/* ── THEME VARIABLES ────────────────────────────────────── */
:root {
  --bg: #f5f0e8;
  --bg-card: #fffdf7;
  --text-primary: #1a1208;
  --text-secondary: #5a4a2e;
  --accent: #c9581a;
  --accent-light: #f5dfd1;
  --accent-dark: #8b3a10;
  --border: #e0d5c0;
  --shadow: 0 4px 20px rgba(0,0,0,0.08);
  --shadow-hover: 0 12px 40px rgba(0,0,0,0.15);
  --radius: 12px;
  --font-display: 'Playfair Display', Georgia, serif;
  --font-body: 'DM Sans', sans-serif;
  --chip-bg: #ede5d5;
  --chip-text: #5a4a2e;
  --select-bg: #fffdf7;
  --controls-bg: #ede8dc;
}

/* ── DARK MODE ──────────────────────────────────────────── */
[data-theme="dark"] {
  --bg: #141008;
  --bg-card: #1e1810;
  --text-primary: #f0ead8;
  --text-secondary: #9a8a6a;
  --accent: #e06828;
  --accent-light: #2e1808;
  --accent-dark: #f08848;
  --border: #332a1a;
  --shadow: 0 4px 20px rgba(0,0,0,0.4);
  --shadow-hover: 0 12px 40px rgba(0,0,0,0.6);
  --chip-bg: #2a2010;
  --chip-text: #9a8a6a;
  --select-bg: #1e1810;
  --controls-bg: #1a1408;
}

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

body {
  font-family: var(--font-body);
  background-color: var(--bg);
  color: var(--text-primary);
  min-height: 100vh;
  background-image: radial-gradient(circle at 20% 20%, rgba(201,88,26,0.06) 0%, transparent 50%),
                    radial-gradient(circle at 80% 80%, rgba(201,88,26,0.04) 0%, transparent 50%);
  transition: background-color 0.3s ease, color 0.3s ease;
}

/* ── HEADER ─────────────────────────────────────────────── */
.header {
  background: var(--text-primary);
  color: #f5f0e8;
  padding: 1.5rem 1.5rem 1.8rem;
  text-align: center;
  position: relative;
  overflow: hidden;
  transition: background 0.3s ease;
}

.header::before {
  content: '';
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(
    45deg,
    transparent,
    transparent 20px,
    rgba(255,255,255,0.015) 20px,
    rgba(255,255,255,0.015) 40px
  );
}

.header-inner {
  position: relative;
  z-index: 1;
}

/* Row: logo on left, actions on right */
.header-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.4rem;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.logo-icon {
  font-size: 2rem;
}

.logo-text {
  font-family: var(--font-display);
  font-size: 2.4rem;
  font-weight: 900;
  letter-spacing: -1px;
  color: #f5f0e8;
}

.header-sub {
  font-size: 0.9rem;
  color: rgba(245,240,232,0.55);
  font-weight: 300;
  letter-spacing: 0.05em;
}

/* Header action buttons */
.header-actions {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.fav-btn {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  background: rgba(255,255,255,0.1);
  border: 1px solid rgba(255,255,255,0.18);
  color: #f5f0e8;
  padding: 0.4rem 0.9rem;
  border-radius: 20px;
  font-family: var(--font-body);
  font-size: 0.8rem;
  cursor: pointer;
  transition: background 0.2s;
}

.fav-btn:hover { background: rgba(255,255,255,0.2); }

.fav-btn.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

.fav-icon { font-size: 0.9rem; }

.fav-count {
  background: rgba(255,255,255,0.25);
  border-radius: 10px;
  padding: 0.05rem 0.45rem;
  font-size: 0.75rem;
  font-weight: 600;
  min-width: 20px;
  text-align: center;
}

.fav-btn.active .fav-count {
  background: rgba(255,255,255,0.3);
}

.theme-toggle {
  background: rgba(255,255,255,0.1);
  border: 1px solid rgba(255,255,255,0.18);
  color: #f5f0e8;
  width: 38px;
  height: 38px;
  border-radius: 50%;
  cursor: pointer;
  font-size: 1.1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s, transform 0.3s;
  flex-shrink: 0;
}

.theme-toggle:hover {
  background: rgba(255,255,255,0.2);
  transform: rotate(20deg);
}

/* ── SEARCH ─────────────────────────────────────────────── */
.search-section {
  max-width: 700px;
  margin: 2.5rem auto 0;
  padding: 0 1.5rem;
}

