*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}

:root{
  --bg-root:#08090d;
  --bg-surface:#0e1018;
  --bg-elevated:#141620;
  --bg-glass:rgba(18,20,32,.55);
  --border:rgba(255,255,255,.06);
  --border-focus:rgba(255,255,255,.14);
  --text-primary:#e8eaed;
  --text-secondary:#8b8fa3;
  --text-muted:#505368;
  --accent:#c4f84a;
  --accent-dim:rgba(196,248,74,.12);
  --accent-glow:rgba(196,248,74,.25);
  --danger:#ff5c5c;
  --warn:#ffb347;
  --good:#4af8a1;
  --radius:12px;
  --radius-sm:8px;
  --radius-xs:6px;
  --font-mono:'JetBrains Mono',monospace;
  --font-serif:'Instrument Serif',serif;
  --font-sans:'DM Sans',sans-serif;
  --transition:all .25s cubic-bezier(.4,0,.2,1);
}

/* ═══ LIGHT THEME (#11) ═══ */
[data-theme="light"]{
  --bg-root:#f5f5f7;
  --bg-surface:#ffffff;
  --bg-elevated:#ebedf0;
  --bg-glass:rgba(255,255,255,.75);
  --border:rgba(0,0,0,.08);
  --border-focus:rgba(0,0,0,.18);
  --text-primary:#1a1a2e;
  --text-secondary:#5a5d72;
  --text-muted:#8e91a4;
  --accent:#2d8f2d;
  --accent-dim:rgba(45,143,45,.1);
  --accent-glow:rgba(45,143,45,.2);
  --danger:#e53935;
  --warn:#ef6c00;
  --good:#2e7d32;
}
[data-theme="light"] body::before{
  background:
    radial-gradient(ellipse 80% 50% at 20% 10%,rgba(45,143,45,.04),transparent),
    radial-gradient(ellipse 60% 40% at 80% 90%,rgba(74,140,248,.03),transparent);
}
[data-theme="light"] body::after{opacity:.015}
[data-theme="light"] .header{background:rgba(245,245,247,.9)}
[data-theme="light"] .btn-humanize{color:#fff}
[data-theme="light"] .score-bar{background:rgba(0,0,0,.06)}
[data-theme="light"] .loading-overlay{background:rgba(245,245,247,.8)}
[data-theme="light"] .overlay-base{background:rgba(245,245,247,.95)}
[data-theme="light"] .toast{background:var(--bg-surface);box-shadow:0 8px 30px rgba(0,0,0,.12)}
[data-theme="light"] ::-webkit-scrollbar-thumb{background:rgba(0,0,0,.1)}
[data-theme="light"] ::-webkit-scrollbar-thumb:hover{background:rgba(0,0,0,.2)}

html{font-size:15px;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}
body{
  font-family:var(--font-sans);
  background:var(--bg-root);
  color:var(--text-primary);
  min-height:100vh;
  overflow-x:hidden;
}

/* ── Ambient background ── */
body::before{
  content:'';position:fixed;inset:0;z-index:0;
  background:
    radial-gradient(ellipse 80% 50% at 20% 10%,rgba(196,248,74,.04),transparent),
    radial-gradient(ellipse 60% 40% at 80% 90%,rgba(74,200,248,.03),transparent),
    radial-gradient(ellipse 50% 50% at 50% 50%,rgba(196,248,74,.015),transparent);
  pointer-events:none;
}

/* ── Noise overlay ── */
body::after{
  content:'';position:fixed;inset:0;z-index:0;
  opacity:.035;
  background-image:url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  background-size:128px;
  pointer-events:none;
}

.app{position:relative;z-index:1;min-height:100vh;display:flex;flex-direction:column}

/* ═══ HEADER ═══ */
.header{
  display:flex;align-items:center;justify-content:space-between;
  padding:16px 28px;
  border-bottom:1px solid var(--border);
  backdrop-filter:blur(20px);
  background:rgba(8,9,13,.8);
  position:sticky;top:0;z-index:100;
}
.logo{display:flex;align-items:center;gap:12px}
.logo-icon{
  width:36px;height:36px;
  background:var(--accent);
  border-radius:var(--radius-xs);
  display:grid;place-items:center;
  font-family:var(--font-mono);font-weight:700;font-size:14px;color:var(--bg-root);
  position:relative;
}
.logo-icon::after{
  content:'';position:absolute;inset:-2px;border-radius:8px;
  background:var(--accent);opacity:.2;filter:blur(8px);
}
.logo-text{font-family:var(--font-serif);font-size:1.5rem;letter-spacing:-.02em;font-style:italic;color:var(--text-primary)}
.logo-tag{
  font-family:var(--font-mono);font-size:.65rem;
  color:var(--accent);background:var(--accent-dim);
  padding:3px 8px;border-radius:20px;
  letter-spacing:.06em;text-transform:uppercase;
  margin-left:4px;
}

.header-actions{display:flex;align-items:center;gap:10px}
.btn-icon{
  width:38px;height:38px;border-radius:var(--radius-sm);
  border:1px solid var(--border);background:transparent;
  color:var(--text-secondary);cursor:pointer;
  display:grid;place-items:center;
  transition:var(--transition);
  font-size:18px;line-height:1;
}
.btn-icon:hover{border-color:var(--border-focus);color:var(--text-primary);background:var(--bg-elevated)}
.btn-icon svg{width:18px;height:18px}

/* ═══ API KEY DRAWER ═══ */
.api-drawer{
  overflow:hidden;max-height:0;transition:max-height .35s cubic-bezier(.4,0,.2,1);
  border-bottom:1px solid transparent;
}
.api-drawer.open{max-height:280px;border-bottom-color:var(--border)}
.api-drawer-inner{
  padding:16px 28px;display:flex;align-items:flex-end;gap:14px;flex-wrap:wrap;
  background:var(--bg-surface);
}
.api-drawer-inner label{font-family:var(--font-mono);font-size:.68rem;color:var(--text-secondary);white-space:nowrap;letter-spacing:.03em;display:block;margin-bottom:4px}
.api-provider-section{min-width:140px}
.api-key-section{flex:1;min-width:200px}
.api-input-wrap{flex:1;position:relative}
.api-input-wrap input{
  width:100%;padding:10px 44px 10px 14px;
  background:var(--bg-elevated);border:1px solid var(--border);border-radius:var(--radius-sm);
  color:var(--text-primary);font-family:var(--font-mono);font-size:.8rem;
  outline:none;transition:var(--transition);
}
.api-input-wrap input:focus{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-dim)}
.api-input-wrap input::placeholder{color:var(--text-muted)}
.api-toggle-vis{
  position:absolute;right:8px;top:50%;transform:translateY(-50%);
  background:none;border:none;color:var(--text-muted);cursor:pointer;padding:4px;
}
.api-toggle-vis:hover{color:var(--text-secondary)}
.api-toggle-vis svg{width:16px;height:16px}
.api-status{
  font-family:var(--font-mono);font-size:.7rem;
  padding:4px 10px;border-radius:20px;white-space:nowrap;
}
.api-status.saved{color:var(--good);background:rgba(74,248,161,.1)}
.api-status.missing{color:var(--warn);background:rgba(255,179,71,.1)}

.api-drawer-info{
  padding:6px 28px 8px;display:flex;align-items:center;gap:8px;
  font-family:var(--font-mono);font-size:.62rem;color:var(--text-muted);
  background:var(--bg-surface);
}
.api-drawer-options{
  padding:0 28px 8px;display:flex;gap:8px;background:var(--bg-surface);
}
.api-drawer-detector{
  padding:8px 28px 14px;background:var(--bg-surface);
  border-top:1px solid var(--border);
}
.api-drawer-detector label{font-family:var(--font-mono);font-size:.68rem;color:var(--text-secondary);display:block;margin-bottom:6px}
.api-detector-input{
  flex:1;padding:8px 12px;
  background:var(--bg-elevated);border:1px solid var(--border);border-radius:var(--radius-sm);
  color:var(--text-primary);font-family:var(--font-mono);font-size:.75rem;
  outline:none;transition:var(--transition);
}
.api-detector-input:focus{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-dim)}

/* ═══ WORKSPACE ═══ */
.workspace{
  flex:1;display:grid;
  grid-template-columns:1fr auto 1fr;
  gap:0;padding:0;
  overflow:hidden;
}

.panel{display:flex;flex-direction:column;min-height:calc(100vh - 180px)}
.panel-header{
  display:flex;align-items:center;justify-content:space-between;
  padding:16px 24px;
  border-bottom:1px solid var(--border);
  background:var(--bg-surface);
}
.panel-title{
  font-family:var(--font-mono);font-size:.75rem;
  letter-spacing:.08em;text-transform:uppercase;
  color:var(--text-secondary);
  display:flex;align-items:center;gap:8px;
}
.panel-title .dot{width:7px;height:7px;border-radius:50%}
.panel-title .dot.input-dot{background:var(--accent)}
.panel-title .dot.output-dot{background:#4ac8f8}
.panel-stats{
  font-family:var(--font-mono);font-size:.7rem;color:var(--text-muted);
  display:flex;gap:14px;
}
.panel-stats span{display:flex;align-items:center;gap:4px}

.text-area-wrap{flex:1;position:relative}
.text-area-wrap textarea{
  width:100%;height:100%;resize:none;
  padding:24px;
  background:transparent;
  border:none;outline:none;
  color:var(--text-primary);
  font-family:var(--font-sans);font-size:.95rem;line-height:1.75;
  letter-spacing:.01em;
}
.text-area-wrap textarea::placeholder{color:var(--text-muted);font-style:italic}
.output-text{
  padding:24px;
  font-family:var(--font-sans);font-size:.95rem;line-height:1.75;
  letter-spacing:.01em;
  overflow-y:auto;flex:1;
  white-space:pre-wrap;
  min-height:300px;
}
.output-text.empty{color:var(--text-muted);font-style:italic;display:flex;align-items:center;justify-content:center;text-align:center}

.panel-footer{
  display:flex;align-items:center;justify-content:flex-end;gap:8px;
  padding:10px 20px;border-top:1px solid var(--border);
  background:var(--bg-surface);
}
.btn-sm{
  padding:6px 14px;border-radius:var(--radius-xs);
  border:1px solid var(--border);background:transparent;
  color:var(--text-secondary);font-family:var(--font-mono);font-size:.7rem;
  cursor:pointer;transition:var(--transition);
  display:flex;align-items:center;gap:5px;
  letter-spacing:.03em;white-space:nowrap;
}
.btn-sm:hover{border-color:var(--border-focus);color:var(--text-primary);background:var(--bg-elevated)}
.btn-sm svg{width:13px;height:13px}
.btn-sm.copied{color:var(--good);border-color:rgba(74,248,161,.3)}

