/* The Reading Room — landing hub for all book studies */
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  background: #0d1220;
  color: #f4efe2;
  font-family: 'Nunito', system-ui, sans-serif;
  overflow-x: hidden;
}
h1, h2 { font-family: 'Fraunces', serif; margin: 0; }

/* ---------- starfield ---------- */
.stars {
  position: fixed; inset: 0; z-index: 0; pointer-events: none;
  background: radial-gradient(1200px 700px at 20% -10%, #1b2547 0%, #0d1220 55%),
              radial-gradient(900px 600px at 100% 0%, #241a3d 0%, transparent 60%);
}
.star {
  position: absolute; border-radius: 50%; background: #f2e6c4;
  box-shadow: 0 0 6px 1px rgba(242, 230, 196, .8);
  animation: twinkle var(--d, 3s) ease-in-out var(--delay, 0s) infinite;
}
@keyframes twinkle { 0%, 100% { opacity: .15; } 50% { opacity: .9; } }

/* ---------- hero ---------- */
.hub-hero {
  position: relative; z-index: 1;
  padding: 120px 24px 96px;
  text-align: center;
  overflow: hidden;
  min-height: 560px;
  display: flex; align-items: center; justify-content: center;
}
.hero-bg {
  position: absolute; inset: 0; z-index: 0;
  background-size: cover; background-position: center 42%;
  transform: scale(1.02);
}
.hero-overlay {
  position: absolute; inset: 0; z-index: 0;
  background: linear-gradient(180deg, rgba(9,12,22,.12) 0%, rgba(10,13,26,.08) 45%, rgba(11,14,24,.55) 84%, #14182a 100%);
}
.hero-inner { position: relative; z-index: 1; max-width: 760px; margin: 0 auto; }
.hero-panel {
  display: inline-block;
  padding: 34px 44px 38px;
  border-radius: 32px;
  background: rgba(10, 13, 24, .42);
  backdrop-filter: blur(14px) saturate(1.2);
  -webkit-backdrop-filter: blur(14px) saturate(1.2);
  border: 1px solid rgba(255,255,255,.14);
  box-shadow: 0 20px 50px -20px rgba(0,0,0,.55);
}
.kicker {
  text-transform: uppercase; letter-spacing: .22em; font-size: .78rem;
  font-weight: 800; color: #ffd479; margin: 0 0 18px;
  text-shadow: 0 2px 10px rgba(0,0,0,.7);
}
.hub-hero h1 {
  font-size: clamp(2.6rem, 7vw, 4.6rem);
  font-weight: 900; line-height: 1.02;
  background: linear-gradient(180deg, #fff8e8 0%, #ffd479 55%, #ff9b6a 120%);
  -webkit-background-clip: text; background-clip: text; color: transparent;
  filter: drop-shadow(0 6px 18px rgba(0,0,0,.7));
}
.tagline {
  margin: 22px auto 0; max-width: 560px;
  font-size: 1.1rem; line-height: 1.6; color: #ffffff; font-weight: 700;
  text-shadow: 0 2px 10px rgba(0,0,0,.75);
}
.hero-fade {
  position: absolute; left: 0; right: 0; bottom: -1px; height: 90px; z-index: 1;
  background: linear-gradient(to bottom, transparent, #14182a);
}

/* ---------- shelf / cards ---------- */
.shelf {
  position: relative; z-index: 1;
  background: #14182a;
  padding: 10px 24px 70px;
}
.shelf-grid {
  max-width: 1180px; margin: 0 auto;
  display: grid; grid-template-columns: repeat(2, 1fr);
  gap: 28px;
}
@media (max-width: 860px) {
  .shelf-grid { grid-template-columns: 1fr; }
}

