/* 咔咔签 - iOS应用签名工具-在线IPA文件签名与安装 */

/* CSS Variables */
:root {
  /* Color Palette */
  --primary: #3b82f6;
  --primary-hover: #2563eb;
  --primary-light: #60a5fa;
  --primary-dark: #1d4ed8;
  
  --background: #f8fafc;
  --surface: #ffffff;
  --surface-light: #f1f5f9;
  --surface-hover: #e2e8f0;
  --surface-dark: #f8fafc;
  
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #64748b;
  --text-light: #94a3b8;
  
  --border: #e2e8f0;
  --border-light: #cbd5e1;
  --border-dark: #94a3b8;
  
  --success: #10b981;
  --success-light: #34d399;
  --warning: #f59e0b;
  --warning-light: #fbbf24;
  --error: #ef4444;
  --error-light: #f87171;
  
  /* Typography */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-weight-light: 300;
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  
  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  
  /* Border Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  
  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 250ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* Reset and Base Styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 16px;
  line-height: 1.5;
}

body {
  font-family: var(--font-family);
  font-weight: var(--font-weight-normal);
  color: var(--text-primary);
  background: 
    radial-gradient(circle at 20% 80%, rgba(59, 130, 246, 0.08) 0%, transparent 50%),
    radial-gradient(circle at 80% 20%, rgba(16, 185, 129, 0.08) 0%, transparent 50%),
    linear-gradient(135deg, #f8fafc 0%, #e2e8f0 100%);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
  will-change: auto;
}

/* Modern Container */
.modern-container {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  max-width: 1000px;
  margin: 0 auto;
  padding: var(--space-lg);
  padding-top: 6rem;
}

/* Header */
.app-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: linear-gradient(135deg, rgba(248, 250, 252, 0.9) 0%, rgba(226, 232, 240, 0.8) 100%);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(203, 213, 225, 0.3);
  padding: var(--space-md) 0;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
}

.header-content {
  max-width: 1000px;
  margin: 0;
  padding: 0 var(--space-lg) 0 120px;
  display: flex;
  align-items: center;
  justify-content: flex-start;
}

.app-title {
  font-size: 1.5rem;
  font-weight: var(--font-weight-bold);
  color: var(--text-primary);
  margin: 0;
  letter-spacing: -0.025em;
  text-decoration: none;
  transition: color var(--transition-normal);
}

.app-title:hover {
  color: var(--primary);
}

/* Main Content */
.app-main {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
}

/* Steps Navigation */
.steps-navigation {
  width: 100%;
  max-width: 800px;
  margin-bottom: var(--space-xl);
  padding: var(--space-lg);
  background: var(--surface);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border);
}

.steps-container {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
}

.step-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-xs);
  transition: all var(--transition-normal);
}

.step-circle {
  width: 2.5rem;
  height: 2.5rem;
  border-radius: 50%;
  background: var(--surface-light);
  color: var(--text-muted);
  border: 2px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: var(--font-weight-semibold);
  font-size: 0.875rem;
  transition: all var(--transition-normal);
}

.step-label {
  font-size: 0.75rem;
  color: var(--text-muted);
  font-weight: var(--font-weight-medium);
  text-align: center;
  transition: color var(--transition-normal);
}

.step-connector {
  width: 2rem;
  height: 2px;
  background: var(--border);
  transition: background var(--transition-normal);
}

/* Step States */
.step-item.active .step-circle {
  background: var(--primary);
  color: white;
  border-color: var(--primary);
}

.step-item.active .step-label {
  color: var(--primary);
  font-weight: var(--font-weight-semibold);
}

.step-item.completed .step-circle {
  background: var(--success);
  color: white;
  border-color: var(--success);
}

.step-item.completed .step-label {
  color: var(--success);
  font-weight: var(--font-weight-semibold);
}

.step-item.completed + .step-connector {
  background: var(--success);
}

.step-item.active + .step-connector {
  background: linear-gradient(90deg, var(--primary) 0%, var(--border) 100%);
}

/* Step Sections */
.step-section {
  width: 100%;
  max-width: 700px;
  margin: 0 auto;
}

/* File Selection Grid */
.file-selection-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-md);
  margin-bottom: var(--space-lg);
}

.file-zone {
  position: relative;
  border: 2px dashed var(--border);
  border-radius: var(--radius-md);
  padding: var(--space-lg);
  background: var(--surface);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-normal);
  cursor: pointer;
  overflow: hidden;
}

.file-zone:hover {
  border-color: var(--primary);
  background: var(--surface-light);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.file-zone.is-valid {
  border-color: var(--success);
  background: rgba(16, 185, 129, 0.1);
}

