/* ==========================================================================
   Apple-Inspired Minimalist Design System
   ========================================================================== */

:root {
  /* Dark Mode Palette (Default - Apple Dark) */
  --bg-app: #121214;
  --bg-surface: #1c1c1e;
  --bg-surface-elevated: #2c2c2e;
  --bg-input: #242426;
  --bg-input-hover: #2c2c30;

  --accent-color: #2997ff;
  --accent-hover: #147ce5;
  --accent-tint: rgba(41, 151, 255, 0.12);

  --text-primary: #f5f5f7;
  --text-secondary: #86868b;
  --text-tertiary: #6e6e73;
  --text-danger: #ff453a;

  --border-hairline: rgba(255, 255, 255, 0.08);
  --border-focus: #2997ff;

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.2);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.25);
  --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.35);

  --radius-xs: 4px;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-pill: 980px;

  --font-system: -apple-system, BlinkMacSystemFont, "SF Pro Text", "SF Pro Display", "Inter", "Helvetica Neue", sans-serif;
  --font-mono: "SF Mono", "JetBrains Mono", Menlo, monospace;

  --ease-apple: cubic-bezier(0.25, 1, 0.5, 1);
}

/* Light Mode Palette (Apple Light) */
body[data-theme="light"] {
  --bg-app: #f5f5f7;
  --bg-surface: #ffffff;
  --bg-surface-elevated: #ffffff;
  --bg-input: #e8e8ed;
  --bg-input-hover: #dedee3;

  --accent-color: #0071e3;
  --accent-hover: #0077ed;
  --accent-tint: rgba(0, 113, 227, 0.1);

  --text-primary: #1d1d1f;
  --text-secondary: #86868b;
  --text-tertiary: #a1a1a6;
  --text-danger: #ff3b30;

  --border-hairline: rgba(0, 0, 0, 0.08);
  --border-focus: #0071e3;

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 4px 14px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.08);
}

/* Reset & Base */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 15px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-system);
  background-color: var(--bg-app);
  color: var(--text-primary);
  line-height: 1.47059;
  letter-spacing: -0.016em;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.app-layout {
  max-width: 1280px;
  margin: 0 auto;
  padding: 1.5rem 2rem 3rem;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  gap: 1.75rem;
}

/* Navigation Header */
.app-nav {
  position: sticky;
  top: 1rem;
  z-index: 100;
}

.nav-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--bg-surface);
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-pill);
  padding: 0.5rem 1.25rem;
  box-shadow: var(--shadow-sm);
  backdrop-filter: blur(20px);
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.65rem;
}

.brand-icon {
  width: 28px;
  height: 28px;
  border-radius: 6px;
  background: var(--accent-color);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
}

.brand-icon svg {
  width: 16px;
  height: 16px;
  stroke-width: 2.2px;
}

.brand-name {
  font-size: 0.95rem;
  font-weight: 600;
  letter-spacing: -0.02em;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.privacy-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--text-secondary);
  background: var(--bg-input);
  padding: 0.25rem 0.65rem;
  border-radius: var(--radius-pill);
}

.privacy-pill svg {
  width: 12px;
  height: 12px;
  stroke-width: 2px;
}

.theme-btn {
  position: relative;
  width: 32px;
  height: 32px;
  border-radius: var(--radius-pill);
  background: var(--bg-input);
  border: none;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: background-color 0.15s ease;
}

.theme-btn:hover {
  background: var(--bg-input-hover);
}

.icon-sun, .icon-moon {
  position: absolute;
  display: flex;
  align-items: center;
  justify-content: center;
}

.theme-btn svg {
  width: 15px;
  height: 15px;
  stroke-width: 2px;
}

body[data-theme="dark"] .icon-sun { display: flex; }
body[data-theme="dark"] .icon-moon { display: none; }
body[data-theme="light"] .icon-sun { display: none; }
body[data-theme="light"] .icon-moon { display: flex; }

/* Main Content Grid */
.main-content {
  display: grid;
  grid-template-columns: 1fr 340px;
  gap: 1.75rem;
  flex: 1;
  align-items: start;
}

@media (max-width: 980px) {
  .main-content {
    grid-template-columns: 1fr;
  }
}

/* Canvas & Dropzone Section */
.canvas-section {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

/* Minimal Dropzone */
.minimal-dropzone {
  position: relative;
  background: var(--bg-surface);
  border: 1px dashed var(--border-hairline);
  border-radius: var(--radius-lg);
  padding: 3.5rem 2rem;
  text-align: center;
  cursor: pointer;
  outline: none;
  transition: all 0.2s var(--ease-apple);
}

