:root {
  --ink: #121212;
  --muted: #5a5a5a;
  --paper: #f4f4f1;
  --panel: #ffffff;
  --line: #121212;
  --fill: #1c1c1c;
  --fill-text: #f4f4f1;
  --danger: #8a1f1f;
  --font-ui: "IBM Plex Sans JP", "Hiragino Sans", sans-serif;
  --font-story: "Shippori Mincho", "Hiragino Mincho ProN", serif;
}

* {
  box-sizing: border-box;
}

[hidden] {
  display: none !important;
}

html,
body {
  margin: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;
}

body {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-ui);
  -webkit-font-smoothing: antialiased;
  overscroll-behavior: none;
}

button,
input {
  font: inherit;
}

.gate,
.library,
.reader {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
}

.gate {
  display: grid;
  place-items: center;
  padding: 1.25rem;
  overflow: auto;
  background:
    linear-gradient(#121212 0 2px, transparent 2px) 0 0 / 100% 48px,
    linear-gradient(90deg, #121212 0 2px, transparent 2px) 0 0 / 48px 100%,
    var(--paper);
}

.gate-panel {
  width: min(100%, 26rem);
  background: var(--panel);
  border: 2px solid var(--line);
  padding: 1.5rem 1.25rem;
}

.gate-kicker,
.eyebrow {
  margin: 0 0 0.75rem;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.18em;
}

.gate-title,
.library-header h1 {
  margin: 0;
  font-family: var(--font-story);
  font-size: clamp(1.6rem, 5.5vw, 2.1rem);
  font-weight: 600;
  line-height: 1.35;
  letter-spacing: 0.04em;
}

.gate-text,
.library-lead {
  margin: 0.75rem 0 0;
  color: var(--muted);
  line-height: 1.65;
  font-size: 0.92rem;
}

.gate-form {
  display: grid;
  gap: 0.55rem;
  margin-top: 1.25rem;
}

.gate-form label {
  font-size: 0.78rem;
  letter-spacing: 0.08em;
}

.gate-form input {
  border: 2px solid var(--line);
  border-radius: 0;
  background: var(--paper);
  padding: 0.75rem;
}

.gate-form button,
.text-btn {
  border-radius: 0;
  cursor: pointer;
}

.gate-form button {
  border: 2px solid var(--fill);
  background: var(--fill);
  color: var(--fill-text);
  padding: 0.8rem 1rem;
  font-weight: 500;
  letter-spacing: 0.08em;
}

.gate-error,
.gate-setup,
.setup-warning {
  margin: 0.75rem 0 0;
  color: var(--danger);
  font-size: 0.88rem;
  line-height: 1.55;
}

.gate-help {
  margin: 0.9rem 0 0;
  color: var(--muted);
  font-size: 0.8rem;
  line-height: 1.65;
}

.gate-help code {
  font-family: ui-monospace, monospace;
  font-size: 0.76rem;
}

.library {
  overflow: auto;
  overscroll-behavior: contain;
  -webkit-overflow-scrolling: touch;
}

.library-inner {
  width: min(100%, 42rem);
  margin: 0 auto;
  padding: 1.5rem 1.1rem 2rem;
}

.library-header {
  border-bottom: 2px solid var(--line);
  padding-bottom: 1rem;
}

.library-top {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 1rem;
  margin-bottom: 0.75rem;
}

.library-top .eyebrow {
  margin: 0;
}

.library-back {
  color: inherit;
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  text-decoration: none;
}

.library-back:hover,
.library-back:focus-visible {
  text-decoration: underline;
  text-underline-offset: 0.2em;
}

.toc {
  margin-top: 1.25rem;
}

.toc-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 1rem;
  border-bottom: 1px solid var(--line);
  padding-bottom: 0.55rem;
}

.toc-head h2 {
  margin: 0;
  font-size: 0.9rem;
  font-weight: 600;
  letter-spacing: 0.16em;
}

.toc-head p {
  margin: 0;
  color: var(--muted);
  font-size: 0.82rem;
}

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

.toc-list li {
  border-bottom: 1px solid #cfcfc8;
}

.toc-list a {
  display: grid;
  grid-template-columns: 2.6rem 1fr auto;
  gap: 0.75rem;
  align-items: start;
  padding: 1rem 0.1rem;
  color: inherit;
  text-decoration: none;
}

.toc-list a:hover,
.toc-list a:focus-visible {
  background: #ecece7;
}

.toc-num {
  font-variant-numeric: tabular-nums;
  font-weight: 600;
  letter-spacing: 0.04em;
}

