:root {
  --bg: var(--tg-theme-bg-color, #ffffff);
  --fg: var(--tg-theme-text-color, #1b1b1b);
  --muted: var(--tg-theme-hint-color, #6b6b6b);
  --accent: var(--tg-theme-button-color, #2a62a8);
  --accent-fg: var(--tg-theme-button-text-color, #ffffff);
  --panel: var(--tg-theme-secondary-bg-color, #f1f1f3);
  --danger: var(--tg-theme-destructive-text-color, #c62828);
  --safe-top: calc(var(--tg-safe-area-inset-top, 0px) + var(--tg-content-safe-area-inset-top, 0px));
  --safe-bottom: calc(var(--tg-safe-area-inset-bottom, 0px) + var(--tg-content-safe-area-inset-bottom, 0px));
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: var(--tg-theme-bg-color, #141414);
    --fg: var(--tg-theme-text-color, #e6e6e6);
    --muted: var(--tg-theme-hint-color, #9a9a9a);
    --panel: var(--tg-theme-secondary-bg-color, #222226);
    --accent: var(--tg-theme-button-color, #5b8fd6);
  }
}
:root[data-reader-theme="sepia"] #reader { --bg: #f4ecd8; --fg: #3b2f1e; --panel: #e9dfc6; --muted: #7a6a50; }
:root[data-reader-theme="light"] #reader { --bg: #ffffff; --fg: #1b1b1b; --panel: #f1f1f3; --muted: #6b6b6b; }
:root[data-reader-theme="dark"] #reader { --bg: #141414; --fg: #d4d4d4; --panel: #222226; --muted: #9a9a9a; }

* { box-sizing: border-box; }
html, body { margin: 0; height: 100%; background: var(--bg); color: var(--fg); }
body {
  font: 16px/1.4 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  -webkit-tap-highlight-color: transparent;
  overscroll-behavior: none;
}
button, .button {
  font: inherit;
  color: var(--accent);
  background: transparent;
  border: 0;
  padding: 8px 10px;
  border-radius: 8px;
  cursor: pointer;
  min-height: 40px;
}
button:focus-visible, .button:focus-visible, input:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
button.primary, .button.primary { background: var(--accent); color: var(--accent-fg); font-weight: 600; }
button.danger { color: var(--danger); }
.visually-hidden { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }

.screen { position: fixed; inset: 0; display: flex; flex-direction: column; background: var(--bg); }
.screen[hidden] { display: none; }
.bar { display: flex; align-items: center; gap: 4px; padding: 4px 8px; }
#library .bar { padding-top: calc(var(--safe-top) + 8px); }
#library h1 { flex: 1; font-size: 22px; margin: 0 8px; }

.banner { margin: 8px 16px; padding: 12px; background: var(--panel); border-radius: 12px; }
.banner p { margin: 0 0 8px; }
.books { list-style: none; margin: 0; padding: 0 8px; overflow-y: auto; flex: 1; }
.book { display: flex; align-items: center; border-bottom: 1px solid color-mix(in srgb, var(--fg) 12%, transparent); }
.book-open { flex: 1; text-align: left; color: var(--fg); display: flex; flex-direction: column; padding: 12px 8px; }
.book-title { font-weight: 600; }
.book-author, .book-meta { color: var(--muted); font-size: 14px; }
.book-remove { color: var(--muted); font-size: 14px; }
.empty { color: var(--muted); text-align: center; padding: 32px 24px; flex: 1; }
.add { padding: 12px 16px calc(var(--safe-bottom) + 16px); display: flex; flex-direction: column; align-items: center; gap: 8px; }
.add-hint { color: var(--muted); font-size: 13px; text-align: center; max-width: 480px; margin: 0; }
.add-hint p { margin: 0 0 6px; }
.add-hint[hidden] { display: none; }
@media (pointer: coarse) { .drop-hint { display: none; } }
body.dragging #library { outline: 3px dashed var(--accent); outline-offset: -8px; }
.add .button { display: inline-flex; align-items: center; padding: 12px 24px; }

#reader .top { padding-top: calc(var(--safe-top) + 2px); }
#reader .top .title { flex: 1; overflow: hidden; white-space: nowrap; text-overflow: ellipsis; font-weight: 600; text-align: center; }
#reader .bottom { padding-bottom: calc(var(--safe-bottom) + 2px); font-size: 13px; color: var(--muted); }
#reader .bottom .status { flex: 1; display: flex; flex-direction: column; align-items: center; text-align: center; overflow: hidden; }
#reader .bottom .status span { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; max-width: 100%; }
#r-chapter { color: var(--fg); }
.viewer { flex: 1; position: relative; overflow: hidden; }
.tb-frame { position: absolute; inset: 0; border: 0; display: block; width: 100%; height: 100%; background: transparent; }
body.immersive #reader .bar { display: none; }
body.immersive #reader { padding-top: var(--safe-top); padding-bottom: var(--safe-bottom); }

.modal { position: fixed; inset: 0; background: rgb(0 0 0 / 45%); display: flex; align-items: flex-end; justify-content: center; z-index: 10; }
.modal[hidden] { display: none; }
.sheet {
  background: var(--bg); color: var(--fg); width: 100%; max-width: 560px; max-height: 85vh; overflow-y: auto;
  border-radius: 16px 16px 0 0; padding: 16px 16px calc(var(--safe-bottom) + 16px);
}
.sheet h2 { margin: 0 0 8px; font-size: 18px; }
.sheet .actions { display: flex; flex-wrap: wrap; justify-content: flex-end; gap: 8px; margin-top: 16px; }
.form { display: flex; flex-direction: column; gap: 6px; }
.form label, .form .label { font-size: 14px; color: var(--muted); margin-top: 6px; }
.form input { font: inherit; padding: 10px; border-radius: 8px; border: 1px solid color-mix(in srgb, var(--fg) 25%, transparent); background: var(--panel); color: var(--fg); }
.form .hint { font-size: 13px; color: var(--muted); margin: 4px 0 0; }
.form .error { color: var(--danger); margin: 4px 0 0; min-height: 1em; }
.seg { display: flex; gap: 6px; align-items: center; flex-wrap: wrap; }
.seg button { background: var(--panel); color: var(--fg); min-width: 48px; }
.seg button[aria-pressed="true"] { background: var(--accent); color: var(--accent-fg); }
.seg output { min-width: 32px; text-align: center; }
.toc { list-style: none; margin: 0; padding: 0; }
.toc-item { width: 100%; text-align: left; color: var(--fg); padding: 10px 8px; }
.toc-item.depth-1 { padding-left: 24px; }
.toc-item.depth-2 { padding-left: 40px; }
.toc-item.depth-3 { padding-left: 56px; }
.toast {
  position: fixed; left: 50%; transform: translateX(-50%); top: calc(var(--safe-top) + 56px);
  max-width: min(92vw, 520px); background: color-mix(in srgb, var(--fg) 88%, transparent); color: var(--bg);
  padding: 10px 14px; border-radius: 10px; z-index: 20; font-size: 14px; text-align: center;
}
.toast[hidden] { display: none; }