/* ========================================
   视频工厂 - 即梦风格单卡片布局
   ======================================== */

:root {
  --vf-bg: #0a0a0f;
  --vf-card: #12121a;
  --vf-border: #1e1e2e;
  --vf-text: #e4e4ea;
  --vf-text-muted: #71717a;
  --vf-brand: #6366f1;
  --vf-brand-active: #4f46e5;
  --vf-chip-bg: #1a1a26;
  --vf-chip-active-bg: rgba(99, 102, 241, 0.15);
  --vf-radius: 12px;
  --vf-space-sm: 8px;
  --vf-space-md: 16px;
  --vf-space-lg: 24px;
}

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

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

.vf-page {
  max-width: 720px;
  margin: 0 auto;
  padding: 20px 16px 40px;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* ── Header ── */
.vf-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 0 20px;
}

.vf-logo {
  display: flex;
  align-items: center;
  gap: 12px;
}

.vf-logo img {
  height: 40px;
  width: auto;
}

.vf-logo-text h1 {
  font-size: 18px;
  font-weight: 600;
  color: var(--vf-text);
  margin: 0;
}

.vf-logo-text .tagline {
  font-size: 11px;
  color: var(--vf-text-muted);
  margin: 0;
}

.vf-lang-btn {
  padding: 6px 14px;
  background: var(--vf-chip-bg);
  border: 1px solid var(--vf-border);
  border-radius: 16px;
  color: var(--vf-text-muted);
  font-size: 13px;
  cursor: pointer;
  transition: all 0.2s;
}

.vf-lang-btn:hover {
  border-color: var(--vf-brand);
  color: var(--vf-text);
}

/* ── Mode Switcher ── */
.vf-modes {
  display: flex;
  gap: 4px;
  margin-bottom: var(--vf-md);
  background: var(--vf-card);
  border: 1px solid var(--vf-border);
  border-radius: var(--vf-radius);
  padding: 4px;
}

.vf-mode-chip {
  flex: 1;
  padding: 8px 12px;
  background: transparent;
  border: none;
  border-radius: 8px;
  color: var(--vf-text-muted);
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
  white-space: nowrap;
}

.vf-mode-chip:hover {
  color: var(--vf-text);
  background: rgba(255,255,255,0.03);
}

.vf-mode-chip.active {
  background: var(--vf-brand);
  color: white;
  box-shadow: 0 2px 8px rgba(99,102,241,0.3);
}

/* ── Main Card ── */
.vf-card {
  background: var(--vf-card);
  border: 1px solid var(--vf-border);
  border-radius: var(--vf-radius);
  overflow: hidden;
  margin-bottom: var(--vf-space-lg);
}

/* ── Prompt Area ── */
.vf-prompt-area {
  padding: var(--vf-space-md);
}

.vf-prompt-label {
  font-size: 12px;
  color: var(--vf-text-muted);
  margin-bottom: 8px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.vf-optimize-btn {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px 10px;
  background: var(--vf-chip-bg);
  border: 1px solid var(--vf-border);
  border-radius: 14px;
  color: var(--vf-text-muted);
  font-size: 11px;
  cursor: pointer;
  transition: all 0.2s;
}

.vf-optimize-btn:hover {
  border-color: var(--vf-brand);
  color: var(--vf-brand);
}

.vf-textarea {
  width: 100%;
  min-height: 100px;
  padding: 12px;
  background: var(--vf-chip-bg);
  border: 1px solid var(--vf-border);
  border-radius: 8px;
  color: var(--vf-text);
  font-size: 14px;
  line-height: 1.6;
  resize: vertical;
  font-family: inherit;
  transition: all 0.2s;
}

.vf-textarea::placeholder {
  color: var(--vf-text-muted);
}

.vf-textarea:focus {
  outline: none;
  border-color: var(--vf-brand);
  background: rgba(99, 102, 241, 0.05);
}

/* ── Params Bar (inside card bottom) ── */
.vf-params-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  padding: 10px var(--vf-space-md);
  background: rgba(0,0,0,0.15);
  border-top: 1px solid var(--vf-border);
}

.vf-param-group {
  display: flex;
  gap: 3px;
  align-items: center;
}

.vf-param-group-label {
  font-size: 11px;
  color: var(--vf-text-muted);
  margin-right: 2px;
  flex-shrink: 0;
}

.vf-param-chip {
  padding: 4px 10px;
  background: var(--vf-chip-bg);
  border: 1px solid var(--vf-border);
  border-radius: 12px;
  color: var(--vf-text-muted);
  font-size: 11px;
  cursor: pointer;
  transition: all 0.15s;
  white-space: nowrap;
}

.vf-param-chip:hover {
  color: var(--vf-text);
  border-color: rgba(255,255,255,0.15);
}

.vf-param-chip.active {
  background: var(--vf-brand);
  border-color: var(--vf-brand);
  color: white;
}

/* ── Upload Area ── */
.vf-upload-area {
  padding: 0 var(--vf-space-md) var(--vf-space-md);
  display: none;
}

.vf-upload-area.visible {
  display: block;
}

.vf-upload-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  background: var(--vf-chip-bg);
  border: 1px dashed var(--vf-border);
  border-radius: 8px;
  color: var(--vf-text-muted);
  font-size: 12px;
  cursor: pointer;
  transition: all 0.2s;
}

.vf-upload-btn:hover {
  border-color: var(--vf-brand);
  color: var(--vf-brand);
}

