:root {
  --bg: #16181d;
  --panel: #1e2128;
  --panel-2: #282c35;
  --text: #eef0f3;
  --muted: #9aa3b2;
  --accent: #c9a34e;
  --accent-2: #7c9473;
  --danger: #d9603b;
  --border: #333844;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  background: var(--panel);
  border-bottom: 1px solid var(--border);
  padding: 0.75rem 1rem;
}

.topbar h1 {
  margin: 0 0 0.5rem 0;
  font-size: 1.3rem;
}

.tabs {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.tab-btn {
  flex: 1;
  min-width: 6rem;
  padding: 0.6rem;
  background: var(--panel-2);
  color: var(--muted);
  border: 1px solid var(--border);
  border-radius: 8px;
  cursor: pointer;
  font-size: 0.9rem;
}

.tab-btn.active {
  background: var(--accent);
  color: #201700;
  border-color: var(--accent);
  font-weight: 600;
}

main {
  max-width: 820px;
  margin: 0 auto;
  padding: 1rem;
}

.tab-panel { display: none; }
.tab-panel.active { display: block; }

.panel-controls {
  display: flex;
  gap: 0.5rem;
  align-items: center;
  margin-bottom: 1rem;
  flex-wrap: wrap;
}

.panel-controls input[type="search"] { flex: 1; min-width: 12rem; }

input[type="search"], input[type="text"], input[type="number"], input[type="file"], select, textarea {
  width: 100%;
  padding: 0.55rem 0.65rem;
  background: var(--panel-2);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 1rem;
}

label {
  display: block;
  margin: 0.75rem 0 0.25rem;
  font-size: 0.85rem;
  color: var(--muted);
}

.grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
}

button {
  cursor: pointer;
  font-size: 0.95rem;
  padding: 0.55rem 0.9rem;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--panel-2);
  color: var(--text);
}

button.primary-wide, #save-btn {
  width: 100%;
  background: var(--accent);
  color: #201700;
  border-color: var(--accent);
  font-weight: 600;
  margin-top: 0.5rem;
}

button.secondary {
  background: transparent;
}

.form-actions {
  display: flex;
  gap: 0.5rem;
  margin-top: 0.75rem;
}

.inline-form {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 1rem;
  flex-wrap: wrap;
}
.inline-form input { flex: 1; min-width: 10rem; }

.muted { color: var(--muted); font-size: 0.85rem; }
.hidden { display: none !important; }

.card-list {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.book-card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 0.75rem;
  display: flex;
  gap: 0.75rem;
  align-items: center;
}

.book-card img.cover-thumb {
  width: 48px;
  height: 68px;
  object-fit: cover;
  border-radius: 4px;
  flex-shrink: 0;
  background: var(--panel-2);
}

.book-card .info { flex: 1; min-width: 0; }
.book-card .name { font-weight: 600; }
.book-card .meta { color: var(--muted); font-size: 0.85rem; }
.book-card .location { color: var(--accent); font-size: 0.8rem; margin-top: 0.15rem; }
.book-card .actions { display: flex; flex-direction: column; gap: 0.3rem; }
.book-card .actions button { padding: 0.3rem 0.55rem; font-size: 0.8rem; }

.cover-preview {
  margin-top: 0.5rem;
  max-width: 100px;
  border-radius: 6px;
  display: block;
}

.scan-box {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 0.75rem;
  margin-bottom: 1rem;
}

.scan-row {
  display: flex;
  gap: 0.5rem;
}

.scan-row input { flex: 1; }

#scan-camera {
  margin-top: 0.6rem;
  border-radius: 8px;
  overflow: hidden;
}

.bookcase-block {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 0.75rem;
  margin-bottom: 0.75rem;
}

.bookcase-block h3 { margin: 0 0 0.25rem; }
.bookcase-block .muted { margin-bottom: 0.5rem; }

.side-badge {
  display: inline-block;
  background: var(--panel-2);
  border: 1px solid var(--border);
  color: var(--accent);
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 0.1rem 0.45rem;
  border-radius: 999px;
  vertical-align: middle;
}

.shelf-row {
  border-top: 1px solid var(--border);
  padding: 0.5rem 0;
}

.shelf-row .shelf-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.4rem;
}

.shelf-header .shelf-label { font-weight: 600; font-size: 0.9rem; }

.shelf-spines {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.spine-chip {
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.35rem 0.5rem;
  font-size: 0.8rem;
  display: flex;
  align-items: center;
  gap: 0.35rem;
  max-width: 14rem;
}

.spine-chip .spine-title {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.spine-chip .spine-controls {
  display: flex;
  gap: 0.15rem;
}

.spine-chip button {
  padding: 0.1rem 0.35rem;
  font-size: 0.7rem;
}

.add-shelf-form {
  display: flex;
  gap: 0.4rem;
  margin-top: 0.5rem;
}
.add-shelf-form input { flex: 1; }

.organize-columns {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-top: 1rem;
}

.organize-columns h4 { margin: 0 0 0.5rem; color: var(--muted); font-size: 0.85rem; text-transform: uppercase; letter-spacing: 0.05em; }

.organize-list {
  list-style: decimal;
  padding-left: 1.2rem;
  margin: 0;
  font-size: 0.9rem;
}
.organize-list li { padding: 0.2rem 0; }

@media (max-width: 560px) {
  .organize-columns { grid-template-columns: 1fr; }
}