:root {
  --bg: #0b0d10;
  --card: #12161b;
  --muted: #9aa7b2;
  --text: #e8eef2;
  --border: #23303b;
  --accent: #4da3ff;
  --accent2: #2bd4a7;
  --danger: #ff5a5f;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }

.topbar {
  position: sticky;
  top: 0;
  background: rgba(11, 13, 16, 0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
  z-index: 10;
}
.topbar__inner {
  max-width: 1040px;
  margin: 0 auto;
  padding: 12px 16px;
  display: flex;
  gap: 16px;
  align-items: center;
  justify-content: space-between;
}
.brand { font-weight: 700; letter-spacing: 0.2px; }
.nav a { color: var(--muted); margin-left: 12px; }
.nav a:hover { color: var(--text); }

.container {
  max-width: 1040px;
  margin: 0 auto;
  padding: 16px;
}
.footer { border-top: 1px solid var(--border); margin-top: 24px; }
.footer__inner { padding: 16px; color: var(--muted); }

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 16px;
  box-shadow: 0 10px 30px rgba(0,0,0,0.25);
}
.row { display: flex; gap: 16px; align-items: flex-start; }
.row--space { justify-content: space-between; }
.grow { flex: 1; }

.muted { color: var(--muted); }
.actions { margin-top: 12px; display: flex; gap: 10px; }
.actions.wrap { flex-wrap: wrap; }
.btn {
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text);
  padding: 10px 12px;
  border-radius: 10px;
  cursor: pointer;
  font-weight: 600;
}
.btn:hover { border-color: #355068; }
.btn.primary {
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  color: #061018;
  border: none;
}
.btn:disabled { opacity: 0.5; cursor: not-allowed; }

.notice {
  margin-top: 12px;
  border: 1px dashed var(--border);
  border-radius: 12px;
  padding: 10px 12px;
  color: var(--muted);
}
.notice.success {
  border-color: rgba(43, 212, 167, 0.55);
  color: #b9ffe8;
}

.searchbar {
  display: flex;
  gap: 10px;
  margin-top: 10px;
}
.searchbar input, .searchbar select {
  flex: 1;
  background: #0d1116;
  border: 1px solid var(--border);
  color: var(--text);
  padding: 10px 12px;
  border-radius: 10px;
  outline: none;
}
.searchbar select { max-width: 180px; }
.searchbar input:focus { border-color: #355068; }

.grid {
  display: grid;
  grid-template-columns: repeat( auto-fill, minmax(240px, 1fr) );
  gap: 12px;
  margin-top: 14px;
}
.book {
  display: flex;
  gap: 12px;
  padding: 10px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: #0d1116;
}
.book:hover { border-color: #355068; }
.book__cover {
  width: 78px;
  height: 110px;
  border-radius: 10px;
  overflow: hidden;
  border: 1px solid var(--border);
  background: #0b0d10;
}
.book__cover--detail { width: 140px; height: 200px; }
.cover__placeholder {
  width: 100%;
  height: 100%;
  display: grid;
  place-items: center;
  color: var(--muted);
  font-size: 12px;
}
.book__meta { min-width: 0; }
.book__title { font-weight: 800; line-height: 1.2; margin-bottom: 6px; }
.book__authors { font-size: 13px; }

.pill {
  display: inline-block;
  margin-top: 10px;
  padding: 6px 10px;
  border-radius: 999px;
  border: 1px solid var(--border);
  color: var(--muted);
  font-size: 12px;
}

.scan-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-top: 14px;
}
.video-wrap {
  position: relative;
  width: 100%;
  aspect-ratio: 4 / 3;
  background: #0d1116;
  border: 1px solid var(--border);
  border-radius: 14px;
  overflow: hidden;
}
video {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.overlay {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  background: rgba(0,0,0,0.25);
  color: var(--text);
  text-align: center;
  padding: 16px;
}
.divider {
  height: 1px;
  background: var(--border);
  margin: 14px 0;
}
.result {
  margin-top: 12px;
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 12px;
  background: #0d1116;
}

@media (max-width: 900px) {
  .row { flex-direction: column; }
  .scan-grid { grid-template-columns: 1fr; }
  .searchbar { flex-direction: column; }
  .searchbar select { max-width: unset; }
}