/* =============================================
   INDEX page — dark theme redesign 2025
   ============================================= */

:root {
  --idx-bg:        #0B1622;
  --idx-bg2:       #0F2032;
  --idx-bg3:       #14283D;
  --idx-gold:      #C6A15B;
  --idx-text:      #F3EFE6;
  --idx-muted:     #8FA6BE;
  --idx-dim:       #5F7791;
  --idx-line:      rgba(255,255,255,0.08);
  --idx-line-gold: rgba(198,161,91,0.22);
  --font-mono:     'Space Mono', monospace;
}

/* ========== SHARED ========== */
.idx-sec-en {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: var(--idx-gold);
  margin-bottom: 16px;
}

/* ========== HERO ========== */
.idx-hero {
  position: relative;
  background: var(--idx-bg);
  min-height: 100vh;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.idx-orbit {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: min(900px, 110vw);
  height: min(900px, 110vw);
  pointer-events: none;
  animation: idx-orbit-spin 120s linear infinite;
}
@keyframes idx-orbit-spin {
  from { transform: translate(-50%, -50%) rotate(0deg); }
  to   { transform: translate(-50%, -50%) rotate(360deg); }
}

.idx-hero-inner {
  position: relative;
  z-index: 2;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 clamp(20px, 4vw, 60px);
  width: 100%;
  flex: 1;
  display: flex;
  flex-direction: column;
  box-sizing: border-box;
}

/* Meta bar */
.idx-meta-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: clamp(20px, 3vw, 32px) 0 16px;
  border-bottom: 1px solid var(--idx-line);
}
.idx-site-tag,
.idx-last-updated {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.12em;
  color: var(--idx-dim);
  text-transform: uppercase;
}

/* 3-column hero grid */
.idx-hero-grid {
  display: grid;
  grid-template-columns: 1fr 1.1fr 1fr;
  gap: clamp(24px, 3vw, 48px);
  flex: 1;
  padding: clamp(36px, 5vw, 72px) 0 clamp(24px, 3vw, 40px);
  align-items: start;
}

/* Column labels */
.idx-col-en-label {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--idx-gold);
  margin-bottom: 6px;
}
.idx-col-jp {
  font-family: var(--font-display-jp);
  font-size: clamp(12px, 1.1vw, 14px);
  color: var(--idx-muted);
  margin-bottom: clamp(20px, 2.5vw, 32px);
  letter-spacing: 0.05em;
  line-height: 1.6;
}

/* Timeline */
.idx-timeline {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 0;
}
.idx-tl-item {
  display: flex;
  flex-direction: column;
  gap: 5px;
  padding: 12px 0;
  border-bottom: 1px solid var(--idx-line);
}
.idx-tl-item:first-child { padding-top: 0; }
.idx-tl-item:last-child { border-bottom: none; }

.idx-tl-era {
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--idx-dim);
}
.idx-tl-era.idx-era-gold {
  color: var(--idx-gold);
}
.idx-tl-text {
  font-family: var(--font-display-jp);
  font-size: clamp(12px, 1.1vw, 14px);
  color: var(--idx-text);
  line-height: 1.6;
  letter-spacing: 0.03em;
}
.idx-tl-dim .idx-tl-text {
  color: var(--idx-muted);
}

/* Chips */
.idx-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: clamp(16px, 2vw, 24px);
}
.idx-chip {
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.08em;
  padding: 4px 10px;
  border: 1px solid var(--idx-line-gold);
  color: var(--idx-gold);
  white-space: nowrap;
}

/* CENTER column */
.idx-center {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: clamp(18px, 2.5vw, 28px);
}
.idx-center-top {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
}
.idx-center-tag {
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--idx-muted);
}
.idx-center-quote {
  font-family: var(--font-display-jp);
  font-size: clamp(15px, 1.7vw, 21px);
  color: var(--idx-text);
  line-height: 1.9;
  letter-spacing: 0.05em;
  margin: 0;
}
.idx-center-sub {
  font-family: var(--font-display-jp);
  font-size: clamp(11px, 1vw, 13px);
  color: var(--idx-muted);
  letter-spacing: 0.08em;
  margin: 0;
}

