/* ===== 全局变量定义 ===== */
:root {
    /* 主题颜色 - 优化后的配色 */
    --primary-color: #818cf8;
    --primary-hover: #a5b4fc;
    --primary-glow: rgba(129, 140, 248, 0.3);
    --success-color: #34d399;
    --warning-color: #fbbf24;
    --danger-color: #f87171;
    
    /* 文本颜色 - 更柔和的对比 */
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-light: #64748b;
    
    /* 背景和效果 - 更柔和的渐变 */
    --bg-gradient: radial-gradient(ellipse at top, #1e293b 0%, #0f172a 50%, #020617 100%);
    --glass-bg: rgba(30, 41, 59, 0.75);
    --glass-bg-light: rgba(51, 65, 85, 0.5);
    --glass-border: rgba(148, 163, 184, 0.15);
    --glass-border-glow: rgba(129, 140, 248, 0.2);
    --glass-shadow: rgba(0, 0, 0, 0.4);
    --glass-inner-glow: inset 0 1px 0 rgba(255, 255, 255, 0.05);
    --node-hover: rgba(129, 140, 248, 0.12);
    --line-color: rgba(148, 163, 184, 0.2);
    --toggle-btn-color: #cbd5e1;
    --toggle-btn-bg: rgba(51, 65, 85, 0.6);
    
    /* 间距优化 */
    --spacing-xs: 0.375rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 0.75rem;
    --spacing-lg: 1rem;
    --spacing-xl: 1.5rem;
    
    /* 圆角优化 */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    
    /* 动画效果 */
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-fast: all 0.15s ease;
}

/* ===== 基础布局 ===== */
body {
    min-height: 100vh;
    background: var(--bg-gradient);
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    color: var(--text-primary);
    line-height: 1.6;
    text-size-adjust: 100%;
    -webkit-text-size-adjust: 100%;
    margin: 0;
    padding: 0;
}

/* 定制滚动条 */
::-webkit-scrollbar {
    width: 10px;
    height: 10px;
}

::-webkit-scrollbar-track {
    background: rgba(15, 23, 42, 0.3);
    border-radius: 5px;
}

::-webkit-scrollbar-thumb {
    background: rgba(148, 163, 184, 0.3);
    border-radius: 5px;
    transition: var(--transition);
}

::-webkit-scrollbar-thumb:hover {
    background: rgba(148, 163, 184, 0.5);
}

.container {
    max-width: 1200px;
    margin: 2rem auto;
    padding: 0 1.5rem;
}

/* ===== 玻璃拟态卡片 ===== */
.glass-card {
    background: var(--glass-bg);
    -webkit-backdrop-filter: blur(16px);
    backdrop-filter: blur(16px);
    border: 1px solid var(--glass-border);
    box-shadow: 
        0 8px 32px var(--glass-shadow),
        var(--glass-inner-glow);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    position: relative;
    overflow: hidden;
}

.glass-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, 
        transparent, 
        rgba(129, 140, 248, 0.3), 
        transparent
    );
    pointer-events: none;
}

/* ===== 顶部区域 ===== */
.header-content {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-md);
    border-bottom: 1px solid var(--glass-border);
}

.header-actions {
    display: flex;
    gap: var(--spacing-sm);
    justify-self: start;
}

.header-title {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--text-primary);
    margin: 0;
    letter-spacing: -0.02em;
    justify-self: center;
}

.header-spacer {
    justify-self: end;
}

/* ===== 按钮样式 ===== */
.header-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.5rem 1rem;
    border-radius: var(--radius-sm);
    border: 1px solid var(--glass-border);
    background: var(--glass-bg-light);
    color: var(--text-primary);
    font-weight: 500;
    font-size: 0.875rem;
    transition: var(--transition);
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.header-btn i {
    margin-right: 0.5rem;
    font-size: 0.875rem;
}

.header-btn:hover {
    background: rgba(51, 65, 85, 0.7);
    border-color: var(--glass-border-glow);
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(0, 0, 0, 0.3);
}

