@import url('https://fonts.googleapis.com/css2?family=Space+Mono:wght@400;700&family=Bebas+Neue&family=DM+Sans:wght@300;400;500&display=swap');

:root {
  --bg:#0a0a0a; --surface:#111; --surface2:#1c1c1c; --border:#272727;
  --text:#f0f0f0; --muted:#555; --accent:#e8ff47; --focus:#e8ff47;
  --r:5px; --t:.18s ease; --sidebar:300px;
  --bar-h:64px;
  --toolbar-h:52px;
}
[data-theme="light"] {
  --bg:#f4f1ea; --surface:#ebe7dc; --surface2:#dedad0; --border:#cdc9be;
  --text:#1a1a1a; --muted:#888; --accent:#1a1a1a; --focus:#c94f1a;
}

/* ══════════════════════════════════════════
   BASE
══════════════════════════════════════════ */
*{margin:0;padding:0;box-sizing:border-box;-webkit-tap-highlight-color:transparent;}
html,body{
  height:100%; height:100dvh;
  font-family:'DM Sans',sans-serif;
  background:var(--bg); color:var(--text);
  transition:background var(--t),color var(--t);
  overflow:hidden;
}

/* ══════════════════════════════════════════
   SCREENS
══════════════════════════════════════════ */
.screen{display:none;width:100%;height:100%;height:100dvh;}
.screen.active{display:flex;}

/* ══════════════════════════════════════════
   UPLOAD SCREEN
══════════════════════════════════════════ */
#upload-screen{
  flex-direction:column;align-items:center;justify-content:center;
  gap:32px;padding:24px;position:relative;
}
.bg-grid{
  position:absolute;inset:0;pointer-events:none;opacity:.25;
  background-image:
    linear-gradient(var(--border) 1px,transparent 1px),
    linear-gradient(90deg,var(--border) 1px,transparent 1px);
  background-size:40px 40px;
}
.logo{
  font-family:'Bebas Neue',cursive;
  font-size:clamp(2.8rem,8vw,5rem);
  letter-spacing:.08em;color:var(--text);position:relative;z-index:1;
}
.logo span{color:var(--accent);}
.tagline{
  font-family:'Space Mono',monospace;font-size:.7rem;
  color:var(--muted);letter-spacing:.2em;text-transform:uppercase;
  margin-top:-26px;z-index:1;
}
.drop-zone{
  width:min(440px,92vw);border:2px dashed var(--border);border-radius:10px;
  padding:clamp(32px,8vw,56px) clamp(20px,6vw,40px);
  text-align:center;cursor:pointer;
  transition:border-color var(--t),background var(--t);
  background:var(--surface);position:relative;z-index:1;
}
.drop-zone:hover,.drop-zone.drag-over{border-color:var(--accent);background:var(--surface2);}
.drop-icon{font-size:2.8rem;margin-bottom:14px;display:block;}
.drop-zone h2{font-size:1rem;font-weight:500;margin-bottom:6px;}
.drop-zone p{font-size:.75rem;color:var(--muted);font-family:'Space Mono',monospace;}
#file-input{display:none;}

/* ══════════════════════════════════════════
   UPLOAD DIVIDER + PASTE ZONE
══════════════════════════════════════════ */
.upload-divider{
  font-family:'Space Mono',monospace;font-size:.6rem;
  color:var(--muted);letter-spacing:.18em;text-transform:uppercase;
  display:flex;align-items:center;gap:10px;width:min(440px,92vw);
  position:relative;z-index:1;
}
.upload-divider::before,.upload-divider::after{content:'';flex:1;height:1px;background:var(--border);}
.paste-zone{
  width:min(440px,92vw);display:flex;flex-direction:column;
  gap:8px;position:relative;z-index:1;
}
.paste-zone textarea{
  width:100%;height:90px;background:var(--surface);
  border:1px solid var(--border);border-radius:8px;
  color:var(--text);font-family:'DM Sans',sans-serif;
  font-size:.82rem;padding:10px 12px;resize:vertical;
  outline:none;transition:border-color var(--t);
}
.paste-zone textarea:focus{border-color:var(--accent);}
.paste-zone textarea::placeholder{
  color:var(--muted);font-family:'Space Mono',monospace;
  font-size:.62rem;letter-spacing:.05em;
}
#paste-btn{
  width:100%;padding:10px;background:var(--surface);
  color:var(--text);border:1px solid var(--border);
  border-radius:6px;font-family:'Space Mono',monospace;
  font-size:.68rem;font-weight:700;letter-spacing:.1em;
  cursor:pointer;transition:background var(--t),border-color var(--t);
}
#paste-btn:hover{background:var(--surface2);border-color:var(--accent);}

