/* =========================================================
   Blog — Shared styles (article + index)
   Loaded after style.css. Variables / fonts are inherited.
   ========================================================= */

/* ---------- Article layout ---------- */
.blog {
  padding: 140px 0 80px;
}
.blog__head {
  margin-bottom: 56px;
  padding-bottom: 32px;
  border-bottom: 1px solid var(--border);
}
.blog__back {
  display: inline-block;
  font-size: 0.85rem;
  color: var(--text-mute);
  margin-bottom: 24px;
  transition: color var(--t-fast);
}
.blog__back:hover { color: var(--text); }

.blog__cat {
  display: inline-block;
  padding: 4px 12px;
  background: var(--highlight-soft);
  color: var(--highlight-deep);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  border-radius: 100px;
  margin-bottom: 16px;
  font-family: var(--font-en);
  text-transform: uppercase;
}

.blog__title {
  font-size: clamp(1.7rem, 4vw, 2.6rem);
  font-weight: 700;
  letter-spacing: -0.01em;
  line-height: 1.45;
  margin-bottom: 20px;
}
.blog__title em {
  font-style: normal;
  background: linear-gradient(transparent 62%, var(--highlight-soft) 62%);
  padding: 0 4px;
}

.blog__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 0.78rem;
  color: var(--text-dim);
  font-family: var(--font-en);
  letter-spacing: 0.05em;
}
.blog__meta time { font-weight: 500; }

.blog__lead {
  margin: 32px 0 56px;
  padding: 24px;
  background: var(--bg-alt);
  border-left: 3px solid var(--highlight);
  border-radius: 0 var(--r-sm) var(--r-sm) 0;
  font-size: 0.95rem;
  line-height: 1.95;
  color: var(--text);
}

.blog__sec { margin-bottom: 56px; }
.blog__sec h2 {
  font-size: clamp(1.25rem, 2.6vw, 1.55rem);
  font-weight: 700;
  margin: 48px 0 20px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border);
  letter-spacing: -0.005em;
}
.blog__sec h2 .num {
  display: inline-block;
  font-family: var(--font-en);
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--highlight);
  margin-right: 12px;
  letter-spacing: 0.1em;
  vertical-align: 0.25em;
}
.blog__sec h3 {
  font-size: 1.05rem;
  font-weight: 700;
  margin: 32px 0 12px;
}
.blog__sec p {
  font-size: 0.95rem;
  line-height: 2;
  color: var(--text-mute);
  margin-bottom: 16px;
}
.blog__sec p b, .blog__sec p strong { color: var(--text); font-weight: 700; }
.blog__sec ul {
  margin: 16px 0 24px;
  padding-left: 0;
}
.blog__sec li {
  position: relative;
  padding-left: 22px;
  margin-bottom: 8px;
  font-size: 0.92rem;
  line-height: 1.9;
  color: var(--text-mute);
}
.blog__sec li::before {
  content: '';
  position: absolute;
  left: 0; top: 0.85em;
  width: 12px; height: 1px;
  background: var(--highlight);
}

.blog__quote {
  margin: 32px 0;
  padding: 20px 24px;
  border-left: 2px solid var(--text-dim);
  font-style: italic;
  color: var(--text-mute);
  font-size: 0.95rem;
}

/* ---------- Figure (SVG container) ---------- */
.blog__fig {
  margin: 36px 0;
  padding: 32px 24px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
}
.blog__fig svg { width: 100%; height: auto; display: block; margin: 0 auto; }
.blog__figcap {
  margin-top: 16px;
  font-size: 0.78rem;
  color: var(--text-dim);
  text-align: center;
  letter-spacing: 0.04em;
}

/* ---------- Article CTA banner ---------- */
.blog__cta {
  margin-top: 64px;
  padding: 40px 28px;
  background: var(--text);
  color: var(--bg);
  border-radius: var(--r-md);
  text-align: center;
}
.blog__cta h3 {
  font-size: clamp(1.1rem, 2.4vw, 1.35rem);
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--bg);
}
.blog__cta p {
  font-size: 0.88rem;
  color: rgba(250,250,250,0.75);
  margin-bottom: 24px;
}
.blog__cta-btn {
  display: inline-block;
  padding: 14px 32px;
  background: var(--highlight);
  color: #fff;
  border-radius: 100px;
  font-size: 0.92rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  transition: background var(--t-fast), transform var(--t-fast);
}
.blog__cta-btn:hover { background: var(--highlight-deep); transform: translateY(-2px); }

/* =========================================================
   Blog Index (listing page)
   ========================================================= */
.blogIndex {
  padding: 140px 0 100px;
}
.blogIndex__hero {
  margin-bottom: 64px;
  padding-bottom: 40px;
  border-bottom: 1px solid var(--border);
  position: relative;
}
.blogIndex__back {
  display: inline-block;
  font-size: 0.85rem;
  color: var(--text-mute);
  margin-bottom: 24px;
  transition: color var(--t-fast);
}
.blogIndex__back:hover { color: var(--text); }

.blogIndex__title-en {
  display: block;
  font-family: var(--font-en);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.2em;
  color: var(--highlight);
  margin-bottom: 12px;
  text-transform: uppercase;
}
.blogIndex__title {
  font-size: clamp(1.8rem, 4.5vw, 2.8rem);
  font-weight: 700;
  letter-spacing: -0.01em;
  line-height: 1.4;
  margin-bottom: 16px;
}
.blogIndex__lead {
  font-size: 0.95rem;
  color: var(--text-mute);
  line-height: 1.95;
  max-width: 640px;
}

