:root {
  --color-bg: #0f0f13;
  --color-surface: #1a1a22;
  --color-surface-raised: #22222e;
  --color-border: rgba(255, 255, 255, 0.1);
  --color-text-primary: #f0f0f0;
  --color-text-secondary: #9090a0;
  --color-accent: #6c63ff;
  --color-danger: #e94560;
  --color-success: #3ecf8e;

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;

  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 24px;
  --space-6: 32px;
  --space-7: 48px;

  --font-sans: system-ui, -apple-system, sans-serif;
  --font-mono: 'Courier New', monospace;

  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
}

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

html, body {
  height: 100%;
}

body {
  font-family: var(--font-sans);
  background-color: var(--color-bg);
  color: var(--color-text-primary);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

#app {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.app-loading {
  display: flex;
  align-items: center;
  justify-content: center;
  flex: 1;
  font-size: 1.5rem;
  color: var(--color-text-secondary);
  letter-spacing: 0.05em;
}

button {
  font-family: var(--font-sans);
  cursor: pointer;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  font-weight: 500;
  transition: opacity var(--transition-fast), background-color var(--transition-fast);
}

button:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

input[type='text'],
input[type='color'],
select,
textarea {
  font-family: var(--font-sans);
  font-size: 0.875rem;
  background-color: var(--color-surface-raised);
  color: var(--color-text-primary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  outline: none;
  transition: border-color var(--transition-fast);
}

input[type='text']:focus,
select:focus,
textarea:focus {
  border-color: var(--color-accent);
}

a {
  color: var(--color-accent);
  text-decoration: none;
}

.page-placeholder {
  display: flex;
  align-items: center;
  justify-content: center;
  flex: 1;
  min-height: 100vh;
  font-size: 1.5rem;
  color: var(--color-text-secondary);
}

.not-found {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  color: var(--color-danger);
}

/* Dashboard */
.dashboard {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.dashboard-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-5) var(--space-6);
  border-bottom: 1px solid var(--color-border);
  background-color: var(--color-surface);
}

.dashboard-title {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--color-text-primary);
  letter-spacing: 0.02em;
}

.dashboard-main {
  flex: 1;
  padding: var(--space-6);
}

.dashboard-empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-4);
  min-height: 40vh;
  color: var(--color-text-secondary);
  font-size: 1rem;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--space-5);
}

.card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: border-color var(--transition-base), transform var(--transition-base);
}

.card:hover {
  border-color: var(--color-accent);
  transform: translateY(-2px);
}

.card-thumb {
  height: 140px;
  background-color: var(--color-surface-raised);
  display: flex;
  align-items: center;
  justify-content: center;
}

.card-thumb-label {
  font-size: 3rem;
  font-weight: 700;
  color: var(--color-accent);
  opacity: 0.5;
  text-transform: uppercase;
}

.card-body {
  padding: var(--space-4);
  flex: 1;
}

.card-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-text-primary);
  margin-bottom: var(--space-1);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

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

.card-actions {
  display: flex;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-4);
  border-top: 1px solid var(--color-border);
}

.card-confirm {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-4);
  border-top: 1px solid var(--color-border);
  background-color: var(--color-surface-raised);
}

.card-confirm-text {
  flex: 1;
  font-size: 0.8rem;
  color: var(--color-text-secondary);
}

/* Buttons */
.btn-primary {
  background-color: var(--color-accent);
  color: #fff;
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  font-weight: 500;
}

.btn-primary:hover {
  opacity: 0.88;
}

.btn-ghost {
  background: transparent;
  color: var(--color-text-secondary);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-sm);
  font-size: 0.8rem;
  border: 1px solid var(--color-border);
}

.btn-ghost:hover {
  color: var(--color-text-primary);
  border-color: var(--color-text-secondary);
}

.btn-danger {
  background: transparent;
  color: var(--color-danger);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-sm);
  font-size: 0.8rem;
  border: 1px solid var(--color-danger);
}

