/**
 * Shared site chrome for Algomatic Tech Blog 図解ギャラリー.
 * Tokens align with DESIGN-apple.md (Action Blue, flat surfaces).
 */

:root {
  --primary: #0066cc;
  --ink: #1d1d1f;
  --ink-muted: #333333;
  --muted: #7a7a7a;
  --hairline: #e0e0e0;
  --divider: #f0f0f0;
  --canvas: #ffffff;
  --parchment: #f5f5f7;
  --pearl: #fafafc;
  --font-display: "SF Pro Display", system-ui, -apple-system, BlinkMacSystemFont, "Inter", sans-serif;
  --font-text: "SF Pro Text", system-ui, -apple-system, BlinkMacSystemFont, "Inter", sans-serif;
}

.site-chrome-bar {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: saturate(180%) blur(16px);
  border-bottom: 1px solid var(--hairline);
}

.site-chrome-nav {
  background: rgba(255, 255, 255, 0.92);
}

.site-chrome-nav-inner {
  max-width: 980px;
  margin: 0 auto;
  padding: 12px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

.site-chrome-nav a {
  color: var(--primary);
  font-family: var(--font-text);
  font-size: 14px;
  line-height: 1.29;
  letter-spacing: -0.224px;
  text-decoration: none;
}

.site-chrome-nav a:hover {
  text-decoration: underline;
}

.site-chrome-footer {
  max-width: 980px;
  margin: 0 auto;
  padding: 32px 24px 48px;
  color: var(--muted);
  font-family: var(--font-text);
  font-size: 12px;
  line-height: 1.5;
  letter-spacing: -0.12px;
  text-align: center;
}

.site-chrome-footer p {
  margin: 0 0 8px;
  text-wrap: pretty;
}

.site-chrome-footer p:last-child {
  margin-bottom: 0;
}

.footer.site-chrome-footer {
  position: relative;
  isolation: isolate;
  border-top: none;
  background: transparent;
}

.footer.site-chrome-footer::before {
  content: "";
  position: absolute;
  z-index: -1;
  top: 0;
  bottom: 0;
  left: 50%;
  width: 100vw;
  transform: translateX(-50%);
  border-top: 1px solid var(--hairline);
  background: var(--parchment);
}

.page-index {
  margin: 0;
  background: var(--parchment);
  color: var(--ink);
  font-family: var(--font-text);
  -webkit-font-smoothing: antialiased;
  text-rendering: geometricPrecision;
}

.page-index a {
  color: var(--primary);
  text-decoration: none;
}

.page-index a:not(.gallery-card-cta):hover {
  text-decoration: underline;
}

.page-index a:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
  border-radius: 4px;
}

.page-index .tabular-nums {
  font-variant-numeric: tabular-nums;
}

/* —— Index top bar —— */

.gallery-topbar {
  background: rgba(245, 245, 247, 0.88);
}

.gallery-topbar-inner {
  max-width: 980px;
  margin: 0 auto;
  padding: 12px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.gallery-topbar-brand {
  font-family: var(--font-text);
  font-size: 12px;
  line-height: 1;
  letter-spacing: -0.12px;
  color: var(--ink);
  font-weight: 600;
}

.gallery-topbar-link {
  position: relative;
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  padding: 0 4px;
  font-size: 12px;
  line-height: 1;
  letter-spacing: -0.12px;
}

/* —— Hero —— */

.gallery-hero {
  text-align: center;
  padding: 56px 24px 64px;
  background: var(--canvas);
  border-bottom: 1px solid var(--divider);
}

.gallery-hero-inner {
  max-width: 820px;
  margin: 0 auto;
}

.gallery-kicker {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 18px;
  color: var(--primary);
  font-size: 17px;
  line-height: 1.47;
  letter-spacing: -0.374px;
  text-wrap: pretty;
}

.gallery-kicker-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--primary);
  flex-shrink: 0;
  transform: translateY(1px);
}

.gallery-hero h1 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(40px, 5vw, 56px);
  font-weight: 600;
  line-height: 1.07;
  letter-spacing: -0.28px;
  text-wrap: balance;
}

.gallery-lead {
  max-width: 640px;
  margin: 20px auto 0;
  font-family: var(--font-display);
  font-size: clamp(21px, 2.2vw, 28px);
  font-weight: 400;
  line-height: 1.25;
  letter-spacing: 0.196px;
  color: var(--ink-muted);
  text-wrap: pretty;
}

