/* Reader — three reading themes, quiet chrome, long-form comfort. */

body.reading {
  --read-size: 1.18rem;
  background: var(--rbg);
  color: var(--rfg);
  transition: background 0.5s var(--ease), color 0.5s var(--ease);
}

body[data-theme='night'] {
  --rbg: #07090a; --rbg-2: #0d1113; --rfg: #dce6e1; --rfg-dim: #8b9c97;
  --rline: rgba(214, 232, 226, 0.12); --raccent: #d8c48a;
}
body[data-theme='dusk'] {
  --rbg: #16141a; --rbg-2: #1d1a22; --rfg: #e4dcd0; --rfg-dim: #a2988c;
  --rline: rgba(228, 220, 208, 0.14); --raccent: #d8b98a;
}
body[data-theme='paper'] {
  --rbg: #f3f0e9; --rbg-2: #eae6dd; --rfg: #1d1f1e; --rfg-dim: #5c625f;
  --rline: rgba(29, 31, 30, 0.14); --raccent: #8a6f2f;
}

/* progress */
.progress { position: fixed; inset: 0 0 auto 0; height: 2px; background: transparent; z-index: 80; }
.progress span { display: block; height: 100%; width: 0; background: var(--raccent); transition: width 0.15s linear; }

/* top bar */
.rnav {
  position: fixed; inset: 2px 0 auto 0; z-index: 70;
  display: grid; grid-template-columns: 1fr auto 1fr; align-items: center; gap: 1rem;
  padding: 0.75rem clamp(0.9rem, 3vw, 1.75rem);
  background: color-mix(in srgb, var(--rbg) 88%, transparent);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--rline);
}
#tocBtn { justify-self: start; }
.rbrand {
  display: flex; align-items: center; gap: 0.6rem; justify-self: center;
  text-decoration: none; color: var(--rfg);
  font-family: var(--font-display); letter-spacing: 0.12em; text-transform: uppercase;
  font-size: 0.82rem; white-space: nowrap;
}
.rtools { display: flex; align-items: center; gap: 0.5rem; justify-self: end; }
.seg { display: flex; border: 1px solid var(--rline); border-radius: 999px; overflow: hidden; }
.seg .icon-btn { border: 0; border-radius: 0; padding: 0.45rem 0.7rem; }
.seg .icon-btn + .icon-btn { border-left: 1px solid var(--rline); }

.icon-btn {
  display: inline-flex; align-items: center; gap: 0.45rem;
  background: transparent; border: 1px solid var(--rline); border-radius: 999px;
  color: var(--rfg-dim); font-family: var(--font-body); font-size: 0.78rem;
  letter-spacing: 0.06em; padding: 0.5rem 0.9rem; cursor: pointer;
  transition: color 0.25s var(--ease), background 0.25s var(--ease);
}
.icon-btn:hover { color: var(--rfg); background: color-mix(in srgb, var(--rfg) 8%, transparent); }
.icon-btn[aria-pressed='true'] { color: var(--raccent); }
.tiny { font-size: 0.62rem; }
.btn-sm { padding: 0.5rem 1rem; font-size: 0.78rem; }

@media (max-width: 900px) {
  .rbrand span { display: none; }
  .rtools .seg:first-of-type { display: none; }
}
@media (max-width: 640px) {
  .rtools .seg { display: none; }
  #tocBtn span { display: none; }
}

/* contents drawer */
.toc {
  position: fixed; top: 0; left: 0; bottom: 0; width: min(360px, 86vw); z-index: 90;
  background: var(--rbg-2); border-right: 1px solid var(--rline);
  transform: translateX(-102%); transition: transform 0.45s var(--ease);
  display: flex; flex-direction: column;
}
.toc.open { transform: none; }
.toc-head {
  display: flex; align-items: center; justify-content: space-between;
  padding: 1.1rem 1.25rem; border-bottom: 1px solid var(--rline);
}
.toc-title { font-family: var(--font-display); letter-spacing: 0.22em; text-transform: uppercase; font-size: 0.8rem; margin: 0; color: var(--rfg-dim); }
.toc nav { overflow-y: auto; padding: 0.75rem 0 3rem; }
.toc .part {
  font-family: var(--font-display); font-size: 0.78rem; letter-spacing: 0.28em;
  text-transform: uppercase; color: var(--raccent);
  padding: 1.4rem 1.35rem 0.5rem;
}
.toc a {
  display: block; padding: 0.55rem 1.35rem; text-decoration: none;
  color: var(--rfg-dim); font-size: 0.92rem; line-height: 1.4;
  border-left: 2px solid transparent;
  transition: color 0.2s var(--ease), background 0.2s var(--ease);
}
.toc a:hover { color: var(--rfg); background: color-mix(in srgb, var(--rfg) 6%, transparent); }
.toc a.current { color: var(--rfg); border-left-color: var(--raccent); }
.toc a small { display: block; color: var(--rfg-dim); opacity: 0.7; font-size: 0.72rem; letter-spacing: 0.08em; text-transform: uppercase; }

