/* ==================== CSS变量 ==================== */
:root {
    --primary-color: #3B82F6;
    --primary-hover: #2563EB;
    --secondary-color: #1E40AF;
    --bg-dark: #0F172A;
    --bg-darker: #020617;
    --bg-card: #1E293B;
    --bg-card-hover: #334155;
    --bg-input: #0F172A;
    --text-primary: #F8FAFC;
    --text-secondary: #94A3B8;
    --text-muted: #64748B;
    --border-color: #334155;
    --success-color: #22C55E;
    --warning-color: #EAB308;
    --danger-color: #EF4444;
    --info-color: #06B6D4;
    --sidebar-width: 260px;
    --header-height: 64px;
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.5);
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;
}

/* ==================== 全局重置 ==================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html, body {
    height: 100%;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    background: var(--bg-dark);
    color: var(--text-primary);
    line-height: 1.6;
    overflow: hidden;
}

a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--primary-hover);
}

/* ==================== 滚动条样式 ==================== */
::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}

::-webkit-scrollbar-track {
    background: var(--bg-dark);
}

::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}

/* ==================== 布局容器 ==================== */
.app-container {
    display: flex;
    height: 100vh;
    overflow: hidden;
}

/* ==================== 侧边栏 ==================== */
.sidebar {
    width: var(--sidebar-width);
    min-width: var(--sidebar-width);
    background: var(--bg-darker);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    z-index: 100;
    transition: transform var(--transition-normal);
}

.sidebar-header {
    height: var(--header-height);
    display: flex;
    align-items: center;
    padding: 0 20px;
    border-bottom: 1px solid var(--border-color);
}

.sidebar-logo {
    display: flex;
    align-items: center;
    gap: 12px;
}

.sidebar-logo-icon {
    width: 36px;
    height: 36px;
    background: linear-gradient(135deg, var(--primary-color), var(--info-color));
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2em;
}

.sidebar-logo-text {
    font-size: 1.1em;
    font-weight: 600;
    color: var(--text-primary);
}

.sidebar-nav {
    flex: 1;
    padding: 16px 12px;
    overflow-y: auto;
}

.nav-section {
    margin-bottom: 24px;
}

.nav-section-title {
    font-size: 0.75em;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: 0 12px;
    margin-bottom: 8px;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 12px;
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
    margin-bottom: 4px;
}

.nav-item:hover {
    background: var(--bg-card);
    color: var(--text-primary);
}

.nav-item.active {
    background: var(--primary-color);
    color: white;
}

.nav-item-icon {
    width: 20px;
    text-align: center;
    font-size: 1.1em;
}

.nav-item-text {
    font-size: 0.95em;
    font-weight: 500;
}

.nav-item-badge {
    margin-left: auto;
    background: var(--danger-color);
    color: white;
    font-size: 0.75em;
    padding: 2px 8px;
    border-radius: 10px;
    font-weight: 600;
}

.sidebar-footer {
    padding: 16px 12px;
    border-top: 1px solid var(--border-color);
}

.sidebar-user {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 8px 12px;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: background var(--transition-fast);
}

.sidebar-user:hover {
    background: var(--bg-card);
}

.sidebar-user-avatar {
    width: 36px;
    height: 36px;
    background: linear-gradient(135deg, var(--primary-color), var(--info-color));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 0.9em;
}

.sidebar-user-info {
    flex: 1;
    min-width: 0;
}

.sidebar-user-name {
    font-size: 0.9em;
    font-weight: 500;
    color: var(--text-primary);
}

.sidebar-user-role {
    font-size: 0.75em;
    color: var(--text-muted);
}

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

/* ==================== 顶部导航 ==================== */
.header {
    height: var(--header-height);
    min-height: var(--header-height);
    background: var(--bg-darker);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    padding: 0 24px;
    gap: 20px;
}

.header-search {
    flex: 1;
    max-width: 400px;
    position: relative;
}

.header-search input {
    width: 100%;
    padding: 8px 16px 8px 40px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 0.9em;
    transition: all var(--transition-fast);
}

.header-search input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.2);
}

.header-search input::placeholder {
    color: var(--text-muted);
}

.header-search-icon {
    position: absolute;
    left: 12px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-left: auto;
}

.header-btn {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-md);
    border: none;
    background: transparent;
    color: var(--text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1em;
    transition: all var(--transition-fast);
    position: relative;
}

.header-btn:hover {
    background: var(--bg-card);
    color: var(--text-primary);
}

.header-btn .badge {
    position: absolute;
    top: 8px;
    right: 8px;
    width: 8px;
    height: 8px;
    background: var(--danger-color);
    border-radius: 50%;
}

.header-user {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 6px 12px;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: background var(--transition-fast);
}

.header-user:hover {
    background: var(--bg-card);
}

.header-user-avatar {
    width: 32px;
    height: 32px;
    background: linear-gradient(135deg, var(--primary-color), var(--info-color));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 0.85em;
}

/* ==================== 页面内容 ==================== */
.page-content {
    flex: 1;
    padding: 24px;
    overflow-y: auto;
    background: var(--bg-dark);
}

