@import url('https://fonts.googleapis.com/css2?family=Playfair+Display:ital,wght@0,400;0,700;1,400&family=Source+Sans+3:wght@300;400;500;600&display=swap');

:root {
  --bg-primary: #14181c;
  --bg-secondary: #1c2228;
  --bg-card: #1f2833;
  --bg-hover: #252d36;
  --accent: #40bcf4;
  --accent-green: #00b020;
  --accent-orange: #f4a136;
  --text-primary: #d8d8d8;
  --text-secondary: #99aabb;
  --text-muted: #67788a;
  --border: #2c3440;
  --star-filled: #f4c542;
  --star-empty: #3a4555;
  --shelf-wood: #382512;
  --shelf-wood-light: #4b3013;
  --shelf-wood-mid: #5a3918;
  --shelf-wood-dark: #24170b;
  --shelf-edge: #3f2709;
  --header-height: 56px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
  font-family: 'Source Sans 3', 'Helvetica Neue', sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
  font-size: 15px;
  line-height: 1.5;
}

/* ─── HEADER ─────────────────────────────────────────────── */
header {
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-height);
}

.header-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
  height: 100%;
  display: flex;
  align-items: center;
  gap: 32px;
}

.logo {
  font-family: 'Playfair Display', serif;
  font-size: 22px;
  font-weight: 700;
  color: #fff;
  text-decoration: none;
  letter-spacing: -0.5px;
  flex-shrink: 0;
}
.logo span { color: var(--accent); }

nav { display: flex; gap: 4px; }

nav a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 13px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 6px 10px;
  border-radius: 3px;
  transition: color 0.15s, background 0.15s;
}
nav a:hover, nav a.active { color: #fff; background: rgba(255,255,255,0.06); }

.header-search { flex: 1; max-width: 340px; margin-left: auto; }
.header-search input {
  width: 100%;
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 7px 16px;
  color: var(--text-primary);
  font-size: 13px;
  font-family: inherit;
  outline: none;
  transition: border-color 0.2s;
}
.header-search input:focus { border-color: var(--accent); }
.header-search input::placeholder { color: var(--text-muted); }

.profile-link {
  display: flex; align-items: center; gap: 8px;
  text-decoration: none; color: var(--text-secondary);
  font-size: 13px; font-weight: 500;
  padding: 6px 10px; border-radius: 3px;
  transition: color 0.15s; flex-shrink: 0;
}
.profile-link:hover { color: #fff; }

.profile-avatar {
  width: 28px; height: 28px; border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), var(--accent-green));
  display: flex; align-items: center; justify-content: center;
  font-size: 11px; font-weight: 700; color: #fff;
}

/* ─── PAGES ──────────────────────────────────────────────── */
.page { display: none; }
.page.active { display: block; }

main { max-width: 1200px; margin: 0 auto; padding: 32px 20px 60px; }

/* ─── HERO ───────────────────────────────────────────────── */
.hero {
  background: linear-gradient(160deg, #1a2a3a 0%, var(--bg-secondary) 60%, var(--bg-primary) 100%);
  border-bottom: 1px solid var(--border);
  padding: 48px 0 40px;
  margin-bottom: 40px;
}
.hero-inner { max-width: 1200px; margin: 0 auto; padding: 0 20px; }
.hero h1 {
  font-family: 'Playfair Display', serif;
  font-size: 42px; font-weight: 700; color: #fff;
  line-height: 1.15; margin-bottom: 10px;
}
.hero h1 em { font-style: italic; color: var(--accent); }
.hero p { color: var(--text-secondary); font-size: 16px; max-width: 520px; margin-bottom: 24px; }
.hero-actions { display: flex; gap: 12px; }

/* ─── BUTTONS ────────────────────────────────────────────── */
.btn {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 9px 20px; border-radius: 4px;
  font-size: 13px; font-weight: 600; font-family: inherit;
  cursor: pointer; border: none; text-decoration: none;
  transition: all 0.15s; letter-spacing: 0.03em;
}
.btn-primary { background: var(--accent); color: #14181c; }
.btn-primary:hover { background: #5fceff; }
.btn-secondary { background: transparent; color: var(--text-secondary); border: 1px solid var(--border); }
.btn-secondary:hover { border-color: var(--text-muted); color: var(--text-primary); }
.btn-sm { padding: 5px 12px; font-size: 12px; }

/* ─── SECTION HEADERS ────────────────────────────────────── */
.section-header {
  display: flex; align-items: baseline;
  justify-content: space-between;
  margin-bottom: 16px;
  border-bottom: 1px solid var(--border);
  padding-bottom: 12px;
}
.section-header h2 {
  font-family: 'Playfair Display', serif;
  font-size: 20px; font-weight: 700; color: #fff;
}
.section-header a { font-size: 12px; color: var(--accent); text-decoration: none; font-weight: 500; }
.section-header a:hover { text-decoration: underline; }

/* ─── BOOKSHELF ──────────────────────────────────────────── */
.shelf-section { margin-bottom: 52px; }

.bookshelf-wrap {
  position: relative;
  display: flex;
  align-items: stretch;
}

.bookshelf {
  flex: 1;
  overflow: hidden;
  position: relative;
}

.shelf-track {
  display: flex;
  gap: 2px;
  overflow-x: auto;
  scroll-behavior: smooth;
  scrollbar-width: none;
  padding: 16px 4px 0;
  align-items: flex-end;
}
.shelf-track::-webkit-scrollbar { display: none; }

/* Each book on the shelf */
.shelf-track .book-card {
  flex: 0 0 auto;
  width: 110px;
  margin-right: 6px;
  margin-bottom: 6px;
  cursor: pointer;
}

