:root{
  --bg:#0b0f19;
  --card:#111827;
  --text:#e5e7eb;
  --muted:#9ca3af;
  --border:rgba(255,255,255,.10);
  --shadow:0 18px 60px rgba(0,0,0,.45);
}

*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;
  background:radial-gradient(1200px 600px at 20% 10%, rgba(99,102,241,.25), transparent 60%),
             radial-gradient(1000px 700px at 80% 20%, rgba(34,197,94,.18), transparent 60%),
             var(--bg);
  color:var(--text);
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji","Segoe UI Emoji";
}

.topbar{
  display:flex;
  align-items:center;
  justify-content:space-between;
  padding:14px 18px;
  border-bottom:1px solid var(--border);
  background:rgba(17,24,39,.65);
  backdrop-filter: blur(10px);
  position:sticky;
  top:0;
  z-index:20;
}

.brand{font-weight:700; letter-spacing:.3px}
.actions{display:flex; gap:10px}
.btn{
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:10px 12px;
  border:1px solid var(--border);
  border-radius:12px;
  color:var(--text);
  text-decoration:none;
  background:rgba(255,255,255,.05);
}
.btn:hover{background:rgba(255,255,255,.09)}

.wrap{
  padding:22px 14px 30px;
  max-width: 1100px;
  margin:0 auto;
}

.book-shell{
  width:100%;
  display:flex;
  justify-content:center;
}

.book{
  width:min(980px, 96vw);
  height:min(640px, 70vh);
  margin-top:18px;
  border-radius:18px;
  box-shadow: var(--shadow);
  background:rgba(17,24,39,.65);
  border:1px solid var(--border);
  overflow:hidden;
  position:relative;
}

.page{
  background:#fff;
  display:flex;
  align-items:center;
  justify-content:center;
}

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

.status{
  display:flex;
  align-items:center;
  gap:12px;
  padding:14px 16px;
  border:1px solid var(--border);
  border-radius:14px;
  background:rgba(17,24,39,.6);
  width:fit-content;
  margin:0 auto;
}
.status-text{color:var(--muted); font-size:14px}

.spinner{
  width:18px;height:18px;border-radius:999px;
  border:2px solid rgba(229,231,235,.25);
  border-top-color: rgba(229,231,235,.95);
  animation:spin 1s linear infinite;
}

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

.help{
  text-align:center;
  color:var(--muted);
  padding:0 14px 26px;
  font-size:13px;
}