/* 基础样式 - 淡黄色调青春活泼配色 */
:root {
    --primary-color: #FFE066;
    --primary-light: #FFF3B0;
    --primary-dark: #FFD700;
    --secondary-color: #FF9A8B;
    --accent-color: #88D8B0;
    --accent-blue: #7EC8E3;
    --accent-purple: #C8A2C8;
    --bg-color: #FFFEF5;
    --card-bg: #FFFFFF;
    --text-color: #333333;
    --text-light: #666666;
    --border-color: #F0E6C8;
    --shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
    --shadow-hover: 0 4px 16px rgba(0, 0, 0, 0.12);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
}

/* 头部导航 */
.header {
    background-color: var(--primary-light);
    padding: 15px 30px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.header h1 {
    color: var(--text-color);
    font-size: 24px;
    font-weight: 600;
}

.header-actions {
    display: flex;
    gap: 15px;
    align-items: center;
}

.user-info {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px 15px;
    background-color: var(--card-bg);
    border-radius: 20px;
    box-shadow: var(--shadow);
}

.user-info span {
    color: var(--text-color);
    font-weight: 500;
}

/* 按钮样式 */
.btn {
    padding: 10px 20px;
    border: none;
    border-radius: 20px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    transition: all 0.2s ease;
}

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

.btn-primary:hover {
    background-color: var(--primary-dark);
    box-shadow: var(--shadow-hover);
}

.btn-secondary {
    background-color: var(--accent-color);
    color: white;
}

.btn-secondary:hover {
    opacity: 0.9;
    box-shadow: var(--shadow-hover);
}

.btn-danger {
    background-color: var(--secondary-color);
    color: white;
}

.btn-danger:hover {
    opacity: 0.9;
}

.btn-outline {
    background-color: transparent;
    border: 2px solid var(--primary-color);
    color: var(--text-color);
}

.btn-outline:hover {
    background-color: var(--primary-light);
}

.btn-small {
    padding: 6px 12px;
    font-size: 12px;
}

/* 主内容区 */
.main-container {
    display: flex;
    min-height: calc(100vh - 70px);
}

/* 侧边栏 */
.sidebar {
    width: 280px;
    background-color: var(--card-bg);
    border-right: 1px solid var(--border-color);
    padding: 20px;
    overflow-y: auto;
}

.sidebar h3 {
    color: var(--text-color);
    margin-bottom: 15px;
    padding-bottom: 10px;
    border-bottom: 2px solid var(--primary-color);
}

.student-list {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.student-item {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--primary-light);
    border-radius: 50%;
    cursor: pointer;
    font-weight: 500;
    font-size: 14px;
    transition: all 0.2s ease;
    border: 2px solid transparent;
}

.student-item:hover {
    background-color: var(--primary-color);
    transform: scale(1.1);
}

.student-item.active {
    background-color: var(--primary-color);
    border-color: var(--text-color);
}

.student-item.has-password {
    border: 2px solid var(--accent-color);
}

/* 关系网图区域 */
.network-container {
    flex: 1;
    padding: 20px;
    display: flex;
    flex-direction: column;
    height: calc(100vh - 70px);
    overflow: hidden;
}

.network-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
    flex-shrink: 0;
}

.network-title {
    font-size: 20px;
    color: var(--text-color);
}

.network-canvas {
    flex: 1;
    background-color: var(--card-bg);
    border-radius: 15px;
    box-shadow: var(--shadow);
    position: relative;
    overflow: hidden;
}

#network-graph {
    width: 100%;
    height: 100%;
    position: absolute;
    top: 0;
    left: 0;
}

.network-tip {
    text-align: center;
    color: var(--text-light);
    font-size: 13px;
    margin-top: 10px;
    flex-shrink: 0;
}

/* 模态框 */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.4);
    z-index: 2000;
    justify-content: center;
    align-items: center;
}

.modal.active {
    display: flex;
}

.modal-content {
    background-color: var(--card-bg);
    padding: 30px;
    border-radius: 20px;
    box-shadow: var(--shadow-hover);
    max-width: 450px;
    width: 90%;
    max-height: 80vh;
    overflow-y: auto;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    padding-bottom: 15px;
    border-bottom: 2px solid var(--primary-color);
}

.modal-header h2 {
    color: var(--text-color);
    font-size: 20px;
}

.modal-close {
    background: none;
    border: none;
    font-size: 24px;
    cursor: pointer;
    color: var(--text-light);
}

