/* ==========================================================================
   仁木文庫データベース化プロジェクト — style.css
   Design tokens per DESIGN.md §4
   ========================================================================== */

:root {
  --paper: #FDFBF7;
  --paper-band: #F4EFE4;
  --ink: #211E1A;
  --ink-soft: #5B564C;
  --indigo: #1E4258;
  --indigo-deep: #122B3B;
  --shu: #A8432B;
  --line: #DFD8C8;

  --font-display: "Shippori Mincho", "Hiragino Mincho ProN", serif;
  --font-body: "Zen Kaku Gothic New", "Hiragino Kaku Gothic ProN", sans-serif;

  --fs-body: 1.15rem;
  --fs-lead: 1.375rem;
  --fs-caption: 0.9rem;
  --fs-h3: 1.75rem;
  --fs-h2: clamp(2rem, 4vw, 2.75rem);
  --fs-h1: clamp(2.5rem, 5vw, 4.25rem);

  --measure: 38em;
  --rail-width: 3.25rem;
  --container: 46rem;

  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #14181B;
    --paper-band: #1C2226;
    --ink: #ECE7DC;
    --ink-soft: #B3AC9C;
    --indigo: #6FA0BE;
    --indigo-deep: #9FC4DA;
    --shu: #E08461;
    --line: #33393D;
  }
}

:root[data-theme="dark"] {
  --paper: #14181B;
  --paper-band: #1C2226;
  --ink: #ECE7DC;
  --ink-soft: #B3AC9C;
  --indigo: #6FA0BE;
  --indigo-deep: #9FC4DA;
  --shu: #E08461;
  --line: #33393D;
}

:root[data-theme="light"] {
  --paper: #FDFBF7;
  --paper-band: #F4EFE4;
  --ink: #211E1A;
  --ink-soft: #5B564C;
  --indigo: #1E4258;
  --indigo-deep: #122B3B;
  --shu: #A8432B;
  --line: #DFD8C8;
}

/* --------------------------------------------------------------------------
   Reset & base
   -------------------------------------------------------------------------- */

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

html {
  scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: var(--fs-body);
  line-height: 1.9;
  -webkit-font-smoothing: antialiased;
  padding-left: var(--rail-width);
}

img { max-width: 100%; display: block; }

a {
  color: var(--indigo);
  text-underline-offset: 0.2em;
  text-decoration-thickness: 1px;
}
a:hover { color: var(--indigo-deep); }

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 600;
  line-height: 1.4;
  text-wrap: balance;
  margin: 0 0 0.6em;
  color: var(--ink);
}

p { margin: 0 0 1.25em; }
p:last-child { margin-bottom: 0; }

:focus-visible {
  outline: 2px solid var(--shu);
  outline-offset: 3px;
}

.visually-hidden {
  position: absolute;
  width: 1px; height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

/* --------------------------------------------------------------------------
   Layout primitives
   -------------------------------------------------------------------------- */

.container {
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: 1.5rem;
}

.section {
  padding-block: clamp(4rem, 9vw, 7rem);
  border-bottom: 1px solid var(--line);
}

.section:last-of-type { border-bottom: none; }

.section--band {
  background: var(--paper-band);
}

.section-eyebrow {
  display: block;
  font-family: var(--font-body);
  font-size: var(--fs-caption);
  letter-spacing: 0.18em;
  color: var(--indigo);
  margin-bottom: 1rem;
}

.section-lead {
  font-size: var(--fs-lead);
  color: var(--ink-soft);
  max-width: var(--measure);
}

.prose { max-width: var(--measure); }
.prose h3 { font-size: var(--fs-h3); margin-top: 2em; }
.prose > * + * { margin-top: 1.25em; }

/* --------------------------------------------------------------------------
   Spine rail — book-spine index / scroll progress
   -------------------------------------------------------------------------- */

.spine-rail {
  position: fixed;
  inset: 0 auto 0 0;
  width: var(--rail-width);
  background: var(--indigo);
  z-index: 40;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding-block: 1.25rem;
}

.spine-rail__progress {
  position: absolute;
  inset: 0 auto 0 0;
  width: 3px;
  background: var(--shu);
  height: 0%;
  transition: height 0.15s var(--ease);
}

