/* layout.css - 栅格+容器+响应式断点（全局加载） */

/* ===== 栅格系统 ===== */
.row { display: flex; flex-wrap: wrap; margin: 0 -10px; }
.col { padding: 0 10px; flex: 1; }
.col-1 { width: 8.3333%; flex: 0 0 8.3333%; }
.col-2 { width: 16.6666%; flex: 0 0 16.6666%; }
.col-3 { width: 25%; flex: 0 0 25%; }
.col-4 { width: 33.3333%; flex: 0 0 33.3333%; }
.col-5 { width: 41.6666%; flex: 0 0 41.6666%; }
.col-6 { width: 50%; flex: 0 0 50%; }
.col-7 { width: 58.3333%; flex: 0 0 58.3333%; }
.col-8 { width: 66.6666%; flex: 0 0 66.6666%; }
.col-9 { width: 75%; flex: 0 0 75%; }
.col-10 { width: 83.3333%; flex: 0 0 83.3333%; }
.col-11 { width: 91.6666%; flex: 0 0 91.6666%; }
.col-12 { width: 100%; flex: 0 0 100%; }

/* ===== 响应式断点 ===== */
@media (max-width: 1200px) {
  .container { max-width: 960px; }
  .col-lg-4 { width: 33.3333%; flex: 0 0 33.3333%; }
  .col-lg-6 { width: 50%; flex: 0 0 50%; }
  .col-lg-12 { width: 100%; flex: 0 0 100%; }
}
@media (max-width: 992px) {
  .container { max-width: 720px; }
  .col-md-4 { width: 33.3333%; flex: 0 0 33.3333%; }
  .col-md-6 { width: 50%; flex: 0 0 50%; }
  .col-md-12 { width: 100%; flex: 0 0 100%; }
}
@media (max-width: 768px) {
  .container { padding: 0 15px; }
  .row { margin: 0 -5px; }
  .col { padding: 0 5px; }
  .col-sm-6 { width: 50%; flex: 0 0 50%; }
  .col-sm-12 { width: 100%; flex: 0 0 100%; }
}
@media (max-width: 480px) {
  .col-xs-12 { width: 100%; flex: 0 0 100%; }
}

/* ===== 页面通用布局 ===== */
.page-section {
  padding: 60px 0;
}
.page-section:nth-child(even) {
  background: var(--white);
}
.page-section:nth-child(odd) {
  background: var(--light);
}
.section-title {
  text-align: center;
  margin-bottom: 40px;
}
.section-title h2 {
  color: var(--primary);
  font-size: 1.8em;
  margin-bottom: 10px;
  position: relative;
  display: inline-block;
}
.section-title h2::after {
  content: "";
  display: block;
  width: 60px;
  height: 3px;
  background: var(--secondary);
  margin: 10px auto 0;
  border-radius: 2px;
}
.section-title p {
  color: var(--text-muted);
  max-width: 600px;
  margin: 0 auto;
}

/* ===== 两栏布局（主内容+侧边栏） ===== */
.main-layout {
  display: flex;
  gap: 30px;
  max-width: var(--container);
  margin: 0 auto;
  padding: 30px 20px;
}
.main-content { flex: 1; min-width: 0; }
.sidebar { width: 300px; flex-shrink: 0; }

@media (max-width: 768px) {
  .main-layout { flex-direction: column; }
  .sidebar { width: 100%; }
  .page-section { padding: 40px 0; }
}

/* ===== 卡片网格 ===== */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}
@media (max-width: 768px) {
  .card-grid { grid-template-columns: 1fr; }
}

/* ===== Logo墙 ===== */
.logo-wall {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 30px;
}
.logo-wall-item {
  width: 120px;
  height: 60px;
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  font-size: 0.85em;
  transition: all 0.3s;
}
.logo-wall-item:hover {
  border-color: var(--secondary);
  color: var(--secondary);
  transform: translateY(-2px);
}