:root {
  --bg: #0b1020;
  --panel: rgba(255, 255, 255, 0.06);
  --panel2: rgba(255, 255, 255, 0.08);
  --text: rgba(255, 255, 255, 0.9);
  --muted: rgba(255, 255, 255, 0.65);
  --border: rgba(255, 255, 255, 0.12);
  --shadow: 0 24px 60px rgba(0, 0, 0, 0.45);
  --accent: #7c5cff;
  --accent2: #2dd4bf;
}

body[data-theme="light"] {
  --bg: #f6f7fb;
  --panel: rgba(0, 0, 0, 0.04);
  --panel2: rgba(0, 0, 0, 0.06);
  --text: rgba(10, 15, 25, 0.92);
  --muted: rgba(10, 15, 25, 0.62);
  --border: rgba(10, 15, 25, 0.12);
  --shadow: 0 24px 60px rgba(10, 15, 25, 0.14);
  --accent: #5b5ef7;
  --accent2: #0ea5e9;
}



.pdf-reader-section {
  color: var(--text);
  background:
    radial-gradient(1200px 800px at 20% -10%, rgba(124, 92, 255, 0.22), transparent 60%),
    radial-gradient(1000px 700px at 110% 20%, rgba(45, 212, 191, 0.16), transparent 55%),
    radial-gradient(1200px 800px at 30% 120%, rgba(124, 92, 255, 0.14), transparent 55%),
    var(--bg);
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 16px;
  border-bottom: 1px solid var(--border);
  background: rgba(0, 0, 0, 0.15);
  backdrop-filter: blur(10px);
}
body[data-theme="light"] .topbar { background: rgba(255, 255, 255, 0.62); }

.topbar__left, .topbar__right {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
}

.brand {
  font-weight: 650;
  letter-spacing: 0.2px;
  padding: 8px 10px;
  border-radius: 10px;
  background: linear-gradient(135deg, rgba(124, 92, 255, 0.22), rgba(45, 212, 191, 0.14));
  border: 1px solid var(--border);
}

.file input {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
}
.file span {
  display: inline-flex;
  align-items: center;
  padding: 10px 12px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: var(--panel);
  cursor: pointer;
  user-select: none;
}
.file span:hover { background: var(--panel2); }

.btn {
  padding: 10px 12px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: var(--panel);
  color: var(--text);
  cursor: pointer;
  user-select: none;
}
.btn:hover { background: var(--panel2); }
.btn:disabled { opacity: 0.45; cursor: not-allowed; }
.btn--ghost {
  background: transparent;
}

.meta {
  color: var(--muted);
  font-size: 13px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 34vw;
}

.main {
  display: grid;
  grid-template-rows: auto 1fr;
  gap: 16px;
  padding: 16px;
  max-width: 1200px;
  margin: 0 auto;
}

.dropzone {
  border: 1px dashed var(--border);
  border-radius: 18px;
  padding: 18px;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.06), rgba(255, 255, 255, 0.02));
  box-shadow: var(--shadow);
  outline: none;
}
body[data-theme="light"] .dropzone {
  background: linear-gradient(180deg, rgba(0, 0, 0, 0.03), rgba(0, 0, 0, 0.01));
}
.dropzone:focus { box-shadow: var(--shadow), 0 0 0 3px rgba(124, 92, 255, 0.28); }
.dropzone.dragover { border-color: rgba(124, 92, 255, 0.7); }
.dropzone__inner { display: grid; gap: 6px; text-align: center; }
.dropzone__title { font-size: 16px; font-weight: 650; }
.dropzone__subtitle { color: var(--muted); font-size: 13px; }

.viewer {
  display: grid;
  justify-items: center;
  gap: 10px;
}

.book {
  width: min(1100px, 94vw);
  height: min(720px, calc(100vh - 230px));
  border-radius: 18px;
  overflow: hidden;
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  background: rgba(0, 0, 0, 0.18);
  position: relative;
  display: block;
}
body[data-theme="light"] .book { background: rgba(255, 255, 255, 0.75); }

.hint { color: var(--muted); font-size: 13px; }

/* Page elements used by PageFlip */
.page {
  width: 100%;
  height: 100%;
  background: white;
  display: grid;
  place-items: center;
  overflow: hidden;
}
.page canvas {
  width: 100%;
  height: 100%;
  display: block;
}

.page img {
  width: 100%;
  height: 100%;
  display: block;
  object-fit: cover;
}