.gallery-stat {
  display: inline-block;
  margin: 28px 0 0;
  padding: 8px 14px;
  border-radius: 11px;
  background: var(--pearl);
  color: var(--ink-muted);
  font-size: 14px;
  font-weight: 600;
  line-height: 1.29;
  letter-spacing: -0.224px;
  font-variant-numeric: tabular-nums;
  box-shadow: 0 0 0 1px rgba(0, 0, 0, 0.04);
}

/* —— List —— */

.gallery-main {
  padding: 48px 24px 72px;
}

.gallery-list {
  max-width: 980px;
  margin: 0 auto;
  display: grid;
  gap: 16px;
}

.gallery-card {
  display: grid;
  gap: 20px;
  padding: 28px;
  border: 1px solid transparent;
  border-radius: 18px;
  background: var(--canvas);
  box-shadow:
    0 0 0 1px rgba(0, 0, 0, 0.06),
    0 1px 2px rgba(0, 0, 0, 0.04);
  transition-property: border-color, background-color, box-shadow;
  transition-duration: 0.2s;
  transition-timing-function: cubic-bezier(0.2, 0, 0, 1);
}

.gallery-card:hover {
  border-color: rgba(0, 102, 204, 0.35);
  background: var(--pearl);
  box-shadow:
    0 0 0 1px rgba(0, 102, 204, 0.2),
    0 4px 12px rgba(0, 0, 0, 0.06);
}

.gallery-card-meta {
  display: flex;
  align-items: flex-start;
}

.gallery-card-date {
  color: var(--muted);
  font-size: 14px;
  font-weight: 600;
  line-height: 1.29;
  letter-spacing: -0.224px;
  font-variant-numeric: tabular-nums;
}

.gallery-card-body {
  display: grid;
  gap: 12px;
}

.gallery-card h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(24px, 2.5vw, 34px);
  font-weight: 600;
  line-height: 1.14;
  letter-spacing: -0.28px;
  text-wrap: balance;
}

.gallery-card h2 a {
  color: inherit;
  text-decoration: none;
}

.gallery-card h2 a:hover {
  color: var(--primary);
  text-decoration: none;
}

.gallery-card-lead {
  margin: 0;
  max-width: 72ch;
  color: var(--ink-muted);
  font-size: 17px;
  line-height: 1.47;
  letter-spacing: -0.374px;
  text-wrap: pretty;
}

.gallery-card-foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  padding-top: 8px;
  border-top: 1px solid var(--divider);
}

.gallery-card-source {
  margin: 0;
  font-size: 14px;
  line-height: 1.43;
  letter-spacing: -0.224px;
  color: var(--muted);
  text-wrap: pretty;
}

.gallery-card-source a {
  color: var(--primary);
}

.gallery-card-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 40px;
  padding: 11px 22px;
  border: 1px solid var(--primary);
  border-radius: 9999px;
  background: var(--canvas);
  color: var(--primary);
  font-size: 17px;
  font-weight: 400;
  line-height: 1;
  letter-spacing: -0.374px;
  text-decoration: none;
  white-space: nowrap;
  transition-property: background-color, color, transform;
  transition-duration: 0.2s;
  transition-timing-function: cubic-bezier(0.2, 0, 0, 1);
}

.gallery-card-cta:hover {
  background: var(--primary);
  color: var(--canvas);
  text-decoration: none;
}

.gallery-card-cta:active {
  transform: scale(0.96);
}

@media (prefers-reduced-motion: no-preference) {
  .gallery-card {
    animation: gallery-card-enter 0.45s cubic-bezier(0.2, 0, 0, 1) both;
  }

  .gallery-card:nth-child(1) { animation-delay: 0ms; }
  .gallery-card:nth-child(2) { animation-delay: 70ms; }
  .gallery-card:nth-child(3) { animation-delay: 140ms; }
  .gallery-card:nth-child(4) { animation-delay: 210ms; }
  .gallery-card:nth-child(5) { animation-delay: 280ms; }
  .gallery-card:nth-child(6) { animation-delay: 350ms; }
  .gallery-card:nth-child(7) { animation-delay: 420ms; }
  .gallery-card:nth-child(8) { animation-delay: 490ms; }
  .gallery-card:nth-child(9) { animation-delay: 560ms; }
}

@keyframes gallery-card-enter {
  from {
    opacity: 0;
    transform: translateY(8px);
  }

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

@media (min-width: 768px) {
  .gallery-card {
    grid-template-columns: 148px minmax(0, 1fr);
    align-items: start;
    gap: 32px;
    padding: 32px;
  }

  .gallery-card-meta {
    flex-direction: column;
    align-items: flex-start;
    justify-content: flex-start;
    gap: 10px;
  }

  .gallery-card-foot {
    margin-top: 4px;
  }
}