:root {
  --ink: #f5efe1;
  --ink-soft: #d9cfb6;
  --muted: #a9aa93;
  --night: #10130f;
  --forest: #18241b;
  --moss: #314332;
  --moss-2: #49664d;
  --gold: #d8b766;
  --amber: #a96f34;
  --crimson: #73362e;
  --paper: #f2e6cf;
  --paper-ink: #27251d;
  --line: rgba(245, 239, 225, 0.16);
  --line-strong: rgba(216, 183, 102, 0.36);
  --shadow: 0 18px 60px rgba(0, 0, 0, 0.34);
  --radius: 8px;
  color-scheme: dark;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100dvh;
  font-family: "Yu Gothic", "Hiragino Kaku Gothic ProN", Meiryo, sans-serif;
  background:
    linear-gradient(180deg, rgba(16, 19, 15, 0.94), rgba(24, 36, 27, 0.98) 44%, #11140f 100%),
    #10130f;
  color: var(--ink);
  line-height: 1.7;
  overflow-x: hidden;
}

a {
  color: inherit;
}

button,
input {
  font: inherit;
}

button {
  cursor: pointer;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  gap: 24px;
  min-height: 68px;
  padding: 10px clamp(18px, 4vw, 56px);
  background: rgba(16, 19, 15, 0.82);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(16px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-width: max-content;
  color: var(--ink);
  font-weight: 700;
  text-decoration: none;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  border: 1px solid var(--line-strong);
  border-radius: 50%;
  color: var(--gold);
  font-family: "Yu Mincho", "Hiragino Mincho ProN", serif;
  font-size: 0.86rem;
  letter-spacing: 0;
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 6px;
  width: 100%;
}

.site-nav a {
  min-height: 36px;
  padding: 6px 10px;
  border-radius: 999px;
  color: var(--ink-soft);
  font-size: 0.88rem;
  text-decoration: none;
}

.site-nav a:hover {
  color: var(--gold);
  background: rgba(216, 183, 102, 0.09);
}

.site-nav .nav-back {
  margin-left: auto;
  opacity: 0.6;
  font-size: 0.82rem;
}

.site-nav .nav-back:hover {
  opacity: 1;
}

.hero {
  position: relative;
  min-height: min(760px, calc(100dvh - 32px));
  display: grid;
  align-items: center;
  overflow: hidden;
  border-bottom: 1px solid var(--line);
}

.hero-bg,
.hero-shade {
  position: absolute;
  inset: 0;
}

.hero-bg {
  background-image: url("assets/hero-hitsuki-shinji.png");
  background-size: cover;
  background-position: center;
  filter: saturate(0.9) contrast(1.02);
  transform: scale(1.01);
}

.hero-shade {
  background:
    linear-gradient(90deg, rgba(16, 19, 15, 0.9) 0%, rgba(16, 19, 15, 0.62) 34%, rgba(16, 19, 15, 0.22) 68%, rgba(16, 19, 15, 0.42) 100%),
    linear-gradient(180deg, rgba(16, 19, 15, 0.24), rgba(16, 19, 15, 0.1) 56%, rgba(16, 19, 15, 0.92) 100%);
}

.hero-content {
  position: relative;
  z-index: 1;
  width: min(680px, calc(100% - 36px));
  margin-left: clamp(18px, 8vw, 112px);
  padding: 110px 0 170px;
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--gold);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0;
  text-transform: uppercase;
}

.hero h1 {
  margin: 0;
  font-family: "Yu Mincho", "Hiragino Mincho ProN", serif;
  font-size: clamp(4rem, 13vw, 8.8rem);
  font-weight: 500;
  line-height: 0.96;
  letter-spacing: 0;
}

.hero-copy {
  width: min(610px, 100%);
  margin: 26px 0 0;
  color: var(--ink-soft);
  font-size: clamp(1rem, 2.2vw, 1.13rem);
  overflow-wrap: anywhere;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 34px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 10px 18px;
  border: 1px solid transparent;
  border-radius: var(--radius);
  font-weight: 700;
  text-decoration: none;
}

.button-primary {
  background: var(--gold);
  color: #1f1d15;
}

.button-ghost {
  border-color: var(--line-strong);
  color: var(--ink);
  background: rgba(16, 19, 15, 0.32);
}