.shelf-track .book-cover-wrap {
  aspect-ratio: 2/3;
  width: 110px;
  border-radius: 3px 4px 4px 3px;
  overflow: hidden;
  background: var(--bg-card);
  transition: transform 0.2s, box-shadow 0.2s;
  /* subtle spine shadow on left edge */
  box-shadow: -3px 0 6px rgba(0,0,0,0.4), inset -2px 0 4px rgba(0,0,0,0.2);
  margin-bottom: 0;
  position: relative;
}

.shelf-track .book-card:hover .book-cover-wrap {
  transform: translateY(-10px);
  box-shadow: -3px 0 6px rgba(0,0,0,0.4), 0 16px 32px rgba(0,0,0,0.6), inset -2px 0 4px rgba(0,0,0,0.2);
}

.shelf-plank {
  position: relative;
  height: 18px;
  border-radius: 2px;
  overflow: hidden;

  background:
    /* subtle top sheen */
    linear-gradient(
      to bottom,
      rgba(255,255,255,0.08) 0%,
      rgba(255,255,255,0.02) 12%,
      rgba(0,0,0,0) 30%
    ),

    /* soft uneven wood tone */
    linear-gradient(
      180deg,
      var(--shelf-wood-light) 0%,
      var(--shelf-wood-mid) 38%,
      var(--shelf-wood) 68%,
      var(--shelf-edge) 100%
    ),

    /* broad organic grain bands */
    repeating-linear-gradient(
      90deg,
      rgba(255,255,255,0.03) 0px,
      rgba(255,255,255,0.03) 18px,
      rgba(0,0,0,0.04) 26px,
      rgba(0,0,0,0.04) 52px,
      rgba(255,255,255,0.02) 66px,
      rgba(0,0,0,0.05) 92px,
      rgba(255,255,255,0.015) 120px
    );

  box-shadow:
    0 4px 12px rgba(0,0,0,0.55),
    inset 0 1px 0 rgba(255,255,255,0.06),
    inset 0 -1px 0 rgba(0,0,0,0.45);
}

/* fine grain detail */
.shelf-plank::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  pointer-events: none;
  opacity: 0.55;

  background:
    repeating-linear-gradient(
      90deg,
      rgba(0,0,0,0.035) 0px,
      rgba(0,0,0,0.035) 1px,
      transparent 1px,
      transparent 7px,
      rgba(255,255,255,0.018) 7px,
      rgba(255,255,255,0.018) 8px,
      transparent 8px,
      transparent 16px
    );

  transform: scaleY(1.4);
}

/* irregular darker figure / knots */
.shelf-plank::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  pointer-events: none;
  opacity: 0.35;

  background:
    radial-gradient(
      ellipse at 22% 55%,
      rgba(0,0,0,0.16) 0%,
      rgba(0,0,0,0.08) 10%,
      transparent 26%
    ),
    radial-gradient(
      ellipse at 68% 35%,
      rgba(255,255,255,0.05) 0%,
      rgba(255,255,255,0.02) 8%,
      transparent 22%
    ),
    radial-gradient(
      ellipse at 82% 60%,
      rgba(0,0,0,0.12) 0%,
      rgba(0,0,0,0.05) 12%,
      transparent 24%
    );
}

/* shelf arrow buttons */
.shelf-arrow {
  position: absolute;
  top: 50%;
  transform: translateY(-60%);
  z-index: 10;
  width: 36px;
  height: 36px;
  background: rgba(20,24,28,0.85);
  border: 1px solid var(--border);
  border-radius: 50%;
  color: var(--text-primary);
  font-size: 24px;
  line-height: 1;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.15s, opacity 0.15s;
  opacity: 0;
  backdrop-filter: blur(4px);
}

.bookshelf-wrap:hover .shelf-arrow { opacity: 1; }
.shelf-arrow:hover { background: var(--bg-hover); }

.shelf-arrow-left { left: -18px; }
.shelf-arrow-right { right: -18px; }

/* hide book-info text below covers on shelf */
.shelf-track .book-info { display: none; }

/* overlay still works */
.shelf-track .book-overlay {
  position: absolute;
  inset: 0;
  background: rgba(0,0,0,0.65);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity 0.2s;
  border-radius: 3px 4px 4px 3px;
}
.shelf-track .book-card:hover .book-overlay { opacity: 1; }

/* ─── NORMAL BOOK GRID (search results etc) ──────────────── */
.books-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 20px;
}
.books-grid.large {
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
}

.book-card { position: relative; cursor: pointer; }

.book-cover-wrap {
  position: relative;
  aspect-ratio: 2/3;
  border-radius: 4px;
  overflow: hidden;
  background: var(--bg-card);
  margin-bottom: 8px;
  transition: transform 0.2s;
}
.book-card:hover .book-cover-wrap { transform: translateY(-3px); box-shadow: 0 12px 30px rgba(0,0,0,0.5); }

.book-cover { width: 100%; height: 100%; object-fit: cover; display: block; }

.book-cover-placeholder {
  width: 100%; height: 100%;
  display: flex; flex-direction: column;
  align-items: center; justify-content: center;
  padding: 12px;
  background: linear-gradient(135deg, #1f2d3d, #152030);
  text-align: center;
}
.book-cover-placeholder .placeholder-title {
  font-family: 'Playfair Display', serif;
  font-size: 11px; color: var(--text-secondary);
  line-height: 1.3; margin-top: 8px; word-break: break-word;
}
.book-cover-placeholder svg { opacity: 0.3; flex-shrink: 0; }

.book-overlay {
  position: absolute; inset: 0;
  background: rgba(0,0,0,0.7);
  display: flex; align-items: center; justify-content: center;
  opacity: 0; transition: opacity 0.2s; border-radius: 4px;
}
.book-card:hover .book-overlay { opacity: 1; }

