/* ═══════════════════════════════════════════════════════════
   scraperZLibraryMain.css  ·  Mainframe Design System v3
   ═══════════════════════════════════════════════════════════ */

:root {
  --font-heading: 'HelveticaNowDisplay-Medium','Helvetica Neue',Arial,sans-serif;
  --font-body:    'HelveticaNowDisplayW01-Rg','Helvetica Neue',Arial,sans-serif;
  --ink:          #0a0a0a;
  --ink-70:       rgba(10,10,10,0.70);
  --ink-45:       rgba(10,10,10,0.45);
  --ink-20:       rgba(10,10,10,0.20);
  --ink-10:       rgba(10,10,10,0.10);
  --ink-06:       rgba(10,10,10,0.06);
  --ink-03:       rgba(10,10,10,0.03);
  --surface:      #f4f3ef;
  --surface-2:    #eeecea;
  --card:         #ffffff;
  --radius-pill:  9999px;
  --radius-xl:    24px;
  --radius-lg:    18px;
  --radius-md:    12px;
  --shadow-xs:    0 1px 2px rgba(0,0,0,0.06);
  --shadow-sm:    0 2px 10px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md:    0 6px 28px rgba(0,0,0,0.10), 0 2px 6px rgba(0,0,0,0.05);
  --shadow-inset: inset 0 1px 0 rgba(255,255,255,0.8);
}

@keyframes fade-up {
  from { opacity:0; transform:translateY(14px); }
  to   { opacity:1; transform:none; }
}
@keyframes spin { to { transform:rotate(360deg); } }

*,*::before,*::after { margin:0; padding:0; box-sizing:border-box; }

html {
  font-family: var(--font-body);
  -webkit-font-smoothing: antialiased;
  background: var(--surface);
  color: var(--ink);
}

body {
  min-height: 100vh;
  background: var(--surface);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='300' height='300'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.65' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='300' height='300' filter='url(%23n)' opacity='0.028'/%3E%3C/svg%3E");
  padding: 0 28px 100px;
  font-family: var(--font-body);
}

/* ─── Layout ─────────────────────────────────────────────── */
.container {
  max-width: 1260px;
  margin: 0 auto;
  animation: fade-up .65s cubic-bezier(.22,1,.36,1) backwards;
  animation-delay: .04s;
}

/* ─── Page Header ────────────────────────────────────────── */
.header {
  padding: 42px 0 28px;
  border-bottom: 1px solid var(--ink-10);
  margin-bottom: 0;
}

/* Eyebrow */
.header::before {
  content: '✦  Z-Library Search';
  display: inline-block;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--ink-45);
  margin-bottom: 14px;
  padding: 6px 14px;
  background: var(--card);
  border: 1px solid var(--ink-10);
  border-radius: var(--radius-pill);
  box-shadow: var(--shadow-xs);
}

.header h1 {
  font-family: var(--font-heading);
  font-size: clamp(30px, 5.5vw, 50px);
  font-weight: 500;
  letter-spacing: -0.055em;
  line-height: 1.0;
  color: var(--ink);
  margin-bottom: 8px;
}

.header p {
  font-size: 14px;
  color: var(--ink-45);
  line-height: 1.5;
}

/* ─── Search Section ─────────────────────────────────────── */
.search-section {
  padding: 26px 0;
  border-bottom: 1px solid var(--ink-06);
}

.search-form {
  display: flex;
  gap: 10px;
  align-items: flex-end;
  flex-wrap: wrap;
}

.form-group { flex:1; min-width:200px; }

.form-group label {
  display: block;
  margin-bottom: 7px;
  font-size: 10px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .1em;
  color: var(--ink-45);
}

.form-group input {
  width: 100%;
  padding: 11px 18px;
  border: 1px solid var(--ink-10);
  border-radius: var(--radius-pill);
  font-size: 14px;
  font-family: var(--font-body);
  background: var(--card);
  color: var(--ink);
  box-shadow: var(--shadow-xs), var(--shadow-inset);
  transition: border-color .2s, box-shadow .2s;
  -webkit-appearance: none;
}
.form-group input:focus {
  outline: none;
  border-color: var(--ink-45);
  box-shadow: 0 0 0 3px rgba(10,10,10,.07), var(--shadow-inset);
}
.form-group input::placeholder { color: var(--ink-20); }
.form-group small {
  display: block;
  margin-top: 6px;
  font-size: 11px;
  color: var(--ink-45);
  padding-left: 10px;
}