.btn-danger:hover {
  background-color: var(--color-danger);
  color: #fff;
}

/* Editor */
.editor {
  display: flex;
  flex-direction: column;
  height: 100vh;
  overflow: hidden;
}

.editor-not-found {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-4);
  height: 100vh;
  color: var(--color-text-secondary);
}

.editor-header {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  padding: 0 var(--space-5);
  height: 56px;
  min-height: 56px;
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  flex-shrink: 0;
}

.editor-back {
  font-size: 0.8rem;
}

.editor-header-title {
  flex: 1;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--color-text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.editor-save-status {
  font-size: 0.75rem;
  color: var(--color-success);
  min-width: 48px;
  text-align: right;
}

.editor-body {
  display: flex;
  flex: 1;
  overflow: hidden;
}

.editor-panel {
  width: 320px;
  min-width: 320px;
  background-color: var(--color-surface);
  border-right: 1px solid var(--color-border);
  overflow-y: auto;
  display: flex;
  flex-direction: column;
}

.editor-section {
  padding: var(--space-4) var(--space-5);
  border-bottom: 1px solid var(--color-border);
}

.editor-section-label {
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-3);
}

.editor-workspace {
  flex: 1;
  overflow-y: auto;
  padding: var(--space-6);
  display: flex;
  align-items: center;
  justify-content: center;
}

.editor-placeholder-text {
  font-size: 0.85rem;
  color: var(--color-text-secondary);
}

/* JSON importer */
.form-textarea {
  width: 100%;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-sm);
  background-color: var(--color-surface-raised);
  color: var(--color-text-primary);
  border: 1px solid var(--color-border);
  font-size: 0.78rem;
  font-family: var(--font-mono);
  resize: vertical;
  outline: none;
  transition: border-color var(--transition-fast);
  line-height: 1.5;
}

.form-textarea:focus {
  border-color: var(--color-accent);
}

.import-status {
  font-size: 0.78rem;
  margin-top: var(--space-2);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-sm);
}

.import-status--valid {
  background-color: rgba(62, 207, 142, 0.12);
  color: var(--color-success);
}

.import-error-list {
  margin-top: var(--space-2);
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.import-error-item {
  font-size: 0.75rem;
  display: flex;
  flex-direction: column;
  gap: 1px;
  padding: var(--space-2) var(--space-3);
  background-color: rgba(233, 69, 96, 0.1);
  border-radius: var(--radius-sm);
  border-left: 2px solid var(--color-danger);
}

.import-error-loc {
  color: var(--color-danger);
  font-weight: 600;
  font-family: var(--font-mono);
}

.import-error-msg {
  color: var(--color-text-secondary);
}

.import-actions {
  display: flex;
  gap: var(--space-2);
  margin-top: var(--space-3);
}

/* Slide list */
.slide-list-empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  height: 100%;
  color: var(--color-text-secondary);
}

.slide-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  padding: var(--space-4);
  width: 100%;
}

.slide-row {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: border-color var(--transition-fast), background-color var(--transition-fast);
  user-select: none;
}

.slide-row:hover {
  border-color: var(--color-accent);
}

.slide-row--selected {
  border-color: var(--color-accent);
  background-color: var(--color-surface-raised);
}

.slide-row--dragging {
  opacity: 0.4;
}

.slide-row-handle {
  color: var(--color-text-secondary);
  font-size: 0.75rem;
  cursor: grab;
  letter-spacing: -2px;
}

.slide-row-index {
  font-size: 0.75rem;
  color: var(--color-text-secondary);
  min-width: 20px;
  text-align: right;
}

.slide-row-type {
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--color-accent);
  background-color: rgba(108, 99, 255, 0.12);
  padding: 2px var(--space-2);
  border-radius: var(--radius-sm);
  white-space: nowrap;
}

.slide-row-title {
  flex: 1;
  font-size: 0.85rem;
  color: var(--color-text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.slide-row-actions {
  display: flex;
  gap: var(--space-1);
  align-items: center;
  flex-shrink: 0;
}

