/* ============================================================
   图片相似度检索系统 — 前端样式
   ============================================================ */

/* === CSS 变量 === */
:root {
  --color-bg: #f1f5f9;
  --color-surface: #ffffff;
  --color-border: #e2e8f0;
  --color-text: #1e293b;
  --color-text-secondary: #64748b;
  --color-primary: #2563eb;
  --color-primary-hover: #1d4ed8;
  --color-primary-light: #eff6ff;
  --color-success: #10b981;
  --color-success-bg: #ecfdf5;
  --color-warning: #f59e0b;
  --color-warning-bg: #fffbeb;
  --color-danger: #ef4444;
  --color-danger-bg: #fef2f2;
  --radius: 8px;
  --radius-lg: 12px;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.1), 0 1px 2px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.07), 0 2px 4px rgba(0, 0, 0, 0.06);
  --transition: 150ms ease;
}

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

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Microsoft YaHei", sans-serif;
  background: var(--color-bg);
  color: var(--color-text);
  min-height: 100vh;
  line-height: 1.6;
}

/* === Header === */
.header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 24px;
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-left {
  display: flex;
  align-items: center;
  gap: 12px;
}

.header-title {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--color-text);
}

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

/* === Main Layout === */
.main {
  display: flex;
  gap: 20px;
  padding: 20px 24px;
  max-width: 1400px;
  margin: 0 auto;
  min-height: calc(100vh - 60px);
}

.sidebar {
  width: 340px;
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.content {
  flex: 1;
  min-width: 0;
}

/* === Card === */
.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 20px;
  box-shadow: var(--shadow-sm);
}

.card-title {
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 14px;
  color: var(--color-text);
}

/* === Upload Zone === */
.upload-zone {
  border: 2px dashed var(--color-border);
  border-radius: var(--radius);
  padding: 28px 20px;
  text-align: center;
  cursor: pointer;
  transition: border-color var(--transition), background var(--transition);
  position: relative;
  min-height: 140px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.upload-zone:hover,
.upload-zone.drag-over {
  border-color: var(--color-primary);
  background: var(--color-primary-light);
}

.upload-icon {
  color: var(--color-text-secondary);
  margin-bottom: 10px;
  transition: color var(--transition);
}

.upload-zone:hover .upload-icon,
.upload-zone.drag-over .upload-icon {
  color: var(--color-primary);
}

.upload-text {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
}

.upload-link {
  color: var(--color-primary);
  font-weight: 500;
}

.upload-hint {
  font-size: 0.75rem;
  color: var(--color-text-secondary);
  margin-top: 6px;
  opacity: 0.7;
}

.preview-container {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-surface);
  border-radius: var(--radius);
  overflow: hidden;
}

.preview-container img {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
}

.preview-remove {
  position: absolute;
  top: 8px;
  right: 8px;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: rgba(0, 0, 0, 0.6);
  color: #fff;
  border: none;
  font-size: 1.2rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background var(--transition);
}

.preview-remove:hover {
  background: var(--color-danger);
}

/* === Controls === */
.params-card,
.actions-card {
  /* shared card styles */
}

.param-group {
  margin-bottom: 16px;
}

.param-label {
  display: block;
  font-size: 0.85rem;
  color: var(--color-text-secondary);
  margin-bottom: 6px;
}

.param-label strong {
  color: var(--color-primary);
  font-size: 1rem;
}

.slider-row {
  display: flex;
  align-items: center;
  gap: 10px;
}

.slider-min,
.slider-max {
  font-size: 0.75rem;
  color: var(--color-text-secondary);
  width: 24px;
  text-align: center;
}

.slider {
  flex: 1;
  -webkit-appearance: none;
  appearance: none;
  height: 6px;
  border-radius: 3px;
  background: var(--color-border);
  outline: none;
}

.slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--color-primary);
  cursor: pointer;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition);
}

.slider::-webkit-slider-thumb:hover {
  transform: scale(1.15);
}

.input-number {
  width: 100%;
  padding: 8px 12px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  font-size: 0.9rem;
  outline: none;
  transition: border-color var(--transition);
}

.input-number:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

/* === Buttons === */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 10px 20px;
  border: 1px solid transparent;
  border-radius: var(--radius);
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition);
  line-height: 1.4;
}

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

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

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

.btn-outline {
  background: var(--color-surface);
  border-color: var(--color-border);
  color: var(--color-text);
}

.btn-outline:hover:not(:disabled) {
  background: var(--color-bg);
  border-color: var(--color-text-secondary);
}

.btn-warn {
  color: var(--color-warning);
}

.btn-warn:hover:not(:disabled) {
  background: var(--color-warning-bg);
  border-color: var(--color-warning);
}

