/* ─── Reset & Base ─── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
:root {
  --bg-primary: #0f0f14;
  --bg-secondary: #1a1a24;
  --bg-card: #1e1e2e;
  --bg-card-hover: #252538;
  --bg-input: #2a2a3e;
  --border: #2d2d44;
  --border-focus: #6c5ce7;
  --text-primary: #e8e8f0;
  --text-secondary: #9898b0;
  --text-muted: #6868860;
  --accent: #6c5ce7;
  --accent-hover: #7c6cf7;
  --accent-glow: rgba(108, 92, 231, 0.3);
  --success: #00d68f;
  --success-bg: rgba(0, 214, 143, 0.15);
  --danger: #ff6b6b;
  --danger-bg: rgba(255, 107, 107, 0.15);
  --warning: #ffa502;
  --warning-bg: rgba(255, 165, 2, 0.15);
  --pink: #fd79a8;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 4px 24px rgba(0,0,0,0.3);
  --transition: 0.2s ease;
  --font: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
}

html { font-size: 15px; }
body {
  font-family: var(--font);
  background: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* ─── Header ─── */
.app-header {
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  padding: 1rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(12px);
}
.header-content h1 {
  font-size: 1.3rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--accent), var(--pink));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}
.subtitle {
  font-size: 0.8rem;
  color: var(--text-secondary);
  margin-top: 2px;
}
.header-actions { display: flex; gap: 0.5rem; }

/* ─── Buttons ─── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.55rem 1rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg-card);
  color: var(--text-primary);
  font-family: var(--font);
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition);
  white-space: nowrap;
}
.btn:hover { background: var(--bg-card-hover); border-color: var(--accent); }
.btn:active { transform: scale(0.97); }
.btn-primary {
  background: linear-gradient(135deg, var(--accent), #5a4bd1);
  border-color: var(--accent);
  color: #fff;
  box-shadow: 0 4px 16px var(--accent-glow);
}
.btn-primary:hover { background: linear-gradient(135deg, var(--accent-hover), #6a5be1); }
.btn-ghost { background: transparent; border-color: transparent; }
.btn-ghost:hover { background: var(--bg-card); }
.btn-sm { padding: 0.35rem 0.7rem; font-size: 0.78rem; }
.btn-danger { background: var(--danger-bg); border-color: var(--danger); color: var(--danger); }
.btn-danger:hover { background: var(--danger); color: #fff; }
.btn-copy { position: relative; overflow: hidden; }
.btn-copy.copied { background: var(--success-bg); border-color: var(--success); color: var(--success); }
.btn-copy.copied::after { content: '✓'; }
.btn-generate {
  width: 100%;
  padding: 1rem;
  font-size: 1.1rem;
  font-weight: 700;
  border-radius: var(--radius);
  margin-top: 0.5rem;
}
.btn-generate:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

/* ─── Layout ─── */
.main-content {
  display: flex;
  gap: 1.5rem;
  padding: 1.5rem;
  max-width: 1400px;
  margin: 0 auto;
}
.left-panel { flex: 0 0 420px; display: flex; flex-direction: column; gap: 1rem; }
.right-panel { flex: 1; min-width: 0; display: flex; flex-direction: column; gap: 1rem; }

/* ─── Cards ─── */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
  transition: border-color var(--transition);
}
.card:hover { border-color: rgba(108, 92, 231, 0.3); }
.card-title {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

/* ─── Upload Zone ─── */
.upload-zone {
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  padding: 2rem;
  text-align: center;
  cursor: pointer;
  transition: all var(--transition);
  background: var(--bg-input);
  position: relative;
}
.upload-zone:hover, .upload-zone.drag-over {
  border-color: var(--accent);
  background: rgba(108, 92, 231, 0.05);
}
.upload-zone.drag-over { transform: scale(1.01); }
.upload-icon { font-size: 2.5rem; display: block; margin-bottom: 0.5rem; }
.upload-hint { font-size: 0.75rem; color: var(--text-muted); margin-top: 0.3rem; }

