/* ============================================================
   koushikdeb.com — book page (extends paper.css)
   ============================================================ */

/* ---------- hero ---------- */
.bhero { padding: clamp(36px, 6vw, 70px) clamp(20px, 5vw, 40px) 10px; }
.bhero-inner {
  max-width: 1000px; margin: 0 auto;
  display: grid; grid-template-columns: 280px 1fr;
  gap: clamp(32px, 6vw, 70px); align-items: center;
}
.bhero-cover { perspective: 1400px; display: grid; place-items: center; }

.book3d {
  position: relative; width: 220px; height: 320px;
  transform-style: preserve-3d;
  transform: rotateY(-22deg) rotateX(5deg);
  animation: bookIntro 1.1s cubic-bezier(.2,.8,.3,1) both, bookSway 7s 1.1s ease-in-out infinite alternate;
}
@keyframes bookIntro {
  from { opacity: 0; transform: rotateY(-70deg) rotateX(12deg) translateX(-40px); }
  to   { opacity: 1; transform: rotateY(-22deg) rotateX(5deg); }
}
@keyframes bookSway {
  from { transform: rotateY(-26deg) rotateX(5deg) translateY(0); }
  to   { transform: rotateY(-12deg) rotateX(2deg) translateY(-12px); }
}
.book3d-cover {
  position: absolute; inset: 0;
  background:
    radial-gradient(120% 90% at 20% 0%, rgba(45,212,191,.22), transparent 55%),
    linear-gradient(155deg, #16264a 0%, #0d1730 55%, #1d2b52 100%);
  border: 1px solid rgba(251,191,36,.45);
  border-radius: 4px 14px 14px 4px;
  display: flex; flex-direction: column; justify-content: center; align-items: center;
  padding: 26px 20px; text-align: center; gap: 12px;
  box-shadow: 22px 30px 60px rgba(0,0,0,.6);
}
.bk-series {
  font-size: 10.5px; letter-spacing: 2px; text-transform: uppercase;
  color: var(--amber); font-weight: 700;
}
.bk-title {
  font-family: var(--font-display); font-size: 30px; font-weight: 700;
  line-height: 1.15; color: var(--text);
}
.bk-rule { width: 54px; height: 2px; background: linear-gradient(90deg, var(--teal), var(--amber)); }
.bk-author { font-size: 12.5px; color: var(--muted); letter-spacing: 1.4px; }
.book3d-spine {
  position: absolute; top: 2px; bottom: 2px; left: -16px; width: 16px;
  background: linear-gradient(90deg, #080e1e, #182647);
  transform: rotateY(-72deg); transform-origin: right;
  border-radius: 3px 0 0 3px;
}

.bhero-text h1 {
  font-family: var(--font-display); font-weight: 700;
  font-size: clamp(30px, 5.4vw, 50px); line-height: 1.12; letter-spacing: -1px;
  margin-top: 6px;
  animation: fadeUp .8s .15s both;
}
.bhero-text .grad {
  background: linear-gradient(100deg, var(--teal) 10%, #7ce8d8 45%, var(--amber) 95%);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.blede { color: var(--muted); margin-top: 16px; max-width: 520px; animation: fadeUp .8s .28s both; }

/* ---------- release + countdown ---------- */
.release-box {
  margin-top: 26px; padding: 20px 24px;
  background: linear-gradient(120deg, var(--teal-dim), var(--amber-dim));
  border: 1px solid rgba(45,212,191,.3); border-radius: var(--radius);
  animation: fadeUp .8s .4s both;
}
.release-label {
  display: block; font-size: 11.5px; letter-spacing: 2px; text-transform: uppercase;
  color: var(--teal); font-weight: 700;
}
.release-date {
  display: block; font-family: var(--font-display); font-size: 22px;
  font-weight: 700; color: var(--text); margin-top: 4px;
}
.countdown { display: flex; gap: 10px; margin-top: 16px; flex-wrap: wrap; }
.cd-unit {
  flex: 1; min-width: 62px; text-align: center;
  background: rgba(7,12,24,.55); border: 1px solid var(--card-border);
  border-radius: 12px; padding: 10px 6px;
}
.cd-num {
  display: block; font-family: var(--font-display); font-size: 25px; font-weight: 700;
  color: var(--text); font-variant-numeric: tabular-nums;
}
.cd-lbl { display: block; font-size: 10.5px; letter-spacing: 1.4px; text-transform: uppercase; color: var(--muted); }
.release-box.out { background: linear-gradient(120deg, rgba(34,197,94,.16), var(--teal-dim)); border-color: rgba(34,197,94,.4); }
.out-now {
  display: block; font-family: var(--font-display); font-size: 19px; font-weight: 700;
  color: #6ee7d8; margin-top: 12px;
}
.bhero-text .pcta { animation: fadeUp .8s .52s both; }

