:root {
  --bg: #f4f1ea;
  --surface: #ffffff;
  --text: #1d232b;
  --muted: #6b7280;
  --border: #ddd6c8;
  --accent: #2b5d8a;
  --accent-text: #ffffff;
  --top: #1f2a37;
  --top-text: #f4f1ea;
  --ok-bg: #dcf5e3; --ok-fg: #0f5f2c; --ok-bd: #2f9e57;
  --warn-bg: #fff1cc; --warn-fg: #7a4d00; --warn-bd: #e0a100;
  --bad-bg: #fde2e1; --bad-fg: #8a1c17; --bad-bd: #d9483f;
  --info-bg: #e3edf7; --info-fg: #1f4467; --info-bd: #2b5d8a;
  --radius: 10px;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14181d; --surface: #1e242b; --text: #e8e6e1; --muted: #9aa3ad;
    --border: #333c46; --accent: #5b9bd5; --accent-text: #0d1116;
    --top: #0d1116; --top-text: #e8e6e1;
    --ok-bg: #12351f; --ok-fg: #9ff0ba; --ok-bd: #2f9e57;
    --warn-bg: #3a2c05; --warn-fg: #ffd77a; --warn-bd: #e0a100;
    --bad-bg: #3d1513; --bad-fg: #ffb3ad; --bad-bd: #d9483f;
    --info-bg: #142a40; --info-fg: #b5d3f0; --info-bd: #5b9bd5;
  }
}

* { box-sizing: border-box; }
html, body { margin: 0; }
body {
  background: var(--bg); color: var(--text);
  font: 17px/1.4 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  min-height: 100vh; display: flex; flex-direction: column;
}
.hidden { display: none !important; }

/* ---------- top bar ---------- */
.topbar {
  position: sticky; top: 0; z-index: 10;
  display: flex; align-items: center; gap: 16px; flex-wrap: wrap;
  padding: 10px 16px; background: var(--top); color: var(--top-text);
}
.topbar h1 { font-size: 1.25rem; margin: 0; white-space: nowrap; }
.tabs { display: flex; gap: 6px; }
.tab {
  font: inherit; font-weight: 600; padding: 8px 20px; border-radius: 999px;
  border: 1px solid transparent; background: transparent; color: var(--top-text); cursor: pointer;
}
.tab.active { background: var(--top-text); color: var(--top); }
.stats { margin-left: auto; font-size: .9rem; opacity: .8; }

main { flex: 1; width: 100%; max-width: 960px; margin: 0 auto; padding: 16px; }
.view { display: none; }
.view.active { display: block; }

/* ---------- scan bar ---------- */
.scanbar { display: flex; gap: 8px; }
.scan-input {
  flex: 1; min-width: 0; font: inherit; font-size: 1.35rem;
  padding: 14px 16px; border-radius: var(--radius);
  border: 2px solid var(--border); background: var(--surface); color: var(--text);
}
.scan-input:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 25%, transparent); }

.btn {
  font: inherit; font-weight: 600; padding: 10px 16px; border-radius: var(--radius);
  border: 1px solid var(--border); background: var(--surface); color: var(--text); cursor: pointer;
  touch-action: manipulation;
}
.btn.primary { background: var(--accent); border-color: var(--accent); color: var(--accent-text); }
.btn.danger { color: var(--bad-fg); border-color: var(--bad-bd); background: transparent; }
.btn.ghost { background: transparent; }
.btn.wide { display: block; width: 100%; margin-top: 12px; }
.btn:disabled { opacity: .5; cursor: default; }

/* ---------- banners ---------- */
.banner {
  margin: 14px 0; padding: 14px 16px; border-radius: var(--radius);
  border: 2px solid; font-size: 1.05rem;
}
.banner .big { font-size: 1.6rem; font-weight: 800; display: block; }
.banner.ok   { background: var(--ok-bg);   color: var(--ok-fg);   border-color: var(--ok-bd); }
.banner.warn { background: var(--warn-bg); color: var(--warn-fg); border-color: var(--warn-bd); }
.banner.bad  { background: var(--bad-bg);  color: var(--bad-fg);  border-color: var(--bad-bd); }
.banner.info { background: var(--info-bg); color: var(--info-fg); border-color: var(--info-bd); }
.banner .actions { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 10px; }
.flash { animation: flash .5s ease-out; }
@keyframes flash { from { transform: scale(1.03); } to { transform: none; } }

