/* ============================================================
   NEXT BEST AUDIO BOOK — style.css
   To retheme: update the :root variables below
   ============================================================ */

:root {
  --bg:           #0d0d0d;
  --bg-panel:     #181818;
  --text:         #f0f0f0;
  --text-muted:   #888;
  --accent:       #c8a84b;
  --cta-primary:  #ff6b35;
  --cover-w:      200px;
  --cover-h:      300px;
  --stage-h:      420px;
}

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

/* Ensure [hidden] always wins over display:grid/flex overrides */
[hidden] { display: none !important; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif;
  min-height: 100vh;
  overflow-x: hidden;
}

/* ---- Header ---- */
.site-header {
  text-align: center;
  padding: 2.5rem 1rem 0.8rem;
}

.site-title {
  font-size: clamp(1.5rem, 4vw, 2.6rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  background: linear-gradient(135deg, #fff 0%, var(--accent) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.site-tagline {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-top: 0.35rem;
}

/* ---- Tag Nav ---- */
.tag-nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.45rem;
  padding: 1.2rem 1rem 0.6rem;
}

.tag-btn {
  background: transparent;
  border: 1px solid #2e2e2e;
  color: var(--text-muted);
  border-radius: 999px;
  padding: 0.32rem 0.95rem;
  font-size: 0.78rem;
  cursor: pointer;
  transition: all 0.18s ease;
  white-space: nowrap;
}

.tag-btn:hover { border-color: #555; color: var(--text); }
.tag-btn.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #000;
  font-weight: 600;
}

/* ---- Cover Flow ---- */
.coverflow-section {
  position: relative;
  height: var(--stage-h);
  overflow: hidden;
  margin-top: 0.5rem;
  /* soft edge fade */
  -webkit-mask-image: linear-gradient(to right, transparent 0%, black 12%, black 88%, transparent 100%);
  mask-image: linear-gradient(to right, transparent 0%, black 12%, black 88%, transparent 100%);
}

.coverflow-stage {
  width: 100%;
  height: 100%;
  perspective: 1400px;
  perspective-origin: 50% 30%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.coverflow-track {
  position: relative;
  width: var(--cover-w);
  height: var(--cover-h);
  transform-style: preserve-3d;
}

.cover-item {
  position: absolute;
  top: 0;
  left: 0;
  width: var(--cover-w);
  height: var(--cover-h);
  cursor: pointer;
  transition:
    transform 0.42s cubic-bezier(0.25, 0.46, 0.45, 0.94),
    filter   0.42s ease,
    opacity  0.3s  ease;
  will-change: transform, filter;
  transform-origin: center center;
}


.cover-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  border-radius: 3px;
  box-shadow: 0 16px 60px rgba(0, 0, 0, 0.85);
  /* Reflection — webkit only; Firefox degrades gracefully */
  /* Gradient: visible at top of reflection, fades out downward — matches iTunes Cover Flow */
  -webkit-box-reflect: below 3px -webkit-linear-gradient(rgba(0, 0, 0, 0.35) 0%, transparent 75%);
}

/* ---- Arrows ---- */
.arrow-btn {
  position: absolute;
  top: 42%;
  transform: translateY(-50%);
  background: rgba(255, 255, 255, 0.07);
  border: 1px solid rgba(255, 255, 255, 0.1);
  color: rgba(255, 255, 255, 0.7);
  font-size: 2.4rem;
  line-height: 1;
  width: 44px;
  height: 60px;
  border-radius: 8px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s, color 0.2s;
  z-index: 20;
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  user-select: none;
}

.arrow-btn:hover { background: rgba(255,255,255,0.16); color: #fff; }
.arrow-prev { left: 10px; }
.arrow-next { right: 10px; }

/* ---- Spin zone ---- */
.spin-zone {
  display: flex;
  justify-content: center;
  padding: 1.6rem 1rem 0.5rem;
}

.spin-btn {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  background: linear-gradient(135deg, var(--accent) 0%, #a07830 100%);
  color: #000;
  border: none;
  border-radius: 999px;
  padding: 0.7rem 2.2rem;
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  letter-spacing: 0.04em;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
  box-shadow: 0 4px 22px rgba(200, 168, 75, 0.4);
}

.spin-btn:hover  { transform: scale(1.05); box-shadow: 0 6px 32px rgba(200, 168, 75, 0.65); }
.spin-btn:active { transform: scale(0.97); }
.spin-btn:disabled { opacity: 0.7; cursor: default; transform: none; }

.spin-btn.spinning { animation: spin-pulse 0.35s ease infinite alternate; }

@keyframes spin-pulse {
  from { box-shadow: 0 4px 22px rgba(200, 168, 75, 0.4); }
  to   { box-shadow: 0 4px 44px rgba(200, 168, 75, 0.95); }
}

.spin-icon { display: inline-block; font-size: 1.1rem; }
.spin-btn.spinning .spin-icon { animation: spin-rotate 0.25s linear infinite; }

@keyframes spin-rotate {
  from { transform: rotate(0deg); }
  to   { transform: rotate(360deg); }
}