.overlay-actions { display: flex; gap: 8px; }

.overlay-btn {
  width: 36px; height: 36px; border-radius: 50%;
  border: 2px solid rgba(255,255,255,0.8);
  background: rgba(0,0,0,0.4);
  color: #fff; display: flex; align-items: center; justify-content: center;
  cursor: pointer; transition: all 0.15s; font-size: 14px;
}
.overlay-btn:hover { background: rgba(255,255,255,0.2); }
.overlay-btn.read { border-color: var(--accent-green); color: var(--accent-green); }
.overlay-btn.rated { border-color: var(--star-filled); color: var(--star-filled); }

.read-badge {
  position: absolute; top: 6px; right: 6px;
  width: 20px; height: 20px;
  background: var(--accent-green); border-radius: 50%;
  display: flex; align-items: center; justify-content: center; font-size: 10px;
}

.book-info { padding: 0 2px; }
.book-title { font-size: 13px; font-weight: 500; color: var(--text-primary); line-height: 1.3; margin-bottom: 2px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.book-author { font-size: 12px; color: var(--text-muted); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.book-rating { display: flex; gap: 1px; margin-top: 4px; }
.star { font-size: 10px; color: var(--star-empty); }
.star.filled { color: var(--star-filled); }

/* ─── LISTS PAGE ─────────────────────────────────────────── */
.lists-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 24px;
}

.list-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
  cursor: pointer;
  transition: border-color 0.2s, transform 0.2s;
}
.list-card:hover { border-color: var(--accent); transform: translateY(-2px); }

.list-card-books {
  display: flex;
  height: 120px;
  overflow: hidden;
  background: var(--bg-primary);
}

.list-card-books img {
  flex: 1;
  object-fit: cover;
  border-right: 2px solid var(--bg-primary);
}

.list-card-books .list-placeholder-cover {
  flex: 1;
  background: linear-gradient(135deg, #1f2d3d, #152030);
  border-right: 2px solid var(--bg-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
}

.list-card-info { padding: 16px; }
.list-card-title { font-family: 'Playfair Display', serif; font-size: 16px; font-weight: 700; color: #fff; margin-bottom: 4px; }
.list-card-meta { font-size: 12px; color: var(--accent); margin-bottom: 8px; text-transform: uppercase; letter-spacing: 0.06em; }
.list-card-desc { font-size: 13px; color: var(--text-muted); line-height: 1.5; }

/* ─── LIST DETAIL ────────────────────────────────────────── */
.list-detail-header {
  background: linear-gradient(160deg, #1a2535, var(--bg-secondary));
  border-bottom: 1px solid var(--border);
  padding: 40px 0 32px;
}
.list-detail-header-inner {
  max-width: 1200px; margin: 0 auto; padding: 0 20px;
}
.list-detail-back {
  background: none; border: none;
  color: var(--text-muted); font-size: 13px; font-family: inherit;
  cursor: pointer; padding: 0; margin-bottom: 16px;
  display: flex; align-items: center; gap: 6px;
  transition: color 0.15s;
}
.list-detail-back:hover { color: var(--text-primary); }
.list-detail-title {
  font-family: 'Playfair Display', serif;
  font-size: 32px; font-weight: 700; color: #fff; margin-bottom: 6px;
}
.list-detail-meta { font-size: 14px; color: var(--text-muted); }

.list-progress-bar-wrap {
  margin-top: 20px;
  max-width: 400px;
}
.list-progress-label { font-size: 13px; color: var(--text-secondary); margin-bottom: 6px; }
.list-progress-bar {
  height: 6px; background: var(--bg-card); border-radius: 3px; overflow: hidden;
}
.list-progress-fill {
  height: 100%; background: var(--accent-green); border-radius: 3px;
  transition: width 0.4s ease;
}

/* ─── SEARCH PAGE ────────────────────────────────────────── */
.search-hero { background: var(--bg-secondary); border-bottom: 1px solid var(--border); padding: 32px 0; margin-bottom: 32px; }
.search-hero-inner { max-width: 1200px; margin: 0 auto; padding: 0 20px; }
.search-hero h2 { font-family: 'Playfair Display', serif; font-size: 28px; color: #fff; margin-bottom: 16px; }

.search-bar { display: flex; gap: 10px; max-width: 600px; }
.search-bar input {
  flex: 1; background: var(--bg-primary); border: 1px solid var(--border);
  border-radius: 4px; padding: 10px 16px; color: var(--text-primary);
  font-size: 15px; font-family: inherit; outline: none; transition: border-color 0.2s;
}
.search-bar input:focus { border-color: var(--accent); }
.search-bar input::placeholder { color: var(--text-muted); }
.search-bar button {
  background: var(--accent); color: #14181c; border: none; border-radius: 4px;
  padding: 10px 20px; font-size: 14px; font-weight: 600; font-family: inherit;
  cursor: pointer; transition: background 0.15s;
}
.search-bar button:hover { background: #5fceff; }

.search-filters { display: flex; gap: 8px; margin-top: 12px; flex-wrap: wrap; }
.filter-chip {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: 20px; padding: 4px 12px; font-size: 12px;
  color: var(--text-secondary); cursor: pointer; transition: all 0.15s;
}
.filter-chip:hover, .filter-chip.active { border-color: var(--accent); color: var(--accent); background: rgba(64,188,244,0.08); }
.search-results-info { margin-bottom: 20px; color: var(--text-muted); font-size: 14px; }