.header-btn:active {
    transform: translateY(0);
}

.header-btn.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-hover));
    color: white;
    border: none;
    box-shadow: 0 4px 12px var(--primary-glow);
}

.header-btn.btn-primary:hover {
    box-shadow: 0 6px 20px var(--primary-glow);
    transform: translateY(-2px);
}

/* ===== 树形结构 ===== */
.tree-container {
    padding: var(--spacing-md);
}

.tree-node {
    position: relative;
    margin: var(--spacing-sm) 0;
    border-radius: var(--radius-sm);
    transition: var(--transition);
    animation: fadeIn 0.3s ease-out;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.node-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.75rem 1rem;
    border-radius: var(--radius-sm);
    background: var(--glass-bg-light);
    border: 1px solid transparent;
    transition: var(--transition);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
}

.tree-node:hover > .node-content {
    background: var(--node-hover);
    border-color: var(--glass-border-glow);
    transform: translateX(6px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

/* 拖拽样式 */
.tree-node[draggable="true"] {
    cursor: grab;
}

.tree-node[draggable="true"]:active {
    cursor: grabbing;
}

.tree-node.drag-over > .node-content {
    background: rgba(129, 140, 248, 0.3) !important;
    border: 2px solid var(--primary-color) !important;
    box-shadow: 0 0 20px var(--primary-glow) !important;
    transition: all 0.2s ease;
}

.tree-node.drag-above > .node-content {
    border-top: 4px solid var(--primary-color) !important;
    box-shadow: 0 -6px 16px var(--primary-glow) !important;
    transition: all 0.2s ease;
}

.tree-node.drag-below > .node-content {
    border-bottom: 4px solid var(--primary-color) !important;
    box-shadow: 0 6px 16px var(--primary-glow) !important;
    transition: all 0.2s ease;
}

/* ===== 节点内容 ===== */
.node-left {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.node-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    border-radius: 6px;
    background: rgba(129, 140, 248, 0.15);
    color: var(--primary-color);
    transition: var(--transition);
}

.node-icon.folder {
    background: rgba(251, 191, 36, 0.15);
    color: var(--warning-color);
    cursor: pointer;
    position: relative;
}

.node-icon.folder:hover {
    background: rgba(251, 191, 36, 0.25);
    transform: scale(1.1);
}

.node-icon.folder::after {
    content: '';
    position: absolute;
    inset: -4px;
    border-radius: 8px;
    background: transparent;
    transition: var(--transition);
}

.node-icon.folder:hover::after {
    background: rgba(251, 191, 36, 0.1);
}

.node-name {
    font-weight: 600;
    color: var(--text-primary);
    font-size: 0.9375rem;
}

/* 链接节点 - 移除图标 */
.node-link {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
    font-size: 0.9375rem;
    transition: var(--transition);
    position: relative;
    display: flex;
    align-items: center;
}

.node-link::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--primary-color), var(--primary-hover));
    transition: width 0.3s ease;
    border-radius: 1px;
}

.node-link:hover::after {
    width: 100%;
}

.node-link:hover {
    color: var(--primary-hover);
}

/* ===== 操作按钮组 ===== */
.node-actions {
    display: flex;
    gap: 0.35rem;
    opacity: 0;
    transition: var(--transition);
}

.tree-node:hover .node-actions {
    opacity: 1;
}

.btn-action {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 4px 8px;
    border-radius: 4px;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    transition: var(--transition);
    cursor: pointer;
    font-size: 12px;
    white-space: nowrap;
}

.btn-action i {
    font-size: 12px;
}

.btn-action span {
    display: none;
}

.tree-node:hover .btn-action span {
    display: inline;
}

.btn-action:hover {
    background: rgba(129, 140, 248, 0.15);
    color: var(--primary-color);
    transform: translateY(-1px);
}

.btn-action.btn-add:hover {
    background: rgba(52, 211, 153, 0.15);
    color: var(--success-color);
}

.btn-action.btn-edit:hover {
    background: rgba(251, 191, 36, 0.15);
    color: var(--warning-color);
}

.btn-action.btn-delete:hover {
    background: rgba(248, 113, 113, 0.15);
    color: var(--danger-color);
}

