/* =====================================================================
 * index.css — Polyphase listing pages (essays index / series index / series)
 *
 * Reference: site-spec v0.4 §4.3, mock-essays-jp.html (concept).
 * Scoped under `.page--essays-index`, `.page--series-index`, `.page--series`
 * to avoid colliding with top.html's unscoped `.essays` / `.series` blocks
 * in base.css.
 *
 * Tone: magazine TOC. Text-driven, no thumbnails. Latest first.
 * ===================================================================== */

/* ---------------------------------------------------------------------
 * Shared shell
 * ------------------------------------------------------------------- */
.page--essays-index,
.page--series-index,
.page--series {
  background: var(--bg);
  color: var(--text);
}
.page--essays-index section,
.page--series-index section,
.page--series section {
  position: relative;
}
.page--essays-index .section-label,
.page--series-index .section-label,
.page--series .section-label {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--text-soft);
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 28px;
}
.page--essays-index .section-label .num,
.page--series-index .section-label .num,
.page--series .section-label .num {
  color: var(--signal);
  font-weight: 600;
}

/* ---------------------------------------------------------------------
 * Essays index (/essays/) — magazine table-of-contents
 * ------------------------------------------------------------------- */
.page--essays-index .essays-toc__head {
  padding: 12vh 7vw 64px;
  border-bottom: 1px solid var(--rule);
}
.page--essays-index .essays-toc__head-inner {
  max-width: 1200px;
  margin: 0 auto;
}
.page--essays-index .essays-toc__head h1 {
  font-family: var(--font-display);
  font-size: clamp(36px, 5.5vw, 72px);
  line-height: 1.05;
  letter-spacing: -0.035em;
  font-weight: 600;
  color: var(--text);
  margin: 0 0 20px;
}
.page--essays-index .essays-toc__dek {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(15px, 1.2vw, 18px);
  line-height: 1.65;
  color: var(--text-mute);
  margin: 0;
  max-width: 60ch;
}

.page--essays-index .essays-toc__filter {
  padding: 24px 7vw;
  border-bottom: 1px solid var(--rule);
  background: var(--bg-elev);
}
.page--essays-index .essays-toc__filter-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  gap: 12px 22px;
  align-items: baseline;
}
.page--essays-index .essays-toc__filter-label {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--text-soft);
}
.page--essays-index .essays-toc__filter ul {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 16px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.page--essays-index .essays-toc__filter a {
  font-size: 13px;
  color: var(--text-mute);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  padding-bottom: 1px;
  transition: color 160ms var(--ease), border-color 160ms var(--ease);
}
.page--essays-index .essays-toc__filter a:hover,
.page--essays-index .essays-toc__filter a.is-active {
  color: var(--signal);
  border-bottom-color: var(--signal);
}

.page--essays-index .essays-toc__list-wrap {
  padding: 64px 7vw 120px;
}
.page--essays-index .essays-toc__list-inner {
  max-width: 1200px;
  margin: 0 auto;
}
.page--essays-index .essays-toc__list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--rule);
}
.page--essays-index .toc-row {
  display: grid;
  grid-template-columns: 110px 180px 1fr 140px;
  gap: 28px;
  align-items: baseline;
  padding: 28px 0;
  border-bottom: 1px solid var(--rule);
}
.page--essays-index .toc-row__date {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--text-soft);
}
.page--essays-index .toc-row__series-tag {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--signal);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  padding-bottom: 1px;
  transition: border-color 160ms var(--ease);
}
.page--essays-index .toc-row__series-tag:hover {
  border-bottom-color: var(--signal);
}
.page--essays-index .toc-row__title {
  min-width: 0;
}
.page--essays-index .toc-row__issue {
  display: block;
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-soft);
  margin-bottom: 8px;
}
.page--essays-index .toc-row__title h2 {
  font-family: var(--font-display);
  font-size: clamp(20px, 1.8vw, 26px);
  line-height: 1.3;
  letter-spacing: -0.015em;
  font-weight: 600;
  color: var(--text);
  margin: 0;
}
.page--essays-index .toc-row__title a {
  color: inherit;
  text-decoration: none;
  border-bottom: 1px solid transparent;
  padding-bottom: 1px;
  transition: color 160ms var(--ease), border-color 160ms var(--ease);
}
.page--essays-index .toc-row__title a:hover {
  color: var(--signal);
  border-bottom-color: var(--signal);
}
.page--essays-index .toc-row__meta {
  display: flex;
  flex-direction: column;
  gap: 4px;
  align-items: flex-end;
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 11px;
  letter-spacing: 0.10em;
  text-transform: uppercase;
  color: var(--text-soft);
}
.page--essays-index .toc-row__lang {
  color: var(--text-mute);
}
.page--essays-index .essays-toc__empty {
  padding: 48px 0;
  text-align: center;
  color: var(--text-mute);
  font-size: 14px;
}