.slide-row-delete {
  font-size: 0.75rem;
  padding: var(--space-1) var(--space-2);
  opacity: 0.5;
}

.slide-row-delete:hover {
  opacity: 1;
  color: var(--color-danger);
  border-color: var(--color-danger);
}

/* Form fields */
.form-field {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  margin-bottom: var(--space-3);
}

.form-field:last-child {
  margin-bottom: 0;
}

.form-label {
  font-size: 0.75rem;
  color: var(--color-text-secondary);
  font-weight: 500;
}

.form-input,
.form-select {
  width: 100%;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-sm);
  background-color: var(--color-surface-raised);
  color: var(--color-text-primary);
  border: 1px solid var(--color-border);
  font-size: 0.875rem;
  outline: none;
  transition: border-color var(--transition-fast);
}

.form-input:focus,
.form-select:focus {
  border-color: var(--color-accent);
}

.form-color-row {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin-top: var(--space-1);
}

.form-color {
  width: 36px;
  height: 36px;
  padding: 2px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
  background: none;
  cursor: pointer;
}

.form-color-label {
  font-size: 0.8rem;
  color: var(--color-text-secondary);
  font-family: var(--font-mono);
}

/* Segmented control */
.segmented {
  display: flex;
  gap: 2px;
  background-color: var(--color-surface-raised);
  border-radius: var(--radius-sm);
  padding: 2px;
  margin-bottom: var(--space-2);
}

.seg-btn {
  flex: 1;
  padding: var(--space-1) var(--space-2);
  border-radius: calc(var(--radius-sm) - 2px);
  font-size: 0.78rem;
  color: var(--color-text-secondary);
  background: transparent;
  border: none;
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

.seg-btn--active {
  background-color: var(--color-accent);
  color: #fff;
}

/* Slides */
.slide {
  width: 100%;
  height: 100%;
  display: flex;
  position: relative;
  overflow: hidden;
  font-family: var(--font-sans);
  box-sizing: border-box;
}

.slide--cover {
  align-items: center;
  justify-content: center;
  text-align: center;
}

.slide-cover-inner {
  padding: var(--space-7);
  max-width: 80%;
}

.slide-cover-title {
  font-size: clamp(2rem, 5vw, 4rem);
  font-weight: 700;
  line-height: 1.15;
  margin-bottom: var(--space-4);
}

.slide-cover-subtitle {
  font-size: clamp(1rem, 2.5vw, 1.75rem);
  font-weight: 400;
  opacity: 0.9;
}

.slide--text-bullets {
  align-items: center;
  justify-content: flex-start;
  padding: var(--space-7);
}

.slide-content {
  max-width: 80%;
}

.slide-title {
  font-size: clamp(1.5rem, 3.5vw, 2.75rem);
  font-weight: 700;
  margin-bottom: var(--space-5);
  line-height: 1.2;
}

.slide-bullets {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.slide-bullet {
  font-size: clamp(0.9rem, 2vw, 1.4rem);
  display: flex;
  align-items: baseline;
  gap: var(--space-2);
  line-height: 1.4;
}

.slide-bullet-marker {
  font-size: 0.7em;
  flex-shrink: 0;
}

.slide--image-text {
  display: flex;
  align-items: stretch;
}

.slide-image-wrap {
  flex: 1;
  overflow: hidden;
}

.slide-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.slide--image-text .slide-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: var(--space-7);
  max-width: 100%;
}

.slide-body {
  font-size: clamp(0.85rem, 1.8vw, 1.2rem);
  line-height: 1.6;
  opacity: 0.85;
}

.slide--fullscreen-image {
  align-items: flex-end;
  justify-content: center;
}

.slide-fullscreen-img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.slide-caption {
  position: relative;
  z-index: 1;
  font-size: clamp(0.8rem, 1.5vw, 1.1rem);
  padding: var(--space-3) var(--space-5);
  margin-bottom: var(--space-5);
  background: rgba(0, 0, 0, 0.45);
  border-radius: var(--radius-sm);
  backdrop-filter: blur(4px);
}