:root {
  --paper: #f4efe4;
  --ink: #20211e;
  --muted: #6e6c63;
  --soft: #ded6c7;
  --accent: #7e3047;
  --panel: color-mix(in srgb, var(--paper) 88%, white 12%);
  --shadow: rgba(47, 40, 28, 0.1);
  --reading-size: 19px;
  --reading-leading: 1.95;
  --reading-measure: 38em;
  --custom-page: #f4efe4;
  --custom-ink: #20211e;
  color-scheme: light;
}

:root[data-theme="sepia"] {
  --paper: #e8dcc9;
  --ink: #362a20;
  --muted: #746353;
  --soft: #d0bea5;
  --accent: #7b3f2f;
  --panel: #eee3d2;
  --shadow: rgba(65, 45, 22, 0.13);
}

:root[data-theme="night"] {
  --paper: #151917;
  --ink: #ece8dc;
  --muted: #afafa2;
  --soft: #343b35;
  --accent: #e39c87;
  --panel: #1d231f;
  --shadow: rgba(0, 0, 0, 0.32);
  color-scheme: dark;
}

:root[data-font="serif"] {
  --reading-font: "Noto Serif TC", "Source Han Serif TC", "Songti TC", "PMingLiU", serif;
}

:root[data-font="sans"] {
  --reading-font: "Noto Sans TC", "PingFang TC", "Microsoft JhengHei", sans-serif;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; background: var(--paper); }

body {
  margin: 0;
  min-width: 320px;
  background: var(--custom-page, var(--paper));
  color: var(--custom-ink, var(--ink));
  font-family: "Noto Sans TC", "PingFang TC", "Microsoft JhengHei", sans-serif;
  transition: background-color 180ms ease, color 180ms ease;
}

button, input, select { font: inherit; }

button { cursor: pointer; }

button:focus-visible, input:focus-visible, select:focus-visible, a:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 3px;
}

.skip-link {
  position: fixed;
  z-index: 10;
  top: 0.75rem;
  left: 0.75rem;
  padding: 0.65rem 0.8rem;
  background: var(--ink);
  color: var(--paper);
  transform: translateY(-200%);
}

.skip-link:focus { transform: translateY(0); }

.topbar {
  position: sticky;
  z-index: 5;
  top: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: 4.75rem;
  padding: 0.75rem clamp(1rem, 4vw, 4rem);
  border-bottom: 1px solid var(--soft);
  background: color-mix(in srgb, var(--custom-page, var(--paper)) 92%, transparent);
  backdrop-filter: blur(16px);
}

.brand { display: grid; gap: 0.1rem; color: inherit; text-decoration: none; }
.brand-kicker, .eyebrow { color: var(--accent); font-size: 0.66rem; font-weight: 800; letter-spacing: 0.14em; }
.brand-name { font-family: var(--reading-font); font-size: 1.15rem; font-weight: 700; letter-spacing: 0.08em; }
.topbar-actions { display: flex; align-items: center; gap: 0.55rem; }

.quiet-button, .settings-button, .reset-button, .filter-button, .theme-buttons button {
  min-height: 2.5rem;
  border: 1px solid var(--soft);
  border-radius: 0.35rem;
  background: transparent;
  color: inherit;
  font-size: 0.84rem;
  font-weight: 700;
}

.quiet-button, .settings-button, .reset-button { padding: 0.45rem 0.75rem; }
.settings-button { border-color: var(--accent); color: var(--accent); }
.quiet-button:hover, .settings-button:hover, .reset-button:hover, .filter-button:hover, .theme-buttons button:hover { background: var(--panel); }
.quiet-button:disabled { cursor: not-allowed; opacity: 0.42; }

.settings {
  border-bottom: 1px solid var(--soft);
  background: var(--panel);
}

.settings-inner {
  display: grid;
  grid-template-columns: minmax(12rem, 1.1fr) repeat(3, minmax(9rem, 1fr)) minmax(8rem, 0.8fr);
  gap: 1rem 1.3rem;
  align-items: end;
  max-width: 92rem;
  margin: 0 auto;
  padding: 1.15rem clamp(1rem, 4vw, 4rem) 1.35rem;
}

.settings-heading h2 { margin: 0.25rem 0 0; font-family: var(--reading-font); font-size: 1.2rem; }
.settings-heading .eyebrow { margin: 0; }
.setting-control, .setting-select, .theme-setting, .setting-color { display: grid; gap: 0.46rem; }
.setting-control span, .setting-select span, .theme-setting > span, .setting-color span { display: flex; justify-content: space-between; color: var(--muted); font-size: 0.76rem; font-weight: 800; }
.setting-control output { color: var(--accent); }
.setting-control input { accent-color: var(--accent); }
.setting-select select { min-height: 2.4rem; border: 1px solid var(--soft); border-radius: 0.35rem; background: var(--custom-page, var(--paper)); color: inherit; padding: 0 0.5rem; }
.theme-buttons { display: flex; gap: 0.35rem; }
.theme-buttons button { flex: 1; min-height: 2.35rem; padding: 0.25rem; font-size: 0.73rem; }
.theme-buttons button.is-active { border-color: var(--accent); background: var(--accent); color: #fffaf0; }
.setting-color input { width: 100%; height: 2.4rem; border: 1px solid var(--soft); border-radius: 0.35rem; background: transparent; padding: 0.15rem; }
.reset-button { align-self: end; }

.layout {
  display: grid;
  grid-template-columns: minmax(17.5rem, 25rem) minmax(0, 1fr);
  align-items: start;
  max-width: 110rem;
  min-height: calc(100vh - 4.75rem);
  margin: 0 auto;
}

