/* 全局样式 */
:root {
    --primary-color: #2563eb;
    --secondary-color: #7c3aed;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --danger-color: #ef4444;
    --dark-bg: #1e293b;
    --darker-bg: #0f172a;
    --light-bg: #f1f5f9;
    --border-color: #e2e8f0;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-muted: #94a3b8;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Helvetica', 'Arial', sans-serif;
    background-color: var(--light-bg);
    color: var(--text-primary);
    display: flex;
    height: 100vh;
    overflow: hidden;
}

/* 侧边栏 */
.sidebar {
    width: 260px;
    background: linear-gradient(135deg, var(--darker-bg) 0%, var(--dark-bg) 100%);
    color: white;
    display: flex;
    flex-direction: column;
    padding: 20px 0;
    box-shadow: 2px 0 10px rgba(0, 0, 0, 0.1);
}

.logo {
    padding: 0 20px 30px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.logo h2 {
    font-size: 24px;
    margin-bottom: 5px;
}

.logo p {
    font-size: 12px;
    color: var(--text-muted);
}

.nav-menu {
    list-style: none;
    flex: 1;
    padding: 20px 0;
    overflow-y: auto;
}

.nav-item {
    padding: 12px 20px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 12px;
    transition: all 0.3s;
    border-left: 3px solid transparent;
}

.nav-item:hover {
    background-color: rgba(255, 255, 255, 0.05);
}

.nav-item.active {
    background-color: rgba(37, 99, 235, 0.1);
    border-left-color: var(--primary-color);
}

.nav-item .icon {
    font-size: 20px;
}

.nav-link {
    color: inherit;
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 12px;
    width: 100%;
}

.nav-divider {
    margin: 15px 20px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.system-status {
    padding: 20px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.status-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 10px;
    font-size: 12px;
}

.status-indicator {
    font-size: 12px;
}

.status-indicator.online {
    color: var(--success-color);
}

.status-indicator.offline {
    color: var(--danger-color);
}

/* 主内容区 */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.top-bar {
    background: white;
    padding: 20px 30px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border-color);
}

.top-bar h1 {
    font-size: 24px;
    font-weight: 600;
}

.user-info {
    display: flex;
    align-items: center;
    gap: 15px;
}

.content-section {
    display: none;
    padding: 30px;
    overflow-y: auto;
    flex: 1;
}

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

/* 卡片 */
.card {
    background: white;
    border-radius: 12px;
    padding: 24px;
    margin-bottom: 20px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.card h3 {
    font-size: 18px;
    margin-bottom: 20px;
    color: var(--text-primary);
}

.dashboard-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
}

.full-width {
    grid-column: 1 / -1;
}

/* 统计 */
.stat-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 15px;
}

.stat-item {
    text-align: center;
    padding: 15px;
    background: var(--light-bg);
    border-radius: 8px;
}

.stat-label {
    display: block;
    font-size: 12px;
    color: var(--text-secondary);
    margin-bottom: 5px;
}

.stat-value {
    display: block;
    font-size: 24px;
    font-weight: 600;
    color: var(--primary-color);
}

/* 按钮 */
.btn-primary,
.btn-secondary,
.btn-action,
.btn-send,
.btn-icon {
    padding: 10px 20px;
    border: none;
    border-radius: 8px;
    font-size: 14px;
    cursor: pointer;
    transition: all 0.3s;
}

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

.btn-primary:hover {
    background: #1d4ed8;
    transform: translateY(-1px);
}

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

.btn-secondary:hover {
    background: var(--border-color);
}

.btn-action {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    padding: 20px;
    background: var(--light-bg);
    color: var(--text-primary);
    width: 100%;
    margin-bottom: 10px;
}

.btn-action:hover {
    background: var(--border-color);
    transform: translateY(-2px);
}

.btn-action .btn-icon {
    font-size: 32px;
}

.quick-actions {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
}

.btn-send {
    background: var(--primary-color);
    color: white;
    padding: 12px 24px;
}

.btn-icon {
    background: transparent;
    font-size: 18px;
    padding: 5px;
}

/* 表单 */
.form-group {
    margin-bottom: 15px;
}

.form-group label {
    display: block;
    margin-bottom: 5px;
    font-size: 14px;
    color: var(--text-secondary);
}

.form-input,
.form-select,
.form-textarea {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 14px;
    transition: border-color 0.3s;
}

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

.form-textarea {
    resize: vertical;
    font-family: inherit;
}

/* 聊天 */
.chat-container {
    display: flex;
    flex-direction: column;
    height: calc(100vh - 200px);
}

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

.chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: 20px;
    background: var(--light-bg);
    border-radius: 8px;
    margin-bottom: 15px;
}

.message {
    margin-bottom: 15px;
    display: flex;
    flex-direction: column;
}

.message.user {
    align-items: flex-end;
}

.message.bot {
    align-items: flex-start;
}

.message-content {
    max-width: 70%;
    padding: 12px 16px;
    border-radius: 12px;
    word-wrap: break-word;
}

.message.user .message-content {
    background: var(--primary-color);
    color: white;
}

.message.bot .message-content {
    background: white;
    border: 1px solid var(--border-color);
}

.message-time {
    font-size: 11px;
    color: var(--text-muted);
    margin-top: 5px;
}

.chat-input-container {
    display: flex;
    gap: 10px;
}

.chat-input {
    flex: 1;
    padding: 12px 16px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 14px;
}

.chat-input:focus {
    outline: none;
    border-color: var(--primary-color);
}

/* 结果框 */
.result-box {
    margin-top: 20px;
    padding: 20px;
    background: var(--light-bg);
    border-radius: 8px;
}

.result-box h4 {
    margin-bottom: 15px;
    color: var(--text-primary);
}

.result-box > div {
    line-height: 1.6;
}

/* 活动列表 */
.activity-list {
    max-height: 400px;
    overflow-y: auto;
}

.activity-item {
    padding: 12px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.activity-item:last-child {
    border-bottom: none;
}

.activity-time {
    font-size: 12px;
    color: var(--text-muted);
}

/* 加载遮罩 */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    color: white;
}

.loading-spinner {
    border: 4px solid rgba(255, 255, 255, 0.3);
    border-top: 4px solid white;
    border-radius: 50%;
    width: 40px;
    height: 40px;
    animation: spin 1s linear infinite;
    margin-bottom: 15px;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Toast通知 */
.toast {
    position: fixed;
    bottom: 30px;
    right: 30px;
    padding: 15px 25px;
    background: var(--dark-bg);
    color: white;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    z-index: 1001;
    animation: slideIn 0.3s ease;
}

@keyframes slideIn {
    from {
        transform: translateX(100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

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

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

/* 响应式 */
@media (max-width: 768px) {
    .sidebar {
        width: 60px;
    }

    .logo h2,
    .logo p,
    .nav-item span:not(.icon) {
        display: none;
    }

    .nav-item {
        justify-content: center;
        padding: 15px;
    }

    .stat-grid,
    .quick-actions {
        grid-template-columns: 1fr;
    }

    .dashboard-grid {
        grid-template-columns: 1fr;
    }
}

/* 文本颜色 */
.text-muted {
    color: var(--text-muted);
}

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

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