:root{
  --bg:#0b1020;
  --panel:#0f172a;
  --panel2:#111c33;
  --text:#e5e7eb;
  --muted:#94a3b8;
  --border:rgba(148,163,184,.18);
  --accent:#22c55e;
  --accent2:#16a34a;
  --shadow: 0 20px 60px rgba(0,0,0,.35);
  --radius:14px;
  --mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  --sans: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji","Segoe UI Emoji";
}

*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;
  font-family:var(--sans);
  color:var(--text);
  background:
    radial-gradient(900px 400px at 10% 0%, rgba(34,197,94,.22), transparent 60%),
    radial-gradient(900px 400px at 90% 0%, rgba(59,130,246,.14), transparent 55%),
    var(--bg);
}

.topbar{
  display:flex;
  align-items:center;
  justify-content:space-between;
  padding:16px 18px;
  border-bottom:1px solid var(--border);
  background:linear-gradient(180deg, rgba(15,23,42,.92), rgba(15,23,42,.72));
  backdrop-filter: blur(8px);
  position:sticky;
  top:0;
  z-index:5;
}

.brand{display:flex; align-items:baseline; gap:10px; min-width:0;}
.dot{
  width:10px; height:10px; border-radius:999px;
  background: radial-gradient(circle at 30% 30%, #86efac, var(--accent2));
  box-shadow:0 0 0 4px rgba(34,197,94,.14);
  flex:0 0 auto;
}
.title{font-weight:800; letter-spacing:.2px; white-space:nowrap}
.subtitle{color:var(--muted); font-size:12px; white-space:nowrap; overflow:hidden; text-overflow:ellipsis}

.actions{display:flex; gap:10px; flex-wrap:wrap; align-items:center}
.fileNameInput{
  border:1px solid var(--border);
  border-radius:12px;
  padding:9px 12px;
  background:rgba(17,28,51,.65);
  color:var(--text);
  font-family:var(--sans);
  font-size:14px;
  min-width:150px;
  outline:none;
}
.fileNameInput:focus{
  border-color:rgba(34,197,94,.45);
  background:rgba(17,28,51,.85);
}
.fileNameInput::placeholder{
  color:var(--muted);
}
.btn{
  border:1px solid var(--border);
  border-radius:12px;
  padding:9px 12px;
  font-weight:700;
  cursor:pointer;
  background:rgba(17,28,51,.65);
  color:var(--text);
}
.btn:hover{border-color:rgba(148,163,184,.35); background:rgba(17,28,51,.85)}
.btn:active{transform:translateY(1px)}
.btn-primary{
  border-color:rgba(34,197,94,.45);
  background:linear-gradient(180deg, rgba(34,197,94,.20), rgba(34,197,94,.10));
}
.btn-primary:hover{
  border-color:rgba(34,197,94,.65);
  background:linear-gradient(180deg, rgba(34,197,94,.26), rgba(34,197,94,.14));
}

.grid{
  height:calc(100% - 64px);
  display:grid;
  grid-template-columns: 1fr 1fr;
  gap:14px;
  padding:14px;
}

@media (max-width: 960px){
  .grid{grid-template-columns:1fr; height:auto}
}

.pane{
  min-height:0;
  background:linear-gradient(180deg, rgba(15,23,42,.70), rgba(15,23,42,.45));
  border:1px solid var(--border);
  border-radius:var(--radius);
  box-shadow:var(--shadow);
  overflow:hidden;
  display:flex;
  flex-direction:column;
  position:relative;
}
.paneHeader{
  display:flex;
  justify-content:space-between;
  align-items:baseline;
  padding:12px 14px;
  border-bottom:1px solid var(--border);
  background:rgba(15,23,42,.55);
}
.paneTitle{font-weight:800}
.paneHint{color:var(--muted); font-size:12px}

#editor{
  flex:1;
  width:100%;
  resize:none;
  border:0;
  outline:none;
  background:rgba(17,28,51,.35);
  color:var(--text);
  padding:14px;
  font-family:var(--mono);
  font-size:14px;
  line-height:1.5;
  caret-color:#e5e7eb;
}

.preview{
  flex:1;
  overflow:auto;
  padding:16px 18px;
  background:rgba(2,6,23,.10);
}

