@import url('https://fonts.googleapis.com/css2?family=BIZ+UDPGothic:wght@400;700&family=BIZ+UDPMincho:wght@400;700&display=swap');

:root { --font-mincho: 'BIZ UDPMincho'; --font-gothic: 'BIZ UDPGothic'; }

/* ============================================================
   オパルステーション — warm pearl/opal dossier research station
   Architecture: full-width nameplate masthead + station directory
   index hub (home) + dossier-with-marginalia (article).
   Authoritative, organized, careful. NOT iridescent.
   ============================================================ */

:root {
  --pearl: #f1ede4;
  --pearl-deep: #e7e1d2;
  --paper: #faf8f2;
  --ink: #211d17;
  --ink-soft: #574f43;
  --ink-faint: #8a8071;
  --brass: #9a7b3f;
  --brass-soft: #b89a5e;
  --brass-deep: #7c6230;
  --line: rgba(33, 29, 23, 0.16);
  --line-soft: rgba(33, 29, 23, 0.09);
  --shell: 1320px;
  --gap: clamp(20px, 3vw, 40px);
}

* {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background-color: var(--pearl);
  color: var(--ink);
  font-family: var(--font-gothic), "Hiragino Sans", "Yu Gothic", system-ui, sans-serif;
  font-size: 17px;
  line-height: 1.85;
  letter-spacing: 0.01em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a {
  color: var(--brass-deep);
}

h1,
h2,
h3 {
  font-family: var(--font-mincho), "Hiragino Mincho ProN", "Yu Mincho", serif;
  font-weight: 700;
  letter-spacing: 0.015em;
  line-height: 1.35;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--ink);
  color: var(--pearl);
  padding: 10px 16px;
  z-index: 100;
}
.skip-link:focus {
  left: 12px;
  top: 12px;
}

/* ===================== NAMEPLATE MASTHEAD ===================== */
.nameplate {
  width: 100%;
  background: var(--pearl);
  border-top: 5px solid var(--brass);
}
.nameplate-inner {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 26px 24px 18px;
  text-align: center;
}
.nameplate-mark {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  color: var(--ink);
}
.nameplate-reading {
  font-family: var(--font-gothic), system-ui, sans-serif;
  font-size: 0.72rem;
  letter-spacing: 0.42em;
  text-transform: uppercase;
  color: var(--brass-deep);
  padding-left: 0.42em;
}
.nameplate-name {
  font-family: var(--font-mincho), serif;
  font-weight: 700;
  font-size: clamp(2.1rem, 6vw, 4rem);
  letter-spacing: 0.16em;
  line-height: 1;
  color: var(--ink);
  padding-left: 0.16em;
}
.nameplate-rule {
  width: 100%;
  background: var(--ink);
  color: var(--pearl);
}
.nameplate-rule-inner {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 9px 24px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px;
  font-size: 0.74rem;
  letter-spacing: 0.18em;
}
.rule-tick {
  color: var(--brass-soft);
}
.rule-section {
  color: var(--pearl);
  opacity: 0.92;
  position: relative;
  padding-right: 14px;
}
.rule-section::after {
  content: "·";
  position: absolute;
  right: 0;
  color: var(--brass-soft);
}
.rule-section:last-of-type::after {
  content: "";
}
.rule-tail {
  margin-left: auto;
  color: var(--brass-soft);
  text-transform: uppercase;
  letter-spacing: 0.3em;
  font-size: 0.66rem;
}

/* ===================== HOME · CONCOURSE ===================== */
.concourse {
  max-width: var(--shell);
  margin: 0 auto;
  padding: clamp(28px, 4vw, 56px) 24px 64px;
}