.minimal-dropzone:hover,
.minimal-dropzone.drag-active {
  border-color: var(--accent-color);
  background: var(--accent-tint);
  border-style: solid;
}

.minimal-dropzone:focus-visible {
  border-color: var(--border-focus);
}

.file-input-hidden {
  position: absolute;
  inset: 0;
  opacity: 0;
  cursor: pointer;
  width: 100%;
  height: 100%;
}

.dropzone-body {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.85rem;
  pointer-events: none;
}

.upload-symbol {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-pill);
  background: var(--accent-tint);
  color: var(--accent-color);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.2s var(--ease-apple);
}

.upload-symbol svg {
  width: 26px;
  height: 26px;
  stroke-width: 1.75px;
}

.minimal-dropzone:hover .upload-symbol {
  transform: translateY(-2px);
}

.drop-headlines h2 {
  font-size: 1.25rem;
  font-weight: 600;
  letter-spacing: -0.02em;
}

.drop-headlines p {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-top: 0.15rem;
}

.action-link {
  color: var(--accent-color);
  font-weight: 500;
}

.drop-meta {
  font-size: 0.78rem;
  color: var(--text-tertiary);
  margin-top: 0.4rem;
}

/* Workspace & Reordering Bar */
.workspace-panel {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.workspace-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--bg-surface);
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-md);
  padding: 0.5rem 0.85rem;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.bar-left {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.badge-count {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-primary);
  background: var(--bg-input);
  padding: 0.2rem 0.55rem;
  border-radius: var(--radius-pill);
}

.bar-hint {
  font-size: 0.78rem;
  color: var(--text-secondary);
}

.bar-right {
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

/* Thumbnails Grid */
.thumbnails-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(170px, 1fr));
  gap: 1rem;
}

/* Thumbnail Card */
.image-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-md);
  padding: 8px;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  position: relative;
  cursor: grab;
  user-select: none;
  box-shadow: var(--shadow-sm);
  transition: transform 0.15s ease, box-shadow 0.15s ease, opacity 0.15s ease;
}

.image-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.image-card:active {
  cursor: grabbing;
}

.image-card.dragging {
  opacity: 0.35;
  transform: scale(0.97);
}

.image-card.drag-over-left {
  border-left: 3px solid var(--accent-color);
}

.image-card.drag-over-right {
  border-right: 3px solid var(--accent-color);
}

.card-header-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.page-num-tag {
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--text-secondary);
  font-family: var(--font-mono);
}

.drag-handle-indicator {
  color: var(--text-tertiary);
  display: flex;
  align-items: center;
}

.drag-handle-indicator svg {
  width: 14px;
  height: 14px;
}

.card-thumb-wrapper {
  position: relative;
  width: 100%;
  aspect-ratio: 4 / 3;
  background: var(--bg-input);
  border-radius: 6px;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}

.card-thumb-img {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
  transition: transform 0.2s var(--ease-apple);
}

.card-thumb-overlay {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.4);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  opacity: 0;
  transition: opacity 0.15s ease;
}

.card-thumb-wrapper:hover .card-thumb-overlay {
  opacity: 1;
}

.overlay-btn {
  background: rgba(255, 255, 255, 0.25);
  color: white;
  border: none;
  border-radius: var(--radius-pill);
  width: 30px;
  height: 30px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  backdrop-filter: blur(4px);
  transition: transform 0.15s ease, background-color 0.15s ease;
}

.overlay-btn:hover {
  background: rgba(255, 255, 255, 0.4);
  transform: scale(1.08);
}

.overlay-btn svg {
  width: 14px;
  height: 14px;
  stroke-width: 2px;
}

.card-meta {
  display: flex;
  flex-direction: column;
  gap: 0.1rem;
}

.card-filename {
  font-size: 0.75rem;
  font-weight: 500;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.card-subinfo {
  display: flex;
  justify-content: space-between;
  font-size: 0.68rem;
  color: var(--text-secondary);
  font-family: var(--font-mono);
}

.card-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 0.35rem;
  border-top: 1px solid var(--border-hairline);
  margin-top: auto;
}

.card-btn-group {
  display: flex;
  align-items: center;
  gap: 0.15rem;
}

.card-action-btn {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  width: 24px;
  height: 24px;
  border-radius: var(--radius-xs);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: background-color 0.15s ease, color 0.15s ease;
}

.card-action-btn:hover:not(:disabled) {
  background: var(--bg-input);
  color: var(--text-primary);
}

