/* ========================================
   页面通用样式
   ======================================== */

@import url('variables.css');

/* ============ 页面主体 ============ */
.page-body {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: var(--spacing-3xl);
  padding: var(--spacing-3xl) var(--spacing-lg);
  max-width: var(--container-max-width);
  margin: 0 auto;
  align-items: start;
}

.page-main {
  flex: 1;
}

/* ============ 内容区 ============ */
.content-section {
  position: relative;
  background: linear-gradient(145deg, rgba(18, 20, 26, 0.95), rgba(33, 35, 43, 0.9));
  padding: var(--spacing-2xl);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-dark-md);
  margin-bottom: var(--spacing-2xl);
  border: var(--border-width-thin) solid rgba(255, 255, 255, 0.06);
  overflow: hidden;
}

.content-section::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(120deg, rgba(255, 255, 255, 0.05), transparent 60%);
  opacity: 0.5;
  pointer-events: none;
}

.content-section > * {
  position: relative;
  z-index: 1;
}

.content-section h2 {
  color: var(--color-primary-light);
  margin-bottom: var(--spacing-lg);
  padding-bottom: var(--spacing-lg);
  border-bottom: var(--border-width-thin) solid rgba(255, 255, 255, 0.08);
}

.content-section h3 {
  color: var(--color-white);
  margin-top: var(--spacing-2xl);
  margin-bottom: var(--spacing-lg);
}

.content-section p {
  color: rgba(255, 255, 255, 0.75);
  line-height: var(--line-height-relaxed);
  margin-bottom: var(--spacing-lg);
}

.content-section ul,
.content-section ol {
  margin-left: var(--spacing-2xl);
  margin-bottom: var(--spacing-lg);
}

.content-section li {
  margin-bottom: var(--spacing-md);
  color: rgba(255, 255, 255, 0.7);
}

/* ============ 侧边栏 ============ */
.page-sidebar {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-2xl);
}

.sidebar-widget {
  background: linear-gradient(145deg, rgba(18, 20, 26, 0.95), rgba(33, 35, 43, 0.85));
  padding: var(--spacing-2xl);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-dark-md);
  border: var(--border-width-thin) solid rgba(255, 255, 255, 0.06);
}

.sidebar-widget h3 {
  color: var(--color-primary-light);
  margin-bottom: var(--spacing-lg);
  font-size: var(--font-size-lg);
  padding-bottom: var(--spacing-lg);
  border-bottom: var(--border-width-thin) solid rgba(255, 255, 255, 0.08);
}

.sidebar-widget ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.sidebar-widget li {
  margin-bottom: var(--spacing-md);
}

.sidebar-widget a {
  color: rgba(255, 255, 255, 0.65);
  text-decoration: none;
  transition: all var(--transition-fast);
  display: block;
  padding: var(--spacing-md) 0;
  border-left: 3px solid transparent;
  padding-left: var(--spacing-lg);
}

.sidebar-widget a:hover {
  color: var(--color-white);
  border-left-color: var(--color-primary-light);
  padding-left: calc(var(--spacing-lg) + var(--spacing-md));
}

/* ============ 卡片网格 ============ */
.card-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-2xl);
  margin-bottom: var(--spacing-2xl);
}

.card {
  background: linear-gradient(150deg, rgba(20, 22, 28, 0.95), rgba(33, 35, 43, 0.9));
  border-radius: var(--border-radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-dark-md);
  border: var(--border-width-thin) solid rgba(255, 255, 255, 0.06);
  transition: all var(--transition-base);
  display: flex;
  flex-direction: column;
}

.card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-dark-lg);
}

.card-image {
  width: 100%;
  height: 200px;
  overflow: hidden;
  background-color: rgba(255, 255, 255, 0.04);
}

.card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-base);
}

.card:hover .card-image img {
  transform: scale(1.05);
}

.card-content {
  padding: var(--spacing-lg);
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.card-title {
  color: var(--color-white);
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--spacing-md);
}

.card-description {
  color: rgba(255, 255, 255, 0.7);
  font-size: var(--font-size-sm);
  margin-bottom: var(--spacing-lg);
  flex-grow: 1;
}

.card-footer {
  display: flex;
  gap: var(--spacing-md);
  margin-top: auto;
}

.card-footer .btn {
  flex: 1;
  padding: var(--spacing-md) var(--spacing-lg);
  font-size: var(--font-size-sm);
}

/* ============ 表格样式 ============ */
.table-responsive {
  overflow-x: auto;
  margin-bottom: var(--spacing-2xl);
}

.table-responsive table {
  width: 100%;
  border-collapse: collapse;
}

.table-responsive th {
  background: linear-gradient(120deg, var(--color-primary), var(--color-primary-dark));
  color: var(--color-white);
  padding: var(--spacing-lg);
  text-align: left;
  font-weight: var(--font-weight-bold);
}

.table-responsive td {
  padding: var(--spacing-lg);
  border-bottom: var(--border-width-thin) solid rgba(255, 255, 255, 0.08);
  color: rgba(255, 255, 255, 0.7);
}

.table-responsive tr:hover {
  background-color: rgba(255, 255, 255, 0.05);
}

/* ============ 时间轴 ============ */
.timeline {
  position: relative;
  padding: var(--spacing-2xl) 0;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  width: 3px;
  height: 100%;
  background: linear-gradient(180deg, rgba(255, 31, 31, 0.8), rgba(255, 31, 31, 0));
}

.timeline-item {
  margin-bottom: var(--spacing-3xl);
  position: relative;
}

.timeline-item:nth-child(odd) .timeline-content {
  margin-left: 0;
  margin-right: 50%;
  padding-right: var(--spacing-2xl);
}