/* lead cover */
.concourse-lead {
  margin-bottom: clamp(36px, 5vw, 60px);
}
.lead-cover {
  border: 1px solid var(--line);
  background:
    linear-gradient(118deg, rgba(28, 24, 18, 0.82), rgba(28, 24, 18, 0.42) 62%, rgba(28, 24, 18, 0.2)),
    url("/images/opalstation-lead.jpg") center / cover no-repeat,
    linear-gradient(135deg, #2b2620, #4a3f2c 55%, var(--brass));
  border-radius: 2px;
  min-height: 360px;
  display: flex;
  align-items: flex-end;
  box-shadow: 0 24px 60px -42px rgba(33, 29, 23, 0.6);
}
.lead-cover-text {
  padding: clamp(28px, 4vw, 52px);
  max-width: 760px;
  color: var(--pearl);
}
.lead-kicker {
  margin: 0 0 14px;
  font-size: 0.76rem;
  letter-spacing: 0.32em;
  text-transform: uppercase;
  color: var(--brass-soft);
}
.lead-cover-text h1 {
  margin: 0 0 16px;
  font-size: clamp(2rem, 4.4vw, 3.1rem);
  color: var(--pearl);
  letter-spacing: 0.06em;
}
.lead-charter {
  margin: 0 0 26px;
  font-size: 1.02rem;
  line-height: 1.95;
  color: rgba(241, 237, 228, 0.92);
  max-width: 60ch;
}
.lead-board {
  display: flex;
  flex-wrap: wrap;
  gap: 1px;
  margin: 0;
  background: rgba(241, 237, 228, 0.22);
  border: 1px solid rgba(241, 237, 228, 0.28);
  width: fit-content;
}
.board-cell {
  background: rgba(20, 17, 12, 0.62);
  padding: 14px 22px;
  min-width: 132px;
}
.board-cell dt {
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  color: rgba(241, 237, 228, 0.7);
  margin-bottom: 6px;
}
.board-cell dd {
  margin: 0;
  font-family: var(--font-mincho), serif;
  font-weight: 700;
  font-size: 1.9rem;
  line-height: 1;
  color: var(--brass-soft);
}
.cell-of {
  font-size: 0.95rem;
  color: rgba(241, 237, 228, 0.6);
}
.cell-lang {
  font-size: 1.2rem !important;
  color: var(--pearl) !important;
  letter-spacing: 0.1em;
}

/* directory */
.directory {
  margin-bottom: clamp(40px, 5vw, 64px);
}
.directory-head {
  border-bottom: 2px solid var(--ink);
  padding-bottom: 14px;
  margin-bottom: 26px;
}
.directory-head h2 {
  margin: 0 0 6px;
  font-size: clamp(1.4rem, 2.6vw, 1.9rem);
  position: relative;
  padding-left: 20px;
}
.directory-head h2::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.18em;
  bottom: 0.18em;
  width: 6px;
  background: var(--brass);
}
.directory-head p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 0.96rem;
}
.directory-grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
  counter-reset: none;
}
.directory-card {
  background: var(--paper);
  border: 1px solid var(--line);
  border-left: 4px solid var(--brass);
  border-radius: 2px;
  transition: transform 0.18s ease, box-shadow 0.18s ease, border-color 0.18s ease;
}
.directory-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 18px 40px -30px rgba(33, 29, 23, 0.55);
  border-left-color: var(--brass-deep);
}
.directory-link {
  display: block;
  padding: 24px 26px 22px;
  text-decoration: none;
  color: inherit;
}
.card-rail {
  display: flex;
  align-items: baseline;
  gap: 14px;
  border-bottom: 1px solid var(--line-soft);
  padding-bottom: 12px;
  margin-bottom: 14px;
}
.card-number {
  font-family: var(--font-mincho), serif;
  font-weight: 700;
  font-size: 1.7rem;
  line-height: 1;
  color: var(--brass);
}
.card-dept {
  font-size: 0.74rem;
  letter-spacing: 0.18em;
  color: var(--ink-faint);
}
.card-title {
  margin: 0 0 10px;
  font-size: 1.28rem;
  color: var(--ink);
}
.card-focus {
  margin: 0 0 18px;
  color: var(--ink-soft);
  font-size: 0.95rem;
  line-height: 1.8;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.card-foot {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.82rem;
}
.card-updated {
  color: var(--ink-faint);
  letter-spacing: 0.04em;
}
.card-open {
  color: var(--brass-deep);
  font-weight: 700;
}

