/* ============================================
   JPG/PNG to PDF — Full Screen Styles
   Pure CSS. No frameworks.
   ============================================ */

:root {
  --bg-deep: #070b14;
  --bg-surface: rgba(255, 255, 255, 0.035);
  --bg-surface-hover: rgba(255, 255, 255, 0.08);
  --glass-border: rgba(255, 255, 255, 0.08);
  --text-main: #f0f4f8;
  --text-muted: #94a3b8;
  --accent: #38bdf8;
  --accent-soft: #7dd3fc;
  --accent-glow: rgba(56, 189, 248, 0.35);
  --accent-secondary: #f472b6;
  --shadow-deep: rgba(0, 0, 0, 0.6);
  --radius: 22px;
  --radius-sm: 14px;
  --transition: 0.25s ease;
}

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

html, body {
  height: 100%;
  width: 100%;
  overflow: hidden;
  background: var(--bg-deep);
  color: var(--text-main);
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica Neue, Arial, "Noto Sans", sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  line-height: 1.45;
}

/* Animated gradient mesh */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background:
    radial-gradient(at 15% 15%, rgba(56, 189, 248, 0.22) 0%, transparent 55%),
    radial-gradient(at 80% 20%, rgba(244, 114, 182, 0.18) 0%, transparent 50%),
    radial-gradient(at 50% 85%, rgba(56, 189, 248, 0.14) 0%, transparent 55%),
    radial-gradient(at 90% 80%, rgba(244, 114, 182, 0.1) 0%, transparent 45%);
  animation: meshMove 28s ease-in-out infinite alternate;
}

@keyframes meshMove {
  from { transform: translate(0, 0) scale(1); }
  to   { transform: translate(-15px, 12px) scale(1.04); }
}

#app {
  position: relative;
  z-index: 1;
  height: 100vh;
  width: 100vw;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

/* Header */
.header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 22px 36px 14px;
  gap: 24px;
  flex-shrink: 0;
}

.logo-wrap {
  display: flex;
  align-items: center;
  gap: 16px;
}

.logo-icon {
  width: 52px;
  height: 52px;
  flex-shrink: 0;
  filter: drop-shadow(0 0 12px var(--accent-glow));
}

.logo-wrap h1 {
  font-size: 1.5rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.1;
  background: linear-gradient(135deg, #fff 40%, var(--accent-soft));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.tagline {
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-top: 2px;
}

.header-meta {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.meta-badge {
  background: var(--bg-surface);
  border: 1px solid var(--glass-border);
  color: var(--text-muted);
  padding: 6px 14px;
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
}

/* Main layout */
.main {
  flex: 1 1 auto;
  overflow-y: auto;
  overflow-x: hidden;
  padding: 0 36px 36px;
  display: grid;
  grid-template-columns: 1fr 420px;
  gap: 28px;
  align-items: start;
}

/* Drop zone */
.drop-zone {
  position: relative;
  border: 2px dashed rgba(255, 255, 255, 0.14);
  border-radius: var(--radius);
  background: linear-gradient(180deg, rgba(255,255,255,0.03) 0%, rgba(255,255,255,0.01) 100%);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  transition: border-color var(--transition), background var(--transition), box-shadow var(--transition);
  min-height: 230px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 40px 28px;
}

.drop-zone.drag-over {
  border-color: var(--accent);
  background: linear-gradient(180deg, rgba(56,189,248,0.08) 0%, rgba(56,189,248,0.04) 100%);
  box-shadow: 0 0 0 4px rgba(56, 189, 248, 0.15);
}

.drop-inner {
  text-align: center;
  max-width: 480px;
}

.drop-icon {
  width: 72px;
  height: 72px;
  margin: 0 auto 16px;
  color: var(--accent-soft);
  opacity: 0.9;
}

.drop-zone h2 {
  font-size: 1.35rem;
  font-weight: 700;
  margin-bottom: 8px;
  letter-spacing: -0.02em;
}

.drop-zone p {
  color: var(--text-muted);
  font-size: 0.92rem;
  margin-bottom: 20px;
}