.file-zone.is-invalid {
  border-color: var(--error);
  background: rgba(239, 68, 68, 0.1);
}

.file-content {
  text-align: center;
  pointer-events: none;
}

.file-icon {
  width: 2rem;
  height: 2rem;
  margin: 0 auto var(--space-sm);
  color: var(--text-muted);
  transition: color var(--transition-normal);
}

.file-zone:hover .file-icon {
  color: var(--primary);
}

.file-title {
  font-size: 0.875rem;
  font-weight: var(--font-weight-semibold);
  color: var(--text-primary);
  margin-bottom: var(--space-xs);
}

.file-hint {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.file-input {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  cursor: pointer;
}

/* Form Section */
.form-section {
  background: var(--surface);
  border-radius: var(--radius-md);
  padding: var(--space-lg);
  margin-bottom: var(--space-lg);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
}

.form-group {
  margin-bottom: var(--space-md);
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-md);
}

.form-label {
  display: block;
  font-size: 0.875rem;
  font-weight: var(--font-weight-medium);
  color: var(--text-secondary);
  margin-bottom: var(--space-sm);
}

.optional {
  color: var(--text-muted);
  font-weight: var(--font-weight-normal);
  font-size: 0.75rem;
}

.form-input {
  width: 100%;
  padding: var(--space-md);
  background: var(--background);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: 1rem;
  transition: all var(--transition-normal);
  -webkit-appearance: none;
  -moz-appearance: none;
  appearance: none;
}

.form-input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
  background: var(--surface);
}

.form-input::placeholder {
  color: var(--text-muted);
  opacity: 1;
}

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

.form-input.is-valid {
  border-color: var(--success);
  box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.1);
}

.form-input.is-invalid {
  border-color: var(--error);
  box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.1);
}

/* Action Section */
.action-section {
  text-align: center;
  margin-top: var(--space-lg);
}

.sign-button {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  background: var(--primary);
  color: white;
  border: none;
  border-radius: var(--radius-md);
  padding: var(--space-md) var(--space-xl);
  font-size: 1rem;
  font-weight: var(--font-weight-semibold);
  cursor: pointer;
  transition: all var(--transition-normal);
  box-shadow: var(--shadow-md);
  position: relative;
  overflow: hidden;
}

.sign-button:hover {
  background: var(--primary-hover);
  transform: translateY(-2px);
  box-shadow: var(--shadow-xl);
}

.sign-button:active {
  transform: translateY(0);
  box-shadow: var(--shadow-md);
}

.sign-button:focus {
  outline: none;
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.3);
}

.sign-button:active {
  transform: translateY(0);
}

.button-icon {
  transition: transform var(--transition-normal);
}

.sign-button:hover .button-icon {
  transform: scale(1.1);
}

.sign-button.loading {
  pointer-events: none;
  opacity: 0.8;
}

.sign-button.disabled {
  background: var(--border);
  color: var(--text-muted);
  cursor: not-allowed;
  opacity: 0.6;
}

.sign-button.disabled:hover {
  background: var(--border);
  transform: none;
  box-shadow: none;
}

/* Apple Watch 风格进度条 - 与网站主题色搭配 */
.progress-container {
  background: linear-gradient(135deg, 
    #ffffff 0%, 
    #f8fafc 100%);
  border-radius: 32px;
  padding: 60px 40px;
  border: 2px solid #e2e8f0;
  box-shadow: 
    0 20px 40px rgba(59, 130, 246, 0.1),
    0 8px 16px rgba(59, 130, 246, 0.05),
    inset 0 1px 0 rgba(255, 255, 255, 0.8);
  position: relative;
  overflow: hidden;
}

.progress-container::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: radial-gradient(circle at 50% 50%, 
    rgba(59, 130, 246, 0.05) 0%, 
    transparent 70%);
  pointer-events: none;
}

/* Apple Watch 圆形进度条 */
.apple-watch-progress {
  display: flex;
  justify-content: center;
  align-items: center;
  margin-bottom: 20px;
}

.progress-circle {
  position: relative;
  width: 200px;
  height: 200px;
}

.progress-svg {
  width: 100%;
  height: 100%;
  transform: rotate(-90deg);
  filter: drop-shadow(0 4px 8px rgba(0, 122, 255, 0.3));
}

.progress-bg {
  stroke: #e2e8f0;
  opacity: 0.6;
}

.progress-fill {
  transition: stroke-dashoffset 0.8s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  filter: drop-shadow(0 0 8px rgba(59, 130, 246, 0.4));
  animation: pulse-glow 2s ease-in-out infinite;
}

@keyframes pulse-glow {
  0%, 100% {
    filter: drop-shadow(0 0 8px rgba(59, 130, 246, 0.4));
  }
  50% {
    filter: drop-shadow(0 0 16px rgba(59, 130, 246, 0.6));
  }
}