/* ---------- options ---------- */
.options {
  display: flex; flex-wrap: wrap; align-items: center; gap: 10px 20px;
  margin: 12px 0; font-size: .95rem;
}
.options label.inline { display: flex; align-items: center; gap: 8px; }
.options input[type=text] {
  font: inherit; padding: 6px 10px; border-radius: 8px;
  border: 1px solid var(--border); background: var(--surface); color: var(--text);
}
input[type=checkbox] { width: 20px; height: 20px; vertical-align: middle; accent-color: var(--accent); }

/* ---------- book list ---------- */
.list-header { display: flex; justify-content: space-between; align-items: center; margin: 14px 2px 8px; color: var(--muted); }
.list-header select, .book-form select {
  font: inherit; padding: 6px 8px; border-radius: 8px;
  border: 1px solid var(--border); background: var(--surface); color: var(--text);
}
.book-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 8px; }
.book {
  display: flex; gap: 12px; align-items: flex-start; padding: 10px;
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  cursor: pointer;
}
.book.match { border: 2px solid var(--ok-bd); }
.book img, .book .nocover {
  width: 56px; height: 84px; flex: none; object-fit: cover; border-radius: 4px;
  background: var(--border);
}
.book .nocover { display: grid; place-items: center; font-size: 1.6rem; }
.book .info { min-width: 0; flex: 1; }
.book .title { font-weight: 700; }
.book .sub, .book .meta { color: var(--muted); font-size: .9rem; }
.book .meta { margin-top: 2px; word-break: break-all; }
.book .badge {
  display: inline-block; font-size: .75rem; font-weight: 700; padding: 1px 8px;
  border-radius: 999px; background: var(--info-bg); color: var(--info-fg); margin-left: 6px;
}
.book-list.compact .book img, .book-list.compact .book .nocover { width: 40px; height: 60px; }
.book .undo { margin-left: auto; align-self: center; }
.empty { color: var(--muted); text-align: center; padding: 30px 0; }
.section-title { font-size: 1rem; color: var(--muted); margin: 24px 2px 8px; font-weight: 600; }

/* ---------- forms ---------- */
.book-form {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 14px; margin-top: 12px;
}
.form-top { display: flex; gap: 14px; align-items: flex-start; }
.form-top .form-grid { flex: 1; }
.cover-preview { width: 110px; height: 165px; object-fit: cover; border-radius: 6px; background: var(--border); flex: none; }
.cover-preview[src=""] { visibility: hidden; width: 0; }
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin-bottom: 10px; }
.form-grid .span2 { grid-column: span 2; }
.book-form label { display: flex; flex-direction: column; gap: 4px; font-size: .85rem; color: var(--muted); }
.book-form input, .book-form textarea, .book-form select {
  font: inherit; font-size: 1rem; color: var(--text); padding: 8px 10px;
  border-radius: 8px; border: 1px solid var(--border); background: var(--bg); width: 100%;
}
.form-actions { display: flex; gap: 8px; flex-wrap: wrap; justify-content: flex-end; }
.form-actions .left { margin-right: auto; }

dialog {
  width: min(760px, calc(100vw - 24px)); max-height: calc(100vh - 24px); padding: 0;
  border: none; border-radius: 14px; background: var(--bg); color: var(--text);
}
dialog::backdrop { background: rgba(0, 0, 0, .55); }
dialog .book-form { margin: 0; border: none; }

/* ---------- login ---------- */
.login-card {
  max-width: 520px; margin: 30px auto; padding: 20px;
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
}
.login-card h2 { margin: 0 0 6px; font-size: 1.3rem; }
.login-card p { margin: 0 0 14px; color: var(--muted); font-size: .95rem; }
.login-error { color: var(--bad-fg); min-height: 1.4em; margin-top: 8px; font-weight: 600; }
.auth-links { margin-left: auto; display: flex; gap: 6px; }
.dialog-title { margin: 0 0 12px; font-size: 1.2rem; }
#pw-dialog { width: min(440px, calc(100vw - 24px)); }
.book-form fieldset { border: none; padding: 0; margin: 0; min-width: 0; }

.footer {
  display: flex; flex-wrap: wrap; gap: 10px 22px; align-items: center; justify-content: center;
  padding: 14px 16px 22px; color: var(--muted); font-size: .9rem;
}
.footer a { color: var(--accent); }

@media (max-width: 560px) {
  body { font-size: 16px; }
  .stats { display: none; }
  .form-top { flex-direction: column; }
  .cover-preview { width: 90px; height: 135px; }
  .form-grid { grid-template-columns: 1fr; }
  .form-grid .span2 { grid-column: auto; }
}