/* ============================================================
   Blog page styles — テック系デザイン
   ============================================================ */

.page-hero {
  padding-top: calc(var(--nav-height) + var(--space-4xl));
  padding-bottom: var(--space-4xl);
  background: var(--color-bg-dark);
  border-bottom: 1px solid rgba(99,102,241,0.12);
  position: relative;
  overflow: hidden;
}

.page-hero::before {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 60%;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--color-primary), transparent);
}

.page-hero__content {
  text-align: center;
}

.page-hero__title {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-top: var(--space-sm);
  background: linear-gradient(135deg, var(--color-white), var(--color-gray-200));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.page-hero__desc {
  margin-top: var(--space-base);
  font-size: 1rem;
  color: rgba(255,255,255,0.52);
  line-height: 1.8;
  max-width: 560px;
  margin-inline: auto;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
  border: 0;
}

.blog-filter {
  display: flex;
  gap: var(--space-sm);
  flex-wrap: wrap;
  margin-bottom: var(--space-2xl);
}

.blog-filter__btn {
  background: rgba(30,41,59,0.8);
  border: 1px solid rgba(99,102,241,0.15);
  color: rgba(255,255,255,0.5);
  font-size: 0.82rem;
  font-weight: 600;
  padding: var(--space-sm) var(--space-base);
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all var(--transition-fast);
  font-family: var(--font-mono);
  min-height: 36px;
}

.blog-filter__btn:hover {
  border-color: rgba(99,102,241,0.4);
  color: rgba(255,255,255,0.85);
}

.blog-filter__btn.is-active {
  background: rgba(99,102,241,0.15);
  border-color: var(--color-primary);
  color: var(--color-primary-light);
}

.blog-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-lg);
}

.blog-card {
  background: var(--color-bg-card);
  border: 1px solid rgba(99,102,241,0.1);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: border-color var(--transition-base), transform var(--transition-base), box-shadow var(--transition-base);
  cursor: pointer;
  position: relative;
}

.blog-card::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
  transform: scaleX(0);
  transition: transform var(--transition-base);
  transform-origin: left;
}

.blog-card:hover {
  border-color: rgba(99,102,241,0.3);
  transform: translateY(-4px);
  box-shadow: var(--shadow-md), var(--glow-primary);
}

.blog-card:hover::after {
  transform: scaleX(1);
}

.blog-card__inner {
  padding: var(--space-xl);
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  height: 100%;
}

.blog-card__meta {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  flex-wrap: wrap;
}

.blog-card__date {
  font-size: 0.72rem;
  color: rgba(255,255,255,0.35);
  font-weight: 500;
  font-family: var(--font-mono);
}

.blog-card__category {
  font-size: 0.68rem;
  font-weight: 700;
  color: var(--color-accent-light);
  background: rgba(6,182,212,0.08);
  border: 1px solid rgba(6,182,212,0.2);
  padding: 2px 8px;
  border-radius: var(--radius-full);
  font-family: var(--font-mono);
}

.blog-card__title {
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--color-white);
  line-height: 1.5;
}

.blog-card__excerpt {
  font-size: 0.875rem;
  color: rgba(255,255,255,0.5);
  line-height: 1.78;
  flex: 1;
}

.blog-card__footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: var(--space-base);
  border-top: 1px solid rgba(99,102,241,0.08);
  margin-top: auto;
}

.blog-card__author {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  font-size: 0.78rem;
  color: rgba(255,255,255,0.35);
  font-family: var(--font-mono);
}

.blog-card__read-more {
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--color-primary-light);
  transition: color var(--transition-fast);
  font-family: var(--font-mono);
}

.blog-card:hover .blog-card__read-more {
  color: var(--color-accent-light);
}

@media (max-width: 768px) {
  .blog-list {
    grid-template-columns: 1fr;
  }
}