.vf-img-previews {
  display: flex;
  gap: 8px;
  margin-top: 8px;
  flex-wrap: wrap;
}

.vf-thumb-mini {
  width: 60px;
  height: 60px;
  border-radius: 6px;
  object-fit: cover;
  border: 1px solid var(--vf-border);
  cursor: pointer;
}

.vf-clear-btn {
  background: none;
  border: none;
  color: var(--vf-text-muted);
  font-size: 16px;
  cursor: pointer;
  padding: 4px;
}

/* ── Generate Button ── */
.vf-action-row {
  padding: 0 var(--vf-space-md) var(--vf-space-md);
}

.vf-gen-btn {
  width: 100%;
  padding: 14px;
  background: linear-gradient(135deg, var(--vf-brand) 0%, var(--vf-brand-active) 100%);
  color: white;
  border: none;
  border-radius: 8px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}

.vf-gen-btn:hover:not(:disabled) {
  transform: translateY(-1px);
  box-shadow: 0 4px 16px rgba(99,102,241,0.4);
}

.vf-gen-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* ── Results ── */
.vf-results {
  margin-top: var(--vf-space-lg);
}

.vf-empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 48px 24px;
  text-align: center;
  color: var(--vf-text-muted);
  border: 1px dashed var(--vf-border);
  border-radius: var(--vf-radius);
  background: var(--vf-card);
}

.vf-empty-icon {
  width: 48px;
  height: 48px;
  margin-bottom: 12px;
  opacity: 0.4;
}

.vf-empty-text {
  font-size: 14px;
  color: var(--vf-text-muted);
}

/* ── Video Result Card ── */
.vf-video-card {
  background: var(--vf-card);
  border: 1px solid var(--vf-border);
  border-radius: var(--vf-radius);
  overflow: hidden;
  margin-bottom: var(--vf-space-md);
}

.vf-video-player {
  width: 100%;
  aspect-ratio: 16/9;
  background: #000;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
}

.vf-video-player video {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.vf-video-actions {
  padding: 12px;
  display: flex;
  justify-content: center;
  background: rgba(0,0,0,0.2);
}

.vf-download-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 20px;
  background: var(--vf-brand);
  color: white;
  border: none;
  border-radius: 6px;
  font-size: 13px;
  font-weight: 500;
  text-decoration: none;
  cursor: pointer;
  transition: all 0.2s;
}

.vf-download-btn:hover {
  background: var(--vf-brand-active);
  transform: translateY(-1px);
}

/* ── Progress ── */
.vf-progress-container {
  background: var(--vf-card);
  border: 1px solid var(--vf-border);
  border-radius: var(--vf-radius);
  padding: var(--vf-space-lg);
  text-align: center;
}

.vf-progress-bar-bg {
  width: 100%;
  height: 4px;
  background: var(--vf-chip-bg);
  border-radius: 2px;
  margin: 12px 0;
  overflow: hidden;
}

.vf-progress-bar-fill {
  height: 100%;
  background: var(--vf-brand);
  border-radius: 2px;
  transition: width 0.3s ease;
}

.vf-progress-info {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 8px;
  margin-bottom: 8px;
}

.vf-progress-percent {
  font-size: 18px;
  font-weight: 600;
  color: var(--vf-brand);
}

.vf-progress-separator {
  color: var(--vf-text-muted);
  font-size: 12px;
}

.vf-progress-time {
  font-size: 12px;
  color: var(--vf-text-muted);
}

.vf-progress-status {
  font-size: 13px;
  color: var(--vf-text-muted);
  margin-top: 4px;
}

/* ── Spinner ── */
.vf-spinner {
  width: 32px;
  height: 32px;
  border: 3px solid var(--vf-border);
  border-top-color: var(--vf-brand);
  border-radius: 50%;
  animation: vf-spin 0.8s linear infinite;
  margin: 0 auto 12px;
}

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

/* ── Status Messages ── */
.vf-status {
  padding: 8px 16px;
  border-radius: 6px;
  font-size: 13px;
  text-align: center;
  margin-top: var(--vf-space-md);
}

.vf-status.error {
  background: rgba(239, 68, 68, 0.1);
  border: 1px solid rgba(239, 68, 68, 0.3);
  color: #ef4444;
}

.vf-status.success {
  background: rgba(16, 185, 129, 0.1);
  border: 1px solid rgba(16, 185, 129, 0.3);
  color: #10b981;
}

/* ── Footer ── */
.vf-footer {
  margin-top: auto;
  text-align: center;
  padding: 24px 0;
  border-top: 1px solid var(--vf-border);
}

.vf-footer p {
  font-size: 12px;
  color: var(--vf-text-muted);
  margin: 0 0 8px;
}

.vf-footer-link {
  font-size: 12px;
  color: var(--vf-text-muted);
  text-decoration: none;
  transition: color 0.2s;
}

.vf-footer-link:hover {
  color: var(--vf-text);
}

/* ── Responsive ── */
@media (max-width: 600px) {
  .vf-modes {
    flex-wrap: wrap;
  }
  .vf-mode-chip {
    flex: 1 1 calc(50% - 2px);
    text-align: center;
    padding: 6px 8px;
    font-size: 12px;
  }
  .vf-params-bar {
    gap: 4px;
  }
  .vf-param-chip {
    padding: 3px 8px;
    font-size: 10px;
  }
}