/* ─── Thumbnail Grid ─── */
.thumbnail-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(70px, 80px));
  gap: 0.5rem;
  margin-top: 0.75rem;
}
.thumbnail-item {
  position: relative;
  aspect-ratio: 1;
  border-radius: var(--radius-sm);
  overflow: hidden;
  border: 2px solid var(--border);
  cursor: grab;
  transition: all var(--transition);
}
.thumbnail-item:hover { border-color: var(--accent); }
.thumbnail-item.analyzing { border-color: var(--warning); }
.thumbnail-item.analyzed { border-color: var(--success); }
.thumbnail-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.thumbnail-badge {
  position: absolute;
  top: 4px;
  left: 4px;
  background: var(--accent);
  color: #fff;
  font-size: 0.65rem;
  font-weight: 700;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
}
.thumbnail-remove {
  position: absolute;
  top: 4px;
  right: 4px;
  background: rgba(0,0,0,0.7);
  color: #fff;
  border: none;
  border-radius: 50%;
  width: 22px;
  height: 22px;
  font-size: 0.7rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity var(--transition);
}
.thumbnail-item:hover .thumbnail-remove { opacity: 1; }
.thumbnail-status {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 2px;
  text-align: center;
  font-size: 0.6rem;
  font-weight: 600;
}
.thumbnail-status.analyzing { background: var(--warning-bg); color: var(--warning); }
.thumbnail-status.done { background: var(--success-bg); color: var(--success); }

/* ─── Analysis Cards ─── */
.analysis-card {
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 1rem;
  margin-bottom: 0.75rem;
}
.analysis-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.75rem;
}
.analysis-thumb {
  width: 50px;
  height: 50px;
  object-fit: cover;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  flex-shrink: 0;
}
.analysis-edit-btn {
  cursor: pointer;
  font-size: 0.75rem;
  color: var(--accent);
  margin-left: 0.5rem;
}
.analysis-edit-btn:hover { text-decoration: underline; }
.analysis-row {
  display: flex;
  gap: 0.5rem;
  padding: 0.2rem 0;
  font-size: 0.85rem;
}
.analysis-row .label {
  color: var(--text-secondary);
  font-weight: 600;
  min-width: 80px;
}
.analysis-edit {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}
.analysis-edit .form-group {
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.analysis-edit input, .analysis-edit select {
  padding: 0.4rem 0.6rem;
  font-size: 0.85rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
}
.analysis-card h4 {
  font-size: 0.85rem;
  margin-bottom: 0.6rem;
  color: var(--accent);
}
.analysis-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.5rem;
}
.analysis-field {
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.analysis-field label {
  font-size: 0.7rem;
  color: var(--text-secondary);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}
.analysis-field input,
.analysis-field select {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.4rem 0.6rem;
  color: var(--text-primary);
  font-family: var(--font);
  font-size: 0.82rem;
}
.analysis-field input:focus,
.analysis-field select:focus {
  outline: none;
  border-color: var(--accent);
}

/* ─── Config Panel ─── */
.config-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
}
.config-item {
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.config-item label {
  font-size: 0.72rem;
  color: var(--text-secondary);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}
.config-item select,
.config-item input {
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.5rem 0.7rem;
  color: var(--text-primary);
  font-family: var(--font);
  font-size: 0.85rem;
  transition: border-color var(--transition);
}
.config-item select:focus,
.config-item input:focus {
  outline: none;
  border-color: var(--accent);
}
.hook-selector {
  margin-top: 0.75rem;
  padding-top: 0.75rem;
  border-top: 1px solid var(--border);
}
.hook-selector label {
  font-size: 0.75rem;
  color: var(--text-secondary);
  display: block;
  margin-bottom: 4px;
}
.hook-selector select {
  width: 100%;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.5rem;
  color: var(--text-primary);
  font-family: var(--font);
  font-size: 0.85rem;
}

