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

:root {
  --color-bg: #f5f7fa;
  --color-surface: #ffffff;
  --color-primary: #2563eb;
  --color-primary-hover: #1d4ed8;
  --color-primary-light: #dbeafe;
  --color-text: #1e293b;
  --color-text-secondary: #64748b;
  --color-border: #e2e8f0;
  --color-border-strong: #cbd5e1;
  --color-error: #dc2626;
  --color-error-bg: #fef2f2;
  --color-success: #16a34a;
  --color-success-bg: #f0fdf4;
  --color-dropzone-active: #2563eb;
  --radius: 8px;
  --radius-lg: 12px;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.07), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.04);
  --transition: 150ms ease;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  min-height: 100vh;
}

/* Header */
.header {
  text-align: center;
  padding: 2rem 1rem 1rem;
}

.header__title {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--color-text);
}

.header__subtitle {
  color: var(--color-text-secondary);
  font-size: 0.95rem;
  margin-top: 0.25rem;
}

/* Tabs */
.tabs {
  display: flex;
  justify-content: center;
  gap: 0.5rem;
  padding: 0 1rem;
  margin-bottom: 1.5rem;
}

.tabs__btn {
  padding: 0.625rem 1.5rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-surface);
  color: var(--color-text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition);
}

.tabs__btn:hover {
  background: var(--color-primary-light);
  color: var(--color-primary);
  border-color: var(--color-primary);
}

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

.tabs__btn--active:hover {
  background: var(--color-primary-hover);
  color: #fff;
}

/* Main */
.main {
  max-width: 720px;
  margin: 0 auto;
  padding: 0 1rem 3rem;
}

/* Tab Panels */
.tab-panel {
  display: none;
}

.tab-panel--active {
  display: block;
}

/* Card */
.card {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  padding: 2rem;
}

.card__title {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 0.375rem;
}

.card__desc {
  color: var(--color-text-secondary);
  font-size: 0.9rem;
  margin-bottom: 1.5rem;
}

/* Dropzone */
.dropzone {
  border: 2px dashed var(--color-border-strong);
  border-radius: var(--radius);
  padding: 2.5rem 1.5rem;
  text-align: center;
  transition: all var(--transition);
  cursor: pointer;
  position: relative;
}

.dropzone:hover {
  border-color: var(--color-primary);
  background: var(--color-primary-light);
}

.dropzone--active {
  border-color: var(--color-dropzone-active);
  background: var(--color-primary-light);
  border-style: solid;
}

.dropzone__icon {
  width: 40px;
  height: 40px;
  color: var(--color-text-secondary);
  margin-bottom: 0.75rem;
}

.dropzone--active .dropzone__icon {
  color: var(--color-primary);
}

.dropzone__text {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--color-text);
  margin-bottom: 0.25rem;
}

.dropzone__hint {
  font-size: 0.8rem;
  color: var(--color-text-secondary);
  margin-bottom: 1rem;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.625rem 1.25rem;
  border-radius: var(--radius);
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition);
  border: none;
}

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

.btn--primary {
  background: var(--color-primary);
  color: #fff;
  margin-top: 1.25rem;
}

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

.btn--secondary {
  background: var(--color-bg);
  color: var(--color-text);
  border: 1px solid var(--color-border);
}

.btn--secondary:hover {
  background: var(--color-border);
}

.btn--toggle {
  width: 100%;
  padding: 0.5rem 0.75rem;
  background: var(--color-primary);
  color: #fff;
  border: 1px solid var(--color-primary);
  border-radius: var(--radius);
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition);
}

.btn--toggle:hover {
  background: var(--color-primary-hover);
  border-color: var(--color-primary-hover);
}

/* File Info */
.file-info {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-top: 1rem;
  padding: 0.625rem 1rem;
  background: var(--color-primary-light);
  border-radius: var(--radius);
  font-size: 0.875rem;
}

.file-info[hidden] {
  display: none;
}

.file-info__name {
  flex: 1;
  font-weight: 500;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.file-info__remove {
  background: none;
  border: none;
  font-size: 1.25rem;
  color: var(--color-text-secondary);
  cursor: pointer;
  line-height: 1;
  padding: 0.125rem 0.375rem;
  border-radius: 4px;
}