/* ---------- who it's for ---------- */
.who-list { list-style: none; margin: 22px 0 8px; }
.who-list li {
  display: flex; gap: 16px; align-items: flex-start;
  background: var(--card); border: 1px solid var(--card-border);
  border-radius: 14px; padding: 16px 20px; margin-bottom: 12px;
  color: var(--muted); font-size: 15.5px;
  transition: transform .3s, border-color .3s;
}
.who-list li:hover { transform: translateX(6px); border-color: rgba(45,212,191,.4); }
.who-list li > span { font-size: 24px; line-height: 1.2; flex-shrink: 0; }
.who-list strong { display: block; color: var(--text); margin-bottom: 2px; }

/* ---------- series rail ---------- */
.series-rail {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px; margin-top: 24px;
}
.series-card {
  position: relative; background: var(--card); border: 1px solid var(--card-border);
  border-radius: var(--radius); padding: 24px 22px;
  transition: transform .3s, border-color .3s, box-shadow .3s;
}
.series-card:hover { transform: translateY(-6px); border-color: rgba(45,212,191,.4); box-shadow: 0 18px 44px rgba(0,0,0,.4); }
.series-card.is-first { border-color: rgba(251,191,36,.45); }
.series-num {
  font-family: var(--font-display); font-size: 30px; font-weight: 700;
  color: rgba(255,255,255,.12); display: block; line-height: 1;
}
.series-card h3 { font-family: var(--font-display); font-size: 17.5px; margin: 8px 0 4px; }
.series-card p { color: var(--muted); font-size: 14px; margin-bottom: 12px; }
.series-tag {
  font-size: 11.5px; font-weight: 700; letter-spacing: 1.2px; text-transform: uppercase;
  color: var(--muted); background: rgba(255,255,255,.06);
  border: 1px solid var(--card-border); padding: 4px 12px; border-radius: 999px;
}
.series-tag.live { color: var(--amber); background: var(--amber-dim); border-color: rgba(251,191,36,.35); }

/* ---------- feedback ---------- */
.feedback {
  border-top: 1px solid var(--card-border);
  background: linear-gradient(180deg, rgba(255,255,255,.02), transparent 40%);
  padding: clamp(44px, 7vw, 80px) clamp(20px, 5vw, 40px) 60px;
}
.fb-inner { max-width: 760px; margin: 0 auto; }
.fb-title {
  font-family: var(--font-display); font-size: clamp(26px, 4vw, 36px); font-weight: 700;
  margin-bottom: 12px;
}
.fb-lede { color: var(--muted); margin-bottom: 30px; }

.fb-form {
  background: var(--card); border: 1px solid var(--card-border);
  border-radius: var(--radius); padding: clamp(20px, 3vw, 30px);
}
.fb-row { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.fb-field { display: block; margin-bottom: 18px; }
.fb-field > span {
  display: block; font-family: var(--font-display); font-size: 13.5px; font-weight: 600;
  color: var(--text); margin-bottom: 8px;
}
.fb-field em { color: var(--muted); font-style: normal; font-weight: 400; }
.fb-field input[type=text], .fb-field textarea {
  width: 100%; font-family: var(--font-body); font-size: 15px; color: var(--text);
  background: rgba(7,12,24,.6); border: 1px solid var(--card-border);
  border-radius: 12px; padding: 12px 14px; resize: vertical;
  transition: border-color .25s, box-shadow .25s;
}
.fb-field input:focus, .fb-field textarea:focus {
  outline: none; border-color: var(--teal); box-shadow: 0 0 0 3px rgba(45,212,191,.14);
}
.fb-field input::placeholder, .fb-field textarea::placeholder { color: #64748b; }
.fb-count { display: block; text-align: right; color: var(--muted); font-size: 12px; margin-top: 6px; }
.fb-hp { position: absolute; left: -9999px; width: 1px; height: 1px; opacity: 0; }

.stars { display: flex; align-items: center; gap: 4px; }
.star {
  background: none; border: none; cursor: pointer; padding: 2px 3px;
  font-size: 27px; line-height: 1; color: rgba(255,255,255,.18);
  transition: color .18s, transform .18s;
}
.star:hover, .star.on { color: var(--amber); transform: scale(1.12); }
.star-clear {
  background: none; border: none; cursor: pointer; color: var(--muted);
  font-size: 12px; margin-left: 6px; text-decoration: underline;
}

.fb-submit { border: none; cursor: pointer; font-size: 15px; }
.fb-submit:disabled { opacity: .55; cursor: progress; transform: none; }
.fb-status { margin-top: 14px; font-size: 14.5px; min-height: 1.2em; }
.fb-status.ok { color: #6ee7d8; }
.fb-status.err { color: #fca5a5; }