/* Buttons */
.btn-primary, .btn-accent, .btn-small {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border: none;
  border-radius: 14px;
  padding: 12px 24px;
  font-size: 0.92rem;
  font-weight: 700;
  cursor: pointer;
  transition: transform 0.12s ease, box-shadow var(--transition), background var(--transition);
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-soft) 100%);
  color: #fff;
  box-shadow: 0 8px 24px var(--accent-glow);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 14px 32px rgba(56, 189, 248, 0.45);
}

.btn-accent {
  background: linear-gradient(135deg, #f472b6 0%, #fb7185 100%);
  color: #fff;
  box-shadow: 0 8px 24px rgba(244, 114, 182, 0.35);
}

.btn-accent:hover {
  transform: translateY(-2px);
  box-shadow: 0 14px 32px rgba(244, 114, 182, 0.45);
}

.btn-accent:disabled {
  opacity: 0.35;
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}

.btn-small {
  background: var(--bg-surface);
  color: var(--text-main);
  border: 1px solid var(--glass-border);
  padding: 8px 14px;
  font-size: 0.8rem;
  border-radius: 12px;
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
}

.btn-small:hover {
  background: var(--bg-surface-hover);
}

.btn-small:disabled {
  opacity: 0.35;
  cursor: not-allowed;
}

/* Side panel layout */
.side-panel {
  display: flex;
  flex-direction: column;
  gap: 20px;
  max-height: 78vh;
}

/* Files panel */
.files-panel {
  background: rgba(255,255,255,0.03);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  padding: 22px 22px 22px;
  display: flex;
  flex-direction: column;
  flex: 1 1 auto;
  min-height: 320px;
}

.panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 16px;
  flex-wrap: wrap;
}

.panel-header h3 {
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.panel-header h3 span {
  color: var(--text-muted);
  font-weight: 600;
  font-size: 0.85rem;
}

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

/* Preview grid */
.preview-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(110px, 1fr));
  gap: 14px;
  overflow-y: auto;
  flex: 1 1 auto;
  padding-right: 4px;
  scrollbar-width: thin;
  scrollbar-color: rgba(255,255,255,0.1) transparent;
  min-height: 180px;
}

.preview-grid::-webkit-scrollbar { width: 6px; }
.preview-grid::-webkit-scrollbar-track { background: transparent; }
.preview-grid::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.1); border-radius: 99px; }
.preview-grid::-webkit-scrollbar-thumb:hover { background: rgba(255,255,255,0.2); }

/* Image card */
.img-card {
  position: relative;
  background: linear-gradient(135deg, rgba(255,255,255,0.05) 0%, rgba(255,255,255,0.02) 100%);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: var(--radius-sm);
  overflow: hidden;
  transition: transform 0.15s ease, border-color var(--transition), box-shadow var(--transition);
  cursor: grab;
  user-select: none;
}

.img-card:active { cursor: grabbing; }
.img-card:hover { border-color: rgba(56,189,248,0.35); box-shadow: 0 4px 16px rgba(56,189,248,0.15); transform: translateY(-2px); }

.img-card .thumb-wrap {
  aspect-ratio: 4 / 3;
  overflow: hidden;
  position: relative;
}

.img-card .thumb-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 0.3s ease;
}

.img-card:hover .thumb-wrap img { transform: scale(1.05); }

.img-card .card-info {
  padding: 10px 10px 8px;
}

.img-card .card-info .name {
  font-weight: 600;
  font-size: 0.78rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  color: var(--text-main);
}

.img-card .card-info .meta {
  font-size: 0.72rem;
  color: var(--text-muted);
  margin-top: 2px;
}

.img-card .controls {
  position: absolute;
  top: 6px;
  right: 6px;
  display: flex;
  gap: 4px;
  opacity: 0;
  transition: opacity 0.2s ease;
}

.img-card:hover .controls { opacity: 1; }

.img-card .controls button {
  width: 26px;
  height: 26px;
  border-radius: 6px;
  border: 1px solid rgba(255,255,255,0.1);
  background: rgba(11,12,21,0.75);
  color: #fff;
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  transition: background var(--transition);
}

.img-card .controls button:hover { background: var(--accent); border-color: var(--accent); }
.img-card .controls .remove-btn:hover { background: #f43f5e; border-color: #f43f5e; }

.img-card .index-badge {
  position: absolute;
  top: 6px;
  left: 6px;
  width: 22px;
  height: 22px;
  border-radius: 6px;
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-soft) 100%);
  color: #fff;
  font-weight: 800;
  font-size: 0.7rem;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 2px 6px rgba(56,189,248,0.35);
}