/* ==================== 卡片样式 ==================== */
.card {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    padding: 20px;
    margin-bottom: 20px;
    transition: all var(--transition-fast);
}

.card:hover {
    border-color: var(--primary-color);
    box-shadow: var(--shadow-md);
}

.card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 16px;
}

.card-title {
    font-size: 1.1em;
    font-weight: 600;
    color: var(--text-primary);
}

.card-subtitle {
    font-size: 0.85em;
    color: var(--text-muted);
}

/* ==================== 统计卡片 ==================== */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    margin-bottom: 24px;
}

.stat-card {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    padding: 20px;
    transition: all var(--transition-fast);
}

.stat-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.stat-card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 12px;
}

.stat-card-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.4em;
}

.stat-card-icon.blue {
    background: rgba(59, 130, 246, 0.2);
    color: var(--primary-color);
}

.stat-card-icon.green {
    background: rgba(34, 197, 94, 0.2);
    color: var(--success-color);
}

.stat-card-icon.yellow {
    background: rgba(234, 179, 8, 0.2);
    color: var(--warning-color);
}

.stat-card-icon.red {
    background: rgba(239, 68, 68, 0.2);
    color: var(--danger-color);
}

.stat-card-icon.cyan {
    background: rgba(6, 182, 212, 0.2);
    color: var(--info-color);
}

.stat-card-change {
    font-size: 0.85em;
    padding: 4px 8px;
    border-radius: var(--radius-sm);
}

.stat-card-change.positive {
    background: rgba(34, 197, 94, 0.2);
    color: var(--success-color);
}

.stat-card-change.negative {
    background: rgba(239, 68, 68, 0.2);
    color: var(--danger-color);
}

.stat-card-value {
    font-size: 2em;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.stat-card-label {
    font-size: 0.9em;
    color: var(--text-secondary);
}

/* ==================== 按钮样式 ==================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 20px;
    border-radius: var(--radius-md);
    font-size: 0.95em;
    font-weight: 500;
    cursor: pointer;
    border: none;
    transition: all var(--transition-fast);
}

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

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

.btn-secondary {
    background: var(--bg-card);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background: var(--bg-card-hover);
}

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

.btn-success:hover {
    background: #16A34A;
}

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

.btn-danger:hover {
    background: #DC2626;
}

.btn-ghost {
    background: transparent;
    color: var(--text-secondary);
}

.btn-ghost:hover {
    background: var(--bg-card);
    color: var(--text-primary);
}

.btn-sm {
    padding: 6px 12px;
    font-size: 0.85em;
}

.btn-lg {
    padding: 14px 28px;
    font-size: 1.05em;
}

/* ==================== 输入框样式 ==================== */
.form-group {
    margin-bottom: 20px;
}

.form-label {
    display: block;
    font-size: 0.9em;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.form-input,
.form-select,
.form-textarea {
    width: 100%;
    padding: 10px 14px;
    background: var(--bg-input);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 0.95em;
    transition: all var(--transition-fast);
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.2);
}

.form-input::placeholder,
.form-textarea::placeholder {
    color: var(--text-muted);
}

.form-textarea {
    min-height: 120px;
    resize: vertical;
}

.form-select {
    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'%3E%3Cpath fill='%2394A3B8' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
    padding-right: 36px;
}

/* ==================== 表格样式 ==================== */
.table-container {
    overflow-x: auto;
}

.table {
    width: 100%;
    border-collapse: collapse;
}

.table th,
.table td {
    padding: 12px 16px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.table th {
    background: var(--bg-dark);
    font-weight: 600;
    color: var(--text-secondary);
    font-size: 0.85em;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

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

/* ==================== 标签/徽章 ==================== */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 4px 10px;
    border-radius: 20px;
    font-size: 0.8em;
    font-weight: 500;
}

.badge-success {
    background: rgba(34, 197, 94, 0.2);
    color: var(--success-color);
}

.badge-warning {
    background: rgba(234, 179, 8, 0.2);
    color: var(--warning-color);
}

.badge-danger {
    background: rgba(239, 68, 68, 0.2);
    color: var(--danger-color);
}

.badge-info {
    background: rgba(6, 182, 212, 0.2);
    color: var(--info-color);
}

/* ==================== 短信发送页面 ==================== */
.send-container {
    display: grid;
    grid-template-columns: 350px 1fr;
    gap: 20px;
    height: calc(100vh - var(--header-height) - 48px);
}

.send-sidebar {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.send-sidebar-header {
    padding: 16px;
    border-bottom: 1px solid var(--border-color);
}

.send-sidebar-title {
    font-size: 1.1em;
    font-weight: 600;
    margin-bottom: 12px;
}

.send-sidebar-search {
    position: relative;
}

.send-sidebar-search input {
    width: 100%;
    padding: 8px 12px 8px 36px;
    background: var(--bg-input);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 0.9em;
}

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

.send-sidebar-search-icon {
    position: absolute;
    left: 12px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
}

.contact-list {
    flex: 1;
    overflow-y: auto;
    padding: 8px;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: background var(--transition-fast);
}

