/* Ebook Manager — reading-room design system (see DESIGN.md) */
:root {
  --paper: #F6F3EC;
  --card: #FFFDF8;
  --ink: #26221C;
  --ink-soft: #6E675C;
  --line: #E3DDD0;
  --accent: #7C2D2D;
  --accent-dk: #63201F;
  --accent-ink: #FFFDF8;
  --danger: #8A3B3B;
  --font-display: 'Iowan Old Style', 'Palatino Linotype', Palatino, Georgia, serif;
  --font-body: system-ui, -apple-system, 'Segoe UI', sans-serif;
  --fs-sm: 0.8125rem; --fs-base: 1rem; --fs-lg: 1.25rem; --fs-xl: 1.625rem; --fs-display: 2.5rem;
  --r-sm: 4px; --r-md: 8px;
  --e-sm: 0 1px 3px rgba(38, 34, 28, 0.08);
  --e-md: 0 4px 16px rgba(38, 34, 28, 0.12);
}
* { box-sizing: border-box; }
[hidden] { display: none !important; }
html, body { margin: 0; padding: 0; }
body {
  background: var(--paper); color: var(--ink);
  font: 400 var(--fs-base)/1.5 var(--font-body);
  min-height: 100vh;
}
h1, h2, .wordmark, .book-title { font-family: var(--font-display); font-weight: 600; }

/* ---------- header ---------- */
header {
  display: flex; align-items: center; gap: 16px; flex-wrap: wrap;
  padding: 16px 24px; background: var(--card);
  border-bottom: 1px solid var(--line);
}
.wordmark { font-size: var(--fs-xl); letter-spacing: -0.01em; margin: 0; }
.wordmark span { color: var(--accent); }
header .spacer { flex: 1; }

/* ---------- controls ---------- */
input[type="text"], input[type="email"], input[type="password"] {
  font: inherit; color: var(--ink); background: var(--card);
  border: 1px solid var(--line); border-radius: var(--r-sm);
  padding: 8px 12px; min-width: 0;
}
input:focus { outline: none; border-color: var(--accent); }
button {
  font: inherit; cursor: pointer; border-radius: var(--r-sm);
  padding: 8px 16px; border: 1px solid transparent;
  transition: background 0.15s ease, transform 0.1s ease;
}
button:focus-visible, input:focus-visible, a:focus-visible, select:focus-visible {
  outline: 2px solid var(--accent); outline-offset: 2px;
}
button:disabled { opacity: 0.4; cursor: not-allowed; }
.btn-primary { background: var(--accent); color: var(--accent-ink); }
.btn-primary:hover:not(:disabled) { background: var(--accent-dk); }
.btn-ghost { background: transparent; color: var(--ink); border-color: var(--line); }
.btn-ghost:hover:not(:disabled) { background: var(--line); }
.btn-ghost.active { border-color: var(--accent); color: var(--accent); }
.btn-danger { background: transparent; color: var(--danger); border-color: var(--line); }
.btn-danger:hover:not(:disabled) { background: var(--danger); color: var(--accent-ink); }
button:active:not(:disabled) { transform: translateY(1px); }

/* ---------- auth ---------- */
#auth-view {
  max-width: 360px; margin: 96px auto; padding: 32px;
  background: var(--card); border-radius: var(--r-md); box-shadow: var(--e-sm);
  display: flex; flex-direction: column; gap: 12px;
}
#auth-view .wordmark { font-size: var(--fs-display); text-align: center; }
#auth-view .wordmark span { color: var(--accent); }
.error-line { color: var(--danger); font-size: var(--fs-sm); min-height: 1.2em; }

/* ---------- shelf ---------- */
main { max-width: 1200px; margin: 0 auto; padding: 24px; }
.toolbar { display: flex; gap: 8px; align-items: center; margin-bottom: 24px; flex-wrap: wrap; }
.toolbar input[type="text"] { flex: 1; min-width: 200px; }
.grid {
  display: grid; gap: 24px;
  grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
}
.book-card {
  background: var(--card); border-radius: var(--r-md); box-shadow: var(--e-sm);
  overflow: hidden; display: flex; flex-direction: column;
  transition: box-shadow 0.15s ease, transform 0.15s ease;
}
.book-card:hover { box-shadow: var(--e-md); transform: translateY(-2px); }
.cover {
  aspect-ratio: 2 / 3; background: var(--line);
  display: flex; align-items: center; justify-content: center;
  padding: 12px; text-align: center; position: relative; cursor: pointer;
}
.cover .spine-title {
  font-family: var(--font-display); font-size: var(--fs-base);
  color: var(--ink-soft); line-height: 1.3;
}
.cover img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }
.book-meta { padding: 12px; display: flex; flex-direction: column; gap: 4px; flex: 1; }
.book-title { font-size: 1rem; line-height: 1.3; }
.book-author { font-size: var(--fs-sm); color: var(--ink-soft); }
.badge {
  align-self: flex-start; font-size: 0.6875rem; letter-spacing: 0.05em;
  text-transform: uppercase; color: var(--ink-soft);
  border: 1px solid var(--line); border-radius: var(--r-sm); padding: 1px 6px;
}
.book-actions { display: flex; gap: 4px; padding: 0 12px 12px; flex-wrap: wrap; }
.book-actions button { padding: 4px 10px; font-size: var(--fs-sm); }
.shared-by { font-size: var(--fs-sm); color: var(--accent); font-style: italic; }

/* ---------- find (z-library) ---------- */
.results { display: flex; flex-direction: column; }
.result-row {
  display: grid; grid-template-columns: 56px 1fr auto; gap: 16px; align-items: center;
  padding: 16px 0; border-bottom: 1px solid var(--line);
}
.result-row img { width: 56px; height: 84px; object-fit: cover; background: var(--line); border-radius: var(--r-sm); }
.result-title { font-family: var(--font-display); font-size: var(--fs-lg); }
.result-sub { font-size: var(--fs-sm); color: var(--ink-soft); }

.empty {
  text-align: center; color: var(--ink-soft); padding: 64px 16px;
  font-family: var(--font-display); font-size: var(--fs-lg);
}
.empty small { display: block; font-family: var(--font-body); font-size: var(--fs-sm); margin-top: 8px; }

/* ---------- dialog ---------- */
dialog {
  border: none; border-radius: var(--r-md); box-shadow: var(--e-md);
  background: var(--card); color: var(--ink); padding: 24px; min-width: 320px;
}
dialog::backdrop { background: rgba(38, 34, 28, 0.3); }
dialog form { display: flex; flex-direction: column; gap: 12px; }
dialog h2 { margin: 0; font-size: var(--fs-lg); }

.skeleton { background: linear-gradient(90deg, var(--line) 25%, var(--card) 50%, var(--line) 75%); background-size: 200% 100%; animation: shimmer 1.2s infinite; border-radius: var(--r-sm); }
@keyframes shimmer { to { background-position: -200% 0; } }
@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; animation: none !important; }
}

.visually-hidden { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); }