/* ═══ CENTER CONTROLS ═══ */
.controls{
  width:280px;
  border-left:1px solid var(--border);
  border-right:1px solid var(--border);
  background:var(--bg-surface);
  display:flex;flex-direction:column;
  overflow-y:auto;
}

/* Tab system */
.ctrl-tabs{
  display:flex;border-bottom:1px solid var(--border);
  background:var(--bg-elevated);
}
.ctrl-tab{
  flex:1;padding:10px;
  font-family:var(--font-mono);font-size:.7rem;
  letter-spacing:.06em;text-transform:uppercase;
  color:var(--text-muted);
  background:transparent;border:none;cursor:pointer;
  transition:var(--transition);
  border-bottom:2px solid transparent;
}
.ctrl-tab:hover{color:var(--text-secondary)}
.ctrl-tab.active{color:var(--accent);border-bottom-color:var(--accent)}

.ctrl-section{padding:20px;border-bottom:1px solid var(--border)}
.ctrl-section:last-child{border-bottom:none}
.ctrl-label{
  font-family:var(--font-mono);font-size:.68rem;
  letter-spacing:.1em;text-transform:uppercase;
  color:var(--text-muted);margin-bottom:10px;
  display:block;
}
.ctrl-select{
  width:100%;padding:10px 12px;
  background:var(--bg-elevated);border:1px solid var(--border);border-radius:var(--radius-sm);
  color:var(--text-primary);font-family:var(--font-sans);font-size:.85rem;
  outline:none;cursor:pointer;transition:var(--transition);
  appearance:none;
  background-image:url("data:image/svg+xml,%3Csvg width='12' height='8' viewBox='0 0 12 8' fill='none' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M1 1.5L6 6.5L11 1.5' stroke='%23505368' stroke-width='1.5' stroke-linecap='round'/%3E%3C/svg%3E");
  background-repeat:no-repeat;
  background-position:right 12px center;
}
.ctrl-select:focus{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-dim)}
.ctrl-select option{background:var(--bg-elevated);color:var(--text-primary)}
.ctrl-select-sm{padding:7px 10px;font-size:.78rem}

.model-hint{
  margin-top:6px;font-family:var(--font-mono);font-size:.58rem;
  color:var(--text-muted);line-height:1.4;
}

/* Toggle labels */
.ctrl-toggle{
  display:flex;align-items:center;gap:6px;
  font-family:var(--font-mono);font-size:.68rem;
  color:var(--text-secondary);cursor:pointer;
}
.ctrl-toggle input{accent-color:var(--accent)}

/* Custom instructions textarea */
.ctrl-textarea{
  width:100%;min-height:80px;resize:vertical;
  padding:10px 12px;margin-bottom:8px;
  background:var(--bg-elevated);border:1px solid var(--border);border-radius:var(--radius-sm);
  color:var(--text-primary);font-family:var(--font-sans);font-size:.82rem;line-height:1.5;
  outline:none;transition:var(--transition);
}
.ctrl-textarea:focus{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-dim)}
.ctrl-textarea::placeholder{color:var(--text-muted);font-style:italic}

/* Template actions */
.template-actions{display:flex;gap:8px;align-items:center}

/* Selection info */
.selection-info{
  margin-top:6px;font-family:var(--font-mono);font-size:.62rem;
  color:var(--accent);min-height:1em;
}

/* Length slider */
.length-slider{
  display:flex;align-items:center;gap:8px;margin-top:8px;
}
.length-end{font-family:var(--font-mono);font-size:.6rem;color:var(--text-muted);white-space:nowrap}
.length-range{
  -webkit-appearance:none;flex:1;height:6px;
  background:var(--bg-elevated);border-radius:3px;cursor:pointer;
}
.length-range::-webkit-slider-thumb{
  -webkit-appearance:none;width:16px;height:16px;border-radius:50%;
  background:var(--accent);border:3px solid var(--bg-surface);cursor:pointer;
}
.length-label{
  text-align:center;margin-top:6px;
  font-family:var(--font-mono);font-size:.65rem;color:var(--text-secondary);
}

/* Intensity Slider */
.intensity-track{
  position:relative;height:6px;
  background:var(--bg-elevated);border-radius:3px;
  margin-top:14px;margin-bottom:8px;cursor:pointer;
}
.intensity-fill{
  position:absolute;left:0;top:0;height:100%;
  border-radius:3px;
  background:linear-gradient(90deg,var(--good),var(--accent),var(--warn));
  transition:width .2s ease;pointer-events:none;
}
.intensity-thumb{
  position:absolute;top:50%;transform:translate(-50%,-50%);
  width:18px;height:18px;border-radius:50%;
  background:var(--text-primary);
  border:3px solid var(--bg-surface);
  box-shadow:0 2px 8px rgba(0,0,0,.4);
  transition:left .2s ease;pointer-events:none;
}
.intensity-labels{
  display:flex;justify-content:space-between;
  font-family:var(--font-mono);font-size:.65rem;color:var(--text-muted);
}
.intensity-labels span{cursor:pointer;padding:2px 0;transition:var(--transition)}
.intensity-labels span:hover{color:var(--text-secondary)}
.intensity-labels span.active{color:var(--accent)}

input[type="range"]{
  -webkit-appearance:none;width:100%;height:6px;
  background:transparent;position:absolute;top:0;left:0;
  margin:0;cursor:pointer;opacity:0;z-index:2;
}

