:root {
  --bg: #f4ede2;
  --paper: #fffaf2;
  --ink: #2c2419;
  --ink-soft: #6b5f4f;
  --accent: #a4442f;
  --accent-dark: #7e3221;
  --border: #e2d5bf;
  --gold: #c99a3f;
  --danger: #a4442f;
  --shadow: 0 4px 16px rgba(44, 36, 25, 0.12);
  --radius: 10px;
  color-scheme: light;
}

/* Shelf Wall theme — a literal wooden shelf instead of a paper grid.
   Most components (buttons, inputs, modal, tabs) already read colour from
   the tokens above, so overriding them here re-skins the whole app; only
   the grid/card layout needs its own rules further down. */
:root[data-theme="shelf"] {
  --bg: #2b1e13;
  --paper: #241a11;
  --ink: #ece0c8;
  --ink-soft: #c2ae88;
  --accent: #d9a94f;
  --accent-dark: #b8863a;
  --border: #4a3627;
  --gold: #e9c877;
  --danger: #d98a7a;
  --shadow: 0 10px 24px rgba(0, 0, 0, 0.5);
  --radius: 3px;
  color-scheme: dark;
}
[data-theme="shelf"] body {
  font-family: "Archivo", sans-serif;
  background:
    repeating-linear-gradient(90deg, rgba(0, 0, 0, 0.14) 0 3px, transparent 3px 7px),
    linear-gradient(var(--bg), #20160e);
}
[data-theme="shelf"] h1,
[data-theme="shelf"] .login-card h1,
[data-theme="shelf"] .detail-fields h2,
[data-theme="shelf"] .modal h2 {
  font-family: "Fraunces", serif;
}
[data-theme="shelf"] button.primary { color: #241a11; }

* { box-sizing: border-box; -webkit-tap-highlight-color: transparent; }

body {
  margin: 0;
  font-family: "Iowan Old Style", "Palatino Linotype", Georgia, serif;
  background: var(--bg);
  color: var(--ink);
  min-height: 100vh;
}

h1 {
  font-family: "Georgia", serif;
  font-weight: 600;
  letter-spacing: 0.02em;
  margin: 0;
}

.muted { color: var(--ink-soft); }
.center { text-align: center; margin-top: 3rem; }
[hidden] { display: none !important; }

button {
  font-family: inherit;
  font-size: 0.95rem;
  cursor: pointer;
  border: none;
  border-radius: 6px;
  padding: 0.55rem 1.1rem;
  background: var(--paper);
  color: var(--ink);
  border: 1px solid var(--border);
  transition: transform 0.08s ease, box-shadow 0.08s ease;
  touch-action: manipulation;
}
button:hover { box-shadow: var(--shadow); }
button:active { transform: translateY(1px); }
button.primary { background: var(--accent); color: #fff; border-color: var(--accent); }
button.primary:hover { background: var(--accent-dark); }
button.ghost { background: transparent; border-color: transparent; }
button.danger { background: transparent; color: var(--danger); border-color: var(--danger); }

input[type="text"], input[type="password"], input[type="date"], textarea, select {
  font-family: inherit;
  font-size: 0.95rem;
  padding: 0.55rem 0.75rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--paper);
  color: var(--ink);
  width: 100%;
}

label {
  display: block;
  font-size: 0.85rem;
  color: var(--ink-soft);
  margin-top: 0.9rem;
}
label > input, label > select, label > textarea, label > .cselect, label > .cdate { margin-top: 0.3rem; }

/* Login */
.screen { min-height: 100vh; }
#login-screen {
  display: flex;
  align-items: center;
  justify-content: center;
}
.login-card {
  background: var(--paper);
  padding: 2.5rem;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  width: min(320px, 90vw);
  text-align: center;
}
.login-card h1 { font-size: 2rem; margin-bottom: 0.3rem; }
.login-card input { margin: 1rem 0 0.75rem; }
.login-card button { width: 100%; }
.error { color: var(--danger); font-size: 0.85rem; }

/* Topbar */
.topbar {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  padding: 1.2rem 2rem;
  background: var(--paper);
  border-bottom: 1px solid var(--border);
  flex-wrap: wrap;
}
.topbar h1 { font-size: 1.5rem; color: var(--accent-dark); }
.tabs { display: flex; gap: 0.4rem; flex: 1; flex-wrap: wrap; }
.tab { border-color: transparent; background: transparent; color: var(--ink-soft); }
.tab.active { background: var(--bg); color: var(--accent-dark); border-color: var(--border); font-weight: 600; }
.topbar-actions { display: flex; align-items: center; gap: 0.5rem; }
#theme-toggle {
  width: 2.4rem;
  height: 2.4rem;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.15rem;
  line-height: 1;
  border-radius: 50%;
}

