/* =============================================
   LIBROVA — Book Search App
   Light & Clean Design System
   ============================================= */

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

:root {
  --bg:             #f4f6ff;
  --surface:        #ffffff;
  --surface-2:      #f0f2ff;
  --border:         #e4e7f0;
  --border-strong:  #c7cce8;

  --text-primary:   #1a1b2e;
  --text-secondary: #5a6080;
  --text-muted:     #9ca3c0;

  --accent:         #6c63ff;
  --accent-light:   #ede9ff;
  --accent-mid:     #c4beff;
  --accent-dark:    #4f46e5;
  --accent-glow:    rgba(108, 99, 255, 0.2);

  --green:          #059669;
  --green-light:    #ecfdf5;
  --red:            #dc2626;
  --red-light:      #fef2f2;
  --gold:           #d97706;
  --gold-light:     #fffbeb;

  --radius:    20px;
  --radius-sm: 14px;
  --radius-xs: 10px;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.06), 0 4px 12px rgba(0,0,0,0.05);
  --shadow:    0 4px 16px rgba(0,0,0,0.08), 0 1px 3px rgba(0,0,0,0.05);
  --shadow-lg: 0 12px 40px rgba(0,0,0,0.12), 0 4px 12px rgba(0,0,0,0.06);
  --t:         0.2s cubic-bezier(.4,0,.2,1);
}

html { scroll-behavior: smooth; }

body {
  font-family: 'Inter', system-ui, sans-serif;
  background: var(--bg);
  color: var(--text-primary);
  min-height: 100vh;
  overflow-x: hidden;
  line-height: 1.6;
}

/* ─── Remove dark blobs ─────────────────────── */
.bg-blob { display: none; }

/* ─── Header ───────────────────────────────── */
.header {
  position: sticky; top: 0; z-index: 90;
  background: rgba(255,255,255,0.9);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  box-shadow: 0 1px 0 var(--border), var(--shadow-sm);
}
.header-inner {
  max-width: 1200px; margin: 0 auto;
  padding: .85rem 1.5rem;
  display: flex; align-items: center; justify-content: space-between;
  gap: 1rem;
}
.logo { display:flex; align-items:center; gap:.55rem; flex-shrink:0; }
.logo-icon { font-size: 1.4rem; }
.logo-text {
  font-family: 'Playfair Display', serif;
  font-size: 1.3rem; font-weight: 800;
  background: linear-gradient(135deg, var(--accent), #a78bfa);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav { display:flex; align-items:center; gap:.4rem; }
.nav-btn {
  display: flex; align-items: center; gap: .4rem;
  background: transparent; border: 1.5px solid var(--border);
  border-radius: 100px; color: var(--text-secondary);
  font-family: 'Inter', sans-serif; font-size: .82rem; font-weight: 600;
  padding: .4rem .95rem; cursor: pointer; transition: var(--t);
  position: relative;
}
.nav-btn:hover {
  border-color: var(--accent-mid);
  color: var(--accent);
  background: var(--accent-light);
}
.nav-btn.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}
.nav-badge {
  background: #fff; color: var(--accent);
  font-size: .68rem; font-weight: 800;
  min-width: 18px; height: 18px;
  border-radius: 100px; padding: 0 4px;
  display: flex; align-items: center; justify-content: center;
}
.nav-btn.active .nav-badge { background: rgba(255,255,255,0.25); color: #fff; }

/* ─── Main ─────────────────────────────────── */
.main {
  max-width: 1200px; margin: 0 auto;
  padding: 0 1.5rem 5rem;
}

/* ─── Hero ─────────────────────────────────── */
.hero {
  text-align: center;
  padding: 4rem 1rem 2.5rem;
  max-width: 680px; margin: 0 auto;
}
.hero-title {
  font-family: 'Playfair Display', serif;
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 800; line-height: 1.15;
  margin-bottom: .9rem; letter-spacing: -.025em;
  color: var(--text-primary);
}
.hero-highlight {
  background: linear-gradient(135deg, var(--accent), #a78bfa);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-sub {
  color: var(--text-secondary); font-size: .95rem; margin-bottom: 1.75rem;
}