/* Portrait ring */
.idx-portrait-ring {
  width: clamp(160px, 18vw, 240px);
  height: clamp(160px, 18vw, 240px);
  border-radius: 50%;
  border: 1px solid var(--idx-line-gold);
  padding: 5px;
  position: relative;
  flex-shrink: 0;
}
.idx-portrait-ring::before {
  content: '';
  position: absolute;
  inset: -10px;
  border-radius: 50%;
  border: 1px dashed rgba(198,161,91,0.2);
  animation: idx-ring-spin 30s linear infinite;
}
@keyframes idx-ring-spin {
  from { transform: rotate(0deg); }
  to   { transform: rotate(360deg); }
}
.idx-portrait-ring picture { display: block; width: 100%; height: 100%; border-radius: 50%; overflow: hidden; }
.idx-portrait-ring img {
  width: 100%;
  height: 100%;
  border-radius: 50%;
  object-fit: cover;
  object-position: center top;
  display: block;
}

/* Name block */
.idx-name-block {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
}
.idx-name {
  font-family: var(--font-display-jp);
  font-size: clamp(24px, 2.8vw, 36px);
  font-weight: 700;
  color: var(--idx-text);
  letter-spacing: 0.12em;
  margin: 0;
  line-height: 1.2;
}
.idx-name-mono {
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.18em;
  color: var(--idx-dim);
  text-transform: uppercase;
}
.idx-name-role {
  font-family: var(--font-display-en);
  font-size: clamp(12px, 1.1vw, 14px);
  color: var(--idx-gold);
  letter-spacing: 0.05em;
}

/* FUTURE (right) column */
.idx-future {
  display: flex;
  flex-direction: column;
}
.idx-future-lead {
  font-family: var(--font-display-jp);
  font-size: clamp(13px, 1.2vw, 15px);
  color: var(--idx-muted);
  line-height: 2.0;
  letter-spacing: 0.05em;
  margin: 0 0 clamp(18px, 2.5vw, 28px) 0;
}

/* Info bar */
.idx-info-bar {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border-top: 1px solid var(--idx-line);
  border-bottom: 1px solid var(--idx-line);
  margin-bottom: clamp(20px, 3vw, 32px);
}
.idx-info-item {
  padding: clamp(14px, 2vw, 22px) clamp(10px, 1.5vw, 20px);
  border-right: 1px solid var(--idx-line);
}
.idx-info-item:last-child { border-right: none; }
.idx-info-label {
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--idx-gold);
  margin-bottom: 8px;
}
.idx-info-text {
  font-family: var(--font-display-jp);
  font-size: clamp(10px, 0.9vw, 12px);
  color: var(--idx-muted);
  line-height: 1.8;
  letter-spacing: 0.03em;
}

/* Scroll hint */
.idx-scroll-hint {
  position: absolute;
  bottom: clamp(20px, 3vw, 32px);
  left: 50%;
  transform: translateX(-50%);
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.25em;
  color: var(--idx-dim);
  animation: idx-scroll-bounce 2.5s ease-in-out infinite;
  white-space: nowrap;
}
@keyframes idx-scroll-bounce {
  0%, 100% { transform: translateX(-50%) translateY(0); opacity: 0.6; }
  50%       { transform: translateX(-50%) translateY(7px); opacity: 1; }
}

/* ========== ORCHESTRATOR ========== */
.idx-orch {
  background: var(--idx-bg2);
  padding: clamp(80px, 11vw, 140px) clamp(20px, 4vw, 60px);
}
.idx-orch-inner {
  max-width: 960px;
  margin: 0 auto;
}
.idx-orch-scene {
  margin: clamp(28px, 4vw, 48px) 0;
  border-radius: 2px;
  overflow: hidden;
}
.idx-orch-title {
  font-family: var(--font-display-jp);
  font-size: clamp(20px, 2.8vw, 34px);
  font-weight: 700;
  color: var(--idx-text);
  line-height: 1.65;
  letter-spacing: 0.05em;
  margin: 0 0 clamp(18px, 2.5vw, 28px) 0;
}
.idx-orch-lead {
  font-family: var(--font-display-jp);
  font-size: clamp(14px, 1.3vw, 16px);
  color: var(--idx-muted);
  line-height: 2.0;
  letter-spacing: 0.04em;
  margin: 0 0 clamp(40px, 6vw, 72px) 0;
}
.idx-orch-lead strong {
  color: var(--idx-text);
  font-weight: 600;
}