/* route map board */
.routemap {
  margin-bottom: clamp(40px, 5vw, 64px);
}
.routemap-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  border-bottom: 2px solid var(--ink);
  padding-bottom: 14px;
  margin-bottom: 8px;
}
.routemap-head h2 {
  margin: 0;
  font-size: clamp(1.3rem, 2.4vw, 1.7rem);
}
.routemap-count {
  font-size: 0.8rem;
  letter-spacing: 0.16em;
  color: var(--brass-deep);
  white-space: nowrap;
}
.routemap-list {
  list-style: none;
  margin: 0;
  padding: 0;
}
.route-row {
  display: grid;
  grid-template-columns: 56px 220px 1fr 76px;
  align-items: center;
  gap: 18px;
  padding: 16px 6px;
  border-bottom: 1px solid var(--line-soft);
}
.route-code {
  font-family: var(--font-mincho), serif;
  font-weight: 700;
  color: var(--brass);
  font-size: 1.05rem;
}
.route-name {
  font-weight: 700;
  color: var(--ink);
}
.route-scope {
  color: var(--ink-soft);
  font-size: 0.92rem;
}
.route-status {
  justify-self: end;
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  padding: 4px 12px;
  border-radius: 999px;
  border: 1px solid var(--line);
  white-space: nowrap;
}
.route-row.is-open .route-status {
  color: var(--brass-deep);
  border-color: var(--brass-soft);
  background: rgba(154, 123, 63, 0.08);
}
.route-row.is-prep .route-status {
  color: var(--ink-faint);
}
.route-row.is-prep {
  opacity: 0.82;
}

/* charter */
.charter {
  border: 1px solid var(--line);
  background: var(--pearl-deep);
  border-radius: 2px;
}
.charter-inner {
  padding: clamp(26px, 3.5vw, 40px);
}
.charter-inner h2 {
  margin: 0 0 18px;
  font-size: 1.4rem;
}
.charter-list {
  margin: 0 0 22px;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 14px;
}
.charter-list li {
  position: relative;
  padding-left: 26px;
  color: var(--ink-soft);
  line-height: 1.8;
}
.charter-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 13px;
  height: 2px;
  background: var(--brass);
}
.charter-sign {
  margin: 0;
  font-family: var(--font-mincho), serif;
  color: var(--brass-deep);
  letter-spacing: 0.08em;
}

/* ===================== ARTICLE · DOSSIER ===================== */
.dossier {
  max-width: var(--shell);
  margin: 0 auto;
  padding: clamp(26px, 4vw, 52px) 24px 64px;
}
.dossier-sheet {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 2px;
  padding: clamp(26px, 4vw, 56px);
  box-shadow: 0 28px 70px -52px rgba(33, 29, 23, 0.55);
}
.dossier-head {
  border-bottom: 2px solid var(--ink);
  padding-bottom: 24px;
  margin-bottom: 30px;
}
.dossier-eyebrow {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 0 0 16px;
  font-size: 0.78rem;
  letter-spacing: 0.16em;
  color: var(--ink-faint);
}
.eyebrow-back {
  text-decoration: none;
  color: var(--brass-deep);
  font-weight: 700;
}
.eyebrow-sep {
  color: var(--brass-soft);
}
.dossier-title {
  margin: 0 0 24px;
  font-size: clamp(1.7rem, 3.6vw, 2.6rem);
  color: var(--ink);
  letter-spacing: 0.04em;
}
.dossier-ledger {
  margin: 0;
  border: 1px solid var(--line);
  border-radius: 2px;
  overflow: hidden;
  max-width: 560px;
}
.ledger-row {
  display: grid;
  grid-template-columns: 90px 1fr;
  border-bottom: 1px solid var(--line-soft);
}
.ledger-row:last-child {
  border-bottom: none;
}
.ledger-row dt {
  background: var(--pearl-deep);
  padding: 9px 14px;
  font-size: 0.8rem;
  letter-spacing: 0.14em;
  color: var(--ink-soft);
  border-right: 1px solid var(--line-soft);
}
.ledger-row dd {
  margin: 0;
  padding: 9px 16px;
  font-size: 0.92rem;
  color: var(--ink);
}

/* two-column reading structure: wide main + narrow right marginalia */
.dossier-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 264px;
  gap: clamp(28px, 4vw, 52px);
  align-items: start;
}
.dossier-main {
  min-width: 0;
}
.dossier-summary {
  margin: 0 0 30px;
  padding: 18px 22px;
  background: var(--pearl);
  border-left: 4px solid var(--brass);
  border-radius: 2px;
  color: var(--ink);
  font-size: 1.02rem;
  line-height: 1.95;
}
.summary-mark {
  display: inline-block;
  font-family: var(--font-mincho), serif;
  font-weight: 700;
  font-size: 0.78rem;
  letter-spacing: 0.18em;
  color: var(--brass-deep);
  margin-right: 12px;
  padding: 2px 9px;
  border: 1px solid var(--brass-soft);
  border-radius: 2px;
  vertical-align: 2px;
}

/* injected article content + numbered sections */
.article-content {
  counter-reset: sec;
  font-size: 1.02rem;
}
.article-content > h2 {
  counter-increment: sec;
  margin: 38px 0 16px;
  font-size: 1.45rem;
  color: var(--ink);
  padding-bottom: 8px;
  border-bottom: 1px solid var(--line-soft);
}
.article-content > h2::before {
  content: counter(sec, decimal-leading-zero);
  font-family: var(--font-mincho), serif;
  color: var(--brass);
  margin-right: 14px;
  font-size: 1.1rem;
  letter-spacing: 0.05em;
}
.article-content h3 {
  margin: 26px 0 12px;
  font-size: 1.15rem;
  color: var(--ink);
}
.article-content p {
  margin: 0 0 18px;
  color: var(--ink-soft);
}
.article-content a {
  color: var(--brass-deep);
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}
.article-content a:hover {
  color: var(--ink);
}
.article-content ul,
.article-content ol {
  margin: 0 0 20px;
  padding-left: 1.3em;
}
.article-content li {
  margin-bottom: 8px;
  color: var(--ink-soft);
}
.article-content ul li::marker {
  color: var(--brass);
}
.article-content blockquote {
  margin: 24px 0;
  padding: 16px 24px;
  border-left: 4px solid var(--brass);
  background: var(--pearl);
  font-family: var(--font-mincho), serif;
  font-size: 1.08rem;
  line-height: 1.9;
  color: var(--ink);
}
.article-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 22px 0;
  font-size: 0.94rem;
  border: 1px solid var(--line);
}
.article-content thead th {
  background: var(--ink);
  color: var(--pearl);
  font-family: var(--font-mincho), serif;
  font-weight: 700;
  text-align: left;
  padding: 11px 14px;
  letter-spacing: 0.04em;
}
.article-content tbody td {
  padding: 11px 14px;
  border-top: 1px solid var(--line-soft);
  color: var(--ink-soft);
  vertical-align: top;
}
.article-content tbody tr:nth-child(even) td {
  background: rgba(231, 225, 210, 0.4);
}

/* right marginalia / 注記 */
.dossier-margin {
  position: sticky;
  top: 24px;
  border-left: 1px solid var(--line);
  padding-left: 22px;
}
.margin-head {
  margin: 0 0 16px;
  font-family: var(--font-mincho), serif;
  font-weight: 700;
  font-size: 0.86rem;
  letter-spacing: 0.28em;
  color: var(--brass-deep);
  text-transform: uppercase;
}
.margin-list {
  list-style: none;
  margin: 0 0 22px;
  padding: 0;
  counter-reset: note;
}
.margin-note {
  counter-increment: note;
  margin-bottom: 18px;
  padding-bottom: 18px;
  border-bottom: 1px dashed var(--line-soft);
}
.margin-note:last-child {
  border-bottom: none;
}
.margin-label {
  display: block;
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  color: var(--ink-faint);
  margin-bottom: 6px;
}
.margin-label::before {
  content: "注" counter(note) " · ";
  color: var(--brass);
}
.margin-body {
  display: block;
  font-size: 0.88rem;
  line-height: 1.75;
  color: var(--ink-soft);
}
.margin-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
}
.margin-tag {
  font-size: 0.74rem;
  letter-spacing: 0.06em;
  color: var(--brass-deep);
  border: 1px solid var(--brass-soft);
  background: rgba(154, 123, 63, 0.07);
  border-radius: 999px;
  padding: 3px 11px;
}

/* faq + source note */
.dossier-faq {
  margin-top: 40px;
  border-top: 2px solid var(--ink);
  padding-top: 26px;
}
.dossier-faq h2,
.dossier-sourcenote h2 {
  font-size: 1.3rem;
  margin: 0 0 16px;
}
.dossier-faq details {
  border: 1px solid var(--line);
  border-radius: 2px;
  background: var(--pearl);
  margin-bottom: 12px;
  padding: 4px 18px;
}
.dossier-faq summary {
  cursor: pointer;
  padding: 12px 0;
  font-weight: 700;
  color: var(--ink);
  list-style: none;
  position: relative;
  padding-right: 28px;
}
.dossier-faq summary::-webkit-details-marker {
  display: none;
}
.dossier-faq summary::after {
  content: "+";
  position: absolute;
  right: 0;
  top: 11px;
  color: var(--brass);
  font-size: 1.2rem;
}
.dossier-faq details[open] summary::after {
  content: "−";
}
.dossier-faq details p {
  margin: 0 0 14px;
  color: var(--ink-soft);
}
.dossier-sourcenote {
  margin-top: 36px;
  padding: 22px 24px;
  background: var(--pearl-deep);
  border-radius: 2px;
}
.dossier-sourcenote p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 0.95rem;
}
.dossier-foot {
  margin-top: 36px;
  padding-top: 24px;
  border-top: 1px solid var(--line);
}
.dossier-back {
  display: inline-block;
  text-decoration: none;
  font-weight: 700;
  color: var(--brass-deep);
  border: 1px solid var(--brass-soft);
  padding: 10px 22px;
  border-radius: 2px;
  transition: background 0.18s ease, color 0.18s ease;
}
.dossier-back:hover {
  background: var(--ink);
  color: var(--pearl);
  border-color: var(--ink);
}

/* ===================== FOOTER ===================== */
.station-footer {
  width: 100%;
  background: var(--ink);
  color: var(--pearl);
  border-top: 4px solid var(--brass);
  margin-top: 40px;
}
.station-footer-inner {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 38px 24px;
}
.footer-name {
  margin: 0 0 10px;
  font-family: var(--font-mincho), serif;
  font-size: 1.3rem;
  letter-spacing: 0.14em;
}
.footer-note {
  margin: 0 0 14px;
  max-width: 64ch;
  color: rgba(241, 237, 228, 0.78);
  font-size: 0.92rem;
  line-height: 1.8;
}
.footer-meta {
  display: flex;
  gap: 12px;
  align-items: center;
  margin: 0;
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  color: var(--brass-soft);
}

/* ===================== RESPONSIVE ===================== */
@media (max-width: 1040px) {
  .dossier-grid {
    grid-template-columns: 1fr;
  }
  .dossier-margin {
    position: static;
    border-left: none;
    border-top: 1px solid var(--line);
    padding-left: 0;
    padding-top: 24px;
    margin-top: 8px;
  }
  .margin-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 0 24px;
  }
}
@media (max-width: 760px) {
  body {
    font-size: 16px;
  }
  .directory-grid {
    grid-template-columns: 1fr;
  }
  .route-row {
    grid-template-columns: 44px 1fr;
    grid-template-areas:
      "code name"
      "code scope"
      "code status";
    row-gap: 4px;
    column-gap: 14px;
  }
  .route-code {
    grid-area: code;
  }
  .route-name {
    grid-area: name;
  }
  .route-scope {
    grid-area: scope;
  }
  .route-status {
    grid-area: status;
    justify-self: start;
    margin-top: 4px;
  }
  .nameplate-rule-inner {
    gap: 10px;
  }
  .rule-tail {
    margin-left: 0;
    width: 100%;
  }
  .lead-board {
    width: 100%;
  }
  .ledger-row {
    grid-template-columns: 76px 1fr;
  }
}