.button-muted {
  width: fit-content;
  border-color: rgba(242, 230, 207, 0.24);
  color: var(--ink);
  background: rgba(242, 230, 207, 0.08);
}

.hero-stats {
  position: absolute;
  z-index: 2;
  right: clamp(18px, 5vw, 70px);
  bottom: 30px;
  display: grid;
  grid-template-columns: repeat(3, minmax(88px, 1fr));
  gap: 1px;
  width: min(420px, calc(100% - 36px));
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(16, 19, 15, 0.68);
  backdrop-filter: blur(12px);
}

.hero-stats div {
  min-height: 92px;
  padding: 16px;
  background: rgba(242, 230, 207, 0.06);
}

.hero-stats dt {
  color: var(--gold);
  font-family: "Yu Mincho", "Hiragino Mincho ProN", serif;
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  line-height: 1;
}

.hero-stats dd {
  margin: 8px 0 0;
  color: var(--ink-soft);
  font-size: 0.86rem;
}

.section {
  padding: clamp(66px, 9vw, 112px) clamp(18px, 4vw, 56px);
}

.section-inner {
  width: min(1180px, 100%);
  margin: 0 auto;
}

.two-column {
  display: grid;
  grid-template-columns: minmax(260px, 0.85fr) minmax(0, 1.15fr);
  gap: clamp(28px, 5vw, 70px);
  align-items: start;
}

.section-heading h2 {
  margin: 0;
  font-family: "Yu Mincho", "Hiragino Mincho ProN", serif;
  font-size: clamp(2.2rem, 5vw, 4rem);
  font-weight: 500;
  line-height: 1.12;
  letter-spacing: 0;
}

.section-heading h2 + p,
.section-heading p:last-child {
  margin: 18px 0 0;
  color: var(--ink-soft);
  overflow-wrap: anywhere;
}

.section-heading.compact {
  width: min(760px, 100%);
  margin-bottom: 28px;
}

.about-section,
.commentary-section {
  background:
    linear-gradient(180deg, rgba(49, 67, 50, 0.2), rgba(16, 19, 15, 0)),
    #12170f;
}

.about-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.info-panel,
.commentary-card,
.video-card,
.workflow-item,
.passage-card,
.volume-card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(242, 230, 207, 0.055);
  box-shadow: 0 10px 36px rgba(0, 0, 0, 0.18);
}

.info-panel {
  min-height: 150px;
  padding: 20px;
}

.info-panel h3,
.commentary-card h3,
.video-card h3,
.workflow-item h3,
.passage-card h4 {
  margin: 0;
  color: var(--ink);
  line-height: 1.35;
}

.info-panel p,
.commentary-card p,
.video-card p,
.workflow-item p {
  margin: 12px 0 0;
  color: var(--ink-soft);
  overflow-wrap: anywhere;
}

.archive-section {
  background:
    linear-gradient(180deg, rgba(115, 54, 46, 0.1), rgba(16, 19, 15, 0) 32%),
    #10130f;
}

.archive-toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 18px;
}

.search-field {
  display: grid;
  grid-template-columns: auto minmax(200px, 420px);
  align-items: center;
  gap: 10px;
  min-height: 46px;
  padding: 6px 10px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(242, 230, 207, 0.065);
  color: var(--ink-soft);
}

.search-field input {
  min-width: 0;
  border: 0;
  outline: 0;
  background: transparent;
  color: var(--ink);
}

.search-field input::placeholder {
  color: rgba(217, 207, 182, 0.62);
}

.segmented {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.segment {
  min-height: 42px;
  padding: 8px 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: var(--ink-soft);
  background: rgba(242, 230, 207, 0.04);
}

.segment.active {
  color: #201d14;
  border-color: var(--gold);
  background: var(--gold);
}

.archive-layout {
  display: grid;
  grid-template-columns: minmax(260px, 360px) minmax(0, 1fr);
  gap: 18px;
  align-items: start;
}

.volume-list-wrap {
  position: sticky;
  top: 86px;
  max-height: calc(100dvh - 108px);
  overflow: auto;
  padding-right: 4px;
}

.volume-list {
  display: grid;
  gap: 8px;
}

.volume-card {
  display: grid;
  width: 100%;
  gap: 8px;
  padding: 14px;
  color: var(--ink-soft);
  text-align: left;
}

.volume-card:hover,
.volume-card.active {
  border-color: var(--line-strong);
  background: rgba(216, 183, 102, 0.12);
}