.spine-rail__mark {
  writing-mode: vertical-rl;
  text-orientation: mixed;
  font-family: var(--font-display);
  font-size: 0.95rem;
  letter-spacing: 0.28em;
  color: #F4EFE4;
  opacity: 0.85;
  white-space: nowrap;
}

.spine-rail__label {
  writing-mode: vertical-rl;
  text-orientation: mixed;
  font-family: var(--font-body);
  font-size: 0.75rem;
  letter-spacing: 0.15em;
  color: #F4EFE4;
  opacity: 0.65;
  margin-top: auto;
}

/* --------------------------------------------------------------------------
   Hero
   -------------------------------------------------------------------------- */

.hero {
  min-height: 88vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding-block: 6rem 4rem;
  position: relative;
}

.hero__eyebrow {
  font-size: var(--fs-caption);
  letter-spacing: 0.2em;
  color: var(--ink-soft);
  margin-bottom: 1.5rem;
}

.hero__title {
  font-size: var(--fs-h1);
  letter-spacing: 0.02em;
}

.hero__title small {
  display: block;
  font-family: var(--font-body);
  font-size: 0.32em;
  font-weight: 500;
  letter-spacing: 0.08em;
  color: var(--ink-soft);
  margin-top: 0.8em;
}

.hero__lead {
  font-size: var(--fs-lead);
  color: var(--ink-soft);
  max-width: var(--measure);
  margin-top: 1.5rem;
}

.hero__meta {
  margin-top: 3rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.5rem;
  font-size: var(--fs-caption);
  color: var(--ink-soft);
  border-top: 1px solid var(--line);
  padding-top: 1.5rem;
  max-width: var(--measure);
}

.hero__meta span { white-space: nowrap; }

.hero__scroll {
  margin-top: 3rem;
  font-size: var(--fs-caption);
  color: var(--ink-soft);
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.hero__scroll::after {
  content: "";
  width: 1px;
  height: 3rem;
  background: var(--ink-soft);
}

.hero__logo {
  display: inline-flex;
  padding: 0.6rem 1rem;
  border: 1px solid var(--line);
  background: var(--paper);
  margin-bottom: 2rem;
}

.hero__logo img {
  height: 2.25rem;
  width: auto;
  display: block;
}

/* --------------------------------------------------------------------------
   Figure — 史料写真＋キャプション
   -------------------------------------------------------------------------- */

.figure {
  margin: 0;
}

.figure img {
  border: 1px solid var(--line);
}

.figure__caption {
  margin-top: 0.6rem;
  font-size: var(--fs-caption);
  color: var(--ink-soft);
  line-height: 1.6;
}

.figure-row {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2rem 1.5rem;
  margin-top: 3rem;
  max-width: 52rem;
}

@media (min-width: 720px) {
  .figure-row { grid-template-columns: repeat(4, 1fr); }
}

.figure-row img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

/* --------------------------------------------------------------------------
   Table of contents — 蔵書目録を思わせる索引
   -------------------------------------------------------------------------- */

.toc {
  padding-block: clamp(2.5rem, 6vw, 4rem);
  border-bottom: 1px solid var(--line);
}

.toc__caption {
  font-size: var(--fs-caption);
  letter-spacing: 0.18em;
  color: var(--indigo);
  display: block;
  margin-bottom: 1.5rem;
}

.toc__list {
  list-style: none;
  margin: 0;
  padding: 0;
  max-width: var(--measure);
}

.toc__list li {
  border-bottom: 1px dotted var(--line);
}

.toc__list a {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.85rem 0;
  color: var(--ink);
  text-decoration: none;
  font-family: var(--font-display);
  font-size: 1.1rem;
}

.toc__list a:hover { color: var(--indigo); }

.toc__num {
  font-family: var(--font-body);
  font-size: var(--fs-caption);
  color: var(--ink-soft);
  flex-shrink: 0;
}

/* --------------------------------------------------------------------------
   Timeline (年表) — used where content is genuinely chronological
   -------------------------------------------------------------------------- */

.timeline {
  list-style: none;
  margin: 3rem 0 0;
  padding: 0;
  max-width: var(--measure);
  position: relative;
}

.timeline::before {
  content: "";
  position: absolute;
  top: 0.5em;
  bottom: 0.5em;
  left: 6.5rem;
  width: 1px;
  background: var(--line);
}