.progress-center {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  text-align: center;
  color: #0f172a;
}

.circular-progress {
  position: relative;
  display: inline-block;
}

.progress-ring {
  transform: rotate(-90deg);
  transition: all 0.6s ease-out;
}

.progress-ring-circle {
  transition: stroke 0.3s ease;
}

.progress-ring-fill {
  transition: stroke-dashoffset 0.6s ease-out;
  stroke-linecap: round;
  filter: drop-shadow(0 2px 4px rgba(59, 130, 246, 0.3));
}

.progress-percentage {
  font-size: 2.5rem;
  font-weight: 300;
  color: #0f172a;
  letter-spacing: -2px;
  margin-bottom: 8px;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
  font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Display', sans-serif;
}

.progress-label {
  font-size: 0.875rem;
  color: #64748b;
  font-weight: 400;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  opacity: 0.8;
  font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Text', sans-serif;
}

@keyframes shimmer {
  0% {
    transform: translateX(-100%);
  }
  100% {
    transform: translateX(100%);
  }
}


/* Processing Section */
.processing-container {
  text-align: center;
  background: var(--surface);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-md);
  position: relative;
  overflow: hidden;
}

.processing-container::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--primary), var(--primary-light));
  opacity: 0.1;
}

.processing-icon {
  margin-bottom: var(--space-lg);
}

.spinner {
  width: 48px;
  height: 48px;
  border: 4px solid var(--border);
  border-top: 4px solid var(--primary);
  border-radius: 50%;
  animation: spin 1s linear infinite;
  margin: 0 auto;
}

.processing-title {
  font-size: 1.5rem;
  font-weight: var(--font-weight-semibold);
  color: var(--text-primary);
  margin-bottom: var(--space-sm);
}

.processing-text {
  font-size: 1rem;
  color: var(--text-secondary);
  margin-bottom: var(--space-lg);
}

.processing-steps {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  max-width: 300px;
  margin: 0 auto;
}

.processing-step {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-md);
  border-radius: var(--radius-md);
  background: var(--surface-light);
  transition: all var(--transition-normal);
  opacity: 0.6;
}

.processing-step.active {
  background: var(--primary);
  color: white;
  opacity: 1;
  transform: scale(1.02);
}

.processing-step.completed {
  background: var(--success);
  color: white;
  opacity: 1;
}


.step-icon {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  font-weight: var(--font-weight-semibold);
  position: relative;
  flex-shrink: 0;
}

.processing-step.active .step-icon {
  background: rgba(255, 255, 255, 0.2);
}

.processing-step.completed .step-icon {
  background: rgba(255, 255, 255, 0.2);
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

.processing-text {
  font-size: 1.125rem;
  color: var(--text-secondary);
}

/* Install Section */
.install-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-lg);
  margin-bottom: var(--space-lg);
}

.qr-section, .download-section {
  background: var(--surface);
  border-radius: var(--radius-md);
  padding: var(--space-lg);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
}

.qr-title, .download-title {
  font-size: 1rem;
  font-weight: var(--font-weight-semibold);
  color: var(--text-primary);
  margin-bottom: var(--space-md);
  text-align: center;
}

.qr-code-container {
  display: flex;
  justify-content: center;
  align-items: center;
  width: 100%;
  min-height: 200px;
  padding: var(--space-lg);
}

.qr-code {
  width: 150px;
  height: 150px;
  border-radius: var(--radius-sm);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  display: flex;
  justify-content: center;
  align-items: center;
}

.qr-code canvas,
.qr-code img {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
}

.download-link-container {
  display: flex;
  gap: var(--space-sm);
}

.download-input {
  flex: 1;
  padding: var(--space-md);
  background: var(--background);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: 0.875rem;
}

.copy-button {
  padding: var(--space-md);
  background: var(--surface-light);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-normal);
}

.copy-button:hover {
  background: var(--surface-hover);
  color: var(--text-primary);
}

.restart-button {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  background: var(--surface);
  color: var(--text-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: var(--space-md) var(--space-lg);
  font-size: 1rem;
  font-weight: var(--font-weight-medium);
  cursor: pointer;
  transition: all var(--transition-normal);
}

.restart-button:hover {
  background: var(--surface-light);
  color: var(--text-primary);
  border-color: var(--border-light);
}

/* MacBook Screen Optimization */
@media (min-width: 1024px) and (max-height: 800px) {
  .modern-container {
    padding: var(--space-md);
    padding-top: 5rem;
  }
  
