/* index.css — ページ固有スタイル（共通は common.css） */

/* ============================
   ヘッダー
============================ */
#header {
  position: fixed;
  inset-block-start: 0;
  inset-inline: 0;
  z-index: 100;
  transition: background var(--tr), border-color var(--tr), transform 0.35s cubic-bezier(0.4,0,0.2,1);
  border-block-end: 1px solid transparent;
}
#header.scrolled {
  background: rgba(10,10,10,.92);
  backdrop-filter: blur(16px);
  border-block-end-color: rgba(255,255,255,.06);
}
#header.header--hidden { transform: translateY(-100%); }

/* ============================
   ヒーロー
============================ */
#hero {
  position: relative;
  background: var(--black);
  min-height: 100svh;
  display: flex;
  align-items: flex-end;
  padding-block-end: 80px;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 65% 55% at 75% 55%, rgba(26,46,90,.65) 0%, transparent 70%),
    radial-gradient(ellipse 45% 45% at 15% 75%, rgba(26,46,90,.4) 0%, transparent 60%),
    linear-gradient(to right, rgba(10,10,10,.85) 40%, rgba(10,10,10,.3) 100%),
    linear-gradient(160deg, #0d1a35 0%, #0a0a0a 100%);
}

.hero-line {
  position: absolute;
  inset-block-start: 0;
  inset-inline-end: 22%;
  width: 1px;
  height: 100%;
  background: linear-gradient(to bottom, transparent, rgba(255,255,255,.06) 30%, rgba(255,255,255,.06) 70%, transparent);
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 760px;
}

.hero-eyebrow {
  font-family: var(--font-en);
  font-size: .72rem;
  font-weight: 500;
  letter-spacing: .2em;
  color: rgba(255,255,255,.4);
  margin-block-end: 1.5rem;
  display: flex;
  align-items: center;
  gap: 1rem;
}
.hero-eyebrow::before {
  content: '';
  display: block;
  width: 32px;
  height: 1px;
  background: rgba(255,255,255,.3);
}

.hero-title {
  font-size: clamp(2.2rem, 4.8vw, 4.2rem);
  font-weight: 700;
  color: var(--white);
  line-height: 1.15;
  letter-spacing: -.02em;
  margin-block-end: 2rem;
}

.hero-title-line {
  display: block;
  overflow: hidden;
}
.hero-title-line span {
  display: block;
  transform: translateY(110%);
  opacity: 0;
  animation: titleReveal 1.3s cubic-bezier(0.16, 1, 0.3, 1) forwards;
  animation-delay: 0.4s;
}
.hero-title-line:nth-child(2) span {
  animation-delay: 0.75s;
}

@keyframes titleReveal {
  to { transform: translateY(0); opacity: 1; }
}

.hero-title em {
  font-style: normal;
  display: block;
  color: rgba(255,255,255,.35);
  font-size: .55em;
  font-weight: 400;
  letter-spacing: .05em;
  margin-block-end: .3rem;
}

.hero-sub {
  font-size: .95rem;
  color: rgba(255,255,255,.5);
  line-height: 1.9;
  margin-block-end: 3rem;
  max-width: 440px;
  font-weight: 400;
}

.hero-actions {
  display: flex;
  gap: 1rem;
  align-items: center;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  font-family: var(--font-jp);
  font-size: .88rem;
  font-weight: 500;
  cursor: pointer;
  border: none;
  transition: background var(--tr), color var(--tr), transform var(--tr);
}
.btn:hover { transform: translateY(-1px); }

.btn-white {
  background: var(--white);
  color: var(--black);
  padding: .85rem 2rem;
}
.btn-white:hover { background: var(--off-white); }

.btn-ghost {
  background: transparent;
  color: rgba(255,255,255,.65);
  padding: .85rem 0;
  border-block-end: 1px solid rgba(255,255,255,.2);
  border-radius: 0;
  font-size: .82rem;
  letter-spacing: .04em;
}
.btn-ghost:hover { color: var(--white); border-block-end-color: var(--white); }
.btn-ghost:hover { transform: none; }

.hero-scroll {
  position: absolute;
  inset-inline-end: 2.5rem;
  inset-block-end: 2.5rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: .6rem;
  color: rgba(255,255,255,.25);
  font-family: var(--font-en);
  font-size: .65rem;
  letter-spacing: .15em;
}
.scroll-line {
  width: 1px;
  height: 48px;
  background: rgba(255,255,255,.15);
  position: relative;
  overflow: hidden;
}
.scroll-line::after {
  content: '';
  position: absolute;
  inset-inline-start: 0;
  width: 100%;
  background: rgba(255,255,255,.5);
  animation: scrollAnim 1.8s ease-in-out infinite;
}
@keyframes scrollAnim {
  0%   { top: -100%; height: 100%; }
  100% { top: 100%;  height: 100%; }
}

/* ============================
   コンセプト
============================ */
#concept {
  background: var(--off-white);
  padding-block: 120px;
}

.concept-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  max-width: 720px;
  margin-inline: auto;
}