.scrim { position: fixed; inset: 0; background: rgba(0, 0, 0, 0.55); z-index: 85; backdrop-filter: blur(2px); }

/* the page */
.page { width: min(100% - 2.5rem, 40rem); margin: 0 auto; padding: 7.5rem 0 6rem; }

.chapter .part-label {
  font-family: var(--font-display); font-size: 0.8rem; letter-spacing: 0.34em;
  text-transform: uppercase; color: var(--raccent); margin: 0 0 1.25rem;
}
.chapter h1 {
  font-family: var(--font-display); font-weight: 300;
  font-size: clamp(2rem, 5.5vw, 3.1rem); line-height: 1.08; margin: 0 0 0.5rem;
}
.chapter .cnum {
  font-family: var(--font-display); font-size: 1rem; letter-spacing: 0.2em;
  text-transform: uppercase; color: var(--rfg-dim); margin: 0 0 2.5rem;
}
.chapter .rule { width: 64px; height: 1px; background: var(--rline); margin: 0 0 3rem; }

.chapter p {
  font-family: var(--font-read); font-size: var(--read-size);
  line-height: 1.78; margin: 0 0 1.5rem; color: var(--rfg);
  text-wrap: pretty;
}
.chapter p em { font-style: italic; }
.chapter p.q {
  font-style: italic; color: var(--rfg-dim);
  border-left: 1px solid var(--rline); padding-left: 1.5rem;
  margin-left: 0; margin-bottom: 1.25rem;
}
.chapter p.first::first-letter {
  font-family: var(--font-display); float: left; font-size: 3.6em;
  line-height: 0.82; padding: 0.06em 0.1em 0 0; font-weight: 300; color: var(--raccent);
}
.chapter .sep { display: block; text-align: center; color: var(--rfg-dim); letter-spacing: 0.9em; margin: 2.5rem 0 2.75rem; }
.chapter .sep::before { content: '· · ·'; }

/* chapter nav */
.chapter-nav {
  display: flex; align-items: center; justify-content: space-between; gap: 1rem;
  margin-top: 4.5rem; padding-top: 2rem; border-top: 1px solid var(--rline);
}
.chapter-nav .btn { border-color: var(--rline); color: var(--rfg); }
.chapter-nav .btn:hover { border-color: var(--raccent); background: color-mix(in srgb, var(--raccent) 10%, transparent); }
.chapter-nav .btn[disabled] { opacity: 0.35; pointer-events: none; }
.cnav-mid { font-size: 0.75rem; letter-spacing: 0.18em; text-transform: uppercase; color: var(--rfg-dim); text-align: center; }

.end-card {
  margin-top: 4rem; padding: 3rem 2rem; text-align: center;
  border: 1px solid var(--rline); background: var(--rbg-2);
}
.end-card h2 { font-family: var(--font-display); font-weight: 300; font-size: 2rem; margin: 0 0 1rem; }
.end-card p { color: var(--rfg-dim); max-width: 46ch; margin: 0 auto; font-family: var(--font-read); }
.end-card .kicker { color: var(--raccent); }

/* loading */
.loading { position: fixed; inset: 0; display: grid; place-content: center; grid-auto-flow: column; gap: 0.5rem; background: var(--rbg); z-index: 95; transition: opacity 0.4s var(--ease); }
.loading[hidden] { display: none; }
.loading span { width: 7px; height: 7px; border-radius: 50%; background: var(--raccent); opacity: 0.3; animation: pulse 1.2s infinite; }
.loading span:nth-child(2) { animation-delay: 0.15s; }
.loading span:nth-child(3) { animation-delay: 0.3s; }
@keyframes pulse { 0%, 100% { opacity: 0.25; transform: translateY(0); } 50% { opacity: 1; transform: translateY(-4px); } }

@media (prefers-reduced-motion: reduce) {
  .toc, .loading span, .progress span { transition: none; animation: none; }
}