.tabs-mobile { display: none; }

@media (max-width: 640px) {
  .topbar { padding: 1rem 1.2rem; gap: 0.7rem; }
  .topbar h1 { flex-basis: 100%; }
  .tabs { display: none; }
  .tabs-mobile { display: block; flex-basis: 100%; order: 1; }
  .topbar-actions { flex-basis: 100%; justify-content: flex-end; order: 2; }
  .grid { padding: 1.25rem 1rem; gap: 1rem; }
  [data-theme="shelf"] .grid { padding: 1.75rem 1.2rem 0; }
}

/* Grid */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  gap: 1.5rem;
  padding: 2rem;
  max-width: 1200px;
  margin: 0 auto;
}
.book-card {
  cursor: pointer;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  touch-action: manipulation;
}
.book-cover {
  width: 100%;
  aspect-ratio: 2 / 3;
  object-fit: cover;
  border-radius: 4px;
  background: var(--paper);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  transition: transform 0.12s ease;
}
.book-card:hover .book-cover { transform: translateY(-3px); }
.book-cover.placeholder {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0.5rem;
  text-align: center;
  font-size: 0.8rem;
  color: var(--ink-soft);
}
.book-title { font-size: 0.9rem; font-weight: 600; line-height: 1.25; }
.book-author { font-size: 0.78rem; color: var(--ink-soft); }
.book-badge {
  align-self: flex-start;
  font-size: 0.68rem;
  padding: 0.15rem 0.5rem;
  border-radius: 999px;
  background: var(--bg);
  border: 1px solid var(--border);
  color: var(--ink-soft);
}
.book-badge.reading { color: var(--accent-dark); border-color: var(--gold); }
.book-stars { color: var(--gold); font-size: 0.8rem; letter-spacing: 1px; }

/* Shelf Wall grid: a flex row of spines standing on a ledge, instead of a
   uniform cover grid. Heights/widths/colour come from the book's own id, so
   the same book always lands on the same spot on the shelf. */
[data-theme="shelf"] .grid {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  gap: 0.5rem;
  padding: 2.5rem 2rem 0;
  max-width: 1100px;
}
[data-theme="shelf"] .grid::after {
  content: "";
  flex-basis: 100%;
  height: 16px;
  background: linear-gradient(#6b4a2c, #4a3319);
  box-shadow: 0 10px 18px rgba(0, 0, 0, 0.45);
  order: 999;
}

.spine-card {
  cursor: pointer;
  position: relative;
  display: flex;
  align-items: flex-end;
  justify-content: center;
  padding-bottom: 0.6rem;
  border-radius: 2px 2px 0 0;
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.08), 0 6px 10px rgba(0, 0, 0, 0.35);
  transition: transform 0.12s ease;
  touch-action: manipulation;
  user-select: none;
}
.spine-card:hover { transform: translateY(-4px); }
.spine-title {
  writing-mode: vertical-rl;
  transform: rotate(180deg);
  font-family: "Fraunces", serif;
  font-size: 0.76rem;
  letter-spacing: 0.01em;
  color: #f2e9d6;
  max-height: 100%;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.spine-flag {
  position: absolute;
  top: -1px; right: -1px;
  width: 0; height: 0;
  border-style: solid;
  border-width: 0 14px 14px 0;
  border-color: transparent transparent transparent transparent;
}
.spine-flag.reading { border-color: transparent #d9a94f transparent transparent; }
.spine-flag.finished { border-color: transparent #7fae7a transparent transparent; }
.spine-flag.want { border-color: transparent #8f8f8f transparent transparent; }
.spine-flag.abandoned { border-color: transparent #9a6b6b transparent transparent; }
.spine-ticks {
  position: absolute;
  bottom: 0.5rem;
  left: 50%;
  translate: -50% 0;
  display: flex;
  gap: 2px;
}
.spine-ticks i {
  width: 3px;
  height: 9px;
  background: #e9c877;
  display: block;
  border-radius: 1px;
}

/* Modals */
.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(44, 36, 25, 0.45);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  z-index: 100;
}
.modal {
  background: var(--paper);
  border-radius: var(--radius);
  padding: 2rem;
  width: min(420px, 100%);
  max-height: 90vh;
  overflow-y: auto;
  overflow-x: hidden;
  position: relative;
  box-shadow: var(--shadow);
}
.modal-close {
  position: absolute;
  top: 1rem; right: 1rem;
  border: none;
  background: none;
  font-size: 1.4rem;
  line-height: 1;
  color: var(--ink-soft);
  padding: 0.2rem 0.5rem;
}

