@charset "UTF-8";

/* ===== 栅格系统 ===== */
.row {
  display: flex;
  flex-wrap: wrap;
  margin: 0 -15px;
}

.col {
  flex: 1;
  padding: 0 15px;
}

.col-1 { flex: 0 0 8.333%; max-width: 8.333%; padding: 0 15px; }
.col-2 { flex: 0 0 16.667%; max-width: 16.667%; padding: 0 15px; }
.col-3 { flex: 0 0 25%; max-width: 25%; padding: 0 15px; }
.col-4 { flex: 0 0 33.333%; max-width: 33.333%; padding: 0 15px; }
.col-5 { flex: 0 0 41.667%; max-width: 41.667%; padding: 0 15px; }
.col-6 { flex: 0 0 50%; max-width: 50%; padding: 0 15px; }
.col-7 { flex: 0 0 58.333%; max-width: 58.333%; padding: 0 15px; }
.col-8 { flex: 0 0 66.667%; max-width: 66.667%; padding: 0 15px; }
.col-9 { flex: 0 0 75%; max-width: 75%; padding: 0 15px; }
.col-10 { flex: 0 0 83.333%; max-width: 83.333%; padding: 0 15px; }
.col-11 { flex: 0 0 91.667%; max-width: 91.667%; padding: 0 15px; }
.col-12 { flex: 0 0 100%; max-width: 100%; padding: 0 15px; }

/* ===== 容器 ===== */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

.container-full {
  width: 100%;
  padding: 0 20px;
}

/* ===== 区块间距 ===== */
.section {
  padding: 60px 0;
}

.section-sm {
  padding: 40px 0;
}

.section-lg {
  padding: 80px 0;
}

/* ===== 卡片 ===== */
.card {
  background: #FFFFFF;
  border-radius: 8px;
  padding: 30px;
  box-shadow: 0 2px 12px rgba(0,0,0,0.08);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(0,0,0,0.12);
}

/* ===== 响应式断点 ===== */
@media (max-width: 1024px) {
  .col-md-1 { flex: 0 0 8.333%; max-width: 8.333%; padding: 0 15px; }
  .col-md-2 { flex: 0 0 16.667%; max-width: 16.667%; padding: 0 15px; }
  .col-md-3 { flex: 0 0 25%; max-width: 25%; padding: 0 15px; }
  .col-md-4 { flex: 0 0 33.333%; max-width: 33.333%; padding: 0 15px; }
  .col-md-6 { flex: 0 0 50%; max-width: 50%; padding: 0 15px; }
  .col-md-12 { flex: 0 0 100%; max-width: 100%; padding: 0 15px; }
}

@media (max-width: 768px) {
  .col-sm-1 { flex: 0 0 8.333%; max-width: 8.333%; padding: 0 15px; }
  .col-sm-2 { flex: 0 0 16.667%; max-width: 16.667%; padding: 0 15px; }
  .col-sm-3 { flex: 0 0 25%; max-width: 25%; padding: 0 15px; }
  .col-sm-4 { flex: 0 0 33.333%; max-width: 33.333%; padding: 0 15px; }
  .col-sm-6 { flex: 0 0 50%; max-width: 50%; padding: 0 15px; }
  .col-sm-12 { flex: 0 0 100%; max-width: 100%; padding: 0 15px; }
  
  .section { padding: 40px 0; }
  .section-lg { padding: 60px 0; }
  
  .container { padding: 0 15px; }
}

@media (max-width: 480px) {
  .col-xs-12 { flex: 0 0 100%; max-width: 100%; padding: 0 10px; }
  .col-xs-6 { flex: 0 0 50%; max-width: 50%; padding: 0 10px; }
  
  .container { padding: 0 10px; }
  .row { margin: 0 -10px; }
}

/* ===== Flex工具类 ===== */
.flex { display: flex; }
.inline-flex { display: inline-flex; }
.flex-row { flex-direction: row; }
.flex-column { flex-direction: column; }
.flex-wrap { flex-wrap: wrap; }
.flex-nowrap { flex-wrap: nowrap; }
.justify-start { justify-content: flex-start; }
.justify-end { justify-content: flex-end; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.justify-around { justify-content: space-around; }
.align-start { align-items: flex-start; }
.align-end { align-items: flex-end; }
.align-center { align-items: center; }
.align-stretch { align-items: stretch; }
.flex-1 { flex: 1; }

/* ===== 间距工具类 ===== */
.gap-10 { gap: 10px; }
.gap-20 { gap: 20px; }
.gap-30 { gap: 30px; }

/* ===== 浮动布局（IE兼容兜底） ===== */
.float-left { float: left; }
.float-right { float: right; }
.clearfix::after {
  content: "";
  display: table;
  clear: both;
}

/* ===== 可见性 ===== */
.hidden { display: none !important; }
.visible { display: block !important; }

@media (max-width: 768px) {
  .hidden-sm { display: none !important; }
  .visible-sm { display: block !important; }
}

@media (min-width: 769px) {
  .hidden-md-up { display: none !important; }
}