/* ---------- Article cards ---------- */
.blogIndex__list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}
@media (min-width: 720px) {
  .blogIndex__list { grid-template-columns: repeat(2, 1fr); }
}

.blogCard {
  position: relative;
  display: flex;
  flex-direction: column;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  overflow: hidden;
  text-decoration: none;
  color: inherit;
  transition: transform var(--t-fast), border-color var(--t-fast), box-shadow var(--t-fast);
}
.blogCard:hover {
  transform: translateY(-3px);
  border-color: var(--highlight);
  box-shadow: 0 12px 28px -16px rgba(249,115,22,0.35);
}
.blogCard__visual {
  position: relative;
  height: 160px;
  background: var(--bg-alt);
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}
.blogCard__visual svg {
  width: 100%; height: 100%;
  display: block;
}
.blogCard__body {
  padding: 24px 22px 28px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  flex: 1;
}
.blogCard__cat {
  display: inline-block;
  align-self: flex-start;
  padding: 3px 10px;
  background: var(--highlight-soft);
  color: var(--highlight-deep);
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  border-radius: 100px;
  font-family: var(--font-en);
  text-transform: uppercase;
}
.blogCard__title {
  font-size: 1.05rem;
  font-weight: 700;
  line-height: 1.55;
  letter-spacing: -0.005em;
  color: var(--text);
}
.blogCard__excerpt {
  font-size: 0.85rem;
  line-height: 1.85;
  color: var(--text-mute);
  margin-bottom: auto;
}
.blogCard__meta {
  display: flex;
  align-items: center;
  gap: 14px;
  font-family: var(--font-en);
  font-size: 0.72rem;
  color: var(--text-dim);
  letter-spacing: 0.05em;
  padding-top: 12px;
  border-top: 1px solid var(--border);
}
.blogCard__arrow {
  margin-left: auto;
  transition: transform var(--t-fast);
}
.blogCard:hover .blogCard__arrow { transform: translateX(4px); color: var(--highlight); }

/* ---------- Coming soon (placeholder card) ---------- */
.blogCard--soon {
  pointer-events: none;
  opacity: 0.55;
  border-style: dashed;
}
.blogCard--soon .blogCard__visual { background: transparent; }
.blogCard--soon .blogCard__visual::after {
  content: 'COMING SOON';
  position: absolute;
  font-family: var(--font-en);
  font-size: 0.78rem;
  letter-spacing: 0.25em;
  color: var(--text-dim);
}

/* =========================================================
   Card visual animations (used in /blog/index.html)
   ========================================================= */
.cardviz-orbit .ring {
  fill: none;
  stroke: var(--text);
  stroke-width: 1;
  transform-origin: center;
  animation: cardSpin 14s linear infinite;
}
.cardviz-orbit .ring-inner { stroke: var(--highlight); animation-duration: 9s; animation-direction: reverse; }
.cardviz-orbit .dot {
  fill: var(--highlight);
  animation: cardPulse 2.4s ease-in-out infinite;
}

.cardviz-flip .card-a, .cardviz-flip .card-b {
  stroke: var(--text);
  stroke-width: 1.3;
  fill: var(--surface);
}
.cardviz-flip .card-b { fill: var(--highlight); stroke: var(--highlight-deep); }
.cardviz-flip .mark-x { stroke: var(--text-dim); stroke-width: 1.6; stroke-linecap: round; }
.cardviz-flip .mark-o {
  stroke: var(--bg);
  stroke-width: 1.8;
  fill: none;
  stroke-dasharray: 40;
  animation: cardCircle 2.2s ease-in-out infinite;
}

.cardviz-spark .spark {
  stroke: var(--highlight);
  stroke-width: 1.4;
  stroke-linecap: round;
  transform-origin: center;
  animation: sparkPulse 2.4s ease-in-out infinite;
}
.cardviz-spark .spark-2 { animation-delay: 0.3s; }
.cardviz-spark .spark-3 { animation-delay: 0.6s; }
.cardviz-spark .spark-4 { animation-delay: 0.9s; }
.cardviz-spark .core-circle {
  fill: var(--text);
  animation: cardPulse 2s ease-in-out infinite;
}

@keyframes cardSpin { to { transform: rotate(360deg); } }
@keyframes cardPulse {
  0%, 100% { opacity: 1; transform: scale(1); transform-origin: center; }
  50% { opacity: 0.5; transform: scale(1.15); }
}
@keyframes cardCircle {
  0% { stroke-dashoffset: 40; }
  50% { stroke-dashoffset: 0; }
  100% { stroke-dashoffset: -40; }
}
@keyframes sparkPulse {
  0%, 100% { opacity: 0.3; stroke-width: 1; }
  50% { opacity: 1; stroke-width: 2; }
}

@media (prefers-reduced-motion: reduce) {
  .cardviz-orbit .ring,
  .cardviz-orbit .dot,
  .cardviz-flip .mark-o,
  .cardviz-spark .spark,
  .cardviz-spark .core-circle {
    animation: none !important;
  }
}