/* ---------------------------------------------------------------------
 * Series index (/series/)
 * ------------------------------------------------------------------- */
.page--series-index .series-toc__head {
  padding: 12vh 7vw 64px;
  border-bottom: 1px solid var(--rule);
}
.page--series-index .series-toc__head-inner {
  max-width: 1200px;
  margin: 0 auto;
}
.page--series-index .series-toc__head h1 {
  font-family: var(--font-display);
  font-size: clamp(36px, 5.5vw, 72px);
  line-height: 1.05;
  letter-spacing: -0.035em;
  font-weight: 600;
  color: var(--text);
  margin: 0 0 20px;
}
.page--series-index .series-toc__dek {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(15px, 1.2vw, 18px);
  line-height: 1.65;
  color: var(--text-mute);
  margin: 0;
  max-width: 60ch;
}
.page--series-index .series-toc__list-wrap {
  padding: 80px 7vw 120px;
}
.page--series-index .series-toc__list-inner {
  max-width: 1200px;
  margin: 0 auto;
}
.page--series-index .series-toc__list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--rule);
}
.page--series-index .series-row {
  display: grid;
  grid-template-columns: 130px 1fr 120px;
  gap: 40px;
  align-items: baseline;
  padding: 40px 0;
  border-bottom: 1px solid var(--rule);
}
.page--series-index .series-row__num {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--signal);
}
.page--series-index .series-row__main h2 {
  font-family: var(--font-display);
  font-size: clamp(22px, 2vw, 32px);
  line-height: 1.2;
  letter-spacing: -0.02em;
  font-weight: 600;
  margin: 0 0 12px;
  color: var(--text);
}
.page--series-index .series-row__main h2 a {
  color: inherit;
  text-decoration: none;
  border-bottom: 1px solid transparent;
  padding-bottom: 1px;
  transition: color 160ms var(--ease), border-color 160ms var(--ease);
}
.page--series-index .series-row__main h2 a:hover {
  color: var(--signal);
  border-bottom-color: var(--signal);
}
.page--series-index .series-row__intent {
  font-size: 14px;
  line-height: 1.7;
  color: var(--text-mute);
  margin: 0;
  max-width: 60ch;
}
.page--series-index .series-row__count {
  text-align: right;
  font-family: var(--font-display);
}
.page--series-index .series-row__count-num {
  display: block;
  font-size: clamp(28px, 3vw, 40px);
  font-weight: 600;
  color: var(--text);
  letter-spacing: -0.02em;
  line-height: 1;
}
.page--series-index .series-row__count-label {
  display: block;
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-soft);
  margin-top: 6px;
}