.search-wrapper {
  display: flex;
  gap: 0;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  border: 2px solid var(--border);
  background: var(--bg-card);
  transition: border-color 0.2s, box-shadow 0.2s, background 0.3s;
}

.search-wrapper:focus-within {
  border-color: var(--accent);
  box-shadow: 0 0 0 4px rgba(201,88,26,0.12);
}

.search-input {
  flex: 1;
  padding: 1rem 1.2rem;
  border: none;
  outline: none;
  font-size: 1rem;
  font-family: var(--font-body);
  background: transparent;
  color: var(--text-primary);
  transition: color 0.3s;
}

.search-input::placeholder {
  color: #b0a090;
}

.search-btn {
  padding: 1rem 1.6rem;
  background: var(--accent);
  color: white;
  border: none;
  cursor: pointer;
  font-size: 0.95rem;
  font-family: var(--font-body);
  font-weight: 500;
  letter-spacing: 0.03em;
  transition: background 0.2s;
}

.search-btn:hover {
  background: var(--accent-dark);
}

/* ── CONTROLS BAR ───────────────────────────────────────── */
.controls-bar {
  max-width: 1200px;
  margin: 1.5rem auto 0;
  padding: 0.8rem 1.5rem;
  background: var(--controls-bg);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.8rem;
  transition: background 0.3s, border-color 0.3s;
}

.controls-left {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  flex-wrap: wrap;
}

.controls-right {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.controls-label {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-secondary);
  font-weight: 500;
  white-space: nowrap;
}

/* Filter chips */
.filter-chips {
  display: flex;
  gap: 0.4rem;
  flex-wrap: wrap;
}

.chip {
  padding: 0.28rem 0.75rem;
  border-radius: 20px;
  background: var(--chip-bg);
  color: var(--chip-text);
  border: 1.5px solid transparent;
  font-size: 0.78rem;
  font-family: var(--font-body);
  cursor: pointer;
  transition: all 0.2s ease;
  white-space: nowrap;
}

.chip:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.chip.active {
  background: var(--accent-light);
  border-color: var(--accent);
  color: var(--accent);
  font-weight: 500;
}

/* Sort dropdown */
.sort-select {
  padding: 0.38rem 1.8rem 0.38rem 0.7rem;
  background: var(--select-bg);
  border: 1.5px solid var(--border);
  border-radius: 6px;
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: 0.82rem;
  outline: none;
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6'%3E%3Cpath d='M0 0l5 6 5-6z' fill='%235a4a2e'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.55rem center;
  transition: border-color 0.2s, background 0.3s, color 0.3s;
}

.sort-select:focus {
  border-color: var(--accent);
}

/* ── RESULTS INFO ───────────────────────────────────────── */
.results-info {
  max-width: 1200px;
  margin: 0.9rem auto 0;
  padding: 0 1.5rem;
  font-size: 0.88rem;
  color: var(--text-secondary);
}

/* ── LOADER ─────────────────────────────────────────────── */
.loader-wrapper {
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 4rem 1rem;
  gap: 1rem;
}

.loader-wrapper.active {
  display: flex;
}

.spinner {
  width: 48px;
  height: 48px;
  border: 4px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.loader-text {
  color: var(--text-secondary);
  font-size: 0.95rem;
  animation: pulse 1.5s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50%       { opacity: 0.4; }
}

/* ── ERROR ──────────────────────────────────────────────── */
.error-msg {
  max-width: 600px;
  margin: 2rem auto;
  padding: 1rem 1.5rem;
  background: #fff0ee;
  border-left: 4px solid #e03e1a;
  border-radius: 6px;
  color: #8b1a05;
  display: none;
}

.error-msg.active {
  display: block;
}

/* ── BOOKS GRID ─────────────────────────────────────────── */
.books-grid {
  max-width: 1200px;
  margin: 2rem auto;
  padding: 0 1.5rem 2rem;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 1.5rem;
}

/* ── BOOK CARD ──────────────────────────────────────────── */
.book-card {
  background: var(--bg-card);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: transform 0.25s ease, box-shadow 0.25s ease, background 0.3s, border-color 0.3s;
  display: flex;
  flex-direction: column;
  animation: fadeUp 0.4s ease both;
}