/* Humanize Button */
.btn-humanize{
  width:100%;padding:14px;
  background:var(--accent);color:var(--bg-root);
  border:none;border-radius:var(--radius-sm);
  font-family:var(--font-mono);font-size:.85rem;font-weight:600;
  letter-spacing:.04em;text-transform:uppercase;
  cursor:pointer;transition:var(--transition);
  position:relative;overflow:hidden;
}
.btn-humanize:hover{
  box-shadow:0 0 30px var(--accent-glow),0 4px 20px rgba(0,0,0,.3);
  transform:translateY(-1px);
}
.btn-humanize:active{transform:translateY(0)}
.btn-humanize:disabled{opacity:.5;cursor:not-allowed;transform:none;box-shadow:none}
.btn-humanize .btn-text{position:relative;z-index:1}
.btn-humanize .spinner{display:none;position:relative;z-index:1}
.btn-humanize.loading .btn-text{display:none}
.btn-humanize.loading .spinner{display:inline-flex;align-items:center;gap:8px}

@keyframes spin{to{transform:rotate(360deg)}}
.spin-icon{
  width:16px;height:16px;border:2px solid rgba(8,9,13,.3);
  border-top-color:var(--bg-root);border-radius:50%;
  animation:spin .6s linear infinite;
}

/* ═══ TONE ANALYSIS (#9) ═══ */
.tone-analysis{
  padding:10px 20px;
  border-top:1px solid var(--border);
  background:var(--bg-surface);
}
.tone-header{
  display:flex;align-items:center;justify-content:space-between;margin-bottom:6px;
}
.tone-title{
  font-family:var(--font-mono);font-size:.68rem;
  letter-spacing:.06em;text-transform:uppercase;
  color:var(--text-muted);
}
.tone-metrics{
  display:flex;gap:12px;flex-wrap:wrap;
  font-family:var(--font-mono);font-size:.65rem;color:var(--text-secondary);
}
.tone-suggestion{
  font-family:var(--font-mono);font-size:.6rem;color:var(--accent);
  margin-top:4px;min-height:1em;
}

/* ═══ SCORE CARDS ═══ */
.scores-section{padding:20px}
.score-card{
  background:var(--bg-elevated);
  border:1px solid var(--border);
  border-radius:var(--radius-sm);
  padding:14px 16px;
  margin-bottom:10px;
}
.score-card:last-child{margin-bottom:0}
.score-card-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:10px}
.score-card-title{
  font-family:var(--font-mono);font-size:.7rem;
  letter-spacing:.06em;text-transform:uppercase;
  color:var(--text-secondary);
}
.score-value{font-family:var(--font-mono);font-size:1.1rem;font-weight:700}
.score-bar{height:4px;background:rgba(255,255,255,.06);border-radius:2px;overflow:hidden}
.score-bar-fill{height:100%;border-radius:2px;transition:width .8s cubic-bezier(.4,0,.2,1)}
.score-detail{
  display:flex;justify-content:space-between;
  margin-top:8px;
  font-family:var(--font-mono);font-size:.62rem;color:var(--text-muted);
}

.detector-score{border-color:rgba(74,200,248,.2)}

.score-legend{
  display:flex;align-items:center;gap:12px;
  padding:10px 0 0;
  font-family:var(--font-mono);font-size:.6rem;color:var(--text-muted);
}
.score-legend span{display:flex;align-items:center;gap:4px}
.score-legend .leg-dot{width:6px;height:6px;border-radius:50%}

/* ═══ EXPORT DROPDOWN (#12) ═══ */
.export-dropdown{position:relative;display:inline-block}
.export-menu{
  display:none;
  position:absolute;bottom:100%;right:0;
  margin-bottom:6px;
  background:var(--bg-elevated);border:1px solid var(--border);
  border-radius:var(--radius-sm);
  box-shadow:0 8px 30px rgba(0,0,0,.3);
  overflow:hidden;min-width:180px;z-index:50;
}
.export-dropdown.open .export-menu{display:block}
.export-option{
  display:block;width:100%;padding:10px 16px;
  background:transparent;border:none;
  color:var(--text-secondary);
  font-family:var(--font-mono);font-size:.72rem;
  text-align:left;cursor:pointer;transition:var(--transition);
}
.export-option:hover{background:var(--bg-surface);color:var(--text-primary)}
.export-option+.export-option{border-top:1px solid var(--border)}

/* ═══ LOADING OVERLAY ═══ */
.loading-overlay{
  display:none;
  position:absolute;inset:0;
  background:rgba(8,9,13,.7);
  backdrop-filter:blur(4px);
  z-index:10;
  flex-direction:column;align-items:center;justify-content:center;gap:16px;
}
.loading-overlay.visible{display:flex}
.loading-bar{width:200px;height:3px;background:rgba(255,255,255,.06);border-radius:2px;overflow:hidden}
@keyframes loadProgress{
  0%{transform:translateX(-100%)}
  50%{transform:translateX(0%)}
  100%{transform:translateX(100%)}
}
.loading-bar-inner{
  width:50%;height:100%;
  background:linear-gradient(90deg,transparent,var(--accent),transparent);
  animation:loadProgress 1.5s ease-in-out infinite;
}
.loading-text{font-family:var(--font-mono);font-size:.75rem;color:var(--text-secondary);text-align:center}

