/* Strata Reader (PWA) — library / home screen.
   Material 3 tokens come from material.css; this file only lays out the shell,
   the add-a-book card, the book grid and the settings sheet. Mobile-first. */

* { box-sizing: border-box; }
html, body { margin: 0; min-height: 100%; }
body {
  font-family: var(--m-font);
  background: var(--m-surface);
  color: var(--m-on-surface);
  -webkit-font-smoothing: antialiased;
  padding-bottom: env(safe-area-inset-bottom);
}
.visually-hidden {
  position: absolute; width: 1px; height: 1px; margin: -1px;
  padding: 0; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}

/* ---- app bar --------------------------------------------------------------- */
.appbar {
  position: sticky; top: 0; z-index: 5;
  display: flex; align-items: center; gap: var(--m-space-2);
  height: 56px;
  padding: 0 var(--m-space-3);
  padding-top: env(safe-area-inset-top);
  height: calc(56px + env(safe-area-inset-top));
  background: var(--m-surface-container);
  box-shadow: var(--m-elev-2);
}
.appbar-spacer { flex: 1; }
.brand { font-weight: 800; letter-spacing: .14em; font-size: 14px; color: var(--m-primary); }
.brand-sub { margin-left: 6px; color: var(--m-on-surface-variant); font-weight: 700; }

/* ---- buttons --------------------------------------------------------------- */
.btn {
  appearance: none; border: 0; cursor: pointer;
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  min-height: 40px; padding: 0 18px;
  border-radius: var(--m-radius-full);
  font: inherit; font-size: 14px; font-weight: 600;
  transition: background var(--m-dur-short) var(--m-ease-standard),
              box-shadow var(--m-dur-short) var(--m-ease-standard),
              opacity var(--m-dur-short) var(--m-ease-standard);
}
.btn.filled { background: var(--m-primary); color: var(--m-on-primary); box-shadow: var(--m-elev-1); }
.btn.filled:hover { box-shadow: var(--m-elev-2); }
.btn.tonal { background: var(--m-secondary-container); color: var(--m-on-secondary-container); }
.btn.tonal:hover { background: color-mix(in srgb, var(--m-on-secondary-container) 8%, var(--m-secondary-container)); }
.btn.text { background: transparent; color: var(--m-primary); padding: 0 12px; }
.btn.text:hover { background: color-mix(in srgb, var(--m-primary) 10%, transparent); }
.btn:disabled { opacity: .5; cursor: default; }

.iconbtn {
  appearance: none; border: 0; cursor: pointer; background: transparent;
  color: var(--m-on-surface-variant);
  width: 40px; height: 40px; display: grid; place-items: center;
  border-radius: var(--m-radius-full); font-size: 22px; line-height: 1;
  transition: background var(--m-dur-short) var(--m-ease-standard);
}
.iconbtn:hover { background: color-mix(in srgb, var(--m-on-surface) 8%, transparent); }

.field {
  appearance: none; width: 100%; min-height: 40px;
  padding: 0 14px;
  background: var(--m-surface-container-high);
  color: var(--m-on-surface);
  border: 1px solid var(--m-outline-variant);
  border-radius: var(--m-radius-sm);
  font: inherit; font-size: 14px;
}
.field:focus { outline: 2px solid var(--m-primary); outline-offset: -2px; border-color: transparent; }

/* ---- layout ---------------------------------------------------------------- */
.wrap { max-width: 1100px; margin: 0 auto; padding: var(--m-space-4) var(--m-space-3) 48px; }

.add-card {
  background: var(--m-surface-container-low);
  border-radius: var(--m-radius-lg);
  box-shadow: var(--m-elev-1);
  padding: var(--m-space-4);
  margin-bottom: var(--m-space-5);
}
.add-title { margin: 0 0 4px; font-size: 20px; font-weight: 700; }
.add-sub { margin: 0 0 16px; font-size: 13px; color: var(--m-on-surface-variant); line-height: 1.5; }
.add-actions { display: flex; flex-wrap: wrap; gap: var(--m-space-2); align-items: center; }
.url-form { display: flex; gap: var(--m-space-2); flex: 1 1 320px; min-width: 240px; }
.url-form .field { flex: 1; }
.add-note { margin-top: 12px; font-size: 13px; color: var(--m-on-surface-variant); }
.add-note.err { color: var(--m-error); }

/* ---- library grid ---------------------------------------------------------- */
.lib-head { display: flex; align-items: center; gap: var(--m-space-2); margin-bottom: var(--m-space-3); }
.lib-title { margin: 0; font-size: 16px; font-weight: 700; flex: 1; }
.lib-tools { display: flex; gap: 4px; }

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: var(--m-space-3);
}
.card {
  position: relative;
  background: var(--m-surface-container);
  border-radius: var(--m-radius-md);
  overflow: hidden;
  box-shadow: var(--m-elev-1);
  cursor: pointer;
  transition: box-shadow var(--m-dur-short) var(--m-ease-standard), transform var(--m-dur-short) var(--m-ease-standard);
}
.card:hover { box-shadow: var(--m-elev-3); transform: translateY(-2px); }
.card:focus-visible { outline: 2px solid var(--m-primary); outline-offset: 2px; }
.cover {
  display: block; width: 100%; aspect-ratio: 3 / 4;
  object-fit: cover; background: var(--m-surface-container-highest);
}
.cover-fallback {
  display: grid; place-items: center; text-align: center;
  padding: 12px; font-size: 12px; line-height: 1.35;
  color: var(--m-on-surface-variant);
  background: linear-gradient(150deg, var(--m-surface-container-high), var(--m-surface-container-highest));
}
.card-body { padding: 10px 12px 12px; }
.card-title {
  font-size: 13px; font-weight: 600; line-height: 1.35;
  display: -webkit-box; -webkit-line-clamp: 2; line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden;
}
.card-meta { margin-top: 4px; font-size: 11px; color: var(--m-on-surface-variant); }
.card-missing { color: var(--m-tertiary); font-weight: 600; }
.card-menu {
  position: absolute; top: 6px; right: 6px;
  width: 32px; height: 32px; display: grid; place-items: center;
  border: 0; border-radius: var(--m-radius-full); cursor: pointer;
  background: color-mix(in srgb, var(--m-surface) 70%, transparent);
  color: var(--m-on-surface); font-size: 18px; line-height: 1;
  backdrop-filter: blur(3px);
}
.card-menu:hover { background: var(--m-surface); }

.empty { text-align: center; padding: 40px 16px; color: var(--m-on-surface-variant); }
.empty-art { color: var(--m-outline); margin-bottom: 8px; }
.empty p { margin: 0; font-size: 14px; }

.foot {
  display: flex; align-items: center; gap: var(--m-space-2);
  margin-top: var(--m-space-5); padding-top: var(--m-space-3);
  border-top: 1px solid var(--m-outline-variant);
}
.usage { flex: 1; font-size: 12px; color: var(--m-on-surface-variant); }

/* ---- reading languages ------------------------------------------------------
   The one pair of settings that decides what the reader shows, so it lives on the
   page rather than behind the gear. The rows themselves come from settings.js and
   are styled by settings.css, shared with the sheet and the reader. */
.lang-card {
  background: var(--m-surface-container-low);
  border-radius: var(--m-radius-lg);
  box-shadow: var(--m-elev-1);
  padding: var(--m-space-4);
  margin-bottom: var(--m-space-5);
}
.lang-head { display: flex; align-items: center; gap: var(--m-space-2); }
.lang-title { margin: 0; flex: 1; font-size: 16px; font-weight: 700; }

/* ---- toast ----------------------------------------------------------------- */
.toast {
  position: fixed; left: 50%; bottom: calc(20px + env(safe-area-inset-bottom));
  transform: translateX(-50%);
  z-index: 20; max-width: min(560px, calc(100% - 32px));
  padding: 12px 18px;
  background: var(--m-inverse-surface); color: var(--m-inverse-on-surface);
  border-radius: var(--m-radius-sm); box-shadow: var(--m-elev-3);
  font-size: 13px; line-height: 1.4;
}
.toast[hidden] { display: none; }

@media (max-width: 560px) {
  .wrap { padding: var(--m-space-3) var(--m-space-3) 40px; }
  .add-card, .lang-card { padding: var(--m-space-3); }
  .grid { grid-template-columns: repeat(auto-fill, minmax(120px, 1fr)); gap: var(--m-space-2); }
  .btn.filled, .url-form { width: 100%; }
}