/* ══════════════════════════════════════════
   TOP TOOLBAR
══════════════════════════════════════════ */
.top-toolbar{
  position:fixed;top:10px;right:10px;z-index:500;
  display:flex;align-items:center;gap:7px;
}
.tbtn{
  width:38px;height:38px;border-radius:50%;
  background:var(--surface);border:1px solid var(--border);
  color:var(--text);font-size:1rem;cursor:pointer;
  display:flex;align-items:center;justify-content:center;
  transition:background var(--t),border-color var(--t);
  flex-shrink:0;
}
.tbtn:hover{background:var(--surface2);border-color:var(--accent);}

/* ══════════════════════════════════════════
   SETTINGS PANEL
══════════════════════════════════════════ */
.settings-panel{
  position:fixed;top:56px;right:10px;z-index:490;
  background:var(--surface);border:1px solid var(--border);
  border-radius:10px;padding:18px;width:230px;
  display:none;flex-direction:column;gap:14px;
  box-shadow:0 8px 32px rgba(0,0,0,.55);
}
.settings-panel.open{display:flex;}
.stitle{
  font-family:'Bebas Neue',cursive;font-size:1.05rem;
  letter-spacing:.08em;border-bottom:1px solid var(--border);
  padding-bottom:10px;
}
.srow{display:flex;align-items:center;justify-content:space-between;gap:8px;}
.srow span{font-family:'Space Mono',monospace;font-size:.62rem;color:var(--muted);letter-spacing:.06em;}
.tog{position:relative;width:36px;height:20px;flex-shrink:0;}
.tog input{display:none;}
.tog .sl{position:absolute;inset:0;background:var(--surface2);border:1px solid var(--border);border-radius:20px;cursor:pointer;transition:background var(--t);}
.tog .sl:before{content:'';position:absolute;width:12px;height:12px;left:3px;top:3px;background:var(--muted);border-radius:50%;transition:transform var(--t),background var(--t);}
.tog input:checked+.sl{background:var(--accent);border-color:var(--accent);}
.tog input:checked+.sl:before{transform:translateX(16px);background:var(--bg);}
.ssel{
  background:var(--surface2);border:1px solid var(--border);
  color:var(--text);padding:4px 7px;font-family:'Space Mono',monospace;
  font-size:.62rem;border-radius:4px;cursor:pointer;
}

/* ══════════════════════════════════════════
   READER SCREEN
══════════════════════════════════════════ */
#reader-screen{flex-direction:column;background:var(--bg);}
.toolbar-spacer{height:var(--toolbar-h);flex-shrink:0;}
.reader-body{flex:1;display:flex;overflow:hidden;min-height:0;}

/* ══════════════════════════════════════════
   SIDEBAR
══════════════════════════════════════════ */
.book-sidebar{
  width:var(--sidebar);flex-shrink:0;
  border-right:1px solid var(--border);
  background:var(--surface);
  display:flex;flex-direction:column;
  overflow:hidden;
  transition:width var(--t);
}
.book-sidebar.collapsed{width:0;border-right:none;}
.sb-header{
  padding:10px 12px;border-bottom:1px solid var(--border);
  display:flex;align-items:center;gap:8px;flex-shrink:0;
}
.sb-title{
  font-family:'Space Mono',monospace;font-size:.58rem;
  color:var(--muted);letter-spacing:.1em;text-transform:uppercase;
  flex:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;
}
.sb-hint{
  font-family:'Space Mono',monospace;font-size:.5rem;
  color:var(--accent);letter-spacing:.04em;white-space:nowrap;
  background:rgba(232,255,71,.07);padding:2px 7px;
  border-radius:10px;border:1px solid rgba(232,255,71,.18);flex-shrink:0;
}
[data-theme="light"] .sb-hint{color:var(--focus);background:rgba(201,79,26,.07);border-color:rgba(201,79,26,.18);}

.book-pages{
  flex:1;overflow-y:auto;padding:10px;
  display:flex;flex-direction:column;gap:10px;
}
.book-pages::-webkit-scrollbar{width:3px;}
.book-pages::-webkit-scrollbar-thumb{background:var(--border);border-radius:2px;}

.page-wrap{
  border:1px solid var(--border);border-radius:5px;
  overflow:hidden;background:#1a1a1a;flex-shrink:0;cursor:text;
}
[data-theme="light"] .page-wrap{background:#fafafa;}
.page-wrap canvas{display:block;width:100%;height:auto;}
.page-label{
  font-family:'Space Mono',monospace;font-size:.5rem;
  color:var(--muted);text-align:center;padding:3px 0;
  background:var(--surface2);letter-spacing:.08em;
}
.epub-text{
  font-size:.82rem;line-height:1.75;color:var(--text);
  cursor:text;user-select:text;padding:12px 14px;
}
.epub-text p{margin-bottom:.72em;}
.epub-text p:last-child{margin:0;}

/* Jump tooltip */
.jump-tip{
  position:fixed;z-index:600;
  background:var(--accent);color:var(--bg);
  font-family:'Space Mono',monospace;font-size:.62rem;font-weight:700;
  letter-spacing:.05em;padding:7px 14px;border-radius:5px;
  cursor:pointer;display:none;white-space:nowrap;
  box-shadow:0 4px 20px rgba(0,0,0,.5);
  transform:translateX(-50%);
}
.jump-tip::after{
  content:'';position:absolute;top:100%;left:50%;
  transform:translateX(-50%);
  border:5px solid transparent;border-top-color:var(--accent);
}

/* ══════════════════════════════════════════
   WORD AREA
══════════════════════════════════════════ */
.reader-word-area{
  flex:1;display:flex;align-items:center;justify-content:center;
  flex-direction:column;gap:18px;padding:20px;
  position:relative;cursor:pointer;min-width:0;
}
.prog-wrap{position:absolute;top:0;left:0;right:0;height:2px;background:var(--border);}
.prog-bar{height:100%;background:var(--accent);width:0%;transition:width .1s linear;}

#display-word{
  font-family:'Bebas Neue',cursive;
  font-size:clamp(3rem,11vw,9rem);
  color:var(--text);letter-spacing:.04em;
  text-align:center;user-select:none;line-height:1;
}
#display-word .fl{color:var(--focus);}

.word-counter{
  font-family:'Space Mono',monospace;font-size:.62rem;
  color:var(--muted);letter-spacing:.14em;
}
.overlay{
  position:absolute;inset:0;display:flex;flex-direction:column;
  align-items:center;justify-content:center;gap:10px;
  pointer-events:none;opacity:0;transition:opacity .25s;
}
.overlay.show{opacity:1;}
.overlay big{font-family:'Bebas Neue',cursive;font-size:1.6rem;color:var(--muted);letter-spacing:.1em;}
.overlay small{font-family:'Space Mono',monospace;font-size:.6rem;color:var(--muted);letter-spacing:.12em;}

