/* Digital Library — styles */
:root {
  --font-display: 'Fraunces', Georgia, 'Times New Roman', serif;
  --font-body: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
  --radius: 18px;
  --radius-sm: 12px;
  --ease: cubic-bezier(.2, .8, .2, 1);
  --wrap: 1240px;
}

[data-theme='dark'] {
  --bg: #0d0e1a;
  --bg-2: #14152a;
  --surface: #191b33;
  --surface-2: #22244200;
  --line: rgba(255, 255, 255, .08);
  --text: #eeedf7;
  --muted: #a3a2bd;
  --accent: #f6a723;
  --accent-2: #ef6b2f;
  --accent-soft: rgba(246, 167, 35, .14);
  --shadow: 0 18px 40px -18px rgba(0, 0, 0, .7);
  --hero-glow: radial-gradient(1000px 420px at 15% -10%, rgba(239, 107, 47, .30), transparent 60%),
               radial-gradient(800px 380px at 90% 0%, rgba(124, 92, 255, .25), transparent 60%);
  --reader-bg: #0a0b14;
  color-scheme: dark;
}

[data-theme='light'] {
  --bg: #faf6ef;
  --bg-2: #f3ece0;
  --surface: #ffffff;
  --line: rgba(40, 28, 10, .10);
  --text: #221b2e;
  --muted: #6c6478;
  --accent: #d9771a;
  --accent-2: #c2410c;
  --accent-soft: rgba(217, 119, 26, .12);
  --shadow: 0 18px 36px -20px rgba(70, 40, 10, .35);
  --hero-glow: radial-gradient(1000px 420px at 15% -10%, rgba(246, 167, 35, .30), transparent 60%),
               radial-gradient(800px 380px at 90% 0%, rgba(194, 65, 12, .14), transparent 60%);
  --reader-bg: #e9e3d8;
  color-scheme: light;
}

*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; }
body {
  background: var(--bg);
  color: var(--text);
  font: 400 16px/1.55 var(--font-body);
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  transition: background .3s, color .3s;
}
a { color: inherit; text-decoration: none; }
svg { width: 20px; height: 20px; fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; flex: none; }
.wrap { width: 100%; max-width: var(--wrap); margin: 0 auto; padding: 0 24px; }

/* ---------- top bar ---------- */
.topbar {
  position: sticky; top: 0; z-index: 20;
  background: color-mix(in srgb, var(--bg) 78%, transparent);
  backdrop-filter: saturate(160%) blur(14px);
  -webkit-backdrop-filter: saturate(160%) blur(14px);
  border-bottom: 1px solid var(--line);
}
.topbar-inner { display: flex; align-items: center; gap: 16px; height: 68px; }
.brand { display: flex; align-items: center; gap: 10px; font: 700 20px/1 var(--font-display); letter-spacing: -.01em; white-space: nowrap; }
.brand-mark {
  display: grid; place-items: center; width: 36px; height: 36px; border-radius: 11px; color: #fff;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  box-shadow: 0 8px 18px -8px var(--accent-2);
}
.brand-mark svg { width: 19px; height: 19px; }
.search {
  margin-left: auto; position: relative; display: flex; align-items: center;
  width: min(420px, 100%);
}
.search svg { position: absolute; left: 14px; color: var(--muted); width: 18px; height: 18px; pointer-events: none; }
.search input {
  width: 100%; height: 42px; padding: 0 16px 0 42px; border-radius: 999px;
  border: 1px solid var(--line); background: var(--surface); color: var(--text);
  font: inherit; font-size: 15px; outline: none; transition: border-color .2s, box-shadow .2s;
}
.search input:focus { border-color: var(--accent); box-shadow: 0 0 0 4px var(--accent-soft); }

.icon-btn {
  display: inline-grid; place-items: center; width: 40px; height: 40px; border-radius: 12px;
  border: 1px solid var(--line); background: var(--surface); color: var(--text);
  cursor: pointer; transition: transform .15s var(--ease), border-color .2s, background .2s; flex: none;
}
.icon-btn:hover { border-color: var(--accent); color: var(--accent); }
.icon-btn:active { transform: scale(.94); }
[data-theme='dark'] .i-moon, [data-theme='light'] .i-sun { display: none; }

