:root {
  --bg: #000000;
  --card: #111111;
  --muted: #ffffff;
  --text: #ffffff;
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --secondary: #374151;
  --border: #1f2937;
}

* { box-sizing: border-box; font-weight: 700; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: Arial, sans-serif;
  background: #000000;
  color: var(--text);
}

.app-header { text-align: center; padding: 28px 16px 10px; }
.app-header h1 { margin: 0; font-size: 28px; letter-spacing: 0.3px; }
.app-header p { margin: 8px 0 0; color: var(--muted); }
.top-nav { margin-top: 10px; display: flex; gap: 12px; justify-content: center; }
.top-nav a { color: var(--text); text-decoration: none; padding: 6px 10px; border-radius: 8px; border: 1px solid var(--border); background: #0b122e; }
.top-nav a:hover { background: #13204a; }

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 16px;
}

.tabs { display: flex; gap: 8px; margin-bottom: 12px; }
.tab {
  padding: 10px 14px;
  background: var(--secondary);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 10px;
  cursor: pointer;
}
.tab.active { background: var(--primary); border-color: var(--primary); }

.panel { display: none; }
.panel.active { display: block; }

.uploader {
  background: var(--card);
  border: 2px dashed var(--border);
  border-radius: 16px;
  padding: 18px;
  position: relative;
}
.uploader input[type="file"] {
  position: absolute;
  inset: 0;
  opacity: 0;
  cursor: pointer;
}
.uploader-hint { text-align: center; color: var(--muted); }
.uploader.dragover { border-color: var(--primary); background: #0f1b3a; }

.list {
  margin-top: 16px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
}
.list-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 14px 16px;
  border-bottom: 1px solid var(--border);
}
.file-list { list-style: none; margin: 0; padding: 8px; }
.file-item {
  display: grid;
  grid-template-columns: 72px 1fr auto;
  align-items: center;
  gap: 12px;
  padding: 8px;
  border-radius: 12px;
}
.file-item + .file-item { border-top: 1px solid var(--border); }
.thumb {
  width: 64px; height: 90px; background: #0b122e; border: 1px solid var(--border);
  border-radius: 8px; display: grid; place-items: center; overflow: hidden;
}
.thumb canvas { width: 100%; height: 100%; display: block; }
.file-name { font-weight: 700; }
.file-meta { color: var(--muted); font-size: 12px; }
.item-actions { display: flex; gap: 6px; }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 14px;
  border-radius: 10px;
  border: 1px solid var(--border);
  cursor: pointer;
  background: var(--secondary);
  color: var(--text);
}
.btn.primary { background: var(--primary); border-color: var(--primary); }
.btn.primary:hover { background: var(--primary-hover); }
.btn.secondary:hover { background: #3b4453; }
.btn.icon { padding: 8px 10px; }

.split-controls {
  display: grid;
  align-items: start;
  gap: 10px;
  margin: 16px 0;
}
.split-controls input {
  padding: 10px 12px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: #0b122e;
  color: var(--text);
}

.preview-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 12px;
}
.preview-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 8px;
}
.preview-card .thumb { width: 100%; height: 180px; }
.preview-card .page-label { text-align: center; margin-top: 6px; color: var(--muted); }

.actions { display: flex; gap: 8px; }

.app-footer { text-align: center; color: var(--muted); padding: 20px; }
.app-footer p { color: var(--muted); margin: 6px 0 0; }
.footer-nav { margin-top: 10px; display: flex; gap: 12px; justify-content: center; }
.footer-nav a { color: var(--text); text-decoration: none; padding: 6px 10px; border-radius: 8px; border: 1px solid var(--border); background: #0b122e; }
.footer-nav a:hover { background: #13204a; }

.legal { background: var(--card); border: 1px solid var(--border); border-radius: 16px; padding: 16px; }

.alert {
  margin: 8px 12px;
  padding: 10px 12px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: #0b122e;
  color: var(--text);
}
.alert.success { background: #0e1f3a; border-color: #14532d; }
.alert.error { background: #1a0f10; border-color: #7f1d1d; }

.ad-slot { margin-top: 12px; }
.ad-box {
  display: grid;
  place-items: center;
  border: 1px dashed var(--border);
  border-radius: 12px;
  background: #0b122e;
  color: var(--muted);
  min-height: 80px;
}
.floating-ad {
  position: fixed;
  right: 16px;
  bottom: 16px;
  z-index: 9999;
}
.floating-close {
  position: absolute;
  top: -10px;
  right: -10px;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: #222222;
  color: #ffffff;
  cursor: pointer;
}
@media (max-width: 480px) {
  .floating-ad { right: 8px; bottom: 8px; }
}
.responsive-break { display: none; }

@media (max-width: 1024px) {
  .container { padding: 14px; }
  .tabs { flex-wrap: wrap; }
  .preview-grid { grid-template-columns: repeat(auto-fill, minmax(160px, 1fr)); }
}

@media (max-width: 768px) {
  .app-header h1 { font-size: 24px; }
  .tabs { gap: 6px; }
  .tab { width: 100%; justify-content: center; }
  .list-header { flex-direction: column; align-items: stretch; gap: 10px; }
  .actions { flex-wrap: wrap; }
  .btn { width: 100%; justify-content: center; }
  .file-item { grid-template-columns: 56px 1fr; }
  .item-actions { justify-content: flex-end; }
  .preview-grid { grid-template-columns: repeat(auto-fill, minmax(140px, 1fr)); }
}

@media (max-width: 480px) {
  .container { padding: 10px; }
  .app-header h1 { font-size: 20px; }
  .uploader { padding: 14px; }
  .uploader-hint { font-size: 14px; }
  .file-item { gap: 8px; }
  .thumb { width: 48px; height: 68px; }
  .file-name { font-size: 14px; }
  .file-meta { font-size: 11px; }
  .preview-card .thumb { height: 140px; }
  .top-nav, .footer-nav { flex-wrap: wrap; gap: 8px; }
}