.concept-label {
  font-family: var(--font-en);
  font-size: .7rem;
  font-weight: 600;
  letter-spacing: .2em;
  color: var(--g500);
  margin-block-end: 2.5rem;
  display: flex;
  align-items: center;
  gap: 1rem;
}
.concept-label::before {
  content: '';
  display: block;
  width: 32px;
  height: 1px;
  background: var(--g300);
}

.concept-headline {
  font-size: clamp(2.2rem, 5vw, 3.8rem);
  font-weight: 700;
  color: var(--black);
  line-height: 1.25;
  letter-spacing: -.03em;
  margin-block-end: 3.5rem;
}

.concept-body {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2rem;
  width: 100%;
}

.concept-lead {
  font-size: .95rem;
  font-weight: 400;
  color: var(--g700);
  line-height: 2;
}

.concept-text {
  font-size: clamp(1.5rem, 3.5vw, 2.4rem);
  font-weight: 700;
  color: var(--black);
  line-height: 1.4;
  letter-spacing: -.02em;
  padding-block: 2rem;
  border-block: 1px solid var(--g100);
  width: 100%;
}

.concept-closing {
  font-size: .9rem;
  color: var(--g700);
  line-height: 2.1;
  font-weight: 400;
}

/* ============================
   サービス
============================ */
#services {
  background: var(--black);
  padding-block: 120px;
}

.section-head { margin-block-end: 5rem; }

.section-label-en {
  font-family: var(--font-en);
  font-size: .7rem;
  font-weight: 600;
  letter-spacing: .2em;
  color: var(--g500);
  margin-block-end: 1.5rem;
  display: flex;
  align-items: center;
  gap: 1rem;
}
.section-label-en::before {
  content: '';
  display: block;
  width: 32px;
  height: 1px;
  background: var(--g500);
}

.section-title-dark {
  font-size: clamp(1.8rem, 3.5vw, 2.6rem);
  font-weight: 700;
  color: var(--white);
  line-height: 1.25;
  letter-spacing: -.02em;
}

.section-title-light {
  font-size: clamp(1.8rem, 3.5vw, 2.6rem);
  font-weight: 700;
  color: var(--black);
  line-height: 1.25;
  letter-spacing: -.02em;
}

.services-list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: rgba(255,255,255,.06);
}

.service-item {
  display: flex;
  flex-direction: column;
  padding: 2.5rem 2rem 2rem;
  background: var(--black);
  text-decoration: none;
  transition: background var(--tr);
  min-height: 320px;
}
.service-item:hover { background: #1a1a1a; }
.service-item:hover .service-num { color: rgba(26, 46, 90, .75); }
.service-item:hover .service-link { color: rgba(255,255,255,.7); }
.service-item:hover .service-link svg { transform: translateX(4px); }

.service-num {
  font-family: var(--font-en);
  font-size: clamp(4rem, 5vw, 5.5rem);
  font-weight: 900;
  color: rgba(26, 46, 90, .85);
  line-height: 1;
  letter-spacing: -.04em;
  margin-block-end: 2rem;
  transition: color var(--tr);
}

.service-body {
  flex: 1;
}
.service-body h3 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--white);
  margin-block-end: .875rem;
  letter-spacing: -.01em;
  line-height: 1.4;
}
.service-body p {
  font-size: .82rem;
  color: rgba(255,255,255,.8);
  line-height: 1.9;
  font-weight: 400;
}

.service-link {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  margin-block-start: 2rem;
  font-family: var(--font-en);
  font-size: .72rem;
  font-weight: 600;
  letter-spacing: .1em;
  color: rgba(255,255,255,.25);
  transition: color var(--tr);
}
.service-link svg { transition: transform var(--tr); }

/* ============================
   強み
============================ */
#strengths {
  background: var(--white);
  padding-block: 120px;
}

.strengths-head {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  align-items: end;
  margin-block-end: 4rem;
}

.strengths-lead {
  font-size: .92rem;
  color: var(--g500);
  line-height: 1.9;
  font-weight: 400;
  align-self: end;
  padding-block-end: .2rem;
}

.stats-block {
  background: var(--black);
  padding: 3.5rem;
}

.stats-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
  margin-block-end: 2.5rem;
}

.stat-cell {
  padding: 1.75rem;
  border-block-end: 1px solid rgba(255,255,255,.06);
  border-inline-end: 1px solid rgba(255,255,255,.06);
}
.stat-cell:nth-child(2n) { border-inline-end: none; }
.stat-cell:nth-last-child(-n+2) { border-block-end: none; }

.stat-num {
  font-family: var(--font-en);
  font-size: 2.8rem;
  font-weight: 700;
  color: var(--white);
  line-height: 1;
  margin-block-end: .5rem;
  letter-spacing: -.03em;
}
.stat-num sup { font-size: 1.2rem; font-weight: 400; color: var(--g300); }

.stat-lbl {
  font-size: .75rem;
  color: rgba(255,255,255,.55);
  letter-spacing: .05em;
}

.stats-badges {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
}
.badge-item {
  font-size: .72rem;
  color: var(--g300);
  border: 1px solid rgba(255,255,255,.1);
  padding: .3rem .85rem;
  letter-spacing: .03em;
}

