:root {
  --primary: #0072ff;
  --bg: #ffffff;
  --text: #111111;
  --header-bg: #f9f9f9;
  --border: #ddd;
}

[data-theme="dark"] {
  --primary: #3399ff;
  --bg: #1e1e1e;
  --text: #f5f5f5;
  --header-bg: #2a2a2a;
  --border: #444;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }

header.site-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 20px;
  background: var(--header-bg);
  border-bottom: 1px solid var(--border);
}

header .brand {
  display: flex;
  align-items: center;
  font-size: 20px;
  font-weight: bold;
  color: var(--text);
}
header .brand img {
  width: 40px;
  height: 40px;
  margin-right: 10px;
}

.nav { display: flex; gap: 15px; }
.nav a {
  padding: 6px 8px;
  border-radius: 4px;
}
.nav a:hover { background: rgba(0,114,255,0.1); }

#themeToggle {
  cursor: pointer;
  font-size: 16px;
  padding: 6px 10px;
  border: none;
  border-radius: 4px;
  background: var(--primary);
  color: #fff;
}

main.container {
  max-width: 900px;
  margin: 20px auto;
  padding: 0 15px;
}

footer.site-footer {
  text-align: center;
  padding: 20px;
  border-top: 1px solid var(--border);
  background: var(--header-bg);
  font-size: 14px;
  color: var(--text);
}

/* Stile tool PDF */
.pdf-tool .upload-area {
  border: 2px dashed var(--primary);
  padding: 15px;
  width: 280px;
  text-align: center;
  margin-bottom: 15px;
  cursor: pointer;
  border-radius: 8px;
  background: var(--header-bg);
}

.pdf-tool .toolbar {
  margin-bottom: 10px;
}
.pdf-tool .toolbar button {
  margin-right: 5px;
  padding: 6px 10px;
  background: var(--primary);
  border: none;
  border-radius: 4px;
  color: #fff;
  cursor: pointer;
}
.pdf-tool .toolbar button:hover {
  opacity: 0.9;
}

.pdf-container {
  border: 1px solid var(--border);
  overflow: hidden;
  position: relative;
}
#pdfCanvas {
  display: block;
  margin: 0 auto;
  background: #fff;
}


/* PDF preview container adjustments for pinch/zoom/pan and drop zone */
.pdf-preview { position:relative; overflow:auto; min-height:360px; background: var(--bg); }
#pdfDropZone {
  position:absolute;
  top:12px;
  left:12px;
  width:280px;
  padding:12px;
  border:2px dashed var(--primary);
  border-radius:8px;
  background: rgba(255,255,255,0.9);
  z-index:1000;
  cursor:pointer;
  box-shadow: 0 6px 18px rgba(0,0,0,0.06);
}
#pdfDropZone.dragover { background: rgba(0,114,255,0.06); border-color: var(--primary); }
#pdfCanvas { display:block; transform-origin: 0 0; max-width:none; }

/* --- Mobile Optimizations (add this section at the end of the file) --- */
@media (max-width: 768px) {
  /* Adjust header and navigation */
  header.site-header {
    flex-direction: column;
    align-items: flex-start;
    padding: 10px;
  }

  header .brand {
    font-size: 18px;
    margin-bottom: 10px;
  }

  .nav {
    width: 100%;
    justify-content: space-around;
    gap: 0;
  }

  /* Adjust main container padding */
  main.container {
    padding: 0 10px;
    margin: 10px auto;
  }

  /* Adjust PDF tool elements */
  .pdf-tool .upload-area,
  #pdfDropZone {
    width: 100%;
    padding: 12px;
    left: 0;
    top: 0;
    right: 0;
  }

  .pdf-tool .toolbar {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
  }

  .pdf-tool .toolbar button {
    margin: 5px;
    width: auto;
    flex-grow: 1;
  }

  footer.site-footer {
    padding: 15px;
  }
}