/* ─── Progress ─── */
.progress-card {
  text-align: center;
  padding: 2rem;
}
.progress-content h3 { margin: 1rem 0 0.5rem; }
.progress-step { color: var(--text-secondary); font-size: 0.85rem; }
.spinner {
  width: 48px;
  height: 48px;
  border: 4px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 1s linear infinite;
  margin: 0 auto;
}
@keyframes spin { to { transform: rotate(360deg); } }
.progress-bar {
  width: 100%;
  height: 4px;
  background: var(--bg-input);
  border-radius: 2px;
  margin-top: 1rem;
  overflow: hidden;
}
.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent), var(--pink));
  border-radius: 2px;
  width: 0%;
  transition: width 0.5s ease;
}

/* ─── Segment Tabs ─── */
.segment-tabs {
  display: flex;
  gap: 0;
  border-bottom: 2px solid var(--border);
  margin-bottom: 1rem;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}
.segment-tab {
  padding: 0.6rem 1rem;
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--text-secondary);
  background: transparent;
  border: none;
  border-bottom: 2px solid transparent;
  cursor: pointer;
  transition: all var(--transition);
  white-space: nowrap;
  font-family: var(--font);
  margin-bottom: -2px;
}
.segment-tab:hover { color: var(--text-primary); }
.segment-tab.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
  font-weight: 600;
}

/* ─── Segment Content ─── */
.segment-panel { display: none; }
.segment-panel.active { display: block; }

.prompt-block {
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 1rem;
  margin-bottom: 0.75rem;
  position: relative;
}
.prompt-block-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.5rem;
}
.prompt-block-title {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--accent);
}
.prompt-text {
  font-size: 0.82rem;
  line-height: 1.7;
  color: var(--text-primary);
  white-space: pre-wrap;
  word-break: break-word;
  max-height: 200px;
  overflow-y: auto;
  padding-right: 0.5rem;
}
.prompt-text::-webkit-scrollbar { width: 4px; }
.prompt-text::-webkit-scrollbar-thumb { background: var(--border); border-radius: 2px; }

.info-row {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 0.5rem;
}
.info-item {
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.6rem 0.8rem;
  flex: 1;
  min-width: 200px;
}
.info-item h4 {
  font-size: 0.72rem;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 4px;
}
.info-item p {
  font-size: 0.82rem;
  color: var(--text-primary);
}

/* ─── Caption & Audio Sections ─── */
.caption-section,
.combined-audio-section {
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 1rem;
  margin-top: 1rem;
}
.section-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.6rem;
}
.section-header h3 { font-size: 0.9rem; font-weight: 600; }
.caption-text, .combined-audio-text {
  font-size: 0.85rem;
  line-height: 1.7;
  color: var(--text-primary);
}
.hashtag-text {
  margin-top: 0.4rem;
  font-size: 0.85rem;
  color: var(--accent);
  font-weight: 500;
}

/* ─── Output Actions ─── */
.output-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 1rem;
  flex-wrap: wrap;
  gap: 0.5rem;
}
.output-actions {
  display: flex;
  gap: 0.4rem;
  flex-wrap: wrap;
}

/* ─── Slide Panels ─── */
.slide-panel {
  position: fixed;
  top: 0;
  right: -440px;
  width: 420px;
  max-width: 90vw;
  height: 100vh;
  background: var(--bg-secondary);
  border-left: 1px solid var(--border);
  z-index: 200;
  transition: right 0.3s ease;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}
.slide-panel.open { right: 0; }
.panel-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--border);
}
.panel-header h2 { font-size: 1.1rem; }
.panel-body {
  flex: 1;
  overflow-y: auto;
  padding: 1rem 1.25rem;
}

.overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  z-index: 199;
  display: none;
  backdrop-filter: blur(4px);
}
.overlay.show { display: block; }

/* ─── History Items ─── */
.history-item {
  display: flex;
  gap: 0.75rem;
  padding: 0.75rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  margin-bottom: 0.6rem;
  cursor: pointer;
  transition: all var(--transition);
}
.history-item:hover { border-color: var(--accent); }
.history-thumb {
  width: 50px;
  height: 50px;
  border-radius: 6px;
  object-fit: cover;
  flex-shrink: 0;
}
.history-info { flex: 1; min-width: 0; }
.history-info h4 {
  font-size: 0.82rem;
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.history-info p { font-size: 0.72rem; color: var(--text-secondary); }
.history-actions { display: flex; flex-direction: column; gap: 0.3rem; }