.volume-card strong {
  color: var(--ink);
  font-size: 1.1rem;
}

.volume-card-top,
.volume-card-bottom,
.video-meta,
.commentary-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  align-items: center;
  color: var(--muted);
  font-size: 0.78rem;
}

.volume-card-top span,
.volume-card-bottom span,
.video-meta span,
.commentary-meta span {
  display: inline-flex;
  min-height: 24px;
  align-items: center;
  padding: 2px 8px;
  border: 1px solid rgba(242, 230, 207, 0.14);
  border-radius: 999px;
}

.volume-period {
  font-size: 0.86rem;
}

.passage-panel {
  min-width: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(11, 14, 10, 0.46);
  box-shadow: var(--shadow);
}

.selected-volume {
  padding: 24px 24px 18px;
  border-bottom: 1px solid var(--line);
}

.selected-volume h3 {
  margin: 0;
  font-family: "Yu Mincho", "Hiragino Mincho ProN", serif;
  font-size: clamp(2rem, 5vw, 3.2rem);
  font-weight: 500;
  line-height: 1.15;
}

.selected-volume p:not(.eyebrow) {
  margin: 12px 0 0;
  color: var(--ink-soft);
}

.tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 14px;
}

.tag-row span {
  display: inline-flex;
  min-height: 26px;
  align-items: center;
  padding: 3px 9px;
  border: 1px solid rgba(216, 183, 102, 0.28);
  border-radius: 999px;
  color: var(--gold);
  font-size: 0.78rem;
  background: rgba(216, 183, 102, 0.08);
}

.passage-tools {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
  justify-content: space-between;
  padding: 14px 24px;
  border-bottom: 1px solid var(--line);
}

.count-label {
  color: var(--ink-soft);
  font-size: 0.9rem;
}

.text-link,
.passage-links a {
  color: var(--gold);
  font-weight: 700;
  text-decoration: none;
}

.text-link:hover,
.passage-links a:hover {
  text-decoration: underline;
}

.passage-list {
  display: grid;
  gap: 10px;
  padding: 18px;
}

.passage-card {
  padding: 16px;
  scroll-margin-top: 92px;
}

.passage-card:target,
.commentary-card:target {
  border-color: var(--gold);
  box-shadow: 0 0 0 3px rgba(216, 183, 102, 0.13);
}

/* 解説掲載済み帖：左ボーダーで視覚的に識別 */
.passage-card.has-commentary {
  border-left: 3px solid var(--gold);
}
.passage-card.has-commentary .passage-label::after {
  content: ' ✦';
  color: var(--gold);
  font-size: 0.7em;
}

.passage-card-head {
  display: flex;
  gap: 14px;
  justify-content: space-between;
  align-items: flex-start;
}

.passage-label {
  color: var(--gold);
  font-size: 0.8rem;
  font-weight: 700;
}

.status-pill {
  display: inline-flex;
  flex: 0 0 auto;
  min-height: 28px;
  align-items: center;
  padding: 4px 9px;
  border-radius: 999px;
  color: var(--ink-soft);
  font-size: 0.78rem;
  background: rgba(242, 230, 207, 0.08);
}

.status-pill.sample {
  color: #231d0f;
  background: var(--gold);
}

.status-pill.missing {
  color: #f6d7d1;
  background: rgba(115, 54, 46, 0.72);
}

.passage-excerpt {
  margin: 12px 0 0;
  color: var(--ink-soft);
  overflow-wrap: anywhere;
}

.passage-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 14px;
  font-size: 0.9rem;
}

.video-note {
  display: grid;
  gap: 6px;
  margin-top: 12px;
  padding: 10px;
  border-left: 3px solid var(--gold);
  color: var(--ink-soft);
  background: rgba(216, 183, 102, 0.08);
}

.video-section {
  background:
    linear-gradient(180deg, rgba(169, 111, 52, 0.12), rgba(16, 19, 15, 0) 40%),
    #15190f;
}

.video-list {
  display: grid;
  gap: 14px;
}

.video-card,
.commentary-card {
  padding: 22px;
}

.video-card h3,
.commentary-card h3 {
  margin-top: 12px;
}

.workflow-section {
  background: #10130f;
}

.workflow-list,
.commentary-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.workflow-item {
  display: grid;
  grid-template-columns: 58px minmax(0, 1fr);
  gap: 16px;
  padding: 20px;
}