/* ─── Search Bar ───────────────────────────── */
.search-wrapper {
  position: relative; display: flex; align-items: center;
  max-width: 560px; margin: 0 auto 1.5rem;
}
.search-icon-left {
  position: absolute; left: 1.1rem;
  font-size: 1rem; pointer-events: none; z-index: 1;
}
.search-input {
  width: 100%; padding: .9rem 3.2rem .9rem 2.9rem;
  background: var(--surface);
  border: 1.5px solid var(--border);
  border-radius: 100px;
  color: var(--text-primary);
  font-family: 'Inter', sans-serif; font-size: .95rem;
  outline: none; transition: var(--t);
  box-shadow: var(--shadow-sm);
}
.search-input::placeholder { color: var(--text-muted); }
.search-input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 4px var(--accent-glow), var(--shadow-sm);
}
.search-clear {
  position: absolute; right: .85rem;
  background: var(--surface-2); border: none;
  color: var(--text-muted); font-size: .8rem;
  cursor: pointer; padding: .3rem .4rem;
  border-radius: 50%; transition: var(--t);
  display: flex; align-items: center; justify-content: center;
}
.search-clear:hover { background: var(--accent-light); color: var(--accent); }

/* ─── Category Pills ───────────────────────── */
.category-pills {
  display: flex; flex-wrap: wrap;
  gap: .45rem; justify-content: center;
}
.pill {
  background: var(--surface); border: 1.5px solid var(--border);
  border-radius: 100px; color: var(--text-secondary);
  font-family: 'Inter', sans-serif; font-size: .79rem; font-weight: 600;
  padding: .38rem .9rem; cursor: pointer;
  transition: var(--t); white-space: nowrap;
  box-shadow: var(--shadow-sm);
}
.pill:hover {
  border-color: var(--accent-mid); color: var(--accent);
  background: var(--accent-light); transform: translateY(-1px);
}
.pill.active {
  background: var(--accent); border-color: var(--accent);
  color: #fff; box-shadow: 0 4px 12px var(--accent-glow);
}

/* ─── Results Header ───────────────────────── */
.results-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: .25rem 0 1.1rem; flex-wrap: wrap; gap: .75rem;
}
.results-count { font-size: .84rem; color: var(--text-secondary); }
.results-count strong { color: var(--text-primary); }
.sort-wrapper { display:flex; align-items:center; gap:.5rem; }
.sort-label { font-size: .78rem; color: var(--text-muted); }
.sort-select {
  background: var(--surface); border: 1.5px solid var(--border);
  border-radius: var(--radius-xs); color: var(--text-primary);
  font-family: 'Inter', sans-serif; font-size: .82rem;
  padding: .3rem .7rem; outline: none; cursor: pointer; transition: var(--t);
  box-shadow: var(--shadow-sm);
}
.sort-select:focus { border-color: var(--accent); }

/* ─── Books Grid ───────────────────────────── */
.books-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(168px, 1fr));
  gap: 1.1rem;
}

/* ─── Book Card ────────────────────────────── */
.book-card {
  background: var(--surface); border: 1.5px solid var(--border);
  border-radius: var(--radius-sm); overflow: hidden;
  cursor: pointer; transition: var(--t);
  display: flex; flex-direction: column;
  animation: fadeUp .3s ease forwards;
  box-shadow: var(--shadow-sm);
}
.book-card:hover {
  transform: translateY(-5px);
  border-color: var(--accent-mid);
  box-shadow: var(--shadow-lg);
}
@keyframes fadeUp {
  from { opacity:0; transform:translateY(14px); }
  to   { opacity:1; transform:translateY(0); }
}

