/* Apple Design 风格 CSS */

:root {
  /* 颜色变量 */
  --apple-blue: #0071e3;
  --apple-blue-hover: #0077ed;
  --apple-gray: #f5f5f7;
  --apple-dark-gray: #86868b;
  --apple-black: #1d1d1f;
  --apple-white: #ffffff;
  --apple-error: #ff3b30;
  --apple-success: #34c759;
  --apple-warning: #ff9500;
  
  /* 字体变量 */
  --apple-font: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'SF Pro Text', 'Helvetica Neue', Arial, sans-serif;
  
  /* 圆角变量 */
  --apple-radius-sm: 8px;
  --apple-radius-md: 12px;
  --apple-radius-lg: 16px;
  
  /* 阴影变量 */
  --apple-shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.05);
  --apple-shadow-md: 0 4px 8px rgba(0, 0, 0, 0.08);
  --apple-shadow-lg: 0 8px 16px rgba(0, 0, 0, 0.12);
}

/* 全局样式 */
body {
  background-color: #bba1cb;
  font-family: var(--apple-font);
  color: var(--apple-black);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.container {
  max-width: 1200px;
  padding: 0 20px;
}

/* 排版 */
h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  letter-spacing: -0.015em;
}

h1 {
  font-size: 2.5rem;
}

h2 {
  font-size: 2rem;
}

h3 {
  font-size: 1.75rem;
}

p {
  font-size: 1rem;
  line-height: 1.6;
}

/* 导航栏样式 */
.navbar {
  background-color: rgba(255, 255, 255, 0.8) !important;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  box-shadow: var(--apple-shadow-sm);
  padding: 12px 0;
  border: none;
}

.navbar-brand {
  font-weight: 600;
  color: var(--apple-black) !important;
  font-size: 1.25rem;
}

.navbar-dark .navbar-nav .nav-link {
  color: var(--apple-black) !important;
  font-weight: 500;
  padding: 8px 16px;
  transition: opacity 0.2s ease;
}

.navbar-dark .navbar-nav .nav-link:hover {
  opacity: 0.7;
}

.navbar-toggler {
  border: none;
  padding: 0.5rem;
}

.navbar-toggler-icon {
  background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' width='30' height='30' viewBox='0 0 30 30'%3e%3cpath stroke='rgba(29, 29, 31, 1)' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e") !important;
}

/* 卡片样式 */
.card {
  border: none;
  border-radius: var(--apple-radius-md);
  box-shadow: var(--apple-shadow-sm);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  background-color: var(--apple-white);
  overflow: hidden;
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--apple-shadow-md);
}

.card-header {
  background-color: var(--apple-white);
  border-bottom: 1px solid rgba(0, 0, 0, 0.05);
  padding: 16px 20px;
  font-weight: 600;
}

.card-body {
  padding: 20px;
}

.card-title {
  font-weight: 600;
  margin-bottom: 12px;
  color: var(--apple-black);
}

.card-text {
  color: var(--apple-dark-gray);
}

/* 按钮样式 */
.btn {
  border-radius: var(--apple-radius-sm);
  padding: 10px 20px;
  font-weight: 500;
  transition: all 0.2s ease;
  border: none;
}

.btn-primary {
  background-color: var(--apple-blue);
  color: white;
}

.btn-primary:hover, .btn-primary:focus {
  background-color: var(--apple-blue-hover);
  box-shadow: 0 0 0 3px rgba(0, 113, 227, 0.3);
}

.btn-outline-primary {
  border: 1px solid var(--apple-blue);
  color: var(--apple-blue);
}

.btn-outline-primary:hover {
  background-color: var(--apple-blue);
  color: white;
}

.btn-secondary {
  background-color: rgba(0, 0, 0, 0.05);
  color: var(--apple-black);
}

.btn-secondary:hover {
  background-color: rgba(0, 0, 0, 0.1);
}

/* 表单样式 */
.form-control {
  border-radius: var(--apple-radius-sm);
  border: 1px solid rgba(0, 0, 0, 0.1);
  padding: 12px 16px;
  font-size: 1rem;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.form-control:focus {
  border-color: var(--apple-blue);
  box-shadow: 0 0 0 3px rgba(0, 113, 227, 0.2);
}

.form-label {
  font-weight: 500;
  margin-bottom: 8px;
  color: var(--apple-black);
}

.form-check-input {
  width: 18px;
  height: 18px;
  margin-top: 0.2rem;
}

.form-check-input:checked {
  background-color: var(--apple-blue);
  border-color: var(--apple-blue);
}

.form-check-label {
  padding-left: 6px;
}

/* 警告框样式 */
.alert {
  border: none;
  border-radius: var(--apple-radius-md);
  padding: 16px 20px;
  margin-bottom: 20px;
}

.alert-success {
  background-color: rgba(52, 199, 89, 0.1);
  color: var(--apple-success);
}

.alert-danger {
  background-color: rgba(255, 59, 48, 0.1);
  color: var(--apple-error);
}

.alert-warning {
  background-color: rgba(255, 149, 0, 0.1);
  color: var(--apple-warning);
}

.alert-info {
  background-color: rgba(0, 113, 227, 0.1);
  color: var(--apple-blue);
}

/* 列表组样式 */
.list-group-item {
  border: none;
  border-bottom: 1px solid rgba(0, 0, 0, 0.05);
  padding: 16px 20px;
}

.list-group-item:last-child {
  border-bottom: none;
}

/* 徽章样式 */
.badge {
  font-weight: 500;
  padding: 6px 10px;
  border-radius: var(--apple-radius-sm);
}

/* 页脚样式 */
footer {
  background-color: var(--apple-white);
  padding: 20px 0;
  margin-top: 60px;
}

footer p {
  color: var(--apple-dark-gray);
  font-size: 0.9rem;
}

/* 考试卡片特定样式 */
.exam-card {
  border-radius: var(--apple-radius-lg);
  padding: 20px;
}

.exam-card .card-title {
  font-size: 1.25rem;
  margin-bottom: 10px;
}

.exam-card .badge {
  margin-right: 5px;
}

/* 考试计时器样式 */
#timer {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--apple-blue);
  background-color: rgba(0, 113, 227, 0.1);
  padding: 8px 16px;
  border-radius: var(--apple-radius-sm);
  display: inline-block;
}

/* 题目卡片样式 */
.question-card {
  margin-bottom: 24px;
  border-radius: var(--apple-radius-lg);
}

.question-card .card-header {
  padding: 16px 20px;
  font-weight: 600;
}

/* 结果页面样式 */
.result-summary {
  background-color: var(--apple-white);
  border-radius: var(--apple-radius-lg);
  padding: 24px;
  margin-bottom: 30px;
  box-shadow: var(--apple-shadow-sm);
}

.correct-answer {
  color: var(--apple-success);
  font-weight: 600;
}

.wrong-answer {
  color: var(--apple-error);
  font-weight: 600;
}

/* 响应式调整 */
@media (max-width: 768px) {
  .container {
    padding: 0 16px;
  }
  
  h1 {
    font-size: 2rem;
  }
  
  .card-title {
    font-size: 1.1rem;
  }
  
  .btn {
    padding: 8px 16px;
  }
}