.timeline__item {
  position: relative;
  display: grid;
  grid-template-columns: 6rem 1fr;
  gap: 1.5rem;
  padding-bottom: 3rem;
}

.timeline__item:last-child { padding-bottom: 0; }

.timeline__date {
  font-family: var(--font-display);
  font-size: 1.05rem;
  color: var(--indigo);
  padding-top: 0.1em;
  text-align: right;
}

.timeline__item::after {
  content: "";
  position: absolute;
  left: 6.5rem;
  top: 0.35em;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--shu);
  transform: translateX(-4.5px);
}

.timeline__body h3 {
  font-size: 1.3rem;
  margin-bottom: 0.4em;
}

.timeline__body p {
  color: var(--ink-soft);
}

/* --------------------------------------------------------------------------
   Stamp quote — 蔵書印を思わせる強調引用（朱色は最小限に）
   -------------------------------------------------------------------------- */

.stamp-quote {
  border-left: 2px solid var(--shu);
  padding: 0.25em 0 0.25em 1.75rem;
  margin: 2.5rem 0;
  max-width: var(--measure);
}

.stamp-quote p {
  font-family: var(--font-display);
  font-size: 1.5rem;
  line-height: 1.7;
  color: var(--ink);
}

.stamp-quote cite {
  display: block;
  margin-top: 0.75rem;
  font-style: normal;
  font-size: var(--fs-caption);
  color: var(--ink-soft);
}

/* --------------------------------------------------------------------------
   Archive card — 蔵書資料カード（分類番号・書誌情報・スキャン画像）
   -------------------------------------------------------------------------- */

.archive-card {
  display: grid;
  gap: 1.5rem;
  padding-top: 2.5rem;
  margin-top: 2.5rem;
  border-top: 1px solid var(--line);
  max-width: 42rem;
}

.archive-card:first-of-type {
  margin-top: 3rem;
}

@media (min-width: 640px) {
  .archive-card {
    grid-template-columns: 11rem 1fr;
    max-width: none;
  }
}

.archive-card__scan {
  border: 1px solid var(--line);
  width: 100%;
  display: block;
}

.archive-card__tag {
  display: inline-block;
  font-size: var(--fs-caption);
  letter-spacing: 0.08em;
  color: var(--shu);
  border: 1px solid var(--shu);
  padding: 0.15em 0.6em;
  margin-bottom: 0.75rem;
}

.archive-card__meta {
  font-size: var(--fs-caption);
  color: var(--ink-soft);
  margin: 0 0 1rem;
  line-height: 1.8;
}

.archive-card__meta dt { display: inline; font-weight: 500; color: var(--ink); }
.archive-card__meta dd { display: inline; margin: 0 1.25em 0 0.35em; }

.archive-card h3 {
  font-size: 1.25rem;
  margin-bottom: 0.6em;
}

.archive-card__note {
  font-size: 0.95rem;
  color: var(--ink-soft);
}

.archive-card__note strong {
  color: var(--ink);
  font-weight: 500;
}

/* --------------------------------------------------------------------------
   Classification list — 分類番号・入力項目の索引
   -------------------------------------------------------------------------- */

.classification {
  margin-top: 4rem;
  padding-top: 3rem;
  border-top: 1px solid var(--line);
  display: grid;
  gap: 2.5rem;
  max-width: var(--measure);
}

@media (min-width: 640px) {
  .classification { grid-template-columns: 1fr 1fr; max-width: none; }
}

.classification h3 {
  font-size: 1.1rem;
  letter-spacing: 0.05em;
  margin-bottom: 1rem;
}

.classification-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.classification-list li {
  display: flex;
  gap: 0.75rem;
  padding: 0.6rem 0;
  border-bottom: 1px dotted var(--line);
  color: var(--ink-soft);
}

.classification-list li:first-child { padding-top: 0; }

.classification-list em {
  font-style: normal;
  font-family: var(--font-display);
  color: var(--indigo);
  flex-shrink: 0;
}

/* --------------------------------------------------------------------------
   Question list — 仁木文庫が問うもの
   -------------------------------------------------------------------------- */

.question-list {
  list-style: none;
  margin: 3rem 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  max-width: var(--measure);
}