.book-card {
  position: relative;
  display: block;
  border-radius: 26px;
  overflow: hidden;
  height: 360px;
  text-decoration: none;
  color: #fff;
  box-shadow: 0 20px 45px -18px rgba(0,0,0,.65), 0 2px 10px rgba(0,0,0,.35);
  transform: translateY(0) scale(1);
  transition: transform .35s cubic-bezier(.2,.8,.2,1), box-shadow .35s;
  isolation: isolate;
}
.book-card:hover, .book-card:focus-visible {
  transform: translateY(-8px) scale(1.015);
  box-shadow: 0 28px 60px -16px rgba(0,0,0,.7), 0 4px 14px rgba(0,0,0,.4);
}
.card-bg {
  position: absolute; inset: 0;
  background-size: cover; background-position: center;
  transition: transform .6s ease;
}
.book-card:hover .card-bg { transform: scale(1.06); }
.card-tint {
  position: absolute; inset: 0;
  background: linear-gradient(180deg, rgba(10,10,15,.15) 0%, rgba(10,10,15,.55) 55%, rgba(10,10,15,.92) 100%);
}
.card-content {
  position: absolute; left: 0; right: 0; bottom: 0; padding: 26px 28px 28px;
  display: flex; flex-direction: column; gap: 6px;
}
.card-logo {
  width: 46px; height: 46px; object-fit: contain;
  filter: drop-shadow(0 3px 8px rgba(0,0,0,.6));
  margin-bottom: 4px;
}
.card-eyebrow {
  margin: 0; font-size: .78rem; font-weight: 800; letter-spacing: .1em;
  text-transform: uppercase; opacity: .85;
}
.book-card h2 {
  font-size: 1.9rem; font-weight: 800; line-height: 1.08; margin: 2px 0 4px;
}
.card-blurb {
  margin: 0; font-size: .96rem; line-height: 1.45; max-width: 46ch;
  color: rgba(255,255,255,.88); font-weight: 600;
}
.enter-btn {
  display: inline-flex; align-items: center; gap: 8px;
  margin-top: 14px; align-self: flex-start;
  background: rgba(255,255,255,.14);
  backdrop-filter: blur(6px);
  border: 1.5px solid rgba(255,255,255,.5);
  padding: 10px 18px; border-radius: 999px;
  font-weight: 800; font-size: .88rem;
  transition: background .2s, transform .2s;
}
.book-card:hover .enter-btn { background: rgba(255,255,255,.28); transform: translateX(3px); }

/* per-book accent glows on hover */
.book-card.wildrobot .enter-btn { color: #eaf6e6; }
.book-card.wildrobot:hover .card-tint { background: linear-gradient(180deg, rgba(22,41,29,.1) 0%, rgba(22,41,29,.55) 55%, rgba(22,41,29,.94) 100%); }
.book-card.boy:hover .card-tint { background: linear-gradient(180deg, rgba(59,36,21,.1) 0%, rgba(59,36,21,.6) 55%, rgba(43,26,15,.95) 100%); }
.book-card.oneivan:hover .card-tint { background: linear-gradient(180deg, rgba(30,20,16,.1) 0%, rgba(60,25,18,.6) 55%, rgba(32,15,12,.95) 100%); }
.book-card.wonder:hover .card-tint { background: linear-gradient(180deg, rgba(11,21,48,.1) 0%, rgba(18,32,61,.6) 55%, rgba(11,21,48,.95) 100%); }
.book-card.hatchet:hover .card-tint { background: linear-gradient(180deg, rgba(26,38,32,.1) 0%, rgba(26,38,32,.6) 55%, rgba(18,26,22,.95) 100%); }
.book-card.refugee:hover .card-tint { background: linear-gradient(180deg, rgba(27,36,54,.1) 0%, rgba(27,36,54,.6) 55%, rgba(18,25,38,.95) 100%); }
.book-card.justagirl:hover .card-tint { background: linear-gradient(180deg, rgba(28,39,64,.1) 0%, rgba(28,39,64,.6) 55%, rgba(18,24,40,.95) 100%); }
.book-card.longwalk:hover .card-tint { background: linear-gradient(180deg, rgba(36,26,18,.1) 0%, rgba(36,26,18,.6) 55%, rgba(24,17,12,.95) 100%); }

/* ---------- side arrow tabs (page-to-page nav) ---------- */
.page-nav {
  position: fixed; top: 50%; z-index: 60; transform: translateY(-50%);
  display: flex; flex-direction: column; align-items: center; gap: 10px;
  padding: 20px 11px; text-decoration: none; color: #fff;
  background: rgba(15, 19, 36, .68);
  backdrop-filter: blur(10px) saturate(1.3);
  -webkit-backdrop-filter: blur(10px) saturate(1.3);
  border: 1px solid rgba(255,255,255,.16);
  box-shadow: 0 12px 30px -12px rgba(0,0,0,.6);
  transition: background .2s, transform .2s;
}
.page-nav:hover { background: rgba(28, 35, 62, .88); }
.page-nav.next { right: 0; border-radius: 18px 0 0 18px; border-right: none; }
.page-nav.next:hover { transform: translateY(-50%) translateX(-4px); }
.page-nav.prev { left: 0; border-radius: 0 18px 18px 0; border-left: none; }
.page-nav.prev:hover { transform: translateY(-50%) translateX(4px); }
.page-nav-label {
  writing-mode: vertical-rl; text-orientation: mixed;
  font-weight: 800; letter-spacing: .1em; text-transform: uppercase; font-size: .76rem;
  color: #ffd479;
}
.page-nav-arrow { font-size: 1.3rem; line-height: 1; color: #fff; }

