px);
  line-height: 1.7;
  letter-spacing: 0.08em;
  color: var(--ink);
}
.reason__text {
  font-size: 14px;
  line-height: 2;
  color: var(--ink-soft);
  letter-spacing: 0.04em;
}
/* 5-card bento: top 3 equal, bottom 2 wider */
.reason--01 { grid-column: span 4; }
.reason--02 { grid-column: span 4; }
.reason--03 { grid-column: span 4; }
.reason--04 { grid-column: span 6; }
.reason--05 { grid-column: span 6; }

@media (max-width: 880px) {
  .reasons__head { grid-template-columns: 1fr; }
  .reasons__count { justify-self: start; }
  .reason--01, .reason--02, .reason--03 { grid-column: span 6; }
  .reason--04, .reason--05 { grid-column: span 12; }
}
@media (max-width: 540px) {
  .reason--01, .reason--02, .reason--03,
  .reason--04, .reason--05 { grid-column: span 12; }
}

/* Flow */
.flow { padding: clamp(100px, 14vw, 180px) 0; background: var(--bg-alt); }
.flow__head { margin-bottom: clamp(60px, 8vw, 90px); }
.flow__head .eyebrow { display: inline-block; margin-bottom: 14px; }

.flow__steps { display: grid; grid-template-columns: repeat(5, 1fr); gap: 0; position: relative; }
.flow__steps::before { content: ""; position: absolute; top: 40px; left: 8%; right: 8%; height: 1px; background: var(--line); z-index: 0; }
.fstep { padding: 0 16px; text-align: center; position: relative; z-index: 1; }
.fstep__dot { width: 72px; height: 72px; margin: 0 auto 24px; border: 1px solid var(--line); background: var(--bg-alt); border-radius: 50%; display: grid; place-items: center; font-family: var(--serif-en); font-style: italic; font-weight: 300; font-size: 26px; color: var(--ink); transition: all .4s var(--ease); }
.fstep:hover .fstep__dot { background: var(--ink); color: var(--bg); }
.fstep__label { font-family: var(--serif-en); font-size: 11px; letter-spacing: 0.24em; text-transform: none; color: var(--ink-mute); margin-bottom: 10px; display: block; }
.fstep__title { font-family: var(--serif-jp); font-weight: 500; font-size: 16px; letter-spacing: 0.08em; color: var(--ink); margin-bottom: 10px; }
.fstep__text { font-size: 13px; line-height: 1.9; }

/* Testimonials */
.testi { padding: clamp(100px, 14vw, 180px) 0; background: var(--bg); }
.testi__head { margin-bottom: clamp(50px, 7vw, 80px); }
.testi__head .eyebrow { display: inline-block; margin-bottom: 14px; }
.testi__grid { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(24px, 3vw, 48px); }
.tcard { padding: clamp(32px, 4vw, 56px); background: var(--bg-alt); position: relative; }
.tcard::before { content: "“"; position: absolute; top: 16px; left: 24px; font-family: var(--serif-en); font-size: 96px; line-height: 1; color: var(--accent); opacity: .3; }
.tcard__heading {
  font-family: var(--serif-jp);
  font-weight: 500;
  font-size: 19px;
  letter-spacing: 0.06em;
  line-height: 1.8;
  color: var(--ink);
  margin-bottom: 24px;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--line);
  position: relative;
  z-index: 1;
}
.tcard__list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 14px;
  position: relative;
  z-index: 1;
}
.tcard__list li {
  font-size: 15px;
  line-height: 2;
  letter-spacing: 0.04em;
  position: relative;
  z-index: 1;
}
.tcard__text { font-size: 15px; line-height: 2; margin-bottom: 20px; position: relative; z-index: 1; letter-spacing: 0.04em; }
.tcard__note {
  font-size: 11px;
  color: var(--ink-mute);
  letter-spacing: 0.06em;
  line-height: 1.8;
  position: relative;
  z-index: 1;
  margin-top: 16px;
}
.tcard__author { font-family: var(--serif-en); font-style: italic; font-size: 13px; color: var(--ink-mute); letter-spacing: 0.14em; padding-top: 20px; border-top: 1px solid var(--line); }
.tcard__author .ja { display: block; font-family: var(--serif-jp); font-size: 14px; color: var(--ink); letter-spacing: 0.08em; margin-top: 4px; font-style: normal; }