.fb-list-head {
  display: flex; align-items: baseline; justify-content: space-between;
  gap: 12px; margin: 44px 0 18px;
}
.fb-list-head h3 { font-family: var(--font-display); font-size: 20px; }
.fb-list-head span { color: var(--muted); font-size: 14px; }

.fb-list { display: flex; flex-direction: column; gap: 14px; }
.fb-item {
  background: var(--card); border: 1px solid var(--card-border);
  border-radius: 14px; padding: 18px 20px;
  animation: fbIn .5s ease both;
}
@keyframes fbIn { from { opacity: 0; transform: translateY(14px); } to { opacity: 1; transform: none; } }
.fb-item.fresh { border-color: rgba(45,212,191,.5); box-shadow: 0 0 26px rgba(45,212,191,.12); }
.fb-head { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; margin-bottom: 8px; }
.fb-avatar {
  width: 34px; height: 34px; border-radius: 10px; flex-shrink: 0;
  display: grid; place-items: center;
  font-family: var(--font-display); font-weight: 700; font-size: 14px; color: #04231e;
  background: linear-gradient(135deg, var(--teal), #6ee7d8);
}
.fb-name { font-family: var(--font-display); font-weight: 600; font-size: 15px; }
.fb-stars { color: var(--amber); font-size: 14px; letter-spacing: 1px; }
.fb-when { color: var(--muted); font-size: 12.5px; margin-left: auto; }
.fb-text { color: var(--muted); font-size: 15.5px; white-space: pre-wrap; overflow-wrap: anywhere; }
.fb-empty { color: var(--muted); text-align: center; padding: 26px; font-size: 15px; }

/* ---------- responsive ---------- */
@media (max-width: 820px) {
  .bhero-inner { grid-template-columns: 1fr; text-align: center; }
  .blede { margin-inline: auto; }
  .bhero-text .pcta { justify-content: center; }
  .stars { justify-content: center; }
  .fb-row { grid-template-columns: 1fr; gap: 0; }
}

@media (prefers-reduced-motion: reduce) {
  .book3d { animation: none; transform: rotateY(-18deg) rotateX(4deg); }
  .fb-item { animation: none; }
}

/* ---------- real cover image (replaces the CSS placeholder face) ---------- */
.book3d-cover--img {
  padding: 0; overflow: hidden; gap: 0;
  background: #1a0d10;                 /* matches the cover's dark header */
  border-color: rgba(255,255,255,.18);
}
.book3d-cover--img picture, .book3d-cover--img img {
  width: 100%; height: 100%; display: block; object-fit: cover;
}

/* ---------- subtitle ---------- */
.bsubtitle {
  font-family: var(--font-display); font-weight: 500;
  font-size: clamp(15px, 1.9vw, 18px); line-height: 1.45;
  color: var(--text); margin-top: 14px; max-width: 520px;
  animation: fadeUp .8s .22s both;
}

/* ---------- buy block ---------- */
.buy {
  margin-top: 26px; padding: 20px 22px;
  background: var(--card); border: 1px solid var(--card-border);
  border-radius: var(--radius);
  animation: fadeUp .8s .46s both;
}
.buy-label {
  display: block; font-family: var(--font-display); font-weight: 700;
  font-size: 15px; color: var(--text); margin-bottom: 12px;
}
.buy-row { display: flex; flex-wrap: wrap; gap: 10px; }
.btn-buy {
  display: inline-flex; align-items: center; gap: 8px;
  border: 1px solid var(--card-border); color: var(--text);
  background: rgba(255,255,255,.04); padding: 11px 18px;
}
.btn-buy:hover { border-color: var(--amber); color: var(--amber); }
.btn-buy.primary {
  background: linear-gradient(120deg, var(--amber), #fde68a); color: #1c1503;
  border-color: transparent; box-shadow: 0 8px 26px rgba(251,191,36,.3);
}
.btn-buy.primary:hover { color: #1c1503; box-shadow: 0 12px 34px rgba(251,191,36,.45); }
.buy-flag { font-size: 17px; line-height: 1; }
.buy-note { display: block; color: var(--muted); font-size: 12.5px; margin-top: 10px; }
.bhero-text .pcta { margin-top: 18px; }

@media (max-width: 820px) {
  .bsubtitle { margin-inline: auto; }
  .buy { text-align: left; }
  .buy-row .btn-buy { flex: 1 1 100%; justify-content: center; }
}