/* Flow visualization */
.idx-orch-flow {
  display: flex;
  align-items: center;
  gap: clamp(16px, 2.5vw, 32px);
  margin-bottom: clamp(50px, 7vw, 88px);
  padding: clamp(22px, 3vw, 40px) clamp(24px, 4vw, 48px);
  background: rgba(255,255,255,0.025);
  border: 1px solid var(--idx-line);
}
.idx-flow-box {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.idx-flow-lbl {
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.25em;
  color: var(--idx-dim);
  text-transform: uppercase;
}
.idx-flow-txt {
  font-family: var(--font-display-jp);
  font-size: clamp(14px, 1.4vw, 18px);
  color: var(--idx-muted);
  line-height: 1.7;
  letter-spacing: 0.04em;
}
.idx-flow-box--after .idx-flow-txt {
  color: var(--idx-text);
}
.idx-flow-mid {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  flex-shrink: 0;
}
.idx-flow-mid-en {
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.2em;
  color: var(--idx-gold);
  text-transform: uppercase;
}
.idx-flow-arrow {
  font-size: 22px;
  color: var(--idx-gold);
  line-height: 1;
}
.idx-flow-mid-sub {
  font-family: var(--font-display-jp);
  font-size: 11px;
  color: var(--idx-dim);
  letter-spacing: 0.05em;
}

/* Bullets grid */
.idx-orch-bullets {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: clamp(20px, 3vw, 40px);
}
.idx-bullet {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding-top: clamp(18px, 2.5vw, 28px);
  border-top: 1px solid var(--idx-line);
}
.idx-bullet-num {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.1em;
  color: var(--idx-gold);
}
.idx-bullet h3 {
  font-family: var(--font-display-jp);
  font-size: clamp(14px, 1.3vw, 17px);
  font-weight: 700;
  color: var(--idx-text);
  line-height: 1.55;
  letter-spacing: 0.04em;
  margin: 0;
}
.idx-bullet p {
  font-family: var(--font-display-jp);
  font-size: clamp(12px, 1vw, 14px);
  color: var(--idx-muted);
  line-height: 1.9;
  letter-spacing: 0.04em;
  margin: 0;
}

/* ========== PORTFOLIO ========== */
.idx-port {
  background: var(--idx-bg3);
  padding: clamp(80px, 11vw, 140px) clamp(20px, 4vw, 60px);
}
.idx-port-inner {
  max-width: 960px;
  margin: 0 auto;
}
.idx-port-title {
  font-family: var(--font-display-jp);
  font-size: clamp(22px, 2.8vw, 36px);
  font-weight: 700;
  color: var(--idx-text);
  letter-spacing: 0.05em;
  margin: 0 0 clamp(36px, 5vw, 60px) 0;
}
.idx-port-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
}
.idx-port-item {
  border-top: 1px solid var(--idx-line);
}
.idx-port-item:last-child {
  border-bottom: 1px solid var(--idx-line);
}
.idx-port-link {
  display: flex;
  align-items: flex-start;
  gap: clamp(20px, 3vw, 40px);
  padding: clamp(22px, 3vw, 40px) 0;
  text-decoration: none;
  transition: opacity 0.3s ease;
}
.idx-port-link:hover {
  opacity: 0.7;
}
.idx-port-num {
  font-family: var(--font-mono);
  font-size: clamp(26px, 3vw, 44px);
  color: var(--idx-line-gold);
  line-height: 1;
  flex-shrink: 0;
  min-width: clamp(46px, 4.5vw, 64px);
  letter-spacing: -0.02em;
}
.idx-port-body {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.idx-port-name {
  font-family: var(--font-display-jp);
  font-size: clamp(15px, 1.6vw, 20px);
  font-weight: 700;
  color: var(--idx-text);
  letter-spacing: 0.05em;
  line-height: 1.4;
}
.idx-port-sub {
  font-family: var(--font-display-jp);
  font-size: clamp(10px, 0.9vw, 12px);
  color: var(--idx-muted);
  font-weight: 400;
  margin-left: 8px;
}
.idx-port-desc {
  font-family: var(--font-display-jp);
  font-size: clamp(12px, 1.1vw, 14px);
  color: var(--idx-muted);
  line-height: 1.9;
  letter-spacing: 0.04em;
  margin: 0;
}

/* ========== CONTACT ========== */
.idx-contact {
  background: var(--idx-bg);
  padding: clamp(100px, 14vw, 180px) clamp(20px, 4vw, 60px);
  text-align: center;
  border-top: 1px solid var(--idx-line);
}
.idx-contact-inner {
  max-width: 640px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: clamp(22px, 3vw, 34px);
}
.idx-contact-title {
  font-family: var(--font-display-jp);
  font-size: clamp(26px, 3.5vw, 48px);
  font-weight: 700;
  color: var(--idx-text);
  line-height: 1.55;
  letter-spacing: 0.05em;
  margin: 0;
}
.idx-contact-cta {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.22em;
  color: var(--idx-bg);
  background: var(--idx-gold);
  padding: 16px 44px;
  text-decoration: none;
  transition: opacity 0.3s ease, transform 0.3s ease;
}
.idx-contact-cta:hover {
  opacity: 0.85;
  transform: translateY(-2px);
}
.idx-contact-foot {
  font-family: var(--font-display-jp);
  font-size: 12px;
  color: var(--idx-dim);
  line-height: 1.9;
  letter-spacing: 0.04em;
}

/* ========== LINK OVERRIDES ========== */
a.idx-chip {
  text-decoration: none;
  color: var(--idx-gold);
  transition: opacity 0.2s ease;
}
a.idx-chip:hover { opacity: 0.7; }

a.idx-center-tag {
  text-decoration: none;
  color: var(--idx-muted);
  display: inline-block;
  transition: color 0.2s ease;
}
a.idx-center-tag:hover { color: var(--idx-gold); }

a.idx-portrait-ring {
  display: block;
  cursor: pointer;
}

.idx-tl-text a {
  color: inherit;
  text-decoration: none;
  transition: color 0.2s ease;
}
.idx-tl-text a:hover { color: var(--idx-gold); }

.idx-info-text a {
  color: inherit;
  text-decoration: none;
  border-bottom: 1px solid rgba(198,161,91,0.3);
  transition: color 0.2s ease, border-color 0.2s ease;
}
.idx-info-text a:hover { color: var(--idx-gold); border-color: var(--idx-gold); }

.idx-ext-link {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.1em;
  color: var(--idx-muted);
  text-decoration: none;
  padding: 0 0 clamp(14px, 2vw, 24px) 0;
  transition: color 0.2s ease;
}
.idx-ext-link:hover { color: var(--idx-gold); }

.idx-orch-cta-row {
  margin-top: clamp(36px, 5vw, 56px);
  text-align: center;
}
.idx-orch-cta {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.18em;
  color: var(--idx-gold);
  text-decoration: none;
  border: 1px solid var(--idx-line-gold);
  padding: 12px 36px;
  transition: background 0.25s ease, color 0.25s ease;
}
.idx-orch-cta:hover {
  background: var(--idx-gold);
  color: var(--idx-bg);
}

.idx-contact-foot a {
  color: inherit;
  text-decoration: none;
  border-bottom: 1px solid rgba(255,255,255,0.15);
  transition: color 0.2s ease, border-color 0.2s ease;
}
.idx-contact-foot a:hover { color: var(--idx-gold); border-color: var(--idx-gold); }

/* ========== RESPONSIVE ========== */
@media (max-width: 1000px) {
  .idx-hero-grid {
    grid-template-columns: 1fr 1fr;
  }
  .idx-history { order: 2; }
  .idx-center  { order: 1; grid-column: 1 / -1; }
  .idx-future  { order: 3; grid-column: 1 / -1; }
}

@media (max-width: 640px) {
  .idx-hero-grid {
    grid-template-columns: 1fr;
  }
  .idx-history { order: 2; grid-column: auto; }
  .idx-center  { order: 1; grid-column: auto; }
  .idx-future  { order: 3; grid-column: auto; }

  .idx-meta-bar { flex-direction: column; align-items: flex-start; gap: 6px; }

  .idx-info-bar { grid-template-columns: 1fr; }
  .idx-info-item { border-right: none; border-bottom: 1px solid var(--idx-line); }
  .idx-info-item:last-child { border-bottom: none; }

  .idx-orch-bullets { grid-template-columns: 1fr; }

  .idx-orch-flow {
    flex-direction: column;
    align-items: stretch;
    gap: 20px;
  }
  .idx-flow-mid {
    flex-direction: row;
    align-items: center;
    justify-content: center;
    gap: 12px;
  }
  .idx-flow-arrow { font-size: 18px; }
}