.library {
  position: sticky;
  top: 4.75rem;
  height: calc(100vh - 4.75rem);
  overflow: auto;
  padding: clamp(1.3rem, 3.5vw, 3.8rem) clamp(1rem, 3.3vw, 3rem) 2rem;
  border-right: 1px solid var(--soft);
}

.library-intro h1 { margin: 0.35rem 0 0.9rem; font-family: var(--reading-font); font-size: clamp(1.55rem, 2.2vw, 2.2rem); line-height: 1.25; letter-spacing: -0.03em; }
.library-intro .eyebrow { margin: 0; }
.library-count { margin: 0; color: var(--muted); font-size: 0.82rem; line-height: 1.55; }

.search-field { display: block; margin-top: 1.5rem; }
.search-field input { width: 100%; min-height: 2.8rem; border: 1px solid var(--soft); border-radius: 0.4rem; background: var(--panel); color: inherit; padding: 0 0.75rem; }
.search-field input::placeholder { color: var(--muted); }

.collection-filter { display: flex; gap: 0.35rem; margin: 0.85rem 0 1rem; }
.filter-button { flex: 1; min-height: 2.25rem; padding: 0.25rem; font-size: 0.72rem; }
.filter-button.is-active { border-color: var(--accent); color: var(--accent); background: color-mix(in srgb, var(--accent) 11%, transparent); }

.story-list { display: grid; gap: 0.35rem; padding-bottom: 1rem; }
.story-card { display: grid; width: 100%; gap: 0.2rem; border: 1px solid transparent; border-radius: 0.45rem; background: transparent; color: inherit; padding: 0.8rem 0.7rem; text-align: left; }
.story-card:hover { background: var(--panel); }
.story-card.is-active { border-color: var(--accent); background: color-mix(in srgb, var(--accent) 9%, transparent); }
.story-card-label, .story-card-meta { color: var(--muted); font-size: 0.7rem; }
.story-card-label { color: var(--accent); font-weight: 800; letter-spacing: 0.06em; }
.story-card strong { font-family: var(--reading-font); font-size: 1rem; font-weight: 700; }
.empty-state { color: var(--muted); font-size: 0.9rem; }

.reader { min-width: 0; padding: clamp(2.4rem, 7vw, 7rem) clamp(1.1rem, 7vw, 8rem) 5rem; }
.reader-status { min-height: 1em; color: var(--muted); font-size: 0.72rem; letter-spacing: 0.08em; }
.story-header { max-width: var(--reading-measure); margin: 1.15rem auto 3.6rem; }
.story-collection { margin: 0; color: var(--accent); font-size: 0.77rem; font-weight: 800; letter-spacing: 0.1em; }
.story-header h2 { margin: 0.5rem 0 0.8rem; font-family: var(--reading-font); font-size: clamp(2.2rem, 5vw, 4.6rem); font-weight: 700; letter-spacing: -0.055em; line-height: 1.07; }
.story-meta, .story-source { margin: 0.25rem 0; color: var(--muted); font-size: 0.84rem; }
.story-source { margin-top: 1.25rem; font-size: 0.76rem; }

.story-content { max-width: var(--reading-measure); margin: 0 auto; font-family: var(--reading-font); font-size: var(--reading-size); line-height: var(--reading-leading); letter-spacing: 0.025em; }
.story-content p { margin: 0 0 calc(var(--reading-size) * 1.12); white-space: pre-line; }
.story-content .reading-chapter { margin: calc(var(--reading-size) * 3.1) 0 calc(var(--reading-size) * 1.2); color: var(--accent); font-family: var(--reading-font); font-size: 1.22em; line-height: 1.4; }
.story-content .reading-note { margin-left: 1.1em; color: var(--muted); font-size: 0.93em; }
.story-footer { display: flex; justify-content: space-between; gap: 0.75rem; max-width: var(--reading-measure); margin: 5rem auto 0; padding-top: 1.5rem; border-top: 1px solid var(--soft); }

.visually-hidden { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; clip-path: inset(50%); }

@media (max-width: 980px) {
  .settings-inner { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .settings-heading { grid-column: span 3; }
  .reset-button { width: 100%; }
  .layout { grid-template-columns: minmax(15rem, 20rem) minmax(0, 1fr); }
  .library { padding-inline: 1.25rem; }
  .reader { padding-inline: clamp(1.2rem, 5vw, 3.5rem); }
}

@media (max-width: 760px) {
  .topbar { min-height: 4.3rem; padding: 0.55rem 1rem; }
  .brand-kicker, .quiet-button#random-story { display: none; }
  .settings-button { min-height: 2.25rem; }
  .settings-inner { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1rem; padding: 1rem; }
  .settings-heading { grid-column: span 2; }
  .setting-control { grid-column: span 1; }
  .theme-setting, .reset-button { grid-column: span 2; }
  .layout { display: block; }
  .library { position: static; height: auto; overflow: visible; border-right: 0; border-bottom: 1px solid var(--soft); padding: 1.35rem 1rem 1rem; }
  .library-intro h1 { font-size: 1.6rem; }
  .story-list { display: flex; gap: 0.55rem; overflow-x: auto; padding: 0.2rem 0.05rem 0.75rem; scroll-snap-type: x proximity; }
  .story-card { flex: 0 0 min(13.2rem, 78vw); min-height: 6.2rem; scroll-snap-align: start; border-color: var(--soft); }
  .reader { padding: 2.2rem 1.1rem 3.8rem; }
  .story-header { margin-bottom: 2.7rem; }
  .story-header h2 { font-size: clamp(2.25rem, 12vw, 3.45rem); }
  .story-footer { margin-top: 3.5rem; }
}

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