/* ---------- hero ---------- */
.hero { position: relative; padding: 72px 0 40px; background: var(--hero-glow); overflow: hidden; }
.eyebrow { margin: 0 0 12px; color: var(--accent); font-weight: 600; letter-spacing: .14em; text-transform: uppercase; font-size: 12.5px; }
.hero h1 { margin: 0; font: 700 clamp(38px, 6vw, 68px)/1.02 var(--font-display); letter-spacing: -.025em; }
.lead { max-width: 560px; margin: 18px 0 0; color: var(--muted); font-size: 18px; }
.stats { display: flex; gap: 14px; margin-top: 30px; flex-wrap: wrap; }
.stats div {
  display: flex; align-items: baseline; gap: 8px; padding: 12px 18px; border-radius: 14px;
  background: var(--surface); border: 1px solid var(--line);
}
.stats strong { font: 700 24px/1 var(--font-display); color: var(--accent); }
.stats span { color: var(--muted); font-size: 14px; }

/* ---------- content ---------- */
.content { padding-top: 34px; padding-bottom: 64px; flex: 1; }
.crumbs { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; color: var(--muted); font-size: 14px; margin-bottom: 14px; }
.crumbs a:hover { color: var(--accent); }
.crumbs strong { color: var(--text); font-weight: 600; }
.section-head { display: flex; align-items: center; gap: 14px; margin-bottom: 24px; flex-wrap: wrap; }
.section-head h2 { margin: 0; font: 700 clamp(26px, 3.4vw, 38px)/1.1 var(--font-display); letter-spacing: -.02em; }
.badge { padding: 5px 12px; border-radius: 999px; background: var(--accent-soft); color: var(--accent); font-weight: 600; font-size: 13px; }
.sub-head { margin: 34px 0 16px; font-size: 13px; letter-spacing: .12em; text-transform: uppercase; color: var(--muted); font-weight: 600; }
.sub-head:first-of-type { margin-top: 0; }

.grid { display: grid; gap: 26px; }
.grid.books { grid-template-columns: repeat(auto-fill, minmax(170px, 1fr)); }
.grid.folders { grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); }
.grid.folders.large { grid-template-columns: repeat(auto-fill, minmax(290px, 1fr)); }

.card {
  display: flex; flex-direction: column; border-radius: var(--radius);
  background: var(--surface); border: 1px solid var(--line);
  transition: transform .35s var(--ease), box-shadow .35s var(--ease), border-color .25s;
  overflow: hidden; animation: rise .5s var(--ease) both;
}
.card:hover { transform: translateY(-6px); box-shadow: var(--shadow); border-color: color-mix(in srgb, var(--accent) 45%, transparent); }
.card-body { padding: 14px 16px 16px; }
.card h3 { margin: 0; font-size: 15.5px; font-weight: 600; line-height: 1.35; }
.meta { display: flex; align-items: center; gap: 6px; margin: 6px 0 0; color: var(--muted); font-size: 13px; }
.meta svg { width: 15px; height: 15px; }
.card-folder { display: block; font-size: 12px; color: var(--accent); margin-bottom: 4px; font-weight: 500; }

@keyframes rise { from { opacity: 0; transform: translateY(12px); } }
.grid > .card:nth-child(2) { animation-delay: .04s; }
.grid > .card:nth-child(3) { animation-delay: .08s; }
.grid > .card:nth-child(4) { animation-delay: .12s; }
.grid > .card:nth-child(5) { animation-delay: .16s; }
.grid > .card:nth-child(n+6) { animation-delay: .2s; }

