/* ================================================
   Manga Gallery — manga-gallery.css
   白基調・フラット・Noto Sans JP
   ================================================ */

@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+JP:wght@300;400;500;700&display=swap');

/* ---- Token System ---- */
:root {
  --bg:        #FAFAF8;
  --surface:   #FFFFFF;
  --border:    #E4E0DB;
  --border-lt: #F0EDE9;
  --text:      #1A1A1A;
  --muted:     #888880;
  --accent:    #C0392B;   /* 朱：唯一の色彩アクセント */
  --label:     #555550;
}

/* ---- Reset ---- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { font-size: 16px; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: 'Noto Sans JP', sans-serif;
  font-weight: 400;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }

/* ---- Site Header ---- */
.site-header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: 0 48px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: 50;
}

.site-logo {
  display: flex;
  align-items: center;
  gap: 9px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text);
  white-space: nowrap;
}

.logo-mark {
  flex-shrink: 0;
  width: 22px;
  height: 22px;
  background: var(--text);
  color: var(--surface);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0;
}

.site-logo span {
  color: var(--accent);
}

.header-nav {
  font-size: 11px;
  letter-spacing: 0.15em;
  color: var(--muted);
  text-transform: uppercase;
}

/* ---- Page Header ---- */
.page-header {
  padding: 64px 48px 48px;
  border-bottom: 1px solid var(--border);
}

.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--muted);
  text-transform: uppercase;
  margin-bottom: 24px;
}

.breadcrumb a {
  color: var(--muted);
  transition: color 0.15s;
}
.breadcrumb a:hover { color: var(--text); }
.breadcrumb-sep { color: var(--border); }

.page-title {
  font-size: clamp(28px, 5vw, 52px);
  font-weight: 700;
  letter-spacing: -0.01em;
  line-height: 1.1;
}

.page-meta {
  margin-top: 10px;
  font-size: 12px;
  font-weight: 300;
  letter-spacing: 0.08em;
  color: var(--muted);
}

/* ---- Grid ---- */
.grid-section {
  padding: 40px 48px 80px;
}

.grid-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: 28px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border-lt);
}

.grid-label {
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: var(--muted);
}

.grid-count {
  font-size: 11px;
  color: var(--muted);
}

.vol-grid {
  display: grid;
  /* grid-template-columns と gap はシリーズページ側で管理 */
}

/* ---- Volume Card ---- */
.vol-card {
  display: block;
  cursor: pointer;
  animation: fadeIn 0.35s both;
}
.vol-card:nth-child(n) { animation-delay: calc(var(--i,0) * 20ms); }

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: translateY(0); }
}

.vol-cover {
  position: relative;
  aspect-ratio: 2 / 3;
  background: var(--border-lt);
  border: 1px solid var(--border);
  overflow: hidden;
  transition: border-color 0.2s;
}

.vol-card:hover .vol-cover {
  border-color: var(--text);
}

.vol-cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  opacity: 0;
  transition: opacity 0.3s;
}
.vol-cover img.loaded { opacity: 1; }

.vol-info {
  margin-top: 8px;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
}

.vol-num {
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.06em;
  color: var(--label);
  transition: color 0.15s;
}
.vol-card:hover .vol-num { color: var(--text); }

/* ---- Current volume highlight (used on vol.html series grid) ---- */
.vol-card.current .vol-cover {
  border-color: var(--accent);
  border-width: 2px;
}
.vol-card.current .vol-num {
  color: var(--accent);
  font-weight: 700;
}
.vol-grid.view-lg .vol-card.current {
  border-color: var(--accent);
}
.vol-grid.view-lg .vol-card.current .vol-cover {
  border-width: 1px;
  border-right-width: 2px;
}

/* ---- Buy Button ---- */
.buy-btn,
.buy-btn:link,
.buy-btn:visited {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 13px 28px;
  background: var(--text);
  color: var(--surface);
  font-family: 'Noto Sans JP', sans-serif;
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.08em;
  border: none;
  cursor: pointer;
  transition: background 0.15s;
  text-decoration: none;
}
.buy-btn:hover,
.buy-btn:focus,
.buy-btn:active {
  background: #333;
  color: var(--surface);
}

.buy-btn-note {
  margin-top: 8px;
  font-size: 10px;
  letter-spacing: 0.06em;
  color: var(--muted);
}

/* ---- Nav Buttons ---- */
.vol-nav {
  display: flex;
  gap: 8px;
}

.nav-btn {
  padding: 9px 18px;
  border: 1px solid var(--border);
  font-size: 12px;
  font-weight: 400;
  letter-spacing: 0.06em;
  color: var(--muted);
  background: var(--surface);
  cursor: pointer;
  transition: border-color 0.15s, color 0.15s;
  text-decoration: none;
  display: inline-block;
}
.nav-btn:hover { border-color: var(--text); color: var(--text); }
.nav-btn.disabled { opacity: 0.25; pointer-events: none; }

/* ---- Footer ---- */
.site-footer {
  padding: 24px 48px;
  border-top: 1px solid var(--border);
  font-size: 10px;
  font-weight: 300;
  letter-spacing: 0.08em;
  color: var(--muted);
  line-height: 1.9;
}

/* ---- Responsive ---- */
@media (max-width: 640px) {
  .site-header { padding: 0 20px; }
  .site-logo { font-size: 10px; gap: 7px; }
  .logo-mark { width: 18px; height: 18px; font-size: 9px; }
  .page-header { padding: 36px 20px 32px; }
  .grid-section { padding: 28px 20px 60px; }
  .site-footer  { padding: 20px; }
}

@media (prefers-reduced-motion: reduce) {
  .vol-card { animation: none; }
}