.book-cover-wrap {
  position: relative; width: 100%;
  aspect-ratio: 2/3; overflow: hidden;
  background: linear-gradient(135deg, var(--accent-light), #ede9ff);
  flex-shrink: 0;
}
.book-cover {
  width:100%; height:100%; object-fit:cover;
  display:block; transition: transform .5s ease;
}
.book-card:hover .book-cover { transform: scale(1.05); }

.book-no-cover {
  width:100%; height:100%;
  display: flex; flex-direction: column;
  align-items: center; justify-content: center;
  gap: .4rem; padding: 1rem; text-align: center;
}
.book-no-cover-icon { font-size: 2.2rem; opacity: .5; }
.book-no-cover-title {
  font-size: .7rem; font-weight: 600;
  color: var(--text-secondary); line-height: 1.3; word-break: break-word;
}

.book-bookmark-btn {
  position: absolute; top: .55rem; right: .55rem;
  width: 30px; height: 30px;
  background: rgba(255,255,255,0.92);
  border: 1px solid var(--border); border-radius: 8px;
  color: var(--text-muted); font-size: .85rem;
  display: flex; align-items: center; justify-content: center;
  cursor: pointer; transition: var(--t);
  opacity: 0; box-shadow: var(--shadow-sm);
}
.book-card:hover .book-bookmark-btn { opacity: 1; }
.book-bookmark-btn.saved {
  opacity: 1; background: var(--accent-light);
  border-color: var(--accent); color: var(--accent);
}
.book-bookmark-btn:hover {
  transform: scale(1.1);
  background: var(--accent-light); border-color: var(--accent); color: var(--accent);
}

.book-info {
  padding: .7rem .8rem; flex: 1;
  display: flex; flex-direction: column; gap: .18rem;
}
.book-title {
  font-size: .81rem; font-weight: 700;
  color: var(--text-primary); line-height: 1.3;
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical;
  line-clamp: 2;
  overflow: hidden;
}
.book-author { font-size: .72rem; color: var(--text-muted); white-space:nowrap; overflow:hidden; text-overflow:ellipsis; }
.book-year { font-size: .7rem; color: var(--text-muted); margin-top: auto; padding-top: .3rem; }
.book-rating {
  display: flex; align-items: center; gap: .2rem;
  font-size: .7rem; color: var(--gold); margin-top: .15rem;
}

/* ─── Skeleton ─────────────────────────────── */
.skeleton-card {
  border-radius: var(--radius-sm);
  aspect-ratio: 2/3.8;
  background: linear-gradient(
    90deg,
    #f0f2f8 25%, #e4e7f4 50%, #f0f2f8 75%
  );
  background-size: 200% 100%;
  animation: shimmer 1.4s infinite;
  border: 1.5px solid var(--border);
}
@keyframes shimmer {
  0%   { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

/* ─── Load More ────────────────────────────── */
.load-more-wrapper {
  display: flex; justify-content: center; padding: 2rem 0 0;
}
.btn-load-more {
  background: var(--surface); border: 1.5px solid var(--border);
  border-radius: 100px; color: var(--text-secondary);
  font-family: 'Inter', sans-serif; font-size: .88rem; font-weight: 600;
  padding: .7rem 2rem; cursor: pointer; transition: var(--t);
  box-shadow: var(--shadow-sm);
}
.btn-load-more:hover {
  background: var(--accent); border-color: var(--accent);
  color: #fff; transform: translateY(-2px); box-shadow: 0 4px 16px var(--accent-glow);
}

/* ─── Center States ────────────────────────── */
.center-state { text-align: center; padding: 5rem 1rem; }
.state-icon { font-size: 3.2rem; margin-bottom: 1rem; opacity: .5; }
.state-title { font-size: 1.15rem; font-weight: 700; margin-bottom: .4rem; color: var(--text-primary); }
.state-sub { font-size: .87rem; color: var(--text-secondary); }
.btn-retry {
  display: inline-block; margin-top: 1.25rem;
  background: var(--accent); border: none;
  border-radius: 100px; color: #fff;
  font-family: 'Inter', sans-serif; font-size: .87rem; font-weight: 600;
  padding: .6rem 1.5rem; cursor: pointer; transition: var(--t);
  box-shadow: 0 4px 12px var(--accent-glow);
}
.btn-retry:hover { background: var(--accent-dark); transform: translateY(-2px); }

