:root {
  color-scheme: light dark;
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  --bg-main: #070b12;
  --bg-panel: #0b111b;
  --bg-elevated: #0e1623;
  --border: #1a263a;
  --border-strong: #24385a;
  --text-main: #eef4ff;
  --text-muted: #97a8c4;
  --accent: #2f6fe6;
  --accent-strong: #3b82ff;
  --danger: #d75959;
  --success: #3bb870;
}

body {
  margin: 0;
  background: var(--bg-main);
  color: var(--text-main);
  position: relative;
  min-height: 100vh;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: -1;
  background:
    linear-gradient(to right, rgba(120, 160, 230, 0.08) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(120, 160, 230, 0.07) 1px, transparent 1px);
  background-size: 88px 88px;
  opacity: 0.38;
}

.app-layout {
  width: min(2200px, 100%);
  margin: 0 auto;
  padding: 1.25rem;
  box-sizing: border-box;
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 1.25rem;
}

.left-pane,
.right-pane {
  min-width: 0;
}

.container {
  width: 100%;
}

h1 {
  margin-bottom: 0.2rem;
  margin-top: 0;
  letter-spacing: 0.2px;
  font-weight: 700;
}

.subtitle {
  margin-top: 0;
  color: var(--text-muted);
}

.card {
  background: linear-gradient(180deg, rgba(12, 18, 29, 0.98), rgba(10, 16, 25, 0.98));
  border: 1px solid var(--border);
  border-radius: 2px;
  padding: 1rem;
  margin-top: 1rem;
  box-shadow: 0 0 0 1px rgba(8, 12, 20, 0.6);
}

.drop-zone {
  border: 1px dashed var(--border-strong);
  border-radius: 2px;
  padding: 1.4rem;
  text-align: center;
  cursor: pointer;
  transition: border-color 0.15s ease, background 0.15s ease;
  background: rgba(8, 13, 22, 0.65);
}

.drop-zone.dragover {
  border-color: var(--accent-strong);
  background: rgba(59, 130, 255, 0.1);
}

.selected-file {
  margin-top: 0.8rem;
  color: #c9d7ef;
  font-size: 0.95rem;
}

.page-selection {
  margin-top: 1rem;
  border: 1px solid var(--border);
  border-radius: 2px;
  padding: 0.9rem;
  background: var(--bg-elevated);
}

.page-selection-header {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 0.75rem;
}

.page-selection-header h2 {
  margin: 0;
  font-size: 1rem;
}

.page-selection-actions {
  display: flex;
  gap: 0.5rem;
}

.page-selection-actions button {
  padding: 0.4rem 0.6rem;
  background: rgba(21, 34, 56, 0.9);
  border-color: var(--border-strong);
  color: #d6e4ff;
  border-radius: 2px;
  min-width: 72px;
  transition: border-color 0.15s ease, background 0.15s ease;
}

.page-selection-actions button:hover {
  border-color: var(--accent-strong);
  background: rgba(26, 45, 74, 0.95);
}

.page-selection-hint {
  margin: 0.7rem 0 0.5rem;
  color: var(--text-muted);
  font-size: 0.9rem;
}

.page-checkboxes {
  max-height: 210px;
  overflow-y: auto;
  padding: 0.2rem;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
  gap: 0.5rem;
}

.page-checkbox-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.35rem 0.45rem;
  border: 1px solid #233249;
  border-radius: 2px;
  background: rgba(12, 19, 31, 0.96);
  font-size: 0.92rem;
}

.page-checkbox-item input {
  margin: 0;
  accent-color: var(--accent);
}

.preview-card {
  margin-top: 0;
  height: calc(100vh - 2.5rem);
  min-height: 520px;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.preview-title {
  margin: 0;
  font-size: 1rem;
}

.preview-help {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.88rem;
  line-height: 1.35;
}

.preview-help kbd {
  display: inline-block;
  padding: 0.1rem 0.35rem;
  margin: 0 0.05rem;
  font-size: 0.8em;
  font-family: inherit;
  border: 1px solid var(--border-strong);
  border-radius: 2px;
  background: rgba(8, 13, 22, 0.9);
  color: #d6e4ff;
}

.preview-card:focus {
  outline: none;
}

.preview-card:focus-visible {
  box-shadow: 0 0 0 2px var(--bg-panel), 0 0 0 4px var(--accent-strong);
}

.preview-toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  gap: 0.65rem;
}

.preview-page-label {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  font-size: 0.9rem;
  min-width: 140px;
}

.preview-page-label select {
  padding: 0.45rem;
  border-radius: 2px;
  border: 1px solid #22344d;
  background: #0c131f;
  color: var(--text-main);
}

.btn-secondary {
  padding: 0.45rem 0.65rem;
  border-radius: 2px;
  cursor: pointer;
  align-self: end;
  background: rgba(21, 34, 56, 0.9);
  border: 1px solid var(--border-strong);
  color: #d6e4ff;
  font-weight: 600;
  transition: border-color 0.15s ease, background 0.15s ease;
}

.btn-secondary:hover {
  border-color: var(--accent-strong);
  background: rgba(26, 45, 74, 0.95);
}

.crop-hint {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.86rem;
}

.preview-status {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.92rem;
}

.preview-stage {
  flex: 1;
  min-height: 0;
  overflow: auto;
  border: 1px solid var(--border);
  border-radius: 2px;
  background: #070b12;
  padding: 0.35rem;
}

.preview-canvas-stack {
  position: relative;
  display: inline-block;
  line-height: 0;
  vertical-align: top;
}

.pdf-render-canvas {
  display: block;
  max-width: 100%;
  height: auto;
}

.crop-overlay-canvas {
  position: absolute;
  left: 0;
  top: 0;
  display: block;
  touch-action: none;
  cursor: crosshair;
}

.settings {
  display: grid;
  grid-template-columns: repeat(3, minmax(150px, 1fr));
  gap: 0.8rem;
  margin-top: 1rem;
}

label {
  display: grid;
  gap: 0.35rem;
  font-size: 0.95rem;
}

input,
button {
  padding: 0.55rem;
  border-radius: 2px;
  border: 1px solid #22344d;
  background: #0c131f;
  color: var(--text-main);
}

button {
  align-self: end;
  cursor: pointer;
  background: var(--accent);
  border-color: var(--accent-strong);
  color: #f3f8ff;
  font-weight: 600;
  transition: background 0.15s ease, border-color 0.15s ease, transform 0.1s ease;
}

button:hover:not(:disabled) {
  background: #3b7ef5;
  border-color: #5a97ff;
}

button:active:not(:disabled) {
  transform: translateY(1px);
}

button:disabled {
  opacity: 0.6;
  cursor: wait;
}

.overlay {
  position: fixed;
  inset: 0;
  background: rgba(3, 6, 10, 0.8);
  display: grid;
  place-content: center;
  text-align: center;
  gap: 0.75rem;
}

.spinner {
  width: 44px;
  height: 44px;
  border: 4px solid rgba(255, 255, 255, 0.25);
  border-top-color: #ffffff;
  border-radius: 50%;
  animation: spin 0.85s linear infinite;
  justify-self: center;
}

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

.hidden {
  display: none;
}

.success {
  border-left: 2px solid var(--success);
}

.error {
  border-left: 2px solid var(--danger);
}

.open-folder-btn {
  margin-top: 0.5rem;
  padding: 0.4rem 0.75rem;
  font-size: 0.9rem;
  background: transparent;
  border-color: var(--accent);
  color: var(--accent-strong);
}

.open-folder-btn:hover {
  background: rgba(47, 111, 230, 0.15);
}

@media (max-width: 760px) {
  .app-layout {
    grid-template-columns: 1fr;
    padding: 0.8rem;
  }

  .preview-card {
    height: 500px;
    min-height: 500px;
  }

  .settings {
    grid-template-columns: 1fr;
  }
}