/* GitHub-ish markdown styles (minimal, without heavy packages) */
.markdown-body{
  color:#e5e7eb;
}
.markdown-body h1,.markdown-body h2,.markdown-body h3{
  margin:16px 0 10px;
  line-height:1.2;
}
.markdown-body h1{font-size:28px}
.markdown-body h2{font-size:22px}
.markdown-body h3{font-size:18px; color:#cbd5e1}
.markdown-body p{margin:10px 0; color:#e5e7eb}
.markdown-body a{color:#60a5fa}
.markdown-body code{
  font-family:var(--mono);
  background:rgba(148,163,184,.12);
  padding:2px 6px;
  border-radius:8px;
}
.markdown-body pre{
  background:rgba(2,6,23,.55);
  border:1px solid rgba(148,163,184,.18);
  padding:12px 14px;
  border-radius:14px;
  overflow:auto;
}
.markdown-body pre code{background:transparent; padding:0}
.markdown-body blockquote{
  margin:12px 0;
  padding:8px 12px;
  border-left:4px solid rgba(34,197,94,.55);
  background:rgba(34,197,94,.08);
  border-radius:10px;
  color:#d1fae5;
}
.markdown-body hr{border:0; border-top:1px solid rgba(148,163,184,.22); margin:16px 0}
.markdown-body ul,.markdown-body ol{padding-left:22px}
.markdown-body li{margin:6px 0}
.markdown-body table{
  border-collapse:collapse;
  width:100%;
  overflow:hidden;
  border-radius:12px;
  border:1px solid rgba(148,163,184,.18);
}
.markdown-body th,.markdown-body td{
  border-bottom:1px solid rgba(148,163,184,.14);
  padding:10px 12px;
  text-align:left;
}
.markdown-body th{background:rgba(148,163,184,.10)}

/* PDF: white background, typography matching preview weight */
.pdf-export{
  color:#0f172a !important;
  background:#ffffff !important;
  font-size:15px;
  font-weight:450;
  line-height:1.75;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
.pdf-export p{
  color:#0f172a !important;
  font-weight:450;
  margin:10px 0;
}
.pdf-export li{
  color:#0f172a !important;
  font-weight:450;
}
.pdf-export strong{
  font-weight:700 !important;
  color:#0f172a !important;
}
.pdf-export h1{
  color:#0f172a !important;
  font-size:28px;
  font-weight:800 !important;
  letter-spacing:-.3px;
}
.pdf-export h2{
  color:#0f172a !important;
  font-size:22px;
  font-weight:700 !important;
  border-bottom:2px solid #e2e8f0;
  padding-bottom:6px;
}
.pdf-export h3{
  color:#334155 !important;
  font-size:18px;
  font-weight:700 !important;
}
.pdf-export a{color:#2563eb !important}
.pdf-export blockquote{
  color:#334155 !important;
  background:#f0fdf4 !important;
  border-left:4px solid #22c55e !important;
  border-radius:6px;
  padding:8px 14px;
  margin:12px 0;
}
.pdf-export code{
  color:#0f172a !important;
  background:#f1f5f9 !important;
  font-weight:500;
  font-size:0.88em;
  padding:2px 6px;
  border-radius:4px;
}
.pdf-export pre{
  background:#0f172a !important;
  color:#e5e7eb !important;
  border-radius:8px;
  padding:14px 16px;
  font-size:13px;
  line-height:1.6;
}
.pdf-export pre code{
  color:#e5e7eb !important;
  background:transparent !important;
  font-weight:400;
}
.pdf-export table{border-color:#e2e8f0 !important; border-radius:8px;}
.pdf-export th{
  background:#f8fafc !important;
  color:#0f172a !important;
  font-weight:700 !important;
}
.pdf-export td{color:#0f172a !important; font-weight:450;}
/* Prevent page breaks inside elements */
.pdf-export p,
.pdf-export li,
.pdf-export blockquote,
.pdf-export pre,
.pdf-export table,
.pdf-export tr{
  page-break-inside:avoid;
  break-inside:avoid;
}
.pdf-export h1,
.pdf-export h2,
.pdf-export h3{
  page-break-after:avoid;
  break-after:avoid;
}
.pdf-export p,
.pdf-export li,
.pdf-export ul,
.pdf-export ol{
  color:#111827 !important;
}
.pdf-export h1,
.pdf-export h2,
.pdf-export h3{
  color:#0f172a !important;
}
.pdf-export a{color:#2563eb !important}
.pdf-export blockquote{
  color:#0f172a !important;
  background:rgba(22,163,74,.08) !important;
}
.pdf-export code{
  color:#0f172a !important;
  background:rgba(15,23,42,.06) !important;
}
.pdf-export pre{
  background:#0b1020 !important;
  color:#e5e7eb !important;
}
.pdf-export pre code{
  color:#e5e7eb !important;
}
.pdf-export table{border-color:rgba(15,23,42,.18) !important}
.pdf-export th{background:rgba(15,23,42,.06) !important; color:#0f172a !important}
.pdf-export td{color:#0f172a !important}