.card-action-btn:disabled {
  opacity: 0.25;
  cursor: not-allowed;
}

.card-action-btn.delete-btn:hover {
  color: var(--text-danger);
}

.card-action-btn svg {
  width: 13px;
  height: 13px;
  stroke-width: 2px;
}

/* Inspector / Settings Sidebar */
.inspector-section {
  position: sticky;
  top: 4.5rem;
}

.inspector-box {
  background: var(--bg-surface);
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.inspector-title h3 {
  font-size: 0.95rem;
  font-weight: 600;
  letter-spacing: -0.015em;
}

.settings-stack {
  display: flex;
  flex-direction: column;
  gap: 0.9rem;
}

.setting-row {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}

.setting-row label {
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--text-secondary);
}

/* Apple Input & Select Box */
.apple-input-box,
.apple-select-box {
  position: relative;
  display: flex;
  align-items: center;
  background: var(--bg-input);
  border-radius: var(--radius-sm);
  transition: box-shadow 0.15s ease;
}

.apple-input-box:focus-within,
.apple-select-box:focus-within {
  box-shadow: 0 0 0 2px var(--border-focus);
}

.apple-input-box input {
  width: 100%;
  border: none;
  background: transparent;
  padding: 0.5rem 0.75rem;
  font-family: var(--font-system);
  font-size: 0.85rem;
  color: var(--text-primary);
  outline: none;
}

.ext-label {
  padding-right: 0.75rem;
  font-size: 0.8rem;
  color: var(--text-tertiary);
  font-family: var(--font-mono);
}

.apple-select-box select {
  width: 100%;
  appearance: none;
  border: none;
  background: transparent;
  padding: 0.5rem 1.8rem 0.5rem 0.75rem;
  font-family: var(--font-system);
  font-size: 0.85rem;
  color: var(--text-primary);
  outline: none;
  cursor: pointer;
}

.select-icon {
  position: absolute;
  right: 0.65rem;
  width: 14px;
  height: 14px;
  color: var(--text-secondary);
  pointer-events: none;
}

/* Segmented Control (macOS Style) */
.segmented-control {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: 1fr;
  background: var(--bg-input);
  padding: 2px;
  border-radius: var(--radius-sm);
  gap: 2px;
}

.segment-tab {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
}

.segment-tab input[type="radio"] {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.segment-tab span {
  width: 100%;
  text-align: center;
  padding: 0.35rem 0.4rem;
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--text-secondary);
  border-radius: calc(var(--radius-sm) - 2px);
  transition: all 0.15s ease;
}

.segment-tab input[type="radio"]:checked + span {
  background: var(--bg-surface);
  color: var(--text-primary);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.12);
  font-weight: 600;
}

/* Range Slider */
.slider-header-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.slider-val {
  font-size: 0.75rem;
  font-family: var(--font-mono);
  color: var(--text-secondary);
  font-weight: 500;
}

.apple-slider {
  width: 100%;
  accent-color: var(--accent-color);
  cursor: pointer;
}

.hairline-divider {
  height: 1px;
  background: var(--border-hairline);
  margin: 0.25rem 0;
}

/* Summary Meta */
.doc-summary {
  display: flex;
  justify-content: space-between;
  background: var(--bg-input);
  border-radius: var(--radius-sm);
  padding: 0.65rem 0.85rem;
}

.summary-item {
  display: flex;
  flex-direction: column;
}

.summary-label {
  font-size: 0.68rem;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.summary-value {
  font-size: 0.85rem;
  font-weight: 600;
  font-family: var(--font-mono);
}

/* Buttons */
.export-actions {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.apple-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
  font-family: var(--font-system);
  font-size: 0.85rem;
  font-weight: 500;
  border-radius: var(--radius-sm);
  border: none;
  padding: 0.6rem 1rem;
  cursor: pointer;
  transition: all 0.15s ease;
  outline: none;
}

.apple-btn svg {
  width: 15px;
  height: 15px;
  stroke-width: 2px;
}

.apple-btn:active:not(:disabled) {
  transform: scale(0.98);
}

.apple-btn-primary {
  background: var(--accent-color);
  color: white;
  font-weight: 600;
}

.apple-btn-primary:hover:not(:disabled) {
  background: var(--accent-hover);
}

.apple-btn-secondary {
  background: var(--bg-input);
  color: var(--text-primary);
}

.apple-btn-secondary:hover:not(:disabled) {
  background: var(--bg-input-hover);
}

.apple-btn-ghost {
  background: transparent;
  color: var(--text-secondary);
}

.apple-btn-ghost:hover:not(:disabled) {
  background: var(--bg-input);
  color: var(--text-primary);
}