.question-list li {
  background: var(--paper);
  padding: 1.5rem 1.75rem;
  font-family: var(--font-display);
  font-size: 1.2rem;
  color: var(--ink);
}

.question-list li::before {
  content: "問い　";
  font-family: var(--font-body);
  font-size: var(--fs-caption);
  letter-spacing: 0.1em;
  color: var(--shu);
}

/* --------------------------------------------------------------------------
   Contrast pair — ピーター・ティール対比ブロック
   -------------------------------------------------------------------------- */

.contrast {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  margin-top: 3rem;
}

@media (min-width: 640px) {
  .contrast { grid-template-columns: 1fr 1fr; }
}

.contrast__panel {
  background: var(--paper);
  padding: 2rem 2.25rem;
}

.contrast__panel--accent {
  background: var(--indigo);
  color: #FDFBF7;
}

.contrast__panel--accent h3,
.contrast__panel--accent .contrast__label { color: #FDFBF7; }

.contrast__label {
  display: block;
  font-size: var(--fs-caption);
  letter-spacing: 0.14em;
  color: var(--ink-soft);
  margin-bottom: 0.75rem;
}

.contrast__panel h3 { font-size: 1.35rem; }
.contrast__panel--accent p { color: #E7E1D2; }
.contrast__panel:not(.contrast__panel--accent) p { color: var(--ink-soft); }

/* --------------------------------------------------------------------------
   Practice grid — 研究のスタンス（毎週水曜 / 研究発表会）
   -------------------------------------------------------------------------- */

.practice-grid {
  display: grid;
  gap: 2rem;
  margin-top: 3rem;
  grid-template-columns: 1fr;
}

@media (min-width: 640px) {
  .practice-grid { grid-template-columns: repeat(2, 1fr); }
}

.practice-card {
  border-top: 2px solid var(--indigo);
  padding-top: 1.25rem;
}

.practice-card__meta {
  display: block;
  font-size: var(--fs-caption);
  letter-spacing: 0.1em;
  color: var(--indigo);
  margin-bottom: 0.6rem;
}

.practice-card h3 { font-size: 1.3rem; }
.practice-card p { color: var(--ink-soft); }

/* --------------------------------------------------------------------------
   CTA / participation section
   -------------------------------------------------------------------------- */

.cta {
  text-align: left;
}

.cta__actions {
  margin-top: 2.5rem;
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.6em;
  padding: 0.9em 1.6em;
  font-family: var(--font-body);
  font-size: 1rem;
  letter-spacing: 0.04em;
  text-decoration: none;
  border: 1px solid var(--indigo);
  transition: background 0.2s var(--ease), color 0.2s var(--ease);
}

.btn--primary {
  background: var(--indigo);
  color: #FDFBF7;
}
.btn--primary:hover { background: var(--indigo-deep); color: #FDFBF7; }

.btn--ghost {
  background: transparent;
  color: var(--indigo);
}
.btn--ghost:hover { background: var(--paper-band); color: var(--indigo-deep); }

.cta__info {
  margin-top: 2.5rem;
  padding-top: 2rem;
  border-top: 1px solid var(--line);
  font-size: var(--fs-caption);
  color: var(--ink-soft);
  display: grid;
  gap: 0.5rem;
}

/* --------------------------------------------------------------------------
   Footer
   -------------------------------------------------------------------------- */

.site-footer {
  padding: 3rem 1.5rem 4rem;
  font-size: var(--fs-caption);
  color: var(--ink-soft);
}

.site-footer .container {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 1rem;
}

/* --------------------------------------------------------------------------
   Scroll reveal
   -------------------------------------------------------------------------- */

.reveal {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
}

/* --------------------------------------------------------------------------
   Catalog page — 蔵書一覧（検索・分類フィルタ）
   -------------------------------------------------------------------------- */

.catalog-wrap {
  max-width: 56rem;
  margin-inline: auto;
  padding: clamp(3rem, 6vw, 5rem) 1.5rem 6rem;
}

.catalog-back {
  display: inline-block;
  font-size: var(--fs-caption);
  color: var(--ink-soft);
  text-decoration: none;
  margin-bottom: 2rem;
}
.catalog-back:hover { color: var(--indigo); }

