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

:root {
  --bg: #0f1117;
  --surface: #1a1d27;
  --surface-hover: #222633;
  --border: #2a2e3d;
  --border-active: #0070c0;
  --text: #e4e6f0;
  --text-muted: #8b8fa3;
  --primary: #0070c0;
  --primary-hover: #005a9e;
  --success: #34c759;
  --success-hover: #2db84e;
  --danger: #ff3b30;
  --radius: 10px;
  --radius-sm: 6px;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  line-height: 1.5;
}

@keyframes spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

.app-container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 24px;
}

header {
  text-align: center;
  margin-bottom: 32px;
}

header h1 {
  font-size: 2rem;
  font-weight: 700;
  background: linear-gradient(135deg, #0070c0, #00a0e8);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.subtitle {
  color: var(--text-muted);
  margin-top: 6px;
  font-size: 0.95rem;
}

.main-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  align-items: start;
}

.panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
}

.panel label {
  display: block;
  font-weight: 600;
  font-size: 0.9rem;
  margin-bottom: 12px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-muted);
}

.hint {
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-bottom: 12px;
}

.hint code {
  background: var(--bg);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 0.8rem;
  color: var(--primary);
}

textarea {
  width: 100%;
  height: 320px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  padding: 14px;
  font-family: 'SF Mono', 'Fira Code', 'Consolas', monospace;
  font-size: 0.85rem;
  resize: vertical;
  line-height: 1.6;
  transition: border-color 0.2s;
}

textarea:focus {
  outline: none;
  border-color: var(--border-active);
}

textarea::placeholder {
  color: #4a4e5e;
}

.text-actions {
  display: flex;
  gap: 8px;
  margin-top: 10px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 8px 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface);
  color: var(--text);
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
}

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

.btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.btn-primary {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
}

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

.btn-success {
  background: var(--success);
  border-color: var(--success);
  color: #fff;
}

.btn-success:hover:not(:disabled) {
  background: var(--success-hover);
}

.btn-secondary {
  background: transparent;
}

.btn-icon {
  padding: 6px 12px;
}

.btn-large {
  padding: 14px 24px;
  font-size: 0.95rem;
  width: 100%;
}

/* Format Grid */
.format-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
}

.format-card {
  border: 2px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 10px;
  cursor: pointer;
  text-align: center;
  transition: all 0.2s;
  user-select: none;
}

.format-card:hover {
  border-color: var(--text-muted);
}

.format-card.selected {
  border-color: var(--primary);
  background: rgba(0, 112, 192, 0.08);
}

.format-card span {
  display: block;
  margin-top: 8px;
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--text-muted);
}

.format-card.selected span {
  color: var(--primary);
}

/* Format Previews */
.format-preview {
  height: 56px;
  background: #fff;
  border-radius: 4px;
  padding: 8px;
  position: relative;
  overflow: hidden;
}

.fp-bar { height: 6px; background: #0070c0; border-radius: 2px; margin-bottom: 6px; width: 40%; }
.fp-title { height: 5px; background: #333; border-radius: 2px; margin-bottom: 5px; width: 60%; }
.fp-line { height: 3px; background: #ddd; border-radius: 2px; margin-bottom: 3px; width: 90%; }
.fp-line.short { width: 55%; }
.fp-header { height: 8px; background: #1a1a2e; margin: -8px -8px 6px -8px; }
.fp-footer { height: 6px; background: #1a1a2e; position: absolute; bottom: 0; left: 0; right: 0; }
.fp-bg { position: absolute; top: 0; right: 0; width: 40%; height: 100%; background: linear-gradient(135deg, #0070c0, #00a0e8); }
.fp-circle { width: 16px; height: 16px; background: #0070c0; border-radius: 50%; margin-bottom: 4px; }
.fp-topbar { height: 3px; background: linear-gradient(90deg, #2d3436, #636e72); margin: -8px -8px 6px -8px; }

.minimal-preview { display: flex; flex-direction: column; justify-content: center; align-items: flex-start; padding: 10px; }
.bold-preview { background: linear-gradient(135deg, #2d3436, #636e72); }
.bold-preview .fp-title { background: #fff; }
.bold-preview .fp-line { background: rgba(255,255,255,0.5); }
.corporate-preview { background: #fff; }
.creative-preview { display: flex; flex-direction: column; align-items: flex-start; background: linear-gradient(135deg, #0070c0, #00a0e8); }
.academic-preview { display: flex; flex-direction: column; }

/* Upload Card */
.format-card-upload {
  border-style: dashed;
  border-color: var(--text-muted);
}

.format-card-upload:hover {
  border-color: var(--primary);
}

.format-card-upload.selected {
  border-style: solid;
  border-color: var(--primary);
}

.upload-preview {
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg);
  color: var(--text-muted);
}

.format-card-upload.selected .upload-preview {
  color: var(--primary);
}

.upload-status {
  margin-top: 10px;
  font-size: 0.82rem;
  min-height: 20px;
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
}

.upload-status.success {
  color: var(--success);
}

.upload-status.error {
  color: var(--danger);
}

.upload-status.loading {
  color: var(--text-muted);
}

.upload-status .file-name {
  font-weight: 600;
  word-break: break-all;
}

.upload-status .remove-file {
  background: none;
  border: none;
  color: var(--danger);
  cursor: pointer;
  font-size: 0.82rem;
  text-decoration: underline;
  padding: 0;
  margin-left: 4px;
}

.upload-status .remove-file:hover {
  opacity: 0.7;
}

/* Drag over state */
.format-panel.drag-over {
  border-color: var(--primary);
  box-shadow: 0 0 0 2px rgba(0, 112, 192, 0.2);
}

.format-panel.drag-over .format-card-upload {
  border-color: var(--primary);
  background: rgba(0, 112, 192, 0.05);
}

/* Preview */
.preview-container {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  min-height: 360px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  position: relative;
}

.preview-placeholder {
  text-align: center;
  color: var(--text-muted);
}

.preview-placeholder svg {
  margin-bottom: 12px;
  opacity: 0.4;
}

.preview-placeholder p {
  font-size: 0.85rem;
}

.preview-slide {
  width: 100%;
  height: 100%;
  min-height: 360px;
  display: flex;
  flex-direction: column;
  padding: 32px;
  position: relative;
}

.preview-slide .slide-title {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 20px;
}

.preview-slide .slide-bullets {
  list-style: none;
}

.preview-slide .slide-bullets li {
  font-size: 0.88rem;
  padding: 5px 0;
  padding-left: 20px;
  position: relative;
  color: #ccc;
}

.preview-slide .slide-bullets li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 11px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
}

.preview-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  margin-top: 12px;
}

#slideCounter {
  font-size: 0.85rem;
  color: var(--text-muted);
  min-width: 60px;
  text-align: center;
}

.actions-panel {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: 16px;
  background: transparent;
  border: none;
  padding: 0;
}

/* Responsive */
@media (max-width: 1100px) {
  .format-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (max-width: 900px) {
  .main-layout {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 500px) {
  .app-container {
    padding: 12px;
  }
  .format-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* Scrollbar */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-muted); }