/* ---------------------------------------------------------------------
 * Per-series (/series/{slug}/)
 * ------------------------------------------------------------------- */
.page--series .series-page__head {
  padding: 12vh 7vw 64px;
  border-bottom: 1px solid var(--rule);
}
.page--series .series-page__head-inner {
  max-width: 1200px;
  margin: 0 auto;
}
.page--series .series-page__head h1 {
  font-family: var(--font-display);
  font-size: clamp(36px, 5.5vw, 72px);
  line-height: 1.05;
  letter-spacing: -0.035em;
  font-weight: 600;
  color: var(--text);
  margin: 0 0 24px;
}
.page--series .series-page__intent {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(15px, 1.2vw, 18px);
  line-height: 1.65;
  color: var(--text);
  margin: 0 0 16px;
  max-width: 60ch;
}
.page--series .series-page__description {
  font-size: 14px;
  line-height: 1.75;
  color: var(--text-mute);
  margin: 0 0 28px;
  max-width: 60ch;
}
.page--series .series-page__count {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-soft);
}
.page--series .series-page__count .num {
  color: var(--signal);
  font-weight: 600;
  font-size: 14px;
  margin-right: 6px;
}
.page--series .series-page__list-wrap {
  padding: 64px 7vw 120px;
}
.page--series .series-page__list-inner {
  max-width: 1200px;
  margin: 0 auto;
}
.page--series .series-page__list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--rule);
}
.page--series .series-row__essay {
  display: grid;
  grid-template-columns: 110px 1fr 140px;
  gap: 28px;
  align-items: baseline;
  padding: 28px 0;
  border-bottom: 1px solid var(--rule);
}
.page--series .series-row__essay-date {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--text-soft);
}
.page--series .series-row__essay-issue {
  display: block;
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-soft);
  margin-bottom: 8px;
}
.page--series .series-row__essay-main h2 {
  font-family: var(--font-display);
  font-size: clamp(20px, 1.8vw, 26px);
  line-height: 1.3;
  letter-spacing: -0.015em;
  font-weight: 600;
  margin: 0 0 10px;
  color: var(--text);
}
.page--series .series-row__essay-main h2 a {
  color: inherit;
  text-decoration: none;
  border-bottom: 1px solid transparent;
  padding-bottom: 1px;
  transition: color 160ms var(--ease), border-color 160ms var(--ease);
}
.page--series .series-row__essay-main h2 a:hover {
  color: var(--signal);
  border-bottom-color: var(--signal);
}
.page--series .series-row__essay-dek {
  font-size: 13px;
  line-height: 1.7;
  color: var(--text-mute);
  margin: 0;
  max-width: 60ch;
}
.page--series .series-row__essay-meta {
  display: flex;
  flex-direction: column;
  gap: 4px;
  align-items: flex-end;
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 11px;
  letter-spacing: 0.10em;
  text-transform: uppercase;
  color: var(--text-soft);
}
.page--series .series-row__essay-lang {
  color: var(--text-mute);
}
.page--series .series-page__empty {
  padding: 48px 0;
  text-align: center;
  color: var(--text-mute);
  font-size: 14px;
}
.page--series .series-page__back {
  margin-top: 48px;
  padding-top: 24px;
  border-top: 1px solid var(--rule);
}
.page--series .series-page__back a {
  font-size: 13px;
  color: var(--text-mute);
  text-decoration: none;
  border-bottom: 1px solid var(--rule);
  padding-bottom: 1px;
  transition: color 160ms var(--ease), border-color 160ms var(--ease);
}
.page--series .series-page__back a:hover {
  color: var(--signal);
  border-bottom-color: var(--signal);
}

/* ---------------------------------------------------------------------
 * Mobile
 * ------------------------------------------------------------------- */
@media (max-width: 900px) {
  .page--essays-index .essays-toc__head,
  .page--series-index .series-toc__head,
  .page--series .series-page__head {
    padding: 80px 6vw 48px;
  }
  .page--essays-index .essays-toc__list-wrap,
  .page--series-index .series-toc__list-wrap,
  .page--series .series-page__list-wrap {
    padding: 56px 6vw 96px;
  }
  .page--essays-index .essays-toc__filter { padding: 18px 6vw; }
  .page--essays-index .toc-row {
    grid-template-columns: 1fr;
    gap: 8px;
    padding: 24px 0;
  }
  .page--essays-index .toc-row__meta {
    flex-direction: row;
    gap: 14px;
    align-items: baseline;
  }
  .page--series-index .series-row {
    grid-template-columns: 1fr;
    gap: 12px;
    padding: 32px 0;
  }
  .page--series-index .series-row__count { text-align: left; }
  .page--series .series-row__essay {
    grid-template-columns: 1fr;
    gap: 8px;
    padding: 24px 0;
  }
  .page--series .series-row__essay-meta {
    flex-direction: row;
    gap: 14px;
    align-items: baseline;
  }
}

/* ---------------------------------------------------------------------
 * prefers-reduced-motion safety net
 * ------------------------------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
  .page--essays-index *,
  .page--series-index *,
  .page--series * {
    transition-duration: 0ms !important;
    animation-duration: 0ms !important;
  }
}