/* ---------- coming-soon cards ---------- */
.book-card.coming-soon { cursor: default; }
.book-card.coming-soon .card-bg { background-size: cover; background-position: center; }
.card-bg.placeholder-justagirl { background-image: linear-gradient(135deg, #7a5259 0%, #45303a 55%, #2a2030 100%); }
.card-bg.placeholder-longwalk { background-image: linear-gradient(135deg, #d59a4e 0%, #a06a30 55%, #4a3320 100%); }
.book-card.coming-soon .card-tint { background: linear-gradient(180deg, rgba(10,10,15,.25) 0%, rgba(10,10,15,.65) 55%, rgba(10,10,15,.95) 100%); }
.coming-badge {
  position: absolute; top: 20px; right: 20px; z-index: 2;
  background: rgba(0,0,0,.5); backdrop-filter: blur(4px);
  border: 1px solid rgba(255,255,255,.35);
  padding: 6px 15px; border-radius: 999px;
  font-size: .72rem; font-weight: 800; letter-spacing: .09em; text-transform: uppercase;
  color: #ffd479;
}

@media (max-width: 640px) {
  .page-nav { padding: 14px 8px; }
  .page-nav-label { font-size: .66rem; }
  .page-nav-arrow { font-size: 1.1rem; }
}

/* ---------- footer ---------- */
.hub-footer {
  position: relative; z-index: 1;
  background: #14182a;
  text-align: center;
  padding: 0 24px 46px;
  color: rgba(244,239,226,.55);
  font-size: .85rem;
  font-weight: 600;
}

@media (prefers-reduced-motion: reduce) {
  .star { animation: none; opacity: .5; }
  .book-card, .card-bg, .enter-btn { transition: none; }
}

/* ---------- vertical (up/down) page nav, for paging within a year group ---------- */
.page-nav-vert {
  position: fixed; left: 50%; transform: translateX(-50%); z-index: 60;
  display: flex; align-items: center; gap: 10px;
  padding: 14px 26px; text-decoration: none; color: #fff;
  background: rgba(15, 19, 36, .72);
  backdrop-filter: blur(10px) saturate(1.3);
  -webkit-backdrop-filter: blur(10px) saturate(1.3);
  border: 1px solid rgba(255,255,255,.18);
  box-shadow: 0 12px 30px -12px rgba(0,0,0,.6);
  border-radius: 999px;
  font-weight: 800; letter-spacing: .08em; text-transform: uppercase; font-size: .76rem;
  color: #ffd479;
  transition: background .2s, transform .2s;
}
.page-nav-vert span:last-child { color: #fff; }
.page-nav-vert:hover { background: rgba(28, 35, 62, .92); }
.page-nav-vert.down { bottom: 26px; }
.page-nav-vert.down:hover { transform: translateX(-50%) translateY(4px); }
.page-nav-vert.up { top: 26px; }
.page-nav-vert.up:hover { transform: translateX(-50%) translateY(-4px); }
.page-nav-vert .page-nav-arrow { font-size: 1.15rem; line-height: 1; }

@media (max-width: 640px) {
  .page-nav-vert { padding: 11px 18px; font-size: .66rem; gap: 8px; }
}

/* per-book accent glows on hover — new Years 5–6 stories */
.book-card.crenshaw:hover .card-tint { background: linear-gradient(180deg, rgba(58,20,40,.1) 0%, rgba(58,20,40,.6) 55%, rgba(35,14,26,.95) 100%); }
.book-card.bfg:hover .card-tint { background: linear-gradient(180deg, rgba(20,26,54,.1) 0%, rgba(20,26,54,.6) 55%, rgba(14,18,38,.95) 100%); }
.book-card.robotescapes:hover .card-tint { background: linear-gradient(180deg, rgba(58,38,14,.1) 0%, rgba(58,38,14,.6) 55%, rgba(38,24,10,.95) 100%); }
.book-card.goingsolo:hover .card-tint { background: linear-gradient(180deg, rgba(19,35,61,.1) 0%, rgba(19,35,61,.6) 55%, rgba(12,22,38,.95) 100%); }

.hero-bg.placeholder-years5-6-more {
  background-image:
    radial-gradient(60% 80% at 8% 15%, rgba(120,40,70,.55), transparent 60%),
    radial-gradient(60% 80% at 38% 10%, rgba(60,60,20,.5), transparent 60%),
    radial-gradient(60% 80% at 68% 20%, rgba(30,60,80,.5), transparent 60%),
    radial-gradient(60% 80% at 95% 15%, rgba(90,55,15,.55), transparent 60%),
    linear-gradient(180deg, #171b30 0%, #0d1220 100%);
}