.catalog-header h1 {
  font-size: clamp(2rem, 4vw, 2.75rem);
}

.catalog-header p {
  color: var(--ink-soft);
  max-width: var(--measure);
  font-size: 1.05rem;
}

.catalog-toolbar {
  position: sticky;
  top: 0;
  z-index: 20;
  background: var(--paper);
  border-bottom: 1px solid var(--line);
  padding: 1.5rem 0;
  margin: 2.5rem 0 0;
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  align-items: center;
}

.catalog-search {
  flex: 1 1 16rem;
  font-family: var(--font-body);
  font-size: 1.05rem;
  padding: 0.6em 0.8em;
  border: 1px solid var(--line);
  background: var(--paper);
  color: var(--ink);
}
.catalog-search:focus-visible { outline: 2px solid var(--shu); outline-offset: 1px; }

.catalog-filter {
  font-family: var(--font-body);
  font-size: 0.95rem;
  padding: 0.6em 0.8em;
  border: 1px solid var(--line);
  background: var(--paper);
  color: var(--ink);
}

.catalog-count {
  font-size: var(--fs-caption);
  color: var(--ink-soft);
  white-space: nowrap;
}

.catalog-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.catalog-item {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.9rem;
  padding: 1.75rem 0;
  border-bottom: 1px dotted var(--line);
}

@media (min-width: 640px) {
  .catalog-item--with-img {
    grid-template-columns: 5.5rem 1fr;
  }
}

.catalog-item__thumb {
  width: 5.5rem;
  height: 5.5rem;
  object-fit: cover;
  border: 1px solid var(--line);
}

.catalog-item__cls {
  font-size: var(--fs-caption);
  color: var(--indigo);
  letter-spacing: 0.04em;
  margin-bottom: 0.35rem;
}

.catalog-item__meta {
  font-size: var(--fs-caption);
  color: var(--ink-soft);
  margin-bottom: 0.4rem;
}

.catalog-item h3 {
  font-size: 1.15rem;
  margin-bottom: 0.4rem;
}

.catalog-item p {
  font-size: 0.98rem;
  color: var(--ink-soft);
  margin: 0;
}

.catalog-item p + p { margin-top: 0.4rem; }

.catalog-empty {
  padding: 3rem 0;
  color: var(--ink-soft);
  text-align: center;
}

/* --------------------------------------------------------------------------
   Login — 蔵書一覧のパスワードページ
   -------------------------------------------------------------------------- */

.login-wrap {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem 1.5rem;
}

.login-card {
  max-width: 26rem;
  width: 100%;
}

.login-card h1 {
  font-size: 1.75rem;
}

.login-card p {
  color: var(--ink-soft);
}

.login-card__error {
  border-left: 2px solid var(--shu);
  padding: 0.75rem 1rem;
  margin: 1.5rem 0;
  font-size: 0.95rem;
  color: var(--ink);
  background: var(--paper-band);
}

.login-field {
  margin-top: 2rem;
}

.login-field label {
  display: block;
  font-size: var(--fs-caption);
  color: var(--ink-soft);
  margin-bottom: 0.5rem;
}

.login-field input {
  width: 100%;
  font-family: var(--font-body);
  font-size: 1.1rem;
  padding: 0.75em 0.9em;
  border: 1px solid var(--line);
  background: var(--paper);
  color: var(--ink);
  box-sizing: border-box;
}

.login-field input:focus-visible {
  outline: 2px solid var(--shu);
  outline-offset: 1px;
}

.login-submit {
  margin-top: 1.5rem;
  width: 100%;
  justify-content: center;
  border: none;
  cursor: pointer;
}

.login-back {
  display: inline-block;
  margin-top: 2rem;
  font-size: var(--fs-caption);
  color: var(--ink-soft);
  text-decoration: none;
}
.login-back:hover { color: var(--indigo); }

/* --------------------------------------------------------------------------
   Responsive
   -------------------------------------------------------------------------- */

@media (max-width: 640px) {
  :root { --rail-width: 2.25rem; }
  .spine-rail__mark { font-size: 0.75rem; }
  .timeline::before { left: 4.25rem; }
  .timeline__item { grid-template-columns: 3.75rem 1fr; gap: 1rem; }
  .timeline__item::after { left: 4.25rem; }
  .timeline__date { font-size: 0.85rem; }
}