/* ─── Preset Form & List ─── */
.preset-form {
  padding: 1rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 1rem;
}
.preset-form h3 { font-size: 0.9rem; margin-bottom: 0.75rem; }
.form-group { margin-bottom: 0.6rem; }
.form-group label {
  display: block;
  font-size: 0.72rem;
  color: var(--text-secondary);
  margin-bottom: 3px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}
.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.45rem 0.6rem;
  color: var(--text-primary);
  font-family: var(--font);
  font-size: 0.82rem;
}
.form-group textarea { resize: vertical; min-height: 60px; }
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus { outline: none; border-color: var(--accent); }

.preset-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.6rem 0.8rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  margin-bottom: 0.5rem;
}
.preset-item-info h4 { font-size: 0.85rem; font-weight: 600; }
.preset-item-info p { font-size: 0.72rem; color: var(--text-secondary); }
.preset-item-actions { display: flex; gap: 0.3rem; }

/* ─── Toast ─── */
.toast-container {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  z-index: 999;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}
.toast {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.7rem 1rem;
  font-size: 0.85rem;
  box-shadow: var(--shadow);
  animation: toastIn 0.3s ease;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.toast.success { border-color: var(--success); }
.toast.error { border-color: var(--danger); }
@keyframes toastIn { from { opacity: 0; transform: translateY(20px); } to { opacity: 1; transform: translateY(0); } }
.toast-exit { animation: toastOut 0.3s ease forwards; }
@keyframes toastOut { to { opacity: 0; transform: translateY(20px); } }

/* ─── Empty State ─── */
.empty-state {
  text-align: center;
  color: var(--text-muted);
  padding: 2rem;
  font-size: 0.85rem;
}

/* ─── 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); }

/* ─── Mobile Responsive ─── */
@media (max-width: 900px) {
  .main-content {
    flex-direction: column;
    padding: 1rem;
    gap: 1rem;
  }
  .left-panel { flex: none; width: 100%; }
  .right-panel { width: 100%; }
  .app-header { flex-direction: column; gap: 0.5rem; text-align: center; }
  .config-grid { grid-template-columns: 1fr; }
  .analysis-grid { grid-template-columns: 1fr; }
  .output-header { flex-direction: column; }
  .output-actions { width: 100%; justify-content: flex-start; }
  .info-row { flex-direction: column; }
  .info-item { min-width: 100%; }
  .slide-panel { width: 100%; right: -100%; }
  .segment-tabs { gap: 0; }
  .segment-tab { padding: 0.5rem 0.7rem; font-size: 0.75rem; }
}

@media (max-width: 480px) {
  html { font-size: 14px; }
  .app-header { padding: 0.75rem 1rem; }
  .header-content h1 { font-size: 1.1rem; }
  .card { padding: 1rem; }
  .upload-zone { padding: 1.5rem; }
  .thumbnail-grid { grid-template-columns: repeat(3, 1fr); }
}

/* ─── Animations ─── */
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
@keyframes slideUp { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: translateY(0); } }
.fade-in { animation: fadeIn 0.3s ease; }
.slide-up { animation: slideUp 0.4s ease; }

/* Analyze button */
.btn-analyze {
  width: 100%;
  margin-top: 0.75rem;
  padding: 0.7rem;
  font-size: 0.95rem;
  font-weight: 600;
  background: linear-gradient(135deg, #f59e0b, #d97706);
  color: #fff;
  border: none;
  border-radius: var(--radius);
  cursor: pointer;
  transition: all var(--transition);
}
.btn-analyze:hover { opacity: 0.9; transform: translateY(-1px); }
.btn-analyze:disabled { opacity: 0.5; cursor: not-allowed; transform: none; }

/* Analysis loading */
.analysis-loading {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem;
  font-size: 0.85rem;
  color: var(--text-secondary);
}
.mini-spinner {
  width: 16px;
  height: 16px;
  border: 2px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }