*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{
  --bg:#0d0d1a;--bg2:#13132a;--bg3:#1a1a35;
  --primary:#6c63ff;--primary-d:#4c46cc;
  --green:#4ecb71;--wa:#25D366;--red:#ff6b6b;
  --gold:#ffd700;--text:#f0f0ff;--muted:#8888aa;
  --border:rgba(108,99,255,.2);--glass:rgba(255,255,255,.05);
  --glow:rgba(108,99,255,.4);--radius:12px;
  --toolbar-h:56px;--status-h:36px;--sidebar-w:220px;--tools-w:240px;
}
html{font-family:'Inter',sans-serif;font-size:15px}
body{background:var(--bg);color:var(--text);overflow:hidden;height:100vh}
body.light-mode{--bg:#f5f5fa;--bg2:#fff;--bg3:#eef;--text:#111;--muted:#555;--border:rgba(0,0,0,.1);--glass:rgba(0,0,0,.04)}

/* ── UPLOAD SCREEN ── */
.upload-screen{
  position:fixed;inset:0;display:flex;align-items:center;
  justify-content:center;background:var(--bg);z-index:100;overflow:hidden;
}
.upload-bg{position:absolute;inset:0;pointer-events:none}
.upload-orb{position:absolute;border-radius:50%;filter:blur(80px);opacity:.12}
.upload-orb.o1{width:500px;height:500px;background:#6c63ff;top:-150px;left:-150px}
.upload-orb.o2{width:350px;height:350px;background:#ff6b6b;bottom:-100px;right:-100px}
.upload-panel{
  position:relative;z-index:1;background:var(--bg2);border:1px solid var(--border);
  border-radius:24px;padding:40px;max-width:520px;width:90%;text-align:center;
  box-shadow:0 40px 80px rgba(0,0,0,.5);
}
.back-home{display:block;text-align:left;color:var(--muted);text-decoration:none;font-size:.85rem;margin-bottom:16px;transition:color .2s}
.back-home:hover{color:var(--text)}
.upload-logo{font-size:1.8rem;font-weight:800;margin-bottom:20px;letter-spacing:-1px}
.upload-logo span{background:linear-gradient(135deg,#6c63ff,#ff6b6b);-webkit-background-clip:text;-webkit-text-fill-color:transparent}
.upload-panel h2{font-size:1.5rem;font-weight:700;margin-bottom:8px}
.upload-panel p{color:var(--muted);margin-bottom:28px;font-size:.9rem}
.drop-zone{
  border:2px dashed var(--border);border-radius:16px;padding:36px 24px;
  margin-bottom:20px;transition:all .3s;cursor:pointer;
}
.drop-zone.dragging{border-color:var(--primary);background:rgba(108,99,255,.08)}
.drop-icon{font-size:3rem;margin-bottom:12px}
.drop-text{font-size:1.1rem;font-weight:600;margin-bottom:4px}
.drop-sub{color:var(--muted);font-size:.85rem;margin-bottom:20px}
.upload-btn{
  display:inline-block;background:var(--primary);color:#fff;
  padding:12px 28px;border-radius:50px;font-weight:700;cursor:pointer;
  transition:all .3s;font-size:.95rem;
}
.upload-btn:hover{background:var(--primary-d);transform:translateY(-2px)}
.upload-formats{display:flex;flex-wrap:wrap;gap:8px;justify-content:center;margin-top:20px}
.fmt-chip{padding:4px 12px;border-radius:20px;font-size:.75rem;font-weight:700}
.fmt-chip.pdf{background:rgba(255,107,107,.15);color:#ff6b6b}
.fmt-chip.img{background:rgba(78,203,113,.15);color:var(--green)}
.fmt-chip.txt{background:rgba(108,99,255,.15);color:var(--primary)}
.fmt-chip.xls{background:rgba(34,197,94,.15);color:#22c55e}
.fmt-chip.ppt{background:rgba(255,165,0,.15);color:orange}
.fmt-chip.doc{background:rgba(59,130,246,.15);color:#3b82f6}
.recent-files{margin-top:24px;text-align:left}
.recent-files h4{font-size:.9rem;font-weight:700;color:var(--muted);margin-bottom:10px}
.recent-item{
  display:flex;align-items:center;gap:10px;padding:10px 12px;
  background:var(--glass);border-radius:10px;margin-bottom:6px;
  cursor:pointer;transition:all .2s;border:1px solid var(--border);font-size:.85rem;
}
.recent-item:hover{background:rgba(108,99,255,.1);border-color:var(--primary)}
.recent-item-icon{font-size:1.2rem}
.recent-item-info{flex:1;min-width:0}
.recent-item-name{font-weight:600;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.recent-item-date{font-size:.75rem;color:var(--muted)}