/* ─── BOOK DETAIL ────────────────────────────────────────── */
.book-detail-backdrop { background: linear-gradient(to bottom, #1a2535, var(--bg-primary)); padding: 40px 0 0; }
.book-detail-inner {
  max-width: 1200px; margin: 0 auto; padding: 0 20px 40px;
  display: grid; grid-template-columns: 220px 1fr; gap: 40px; align-items: start;
}
.book-detail-cover { width: 100%; aspect-ratio: 2/3; object-fit: cover; border-radius: 6px; box-shadow: 0 20px 50px rgba(0,0,0,0.6); }
.book-detail-cover-placeholder {
  width: 100%; aspect-ratio: 2/3;
  background: linear-gradient(135deg, #1f2d3d, #152030);
  border-radius: 6px; box-shadow: 0 20px 50px rgba(0,0,0,0.6);
  display: flex; flex-direction: column; align-items: center; justify-content: center; padding: 20px; text-align: center;
}
.book-detail-cover-placeholder p { font-family: 'Playfair Display', serif; font-size: 16px; color: var(--text-secondary); margin-top: 12px; }
.book-detail-info { padding-top: 4px; }
.book-detail-year { font-size: 13px; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.08em; margin-bottom: 6px; }
.book-detail-title { font-family: 'Playfair Display', serif; font-size: 36px; font-weight: 700; color: #fff; line-height: 1.2; margin-bottom: 6px; }
.book-detail-author { font-size: 17px; color: var(--text-secondary); margin-bottom: 20px; }
.book-detail-author a { color: var(--accent); text-decoration: none; }
.detail-meta { display: flex; gap: 20px; margin-bottom: 24px; flex-wrap: wrap; }
.meta-item { display: flex; flex-direction: column; gap: 2px; }
.meta-label { font-size: 10px; text-transform: uppercase; letter-spacing: 0.1em; color: var(--text-muted); }
.meta-value { font-size: 15px; color: var(--text-primary); font-weight: 500; }
.detail-actions { display: flex; gap: 10px; margin-bottom: 28px; flex-wrap: wrap; align-items: center; }
.detail-action-btn {
  display: flex; align-items: center; gap: 6px; padding: 9px 18px; border-radius: 4px;
  font-size: 13px; font-weight: 600; font-family: inherit; cursor: pointer;
  border: 1px solid var(--border); background: var(--bg-card); color: var(--text-secondary); transition: all 0.15s;
}
.detail-action-btn:hover { border-color: var(--text-muted); color: var(--text-primary); }
.detail-action-btn.active-read { background: rgba(0,176,32,0.15); border-color: var(--accent-green); color: var(--accent-green); }
.detail-action-btn.active-fav { background: rgba(244,161,54,0.15); border-color: var(--accent-orange); color: var(--accent-orange); }
.detail-rating { display: flex; align-items: center; gap: 4px; padding: 8px 16px; background: var(--bg-card); border: 1px solid var(--border); border-radius: 4px; }
.detail-rating-label { font-size: 12px; color: var(--text-muted); margin-right: 4px; }
.detail-star { font-size: 22px; color: var(--star-empty); cursor: pointer; transition: color 0.1s, transform 0.1s; line-height: 1; }
.detail-star:hover { transform: scale(1.2); }
.detail-star.filled { color: var(--star-filled); }
.detail-star.hover-fill { color: var(--star-filled); }
.book-description { font-size: 15px; color: var(--text-secondary); line-height: 1.7; max-width: 680px; }
.book-description.collapsed { display: -webkit-box; -webkit-line-clamp: 4; -webkit-box-orient: vertical; overflow: hidden; }
.read-more-btn { background: none; border: none; color: var(--accent); font-size: 13px; cursor: pointer; font-family: inherit; padding: 4px 0; margin-top: 4px; }
.detail-tabs-section { max-width: 1200px; margin: 0 auto; padding: 32px 20px 60px; }
.tabs { display: flex; gap: 0; border-bottom: 1px solid var(--border); margin-bottom: 28px; }
.tab-btn {
  background: none; border: none; border-bottom: 2px solid transparent;
  padding: 10px 18px; font-size: 13px; font-weight: 600; font-family: inherit;
  color: var(--text-muted); cursor: pointer; text-transform: uppercase; letter-spacing: 0.06em;
  margin-bottom: -1px; transition: color 0.15s, border-color 0.15s;
}
.tab-btn:hover { color: var(--text-primary); }
.tab-btn.active { color: var(--accent); border-bottom-color: var(--accent); }

/* ─── PROFILE ────────────────────────────────────────────── */
.profile-header-section { background: var(--bg-secondary); border-bottom: 1px solid var(--border); padding: 32px 0; }
.profile-header-inner { max-width: 1200px; margin: 0 auto; padding: 0 20px; display: flex; align-items: center; gap: 24px; }
.profile-big-avatar {
  width: 80px; height: 80px; border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), var(--accent-green));
  display: flex; align-items: center; justify-content: center;
  font-size: 28px; font-weight: 700; color: #fff; flex-shrink: 0;
}
.profile-name { font-family: 'Playfair Display', serif; font-size: 28px; font-weight: 700; color: #fff; margin-bottom: 4px; }
.profile-stats { display: flex; gap: 24px; margin-top: 12px; }
.stat-item { text-align: center; }
.stat-clickable { cursor: pointer; border-radius: 8px; padding: 4px 8px; transition: background 0.15s; }
.stat-clickable:hover { background: rgba(255,255,255,0.08); }
.stat-num { font-size: 22px; font-weight: 700; color: #fff; display: block; font-family: 'Playfair Display', serif; }
.stat-label { font-size: 11px; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.08em; }
.edit-profile-form { display: flex; flex-direction: column; gap: 8px; margin-top: 8px; min-width: 220px; }
.edit-profile-form input, .edit-profile-form textarea { background: var(--bg-primary); border: 1px solid var(--border); border-radius: 4px; padding: 6px 12px; color: var(--text-primary); font-size: 13px; font-family: inherit; outline: none; width: 100%; }
.edit-profile-form input:focus { border-color: var(--accent); }