  .step-header {
    margin-bottom: var(--space-md);
  }
  
  .file-selection-grid {
    margin-bottom: var(--space-md);
  }
  
  .form-section {
    margin-bottom: var(--space-md);
  }
  
  .action-section {
    margin-top: var(--space-md);
  }
}

/* Responsive Design */
@media (max-width: 1024px) {
  .modern-container {
    padding: var(--space-md);
    padding-top: 5rem;
  }
  
  .header-content {
    padding: 0 var(--space-md) 0 80px;
  }
  
  .app-title {
    font-size: 1.25rem;
  }
  
  .file-selection-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .progress-container {
    padding: var(--space-lg);
  }
  
  .progress-text {
    font-size: 1.125rem;
  }
}

@media (max-width: 768px) {
  .modern-container {
    padding: var(--space-lg);
    padding-top: 5rem;
  }
  
  .header-content {
    padding: 0 var(--space-md) 0 80px;
  }
  
  .app-title {
    font-size: 1.25rem;
  }
  
  .steps-navigation {
    padding: var(--space-md);
    margin-bottom: var(--space-lg);
  }
  
  .progress-container {
    padding: var(--space-md);
  }
  
  .progress-text {
    font-size: 1rem;
  }
  
  .progress-subtitle {
    font-size: 0.8rem;
  }
  
  .steps-container {
    gap: var(--space-xs);
  }
  
  .step-circle {
    width: 2rem;
    height: 2rem;
    font-size: 0.75rem;
  }
  
  .step-label {
    font-size: 0.625rem;
  }
  
  .step-connector {
    width: 1rem;
  }
  
  .file-selection-grid {
    grid-template-columns: 1fr;
  }
  
  .form-row {
    grid-template-columns: 1fr;
  }
  
  .install-container {
    grid-template-columns: 1fr;
  }
  
  /* Apple Watch 进度条响应式 */
  .progress-circle {
    width: 160px;
    height: 160px;
  }
  
  .progress-percentage {
    font-size: 2rem;
  }
  
  .progress-label {
    font-size: 0.75rem;
  }
  
}

@media (max-width: 480px) {
  .modern-container {
    padding: var(--space-md);
    padding-top: 4.5rem;
  }
  
  .header-content {
    padding: 0 var(--space-sm) 0 60px;
  }
  
  .app-title {
    font-size: 1.125rem;
  }
  
  .step-title {
    font-size: 1.5rem;
  }
  
  .file-zone {
    padding: var(--space-lg);
  }
  
  .form-section {
    padding: var(--space-lg);
  }
}

/* Animation Classes */
.fade-enter-active, .fade-leave-active {
  transition: opacity var(--transition-normal);
}

.fade-enter, .fade-leave-to {
  opacity: 0;
}

/* Loading States */
.loading:not(.sign-button) {
  position: relative;
  pointer-events: none;
}

.loading::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 20px;
  height: 20px;
  margin: -10px 0 0 -10px;
  border: 2px solid var(--border);
  border-top: 2px solid var(--primary);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

/* Error States */
.error-message {
  color: var(--error);
  font-size: 0.875rem;
  margin-top: var(--space-xs);
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

.error-message::before {
  content: '⚠';
  font-size: 0.75rem;
}

/* Success States */
.success-message {
  color: var(--success);
  font-size: 0.875rem;
  margin-top: var(--space-xs);
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

.success-message::before {
  content: '✓';
  font-size: 0.75rem;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-track {
  background: var(--surface);
}

::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: var(--radius-sm);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--border-light);
}

/* Accessibility Improvements */
@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

@media (prefers-color-scheme: dark) {
  :root {
    --background: #0f172a;
    --surface: #1e293b;
    --text-primary: #f8fafc;
    --text-secondary: #cbd5e1;
  }
}

/* Focus indicators for keyboard navigation */
*:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}

/* High contrast mode support */
@media (prefers-contrast: high) {
  :root {
    --border: #000000;
    --text-primary: #000000;
    --text-secondary: #333333;
  }
}



/* 右上角“iOS证书检测”链接 */
.ios-link {
  position: absolute;
  top: 50%;
  right: 120px;
  transform: translateY(-50%);
  font-size: 1.5rem; /* 与 .app-title 相同 */
  font-weight: var(--font-weight-bold);
  color: var(--text-primary);
  text-decoration: none;
  transition: color var(--transition-normal);
}

.ios-link:hover {
  color: var(--primary);
  text-decoration: underline;
}


/* 📱 移动端优化：加大左右边距 */
@media (max-width: 768px) {
  .header-content {
    padding-left: 2.5rem;  /* 原来大约1.5rem，扩大至40px */
    padding-right: 2.5rem;
  }
  .ios-link {
    right: 2.5rem;         /* 与 header-content 对齐 */
    font-size: 1.3rem;     /* 保持协调 */
  }
}