/* ── READER APP ── */
.reader-app{display:flex;flex-direction:column;height:100vh;overflow:hidden}

/* TOP BAR */
.top-bar{
  height:var(--toolbar-h);background:var(--bg2);border-bottom:1px solid var(--border);
  display:flex;align-items:center;padding:0 12px;gap:8px;flex-shrink:0;
  backdrop-filter:blur(10px);z-index:50;
}
.tb-left,.tb-right{display:flex;align-items:center;gap:6px;flex:1}
.tb-right{justify-content:flex-end}
.tb-center{display:flex;align-items:center;gap:8px}
.tb-btn{
  background:var(--glass);border:1px solid var(--border);color:var(--text);
  padding:7px 12px;border-radius:8px;cursor:pointer;font-size:.85rem;font-weight:600;
  transition:all .2s;white-space:nowrap;
}
.tb-btn:hover{background:rgba(108,99,255,.15);border-color:var(--primary)}
.pro-locked{opacity:.6;position:relative}
.pro-pill{
  font-size:.6rem;background:linear-gradient(135deg,#ffd700,#ff8c00);
  -webkit-background-clip:text;-webkit-text-fill-color:transparent;font-weight:800;
}
.file-name-display{font-size:.85rem;font-weight:600;color:var(--muted);max-width:200px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.page-info{font-size:.9rem;font-weight:700;min-width:80px;text-align:center}
.zoom-text{font-size:.85rem;font-weight:700;min-width:40px;text-align:center}

/* LAYOUT */
.reader-layout{display:flex;flex:1;overflow:hidden}

/* SIDEBAR */
.sidebar{
  width:var(--sidebar-w);background:var(--bg2);border-right:1px solid var(--border);
  display:flex;flex-direction:column;flex-shrink:0;overflow:hidden;
  transition:width .3s;
}
.sidebar-tabs{display:flex;border-bottom:1px solid var(--border);flex-shrink:0}
.stab{
  flex:1;padding:10px 4px;background:none;border:none;color:var(--muted);
  font-size:.72rem;font-weight:600;cursor:pointer;transition:all .2s;border-bottom:2px solid transparent;
}
.stab.active{color:var(--primary);border-bottom-color:var(--primary)}
.sidebar-content{flex:1;overflow-y:auto;padding:8px}
.sidebar-content::-webkit-scrollbar{width:4px}
.sidebar-content::-webkit-scrollbar-thumb{background:var(--border);border-radius:2px}
.thumb-item{
  cursor:pointer;border-radius:8px;overflow:hidden;margin-bottom:8px;
  border:2px solid transparent;transition:all .2s;
}
.thumb-item.active{border-color:var(--primary)}
.thumb-item canvas{width:100%;display:block}
.thumb-page-num{text-align:center;font-size:.7rem;color:var(--muted);padding:3px}

/* MAIN READER */
.reader-main{flex:1;overflow:auto;background:var(--bg3);display:flex;align-items:flex-start;justify-content:center;padding:20px}
.reader-main::-webkit-scrollbar{width:8px;height:8px}
.reader-main::-webkit-scrollbar-thumb{background:rgba(108,99,255,.3);border-radius:4px}
.reader-viewport{position:relative;display:inline-block}
#pdfCanvas{display:block;max-width:100%;box-shadow:0 8px 40px rgba(0,0,0,.4);border-radius:4px}
.text-layer{
  position:absolute;top:0;left:0;right:0;bottom:0;
  overflow:hidden;line-height:1;pointer-events:none;
}
.text-layer span{color:transparent;position:absolute;white-space:pre;cursor:text;pointer-events:all;transform-origin:0% 0%}
.text-layer span::selection{background:rgba(108,99,255,.3)}
.image-viewer{display:flex;align-items:center;justify-content:center;padding:20px}
.image-viewer img{max-width:100%;max-height:calc(100vh - 150px);border-radius:8px;box-shadow:0 8px 40px rgba(0,0,0,.4)}
.txt-viewer{
  background:var(--bg2);border-radius:12px;padding:40px;max-width:800px;width:100%;
  font-size:1rem;line-height:1.8;white-space:pre-wrap;font-family:'Inter',sans-serif;
  box-shadow:0 8px 40px rgba(0,0,0,.3);
}
.xls-viewer{width:100%;overflow:auto}
.xls-viewer table{border-collapse:collapse;width:100%;background:var(--bg2);border-radius:12px;overflow:hidden;box-shadow:0 8px 40px rgba(0,0,0,.3)}
.xls-viewer th{background:rgba(108,99,255,.2);color:var(--primary);padding:10px 14px;font-size:.8rem;font-weight:700;border:1px solid var(--border);text-align:left}
.xls-viewer td{padding:8px 14px;font-size:.82rem;border:1px solid var(--border)}
.xls-viewer tr:nth-child(even){background:rgba(255,255,255,.02)}
.loading-spinner{
  display:flex;flex-direction:column;align-items:center;justify-content:center;
  padding:80px;gap:16px;color:var(--muted);font-size:.9rem;
}
.spinner-ring{
  width:48px;height:48px;border:3px solid var(--border);
  border-top-color:var(--primary);border-radius:50%;animation:spin 1s linear infinite;
}
@keyframes spin{to{transform:rotate(360deg)}}

/* TOOLS PANEL */
.tools-panel{
  width:var(--tools-w);background:var(--bg2);border-left:1px solid var(--border);
  overflow-y:auto;flex-shrink:0;padding:12px;display:flex;flex-direction:column;gap:12px;
}
.tools-panel::-webkit-scrollbar{width:4px}
.tools-panel::-webkit-scrollbar-thumb{background:var(--border);border-radius:2px}
.tool-section{background:var(--bg3);border:1px solid var(--border);border-radius:12px;padding:14px}
.tool-title{font-size:.8rem;font-weight:700;color:var(--muted);margin-bottom:10px;letter-spacing:.5px;text-transform:uppercase}
.voice-controls{display:flex;gap:8px;margin-bottom:10px}
.voice-btn{
  flex:1;padding:9px;border-radius:8px;border:none;font-size:.82rem;
  font-weight:700;cursor:pointer;transition:all .2s;
}
.play-btn{background:var(--primary);color:#fff}
.play-btn:hover{background:var(--primary-d)}
.stop-btn{background:rgba(255,107,107,.15);color:#ff6b6b;border:1px solid rgba(255,107,107,.3)}
.stop-btn:hover{background:rgba(255,107,107,.3)}
.voice-settings{display:flex;align-items:center;gap:8px;margin-bottom:8px;font-size:.78rem;color:var(--muted)}
.voice-settings label{min-width:45px;font-weight:600}
.voice-settings input[type=range]{flex:1;accent-color:var(--primary)}
.voice-settings span{min-width:24px;font-weight:700;color:var(--text)}
.voice-wave-display{display:flex;align-items:center;justify-content:center;gap:3px;padding:10px;margin-top:4px}
.wave-bar{width:4px;background:var(--primary);border-radius:2px;animation:wv 1s ease-in-out infinite}
.wave-bar:nth-child(1){height:8px}.wave-bar:nth-child(2){height:18px;animation-delay:.1s}
.wave-bar:nth-child(3){height:26px;animation-delay:.2s}.wave-bar:nth-child(4){height:18px;animation-delay:.3s}
.wave-bar:nth-child(5){height:8px;animation-delay:.4s}
@keyframes wv{0%,100%{transform:scaleY(1)}50%{transform:scaleY(.3)}}
.voice-status{font-size:.75rem;color:var(--muted);text-align:center;margin-top:6px}
.share-btn{
  display:block;width:100%;padding:9px;border-radius:8px;border:none;
  font-size:.82rem;font-weight:700;cursor:pointer;margin-bottom:6px;transition:all .2s;text-align:center;
}
.wa-share{background:rgba(37,211,102,.15);color:var(--wa);border:1px solid rgba(37,211,102,.3)}
.wa-share:hover{background:rgba(37,211,102,.3)}
.copy-share{background:rgba(108,99,255,.15);color:var(--primary);border:1px solid var(--border)}
.copy-share:hover{background:rgba(108,99,255,.3)}
.dl-share{background:rgba(78,203,113,.15);color:var(--green);border:1px solid rgba(78,203,113,.3)}
.dl-share:hover{background:rgba(78,203,113,.3)}
.display-btns{display:flex;flex-direction:column;gap:6px}
.disp-btn{
  padding:8px;border-radius:8px;background:var(--glass);border:1px solid var(--border);
  color:var(--text);font-size:.8rem;font-weight:600;cursor:pointer;transition:all .2s;
}
.disp-btn:hover{background:rgba(108,99,255,.15);border-color:var(--primary)}
.pro-section{border-color:rgba(255,215,0,.2)}
.pro-tag-sm{
  font-size:.6rem;background:linear-gradient(135deg,#ffd700,#ff8c00);
  -webkit-background-clip:text;-webkit-text-fill-color:transparent;font-weight:800;
}
.pro-lock-card{text-align:center;padding:4px}
.pro-lock-icon{font-size:2rem;margin-bottom:8px}
.pro-lock-card p{font-size:.8rem;color:var(--muted);margin-bottom:12px}
.pro-list{list-style:none;text-align:left;margin-bottom:16px}
.pro-list li{font-size:.78rem;padding:4px 0;color:var(--text-secondary);border-bottom:1px solid rgba(255,255,255,.04)}
.upgrade-btn{
  display:block;background:linear-gradient(135deg,#ffd700,#ff8c00);
  color:#000;padding:10px;border-radius:8px;font-weight:800;
  font-size:.82rem;text-decoration:none;text-align:center;transition:all .3s;
}
.upgrade-btn:hover{transform:translateY(-2px);box-shadow:0 8px 24px rgba(255,215,0,.3)}

