:root{
  /* Light theme (closer to your 3rd screenshot) */
  --bg:#f3f5f8;
  --card:#ffffff;
  --card2:#ffffff;
  --text:#0c1426;
  --muted:rgba(12,20,38,.60);
  --line:rgba(12,20,38,.12);
  --accent:#7b61ff;
  --accent2:#2ac1ff;
  --danger:#ff4d6d;
  --success:#22c55e;
  --shadow:0 18px 55px rgba(10,20,40,.18);
  --radius:18px;
}

*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;
  font-family: Vazirmatn, system-ui, -apple-system, Segoe UI, Roboto, Arial;
  background:
    radial-gradient(900px 600px at 12% -10%, rgba(123,97,255,.18), transparent 60%),
    radial-gradient(900px 600px at 92% 0%, rgba(42,193,255,.14), transparent 65%),
    linear-gradient(180deg, #ffffff, var(--bg));
  color:var(--text);
}

a{color:inherit; text-decoration:none}

.header{
  position:sticky;
  top:0;
  z-index:20;
  backdrop-filter: blur(12px);
  background: linear-gradient(180deg, rgba(255,255,255,.92), rgba(255,255,255,.72));
  border-bottom:1px solid var(--line);
}

.topbar{
  max-width:1100px;
  margin:0 auto;
  padding:14px 16px;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:12px;
}

.brand .title{font-size:20px; font-weight:900; letter-spacing:-.2px}
.brand .subtitle{font-size:12px; color:var(--muted); margin-top:2px}

.controls{display:flex; gap:10px; align-items:center}
.search{
  width:min(360px, 52vw);
  height:40px;
  border-radius:999px;
  border:1px solid var(--line);
  background: rgba(12,20,38,.04);
  color:var(--text);
  padding:0 14px;
  outline:none;
}
.search::placeholder{color:rgba(12,20,38,.45)}

.select{
  height:40px;
  border-radius:999px;
  border:1px solid var(--line);
  background: rgba(12,20,38,.04);
  color:var(--text);
  padding:0 12px;
  outline:none;
}

.main{max-width:1100px; margin:0 auto; padding:18px 16px 120px}
.empty{
  margin-top:18px;
  padding:18px;
  border-radius:var(--radius);
  border:1px dashed rgba(12,20,38,.20);
  background: rgba(255,255,255,.72);
  color:var(--muted);
}

/* Shelves */
.shelves{display:flex; flex-direction:column; gap:26px}

.shelf{
  border-radius:22px;
  position:relative;
  padding:18px 16px 36px; /* leave space for wood plank */
  border:1px solid var(--line);
  background: linear-gradient(180deg, rgba(255,255,255,.92), rgba(255,255,255,.72));
  box-shadow: 0 14px 34px rgba(10,20,40,.12);
}

.shelf-top{display:flex; align-items:center; justify-content:space-between; margin-bottom:10px}
.shelf-title{font-weight:900; font-size:14px; color:rgba(12,20,38,.85)}
.shelf-count{font-size:12px; color:var(--muted)}

.bookrow{
  display:flex;
  gap:14px;
  align-items:flex-end;
  overflow-x:auto;
  overflow-y:hidden;
  padding: 4px 2px 16px;
  scroll-snap-type:x mandatory;
  -webkit-overflow-scrolling:touch;
}
.bookrow::-webkit-scrollbar{height:8px}
.bookrow::-webkit-scrollbar-thumb{background:rgba(12,20,38,.10);border-radius:999px}

.shelf-empty{font-size:12px;color:var(--muted);padding:10px 6px}

.book-card{
  position:relative;
  display:flex;
  flex-direction:column;
  gap:8px;
  cursor:pointer;
  user-select:none;
  flex:0 0 auto;
  width:160px;
  scroll-snap-align:start;
}

/* Mobile: show ~3 covers per shelf viewport then horizontal scroll */
@media (max-width: 560px){
  .bookrow{gap:10px; padding: 2px 2px 14px}
  .book-card{ width: clamp(110px, 30vw, 140px); }
  .cover{ border-radius:16px; }
}

.cover{
  width:100%;
  aspect-ratio: 3/4;
  border-radius:14px;
  overflow:hidden;
  position:relative;
  background: rgba(12,20,38,.04);
  border:1px solid rgba(12,20,38,.12);
  box-shadow: 0 10px 22px rgba(10,20,40,.14);
  transform: translateY(0);
  transition: transform .18s ease, box-shadow .18s ease;
  margin-bottom:-10px;
}
.book-card:hover .cover{transform: translateY(-4px); box-shadow: 0 14px 30px rgba(10,20,40,.22)}
.cover img{width:100%; height:100%; object-fit:cover; display:block}