.file-info__remove:hover {
  background: rgba(0, 0, 0, 0.08);
  color: var(--color-error);
}

/* Config */
.config {
  margin-top: 1.5rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--color-border);
}

.config__title {
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
}

.config__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 1rem;
}

.config__field label {
  display: block;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  margin-bottom: 0.25rem;
}

.config__field input,
.config__field select {
  width: 100%;
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  font-size: 0.875rem;
  background: var(--color-surface);
  color: var(--color-text);
  transition: border-color var(--transition);
}

.config__field input:focus,
.config__field select:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

/* Progress */
.progress {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-top: 1.25rem;
  padding: 1rem;
  background: var(--color-primary-light);
  border-radius: var(--radius);
}

.progress__text {
  font-size: 0.875rem;
  color: var(--color-primary);
  font-weight: 500;
}

/* Spinner */
.spinner {
  width: 22px;
  height: 22px;
  border: 3px solid var(--color-primary-light);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  flex-shrink: 0;
}

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

/* Error */
.error-msg {
  margin-top: 1.25rem;
  padding: 0.875rem 1rem;
  background: var(--color-error-bg);
  color: var(--color-error);
  border-radius: var(--radius);
  font-size: 0.875rem;
  font-weight: 500;
  border-left: 3px solid var(--color-error);
}

/* Result */
.result {
  margin-top: 1.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--color-border);
}

.result__title {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-success);
  margin-bottom: 0.375rem;
}

.result__meta {
  font-size: 0.85rem;
  color: var(--color-text-secondary);
  margin-bottom: 1rem;
}

.result__preview {
  margin-bottom: 1rem;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--color-border);
}

.result__preview iframe {
  width: 100%;
  height: 500px;
  border: none;
}

/* Frame Grid */
.frame-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 1rem;
  margin-top: 0.5rem;
}

.frame-card {
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--color-surface);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition);
}

.frame-card:hover {
  box-shadow: var(--shadow-lg);
}

.frame-card__img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  display: block;
  background: var(--color-bg);
}

.frame-card__info {
  padding: 0.625rem 0.75rem;
}

.frame-card__label {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 0.125rem;
}

.frame-card__detail {
  font-size: 0.75rem;
  color: var(--color-text-secondary);
  line-height: 1.4;
}

/* Jobs History */
.jobs-history {
  max-width: 720px;
  margin: 0 auto 1.5rem;
  padding: 0 1rem;
}

.jobs-history__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.75rem;
}

.jobs-history__title {
  font-size: 1rem;
  font-weight: 600;
}

.btn--sm {
  padding: 0.375rem 0.75rem;
  font-size: 0.8rem;
  margin-top: 0;
}

.jobs-history__list {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.job-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.625rem 1rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  cursor: pointer;
  transition: all var(--transition);
  font-size: 0.85rem;
}

.job-item:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-sm);
}

.job-item__type {
  font-weight: 600;
  color: var(--color-primary);
  white-space: nowrap;
}

.job-item__id {
  color: var(--color-text-secondary);
  font-family: monospace;
  font-size: 0.75rem;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  flex: 1;
}

.job-item__status {
  padding: 0.125rem 0.5rem;
  border-radius: 9999px;
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  white-space: nowrap;
}

.job-item__status--processing {
  background: var(--color-primary-light);
  color: var(--color-primary);
}

.job-item__status--completed {
  background: var(--color-success-bg);
  color: var(--color-success);
}

.job-item__status--failed {
  background: var(--color-error-bg);
  color: var(--color-error);
}

.job-item__time {
  color: var(--color-text-secondary);
  font-size: 0.75rem;
  white-space: nowrap;
}

/* Iteration Gallery */
.iteration-gallery {
  margin-top: 1.5rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--color-border);
}

.iteration-gallery__title {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 0.25rem;
}

.iteration-gallery__desc {
  font-size: 0.8rem;
  color: var(--color-text-secondary);
  margin-bottom: 1rem;
}