/* ─── FAVORITES ──────────────────────────────────────────── */
.favorites-section { margin-bottom: 40px; }
.favorites-section h3 { font-family: 'Playfair Display', serif; font-size: 18px; font-weight: 700; color: #fff; margin-bottom: 16px; display: flex; align-items: center; gap: 8px; }
.favorites-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.fav-slot { aspect-ratio: 2/3; border-radius: 6px; overflow: hidden; position: relative; background: var(--bg-card); border: 2px dashed var(--border); cursor: pointer; transition: border-color 0.2s; }
.fav-slot:hover { border-color: var(--text-muted); }
.fav-slot.filled { border: none; background: #0d1117; }
.fav-slot img { width: 100%; height: 100%; object-fit: contain; background: #0d1117; }
.fav-slot-empty { width: 100%; height: 100%; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 8px; color: var(--text-muted); font-size: 12px; }
.fav-slot-overlay { position: absolute; inset: 0; background: rgba(0,0,0,0.6); display: flex; align-items: flex-end; padding: 10px; gap: 6px; opacity: 0; transition: opacity 0.2s; }
.fav-slot:hover .fav-slot-overlay { opacity: 1; }
.fav-slot-overlay button { border: none; color: #fff; padding: 4px 10px; border-radius: 3px; font-size: 11px; font-family: inherit; cursor: pointer; font-weight: 600; }
.fav-remove-btn { background: rgba(255,50,50,0.8); }
.fav-open-btn { background: rgba(64,188,244,0.8); }
.fav-slot-title { position: absolute; bottom: 0; left: 0; right: 0; padding: 6px 8px; background: linear-gradient(transparent, rgba(0,0,0,0.8)); font-size: 11px; color: #ccc; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; pointer-events: none; }
.fav-slot:hover .fav-slot-title { opacity: 0; }
.fav-slot-placeholder { width: 100%; height: 100%; background: linear-gradient(135deg, #1f2d3d, #152030); display: flex; align-items: center; justify-content: center; padding: 10px; text-align: center; }
.fav-slot-placeholder span { font-family: 'Playfair Display', serif; font-size: 11px; color: var(--text-secondary); line-height: 1.3; }

/* ─── BACK BUTTON ────────────────────────────────────────── */
.detail-back-bar { max-width: 1200px; margin: 0 auto; padding: 16px 20px 0; }
.back-btn { background: none; border: none; color: var(--text-muted); font-family: inherit; font-size: 14px; cursor: pointer; padding: 4px 0; transition: color 0.2s; }
.back-btn:hover { color: var(--accent); }

/* ─── PROFILE BIO ────────────────────────────────────────── */
.profile-bio { color: var(--text-secondary); font-size: 14px; line-height: 1.5; margin: 4px 0 6px; max-width: 400px; }
.edit-profile-form textarea { width: 100%; padding: 8px 10px; background: var(--bg-card); border: 1px solid var(--border); border-radius: 6px; color: var(--text-primary); font-size: 13px; font-family: inherit; }
.edit-profile-form textarea:focus { border-color: var(--accent); outline: none; }

/* ─── READ LIST ──────────────────────────────────────────── */
.books-list { display: flex; flex-direction: column; gap: 1px; }
.book-list-item { display: flex; align-items: center; gap: 16px; padding: 12px; background: var(--bg-secondary); border-radius: 4px; cursor: pointer; transition: background 0.15s; }
.book-list-item:hover { background: var(--bg-hover); }
.book-list-cover { width: 40px; height: 60px; object-fit: cover; border-radius: 2px; flex-shrink: 0; background: var(--bg-card); }
.book-list-cover-placeholder { width: 40px; height: 60px; background: var(--bg-card); border-radius: 2px; flex-shrink: 0; display: flex; align-items: center; justify-content: center; }
.book-list-info { flex: 1; min-width: 0; }
.book-list-title { font-size: 14px; font-weight: 500; color: var(--text-primary); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; margin-bottom: 2px; }
.book-list-author { font-size: 12px; color: var(--text-muted); }
.book-list-rating { display: flex; gap: 2px; }
.book-list-rating .star { font-size: 12px; }
.date-read { font-size: 11px; color: var(--text-muted); margin-top: 2px; }

/* ─── LOADING ────────────────────────────────────────────── */
.skeleton { border-radius: 4px; background: linear-gradient(90deg, var(--bg-card) 25%, var(--bg-hover) 50%, var(--bg-card) 75%); background-size: 200% 100%; animation: shimmer 1.5s infinite; }
.skeleton-cover { aspect-ratio: 2/3; border-radius: 4px; }
.skeleton-line { height: 12px; border-radius: 3px; margin-top: 8px; }
.skeleton-line.short { width: 60%; }
@keyframes shimmer { 0% { background-position: 200% 0; } 100% { background-position: -200% 0; } }

.empty-state { text-align: center; padding: 60px 20px; color: var(--text-muted); }
.empty-state svg { margin-bottom: 16px; opacity: 0.3; }
.empty-state h3 { font-size: 18px; color: var(--text-secondary); margin-bottom: 8px; }

/* ─── TOAST ──────────────────────────────────────────────── */
.toast-container { position: fixed; bottom: 24px; right: 24px; z-index: 9999; display: flex; flex-direction: column; gap: 8px; }
.toast { background: var(--bg-hover); border: 1px solid var(--border); border-left: 3px solid var(--accent-green); border-radius: 6px; padding: 12px 16px; font-size: 13px; color: var(--text-primary); min-width: 240px; box-shadow: 0 8px 24px rgba(0,0,0,0.4); animation: toastIn 0.25s ease; }
.toast.error { border-left-color: #e74c3c; }
.toast.info { border-left-color: var(--accent); }
@keyframes toastIn { from { transform: translateX(20px); opacity: 0; } to { transform: translateX(0); opacity: 1; } }

