/* ═══════════════════════════════════════════════════════════
   BOOKS PAGE — books.css
   Junior Ceranor Nelson
═══════════════════════════════════════════════════════════ */

/* ─── ACTIVE NAV LINK ─────────────────────────────────── */
.nav-link--active {
  color: var(--gold) !important;
  font-weight: 600;
}

/* ─── HERO ────────────────────────────────────────────── */
.bk-hero {
  position: relative;
  background: var(--navy);
  padding: 148px 0 90px;
  overflow: hidden;
  text-align: center;
}

.bk-hero-bg {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(135deg, #0b1d3a 0%, #112248 35%, #1a3464 55%, #b8902a 85%, #c9a84c 100%),
    radial-gradient(ellipse at 15% 60%, rgba(201,168,76,0.18) 0%, transparent 55%),
    radial-gradient(ellipse at 85% 15%, rgba(201,168,76,0.12) 0%, transparent 50%),
    radial-gradient(ellipse at 50% 100%, rgba(11,29,58,0.85) 0%, transparent 60%);
  pointer-events: none;
}

.bk-hero-particles {
  position: absolute;
  inset: 0;
  pointer-events: none;
  overflow: hidden;
}

.bk-hero-particle {
  position: absolute;
  border-radius: 50%;
  background: rgba(201,168,76,0.15);
  animation: bk-float linear infinite;
}
.bk-hero-particle:nth-child(1)  { width:4px;  height:4px;  left:10%;  top:20%; animation-duration:8s;  animation-delay:0s; }
.bk-hero-particle:nth-child(2)  { width:6px;  height:6px;  left:25%;  top:60%; animation-duration:11s; animation-delay:1s; }
.bk-hero-particle:nth-child(3)  { width:3px;  height:3px;  left:45%;  top:30%; animation-duration:9s;  animation-delay:2s; }
.bk-hero-particle:nth-child(4)  { width:5px;  height:5px;  left:70%;  top:70%; animation-duration:13s; animation-delay:0.5s; }
.bk-hero-particle:nth-child(5)  { width:4px;  height:4px;  left:85%;  top:40%; animation-duration:10s; animation-delay:3s; }
.bk-hero-particle:nth-child(6)  { width:7px;  height:7px;  left:60%;  top:15%; animation-duration:14s; animation-delay:1.5s; }

@keyframes bk-float {
  0%   { transform: translateY(0) rotate(0deg); opacity: 0.6; }
  50%  { opacity: 1; }
  100% { transform: translateY(-30px) rotate(180deg); opacity: 0.4; }
}

.bk-hero-noise {
  position: absolute;
  inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.03'/%3E%3C/svg%3E");
  opacity: 0.5;
  pointer-events: none;
}

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

.bk-hero-icon {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: rgba(201,168,76,0.12);
  border: 1px solid rgba(201,168,76,0.35);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 22px;
  opacity: 0;
  animation: bk-fade-up 0.65s ease 0.2s forwards;
}

.bk-hero-icon svg {
  width: 26px;
  height: 26px;
  fill: none;
  stroke: var(--gold);
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.bk-hero-label {
  font-family: 'Montserrat', sans-serif;
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.34em;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: 16px;
  opacity: 0;
  animation: bk-fade-up 0.65s ease 0.35s forwards;
}

.bk-hero-title {
  font-family: 'Montserrat', sans-serif;
  font-size: clamp(2.6rem, 6vw, 4.2rem);
  font-weight: 900;
  letter-spacing: -0.03em;
  color: #ffffff;
  margin-bottom: 18px;
  line-height: 1.05;
  opacity: 0;
  animation: bk-fade-up 0.65s ease 0.5s forwards;
}

.bk-hero-title span {
  background: linear-gradient(90deg, #c9a84c, #e8c97a, #c9a84c);
  background-clip: text;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-size: 200% auto;
  animation: bk-shimmer 3s linear infinite;
}

@keyframes bk-shimmer {
  0%   { background-position: 0% center; }
  100% { background-position: 200% center; }
}

.bk-hero-sub {
  font-family: 'Inter', sans-serif;
  font-size: 1.05rem;
  font-weight: 300;
  color: rgba(255,255,255,0.65);
  max-width: 560px;
  margin: 0 auto 0;
  line-height: 1.6;
  opacity: 0;
  animation: bk-fade-up 0.65s ease 0.65s forwards;
}

.bk-hero-line {
  width: 48px;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--gold), transparent);
  margin: 30px auto 0;
  opacity: 0;
  animation: bk-fade-up 0.65s ease 0.8s forwards;
}

@keyframes bk-fade-up {
  from { opacity: 0; transform: translateY(18px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ─── BOOKS SECTION ───────────────────────────────────── */
.bk-section {
  padding: 80px 0 100px;
  background: var(--light, #f7f5f0);
  position: relative;
}