.iteration-gallery__timeline {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin-bottom: 1rem;
}

.iteration-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  padding: 0.5rem 0.875rem;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  font-size: 0.8rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition);
}

.iteration-chip:hover {
  border-color: var(--color-primary);
  background: var(--color-primary-light);
  color: var(--color-primary);
}

.iteration-chip--active {
  background: var(--color-primary);
  color: #fff;
  border-color: var(--color-primary);
}

.iteration-chip__size {
  font-size: 0.7rem;
  opacity: 0.7;
}

.iteration-gallery__preview {
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
}

.iteration-gallery__preview-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.625rem 1rem;
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  font-size: 0.85rem;
  font-weight: 500;
}

.iteration-gallery__preview-frame iframe {
  width: 100%;
  height: 450px;
  border: none;
}

/* Group Timeline */
.timeline {
  margin-bottom: 1.5rem;
}

.timeline__title {
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.timeline__bar {
  display: flex;
  height: 32px;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--color-border);
}

.timeline__segment {
  height: 100%;
  position: relative;
  transition: opacity var(--transition);
  cursor: pointer;
  min-width: 1px;
}

.timeline__segment:hover {
  opacity: 0.8;
}

.timeline__segment-tooltip {
  display: none;
  position: absolute;
  bottom: calc(100% + 6px);
  left: 50%;
  transform: translateX(-50%);
  background: var(--color-text);
  color: #fff;
  font-size: 0.7rem;
  padding: 0.25rem 0.5rem;
  border-radius: 4px;
  white-space: nowrap;
  pointer-events: none;
  z-index: 10;
}

.timeline__segment:hover .timeline__segment-tooltip {
  display: block;
}

.timeline__legend {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 0.5rem;
}

.timeline__legend-item {
  display: flex;
  align-items: center;
  gap: 0.375rem;
  font-size: 0.75rem;
  color: var(--color-text-secondary);
}

.timeline__legend-swatch {
  width: 12px;
  height: 12px;
  border-radius: 3px;
  flex-shrink: 0;
}

/* Chat Section */
.chat-section {
  margin-top: 1.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--color-border);
}

.chat-section__title {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 1rem;
}

/* Chat History */
.chat-history {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.chat-empty {
  text-align: center;
  color: var(--color-text-secondary);
  font-size: 0.875rem;
  padding: 2rem;
}

.chat-msg {
  border-radius: var(--radius);
  padding: 0.75rem 1rem;
  border: 1px solid var(--color-border);
}

.chat-msg--reconstructor {
  background: var(--color-primary-light);
  border-color: #bfdbfe;
}

.chat-msg--analyzer {
  background: var(--color-success-bg);
  border-color: #bbf7d0;
}

.chat-msg__header {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.375rem;
  flex-wrap: wrap;
}

.chat-msg__agent {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.chat-msg--reconstructor .chat-msg__agent {
  color: var(--color-primary);
}

.chat-msg--analyzer .chat-msg__agent {
  color: var(--color-success);
}

.chat-msg__tool {
  font-size: 0.7rem;
  font-weight: 600;
  font-family: monospace;
  background: rgba(255, 255, 255, 0.7);
  padding: 0.1rem 0.45rem;
  border-radius: 4px;
  color: var(--color-text);
}

.chat-msg__time {
  font-size: 0.7rem;
  color: var(--color-text-secondary);
  margin-left: auto;
}

.chat-msg__body {
  font-size: 0.875rem;
  color: var(--color-text);
  white-space: pre-wrap;
  word-break: break-word;
  line-height: 1.5;
}

/* Responsive */
@media (max-width: 600px) {
  .header {
    padding: 1.5rem 1rem 0.75rem;
  }

  .header__title {
    font-size: 1.35rem;
  }

  .card {
    padding: 1.25rem;
  }

  .dropzone {
    padding: 2rem 1rem;
  }

  .config__grid {
    grid-template-columns: 1fr;
  }

  .frame-grid {
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  }

  .result__preview iframe {
    height: 350px;
  }
}