.toc-title {
  margin: 0;
  font-family: var(--font-story);
  font-size: 1.1rem;
  font-weight: 600;
  letter-spacing: 0.04em;
}

.toc-meta {
  margin: 0.3rem 0 0;
  color: var(--muted);
  font-size: 0.84rem;
  line-height: 1.55;
}

.toc-go {
  font-size: 0.82rem;
  letter-spacing: 0.08em;
  align-self: center;
}

.reader {
  display: grid;
  grid-template-rows: auto minmax(0, 1fr);
  background: var(--panel);
  overflow: hidden;
}

.reader-bar {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 0.75rem;
  border-bottom: 2px solid var(--line);
  padding: 0.7rem 0.9rem;
  background: var(--panel);
}

.text-btn {
  border: 2px solid var(--line);
  background: var(--paper);
  color: var(--ink);
  padding: 0.45rem 0.8rem;
  letter-spacing: 0.06em;
  font-size: 0.84rem;
  font-weight: 600;
  justify-self: start;
}

.text-btn:hover,
.text-btn:focus-visible {
  background: var(--fill);
  color: var(--fill-text);
}

.progress {
  margin: 0;
  font-size: 0.82rem;
  letter-spacing: 0.08em;
  justify-self: center;
}

.bar-spacer {
  justify-self: end;
  width: 3.5rem;
}

.stage {
  min-height: 0;
  overflow: auto;
  overscroll-behavior: contain;
  -webkit-overflow-scrolling: touch;
  padding: 1rem 0.9rem calc(1.5rem + env(safe-area-inset-bottom));
}

.page {
  width: min(100%, 40rem);
  margin: 0 auto;
  border: 2px solid var(--line);
  background: var(--paper);
  padding: 1.35rem 1.15rem 1.5rem;
}

.kicker {
  margin: 0 0 0.7rem;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.16em;
  color: var(--muted);
}

.kicker:empty {
  display: none;
}

.title {
  margin: 0;
  font-family: var(--font-story);
  font-size: clamp(1.45rem, 5vw, 2rem);
  font-weight: 600;
  line-height: 1.4;
  letter-spacing: 0.04em;
}

.byline {
  margin: 0.7rem 0 0;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--line);
  font-size: 0.9rem;
  letter-spacing: 0.12em;
  color: var(--muted);
}

.body {
  display: grid;
  gap: 1rem;
  margin-top: 1.15rem;
  font-family: var(--font-story);
  font-size: clamp(1.02rem, 3vw, 1.14rem);
  line-height: 1.95;
  letter-spacing: 0.03em;
}

.body p {
  margin: 0;
}

.body .quote {
  padding-left: 0.75rem;
  border-left: 3px solid var(--ink);
}

.body .section-heading {
  margin: 1.25rem 0 0.25rem;
  padding-top: 1rem;
  border-top: 1px solid var(--line);
  font-family: var(--font-ui);
  font-size: 0.9rem;
  font-weight: 600;
  letter-spacing: 0.18em;
}

.end-mark {
  margin: 1.75rem 0 0;
  padding-top: 1rem;
  border-top: 1px solid var(--line);
  font-size: 0.85rem;
  letter-spacing: 0.18em;
  color: var(--muted);
}

.origin {
  margin: 1.5rem 0 0;
  padding-top: 1.15rem;
  border-top: 1px solid var(--line);
}

.origin-label {
  margin: 0;
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  color: var(--muted);
}

.origin-row {
  display: flex;
  align-items: center;
  gap: 1.15rem;
  margin-top: 0.85rem;
}

.origin-image {
  width: 16rem;
  height: 16rem;
  flex: 0 0 auto;
  display: block;
  object-fit: contain;
  border: 2px solid var(--line);
  background: transparent;
}

.origin-text {
  min-width: 0;
  text-align: left;
}

.origin-name {
  margin: 0;
  font-family: var(--font-story);
  font-size: 1.15rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  line-height: 1.45;
}

.origin-epithet {
  margin: 0.4rem 0 0;
  color: var(--muted);
  font-size: 0.88rem;
  letter-spacing: 0.06em;
  line-height: 1.6;
}

.to-toc-end {
  margin-top: 1.5rem;
}

@media (max-width: 560px) {
  .toc-list a {
    grid-template-columns: 2.2rem 1fr;
  }

  .toc-go {
    display: none;
  }

  .page {
    padding: 1.1rem 0.95rem 1.25rem;
  }

  .origin-image {
    width: 11rem;
    height: 11rem;
  }

  .text-btn {
    padding: 0.4rem 0.65rem;
    font-size: 0.8rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  * {
    scroll-behavior: auto !important;
  }
}