.bk-section::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--navy), var(--gold), var(--navy));
}

.bk-section-header {
  text-align: center;
  margin-bottom: 60px;
}

.bk-section-label {
  font-family: 'Montserrat', sans-serif;
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: 12px;
}

.bk-section-title {
  font-family: 'Montserrat', sans-serif;
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  font-weight: 800;
  color: var(--navy);
  letter-spacing: -0.02em;
  margin-bottom: 14px;
}

.bk-section-desc {
  font-family: 'Inter', sans-serif;
  font-size: 1rem;
  color: var(--muted, #5a5a5a);
  max-width: 540px;
  margin: 0 auto;
  line-height: 1.65;
}

/* ─── BOOK CARDS ──────────────────────────────────────── */
.bk-list {
  display: flex;
  flex-direction: column;
  gap: 52px;
  max-width: 940px;
  margin: 0 auto;
}

.bk-card {
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: 50px;
  background: #ffffff;
  border-radius: 4px;
  overflow: hidden;
  box-shadow: 0 8px 40px rgba(11,29,58,0.10), 0 2px 8px rgba(11,29,58,0.06);
  transition: transform 0.35s ease, box-shadow 0.35s ease;
  opacity: 0;
  transform: translateY(24px);
}

.bk-card.revealed {
  opacity: 1;
  transform: translateY(0);
  transition: opacity 0.6s ease, transform 0.6s ease, box-shadow 0.35s ease;
}

.bk-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 18px 56px rgba(11,29,58,0.14), 0 4px 16px rgba(11,29,58,0.08);
}

/* Cover area */
.bk-cover-wrap {
  position: relative;
  background: linear-gradient(135deg, #0b1d3a 0%, #1a3464 50%, #2a4a7c 100%);
  overflow: hidden;
  min-height: 360px;
  display: flex;
  align-items: stretch;
}

.bk-cover-wrap::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 60%, rgba(11,29,58,0.4) 100%);
  pointer-events: none;
}

.bk-cover-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: top center;
  display: block;
  transition: transform 0.4s ease;
}

.bk-card:hover .bk-cover-img {
  transform: scale(1.03);
}

.bk-cover-placeholder {
  width: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 40px 24px;
  min-height: 360px;
  gap: 16px;
}

.bk-cover-placeholder svg {
  width: 56px;
  height: 56px;
  fill: none;
  stroke: rgba(201,168,76,0.5);
  stroke-width: 1.3;
}

.bk-cover-placeholder span {
  font-family: 'Montserrat', sans-serif;
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: rgba(201,168,76,0.5);
}

/* Info area */
.bk-info {
  padding: 40px 44px 40px 0;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 0;
}

.bk-genre {
  font-family: 'Montserrat', sans-serif;
  font-size: 0.63rem;
  font-weight: 700;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: 12px;
}

.bk-title {
  font-family: 'Montserrat', sans-serif;
  font-size: clamp(1.4rem, 2.5vw, 1.9rem);
  font-weight: 900;
  color: var(--navy);
  letter-spacing: -0.02em;
  line-height: 1.15;
  margin-bottom: 8px;
}

.bk-subtitle {
  font-family: 'Inter', sans-serif;
  font-size: 1rem;
  font-weight: 400;
  color: var(--muted, #5a5a5a);
  margin-bottom: 8px;
  font-style: italic;
}

.bk-year {
  font-family: 'Montserrat', sans-serif;
  font-size: 0.75rem;
  font-weight: 600;
  color: rgba(11,29,58,0.45);
  margin-bottom: 20px;
  letter-spacing: 0.06em;
}

.bk-divider {
  width: 40px;
  height: 2px;
  background: var(--gold);
  border-radius: 1px;
  margin-bottom: 20px;
}

.bk-desc {
  font-family: 'Inter', sans-serif;
  font-size: 0.94rem;
  line-height: 1.72;
  color: var(--muted, #5a5a5a);
  margin-bottom: 32px;
  flex: 1;
}

/* Buy links */
.bk-buy-label {
  font-family: 'Montserrat', sans-serif;
  font-size: 0.62rem;
  font-weight: 700;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--navy);
  margin-bottom: 12px;
  opacity: 0.6;
}

.bk-buy-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.bk-buy-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 16px;
  background: var(--navy);
  color: #ffffff;
  border-radius: 3px;
  font-family: 'Montserrat', sans-serif;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-decoration: none;
  transition: background 0.2s ease, transform 0.15s ease, box-shadow 0.2s ease;
  box-shadow: 0 2px 8px rgba(11,29,58,0.15);
}