.btn-action.btn-move-up:hover,
.btn-action.btn-move-down:hover {
    background: rgba(129, 140, 248, 0.15);
    color: var(--primary-color);
}

.btn-action.btn-move-left:hover,
.btn-action.btn-move-right:hover {
    background: rgba(251, 191, 36, 0.15);
    color: var(--warning-color);
}

.btn-action[disabled] {
    opacity: 0.3;
    cursor: not-allowed;
    pointer-events: none;
}

/* 确保按钮在禁用状态下仍然显示 */
.btn-action[disabled]:hover {
    background: transparent;
    transform: none;
}

/* 移动端适配 */
@media (max-width: 768px) {
    .container {
        margin: 0.5rem;
        padding: 0;
    }
    
    .glass-card {
        border-radius: 12px;
        padding: 0.75rem;
    }
    
    .header-content {
        flex-direction: column;
        gap: 0.75rem;
        margin-bottom: 0.5rem;
        padding-bottom: 0.5rem;
    }
    
    .header-actions {
        width: 100%;
        display: grid;
        grid-template-columns: repeat(3, 1fr);
        gap: 0.5rem;
    }
    
    .header-btn {
        width: 100%;
        padding: 0.5rem;
        font-size: 0.875rem;
    }
    
    .tree-children {
        margin-left: 1rem;
        padding-left: 0.5rem;
    }
    
    .node-content {
        padding: 0.5rem;
    }

    .btn-action {
        width: 24px;
        height: 24px;
        padding: 0;
        font-size: 12px;
    }

    .btn-action span {
        display: none;
    }

    .btn-action i {
        font-size: 12px;
    }
}

/* ===== 移动端手势支持 ===== */
@media (hover: none) {
    .tree-node:hover > .node-content {
        transform: none;
    }
    
    .btn-action:hover,
    .header-btn:hover {
        transform: none;
    }
    
    .btn-action:active,
    .header-btn:active {
        transform: scale(0.95);
    }
    
    .btn-action,
    .header-btn,
    .toggle-btn {
        touch-action: manipulation;
        -webkit-tap-highlight-color: transparent;
    }
}

/* ===== 横屏模式优化 ===== */
@media (max-width: 768px) and (orientation: landscape) {
    .header-content {
        flex-direction: row;
    }
    
    .header-actions {
        width: auto;
        display: flex;
    }
}

/* ===== 浅色模式支持（可选） ===== */
@media (prefers-color-scheme: light) {
    :root {
        --bg-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
        --glass-bg: rgba(255, 255, 255, 0.92);
        --glass-border: rgba(255, 255, 255, 0.6);
        --glass-shadow: rgba(0, 0, 0, 0.12);
        --text-primary: #111827;
        --text-secondary: #4b5563;
        --text-light: #6b7280;
        --node-hover: rgba(79, 70, 229, 0.06);
        --line-color: #c9d1d9;
        --toggle-btn-color: #374151;
        --toggle-btn-bg: #f9fafb;
        --primary-color: #4f46e5;
        --primary-hover: #4338ca;
    }
    
    .node-content {
        background: rgba(255, 255, 255, 0.7);
        border: 1px solid transparent;
        box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
    }
    
    .header-btn {
        background: rgba(255, 255, 255, 0.8);
        border: 1px solid rgba(255, 255, 255, 0.5);
    }
    
    .header-btn:hover {
        background: white;
        box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
    }
}

/* ===== 打印样式 ===== */
@media print {
    .tree-node {
        break-inside: avoid;
        page-break-inside: avoid;
    }
    
    .node-actions {
        display: none;
    }
}

/* ===== 模态框样式优化 ===== */
.modal-content {
    background: var(--glass-bg);
    -webkit-backdrop-filter: blur(16px);
    backdrop-filter: blur(16px);
    border: 1px solid var(--glass-border);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
    border-radius: var(--radius-lg);
}

.modal-header {
    border-bottom: 1px solid var(--glass-border);
    background: var(--glass-bg-light);
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}