/* ─── Checkbox pills ─────────────────────────────────────── */
.checkbox-group {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 16px;
}

.checkbox-group label {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-size: 13px;
  letter-spacing: -0.01em;
  color: var(--ink-70);
  background: var(--card);
  border: 1px solid var(--ink-10);
  border-radius: var(--radius-pill);
  padding: 6px 16px;
  cursor: pointer;
  box-shadow: var(--shadow-xs), var(--shadow-inset);
  user-select: none;
  transition: background .18s, color .18s, border-color .18s, box-shadow .18s;
}
.checkbox-group label:hover {
  background: var(--ink);
  color: #fff;
  border-color: var(--ink);
  box-shadow: var(--shadow-sm);
}
.checkbox-group input[type="checkbox"] {
  accent-color: var(--ink);
  width: 13px; height: 13px; cursor: pointer;
}

/* ─── Buttons ────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 9px 22px;
  border-radius: var(--radius-pill);
  font-size: 13px;
  font-family: var(--font-body);
  letter-spacing: -0.01em;
  cursor: pointer;
  border: 1px solid var(--ink-10);
  text-decoration: none;
  white-space: nowrap;
  background: var(--card);
  color: var(--ink);
  box-shadow: var(--shadow-xs), var(--shadow-inset);
  margin: 0 5px 5px 0;
  line-height: 1;
  position: relative;
  overflow: hidden;
  transition: background .2s, color .2s, border-color .2s, box-shadow .2s,
              transform .18s cubic-bezier(.22,1,.36,1);
}
.btn:hover:not(:disabled) {
  background: var(--ink);
  color: #fff;
  border-color: var(--ink);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}
.btn:active:not(:disabled) { transform:scale(.97) translateY(0); box-shadow:var(--shadow-xs); }
.btn:disabled { opacity:.35; cursor:not-allowed; }

.btn-primary { background:var(--ink); color:#fff; border-color:var(--ink); box-shadow:var(--shadow-sm); }
.btn-primary:hover:not(:disabled) { background:#1a1a1a; }

.btn-download { background:var(--ink); color:#fff; border-color:var(--ink); box-shadow:var(--shadow-sm); }
.btn-download:hover:not(:disabled) { background:#1a1a1a; }

/* ─── Results Section ────────────────────────────────────── */
.results-section { padding: 26px 0; }

/* ─── Stats Bar — horizontal card row ───────────────────── */
.stats-bar {
  display: flex;
  background: var(--card);
  border: 1px solid var(--ink-10);
  border-radius: var(--radius-xl);
  margin-bottom: 26px;
  overflow: hidden;
  box-shadow: var(--shadow-sm), var(--shadow-inset);
  flex-wrap: wrap;
}
.stat-item {
  flex: 1;
  min-width: 120px;
  padding: 22px 26px;
  border-right: 1px solid var(--ink-06);
  position: relative;
}
.stat-item:last-child { border-right: none; }
.stat-item::before {
  content: '';
  position: absolute;
  top: 0; left: 26px; right: 26px;
  height: 1.5px;
  background: linear-gradient(90deg, transparent 0%, var(--ink-10) 50%, transparent 100%);
}
.stat-label {
  font-size: 10px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .1em;
  color: var(--ink-45);
  margin-bottom: 6px;
}
.stat-value {
  font-family: var(--font-heading);
  font-size: clamp(24px, 3.5vw, 34px);
  font-weight: 500;
  letter-spacing: -0.05em;
  color: var(--ink);
  line-height: 1.05;
}

/* ─── Books Grid ─────────────────────────────────────────── */
.books-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(310px, 1fr));
  gap: 1px;
  background: var(--ink-10);
  border: 1px solid var(--ink-10);
  border-radius: var(--radius-xl);
  overflow: hidden;
  margin-top: 18px;
  box-shadow: var(--shadow-sm);
}