/* ═══ OVERLAY BASE ═══ */
.overlay-base{
  display:none;position:fixed;inset:0;z-index:200;
  background:rgba(8,9,13,.92);backdrop-filter:blur(12px);
  padding:40px;overflow-y:auto;
}
.overlay-base.visible{display:block}
.overlay-close{
  position:fixed;top:20px;right:24px;z-index:201;
  width:40px;height:40px;border-radius:50%;
  background:var(--bg-elevated);border:1px solid var(--border);
  color:var(--text-secondary);cursor:pointer;
  display:grid;place-items:center;transition:var(--transition);
}
.overlay-close:hover{color:var(--text-primary);border-color:var(--border-focus)}
.overlay-close svg{width:18px;height:18px}
.overlay-title{
  font-family:var(--font-serif);font-size:2rem;font-style:italic;
  text-align:center;margin-bottom:30px;color:var(--text-primary);
}

/* ═══ COMPARISON OVERLAY (#4) ═══ */
.comparison-grid{display:grid;grid-template-columns:1fr 1fr;gap:24px;max-width:1200px;margin:0 auto}
.comparison-col{
  background:var(--bg-surface);border:1px solid var(--border);
  border-radius:var(--radius);overflow:hidden;
}
.comparison-col-header{
  padding:14px 20px;border-bottom:1px solid var(--border);
  font-family:var(--font-mono);font-size:.75rem;
  letter-spacing:.08em;text-transform:uppercase;
  color:var(--text-secondary);
  display:flex;align-items:center;gap:8px;
}
.comparison-col-header .dot{width:7px;height:7px;border-radius:50%}
.comparison-col-body{
  padding:24px;font-family:var(--font-sans);font-size:.92rem;
  line-height:1.75;white-space:pre-wrap;
  max-height:60vh;overflow-y:auto;
}

/* Diff toolbar */
.diff-toolbar{
  display:flex;align-items:center;gap:12px;
  max-width:1200px;margin:0 auto 20px;
}
.diff-tab{
  padding:6px 16px;border-radius:var(--radius-xs);
  border:1px solid var(--border);background:transparent;
  color:var(--text-muted);font-family:var(--font-mono);font-size:.7rem;
  cursor:pointer;transition:var(--transition);
}
.diff-tab:hover{border-color:var(--border-focus);color:var(--text-secondary)}
.diff-tab.active{border-color:var(--accent);color:var(--accent);background:var(--accent-dim)}

.diff-stats{
  margin-left:auto;
  font-family:var(--font-mono);font-size:.65rem;color:var(--text-muted);
}

.diff-inline-view{
  max-width:1200px;margin:0 auto;
  background:var(--bg-surface);border:1px solid var(--border);
  border-radius:var(--radius);padding:24px;
  font-family:var(--font-sans);font-size:.92rem;line-height:1.75;
  white-space:pre-wrap;max-height:70vh;overflow-y:auto;
}

.diff-added{background:rgba(74,248,161,.15);border-radius:2px;padding:0 2px}
.diff-removed{background:rgba(255,92,92,.15);border-radius:2px;padding:0 2px;text-decoration:line-through;opacity:.7}
.diff-ai-tell{background:rgba(255,179,71,.2);border-radius:2px;padding:0 2px;border-bottom:1px dashed var(--warn)}

/* ═══ HISTORY OVERLAY (#2) ═══ */
.history-toolbar{
  display:flex;align-items:center;gap:10px;
  max-width:800px;margin:0 auto 20px;
}
.history-search{
  flex:1;padding:10px 14px;
  background:var(--bg-elevated);border:1px solid var(--border);border-radius:var(--radius-sm);
  color:var(--text-primary);font-family:var(--font-sans);font-size:.85rem;
  outline:none;transition:var(--transition);
}
.history-search:focus{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-dim)}
.history-search::placeholder{color:var(--text-muted)}

.history-list{max-width:800px;margin:0 auto}

.history-item{
  background:var(--bg-surface);border:1px solid var(--border);
  border-radius:var(--radius-sm);padding:16px 20px;margin-bottom:10px;
  transition:var(--transition);
}
.history-item:hover{border-color:var(--border-focus)}
.history-item-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:6px}
.history-item-date{font-family:var(--font-mono);font-size:.68rem;color:var(--text-muted)}
.history-item-meta{
  display:flex;gap:10px;
  font-family:var(--font-mono);font-size:.62rem;color:var(--text-secondary);
}
.history-item-meta span{
  background:var(--bg-elevated);padding:2px 8px;border-radius:10px;
}
.history-item-preview{
  font-family:var(--font-sans);font-size:.82rem;color:var(--text-secondary);
  line-height:1.5;margin-bottom:10px;
  overflow:hidden;white-space:nowrap;text-overflow:ellipsis;
}
.history-item-actions{display:flex;gap:6px}

