:root {
  color-scheme: light dark;
  --bg: #f7f7f8;
  --fg: #1b1b1f;
  --card: #ffffff;
  --border: #e2e2e6;
  --accent: #4f46e5;
  --muted: #6b7280;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111114;
    --fg: #eceef1;
    --card: #1b1b20;
    --border: #2c2c33;
    --muted: #9ca3af;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--fg);
}

.container {
  max-width: 720px;
  margin: 0 auto;
  padding: 2rem 1rem 4rem;
}

h1 { font-size: 1.5rem; margin-bottom: 0.25rem; }
.subtitle { color: var(--muted); margin-top: 0; margin-bottom: 2rem; }

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.25rem;
  margin-bottom: 1.5rem;
}

.upload-form {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  align-items: center;
}

.upload-form input[type="text"] {
  flex: 1;
  min-width: 140px;
  padding: 0.5rem 0.6rem;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--fg);
}

.upload-form input[type="file"] { flex-basis: 100%; }

button, .btn {
  background: var(--accent);
  color: white;
  border: none;
  border-radius: 8px;
  padding: 0.5rem 1rem;
  cursor: pointer;
  font-size: 0.9rem;
}

button.secondary {
  background: transparent;
  color: var(--muted);
  border: 1px solid var(--border);
}

.book-list { list-style: none; padding: 0; margin: 0; }

.book-row {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.85rem 0;
  border-bottom: 1px solid var(--border);
}
.book-row:last-child { border-bottom: none; }

.book-info { flex: 1; min-width: 0; }
.book-title { font-weight: 600; text-decoration: none; color: var(--fg); }
.book-meta { color: var(--muted); font-size: 0.8rem; margin-top: 0.15rem; }

.progress-bar {
  width: 100%;
  height: 6px;
  border-radius: 3px;
  background: var(--border);
  overflow: hidden;
  margin-top: 0.4rem;
}
.progress-bar > span {
  display: block;
  height: 100%;
  background: var(--accent);
}

.empty-state { color: var(--muted); text-align: center; padding: 2rem 0; }

table { width: 100%; border-collapse: collapse; font-size: 0.85rem; }
th, td { text-align: left; padding: 0.4rem 0.3rem; border-bottom: 1px solid var(--border); }
th { color: var(--muted); font-weight: 500; }

a.back-link { color: var(--muted); text-decoration: none; font-size: 0.85rem; }