.modal-title {
    color: var(--text-primary);
    font-weight: 600;
}

.modal-body {
    color: var(--text-primary);
}

.modal-footer {
    border-top: 1px solid var(--glass-border);
    background: var(--glass-bg-light);
    border-radius: 0 0 var(--radius-lg) var(--radius-lg);
}

.form-label {
    color: var(--text-secondary);
    font-weight: 500;
}

.form-control {
    background: rgba(30, 41, 59, 0.8);
    border: 1px solid var(--glass-border);
    color: #ffffff;
    border-radius: var(--radius-sm);
    transition: var(--transition);
    padding: 0.625rem 0.875rem;
}

.form-control:focus {
    background: rgba(30, 41, 59, 0.95);
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px var(--primary-glow);
    color: #ffffff;
}

.form-control::placeholder {
    color: var(--text-secondary);
    opacity: 0.7;
}

.form-select {
    background: rgba(30, 41, 59, 0.8);
    border: 1px solid var(--glass-border);
    color: #ffffff;
    border-radius: var(--radius-sm);
    padding: 0.625rem 2.5rem 0.625rem 0.875rem;
    transition: var(--transition);
    /* 添加自定义下拉箭头 */
    appearance: none;
    -webkit-appearance: none;
    -moz-appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12' fill='none'%3E%3Cpath d='M2.5 4.5L6 8L9.5 4.5' stroke='%23ffffff' stroke-width='1.5' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 0.875rem center;
    background-size: 12px;
    cursor: pointer;
}

.form-select:focus {
    background: rgba(30, 41, 59, 0.95);
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px var(--primary-glow);
    color: #ffffff;
}

/* 下拉框选项样式 */
.form-select option {
    background: #1e293b;
    color: #ffffff;
    padding: 0.5rem;
}

.form-select optgroup {
    background: #0f172a;
    color: #94a3b8;
}

.btn-close {
    filter: invert(1) grayscale(100%) brightness(200%);
    opacity: 0.7;
    transition: var(--transition);
}

.btn-close:hover {
    opacity: 1;
    transform: rotate(90deg);
}

/* ===== 树形结构层级 ===== */
.tree-children {
    position: relative;
    margin-left: 2.5rem;
    padding-left: 1rem;
}

.tree-children::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(180deg, 
        var(--line-color) 0%, 
        rgba(148, 163, 184, 0.1) 100%
    );
    border-radius: 1px;
}

/* ===== 折叠展开按钮 ===== */
.toggle-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 22px;
    height: 22px;
    padding: 0;
    border: 1px solid var(--glass-border);
    background: var(--toggle-btn-bg);
    color: var(--toggle-btn-color);
    cursor: pointer;
    transition: var(--transition);
    border-radius: 5px;
    margin-right: 0.5rem;
}

.toggle-btn:hover {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
    box-shadow: 0 2px 8px var(--primary-glow);
    transform: scale(1.1);
}

.toggle-btn:active {
    transform: scale(0.95);
}

.toggle-btn i {
    font-size: 11px;
    transition: var(--transition);
    font-weight: bold;
}

.tree-node.collapsed > .tree-children {
    display: none;
}

/* 文件夹图标折叠状态 */
.tree-node.collapsed .node-icon.folder i {
    transform: scale(0.9);
    opacity: 0.8;
}

/* ===== 按钮组显示逻辑 ===== */
.node-actions {
    display: flex;
    gap: 2px;
    opacity: 0;
    transition: var(--transition);
}

.tree-node:hover .node-actions {
    opacity: 1;
}

@media (max-width: 768px) {
    .tree-children {
        margin-left: 1.25rem;
        padding-left: 0.5rem;
    }

    .tree-children::before {
        width: 1px;
    }

    .node-actions {
        opacity: 1;
        display: flex;
        gap: 2px;
    }

    .btn-action {
        width: 24px;
        height: 24px;
        padding: 0;
        font-size: 12px;
        display: flex;
        align-items: center;
        justify-content: center;
    }

    .btn-action span {
        display: none;
    }

    .btn-action i {
        font-size: 12px;
    }

    .toggle-btn {
        width: 16px;
        height: 16px;
        margin-right: 0.25rem;
    }
}