/* ─── Reading List View ────────────────────── */
.reading-list-header {
  display: flex; align-items: flex-start; justify-content: space-between;
  padding: 2.5rem 0 1.5rem; gap: 1rem; flex-wrap: wrap;
}
.page-title {
  font-family: 'Playfair Display', serif;
  font-size: 1.75rem; font-weight: 800; letter-spacing: -.02em;
  color: var(--text-primary);
}
.page-sub { font-size: .84rem; color: var(--text-secondary); margin-top: .2rem; }
.btn-clear-list {
  background: var(--red-light); border: 1.5px solid #fca5a5;
  border-radius: var(--radius-xs); color: var(--red);
  font-family: 'Inter', sans-serif; font-size: .82rem; font-weight: 600;
  padding: .42rem 1rem; cursor: pointer; transition: var(--t); white-space: nowrap;
}
.btn-clear-list:hover { background: var(--red); color: #fff; border-color: var(--red); }

/* ─── Detail Panel ─────────────────────────── */
.panel-overlay {
  position: fixed; inset: 0; z-index: 200;
  background: rgba(0,0,0,0);
  backdrop-filter: blur(0px);
  pointer-events: none;
  transition: background .3s, backdrop-filter .3s;
}
.panel-overlay.open {
  background: rgba(30,35,80,0.35);
  backdrop-filter: blur(6px);
  pointer-events: all;
}
.detail-panel {
  position: absolute; top: 0; right: 0; bottom: 0;
  width: min(460px, 100vw);
  background: var(--surface);
  border-left: 1.5px solid var(--border);
  box-shadow: -8px 0 40px rgba(0,0,0,0.12);
  transform: translateX(100%);
  transition: transform .38s cubic-bezier(.4,0,.2,1);
  display: flex; flex-direction: column; overflow: hidden;
}
.panel-overlay.open .detail-panel { transform: translateX(0); }

.panel-close {
  position: absolute; top: 1rem; right: 1rem; z-index: 10;
  width: 34px; height: 34px;
  background: var(--surface-2); border: 1.5px solid var(--border);
  border-radius: 50%; color: var(--text-secondary);
  font-size: .85rem; cursor: pointer; transition: var(--t);
  display: flex; align-items: center; justify-content: center;
  box-shadow: var(--shadow-sm);
}
.panel-close:hover {
  background: var(--accent-light); border-color: var(--accent);
  color: var(--accent); transform: rotate(90deg);
}

.panel-scroll { overflow-y: auto; flex: 1; }
.panel-scroll::-webkit-scrollbar { width: 4px; }
.panel-scroll::-webkit-scrollbar-thumb { background: var(--border-strong); border-radius: 4px; }

.panel-cover-wrap {
  position: relative; width: 100%; height: 290px;
  overflow: hidden; flex-shrink: 0;
  background: linear-gradient(135deg, var(--accent-light), #ede9ff);
}
.panel-cover {
  width: 100%; height: 100%; object-fit: cover;
  display: block;
}
.panel-cover-glow {
  position: absolute; inset: 0;
  background: linear-gradient(to top, var(--surface) 0%, transparent 50%);
}

.panel-info { padding: 1.4rem 1.5rem 2rem; }

.panel-categories {
  display: flex; flex-wrap: wrap; gap: .35rem; margin-bottom: .7rem;
}
.panel-cat-tag {
  background: var(--accent-light); border: 1px solid var(--accent-mid);
  border-radius: 100px; color: var(--accent);
  font-size: .68rem; font-weight: 700;
  padding: .18rem .65rem; letter-spacing: .04em; text-transform: uppercase;
}