/* ─── MODAL ──────────────────────────────────────────────── */
.modal-overlay { position: fixed; inset: 0; background: rgba(0,0,0,0.75); z-index: 1000; display: flex; align-items: center; justify-content: center; padding: 20px; opacity: 0; pointer-events: none; transition: opacity 0.2s; }
.modal-overlay.open { opacity: 1; pointer-events: all; }
.modal { background: var(--bg-secondary); border: 1px solid var(--border); border-radius: 8px; padding: 28px; max-width: 480px; width: 100%; transform: translateY(10px); transition: transform 0.2s; }
.modal-overlay.open .modal { transform: translateY(0); }
.modal h3 { font-family: 'Playfair Display', serif; font-size: 22px; color: #fff; margin-bottom: 16px; }
.modal-stars { display: flex; gap: 8px; margin-bottom: 20px; }
.modal-star { font-size: 32px; cursor: pointer; color: var(--star-empty); transition: color 0.1s, transform 0.1s; line-height: 1; }
.modal-star:hover { transform: scale(1.15); }
.modal-star.filled { color: var(--star-filled); }
.modal-star.hover-fill { color: var(--star-filled); }
.modal-actions { display: flex; gap: 10px; justify-content: flex-end; margin-top: 8px; }
.modal-cancel { background: none; border: 1px solid var(--border); color: var(--text-secondary); padding: 8px 16px; border-radius: 4px; font-family: inherit; font-size: 13px; cursor: pointer; }
.modal-cancel:hover { border-color: var(--text-muted); }

/* ─── LIST TILE GRID ─────────────────────────────────────── */
.list-tile-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 16px;
}

.list-tile {
  position: relative;
  border-radius: 4px;
  overflow: visible;
  transition: transform 0.2s;
  min-width: 0;
}
.list-tile:hover { transform: translateY(-3px); }

.list-tile-cover {
  width: 100%;
  padding-bottom: 150%;
  border-radius: 4px;
  overflow: hidden;
  background: var(--bg-card);
  position: relative;
}

.list-tile-cover-img {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.list-tile-placeholder {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, #1f2d3d, #152030);
  display: flex;
  align-items: center;
  justify-content: center;
}

.list-tile-num {
  font-family: 'Playfair Display', serif;
  font-size: 20px;
  font-weight: 700;
  color: var(--text-muted);
  opacity: 0.5;
}

.list-tile-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0,0,0,0.65);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity 0.2s;
  border-radius: 4px;
}
.list-tile:hover .list-tile-overlay { opacity: 1; }

.list-tile-info {
  padding: 6px 2px 0;
}

.list-tile-title {
  font-size: 12px;
  font-weight: 500;
  color: var(--text-primary);
  line-height: 1.3;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  margin-bottom: 2px;
}

.list-tile-author {
  font-size: 11px;
  color: var(--text-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* ─── REVIEWS ────────────────────────────────────────────── */
.reviews-heading {
  font-family: 'Playfair Display', serif;
  font-size: 20px;
  font-weight: 700;
  color: #fff;
  margin-bottom: 20px;
}

.review-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.review-item {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 20px;
}

.review-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
}

.review-avatar {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), #356a8c);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  font-weight: 700;
  color: #fff;
  flex-shrink: 0;
}

.review-meta { flex: 1; }
.review-name { font-size: 14px; font-weight: 600; color: var(--text-primary); margin-bottom: 2px; }
.review-stars { font-size: 13px; color: var(--star-filled); letter-spacing: 1px; }
.review-date { font-size: 12px; color: var(--text-muted); }
.review-text { font-size: 14px; color: var(--text-secondary); line-height: 1.7; }

/* ─── TAB CONTENT ────────────────────────────────────────── */
.tab-content { min-height: 100px; }

/* ─── DETAILS TAB ────────────────────────────────────────── */
.details-grid {
  display: flex;
  flex-direction: column;
  gap: 0;
  max-width: 600px;
}

.detail-row {
  display: flex;
  align-items: baseline;
  padding: 12px 0;
  border-bottom: 1px solid var(--border);
}

.detail-label {
  width: 140px;
  flex-shrink: 0;
  font-size: 13px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.detail-value {
  font-size: 14px;
  color: var(--text-primary);
}

.detail-value a {
  color: var(--accent);
  text-decoration: none;
}
.detail-value a:hover { text-decoration: underline; }

/* ─── GENRES TAB ─────────────────────────────────────────── */
.genre-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.genre-tag {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 6px 16px;
  font-size: 13px;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.15s;
}
.genre-tag:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: rgba(64,188,244,0.08);
}

/* ─── AUTH ────────────────────────────────────────────────── */
.header-auth { display: flex; align-items: center; gap: 8px; flex-shrink: 0; }

.auth-modal { position: relative; max-width: 400px; }

.auth-form { display: flex; flex-direction: column; gap: 10px; }

.auth-label {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin-bottom: -4px;
}

.auth-form input {
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 10px 14px;
  color: var(--text-primary);
  font-size: 14px;
  font-family: inherit;
  outline: none;
  transition: border-color 0.2s;
}
.auth-form input:focus { border-color: var(--accent); }
.auth-form input::placeholder { color: var(--text-muted); }

.auth-error {
  background: rgba(231,76,60,0.12);
  border: 1px solid rgba(231,76,60,0.3);
  border-radius: 4px;
  padding: 8px 12px;
  font-size: 13px;
  color: #e74c3c;
}

.auth-switch {
  text-align: center;
  font-size: 13px;
  color: var(--text-muted);
  margin-top: 8px;
}
.auth-switch a {
  color: var(--accent);
  text-decoration: none;
  font-weight: 600;
}
.auth-switch a:hover { text-decoration: underline; }

.modal-close-x {
  position: absolute;
  top: 12px;
  right: 16px;
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 20px;
  cursor: pointer;
  padding: 4px;
  line-height: 1;
  transition: color 0.15s;
}
.modal-close-x:hover { color: var(--text-primary); }