.workflow-item > span {
  display: grid;
  place-items: center;
  width: 48px;
  height: 48px;
  border: 1px solid var(--line-strong);
  border-radius: 50%;
  color: var(--gold);
  font-family: "Yu Mincho", "Hiragino Mincho ProN", serif;
  font-size: 1.2rem;
}

.site-footer {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  align-items: flex-start;
  justify-content: space-between;
  padding: 34px clamp(18px, 4vw, 56px);
  border-top: 1px solid var(--line);
  background: #0c0f0b;
  color: var(--ink-soft);
}

.site-footer p {
  margin: 8px 0 0;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.footer-links a {
  color: var(--gold);
  text-decoration: none;
}

.footer-links a:hover {
  text-decoration: underline;
}

/* ── アコーディオン解説パネル ─────────────────── */

.commentary-toggle {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 3px 10px;
  border: 1px solid var(--gold);
  border-radius: 4px;
  background: transparent;
  color: var(--gold);
  font-size: 0.88rem;
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
}

.commentary-toggle:hover {
  background: rgba(216, 183, 102, 0.12);
}

.commentary-toggle[aria-expanded="true"] {
  background: rgba(216, 183, 102, 0.18);
}

.commentary-toggle.no-data {
  border-color: var(--line);
  color: var(--ink-soft);
  opacity: 0.55;
  cursor: default;
  pointer-events: none;
}

.commentary-panel {
  margin-top: 14px;
  border-top: 1px solid var(--line);
}

.commentary-panel[hidden] {
  display: none;
}

.commentary-panel-inner {
  padding: 16px 4px 4px;
  display: grid;
  gap: 12px;
}

.commentary-source {
  font-size: 0.82rem;
  color: var(--gold);
}

.commentary-source a {
  color: var(--gold);
  text-decoration: underline;
  margin-left: 6px;
}

.commentary-transcript {
  color: var(--ink-soft);
  line-height: 1.9;
  overflow-wrap: anywhere;
}

.commentary-added {
  font-size: 0.78rem;
  color: var(--ink-muted, var(--ink-soft));
  opacity: 0.6;
}

@media (max-width: 920px) {
  .site-header {
    align-items: flex-start;
    flex-direction: column;
    gap: 8px;
  }

  .site-nav {
    justify-content: flex-start;
  }

  .hero {
    min-height: 780px;
  }

  .hero-content {
    margin: 0 auto;
    padding-top: 78px;
  }

  .hero-stats {
    right: 18px;
    left: 18px;
    width: auto;
  }

  .two-column,
  .archive-layout {
    grid-template-columns: 1fr;
  }

  .volume-list-wrap {
    position: relative;
    top: auto;
    max-height: none;
    padding-right: 0;
  }

  .volume-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 640px) {
  .section {
    padding-inline: 14px;
  }

  .site-header {
    padding-inline: 14px;
  }

  .site-nav a {
    padding-inline: 8px;
    font-size: 0.82rem;
  }

  .hero {
    min-height: 820px;
  }

  .hero-bg {
    background-position: 58% center;
  }

  .hero-content {
    width: calc(100% - 28px);
    max-width: 360px;
    margin-right: 14px;
    margin-left: 14px;
    padding-bottom: 230px;
  }

  .hero-copy {
    max-width: 100%;
    word-break: break-all;
  }

  .hero-stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .hero-stats div {
    min-height: 74px;
    padding: 11px 10px;
  }

  .hero-stats dt {
    font-size: 1.62rem;
  }

  .hero-stats dd {
    margin-top: 4px;
    font-size: 0.76rem;
  }

  .about-grid,
  .volume-list,
  .workflow-list,
  .commentary-list {
    grid-template-columns: 1fr;
  }

  .archive-toolbar,
  .passage-tools,
  .passage-card-head {
    align-items: stretch;
    flex-direction: column;
  }

  .search-field {
    grid-template-columns: 1fr;
    width: 100%;
  }

  .segmented {
    width: 100%;
  }

  .segment {
    flex: 1 1 140px;
  }

  .selected-volume,
  .passage-tools {
    padding-inline: 16px;
  }

  .passage-list {
    padding: 12px;
  }

  .workflow-item {
    grid-template-columns: 1fr;
  }
}