/* Drag & drop overlay - full screen */
.dropOverlay{
  position:fixed;
  top:0;
  left:0;
  right:0;
  bottom:0;
  background:rgba(11,16,32,.92);
  border:none;
  display:none;
  align-items:center;
  justify-content:center;
  z-index:1000;
  backdrop-filter:blur(12px);
  opacity:0;
  transition:opacity 0.3s ease;
}
.dropOverlay.active{
  display:flex;
  opacity:1;
  animation:dropPulse 2s ease-in-out infinite;
}
body.drop-active .grid,
body.drop-active .topbar{
  filter:blur(4px);
  transition:filter 0.3s ease;
}
.dropOverlay.dragOver{
  background:rgba(11,16,32,.96);
  animation:dropPulseActive 0.6s ease-in-out infinite;
}
.dropContent{
  text-align:center;
  display:flex;
  flex-direction:column;
  align-items:center;
  gap:12px;
  animation:dropContentFade 0.3s ease;
}
.dropPlus{
  width:120px;
  height:120px;
  border-radius:50%;
  background:linear-gradient(180deg, rgba(34,197,94,.25), rgba(34,197,94,.15));
  border:4px solid rgba(34,197,94,.6);
  display:block;
  animation:dropPlusBounce 1.5s ease-in-out infinite;
  box-shadow:0 8px 32px rgba(34,197,94,.2), 0 0 0 8px rgba(34,197,94,.1);
  position:relative;
}
.dropPlus::before,
.dropPlus::after{
  content:"";
  position:absolute;
  background:var(--accent);
  border-radius:2px;
}
.dropPlus::before{
  width:4px;
  height:48px;
  top:50%;
  left:50%;
  transform:translate(-50%, -50%);
}
.dropPlus::after{
  width:48px;
  height:4px;
  top:50%;
  left:50%;
  transform:translate(-50%, -50%);
}
.dropOverlay.dragOver .dropPlus{
  animation:dropPlusBounceActive 0.5s ease-in-out infinite;
  border-color:rgba(34,197,94,1);
  box-shadow:0 8px 32px rgba(34,197,94,.4), 0 0 0 12px rgba(34,197,94,.15);
}
.dropMessage{
  font-size:48px;
  font-weight:900;
  color:var(--accent);
  text-align:center;
  margin:24px 0 0;
  letter-spacing:4px;
  text-shadow:0 4px 16px rgba(34,197,94,.4), 0 0 32px rgba(34,197,94,.2);
  padding:0;
  animation:dropMessagePulse 2s ease-in-out infinite;
}
.dropOverlay.dragOver .dropMessage{
  animation:dropMessagePulseActive 0.6s ease-in-out infinite;
}
.dropHint{
  font-size:16px;
  color:var(--muted);
  font-weight:600;
  margin-top:12px;
  letter-spacing:1px;
}
@keyframes dropPulse{
  0%,100%{
    border-color:rgba(34,197,94,.5);
  }
  50%{
    border-color:rgba(34,197,94,.7);
  }
}
@keyframes dropPulseActive{
  0%,100%{
    border-color:rgba(34,197,94,1);
    box-shadow:0 0 0 0 rgba(34,197,94,.4);
  }
  50%{
    border-color:rgba(34,197,94,1);
    box-shadow:0 0 0 8px rgba(34,197,94,0);
  }
}
@keyframes dropContentFade{
  from{
    opacity:0;
    transform:translateY(-10px);
  }
  to{
    opacity:1;
    transform:translateY(0);
  }
}
@keyframes dropPlusBounce{
  0%,100%{
    transform:translateY(0) scale(1);
  }
  50%{
    transform:translateY(-10px) scale(1.05);
  }
}
@keyframes dropPlusBounceActive{
  0%,100%{
    transform:translateY(0) scale(1);
  }
  50%{
    transform:translateY(-15px) scale(1.1);
  }
}
@keyframes dropMessagePulse{
  0%,100%{
    opacity:1;
    transform:scale(1);
  }
  50%{
    opacity:0.9;
    transform:scale(1.02);
  }
}
@keyframes dropMessagePulseActive{
  0%,100%{
    opacity:1;
    transform:scale(1);
  }
  50%{
    opacity:1;
    transform:scale(1.05);
  }
}