/* ---- Book Details ---- */
.book-details {
  text-align: center;
  padding: 1.6rem 1.2rem 0.8rem;
  max-width: 580px;
  margin: 0 auto;
  min-height: 210px;
}

.book-title {
  font-size: clamp(1.3rem, 3vw, 1.9rem);
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 0.2rem;
}

.book-subtitle {
  font-size: 0.7em;
  font-weight: 400;
  color: #666;
  display: block;
  margin-top: 0.15rem;
}

.book-author {
  color: var(--text-muted);
  font-size: 0.95rem;
  margin-bottom: 0.55rem;
}

.book-meta {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 1.1rem;
  flex-wrap: wrap;
  font-size: 0.83rem;
  color: var(--text-muted);
  margin-bottom: 0.65rem;
}

.stars { color: var(--accent); letter-spacing: 0.05em; }

.book-narrator {
  font-size: 0.82rem;
  color: #666;
  margin-bottom: 0.9rem;
}

.book-review {
  font-size: 0.93rem;
  line-height: 1.68;
  color: #c0c0c0;
  margin-bottom: 0.95rem;
}

.badges {
  display: flex;
  justify-content: center;
  gap: 0.45rem;
  flex-wrap: wrap;
}

.badge {
  background: rgba(200, 168, 75, 0.12);
  border: 1px solid rgba(200, 168, 75, 0.35);
  color: var(--accent);
  font-size: 0.68rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  padding: 0.22rem 0.65rem;
  border-radius: 999px;
}

/* ---- CTA Zone ---- */
.cta-zone {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.65rem;
  padding: 0.8rem 1rem 0.6rem;
}

.cta-primary {
  display: inline-block;
  background: var(--cta-primary);
  color: #fff;
  text-decoration: none;
  border-radius: 8px;
  padding: 0.9rem 2.6rem;
  font-size: 1.05rem;
  font-weight: 700;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
  box-shadow: 0 4px 24px rgba(255, 107, 53, 0.45);
}

.cta-primary:hover { transform: translateY(-2px); box-shadow: 0 6px 34px rgba(255, 107, 53, 0.65); }

.cta-secondary {
  display: inline-block;
  background: transparent;
  color: var(--text-muted);
  text-decoration: none;
  border: 1px solid #2e2e2e;
  border-radius: 8px;
  padding: 0.65rem 1.8rem;
  font-size: 0.88rem;
  transition: border-color 0.2s, color 0.2s;
}

.cta-secondary:hover { border-color: #555; color: var(--text); }

.cta-amazon {
  font-size: 0.78rem;
  color: #555;
  text-decoration: none;
  transition: color 0.2s;
}

.cta-amazon:hover { color: var(--text-muted); }

.offer-note {
  font-size: 0.75rem;
  color: #555;
  margin-top: 0.1rem;
}

/* ---- Disclosure ---- */
.disclosure {
  text-align: center;
  font-size: 0.72rem;
  color: #444;
  padding: 0.8rem 1rem;
  max-width: 480px;
  margin: 0 auto;
  line-height: 1.5;
}

/* ---- Grid section ---- */
.grid-section {
  padding: 1rem 1rem 2.5rem;
  text-align: center;
}

.grid-toggle-btn {
  background: transparent;
  border: 1px solid #2e2e2e;
  color: var(--text-muted);
  border-radius: 8px;
  padding: 0.55rem 1.4rem;
  font-size: 0.82rem;
  cursor: pointer;
  transition: all 0.2s;
}

.grid-toggle-btn:hover { border-color: #555; color: var(--text); }

.book-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
  gap: 1rem;
  max-width: 860px;
  margin: 1.5rem auto 0;
}

.grid-book {
  cursor: pointer;
  text-align: center;
  transition: transform 0.2s;
}

.grid-book:hover { transform: scale(1.06); }
.grid-book:focus-visible { outline: 2px solid var(--accent); outline-offset: 4px; border-radius: 4px; }

.grid-book img {
  width: 100%;
  aspect-ratio: 2/3;
  object-fit: cover;
  border-radius: 4px;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.6);
  display: block;
}

.grid-book-title {
  font-size: 0.72rem;
  color: #666;
  margin-top: 0.4rem;
  line-height: 1.3;
}

/* ---- Footer ---- */
.freshness-note {
  text-align: center;
  font-size: 0.7rem;
  color: #383838;
  padding: 0.4rem 1rem;
}

.site-footer {
  text-align: center;
  padding: 1.4rem 1rem 2rem;
  font-size: 0.78rem;
  color: #383838;
  border-top: 1px solid #1a1a1a;
}

.site-footer a { color: #555; text-decoration: none; }
.site-footer a:hover { color: var(--text-muted); }

/* ---- Responsive ---- */
@media (max-width: 600px) {
  :root {
    --cover-w:  150px;
    --cover-h:  225px;
    --stage-h:  330px;
  }
  .arrow-prev { left: 4px; }
  .arrow-next { right: 4px; }
  .arrow-btn { width: 36px; height: 50px; font-size: 2rem; }
}

@media (max-width: 380px) {
  :root {
    --cover-w:  120px;
    --cover-h:  180px;
    --stage-h:  290px;
  }
}

/* ---- Focus styles ---- */
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }
button:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }