/* ============================================================
   人像分割网页应用 - 全局样式（极简风格）
   ============================================================ */

/* ---- CSS 变量（设计令牌） ---- */
:root {
  --color-bg: #fafaf9;
  --color-surface: #ffffff;
  --color-primary: #4f46e5;
  --color-primary-hover: #4338ca;
  --color-primary-light: #eef2ff;
  --color-text: #1e293b;
  --color-text-secondary: #64748b;
  --color-text-muted: #94a3b8;
  --color-border: #e2e8f0;
  --color-border-hover: #cbd5e1;
  --color-error: #ef4444;
  --color-error-bg: #fef2f2;
  --color-success: #22c55e;
  --color-success-bg: #f0fdf4;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --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, 0.05);
  --transition: 200ms ease;
}

/* ---- 全局重置 ---- */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 40px 20px 80px;
}

/* ---- 页面容器 ---- */
.container {
  width: 100%;
  max-width: 520px;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

/* ---- 顶部标题 ---- */
.header {
  text-align: center;
  margin-bottom: 8px;
}

.title {
  font-size: 28px;
  font-weight: 700;
  color: var(--color-text);
  letter-spacing: -0.02em;
  margin-bottom: 6px;
}

.subtitle {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.5;
}

/* ---- 功能模式选择器 ---- */
.mode-selector {
  display: flex;
  gap: 10px;
  justify-content: center;
  margin-top: 16px;
}

.mode-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 18px;
  border: 1px solid var(--color-border);
  border-radius: 24px;
  background: var(--color-surface);
  color: var(--color-text-secondary);
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition);
  font-family: inherit;
}

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

.mode-btn.active {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: #ffffff;
}

.mode-icon {
  font-size: 15px;
}

/* ---- 卡片容器 ---- */
.card {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  border: 1px solid var(--color-border);
  padding: 32px;
  transition: box-shadow var(--transition);
}

/* ---- 上传区域 ---- */
.upload-area {
  border: 2px dashed var(--color-border);
  border-radius: var(--radius-md);
  padding: 48px 24px;
  text-align: center;
  cursor: pointer;
  transition: all var(--transition);
  background-color: #f8fafc;
}

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

.upload-area.drag-over {
  border-color: var(--color-primary);
  background-color: var(--color-primary-light);
  transform: scale(1.01);
}

.upload-icon {
  color: var(--color-text-muted);
  margin-bottom: 16px;
  transition: color var(--transition);
}

.upload-area:hover .upload-icon {
  color: var(--color-primary);
}

.upload-text {
  font-size: 16px;
  font-weight: 500;
  color: var(--color-text);
  margin-bottom: 6px;
}

.upload-hint {
  font-size: 12px;
  color: var(--color-text-muted);
}

/* ---- 本地预览区 ---- */
.local-preview {
  text-align: center;
}

.local-preview img {
  width: 100%;
  max-height: 360px;
  object-fit: contain;
  border-radius: var(--radius-sm);
  background-color: #f1f5f9;
  margin-bottom: 20px;
}

.preview-actions {
  display: flex;
  gap: 12px;
  justify-content: center;
}

/* ---- 按钮通用样式 ---- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 24px;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition);
  font-family: inherit;
  line-height: 1.4;
}

.btn:active {
  transform: scale(0.97);
}

.btn-primary {
  background-color: var(--color-primary);
  color: #ffffff;
  min-width: 140px;
}

.btn-primary:hover {
  background-color: var(--color-primary-hover);
  box-shadow: var(--shadow-md);
}

.btn-primary:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

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

.btn-outline:hover {
  border-color: var(--color-border-hover);
  background-color: #f8fafc;
  color: var(--color-text);
}

.btn-download {
  background-color: #0f172a;
  color: #ffffff;
  padding: 12px 24px;
  font-weight: 600;
  white-space: nowrap;
}

.btn-download:hover {
  background-color: #1e293b;
  box-shadow: var(--shadow-md);
}