.btn-block {
  display: flex;
  width: 100%;
}

.btn-sm {
  padding: 6px 14px;
  font-size: 0.8rem;
}

.btn-text,
.btn-spinner {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.spinner {
  animation: spin 0.8s linear infinite;
}

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

/* === Action Row === */
.action-row {
  display: flex;
  gap: 8px;
}

/* === Empty State === */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 80px 20px;
  color: var(--color-text-secondary);
  gap: 12px;
}

.empty-state p {
  font-size: 0.95rem;
}

/* === Results Header === */
.results-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
  padding: 0 4px;
}

.results-count {
  font-size: 1.1rem;
  font-weight: 600;
}

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

/* === Results Grid === */
.results-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 14px;
}

.result-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  cursor: pointer;
  transition: transform var(--transition), box-shadow var(--transition);
  box-shadow: var(--shadow-sm);
}

.result-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.result-thumb {
  width: 100%;
  aspect-ratio: 1;
  object-fit: contain;
  background: #f8fafc;
  border-bottom: 1px solid var(--color-border);
}

.result-body {
  padding: 10px 12px;
}

.result-filename {
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--color-text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  margin-bottom: 4px;
}

.result-similarity {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 12px;
}

.sim-high {
  background: var(--color-success-bg);
  color: var(--color-success);
}

.sim-mid {
  background: var(--color-warning-bg);
  color: var(--color-warning);
}

.sim-low {
  background: var(--color-danger-bg);
  color: var(--color-danger);
}

/* === Modal === */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  animation: fadeIn 0.2s ease;
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

.modal {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  width: 90vw;
  max-width: 900px;
  max-height: 90vh;
  overflow: auto;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.2);
  animation: slideUp 0.25s ease;
}

@keyframes slideUp {
  from {
    transform: translateY(20px);
    opacity: 0;
  }
  to {
    transform: translateY(0);
    opacity: 1;
  }
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  border-bottom: 1px solid var(--color-border);
}

.modal-header h3 {
  font-size: 1.1rem;
  font-weight: 600;
}

.modal-close {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  border: none;
  background: var(--color-bg);
  color: var(--color-text-secondary);
  font-size: 1.3rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background var(--transition);
}

.modal-close:hover {
  background: var(--color-border);
}

.modal-body {
  padding: 20px;
}

.compare-container {
  display: flex;
  align-items: center;
  gap: 20px;
}

.compare-side {
  flex: 1;
  text-align: center;
}

.compare-side img {
  max-width: 100%;
  max-height: 400px;
  object-fit: contain;
  border-radius: var(--radius);
  border: 1px solid var(--color-border);
}

.compare-label {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  margin-bottom: 10px;
}

.compare-divider {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
}

.compare-vs {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--color-text-secondary);
}

.compare-sim {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-primary);
}

/* === 拆分报告按钮 === */
.report-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-top: 20px;
  padding-top: 16px;
  border-top: 1px solid var(--color-border);
}

.report-hint {
  font-size: 0.78rem;
  color: var(--color-text-secondary);
  margin-left: auto;
}

/* === Toast === */
.toast-container {
  position: fixed;
  bottom: 20px;
  right: 20px;
  z-index: 2000;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.toast {
  padding: 12px 20px;
  border-radius: var(--radius);
  font-size: 0.85rem;
  font-weight: 500;
  box-shadow: var(--shadow-md);
  animation: slideIn 0.3s ease;
  min-width: 260px;
  max-width: 400px;
}

.toast.success {
  background: var(--color-success-bg);
  color: var(--color-success);
  border: 1px solid rgba(16, 185, 129, 0.3);
}

.toast.error {
  background: var(--color-danger-bg);
  color: var(--color-danger);
  border: 1px solid rgba(239, 68, 68, 0.3);
}

.toast.info {
  background: var(--color-primary-light);
  color: var(--color-primary);
  border: 1px solid rgba(37, 99, 235, 0.3);
}

@keyframes slideIn {
  from {
    transform: translateX(100%);
    opacity: 0;
  }
  to {
    transform: translateX(0);
    opacity: 1;
  }
}

/* === Responsive === */
@media (max-width: 900px) {
  .main {
    flex-direction: column;
  }

  .sidebar {
    width: 100%;
  }

  .results-grid {
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: 10px;
  }

  .compare-container {
    flex-direction: column;
  }

  .compare-divider {
    flex-direction: row;
  }
}

@media (max-width: 500px) {
  .header {
    padding: 10px 14px;
  }

  .header-title {
    font-size: 1rem;
  }

  .header-hint {
    display: none;
  }

  .main {
    padding: 12px;
  }

  .results-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}