/* STATUS BAR */
.status-bar{
  height:var(--status-h);background:var(--bg2);border-top:1px solid var(--border);
  display:flex;align-items:center;padding:0 16px;gap:12px;flex-shrink:0;font-size:.78rem;
}
.sb-left,.sb-right{display:flex;align-items:center;gap:8px;flex:1}
.sb-right{justify-content:flex-end}
.sb-center{display:flex;align-items:center;gap:8px;flex:2}
.file-type-tag{
  padding:2px 8px;border-radius:4px;font-weight:700;font-size:.7rem;background:rgba(108,99,255,.2);color:var(--primary);
}
.progress-saved{color:var(--green);font-size:.72rem;font-weight:600}
.reading-progress{flex:1;height:4px;background:rgba(255,255,255,.08);border-radius:2px;overflow:hidden}
.progress-bar{height:100%;background:linear-gradient(90deg,var(--primary),#ff6b6b);border-radius:2px;transition:width .5s}
.meta-info{color:var(--muted)}

/* MODAL */
.modal-overlay{
  position:fixed;inset:0;background:rgba(0,0,0,.7);backdrop-filter:blur(8px);
  display:flex;align-items:center;justify-content:center;z-index:9999;
}
.modal-box{
  background:var(--bg2);border:1px solid var(--border);border-radius:24px;
  padding:36px;max-width:440px;width:90%;text-align:center;position:relative;
  box-shadow:0 40px 80px rgba(0,0,0,.5);animation:modalIn .3s ease;
}
@keyframes modalIn{from{opacity:0;transform:scale(.9)}to{opacity:1;transform:scale(1)}}
.modal-close{
  position:absolute;top:14px;right:16px;background:none;border:none;
  color:var(--muted);font-size:1.2rem;cursor:pointer;
}
.modal-icon{font-size:3rem;margin-bottom:12px}
.modal-box h3{font-size:1.5rem;font-weight:800;margin-bottom:8px}
.modal-box p{color:var(--muted);margin-bottom:16px}
.modal-features{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin-bottom:20px}
.mf{background:rgba(255,215,0,.08);border:1px solid rgba(255,215,0,.15);border-radius:8px;padding:8px;font-size:.8rem;font-weight:600}
.modal-price{margin-bottom:20px}
.old-price{text-decoration:line-through;color:var(--muted);margin-right:8px;font-size:1rem}
.new-price{font-size:2rem;font-weight:900;color:var(--gold)}
.new-price small{font-size:.9rem;color:var(--muted)}
.modal-upgrade-btn{
  display:block;background:linear-gradient(135deg,#ffd700,#ff8c00);color:#000;
  padding:14px;border-radius:50px;font-weight:800;font-size:1rem;text-decoration:none;
  margin-bottom:12px;transition:all .3s;
}
.modal-upgrade-btn:hover{transform:translateY(-2px);box-shadow:0 12px 30px rgba(255,215,0,.3)}
.modal-skip{background:none;border:none;color:var(--muted);cursor:pointer;font-size:.85rem}
.modal-skip:hover{color:var(--text)}

/* TOAST */
.toast-container{position:fixed;bottom:60px;right:20px;display:flex;flex-direction:column;gap:8px;z-index:9999}
.toast{
  background:var(--bg2);border:1px solid var(--border);border-radius:10px;
  padding:12px 16px;font-size:.85rem;font-weight:600;min-width:200px;
  animation:toastIn .3s ease;box-shadow:0 8px 30px rgba(0,0,0,.3);
}
.toast.success{border-color:rgba(78,203,113,.4);color:var(--green)}
.toast.info{border-color:var(--border);color:var(--text)}
.toast.error{border-color:rgba(255,107,107,.4);color:#ff6b6b}
@keyframes toastIn{from{opacity:0;transform:translateX(20px)}to{opacity:1;transform:translateX(0)}}

/* RESPONSIVE */
@media(max-width:900px){
  .sidebar{display:none}
  .tools-panel{width:200px}
  :root{--tools-w:200px}
}
@media(max-width:640px){
  .tools-panel{display:none}
  .tb-left .file-name-display{display:none}
  .top-bar{padding:0 8px;gap:4px}
  .tb-btn{padding:6px 8px;font-size:.78rem}
}