/* ─── CREATE LIST MODAL ──────────────────────────────────── */
.create-list-search-results {
  max-height: 180px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.create-list-search-item {
  padding: 8px 12px;
  border-radius: 4px;
  cursor: pointer;
  transition: background 0.15s;
}
.create-list-search-item:hover {
  background: var(--bg-hover);
}

.create-list-books {
  max-height: 240px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.create-list-book-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 12px;
  background: var(--bg-primary);
  border-radius: 4px;
  border: 1px solid var(--border);
}

.create-list-book-num {
  font-family: 'Playfair Display', serif;
  font-size: 14px;
  font-weight: 700;
  color: var(--text-muted);
  width: 24px;
  text-align: center;
  flex-shrink: 0;
}

.create-list-book-info {
  flex: 1;
  min-width: 0;
}

.create-list-book-title {
  font-size: 13px;
  font-weight: 500;
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.create-list-book-author {
  font-size: 12px;
  color: var(--text-muted);
}

.create-list-remove-btn {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 14px;
  padding: 4px 8px;
  border-radius: 4px;
  transition: color 0.15s, background 0.15s;
  flex-shrink: 0;
}
.create-list-remove-btn:hover {
  color: #e74c3c;
  background: rgba(231,76,60,0.1);
}

.lists-section-divider h3 {
  font-family: 'Playfair Display', serif;
}

/* ─── ADMIN COVER CONTROLS ───────────────────────────────── */
.admin-cover-actions {
  position: absolute;
  bottom: 8px;
  left: 4px;
  right: 4px;
  display: flex;
  gap: 4px;
  z-index: 5;
}
.admin-btn {
  font-size: 11px !important;
  padding: 4px 8px !important;
  background: rgba(20, 24, 28, 0.9) !important;
  border-color: var(--accent-orange) !important;
  color: var(--accent-orange) !important;
  backdrop-filter: blur(4px);
  flex: 1;
  text-align: center;
}
.admin-btn:hover {
  background: var(--accent-orange) !important;
  color: var(--bg-primary) !important;
}

/* ─── ADMIN COVER PICKER ────────────────────────────────── */
.admin-cover-picker {
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  z-index: 10;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px;
  margin-top: 6px;
  box-shadow: 0 8px 24px rgba(0,0,0,0.4);
  max-height: 360px;
  overflow-y: auto;
}
.cover-options-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(80px, 1fr));
  gap: 8px;
}
.cover-option {
  cursor: pointer;
  border: 2px solid transparent;
  border-radius: 6px;
  overflow: hidden;
  transition: border-color 0.15s, transform 0.15s;
  background: var(--bg-card);
}
.cover-option:hover {
  border-color: var(--accent);
  transform: scale(1.05);
}
.cover-option img {
  width: 100%;
  aspect-ratio: 2/3;
  object-fit: cover;
  display: block;
}
.cover-option-source {
  display: block;
  font-size: 9px;
  color: var(--text-muted);
  text-align: center;
  padding: 3px 2px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* ─── PROFILE LAYOUT ─────────────────────────────────────── */
.profile-layout { display: grid; grid-template-columns: 1fr 280px; gap: 32px; }
.profile-main { min-width: 0; }
.profile-sidebar { position: sticky; top: calc(var(--header-height) + 20px); align-self: start; }

/* ─── FRIENDS ────────────────────────────────────────────── */
.sidebar-section { background: var(--bg-secondary); border: 1px solid var(--border); border-radius: 10px; padding: 16px; }
.sidebar-heading { font-family: 'Playfair Display', serif; font-size: 15px; color: var(--text-primary); margin-bottom: 12px; }
.friend-search-wrap { position: relative; margin-bottom: 12px; }
.friend-search-wrap input { width: 100%; padding: 7px 10px; background: var(--bg-card); border: 1px solid var(--border); border-radius: 6px; color: var(--text-primary); font-size: 13px; font-family: inherit; }
.friend-search-wrap input:focus { border-color: var(--accent); outline: none; }
.friend-search-results { position: absolute; top: 100%; left: 0; right: 0; background: var(--bg-card); border: 1px solid var(--border); border-radius: 6px; margin-top: 4px; z-index: 10; display: none; max-height: 200px; overflow-y: auto; }
.friend-search-item { display: flex; align-items: center; gap: 8px; padding: 8px 10px; cursor: pointer; font-size: 13px; color: var(--text-primary); }
.friend-search-item:hover { background: var(--bg-hover); }
.friends-list { display: flex; flex-direction: column; gap: 8px; }
.friend-item { display: flex; align-items: flex-start; gap: 8px; padding: 8px 0; border-bottom: 1px solid var(--border); }
.friend-item:last-child { border-bottom: none; }
.friend-info { display: flex; gap: 8px; flex: 1; min-width: 0; }
.friend-avatar { width: 32px; height: 32px; border-radius: 50%; background: var(--accent); color: #fff; display: flex; align-items: center; justify-content: center; font-weight: 600; font-size: 14px; flex-shrink: 0; }
.friend-name { font-size: 13px; font-weight: 500; color: var(--text-primary); }
.friend-activity { margin-top: 2px; }
.friend-activity-item { display: block; font-size: 11px; color: var(--text-muted); line-height: 1.4; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; max-width: 180px; }
.friend-remove-btn { background: none; border: none; color: var(--text-muted); cursor: pointer; font-size: 12px; padding: 2px 4px; flex-shrink: 0; }
.friend-remove-btn:hover { color: #e74c3c; }