.panel-title {
  font-family: 'Playfair Display', serif;
  font-size: 1.45rem; font-weight: 800; line-height: 1.2;
  margin-bottom: .35rem; letter-spacing: -.01em; color: var(--text-primary);
}
.panel-authors { font-size: .87rem; color: var(--text-secondary); margin-bottom: 1.25rem; }

.panel-meta {
  display: grid; grid-template-columns: 1fr 1fr;
  gap: .65rem; margin-bottom: 1.2rem;
  background: var(--surface-2); border: 1.5px solid var(--border);
  border-radius: var(--radius-sm); padding: 1rem;
}
.meta-item { display: flex; flex-direction: column; gap: .12rem; }
.meta-label { font-size: .67rem; color: var(--text-muted); text-transform: uppercase; letter-spacing: .06em; font-weight: 700; }
.meta-value { font-size: .84rem; color: var(--text-primary); font-weight: 600; }

.panel-rating {
  display: flex; align-items: center; gap: .5rem; margin-bottom: 1rem;
}
.stars { font-size: .9rem; color: var(--gold); }
.rating-count { font-size: .77rem; color: var(--text-muted); }

.panel-desc {
  font-size: .87rem; color: var(--text-secondary); line-height: 1.8;
  margin-bottom: 1.5rem;
}

.panel-actions { display: flex; flex-direction: column; gap: .65rem; }

.btn-bookmark-panel {
  display: flex; align-items: center; justify-content: center; gap: .5rem;
  width: 100%; padding: .8rem;
  background: var(--accent); border: none;
  border-radius: var(--radius-xs); color: #fff;
  font-family: 'Inter', sans-serif; font-size: .9rem; font-weight: 700;
  cursor: pointer; transition: var(--t);
  box-shadow: 0 4px 14px var(--accent-glow);
}
.btn-bookmark-panel:hover { background: var(--accent-dark); transform: translateY(-1px); }
.btn-bookmark-panel.saved {
  background: var(--gold-light); border: 1.5px solid #fcd34d; color: var(--gold);
  box-shadow: none;
}
.btn-bookmark-panel.saved:hover { background: var(--gold); color: #fff; border-color: var(--gold); }

.btn-preview {
  display: flex; align-items: center; justify-content: center; gap: .5rem;
  width: 100%; padding: .72rem;
  background: var(--surface-2); border: 1.5px solid var(--border);
  border-radius: var(--radius-xs); color: var(--text-secondary);
  font-family: 'Inter', sans-serif; font-size: .87rem; font-weight: 600;
  text-decoration: none; transition: var(--t);
}
.btn-preview:hover {
  background: var(--accent-light); border-color: var(--accent); color: var(--accent);
}

/* ─── Toast ────────────────────────────────── */
.toast {
  position: fixed; bottom: 2rem; left: 50%;
  transform: translateX(-50%) translateY(70px);
  background: var(--text-primary); border-radius: var(--radius-sm);
  padding: .7rem 1.4rem;
  font-size: .84rem; font-weight: 600; color: #fff;
  z-index: 999;
  transition: transform .38s cubic-bezier(.4,0,.2,1), opacity .38s;
  opacity: 0; pointer-events: none;
  white-space: nowrap; box-shadow: var(--shadow-lg);
}
.toast.show { transform: translateX(-50%) translateY(0); opacity: 1; }

/* ─── Responsive ───────────────────────────── */
@media (max-width: 768px) {
  .hero { padding: 2.5rem .5rem 1.5rem; }
  .books-grid { grid-template-columns: repeat(auto-fill, minmax(138px, 1fr)); gap: .8rem; }
  .detail-panel { width: 100vw; }
}
@media (max-width: 480px) {
  .books-grid { grid-template-columns: repeat(2, 1fr); }
  .nav-btn .nav-icon { display: none; }
  .nav-btn { padding: .4rem .65rem; font-size: .8rem; }
}