.timeline-item:nth-child(even) .timeline-content {
  margin-left: 50%;
  margin-right: 0;
  padding-left: var(--spacing-2xl);
}

.timeline-marker {
  position: absolute;
  left: 50%;
  top: 0;
  transform: translateX(-50%);
  width: 20px;
  height: 20px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
  border: 3px solid rgba(255, 255, 255, 0.6);
  border-radius: 50%;
  z-index: 1;
}

.timeline-content {
  background: linear-gradient(145deg, rgba(18, 20, 26, 0.95), rgba(33, 35, 43, 0.85));
  padding: var(--spacing-lg);
  border-radius: var(--border-radius-md);
  box-shadow: var(--shadow-dark-md);
  border: var(--border-width-thin) solid rgba(255, 255, 255, 0.06);
}

.timeline-content h3 {
  color: var(--color-white);
  margin-bottom: var(--spacing-md);
}

.timeline-content p {
  color: rgba(255, 255, 255, 0.7);
  margin-bottom: 0;
}

/* ============ 步骤条 ============ */
.steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-2xl);
}

.step {
  position: relative;
  text-align: center;
}

.step::after {
  content: '';
  position: absolute;
  top: 30px;
  left: 50%;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, rgba(255, 255, 255, 0) 0%, rgba(255, 255, 255, 0.25) 50%, rgba(255, 255, 255, 0) 100%);
  z-index: -1;
}

.step:last-child::after {
  display: none;
}

.step-number {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 60px;
  height: 60px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
  color: var(--color-white);
  border-radius: 50%;
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  margin: 0 auto var(--spacing-lg);
  box-shadow: var(--shadow-dark-md);
}

.step-title {
  color: var(--color-white);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--spacing-md);
}

.step-description {
  color: rgba(255, 255, 255, 0.65);
  font-size: var(--font-size-sm);
}

/* ============ 特性列表 ============ */
.features-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.features-list li {
  padding: var(--spacing-lg) 0;
  padding-left: var(--spacing-3xl);
  position: relative;
  color: rgba(255, 255, 255, 0.7);
  line-height: var(--line-height-relaxed);
}

.features-list li::before {
  content: '✓';
  position: absolute;
  left: 0;
  top: var(--spacing-lg);
  color: var(--color-primary-light);
  font-weight: var(--font-weight-bold);
  font-size: var(--font-size-lg);
}

/* ============ 选型器与结果卡片 ============ */
.selector-grid {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
  gap: var(--spacing-4xl);
}

.selector-form,
.selector-result {
  background: linear-gradient(150deg, rgba(18, 20, 26, 0.95), rgba(33, 35, 43, 0.85));
  border-radius: var(--border-radius-2xl);
  border: 1px solid rgba(255, 255, 255, 0.08);
  padding: var(--spacing-3xl);
  box-shadow: var(--shadow-dark-md);
}

.selector-form {
  display: grid;
  gap: var(--spacing-2xl);
}

.selector-form label {
  display: block;
  margin-bottom: var(--spacing-sm);
  color: rgba(255, 255, 255, 0.75);
  font-weight: var(--font-weight-medium);
}

.result-highlight {
  display: grid;
  gap: var(--spacing-sm);
  padding: var(--spacing-2xl);
  border-radius: var(--border-radius-xl);
  background: linear-gradient(120deg, rgba(255, 31, 31, 0.22), rgba(255, 255, 255, 0.05));
  border: 1px solid rgba(255, 255, 255, 0.1);
  margin-bottom: var(--spacing-2xl);
}

.result-highlight .label {
  font-size: var(--font-size-xs);
  letter-spacing: 1px;
  color: rgba(255, 255, 255, 0.7);
  text-transform: uppercase;
}

.result-highlight strong {
  font-size: var(--font-size-xl);
  color: var(--color-white);
}

.result-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-lg);
  margin-top: var(--spacing-2xl);
}

/* ============ 响应式 ============ */
@media (max-width: 1200px) {
  .page-body {
    grid-template-columns: 1fr;
  }

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

  .selector-grid {
    grid-template-columns: 1fr;
  }

  .timeline::before {
    left: 0;
  }

  .timeline-item:nth-child(odd) .timeline-content,
  .timeline-item:nth-child(even) .timeline-content {
    margin-left: 50px;
    margin-right: 0;
    padding-left: var(--spacing-2xl);
  }

  .timeline-marker {
    left: 0;
  }

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

@media (max-width: 768px) {
  .page-body {
    padding: var(--spacing-2xl) var(--spacing-lg);
  }

  .card-grid {
    grid-template-columns: 1fr;
  }

  .steps {
    grid-template-columns: 1fr;
  }

  .step::after {
    display: none;
  }

  .timeline-item:nth-child(odd) .timeline-content,
  .timeline-item:nth-child(even) .timeline-content {
    margin-left: 50px;
    margin-right: 0;
    padding-left: var(--spacing-2xl);
  }

  .table-responsive {
    font-size: var(--font-size-sm);
  }

  .table-responsive th,
  .table-responsive td {
    padding: var(--spacing-md);
  }
}

@media (max-width: 576px) {
  .page-body {
    padding: var(--spacing-lg);
  }

  .content-section {
    padding: var(--spacing-lg);
  }

  .card-grid {
    gap: var(--spacing-lg);
  }

  .card-image {
    height: 150px;
  }

  .features-list li {
    padding-left: var(--spacing-2xl);
  }

  .features-list li::before {
    top: var(--spacing-sm);
  }
}