.btn-download:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

/* ---- 按钮内旋转动画 ---- */
.btn-spinner svg {
  animation: spin 0.8s linear infinite;
}

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

/* ---- 处理中卡片 ---- */
.processing-card {
  text-align: center;
  padding: 48px 32px;
}

.processing-animation {
  margin-bottom: 20px;
}

.spinner {
  width: 40px;
  height: 40px;
  border: 3px solid var(--color-border);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
  margin: 0 auto;
}

.processing-text {
  font-size: 16px;
  font-weight: 500;
  color: var(--color-text);
  margin-bottom: 6px;
}

.processing-hint {
  font-size: 13px;
  color: var(--color-text-muted);
}

/* ---- 结果展示卡片 ---- */
.result-card {
  padding: 24px;
}

.result-preview {
  position: relative;
  text-align: center;
  margin-bottom: 4px;
}

.result-badge {
  position: absolute;
  top: 12px;
  right: 12px;
  background: rgba(0, 0, 0, 0.55);
  color: #fff;
  font-size: 11px;
  font-weight: 500;
  padding: 4px 10px;
  border-radius: 20px;
  z-index: 2;
  backdrop-filter: blur(4px);
  letter-spacing: 0.03em;
}

.result-preview img {
  width: 100%;
  max-height: 420px;
  object-fit: contain;
  border-radius: var(--radius-sm);
  background: repeating-conic-gradient(#f1f5f9 0% 25%, #ffffff 0% 50%) 50% / 20px 20px;
}

/* ---- 下载区 ---- */
.download-section {
  margin-top: 8px;
}

.divider {
  height: 1px;
  background-color: var(--color-border);
  margin: 20px 0;
}

.download-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 4px;
}

.download-hint {
  font-size: 13px;
  color: var(--color-text-muted);
  margin-bottom: 16px;
}

.code-input-group {
  display: flex;
  gap: 10px;
}

.code-input {
  flex: 1;
  padding: 10px 14px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-family: "SF Mono", "Fira Code", "Consolas", monospace;
  letter-spacing: 0.05em;
  color: var(--color-text);
  background-color: #f8fafc;
  transition: border-color var(--transition), box-shadow var(--transition);
  outline: none;
}

.code-input:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

.code-input::placeholder {
  color: var(--color-text-muted);
  letter-spacing: 0;
}

/* ---- 提示消息 ---- */
.message {
  margin-top: 14px;
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  font-size: 13px;
  font-weight: 500;
  line-height: 1.5;
}

.message.error {
  background-color: var(--color-error-bg);
  color: var(--color-error);
}

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

/* ---- 重新上传按钮 ---- */
.btn-restart {
  margin-top: 20px;
  width: 100%;
}

/* ---- 错误卡片 ---- */
.error-card {
  text-align: center;
  padding: 48px 32px;
}

.error-icon {
  color: var(--color-error);
  margin-bottom: 16px;
}

.error-text {
  font-size: 15px;
  color: var(--color-text-secondary);
  margin-bottom: 20px;
  line-height: 1.6;
}

/* ---- 底部 ---- */
.footer {
  margin-top: 40px;
  text-align: center;
}

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

.footer-links {
  margin-top: 4px;
}

.footer-links a {
  color: var(--color-primary);
  text-decoration: none;
}

.footer-links a:hover {
  text-decoration: underline;
}

.footer-sep {
  color: var(--color-border);
  margin: 0 8px;
}

/* ============================================================
   响应式设计（移动端适配）
   ============================================================ */

@media (max-width: 560px) {
  body {
    padding: 20px 12px 60px;
  }

  .card {
    padding: 20px 16px;
    border-radius: var(--radius-md);
  }

  .title {
    font-size: 22px;
  }

  .upload-area {
    padding: 32px 16px;
  }

  .code-input-group {
    flex-direction: column;
  }

  .btn-download {
    width: 100%;
  }

  .preview-actions {
    flex-direction: column;
  }

  .preview-actions .btn {
    width: 100%;
  }
}