.apple-btn-sm {
  padding: 0.35rem 0.65rem;
  font-size: 0.75rem;
}

.apple-btn-lg {
  padding: 0.75rem 1.25rem;
  font-size: 0.9rem;
}

.text-danger:hover {
  color: var(--text-danger) !important;
}

.apple-btn:disabled {
  opacity: 0.35;
  cursor: not-allowed;
  transform: none !important;
}

/* Modals */
.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(10px);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
}

.modal-pane {
  background: var(--bg-surface);
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-lg);
  max-width: 90vw;
  max-height: 88vh;
  width: 680px;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}

.modal-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 1.25rem;
  border-bottom: 1px solid var(--border-hairline);
}

.modal-title {
  font-size: 0.9rem;
  font-weight: 600;
}

.modal-close {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  width: 24px;
  height: 24px;
  border-radius: var(--radius-pill);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
}

.modal-close:hover {
  background: var(--bg-input);
  color: var(--text-primary);
}

.modal-close svg {
  width: 14px;
  height: 14px;
}

.modal-view {
  padding: 1.25rem;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: auto;
  background: #000000;
  min-height: 250px;
}

.modal-view img {
  max-width: 100%;
  max-height: 60vh;
  object-fit: contain;
  transition: transform 0.2s var(--ease-apple);
}

.modal-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 1.25rem;
  border-top: 1px solid var(--border-hairline);
}

.meta-label {
  font-size: 0.75rem;
  color: var(--text-secondary);
  font-family: var(--font-mono);
}

/* Progress Overlay */
.progress-dialog {
  background: var(--bg-surface);
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-lg);
  padding: 2rem;
  text-align: center;
  max-width: 360px;
  width: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.85rem;
  box-shadow: var(--shadow-lg);
}

.apple-spinner {
  width: 32px;
  height: 32px;
  border: 2.5px solid var(--border-hairline);
  border-top-color: var(--accent-color);
  border-radius: var(--radius-pill);
  animation: spin 0.8s linear infinite;
}

.progress-text {
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.progress-track {
  width: 100%;
  height: 4px;
  background: var(--bg-input);
  border-radius: var(--radius-pill);
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: var(--accent-color);
  transition: width 0.2s ease;
}

/* Apple Toast */
.apple-toast {
  position: fixed;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-hairline);
  box-shadow: var(--shadow-lg);
  color: var(--text-primary);
  padding: 0.6rem 1.15rem;
  border-radius: var(--radius-pill);
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.82rem;
  font-weight: 500;
  z-index: 2000;
}

.apple-toast svg {
  width: 15px;
  height: 15px;
  color: var(--accent-color);
  stroke-width: 2.2px;
}

.app-footer {
  text-align: center;
  padding: 2rem 0 1rem;
  font-size: 0.78rem;
  margin-top: auto;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.footer-privacy {
  color: var(--text-tertiary);
}

.footer-credit {
  color: var(--text-secondary);
  font-weight: 400;
}

.footer-author-link {
  color: var(--text-primary);
  font-weight: 500;
  text-decoration: none;
  border-bottom: 1px solid var(--border-hairline);
  transition: all 0.15s ease;
}

/* ==========================================================================
   SEO FAQ & Info Section (Apple Collapsible Details)
   ========================================================================== */
.seo-info-container {
  margin-top: 1.5rem;
  background: var(--bg-surface);
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.seo-info-header h2 {
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: -0.015em;
  color: var(--text-primary);
}

.faq-accordion {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.faq-item {
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-sm);
  background: var(--bg-input);
  overflow: hidden;
  transition: background-color 0.15s ease;
}

.faq-item[open] {
  background: var(--bg-surface);
}

.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 1rem;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-primary);
  cursor: pointer;
  list-style: none;
  user-select: none;
}

.faq-question::-webkit-details-marker {
  display: none;
}

.faq-chevron {
  width: 14px;
  height: 14px;
  color: var(--text-secondary);
  transition: transform 0.2s var(--ease-apple);
}

.faq-item[open] .faq-chevron {
  transform: rotate(180deg);
}

.faq-answer {
  padding: 0 1rem 0.85rem;
  font-size: 0.82rem;
  color: var(--text-secondary);
  line-height: 1.5;
  border-top: 1px solid var(--border-hairline);
  padding-top: 0.65rem;
}

.card-exit {
  opacity: 0 !important;
  transform: scale(0.95) !important;
  transition: all 0.15s ease !important;
}

.hidden {
  display: none !important;
}

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