.search-results { margin-top: 1rem; display: flex; flex-direction: column; gap: 0.5rem; max-height: 320px; overflow-y: auto; }
.search-result {
  display: flex;
  gap: 0.75rem;
  align-items: center;
  padding: 0.5rem;
  border-radius: 6px;
  cursor: pointer;
  touch-action: manipulation;
}
.search-result:hover { background: var(--bg); }
.search-result img { width: 36px; height: 54px; object-fit: cover; border-radius: 3px; background: var(--bg); }
.search-result .sr-title { font-size: 0.9rem; font-weight: 600; }
.search-result .sr-author { font-size: 0.78rem; color: var(--ink-soft); }

.manual-entry { margin-top: 1.25rem; font-size: 0.85rem; color: var(--ink-soft); }
.manual-entry form { display: flex; flex-direction: column; gap: 0.5rem; margin-top: 0.75rem; }

.detail-body { display: flex; gap: 1.25rem; }
.detail-cover {
  width: 120px;
  aspect-ratio: 2 / 3;
  object-fit: cover;
  border-radius: 4px;
  border: 1px solid var(--border);
  flex-shrink: 0;
}
.detail-fields { flex: 1; min-width: 0; }
.detail-fields h2 { font-size: 1.15rem; margin: 0; }
.date-row { display: flex; gap: 0.75rem; min-width: 0; }
.date-row label { flex: 1; min-width: 0; }
.date-row input { width: 100%; min-width: 0; }
.detail-actions { display: flex; justify-content: space-between; margin-top: 1.5rem; }

@media (max-width: 420px) {
  .modal { padding: 1.5rem 1.25rem; }
  .detail-body { flex-direction: column; }
  .detail-cover { width: 96px; align-self: center; }
}

.star-picker { font-size: 1.4rem; color: var(--border); cursor: pointer; user-select: none; }
.star-picker span { transition: color 0.1s ease; }
.star-picker span.filled { color: var(--gold); }

/* --- Custom dropdown + date picker ---
   Panels are appended to <body> and positioned with fixed coordinates (see
   attachFloatingToggle in app.js), not to the trigger's parent, because the
   detail modal scrolls (overflow-y: auto) and would silently clip a panel
   positioned relative to something inside it. */

.cselect-btn, .cdate-btn {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  text-align: left;
  font-family: inherit;
  font-size: 0.95rem;
}
.cdate-btn { padding-left: 0.5rem; padding-right: 0.5rem; }
.cdate-btn span {
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  font-variant-numeric: tabular-nums;
  font-size: 0.86rem;
}
.cselect-chevron { opacity: 0.6; font-size: 0.75rem; flex-shrink: 0; }

.floating-panel {
  position: fixed;
  z-index: 200;
  background: var(--paper);
  border: 1px solid var(--border);
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.cselect-list { padding: 0.3rem; max-height: 260px; overflow-y: auto; min-width: 160px; }
.cselect-option {
  padding: 0.5rem 0.7rem;
  border-radius: 5px;
  cursor: pointer;
  font-size: 0.92rem;
  color: var(--ink);
  touch-action: manipulation;
}
.cselect-option:hover { background: var(--bg); }
.cselect-option[aria-selected="true"] { color: var(--accent-dark); font-weight: 600; }

.cdate-panel { padding: 0.8rem; width: 250px; }
.cdate-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.6rem;
  font-weight: 600;
  font-size: 0.85rem;
  color: var(--ink);
}
.cdate-header button {
  background: none;
  border: none;
  padding: 0.2rem 0.6rem;
  font-size: 1rem;
  cursor: pointer;
  color: var(--ink-soft);
  touch-action: manipulation;
}
.cdate-header button:hover { color: var(--ink); }
.cdate-grid { display: grid; grid-template-columns: repeat(7, 1fr); gap: 2px; }
.cdate-dow { text-align: center; font-size: 0.66rem; color: var(--ink-soft); padding: 0.25rem 0; }
.cdate-day {
  aspect-ratio: 1;
  border: none;
  background: none;
  border-radius: 5px;
  cursor: pointer;
  font-size: 0.82rem;
  color: var(--ink);
  touch-action: manipulation;
  font-variant-numeric: tabular-nums;
}
.cdate-day:hover { background: var(--bg); }
.cdate-day.selected { background: var(--accent); color: #fff; }
.cdate-day.today:not(.selected) { box-shadow: inset 0 0 0 1px var(--gold); }
.cdate-footer {
  display: flex;
  justify-content: space-between;
  margin-top: 0.6rem;
  padding-top: 0.6rem;
  border-top: 1px solid var(--border);
}
.cdate-footer button { font-size: 0.78rem; padding: 0.35rem 0.6rem; }

.tabs-mobile .cselect-btn { font-weight: 600; }