*, *::before, *::after { box-sizing: border-box; }
:root {
  --bg: #f4f6f5; --card: #fff; --text: #1a1a1a; --muted: #6b7280;
  --accent: #1f6f5c; --accent-text: #fff; --border: #e5e7eb; --error: #b42318;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #111513; --card: #1b201e; --text: #e8ece9; --muted: #9aa3a0;
          --accent: #3fb594; --accent-text: #0b0f0d; --border: #2c3330; --error: #ff8a80; }
}
body { margin: 0; font: 16px/1.45 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
       background: var(--bg); color: var(--text); }
.container { max-width: 560px; margin: 0 auto; padding: 16px; display: flex; flex-direction: column; gap: 16px; }
.card { background: var(--card); border: 1px solid var(--border); border-radius: 14px; padding: 20px;
        display: flex; flex-direction: column; gap: 12px; }
h1, h2 { margin: 0; letter-spacing: -0.01em; }
h2 { font-size: 1.2rem; }
.brand-big { font-size: 2rem; text-align: center; }
.brand b, .brand-big b { color: var(--accent); }
.nav { display: flex; gap: 16px; align-items: center; padding: 12px 16px; max-width: 560px; margin: 0 auto; }
.nav a { color: var(--text); text-decoration: none; }
.nav .brand { font-weight: 700; margin-right: auto; }
a { color: var(--accent); }
.stack { display: flex; flex-direction: column; gap: 12px; }
label { display: flex; flex-direction: column; gap: 4px; font-size: .9rem; color: var(--muted); }
input[type=text], input:not([type]), input[type=password] {
  font: inherit; padding: 12px; border: 1px solid var(--border); border-radius: 10px;
  background: var(--bg); color: var(--text); width: 100%; }
button { font: inherit; padding: 12px 16px; border: 0; border-radius: 10px; background: var(--accent);
         color: var(--accent-text); font-weight: 600; cursor: pointer; }
button.link { background: none; color: var(--muted); padding: 0; font-weight: 400; }
.small-btn { padding: 6px 12px; font-size: .85rem; margin-top: 6px; }
.danger { background: var(--error); color: #fff; }
form.inline { display: inline; margin: 0; }
.segmented { display: flex; border: 1px solid var(--border); border-radius: 10px; overflow: hidden; }
.segmented label { flex: 1; color: var(--text); }
.segmented input { position: absolute; opacity: 0; }
.segmented span { display: block; text-align: center; padding: 10px 4px; cursor: pointer; font-size: .95rem; }
.segmented input:checked + span { background: var(--accent); color: var(--accent-text); font-weight: 600; }
.list { list-style: none; margin: 0; padding: 0; }
.list li a { display: flex; flex-direction: column; padding: 10px 0; border-bottom: 1px solid var(--border);
             color: var(--text); text-decoration: none; }
.books { margin: 0; padding-left: 1.4em; display: flex; flex-direction: column; gap: 12px; }
.title { font-weight: 600; }
.muted { color: var(--muted); }
.small { font-size: .85rem; }
.error { color: var(--error); }
.badge { display: inline-block; padding: 1px 8px; border-radius: 999px; background: var(--bg);
         border: 1px solid var(--border); margin-right: 4px; }
.status-done .badge { background: var(--accent); color: var(--accent-text); border-color: var(--accent); }
.status-failed .badge { border-color: var(--error); color: var(--error); }
progress { width: 100%; height: 6px; accent-color: var(--accent); }
audio { width: 100%; margin-top: 6px; }
.lib-book { border-top: 1px solid var(--border); padding-top: 12px; }
details { margin-top: 6px; }
.spinner { display: inline-block; width: 12px; height: 12px; border: 2px solid var(--border);
           border-top-color: var(--accent); border-radius: 50%; animation: spin 1s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }