/* ==========================================
   布局工具类
   ========================================== */

/* Flexbox 工具类 */
.flex {
    display: flex;
}

.flex-col {
    display: flex;
    flex-direction: column;
}

.flex-center {
    display: flex;
    justify-content: center;
    align-items: center;
}

.flex-between {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.flex-wrap {
    flex-wrap: wrap;
}

/* Grid 工具类 */
.grid {
    display: grid;
}

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

.grid-3 {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

/* 间距工具类 */
.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mt-4 { margin-top: 2rem; }

.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.mb-4 { margin-bottom: 2rem; }

.p-1 { padding: 0.5rem; }
.p-2 { padding: 1rem; }
.p-3 { padding: 1.5rem; }
.p-4 { padding: 2rem; }

/* 文本工具类 */
.text-center {
    text-align: center;
}

.text-left {
    text-align: left;
}

.text-right {
    text-align: right;
}

.text-lg {
    font-size: 1.125rem;
}

.text-xl {
    font-size: 1.25rem;
}

.text-2xl {
    font-size: 1.5rem;
}

.font-bold {
    font-weight: bold;
}

/* 显示工具类 */
.hidden {
    display: none;
}

.block {
    display: block;
}

.inline-block {
    display: inline-block;
}

/* 宽度工具类 */
.w-full {
    width: 100%;
}

.max-w-sm {
    max-width: 640px;
}

.max-w-md {
    max-width: 768px;
}

.max-w-lg {
    max-width: 1024px;
}

.max-w-xl {
    max-width: 1280px;
}

/* 颜色工具类 */
.text-primary {
    color: var(--primary-color);
}

.text-secondary {
    color: var(--secondary-color);
}

.bg-primary {
    background-color: var(--primary-color);
}

.bg-secondary {
    background-color: var(--secondary-color);
}

/* 圆角工具类 */
.rounded {
    border-radius: 8px;
}

.rounded-lg {
    border-radius: 12px;
}

.rounded-full {
    border-radius: 9999px;
}

/* 阴影工具类 */
.shadow {
    box-shadow: var(--shadow);
}

.shadow-hover:hover {
    box-shadow: var(--shadow-hover);
}

/* 动画工具类 */
.transition {
    transition: var(--transition);
}

.hover-lift {
    transition: transform 0.3s;
}

.hover-lift:hover {
    transform: translateY(-4px);
}