.book-card {
  background: var(--card);
  padding: 22px 20px 18px;
  position: relative;
  transition: background .18s;
}
.book-card:hover { background: #fdfcf9; }
.book-card.selected {
  background: rgba(10,10,10,0.025);
  box-shadow: inset 3px 0 0 var(--ink);
}

.book-checkbox {
  position: absolute;
  top: 18px; right: 18px;
  width: 15px; height: 15px;
  accent-color: var(--ink);
  cursor: pointer;
}

.book-title {
  font-size: 14px;
  font-weight: 500;
  letter-spacing: -0.02em;
  color: var(--ink);
  margin-bottom: 4px;
  line-height: 1.4;
  padding-right: 26px;
}
.book-authors {
  font-size: 12px;
  color: var(--ink-45);
  margin-bottom: 14px;
}

.book-details {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 8px 10px;
  margin-bottom: 14px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--ink-06);
}
.detail-item { font-size: 11px; }
.detail-label {
  color: var(--ink-45);
  text-transform: uppercase;
  font-size: 9.5px;
  letter-spacing: .07em;
  font-weight: 700;
  margin-bottom: 1px;
}
.detail-value { color: var(--ink-70); }

.book-link {
  display: inline-block;
  font-size: 12px;
  color: var(--ink);
  text-decoration: underline;
  text-underline-offset: 2px;
  text-decoration-color: var(--ink-20);
  transition: text-decoration-color .18s;
}
.book-link:hover { text-decoration-color: var(--ink); }

/* ─── Loading ─────────────────────────────────────────────── */
.loading { text-align:center; padding:80px 20px; display:none; }
.spinner {
  width:26px; height:26px;
  border:1.5px solid var(--ink-10);
  border-top-color: var(--ink);
  border-radius:50%;
  animation:spin .7s linear infinite;
  margin:0 auto 16px;
}
.loading p { font-size:13px; color:var(--ink-45); }

/* ─── Misc ───────────────────────────────────────────────── */
.progress-container { margin-top:12px; }
.progress-text { font-size:11px; color:var(--ink-45); margin-top:5px; }

.error-message {
  background:var(--card);
  border:1px solid var(--ink-10);
  color:var(--ink-70);
  padding:12px 18px;
  border-radius:var(--radius-md);
  margin:14px 0;
  font-size:13px;
  display:none;
  box-shadow:var(--shadow-xs);
}

.empty-state { text-align:center; padding:80px 24px; color:var(--ink-45); }
.empty-state h3 {
  font-family:var(--font-heading);
  font-size:20px;
  font-weight:500;
  letter-spacing:-0.04em;
  color:var(--ink);
  margin-bottom:8px;
}
.empty-state p { font-size:14px; }

.download-section { display:flex; gap:6px; flex-wrap:wrap; margin:18px 0; }

.selection-bar {
  display:flex;
  align-items:center;
  justify-content:space-between;
  padding:12px 0;
  border-bottom:1px solid var(--ink-06);
  margin-bottom:14px;
  flex-wrap:wrap;
  gap:10px;
}
.selection-controls { display:flex; align-items:center; gap:10px; }
.selection-controls label {
  display:inline-flex;
  align-items:center;
  gap:7px;
  font-size:13px;
  color:var(--ink);
  cursor:pointer;
}
.selection-controls label input { accent-color:var(--ink); }
.selection-info { font-size:12px; color:var(--ink-45); }

.stats-detail { margin-top:30px; padding-top:22px; border-top:1px solid var(--ink-10); }
.stats-detail h3 {
  font-size:10px;
  font-weight:700;
  letter-spacing:.1em;
  text-transform:uppercase;
  color:var(--ink-45);
  margin-bottom:16px;
}

hr { border:none; border-top:1px solid var(--ink-06); margin:14px 0; }

.load-more-container { margin-top:28px; text-align:center; }
.load-more-btn { width:100%; padding:13px; font-size:13px; }

#resultCountHeader {
  font-size:10px;
  font-weight:700;
  letter-spacing:.1em;
  text-transform:uppercase;
  color:var(--ink-45);
  margin:20px 0 14px;
}