/* ═══ BATCH OVERLAY (#1) ═══ */
.batch-container{max-width:800px;margin:0 auto}
.batch-textarea{
  width:100%;min-height:200px;resize:vertical;
  padding:16px;margin-bottom:10px;
  background:var(--bg-elevated);border:1px solid var(--border);border-radius:var(--radius-sm);
  color:var(--text-primary);font-family:var(--font-sans);font-size:.88rem;line-height:1.6;
  outline:none;transition:var(--transition);
}
.batch-textarea:focus{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-dim)}
.batch-textarea::placeholder{color:var(--text-muted);font-style:italic}
.batch-file-row{margin-bottom:16px}
.batch-file-label{cursor:pointer}
.batch-controls{display:flex;align-items:center;gap:10px;margin-bottom:16px}
.batch-progress-bar{
  height:4px;background:var(--bg-elevated);border-radius:2px;margin-bottom:8px;overflow:hidden;
}
.batch-progress-fill{
  height:100%;background:var(--accent);border-radius:2px;
  transition:width .3s ease;
}
.batch-progress-info{
  display:flex;justify-content:space-between;
  font-family:var(--font-mono);font-size:.65rem;color:var(--text-muted);
  margin-bottom:16px;
}
.batch-queue{max-height:300px;overflow-y:auto}
.batch-item{
  display:flex;align-items:center;gap:10px;
  padding:8px 12px;border-bottom:1px solid var(--border);
  font-family:var(--font-mono);font-size:.7rem;
}
.batch-item-num{color:var(--text-muted);min-width:30px}
.batch-item-preview{flex:1;color:var(--text-secondary);overflow:hidden;white-space:nowrap;text-overflow:ellipsis}
.batch-item-status{min-width:80px;text-align:right}
.batch-done .batch-item-status{color:var(--good)}
.batch-error .batch-item-status{color:var(--danger)}
.batch-processing .batch-item-status{color:var(--accent)}
.batch-pending .batch-item-status{color:var(--text-muted)}

/* ═══ STATS OVERLAY (#14) ═══ */
.stats-grid{
  display:grid;grid-template-columns:repeat(4,1fr);gap:16px;
  max-width:800px;margin:0 auto 24px;
}
.stat-card{
  background:var(--bg-surface);border:1px solid var(--border);
  border-radius:var(--radius-sm);padding:20px;text-align:center;
}
.stat-value{
  font-family:var(--font-mono);font-size:1.5rem;font-weight:700;
  color:var(--accent);margin-bottom:4px;
}
.stat-label{
  font-family:var(--font-mono);font-size:.65rem;
  color:var(--text-muted);text-transform:uppercase;letter-spacing:.06em;
}
.stats-chart-area{
  max-width:800px;margin:0 auto 20px;
  background:var(--bg-surface);border:1px solid var(--border);
  border-radius:var(--radius-sm);padding:20px;
}
.stats-chart-area canvas{width:100%;height:220px}
.stats-breakdown{
  max-width:800px;margin:0 auto;
  font-family:var(--font-mono);font-size:.72rem;color:var(--text-secondary);
  display:flex;flex-direction:column;gap:6px;
}
.stats-breakdown-label{color:var(--text-muted);text-transform:uppercase;font-size:.62rem}

/* ═══ A/B TEST OVERLAY (#10) ═══ */
.ab-model-selects{
  display:flex;align-items:flex-end;gap:16px;
  max-width:700px;margin:0 auto 20px;
}
.ab-model-group{flex:1}
.ab-vs{
  font-family:var(--font-serif);font-size:1.5rem;font-style:italic;
  color:var(--text-muted);padding-bottom:8px;
}
.ab-results{
  display:grid;grid-template-columns:1fr 1fr;gap:20px;
  max-width:1100px;margin:0 auto;
}
.ab-result-col{
  background:var(--bg-surface);border:1px solid var(--border);
  border-radius:var(--radius);overflow:hidden;
  display:flex;flex-direction:column;
}
.ab-result-header{
  padding:14px 20px;border-bottom:1px solid var(--border);
  font-family:var(--font-mono);font-size:.75rem;
  letter-spacing:.06em;text-transform:uppercase;
  color:var(--text-secondary);
  display:flex;align-items:center;justify-content:space-between;
}
.ab-score{
  font-weight:700;color:var(--accent);
}
.ab-result-body{
  padding:20px;font-family:var(--font-sans);font-size:.88rem;
  line-height:1.7;white-space:pre-wrap;
  max-height:50vh;overflow-y:auto;flex:1;
  color:var(--text-secondary);
}
.ab-pick{
  margin:12px 20px;align-self:flex-start;
  color:var(--good);border-color:rgba(74,248,161,.3);
}
.ab-pick:hover{background:rgba(74,248,161,.08)}

/* ═══ TOAST ═══ */
.toast{
  position:fixed;bottom:30px;left:50%;transform:translateX(-50%) translateY(80px);
  padding:12px 24px;border-radius:var(--radius);
  background:var(--bg-elevated);border:1px solid var(--border);
  font-family:var(--font-mono);font-size:.8rem;color:var(--text-primary);
  box-shadow:0 12px 40px rgba(0,0,0,.5);
  transition:transform .35s cubic-bezier(.4,0,.2,1),opacity .35s;
  opacity:0;z-index:999;
  display:flex;align-items:center;gap:8px;
  max-width:500px;
}
.toast.show{transform:translateX(-50%) translateY(0);opacity:1}
.toast .toast-icon{color:var(--accent)}