/* book cover */
.cover { position: relative; aspect-ratio: 2 / 3; background: var(--bg-2); overflow: hidden; }
.cover img { width: 100%; height: 100%; object-fit: cover; display: block; transition: transform .6s var(--ease); }
.book:hover .cover img { transform: scale(1.05); }
.cover::after { content: ''; position: absolute; inset: 0; background: linear-gradient(180deg, transparent 55%, rgba(0, 0, 0, .55)); opacity: 0; transition: opacity .3s; }
.book:hover .cover::after { opacity: 1; }
.read-pill {
  position: absolute; left: 50%; bottom: 14px; z-index: 1; transform: translate(-50%, 10px); opacity: 0;
  padding: 7px 16px; border-radius: 999px; font-size: 13px; font-weight: 600; color: #fff; white-space: nowrap;
  background: linear-gradient(135deg, var(--accent), var(--accent-2)); transition: all .3s var(--ease);
}
.book:hover .read-pill { opacity: 1; transform: translate(-50%, 0); }
.book.broken .cover img { filter: grayscale(1) opacity(.55); }
.book.broken .read-pill { background: #6b6b7b; }

.placeholder {
  width: 100%; height: 100%; display: grid; place-items: center; padding: 18px; text-align: center;
  background: linear-gradient(150deg, var(--accent) 0%, var(--accent-2) 55%, #7c3aed 130%);
  color: #fff; font: 700 18px/1.25 var(--font-display);
}

/* collection (folder) card with fanned covers */
.collection .stack {
  position: relative; height: 230px; display: grid; place-items: center;
  background: radial-gradient(circle at 50% 120%, var(--accent-soft), transparent 70%), var(--bg-2);
  overflow: hidden;
}
.collection.large .stack { height: 270px; }
.stack img {
  position: absolute; height: 82%; aspect-ratio: 2 / 3; object-fit: cover; border-radius: 8px;
  box-shadow: 0 14px 28px -10px rgba(0, 0, 0, .55); transition: transform .5s var(--ease);
}
.stack.count-3 img[style*='--i:0'] { transform: translateX(-34%) rotate(-9deg) scale(.88); }
.stack.count-3 img[style*='--i:1'] { transform: translateX(34%) rotate(9deg) scale(.88); }
.stack.count-3 img[style*='--i:2'] { transform: none; z-index: 2; }
.stack.count-2 img[style*='--i:0'] { transform: translateX(-20%) rotate(-6deg) scale(.92); }
.stack.count-2 img[style*='--i:1'] { transform: translateX(20%) rotate(5deg); z-index: 2; }
.collection:hover .stack.count-3 img[style*='--i:0'] { transform: translateX(-46%) rotate(-13deg) scale(.88); }
.collection:hover .stack.count-3 img[style*='--i:1'] { transform: translateX(46%) rotate(13deg) scale(.88); }
.collection:hover .stack.count-3 img[style*='--i:2'] { transform: translateY(-6px); }
.collection:hover .stack.count-2 img[style*='--i:0'] { transform: translateX(-30%) rotate(-9deg) scale(.92); }
.collection:hover .stack.count-2 img[style*='--i:1'] { transform: translateX(28%) rotate(8deg); }
.collection .stack .placeholder { width: 55%; height: 82%; border-radius: 8px; }
.collection h3 { font: 700 20px/1.25 var(--font-display); letter-spacing: -.01em; }

/* empty / errors */
.empty-state { text-align: center; padding: 80px 24px; color: var(--muted); flex: 1; }
.empty-state h1, .empty-state h3 { color: var(--text); font-family: var(--font-display); }
.empty-icon { font-size: 46px; margin-bottom: 8px; }
.btn {
  display: inline-block; padding: 11px 22px; border-radius: 999px; color: #fff; font-weight: 600;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
}

.footer { border-top: 1px solid var(--line); padding: 22px 0; color: var(--muted); font-size: 13.5px; }