/* Empty state */
.empty-state {
  text-align: center;
  color: var(--text-muted);
  padding: 28px 0;
  font-size: 0.9rem;
  display: none;
}
.empty-state.visible { display: block; }

/* Settings panel */
.settings-panel {
  background: rgba(255,255,255,0.03);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  padding: 20px 22px;
}

.settings-panel h4 {
  font-size: 0.95rem;
  font-weight: 700;
  margin-bottom: 14px;
  letter-spacing: -0.01em;
}

.setting-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 14px;
  font-size: 0.85rem;
  color: var(--text-main);
}

.setting-row input[type="range"] {
  width: 120px;
  accent-color: var(--accent);
  cursor: pointer;
}

.range-label {
  min-width: 36px;
  text-align: right;
  font-weight: 600;
  color: var(--text-muted);
  font-size: 0.8rem;
}

.radio-group {
  display: flex;
  gap: 14px;
  color: var(--text-muted);
  font-size: 0.82rem;
}

.radio-group label { display: flex; align-items: center; gap: 6px; cursor: pointer; }
.radio-group input { accent-color: var(--accent); cursor: pointer; }

.checkbox-row { align-items: flex-start; }
.checkbox-row input { margin-top: 2px; accent-color: var(--accent); cursor: pointer; }

/* Info bar */
.info-bar {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-top: 6px;
}

.info-card {
  background: rgba(255,255,255,0.03);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  padding: 22px 24px;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.info-card h4 {
  font-weight: 700;
  margin-bottom: 10px;
  font-size: 0.95rem;
  letter-spacing: -0.01em;
}

.info-card ol {
  padding-left: 18px;
  color: var(--text-muted);
  font-size: 0.85rem;
  line-height: 1.7;
}
.info-card ol li { margin-bottom: 4px; }

.info-card p {
  color: var(--text-muted);
  font-size: 0.85rem;
  line-height: 1.65;
}

/* Footer */
.footer {
  padding: 8px 36px 16px;
  text-align: center;
  font-size: 0.78rem;
  color: var(--text-muted);
  flex-shrink: 0;
}

.footer a {
  color: var(--accent-soft);
  text-decoration: none;
  font-weight: 600;
}
.footer a:hover { text-decoration: underline; }

/* Overlay */
.overlay {
  position: fixed;
  inset: 0;
  z-index: 100;
  background: rgba(7, 11, 20, 0.7);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
}

.overlay.active {
  opacity: 1;
  pointer-events: auto;
}

.overlay-content {
  background: linear-gradient(180deg, rgba(255,255,255,0.06), rgba(255,255,255,0.03));
  border: 1px solid var(--glass-border);
  border-radius: 24px;
  padding: 48px 40px;
  text-align: center;
  max-width: 420px;
  width: 90vw;
  box-shadow: 0 24px 60px rgba(0,0,0,0.5);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
}

.overlay-content h3 {
  font-size: 1.15rem;
  margin: 16px 0 6px;
  font-weight: 700;
}

.overlay-content p {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-bottom: 20px;
}

.spinner {
  width: 48px;
  height: 48px;
  margin: 0 auto;
  border: 4px solid rgba(255,255,255,0.08);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.9s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.progress-wrap {
  width: 100%;
  height: 10px;
  background: rgba(255,255,255,0.06);
  border-radius: 99px;
  overflow: hidden;
}

.progress-bar {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--accent) 0%, var(--accent-soft) 100%);
  border-radius: 99px;
  transition: width 0.25s ease;
  box-shadow: 0 0 10px var(--accent-glow);
}

/* Responsive */
@media (max-width: 1020px) {
  .main { grid-template-columns: 1fr; }
  .side-panel { max-height: 60vh; }
  .drop-zone { min-height: 180px; padding: 28px 20px; }
}

@media (max-width: 640px) {
  .header { padding: 18px 16px 10px; }
  .main { padding: 0 16px 24px; gap: 20px; }
  .drop-zone { padding: 24px 16px; }
  .info-bar { grid-template-columns: 1fr; }
  .logo-wrap h1 { font-size: 1.2rem; }
  .footer { padding: 8px 16px 12px; }
}