/* ═══ RESPONSIVE ═══ */
@media(max-width:1100px){
  .workspace{grid-template-columns:1fr;grid-template-rows:auto auto auto}
  .controls{
    width:100%;
    flex-direction:row;flex-wrap:wrap;
    border-left:none;border-right:none;
    border-top:1px solid var(--border);
    border-bottom:1px solid var(--border);
  }
  .ctrl-tabs{width:100%}
  .ctrl-tab-content{width:100%;display:flex;flex-wrap:wrap}
  .ctrl-section{flex:1;min-width:200px;border-bottom:none;border-right:1px solid var(--border)}
  .ctrl-section:last-child{border-right:none}
  .panel{min-height:350px}
  .scores-section{flex-direction:row;display:flex;gap:10px;flex-wrap:wrap;width:100%}
  .score-card{flex:1;min-width:180px;margin-bottom:0}
  .stats-grid{grid-template-columns:repeat(2,1fr)}
  .ab-results{grid-template-columns:1fr}
  .ab-model-selects{flex-direction:column;align-items:stretch}
  .ab-vs{text-align:center}
}
@media(max-width:700px){
  .header{padding:12px 16px}
  .header-actions{gap:6px}
  .logo-text{font-size:1.2rem}
  .logo-tag{display:none}
  .ctrl-section{padding:14px}
  .comparison-grid{grid-template-columns:1fr}
  .overlay-base{padding:20px}
  .overlay-title{font-size:1.5rem}
  .stats-grid{grid-template-columns:1fr 1fr}
  .btn-icon{width:34px;height:34px}
  .btn-icon svg{width:16px;height:16px}
}

/* ── Scrollbar ── */
::-webkit-scrollbar{width:6px;height:6px}
::-webkit-scrollbar-track{background:transparent}
::-webkit-scrollbar-thumb{background:rgba(255,255,255,.08);border-radius:3px}
::-webkit-scrollbar-thumb:hover{background:rgba(255,255,255,.14)}

/* ── Entry animations ── */
@keyframes fadeUp{
  from{opacity:0;transform:translateY(12px)}
  to{opacity:1;transform:translateY(0)}
}
.panel,.controls{animation:fadeUp .5s cubic-bezier(.4,0,.2,1) both}
.controls{animation-delay:.1s}
.panel:last-of-type{animation-delay:.2s}

/* ═══ USER MENU ═══ */
.user-menu{position:relative;display:inline-flex}
.user-avatar{
  font-family:var(--font-mono);font-size:.8rem;font-weight:700;
  color:var(--bg-root);background:var(--accent);
  border-color:var(--accent);
}
.user-avatar:hover{background:var(--accent);border-color:var(--accent);opacity:.9}
.user-dropdown{
  display:none;position:absolute;top:calc(100% + 8px);right:0;
  min-width:220px;
  background:var(--bg-elevated);border:1px solid var(--border);
  border-radius:var(--radius-sm);
  box-shadow:0 12px 40px rgba(0,0,0,.4);
  z-index:120;overflow:hidden;
  animation:fadeUp .2s ease both;
}
.user-dropdown.open{display:block}
.user-dropdown-email{
  padding:12px 16px 4px;
  font-family:var(--font-mono);font-size:.7rem;
  color:var(--text-muted);
  white-space:nowrap;overflow:hidden;text-overflow:ellipsis;
}
.user-dropdown-tier{
  padding:0 16px 8px;
  font-family:var(--font-mono);font-size:.62rem;font-weight:600;
  letter-spacing:.08em;text-transform:uppercase;
}
.user-dropdown-tier.tier-free{color:var(--text-muted)}
.user-dropdown-tier.tier-pro{color:var(--accent)}
.user-dropdown-tier.tier-agency{color:#c084fc}
.user-dropdown-usage{
  padding:4px 16px 10px;
  font-family:var(--font-mono);font-size:.65rem;
  color:var(--text-secondary);
  border-bottom:1px solid var(--border);
}
.user-dropdown-item{
  display:block;width:100%;padding:10px 16px;
  background:transparent;border:none;
  color:var(--text-secondary);
  font-family:var(--font-mono);font-size:.72rem;
  text-align:left;cursor:pointer;transition:var(--transition);
}
.user-dropdown-item:hover{background:var(--bg-surface);color:var(--text-primary)}
.user-dropdown-item+.user-dropdown-item{border-top:1px solid var(--border)}

/* ═══ AUTH MODAL ═══ */
.auth-overlay{display:none;align-items:center;justify-content:center}
.auth-overlay.visible{display:flex}
.auth-modal{
  width:100%;max-width:400px;
  background:var(--bg-surface);
  border:1px solid var(--border);
  border-radius:var(--radius);
  padding:40px 32px;
  position:relative;
  box-shadow:0 24px 80px rgba(0,0,0,.4);
  animation:fadeUp .3s ease both;
}
.auth-modal-title{
  font-family:var(--font-serif);font-size:1.5rem;font-style:italic;
  text-align:center;margin-bottom:28px;color:var(--text-primary);
}
.auth-google-btn{
  width:100%;padding:12px;
  display:flex;align-items:center;justify-content:center;gap:10px;
  background:var(--bg-elevated);
  border:1px solid var(--border);border-radius:var(--radius-sm);
  color:var(--text-primary);
  font-family:var(--font-sans);font-size:.88rem;font-weight:500;
  cursor:pointer;transition:var(--transition);
}
.auth-google-btn:hover{border-color:var(--border-focus);background:var(--bg-glass)}
.auth-divider{
  display:flex;align-items:center;gap:12px;
  margin:20px 0;
  font-family:var(--font-mono);font-size:.65rem;
  color:var(--text-muted);letter-spacing:.06em;text-transform:uppercase;
}
.auth-divider::before,.auth-divider::after{
  content:'';flex:1;height:1px;background:var(--border);
}
.auth-form{display:flex;flex-direction:column;gap:12px}
.auth-form input{
  width:100%;padding:11px 14px;
  background:var(--bg-elevated);border:1px solid var(--border);border-radius:var(--radius-sm);
  color:var(--text-primary);font-family:var(--font-sans);font-size:.88rem;
  outline:none;transition:var(--transition);
}
.auth-form input:focus{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-dim)}
.auth-form input::placeholder{color:var(--text-muted)}
.auth-form .btn-humanize{margin-top:4px}
.auth-toggle{
  display:flex;align-items:center;justify-content:center;gap:8px;
  margin-top:18px;
  font-family:var(--font-mono);font-size:.72rem;
  color:var(--text-muted);
}
.auth-toggle .btn-sm{border:none;color:var(--accent);padding:4px 8px;font-size:.72rem}
.auth-toggle .btn-sm:hover{text-decoration:underline;background:transparent}