.coverText{
  position:absolute;
  left:0;
  right:0;
  bottom:0;
  padding:10px 10px 12px;
  color:#fff;
  background: linear-gradient(180deg, rgba(0,0,0,0) 0%, rgba(0,0,0,.45) 55%, rgba(0,0,0,.70) 100%);
  pointer-events:none;
}
.ctTitle{font-size:12px; font-weight:900; line-height:1.25; text-shadow: 0 2px 10px rgba(0,0,0,.45)}
.ctAuthor{font-size:11px; opacity:.92; margin-top:4px; text-shadow: 0 2px 10px rgba(0,0,0,.45)}

.btitle{
  font-size:12px;
  line-height:1.3;
  color:rgba(12,20,38,.88);
  font-weight:700;
  overflow:hidden;
  display:-webkit-box;
  -webkit-line-clamp:2;
  -webkit-box-orient:vertical;
  min-height: 2.6em;
}

.wood{
  position:absolute;
  left:16px;
  right:16px;
  bottom:14px;
  height:18px;
  border-radius:999px;
  background: linear-gradient(90deg, rgba(150,102,54,.32), rgba(228,177,122,.30), rgba(150,102,54,.32));
  border:1px solid rgba(120,80,40,.22);
  box-shadow: inset 0 2px 9px rgba(80,45,20,.22), 0 10px 20px rgba(10,20,40,.10);
}

/* Floating action button */
.fab{
  position:fixed;
  right:18px;
  bottom:18px;
  width:56px;
  height:56px;
  border-radius:999px;
  border:0;
  color:white;
  font-size:30px;
  line-height:0;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  box-shadow: 0 18px 46px rgba(0,0,0,.55);
  cursor:pointer;
}

/* Modals */
.upload,.modal,.viewer{
  position:fixed;
  inset:0;
  display:none;
  align-items:center;
  justify-content:center;
  padding:16px;
  background: rgba(10,20,40,.28);
  z-index:50;
}
.upload.show,.modal.show,.viewer.show{display:flex}

.upload-card,.modal-card,.viewer-card{
  width:min(980px, 100%);
  max-height: calc(100vh - 32px);
  overflow:auto;
  border-radius: 26px;
  border: 1px solid rgba(12,20,38,.14);
  background: linear-gradient(180deg, rgba(255,255,255,.98), rgba(255,255,255,.94));
  box-shadow: var(--shadow);
}

.upload-head,.viewer-head{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:12px;
  padding:14px 16px;
  border-bottom:1px solid var(--line);
}
.upload-title,.viewer-title{font-weight:900}

.iconbtn{
  width:40px;
  height:40px;
  border-radius:12px;
  border:1px solid var(--line);
  background: rgba(12,20,38,.04);
  color:var(--text);
  cursor:pointer;
  font-size:20px;
}

.u-grid{
  display:grid;
  grid-template-columns: 1fr 1fr;
  gap:12px;
  padding:16px;
}
.u-input{
  height:42px;
  border-radius:14px;
  border:1px solid var(--line);
  background: rgba(255,255,255,.05);
  color:var(--text);
  padding:0 12px;
  outline:none;
}
.u-input.full{grid-column:1 / -1}

.file{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:10px;
  padding:12px 12px;
  border-radius:14px;
  border:1px dashed rgba(255,255,255,.18);
  background: rgba(255,255,255,.04);
  color:var(--muted);
}
.file input{color:var(--text)}
.file.full{grid-column:1 / -1}

.u-actions{display:flex; flex-wrap:wrap; gap:10px; align-items:center}
.u-actions.full{grid-column:1 / -1}

.u-hint{grid-column:1 / -1; color:var(--muted); font-size:12px; line-height:1.6}

.btn{
  height:40px;
  padding:0 14px;
  border-radius:999px;
  border:1px solid rgba(12,20,38,.14);
  background: rgba(12,20,38,.04);
  color:var(--text);
  cursor:pointer;
  font-weight:800;
}
.btn.secondary{background: rgba(12,20,38,.02)}
.btn.danger{border-color: rgba(255,77,109,.35); background: rgba(255,77,109,.12)}
.btn:active{transform: translateY(1px)}

.file-inline{position:relative; overflow:hidden}
.file-inline input{position:absolute; inset:0; opacity:0; cursor:pointer}

/* Book details modal */
.modal-card{
  display:grid;
  grid-template-columns: 320px 1fr;
  gap:0;
  overflow:hidden;
}
.modal-left{padding:18px; border-left:1px solid var(--line)}
.modal-coverWrap{
  width:100%;
  aspect-ratio: 3/4;
  border-radius:18px;
  overflow:hidden;
  border:1px solid rgba(255,255,255,.10);
  background: rgba(255,255,255,.05);
  box-shadow: 0 14px 30px rgba(0,0,0,.45);
}
.modal-coverWrap img{width:100%; height:100%; object-fit:cover; display:block}

.modal-body{padding:18px 18px 22px}
.modal-body h2{margin:0 0 6px; font-size:18px}
.meta{color:var(--muted); font-size:13px; margin-bottom:10px}
.desc{color:rgba(234,240,255,.78); line-height:1.75; margin:0 0 14px; min-height: 44px}
.btns{display:flex; flex-wrap:wrap; gap:10px}

.x{
  position:absolute;
  margin:10px;
  top:0;
  right:0;
  width:42px;
  height:42px;
  border-radius:14px;
  border:1px solid var(--line);
  background: rgba(255,255,255,.70);
  color:var(--text);
  cursor:pointer;
  font-size:20px;
  z-index:2;
}

/* Viewer */
.viewer-card{width:min(1260px, 100%); display:flex; flex-direction:column; overflow:hidden}
.viewer-shelf{padding:16px; display:flex; flex-direction:column; gap:12px; flex:1; min-height:0}
.viewer-frame{
  border-radius:22px;
  overflow:hidden;
  border:1px solid rgba(12,20,38,.14);
  background:#ffffff;
  flex:1;
  min-height: min(74vh, 860px);
}
.viewer-frame iframe{width:100%; height:100%; border:0}
.viewer-wood{height:18px; border-radius:999px; background: linear-gradient(90deg, rgba(150,102,54,.32), rgba(228,177,122,.30), rgba(150,102,54,.32)); border:1px solid rgba(120,80,40,.22); box-shadow: inset 0 2px 9px rgba(80,45,20,.22), 0 10px 20px rgba(10,20,40,.10)}
.viewer-actions{
  padding:12px 16px 14px;
  display:flex;
  gap:10px;
  flex-wrap:wrap;
  border-top:1px solid var(--line);
  background: linear-gradient(180deg, rgba(255,255,255,.70), rgba(255,255,255,.92));
}

/* Toast */
.toast{
  position:fixed;
  right:14px;
  bottom:18px;
  padding:10px 12px;
  border-radius:14px;
  border:1px solid rgba(12,20,38,.14);
  background: rgba(255,255,255,.92);
  box-shadow: 0 14px 40px rgba(10,20,40,.18);
  color:rgba(12,20,38,.88);
  max-width:min(92vw, 520px);
  z-index:80;
}

@media (max-width: 980px){
  .book-card{width:170px}
  .viewer-frame{min-height: min(72vh, 720px)}
}
@media (max-width: 720px){
  .topbar{flex-direction:column; align-items:stretch}
  .controls{justify-content:space-between}
  .search{width:100%}
  .select{min-width:120px}

  .u-grid{grid-template-columns:1fr}
  .modal-card{grid-template-columns:1fr}
  .modal-left{border-left:0; border-bottom:1px solid var(--line)}
  .viewer-shelf{padding:12px}
  .viewer-frame{min-height: min(62vh, 640px)}
}

/* Small phones: keep 3 books visible (then horizontal scroll) */
@media (max-width: 520px){
  .bookrow{gap:10px; padding-bottom:14px;}
  .book-card{width: clamp(110px, 31vw, 140px); }
  .cover{border-radius:16px; margin-bottom:-12px}
  .wood{left:12px; right:12px; height:20px}
  .viewer-frame{min-height: 74vh}
}


/* Viewer: full-height without internal scroll (no 'needs scroll' issue) */
.viewer-card{
  display:flex;
  flex-direction:column;
  height: calc(100vh - 32px);
  overflow:hidden;
}
@supports(height: 100dvh){
  .viewer-card{height: calc(100dvh - 32px);}
}
.viewer-shelf{flex:1; min-height:0;}
.viewer-frame{flex:1; min-height:0;}
.viewer-frame iframe{height:100%; width:100%;}