.book-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-hover);
}

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(20px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* Stagger card animations */
.book-card:nth-child(1)  { animation-delay: 0.03s; }
.book-card:nth-child(2)  { animation-delay: 0.06s; }
.book-card:nth-child(3)  { animation-delay: 0.09s; }
.book-card:nth-child(4)  { animation-delay: 0.12s; }
.book-card:nth-child(5)  { animation-delay: 0.15s; }
.book-card:nth-child(6)  { animation-delay: 0.18s; }
.book-card:nth-child(7)  { animation-delay: 0.21s; }
.book-card:nth-child(8)  { animation-delay: 0.24s; }
.book-card:nth-child(9)  { animation-delay: 0.27s; }
.book-card:nth-child(10) { animation-delay: 0.30s; }

.book-cover-wrapper {
  width: 100%;
  aspect-ratio: 2 / 3;
  background: var(--accent-light);
  overflow: hidden;
  position: relative;
}

.book-cover {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 0.4s ease;
}

.book-card:hover .book-cover {
  transform: scale(1.04);
}

.no-cover {
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--chip-bg), var(--accent-light));
  color: var(--text-secondary);
  font-size: 0.75rem;
  text-align: center;
  padding: 1rem;
  gap: 0.5rem;
}

.no-cover-icon {
  font-size: 2.5rem;
}

.book-info {
  padding: 0.9rem 1rem;
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}

.book-title {
  font-family: var(--font-display);
  font-size: 0.95rem;
  font-weight: 700;
  line-height: 1.3;
  color: var(--text-primary);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.book-author {
  font-size: 0.8rem;
  color: var(--accent);
  font-weight: 500;
  display: -webkit-box;
  -webkit-line-clamp: 1;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.book-year {
  font-size: 0.75rem;
  color: var(--text-secondary);
  margin-top: auto;
}

/* ── CARD ACTION BUTTONS ────────────────────────────────── */
.book-actions {
  padding: 0.5rem 0.8rem 0.8rem;
  display: flex;
  gap: 0.5rem;
}

.book-link {
  flex: 1;
  display: block;
  padding: 0.42rem;
  text-align: center;
  background: var(--accent-light);
  color: var(--accent-dark);
  border-radius: 6px;
  font-size: 0.78rem;
  font-weight: 500;
  text-decoration: none;
  border: 1.5px solid transparent;
  transition: background 0.2s, color 0.2s;
}

.book-link:hover {
  background: var(--accent);
  color: white;
}

.btn-fav {
  flex: 1;
  padding: 0.42rem;
  text-align: center;
  background: transparent;
  color: var(--text-secondary);
  border-radius: 6px;
  font-size: 0.78rem;
  font-weight: 500;
  border: 1.5px solid var(--border);
  cursor: pointer;
  font-family: var(--font-body);
  transition: all 0.2s ease;
}

.btn-fav:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-light);
}

.btn-fav.saved {
  background: #FFF3E0;
  border-color: #e07020;
  color: #c05010;
}

[data-theme="dark"] .btn-fav.saved {
  background: #2c1808;
  border-color: var(--accent);
  color: var(--accent);
}

/* ── EMPTY STATE ────────────────────────────────────────── */
.empty-state {
  text-align: center;
  padding: 5rem 1rem;
  color: var(--text-secondary);
}

.empty-icon {
  font-size: 3rem;
  display: block;
  margin-bottom: 1rem;
}

/* ── FOOTER ─────────────────────────────────────────────── */
.footer {
  text-align: center;
  padding: 2rem 1rem;
  color: var(--text-secondary);
  font-size: 0.82rem;
  border-top: 1px solid var(--border);
  margin-top: 2rem;
  transition: border-color 0.3s;
}

.footer a {
  color: var(--accent);
  text-decoration: none;
}

.footer a:hover {
  text-decoration: underline;
}

/* ── RESPONSIVE ─────────────────────────────────────────── */
@media (max-width: 768px) {
  .logo-text { font-size: 2rem; }

  .books-grid {
    grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
    gap: 1.2rem;
  }

  .controls-bar {
    flex-direction: column;
    align-items: flex-start;
  }
}

@media (max-width: 480px) {
  .logo-text { font-size: 1.6rem; }
  .logo-icon { font-size: 1.5rem; }

  .header {
    padding: 1.2rem 1rem 1.4rem;
  }

  .search-btn {
    padding: 1rem 1rem;
    font-size: 0.85rem;
  }

  .books-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
    padding: 0 1rem 2rem;
  }

  .book-info {
    padding: 0.7rem 0.8rem;
  }

  .book-title {
    font-size: 0.85rem;
  }
}

@media (max-width: 340px) {
  .books-grid {
    grid-template-columns: 1fr;
  }
}