/* ─── EDITIONS ───────────────────────────────────────────── */
#book-editions-list { display: flex; flex-wrap: wrap; gap: 10px; padding-top: 10px; }
.edition-item { display: flex; gap: 10px; align-items: flex-start; background: var(--bg-card); border: 1px solid var(--border); border-radius: 8px; padding: 8px 10px; min-width: 160px; flex: 1 1 160px; max-width: 220px; }
.edition-cover { width: 36px; height: 52px; object-fit: cover; border-radius: 3px; flex-shrink: 0; }
.edition-cover-placeholder { width: 36px; height: 52px; background: var(--bg-secondary); border-radius: 3px; flex-shrink: 0; }
.edition-info { display: flex; flex-direction: column; gap: 3px; min-width: 0; }
.edition-publisher { font-size: 12px; font-weight: 500; color: var(--text-primary); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.edition-year { font-size: 11px; color: var(--text-muted); }
.edition-isbn { font-size: 10px; color: var(--text-muted); font-family: monospace; }

/* ─── COLLECTION / USER PROFILE READ LIST ────────────────── */
.collection-item { display: flex; align-items: center; gap: 14px; padding: 10px 0; border-bottom: 1px solid var(--border); cursor: pointer; }
.collection-item:last-child { border-bottom: none; }
.collection-item:hover { opacity: 0.85; }
.collection-item-cover { width: 40px; height: 58px; object-fit: cover; border-radius: 3px; flex-shrink: 0; background: var(--bg-secondary); }
.collection-item-info { flex: 1; min-width: 0; }
.collection-item-title { font-size: 14px; font-weight: 600; color: var(--text-primary); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.collection-item-author { font-size: 12px; color: var(--text-muted); margin-top: 2px; }
.collection-item-meta { font-size: 11px; color: var(--text-muted); margin-top: 3px; }
.collection-item-right { flex-shrink: 0; text-align: right; }
.collection-item-rating { color: var(--accent-orange); font-size: 13px; }
.collection-item-date { font-size: 11px; color: var(--text-muted); margin-top: 2px; }

/* ─── REVIEW FORM ────────────────────────────────────────── */
.write-review-form { background: var(--bg-secondary); border: 1px solid var(--border); border-radius: 8px; padding: 14px; margin-bottom: 16px; }
.write-review-form textarea { width: 100%; padding: 8px 10px; background: var(--bg-card); border: 1px solid var(--border); border-radius: 6px; color: var(--text-primary); font-size: 13px; font-family: inherit; resize: vertical; }
.write-review-form textarea:focus { border-color: var(--accent); outline: none; }
.review-form-stars { display: inline-flex; gap: 2px; margin-left: auto; }
.review-form-star { cursor: pointer; font-size: 18px; color: var(--star-empty); transition: color 0.15s; }
.review-form-star.hover-fill, .review-form-star:hover { color: var(--star-filled); }
.review-delete-btn { background: none; border: none; color: var(--text-muted); cursor: pointer; font-size: 12px; margin-left: auto; padding: 2px 6px; }
.review-delete-btn:hover { color: #e74c3c; }

/* ─── WISHLIST BUTTON ────────────────────────────────────── */
.detail-action-btn.active-wish { background: rgba(64,188,244,0.15); border-color: var(--accent); color: var(--accent); }

/* ─── WISHLIST TILE ─────────────────────────────────────── */
.wishlist-tile { transition: border-color 0.2s, transform 0.15s; }
.wishlist-tile:hover { border-color: var(--accent); transform: translateY(-1px); }
.wishlist-tile-icon { width: 36px; height: 36px; border-radius: 8px; background: rgba(64,188,244,0.12); display: flex; align-items: center; justify-content: center; font-size: 18px; flex-shrink: 0; }
.wishlist-remove-btn { background: none; border: none; color: var(--text-muted); cursor: pointer; font-size: 14px; padding: 4px 8px; border-radius: 4px; transition: color 0.15s, background 0.15s; flex-shrink: 0; }
.wishlist-remove-btn:hover { color: #e74c3c; background: rgba(231,76,60,0.1); }

/* ─── PROFILE AVATAR IMAGE ──────────────────────────────── */
.profile-big-avatar-img { width: 100%; height: 100%; border-radius: 50%; object-fit: cover; }
.header-avatar-img { width: 100%; height: 100%; border-radius: 50%; object-fit: cover; }
.review-avatar-img { width: 36px; height: 36px; border-radius: 50%; object-fit: cover; }
.friend-avatar-img { border-radius: 50%; object-fit: cover; }

/* ─── MOBILE ─────────────────────────────────────────────── */
.mobile-menu-btn { display: none; background: none; border: none; color: var(--text-primary); font-size: 24px; cursor: pointer; padding: 4px 8px; }
.mobile-only { display: none; }

@media (max-width: 768px) {
  .mobile-menu-btn { display: block; }
  .mobile-only { display: block !important; }
  nav { display: none; position: absolute; top: var(--header-height); left: 0; right: 0; background: var(--bg-secondary); border-bottom: 1px solid var(--border); flex-direction: column; padding: 12px 20px; z-index: 100; }
  nav.open { display: flex; }
  nav a { padding: 10px 0; font-size: 16px; }
  .header-search { display: none; }
  .profile-layout { grid-template-columns: 1fr; }
  .profile-sidebar { position: static; }
}

/* ─── SCROLLBAR ──────────────────────────────────────────── */
::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: var(--bg-primary); }
::-webkit-scrollbar-thumb { background: #2c3440; border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: #3a4555; }

/* ─── RESPONSIVE ─────────────────────────────────────────── */
@media (max-width: 768px) {
  .hero h1 { font-size: 28px; }
  .book-detail-inner { grid-template-columns: 160px 1fr; gap: 20px; }
  .favorites-grid { grid-template-columns: repeat(2, 1fr); }
  .lists-grid { grid-template-columns: 1fr; }
  .list-tile-grid { grid-template-columns: repeat(3, 1fr); }
  .shelf-arrow { display: none; }
}
@media (max-width: 520px) {
  .book-detail-inner { grid-template-columns: 1fr; }
  .list-tile-grid { grid-template-columns: repeat(2, 1fr); }
}