/* ---------- reader ---------- */
body.reader { height: 100vh; height: 100dvh; overflow: hidden; background: var(--reader-bg); }
.reader-bar {
  position: relative; display: flex; align-items: center; gap: 12px; padding: 10px 16px; flex: none;
  background: color-mix(in srgb, var(--bg) 88%, transparent); backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line); z-index: 5;
}
.reader-title { display: flex; flex-direction: column; min-width: 0; flex: 1; }
.reader-title strong { font: 700 17px/1.2 var(--font-display); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.reader-title span { font-size: 12.5px; color: var(--muted); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.reader-tools { display: flex; align-items: center; gap: 10px; }
.pager, .zoom { display: flex; align-items: center; gap: 6px; padding: 3px; border-radius: 14px; background: var(--bg-2); border: 1px solid var(--line); }
.pager .icon-btn, .zoom .icon-btn { width: 34px; height: 34px; border: 0; background: transparent; }
#page-num {
  width: 48px; height: 32px; text-align: center; border-radius: 9px; border: 1px solid var(--line);
  background: var(--surface); color: var(--text); font: 600 14px var(--font-body); outline: none;
}
#page-num:focus { border-color: var(--accent); }
.of { color: var(--muted); font-size: 14px; padding-right: 4px; white-space: nowrap; }
.zoom-label {
  min-width: 56px; height: 32px; border: 0; border-radius: 9px; background: var(--surface); color: var(--text);
  font: 600 13px var(--font-body); cursor: pointer;
}
.zoom-label:hover { color: var(--accent); }
.progress { position: absolute; left: 0; right: 0; bottom: -1px; height: 3px; opacity: 0; transition: opacity .4s; }
.progress.active { opacity: 1; }
.progress span { display: block; height: 100%; width: 0; background: linear-gradient(90deg, var(--accent), var(--accent-2)); transition: width .25s; }

.viewer { flex: 1; overflow: auto; position: relative; -webkit-overflow-scrolling: touch; }
.pages { display: flex; flex-direction: column; align-items: center; gap: 18px; padding: 24px 12px 60px; min-width: min-content; }
.page {
  position: relative; background: #fff; border-radius: 4px; flex: none;
  box-shadow: 0 10px 30px -12px rgba(0, 0, 0, .45), 0 0 0 1px rgba(0, 0, 0, .04);
  background-image: linear-gradient(100deg, #f1f1f4 30%, #fafafb 50%, #f1f1f4 70%);
  background-size: 300% 100%; animation: shimmer 1.6s linear infinite;
}
.page.ready { animation: none; background: #fff; }
.page canvas { display: block; width: 100%; height: 100%; border-radius: 4px; user-select: none; -webkit-user-drag: none; }
.page-label {
  position: absolute; right: -2px; bottom: -22px; font-size: 11.5px; color: var(--muted);
}
@keyframes shimmer { from { background-position: 100% 0; } to { background-position: -200% 0; } }

.viewer-status { position: absolute; inset: 0; display: grid; place-content: center; text-align: center; color: var(--muted); padding: 24px; }
.spinner {
  width: 42px; height: 42px; margin: 0 auto 14px; border-radius: 50%;
  border: 3px solid var(--accent-soft); border-top-color: var(--accent); animation: spin .8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

@media print { body { display: none !important; } }

/* ---------- responsive ---------- */
@media (max-width: 720px) {
  .wrap { padding: 0 16px; }
  .topbar-inner { height: auto; padding: 12px 0; flex-wrap: wrap; gap: 10px; }
  .search { order: 3; width: 100%; }
  .topbar .icon-btn { margin-left: auto; }
  .hero { padding: 44px 0 28px; }
  .grid { gap: 16px; }
  .grid.books { grid-template-columns: repeat(auto-fill, minmax(140px, 1fr)); }
  .grid.folders, .grid.folders.large { grid-template-columns: 1fr; }
  .reader-bar { flex-wrap: wrap; padding: 8px 10px; gap: 8px; }
  .reader-title { order: 1; flex: 1 1 calc(100% - 110px); }
  .reader-bar > [data-theme-toggle] { order: 2; }
  .reader-tools { order: 3; width: 100%; justify-content: space-between; }
  .hide-sm { display: none; }
}
@media (prefers-reduced-motion: reduce) { *, *::before, *::after { animation: none !important; transition: none !important; } }