.modal-close:hover {
    color: var(--text-color);
}

/* 表单样式 */
.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    color: var(--text-color);
    font-weight: 500;
}

.form-group input,
.form-group select {
    width: 100%;
    padding: 12px 15px;
    border: 2px solid var(--border-color);
    border-radius: 10px;
    font-size: 14px;
    transition: border-color 0.2s ease;
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary-color);
}

/* 列表样式 */
.list-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px;
    background-color: var(--primary-light);
    border-radius: 10px;
    margin-bottom: 10px;
}

.list-item-info {
    display: flex;
    align-items: center;
    gap: 10px;
}

.list-item-actions {
    display: flex;
    gap: 8px;
}

/* 标签 */
.tag {
    display: inline-block;
    padding: 4px 10px;
    border-radius: 15px;
    font-size: 12px;
    font-weight: 500;
}

.tag-friend { background-color: var(--accent-color); color: white; }
.tag-deskmate { background-color: var(--accent-blue); color: white; }
.tag-couple { background-color: var(--secondary-color); color: white; }
.tag-default { background-color: var(--primary-color); color: var(--text-color); }

/* 提示信息 */
.toast {
    position: fixed;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    padding: 15px 30px;
    background-color: var(--text-color);
    color: white;
    border-radius: 10px;
    box-shadow: var(--shadow-hover);
    z-index: 3000;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.toast.show {
    opacity: 1;
}

.toast.success {
    background-color: var(--accent-color);
}

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

/* 管理员面板 */
.admin-panel {
    display: none;
    padding: 20px;
    background-color: var(--card-bg);
    border-left: 1px solid var(--border-color);
    width: 350px;
    overflow-y: auto;
}

.admin-panel.active {
    display: block;
}

.admin-section {
    margin-bottom: 30px;
}

.admin-section h3 {
    color: var(--text-color);
    margin-bottom: 15px;
    padding-bottom: 10px;
    border-bottom: 2px solid var(--accent-color);
}

/* 表格样式 */
.table {
    width: 100%;
    border-collapse: collapse;
}

.table th,
.table td {
    padding: 12px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.table th {
    background-color: var(--primary-light);
    font-weight: 600;
}

.table tr:hover {
    background-color: var(--bg-color);
}

/* 标签页 */
.tabs {
    display: flex;
    gap: 5px;
    margin-bottom: 20px;
    background-color: var(--primary-light);
    padding: 5px;
    border-radius: 10px;
}

.tab-btn {
    flex: 1;
    padding: 10px;
    border: none;
    background: transparent;
    cursor: pointer;
    border-radius: 8px;
    font-weight: 500;
    transition: all 0.2s ease;
}

.tab-btn.active {
    background-color: var(--card-bg);
    box-shadow: var(--shadow);
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

/* 徽章 */
.badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 20px;
    height: 20px;
    padding: 0 6px;
    background-color: var(--secondary-color);
    color: white;
    border-radius: 10px;
    font-size: 12px;
    font-weight: 600;
    margin-left: 5px;
}

/* 空状态 */
.empty-state {
    text-align: center;
    padding: 40px;
    color: var(--text-light);
}

.empty-state-icon {
    font-size: 48px;
    margin-bottom: 15px;
}

/* 响应式 */
@media (max-width: 768px) {
    .main-container {
        flex-direction: column;
    }

    .sidebar {
        width: 100%;
        border-right: none;
        border-bottom: 1px solid var(--border-color);
    }

    .admin-panel {
        width: 100%;
        border-left: none;
        border-top: 1px solid var(--border-color);
    }

    .header {
        flex-direction: column;
        gap: 10px;
    }
}

/* 加载动画 */
.loading {
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 40px;
}

.loading-spinner {
    width: 40px;
    height: 40px;
    border: 4px solid var(--primary-light);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* 工具提示 */
.tooltip {
    position: relative;
}

.tooltip::after {
    content: attr(data-tooltip);
    position: absolute;
    bottom: 100%;
    left: 50%;
    transform: translateX(-50%);
    padding: 8px 12px;
    background-color: var(--text-color);
    color: white;
    border-radius: 6px;
    font-size: 12px;
    white-space: nowrap;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.2s ease;
}

.tooltip:hover::after {
    opacity: 1;
}

/* 关系线颜色 */
.relation-line-friend { stroke: #88D8B0; }
.relation-line-deskmate { stroke: #7EC8E3; }
.relation-line-couple { stroke: #FF9A8B; }
.relation-line-default { stroke: #FFE066; }