.bk-buy-btn:hover {
  background: #16325c;
  transform: translateY(-1px);
  box-shadow: 0 4px 14px rgba(11,29,58,0.22);
}

.bk-buy-btn img {
  width: 16px;
  height: 16px;
  border-radius: 2px;
  flex-shrink: 0;
  object-fit: contain;
}

.bk-buy-btn--amazon  { background: #131921; }
.bk-buy-btn--amazon:hover  { background: #232f3e; }
.bk-buy-btn--bn      { background: #00371a; }
.bk-buy-btn--bn:hover      { background: #004d25; }
.bk-buy-btn--apple   { background: #1c1c1e; }
.bk-buy-btn--apple:hover   { background: #2c2c2e; }
.bk-buy-btn--google  { background: #4285F4; }
.bk-buy-btn--google:hover  { background: #3367d6; }
.bk-buy-btn--kobo    { background: #1c3f5c; }
.bk-buy-btn--kobo:hover    { background: #254f72; }
.bk-buy-btn--bookshop { background: #2d4a22; }
.bk-buy-btn--bookshop:hover { background: #3a5e2c; }

/* ─── EMPTY / LOADING STATES ──────────────────────────── */
.bk-spinner {
  display: flex;
  justify-content: center;
  padding: 80px 0;
}

.bk-spinner-ring {
  width: 44px;
  height: 44px;
  border: 3px solid #e2ddd0;
  border-top-color: var(--gold);
  border-radius: 50%;
  animation: bk-spin 0.8s linear infinite;
}

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

.bk-empty {
  text-align: center;
  padding: 80px 20px;
  font-family: 'Montserrat', sans-serif;
  font-size: 0.9rem;
  color: var(--muted, #5a5a5a);
  letter-spacing: 0.04em;
}

/* ─── CTA SECTION ─────────────────────────────────────── */
.bk-cta-section {
  background: linear-gradient(135deg, #0b1d3a 0%, #122654 50%, #0e254a 100%);
  padding: 80px 0;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.bk-cta-section::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at 50% 0%, rgba(201,168,76,0.12) 0%, transparent 60%);
  pointer-events: none;
}

.bk-cta-inner {
  position: relative;
  z-index: 1;
  max-width: 600px;
  margin: 0 auto;
}

.bk-cta-label {
  font-family: 'Montserrat', sans-serif;
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: 16px;
}

.bk-cta-title {
  font-family: 'Montserrat', sans-serif;
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 800;
  color: #ffffff;
  letter-spacing: -0.02em;
  margin-bottom: 14px;
  line-height: 1.2;
}

.bk-cta-sub {
  font-family: 'Inter', sans-serif;
  font-size: 0.95rem;
  color: rgba(255,255,255,0.55);
  margin-bottom: 30px;
  line-height: 1.6;
}

.bk-cta-btn {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 14px 30px;
  background: var(--gold);
  color: var(--navy);
  border-radius: 3px;
  font-family: 'Montserrat', sans-serif;
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  text-decoration: none;
  transition: background 0.2s ease, transform 0.15s ease;
}

.bk-cta-btn:hover {
  background: #e8c97a;
  transform: translateY(-2px);
}

/* ─── DARK MODE ───────────────────────────────────────── */
body.dark-mode .bk-section {
  background: #111827;
}

body.dark-mode .bk-section::before {
  background: linear-gradient(90deg, #c9a84c, #e8c97a, #c9a84c);
}

body.dark-mode .bk-card {
  background: #1a2535;
  box-shadow: 0 8px 40px rgba(0,0,0,0.3);
}

body.dark-mode .bk-title {
  color: #e8e0d0;
}

body.dark-mode .bk-year {
  color: rgba(232,224,208,0.45);
}

body.dark-mode .bk-desc {
  color: #9ca3af;
}

body.dark-mode .bk-buy-label {
  color: #e8e0d0;
}

body.dark-mode .bk-section-title {
  color: #e8e0d0;
}

body.dark-mode .bk-section-desc {
  color: #9ca3af;
}

/* ─── RESPONSIVE ──────────────────────────────────────── */
@media (max-width: 860px) {
  .bk-card {
    grid-template-columns: 220px 1fr;
    gap: 32px;
  }

  .bk-info {
    padding: 32px 28px 32px 0;
  }
}

@media (max-width: 680px) {
  .bk-hero {
    padding: 120px 0 70px;
  }

  .bk-card {
    grid-template-columns: 1fr;
    gap: 0;
  }

  .bk-cover-wrap {
    min-height: 280px;
  }

  .bk-info {
    padding: 28px 24px 32px;
  }

  .bk-buy-links {
    gap: 8px;
  }

  .bk-list {
    gap: 36px;
  }
}