/* ---------- format toggle + Kindle Unlimited badge ---------- */
.fmt { display: flex; gap: 8px; margin-bottom: 10px; flex-wrap: wrap; }
.fmt-btn {
  display: flex; flex-direction: column; align-items: flex-start; gap: 1px;
  background: rgba(7,12,24,.55); border: 1px solid var(--card-border);
  border-radius: 12px; padding: 9px 16px; cursor: pointer; color: var(--muted);
  font-family: var(--font-body); text-align: left; min-width: 130px;
  transition: border-color .2s, color .2s, background .2s;
}
.fmt-btn:hover { border-color: rgba(251,191,36,.5); color: var(--text); }
.fmt-btn.on { border-color: var(--amber); background: var(--amber-dim); color: var(--text); }
.fmt-name { font-family: var(--font-display); font-weight: 600; font-size: 14px; }
.fmt-price { font-size: 13px; color: var(--amber); font-weight: 600; }
.ku-badge {
  display: inline-block; font-size: 12.5px; color: var(--muted);
  background: rgba(255,255,255,.05); border: 1px solid var(--card-border);
  padding: 4px 12px; border-radius: 999px; margin-bottom: 14px;
}
.ku-badge strong { color: var(--text); }
.ku-badge[hidden] { display: none; }

@media (max-width: 820px) {
  .fmt-btn { flex: 1; }
}

/* ---------- "read a free sample" strip on the book page ---------- */
.sample-cta {
  display: flex; align-items: center; gap: 14px;
  margin-top: 20px; padding: 12px 16px 12px 12px;
  background: var(--teal-dim); border: 1px solid rgba(45,212,191,.35);
  border-radius: 14px; color: var(--text); max-width: 520px;
  transition: transform .25s, border-color .25s, box-shadow .25s;
  animation: fadeUp .8s .34s both;
}
.sample-cta:hover { transform: translateY(-3px); border-color: var(--teal); box-shadow: 0 12px 30px rgba(45,212,191,.18); }
.sample-cta img { width: 44px; height: auto; border-radius: 3px; box-shadow: 0 4px 12px rgba(0,0,0,.4); flex-shrink: 0; }
.sample-cta-text { display: flex; flex-direction: column; gap: 2px; flex: 1; min-width: 0; }
.sample-cta-text strong { font-family: var(--font-display); font-size: 15.5px; color: var(--teal); }
.sample-cta-text span { font-size: 13px; color: var(--muted); }
.sample-cta-arrow { font-family: var(--font-display); font-size: 22px; color: var(--teal); flex-shrink: 0; }
@media (max-width: 820px) { .sample-cta { margin-inline: auto; text-align: left; } }

/* "More stores" expander */
.btn-more { color: var(--muted); }
.btn-more.open, .btn-more:hover { color: var(--teal); border-color: var(--teal); }
.more-caret { display: inline-block; transition: transform .2s; margin-left: 2px; }
.btn-more.open .more-caret { transform: rotate(180deg); }
.buy-row-more { margin-top: 10px; padding-top: 10px; border-top: 1px dashed var(--card-border); }
.buy-row-more[hidden] { display: none; }

/* ---------- release sentence (self-contained for search snippets) ---------- */
.release-line { font-family: var(--font-display); font-size: 17px; line-height: 1.4; color: var(--text); margin-top: 6px; }
.release-line strong { color: var(--text); }
.release-line time { color: var(--amber); font-weight: 700; white-space: nowrap; }
.release-sub { color: var(--muted); font-size: 13.5px; line-height: 1.5; margin-top: 6px; }

/* ---------- FAQ ---------- */
.faq { margin: 18px 0 8px; }
.faq-item {
  background: var(--card); border: 1px solid var(--card-border); border-radius: 14px;
  padding: 16px 20px; margin-bottom: 10px; transition: border-color .25s;
}
.faq-item:hover { border-color: rgba(45,212,191,.35); }
.faq-item dt { font-family: var(--font-display); font-weight: 600; font-size: 16px; color: var(--text); margin-bottom: 6px; }
.faq-item dd { color: var(--muted); font-size: 15px; line-height: 1.65; margin: 0; }

/* ---------- author card ---------- */
.author-card {
  display: flex; gap: 20px; align-items: flex-start;
  background: var(--card); border: 1px solid var(--card-border); border-radius: var(--radius);
  padding: 22px 24px; margin-top: 18px;
}
.author-card img { width: 96px; height: 96px; border-radius: 16px; object-fit: cover; flex-shrink: 0; box-shadow: 0 8px 24px rgba(0,0,0,.4); }
.author-card h3 { font-family: var(--font-display); font-size: 19px; margin-bottom: 6px; }
.author-card p { color: var(--muted); font-size: 15px; margin-bottom: 8px; }
.author-links { font-size: 14px; }
@media (max-width: 640px) { .author-card { flex-direction: column; align-items: center; text-align: center; } }