/* ══════════════════════════════════════════
   CONTEXT WORDS
══════════════════════════════════════════ */
.ctx-word{
  font-family:'Bebas Neue',cursive;
  font-size:clamp(1.4rem,4.5vw,3.2rem);
  color:var(--text);opacity:0;
  letter-spacing:.04em;user-select:none;
  transition:opacity .12s;
  max-width:38vw;overflow:hidden;text-overflow:ellipsis;
  white-space:nowrap;pointer-events:none;
  min-height:1.1em;
}
.ctx-word.visible{opacity:.15;}

/* ══════════════════════════════════════════
   STATS OVERLAY
══════════════════════════════════════════ */
.stats-overlay{
  position:absolute;inset:0;
  display:flex;flex-direction:column;align-items:center;justify-content:center;
  gap:16px;background:var(--bg);
  opacity:0;pointer-events:none;transition:opacity .3s;z-index:10;
}
.stats-overlay.show{opacity:1;pointer-events:auto;}
.stats-title{
  font-family:'Bebas Neue',cursive;
  font-size:clamp(2rem,6vw,3.5rem);
  letter-spacing:.1em;color:var(--accent);
}
.stats-grid{display:flex;gap:16px;flex-wrap:wrap;justify-content:center;}
.stat-box{
  text-align:center;background:var(--surface);
  border:1px solid var(--border);border-radius:8px;
  padding:14px 20px;min-width:88px;
}
.stat-val{
  font-family:'Bebas Neue',cursive;
  font-size:clamp(1.8rem,4.5vw,2.6rem);
  color:var(--text);letter-spacing:.06em;
}
.stat-lbl{
  font-family:'Space Mono',monospace;font-size:.5rem;
  color:var(--muted);letter-spacing:.12em;text-transform:uppercase;margin-top:3px;
}
.stats-again-btn{
  padding:10px 28px;background:var(--accent);color:var(--bg);
  border:none;border-radius:6px;font-family:'Space Mono',monospace;
  font-size:.68rem;font-weight:700;letter-spacing:.1em;
  cursor:pointer;transition:opacity var(--t);
}
.stats-again-btn:hover{opacity:.82;}

/* ══════════════════════════════════════════
   ADAPTIVE SPEED TOAST
══════════════════════════════════════════ */
.adapt-toast{
  position:fixed;bottom:calc(var(--bar-h) + 10px);left:50%;transform:translateX(-50%);
  background:var(--surface2);border:1px solid var(--border);
  color:var(--muted);font-family:'Space Mono',monospace;
  font-size:.58rem;letter-spacing:.1em;padding:5px 14px;
  border-radius:20px;pointer-events:none;
  opacity:0;transition:opacity .2s;z-index:400;white-space:nowrap;
}
.adapt-toast.show{opacity:1;}

/* ══════════════════════════════════════════
   CONTROLS BAR
══════════════════════════════════════════ */
.controls-bar{
  background:var(--surface);border-top:1px solid var(--border);
  height:var(--bar-h);
  padding:0 16px;
  display:flex;align-items:center;gap:10px;
  flex-shrink:0;
}
.cg{display:flex;align-items:center;gap:6px;}
.clabel{
  font-family:'Space Mono',monospace;font-size:.58rem;
  color:var(--muted);letter-spacing:.09em;text-transform:uppercase;white-space:nowrap;
}
.btn{
  background:var(--surface2);border:1px solid var(--border);color:var(--text);
  border-radius:var(--r);padding:7px 13px;
  font-family:'Space Mono',monospace;font-size:.7rem;
  cursor:pointer;letter-spacing:.04em;white-space:nowrap;
  transition:background var(--t),border-color var(--t),color var(--t);
}
.btn:hover{background:var(--border);border-color:var(--accent);}
.btn.primary{background:var(--accent);color:var(--bg);border-color:var(--accent);font-weight:700;min-width:72px;}
.btn.primary:hover{opacity:.85;}
.btn.ic{padding:7px 9px;font-size:.95rem;}
.wpm-num{
  font-family:'Bebas Neue',cursive;font-size:1.5rem;
  color:var(--accent);min-width:48px;text-align:center;
}
input[type=range]{
  -webkit-appearance:none;width:100px;height:3px;
  background:var(--border);border-radius:2px;outline:none;
}
input[type=range]::-webkit-slider-thumb{
  -webkit-appearance:none;width:13px;height:13px;
  border-radius:50%;background:var(--accent);cursor:pointer;
}
.sep{width:1px;height:20px;background:var(--border);flex-shrink:0;}
.ml{margin-left:auto;}
.pill{
  font-family:'Space Mono',monospace;font-size:.55rem;letter-spacing:.14em;
  text-transform:uppercase;padding:3px 8px;border-radius:20px;
  border:1px solid var(--border);color:var(--muted);white-space:nowrap;
}
.pill.on{color:var(--accent);border-color:var(--accent);}