/* ═══ PRICING OVERLAY ═══ */
.pricing-grid{
  display:grid;grid-template-columns:repeat(3,1fr);gap:20px;
  max-width:900px;margin:0 auto;
}
.pricing-card{
  background:var(--bg-surface);border:1px solid var(--border);
  border-radius:var(--radius);padding:32px 24px;
  text-align:center;transition:var(--transition);
  display:flex;flex-direction:column;
}
.pricing-card:hover{border-color:var(--border-focus);transform:translateY(-2px)}
.pricing-card-highlight{
  border-color:var(--accent);
  box-shadow:0 0 40px var(--accent-dim);
  position:relative;
}
.pricing-card-highlight::before{
  content:'POPULAR';position:absolute;top:-12px;left:50%;transform:translateX(-50%);
  background:var(--accent);color:var(--bg-root);
  font-family:var(--font-mono);font-size:.6rem;font-weight:700;
  letter-spacing:.1em;padding:4px 14px;border-radius:20px;
}
.pricing-tier{
  font-family:var(--font-mono);font-size:.8rem;font-weight:600;
  letter-spacing:.1em;text-transform:uppercase;
  color:var(--text-secondary);margin-bottom:8px;
}
.pricing-price{
  font-family:var(--font-serif);font-size:2.5rem;font-style:italic;
  color:var(--text-primary);margin-bottom:20px;
}
.pricing-price span{font-size:.9rem;color:var(--text-muted);font-style:normal;font-family:var(--font-sans)}
.pricing-features{
  list-style:none;text-align:left;margin-bottom:24px;flex:1;
  font-family:var(--font-sans);font-size:.85rem;color:var(--text-secondary);
}
.pricing-features li{
  padding:6px 0;
  border-bottom:1px solid var(--border);
}
.pricing-features li::before{
  content:'\2713 ';color:var(--accent);font-weight:700;margin-right:6px;
}
.pricing-features li:last-child{border-bottom:none}
.pricing-current{
  font-family:var(--font-mono);font-size:.72rem;
  color:var(--text-muted);padding:12px;
  letter-spacing:.04em;
}
.pricing-card .btn-humanize{font-size:.78rem;padding:12px}

@media(max-width:700px){
  .pricing-grid{grid-template-columns:1fr}
  .auth-modal{padding:28px 20px;margin:0 12px}
}

/* ═══ SEO CONTENT SECTION ═══ */
.seo-content{
  max-width:800px;
  margin:60px auto 0;
  padding:48px 24px;
  border-top:1px solid var(--border);
  font-family:var(--font-sans);
  color:var(--text-secondary);
  line-height:1.7;
}
.seo-content h1{
  font-family:var(--font-serif);
  font-size:2rem;
  font-style:italic;
  color:var(--text-primary);
  margin-bottom:16px;
  line-height:1.3;
}
.seo-content h2{
  font-family:var(--font-mono);
  font-size:.85rem;
  font-weight:600;
  letter-spacing:.06em;
  text-transform:uppercase;
  color:var(--accent);
  margin:36px 0 12px;
}
.seo-content p{
  font-size:.9rem;
  margin-bottom:16px;
}
.seo-features{
  list-style:none;
  padding:0;
  margin:0 0 16px;
}
.seo-features li{
  font-size:.85rem;
  padding:8px 0;
  border-bottom:1px solid var(--border);
}
.seo-features li:last-child{border-bottom:none}
.seo-features li strong{color:var(--text-primary)}
.seo-faq{margin-top:8px}
.seo-faq details{
  border:1px solid var(--border);
  border-radius:var(--radius-sm);
  margin-bottom:8px;
  overflow:hidden;
}
.seo-faq summary{
  font-family:var(--font-sans);
  font-size:.88rem;
  font-weight:500;
  color:var(--text-primary);
  padding:14px 16px;
  cursor:pointer;
  list-style:none;
  display:flex;
  align-items:center;
  gap:10px;
}
.seo-faq summary::before{
  content:'+';
  font-family:var(--font-mono);
  font-size:1rem;
  color:var(--accent);
  flex-shrink:0;
}
.seo-faq details[open] summary::before{content:'\2212'}
.seo-faq details p{
  padding:0 16px 14px;
  font-size:.84rem;
  margin:0;
}