:root {
  --color-text-primary: #111111;
  --color-text-secondary: #787774;
  --color-text-disabled: #AAAAAA;
  --color-bg: #FFFFFF;
  --color-bg-soft: #F7F6F3;
  --color-border: #EAEAEA;
  --color-accent: #111111;
  --color-accent-hover: #333333;
  --color-success: #346538;
  --color-error: #9F2F2D;

  --font-family: 'SF Pro Display', 'Geist Sans', 'Helvetica Neue', 'Switzer', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'Geist Mono', 'SF Mono', 'JetBrains Mono', 'Fira Code', 'DengXian', 'Microsoft YaHei', monospace;

  --font-size-xs: 12px;
  --font-size-sm: 13px;
  --font-size-base: 16px;
  --font-size-lg: 20px;
  --font-size-xl: 24px;

  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 32px;
  --space-5: 48px;

  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;

  --shadow-focus: 0 0 0 2px rgba(0,0,0,0.08);
}

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

body {
  font-family: var(--font-mono);
  font-size: var(--font-size-base);
  line-height: 1.6;
  color: var(--color-text-primary);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
}

.global-header {
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--space-3);
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 100;
}

.global-header .logo {
  font-size: var(--font-size-lg);
  font-weight: 600;
  color: var(--color-text-primary);
  text-decoration: none;
}

.global-footer {
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  font-size: var(--font-size-xs);
  color: var(--color-text-disabled);
  border-top: 1px solid var(--color-border);
  padding: var(--space-1) var(--space-3);
  background: var(--color-bg);
}

.tool-status {
  font-size: var(--font-size-xs);
  color: var(--color-text-secondary);
  min-height: 18px;
}

.tool-workspace {
  max-width: 880px;
  margin: 0 auto;
  padding: var(--space-5) var(--space-3);
  min-height: calc(100vh - 104px);
}

.tool-workspace h1 {
  font-size: var(--font-size-xl);
  font-weight: 600;
  margin-bottom: var(--space-1);
}

.tool-desc {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-4);
}

.card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-3);
  margin-bottom: var(--space-3);
}

.input {
  width: 100%;
  height: 48px;
  padding: 0 var(--space-2);
  font-size: var(--font-size-base);
  border: 1px solid #DDDDDD;
  border-radius: var(--radius-md);
  outline: none;
  transition: border-color 0.15s, box-shadow 0.15s;
}

.input:focus {
  border-color: var(--color-text-primary);
  box-shadow: var(--shadow-focus);
}

.textarea {
  min-height: 160px;
  padding: var(--space-2);
  resize: vertical;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 48px;
  padding: 0 var(--space-3);
  font-size: 14px;
  font-weight: 500;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  transition: background-color 0.15s, transform 0.1s;
  text-decoration: none;
  min-width: 80px;
}

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

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

.btn-primary:active {
  transform: scale(0.98);
}

.btn-secondary {
  background: transparent;
  border-color: #DDDDDD;
  color: var(--color-text-primary);
}

.btn-secondary:hover {
  background: #F5F5F5;
}

.btn:disabled {
  opacity: 0.4;
  pointer-events: none;
}

.输出-box,
.output-box {
  background: var(--color-bg-soft);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-2);
  font-family: var(--font-mono);
  font-size: 14px;
  line-height: 1.5;
  min-height: 100px;
  white-space: pre-wrap;
  word-break: break-all;
  position: relative;
}

.copy-btn {
  position: absolute;
  top: 8px;
  right: 8px;
  background: transparent;
  border: none;
  color: var(--color-text-secondary);
  cursor: pointer;
  font-size: var(--font-size-sm);
  padding: 4px 8px;
  border-radius: var(--radius-sm);
}

.copy-btn:hover {
  color: var(--color-text-primary);
  background: rgba(0,0,0,0.03);
}

.back-btn {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  text-decoration: none;
  padding: 4px 12px;
  border: 1px solid var(--color-border);
  border-radius: 9999px;
  transition: all 0.15s;
  font-family: var(--font-mono);
}
.back-btn:hover {
  border-color: var(--color-text-primary);
  color: var(--color-text-primary);
}
.global-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.file-upload {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  border: 1px dashed var(--color-border);
  border-radius: var(--radius-md);
  cursor: pointer;
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  transition: border-color 0.15s, background 0.15s;
  background: transparent;
}
.file-upload:hover {
  border-color: var(--color-text-primary);
  background: var(--color-bg-soft);
  color: var(--color-text-primary);
}