/* ══════════════════════════════════════════
   LUCIDE ICONS
══════════════════════════════════════════ */
.tbtn svg, .btn svg, #paste-btn svg,
.stats-again-btn svg, .jump-tip svg {
  width: 1em;
  height: 1em;
  stroke: currentColor;
  vertical-align: middle;
  display: inline-block;
  flex-shrink: 0;
}
.drop-icon svg { width: 2.6rem; height: 2.6rem; stroke: var(--muted); }

/* ══════════════════════════════════════════
   ERROR
══════════════════════════════════════════ */
.err{
  position:fixed;top:14px;left:50%;transform:translateX(-50%);
  background:#e33;color:#fff;padding:8px 16px;
  border-radius:var(--r);font-family:'Space Mono',monospace;
  font-size:.7rem;z-index:700;display:none;
}

/* ══════════════════════════════════════════
   MOBILE  ≤ 640px
══════════════════════════════════════════ */
@media(max-width:640px){
  :root{--bar-h:auto;--toolbar-h:52px;}

  #upload-screen{padding:20px 16px;gap:20px;}
  .drop-zone{padding:36px 18px;}
  .tagline{font-size:.62rem;margin-top:-18px;}

  .top-toolbar{top:8px;right:8px;gap:6px;}
  .tbtn{width:36px;height:36px;font-size:.9rem;}
  .settings-panel{right:8px;left:8px;width:auto;top:52px;}

  #reader-screen{flex-direction:column;}
  .toolbar-spacer{height:52px;}

  .reader-body{position:relative;flex:1;min-height:0;overflow:hidden;}

  .reader-word-area{
    position:absolute;inset:0;
    padding:16px 16px 10px;
    gap:12px;
  }
  #display-word{font-size:clamp(2.8rem,15vw,5.5rem);}

  .book-sidebar{
    position:absolute;
    left:0;right:0;bottom:0;
    width:100% !important;
    height:75%;
    border-right:none;
    border-top:1px solid var(--border);
    border-radius:14px 14px 0 0;
    z-index:100;
    transform:translateY(0);
    transition:transform var(--t);
  }
  .book-sidebar.collapsed{
    transform:translateY(105%);
    pointer-events:none;
  }

  .controls-bar{
    height:auto;
    flex-direction:column;
    padding:8px 10px;
    padding-bottom:max(8px, env(safe-area-inset-bottom));
    gap:6px;
    align-items:stretch;
    border-top:1px solid var(--border);
  }

  .mob-row1{
    display:flex;align-items:center;
    justify-content:space-between;gap:5px;
  }
  .mob-row2{
    display:flex;align-items:center;gap:8px;
  }

  .desk-only{display:none !important;}

  .btn{height:42px;padding:0 11px;font-size:.7rem;display:flex;align-items:center;justify-content:center;}
  .btn.ic{width:42px;padding:0;font-size:1rem;}
  .btn.primary{min-width:62px;}
  #close-btn{min-width:auto;}

  .wpm-num{font-size:1.2rem;min-width:42px;}
  .clabel{font-size:.52rem;}
  input[type=range]{flex:1;min-width:0;max-width:none;}
  .pill{font-size:.5rem;padding:2px 7px;}
  .ml{margin-left:auto;}
  .sep{display:none;}
}