/* FAQ */
.faq { padding: clamp(100px, 14vw, 180px) 0; background: var(--bg-alt); }
.faq .container { max-width: 880px; }
.faq__head { margin-bottom: clamp(50px, 7vw, 80px); }
.faq__head .eyebrow { display: inline-block; margin-bottom: 14px; }

.faq__list { max-width: 880px; margin: 0 auto; border-top: 1px solid var(--line); }
.faq__item { border-bottom: 1px solid var(--line); }
.faq__item summary { list-style: none; cursor: pointer; padding: 28px 8px; display: grid; grid-template-columns: 40px 1fr 28px; align-items: center; gap: 20px; transition: padding .3s var(--ease); }
.faq__item summary::-webkit-details-marker { display: none; }
.faq__item summary:hover { padding-left: 16px; }
.faq__q-label { font-family: var(--serif-en); font-style: italic; font-size: 22px; color: var(--accent); }
.faq__q-text { font-family: var(--serif-jp); font-size: 16px; letter-spacing: 0.06em; color: var(--ink); font-weight: 500; }
.faq__toggle { width: 24px; height: 24px; position: relative; justify-self: end; }
.faq__toggle::before, .faq__toggle::after { content: ""; position: absolute; background: var(--ink); transition: transform .3s var(--ease); }
.faq__toggle::before { top: 50%; left: 0; right: 0; height: 1px; }
.faq__toggle::after { left: 50%; top: 0; bottom: 0; width: 1px; }
.faq__item[open] .faq__toggle::after { transform: scaleY(0); }
.faq__answer { padding: 0 8px 28px 60px; }

/* Catalog Download */
.catalog-dl {
  padding: clamp(100px, 14vw, 180px) 0;
  background-color: oklch(0.9 0.04 34.87);
  background-image: repeating-linear-gradient(
    45deg,
    rgba(255,255,255,0.12) 0px,
    rgba(255,255,255,0.12) 2px,
    transparent 2px,
    transparent 20px
  );
  color: var(--ink);
  text-align: center;
}
.catalog-dl__inner { max-width: 680px; margin: 0 auto; }
.catalog-dl .eyebrow { display: inline-block; color: var(--ink-mute); margin-bottom: 18px; }
.catalog-dl .eyebrow::before { background: var(--ink-mute); }
.catalog-dl .section-headline-en { margin-bottom: 28px; }
.catalog-dl p { font-size: 16px; line-height: 2; margin-bottom: 48px; letter-spacing: 0.06em; }
.catalog-dl__btns { display: flex; flex-direction: column; gap: 16px; align-items: center; }
.catalog-dl .btn { border-color: var(--ink); color: var(--ink); }
.catalog-dl .btn::before { background: var(--ink); }
.catalog-dl .btn:hover { color: var(--bg); }

/* Final CTA */
.btob-final {
  padding: clamp(100px, 14vw, 180px) 0;
  background-color: oklch(0.9 0.04 34.87);
  background-image: repeating-linear-gradient(
    45deg,
    rgba(255,255,255,0.12) 0px,
    rgba(255,255,255,0.12) 2px,
    transparent 2px,
    transparent 20px
  );
  color: var(--ink);
  text-align: center;
}
.btob-final .eyebrow { display: inline-block; color: var(--ink-mute); margin-bottom: 18px; }
.btob-final .eyebrow::before { background: var(--ink-mute); }
.btob-final .section-headline-en { margin-bottom: 32px; }
.btob-final .section-headline-en em { font-style: italic; font-weight: 400; }
.btob-final p { font-size: 16px; line-height: 2; margin-bottom: 48px; letter-spacing: 0.06em; }
.btob-final .btn { border-color: var(--ink); color: var(--ink); }
.btob-final .btn::before { background: var(--ink); }
.btob-final .btn:hover { color: var(--bg); }

@media (max-width: 960px) {
  .ucase {
    grid-template-columns: 1fr;
    gap: 28px;
    padding: clamp(40px, 8vw, 64px) 0;
  }
  .ucase:hover { padding-left: 0; background: transparent; }
  .ucase__num-wrap { position: static; align-items: baseline; gap: 16px; }
  .ucase__num { font-size: clamp(56px, 14vw, 80px); }
  .flow__steps { grid-template-columns: 1fr 1fr; gap: 32px 0; }
  .flow__steps::before { display: none; }
  .testi__grid { grid-template-columns: 1fr; }
}
@media (max-width: 560px) {
  .ucase__meta { gap: 18px; }
  .flow__steps { grid-template-columns: 1fr; }
}