.strengths-list {
  display: flex;
  flex-direction: column;
  margin-block-start: 3rem;
}

.strength-row {
  display: flex;
  gap: 2rem;
  padding-block: 1.75rem;
  border-block-end: 1px solid var(--g100);
  align-items: flex-start;
}
.strength-row:first-child { border-block-start: 1px solid var(--g100); }

.strength-idx {
  font-family: var(--font-en);
  font-size: .68rem;
  font-weight: 600;
  color: var(--g300);
  letter-spacing: .1em;
  flex-shrink: 0;
  padding-block-start: .3rem;
  width: 28px;
}

.strength-content h4 {
  font-size: .95rem;
  font-weight: 600;
  color: var(--black);
  margin-block-end: .4rem;
}
.strength-content p {
  font-size: .82rem;
  color: var(--g500);
  line-height: 1.8;
  font-weight: 400;
}

/* ============================
   コラム
============================ */
#column {
  background: var(--off-white);
  padding-block: 120px;
}

.column-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  margin-block-end: 3rem;
}

.column-more-link {
  display: inline-flex;
  align-items: center;
  gap: .45rem;
  font-family: var(--font-en);
  font-size: .72rem;
  font-weight: 600;
  letter-spacing: .1em;
  color: var(--g500);
  text-decoration: none;
  transition: color var(--tr);
  padding-block-end: .2rem;
}
.column-more-link:hover { color: var(--black); }
.column-more-link svg { transition: transform var(--tr); }
.column-more-link:hover svg { transform: translateX(3px); }

.column-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--g100);
  border: 1px solid var(--g100);
}

.column-loading {
  padding: 4rem;
  font-size: .85rem;
  color: var(--g500);
  font-weight: 400;
  grid-column: 1 / -1;
}

.idx-column-card {
  background: var(--white);
  padding: 2rem 1.75rem;
  display: flex;
  flex-direction: column;
  gap: .875rem;
  text-decoration: none;
  transition: background var(--tr);
}
.idx-column-card:hover { background: var(--off-white); }

.idx-column-date {
  font-family: var(--font-en);
  font-size: .68rem;
  font-weight: 400;
  color: var(--g500);
  letter-spacing: .06em;
}

.idx-column-title {
  font-size: .92rem;
  font-weight: 600;
  color: var(--black);
  line-height: 1.55;
  letter-spacing: -.01em;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.idx-column-excerpt {
  font-size: .78rem;
  color: var(--g500);
  line-height: 1.85;
  font-weight: 400;
  flex: 1;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* ============================
   CTA バナー
============================ */
#cta {
  background: var(--black);
  padding-block: 100px;
}

.cta-inner {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 3rem;
  flex-wrap: wrap;
  border-block-start: 1px solid rgba(255,255,255,.08);
  padding-block-start: 4rem;
}

.cta-title {
  font-size: clamp(1.6rem, 3.5vw, 2.4rem);
  font-weight: 700;
  color: var(--white);
  line-height: 1.3;
  letter-spacing: -.02em;
}

.cta-desc {
  font-size: .88rem;
  color: rgba(255,255,255,.8);
  line-height: 1.9;
  margin-block-start: 1rem;
  font-weight: 400;
}

.btn-cta {
  display: inline-flex;
  align-items: center;
  gap: .75rem;
  background: var(--white);
  color: var(--black);
  padding: 1rem 2.25rem;
  font-size: .88rem;
  font-weight: 600;
  flex-shrink: 0;
  letter-spacing: .03em;
  transition: background var(--tr), transform var(--tr);
}
.btn-cta:hover { background: var(--off-white); transform: translateY(-1px); }
.btn-cta svg { transition: transform var(--tr); }
.btn-cta:hover svg { transform: translateX(3px); }

/* ============================
   レスポンシブ
============================ */
@media (max-width: 960px) {
  .concept-inner { grid-template-columns: 1fr; gap: 4rem; }
  .strengths-head { grid-template-columns: 1fr; gap: 1rem; }
  .services-list { grid-template-columns: 1fr; }
  .column-grid { grid-template-columns: 1fr; }
  .service-item { min-height: auto; flex-direction: row; align-items: center; gap: 2rem; padding: 2rem; }
  .service-num { font-size: 3rem; margin-block-end: 0; flex-shrink: 0; width: 80px; }
  .service-link { margin-block-start: 1rem; }
}

@media (max-width: 768px) {
  #hero { padding-block-end: 60px; }
  .hero-scroll { display: none; }
  .stats-row { grid-template-columns: 1fr 1fr; }
  .cta-inner { flex-direction: column; align-items: flex-start; }
  #concept, #services, #strengths, #cta { padding-block: 60px; }
  .concept-headline { margin-block-end: 2rem; }
  .concept-body { gap: 1.25rem; }
  .service-item { flex-direction: column; align-items: flex-start; }
  .service-num { width: auto; }
}

@media (max-width: 480px) {
  .hero-actions { flex-direction: column; align-items: flex-start; }
  .service-num { font-size: 2.5rem; }
}