/* ================================
   m_default14 - 布局核心样式
   左侧导航 + 主内容区布局
   ================================ */

/* ================================
   顶部通栏
   ================================ */
.topbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--topbar-height);
    background: #f5f5f5;
    box-shadow: var(--shadow-sm);
    z-index: var(--z-fixed);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 var(--spacing-md);
    transition: all var(--transition-base) var(--transition-timing);
}

.topbar-left {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    flex: 1;
}

.topbar-right {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

/* Logo 样式 */
.topbar-logo {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--primary-color);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.topbar-logo:hover {
    color: var(--primary-dark);
}

.topbar-logo img {
    height: 40px;
    width: auto;
}

/* 汉堡菜单按钮 */
.hamburger-btn {
    display: none;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    width: 44px;
    height: 44px;
    background: none;
    border: none;
    cursor: pointer;
    border-radius: var(--radius-sm);
    transition: background-color var(--transition-fast);
}

.hamburger-btn:hover {
    background-color: var(--bg-color);
}

.hamburger-btn span {
    display: block;
    width: 24px;
    height: 2px;
    background-color: var(--text-primary);
    border-radius: var(--radius-full);
    transition: all var(--transition-base) var(--transition-timing);
}

.hamburger-btn span:nth-child(2) {
    margin: 5px 0;
}

/* 汉堡菜单动画状态 */
.hamburger-btn.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.hamburger-btn.active span:nth-child(2) {
    opacity: 0;
}

.hamburger-btn.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* ================================
   左侧导航容器
   ================================ */
.sidebar-wrapper {
    position: fixed;
    top: var(--topbar-height);
    left: 0;
    width: var(--sidebar-width);
    height: calc(100vh - var(--topbar-height));
    background-color: var(--sidebar-bg);
    z-index: var(--z-fixed);
    overflow-y: auto;
    overflow-x: hidden;
    transition: transform var(--transition-base) var(--transition-timing),
                width var(--transition-base) var(--transition-timing);
    box-shadow: var(--shadow-lg);
}

/* 左侧导航样式 */
.sidebar-nav {
    padding: var(--spacing-md) 0;
}

.sidebar-nav-list {
    list-style: none;
}

.sidebar-nav-list > .sidebar-nav-item {
    border-bottom: 1px solid var(--sidebar-border);
}

.sidebar-nav-link {
    display: flex;
    align-items: center;
    padding: var(--spacing-sm) var(--spacing-md);
    color: var(--sidebar-text);
    text-decoration: none;
    transition: background-color var(--transition-fast) var(--transition-timing);
    position: relative;
    font-size: var(--font-size-base);
    font-weight: 500;
}

.sidebar-nav-link:hover {
    background-color: var(--sidebar-hover);
    color: var(--sidebar-text);
}

.sidebar-nav-link.active {
    background-color: rgba(255,255,255,0.1);
    color: #ffffff;
    font-weight: 600;
}

.sidebar-nav-icon {
    width: 20px;
    height: 20px;
    margin-right: var(--spacing-sm);
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
}

.sidebar-nav-text {
    flex: 1;
}

.sidebar-nav-arrow {
    width: 16px;
    height: 16px;
    transition: transform var(--transition-base) var(--transition-timing);
    opacity: 0.7;
}

.sidebar-nav-item.open .sidebar-nav-arrow {
    transform: rotate(180deg);
}

/* 二级菜单 */
.sidebar-submenu {
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-base) var(--transition-timing);
    background-color: rgba(0,0,0,0.2);
}

.sidebar-submenu.open {
    max-height: 500px;
}

.sidebar-submenu-link {
    display: block;
    padding: var(--spacing-xs) var(--spacing-md);
    padding-left: calc(var(--spacing-md) * 2 + 20px);
    color: var(--sidebar-text-muted);
    text-decoration: none;
    font-size: var(--font-size-sm);
    transition: all var(--transition-fast) var(--transition-timing);
}

.sidebar-submenu-link:hover {
    color: var(--sidebar-text);
    background-color: rgba(255,255,255,0.05);
    padding-left: calc(var(--spacing-md) * 2 + 24px);
}

.sidebar-submenu-link.active {
    border-left: 3px solid var(--primary-color);
    color: #ffffff;
    font-weight: 600;
}

/* 侧边栏底部 */
.sidebar-footer {
    padding: var(--spacing-md);
    border-top: 1px solid var(--sidebar-border);
    margin-top: var(--spacing-lg);
}

.sidebar-footer-text {
    color: var(--sidebar-text-muted);
    font-size: var(--font-size-xs);
    text-align: center;
}

/* ================================
   移动端遮罩层
   ================================ */
.sidebar-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0,0,0,0.5);
    z-index: var(--z-modal-backdrop);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base) var(--transition-timing);
}

.sidebar-overlay.active {
    opacity: 1;
    visibility: visible;
}

/* ================================
   主内容区
   ================================ */
.main-wrapper {
    margin-left: var(--sidebar-width);
    margin-top: var(--topbar-height);
    min-height: calc(100vh - var(--topbar-height));
    width: calc(100% - var(--sidebar-width));
    background-color: var(--bg-color);
    transition: margin-left var(--transition-base) var(--transition-timing),
                width var(--transition-base) var(--transition-timing);
    padding-bottom: 50px;
}

/* ================================
   容器
   ================================ */
.container {
    width: 100%;
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

.container-fluid {
    width: 100%;
    padding: 0 var(--spacing-lg);
}

/* ================================
   网格系统
   ================================ */
.row {
    display: flex;
    flex-wrap: wrap;
    margin: 0 calc(-1 * var(--spacing-sm));
}

.col {
    flex: 1 0 0%;
    padding: 0 var(--spacing-sm);
}

.col-1 { flex: 0 0 8.333333%; max-width: 8.333333%; }
.col-2 { flex: 0 0 16.666667%; max-width: 16.666667%; }
.col-3 { flex: 0 0 25%; max-width: 25%; }
.col-4 { flex: 0 0 33.333333%; max-width: 33.333333%; }
.col-5 { flex: 0 0 41.666667%; max-width: 41.666667%; }
.col-6 { flex: 0 0 50%; max-width: 50%; }
.col-7 { flex: 0 0 58.333333%; max-width: 58.333333%; }
.col-8 { flex: 0 0 66.666667%; max-width: 66.666667%; }
.col-9 { flex: 0 0 75%; max-width: 75%; }
.col-10 { flex: 0 0 83.333333%; max-width: 83.333333%; }
.col-11 { flex: 0 0 91.666667%; max-width: 91.666667%; }
.col-12 { flex: 0 0 100%; max-width: 100%; }

/* ================================
   Flex 工具类
   ================================ */
.d-flex { display: flex; }
.d-inline-flex { display: inline-flex; }
.flex-row { flex-direction: row; }
.flex-column { flex-direction: column; }
.justify-start { justify-content: flex-start; }
.justify-center { justify-content: center; }
.justify-end { justify-content: flex-end; }
.justify-between { justify-content: space-between; }
.align-start { align-items: flex-start; }
.align-center { align-items: center; }
.align-end { align-items: flex-end; }
.flex-wrap { flex-wrap: wrap; }
.flex-nowrap { flex-wrap: nowrap; }
.flex-grow-0 { flex-grow: 0; }
.flex-grow-1 { flex-grow: 1; }
.flex-shrink-0 { flex-shrink: 0; }
.flex-shrink-1 { flex-shrink: 1; }

/* ================================
   间距工具类
   ================================ */
.m-0 { margin: 0; }
.m-1 { margin: var(--spacing-xs); }
.m-2 { margin: var(--spacing-sm); }
.m-3 { margin: var(--spacing-md); }
.m-4 { margin: var(--spacing-lg); }

.mt-0 { margin-top: 0; }
.mt-1 { margin-top: var(--spacing-xs); }
.mt-2 { margin-top: var(--spacing-sm); }
.mt-3 { margin-top: var(--spacing-md); }
.mt-4 { margin-top: var(--spacing-lg); }

.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: var(--spacing-xs); }
.mb-2 { margin-bottom: var(--spacing-sm); }
.mb-3 { margin-bottom: var(--spacing-md); }
.mb-4 { margin-bottom: var(--spacing-lg); }

.p-0 { padding: 0; }
.p-1 { padding: var(--spacing-xs); }
.p-2 { padding: var(--spacing-sm); }
.p-3 { padding: var(--spacing-md); }
.p-4 { padding: var(--spacing-lg); }

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

.text-primary { color: var(--primary-color); }
.text-secondary { color: var(--text-secondary); }
.text-muted { color: var(--text-muted); }
.text-white { color: var(--text-light); }

.font-weight-normal { font-weight: 400; }
.font-weight-medium { font-weight: 500; }
.font-weight-bold { font-weight: 700; }