.contact-item:hover {
    background: var(--bg-card-hover);
}

.contact-item.active {
    background: var(--primary-color);
}

.contact-avatar {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-color), var(--info-color));
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 1em;
    flex-shrink: 0;
}

.contact-info {
    flex: 1;
    min-width: 0;
}

.contact-name {
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: 2px;
}

.contact-phone {
    font-size: 0.85em;
    color: var(--text-muted);
}

.contact-time {
    font-size: 0.75em;
    color: var(--text-muted);
}

/* ==================== 聊天区域 ==================== */
.send-main {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.send-main-header {
    padding: 16px 20px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.send-main-user {
    display: flex;
    align-items: center;
    gap: 12px;
}

.send-main-status {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.85em;
    color: var(--text-muted);
}

.status-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--success-color);
}

.send-main-actions {
    display: flex;
    gap: 8px;
}

/* ==================== 消息区域 ==================== */
.messages-container {
    flex: 1;
    overflow-y: auto;
    padding: 20px;
}

.message {
    display: flex;
    gap: 12px;
    margin-bottom: 20px;
    animation: fadeIn 0.3s ease;
}

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

.message.sent {
    flex-direction: row-reverse;
}

.message-avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: var(--bg-card-hover);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.85em;
    flex-shrink: 0;
}

.message.sent .message-avatar {
    background: var(--primary-color);
}

.message-content {
    max-width: 70%;
}

.message-bubble {
    padding: 12px 16px;
    border-radius: var(--radius-lg);
    background: var(--bg-input);
    color: var(--text-primary);
    line-height: 1.5;
}

.message.sent .message-bubble {
    background: var(--primary-color);
    border-bottom-right-radius: 4px;
}

.message.received .message-bubble {
    border-bottom-left-radius: 4px;
}

.message-time {
    font-size: 0.75em;
    color: var(--text-muted);
    margin-top: 4px;
}

.message.sent .message-time {
    text-align: right;
}

/* ==================== 消息输入区 ==================== */
.message-input-container {
    padding: 16px 20px;
    border-top: 1px solid var(--border-color);
    background: var(--bg-card);
}

.message-input-wrapper {
    display: flex;
    align-items: flex-end;
    gap: 12px;
    background: var(--bg-input);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 12px;
}

.message-input {
    flex: 1;
    border: none;
    background: transparent;
    color: var(--text-primary);
    font-size: 0.95em;
    resize: none;
    max-height: 120px;
    line-height: 1.5;
}

.message-input:focus {
    outline: none;
}

.message-input::placeholder {
    color: var(--text-muted);
}

.message-input-actions {
    display: flex;
    gap: 8px;
}

.message-input-btn {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-md);
    border: none;
    background: transparent;
    color: var(--text-muted);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
}

.message-input-btn:hover {
    background: var(--bg-card);
    color: var(--text-primary);
}

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

.message-input-btn.send:hover {
    background: var(--primary-hover);
}

/* ==================== 工具栏 ==================== */
.toolbar {
    display: flex;
    gap: 8px;
    padding: 8px 0;
}

.toolbar-btn {
    width: 32px;
    height: 32px;
    border-radius: var(--radius-sm);
    border: none;
    background: transparent;
    color: var(--text-muted);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
}

.toolbar-btn:hover {
    background: var(--bg-card);
    color: var(--text-primary);
}

/* ==================== 空状态 ==================== */
.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    color: var(--text-muted);
    text-align: center;
    padding: 40px;
}

.empty-state-icon {
    font-size: 4em;
    margin-bottom: 16px;
    opacity: 0.5;
}

.empty-state-title {
    font-size: 1.2em;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.empty-state-text {
    font-size: 0.9em;
    max-width: 300px;
}

/* ==================== 提示框 ==================== */
.alert {
    padding: 12px 16px;
    border-radius: var(--radius-md);
    margin-bottom: 16px;
    display: flex;
    align-items: center;
    gap: 10px;
    animation: slideDown 0.3s ease;
}

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

.alert-success {
    background: rgba(34, 197, 94, 0.15);
    border: 1px solid rgba(34, 197, 94, 0.3);
    color: var(--success-color);
}

.alert-error {
    background: rgba(239, 68, 68, 0.15);
    border: 1px solid rgba(239, 68, 68, 0.3);
    color: var(--danger-color);
}

.alert-warning {
    background: rgba(234, 179, 8, 0.15);
    border: 1px solid rgba(234, 179, 8, 0.3);
    color: var(--warning-color);
}

.alert-info {
    background: rgba(6, 182, 212, 0.15);
    border: 1px solid rgba(6, 182, 212, 0.3);
    color: var(--info-color);
}

/* ==================== 加载动画 ==================== */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 2px solid var(--border-color);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

/* ==================== 响应式 ==================== */
@media (max-width: 1200px) {
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 900px) {
    .sidebar {
        position: fixed;
        left: 0;
        top: 0;
        bottom: 0;
        transform: translateX(-100%);
        z-index: 1000;
    }

    .sidebar.open {
        transform: translateX(0);
    }

    .sidebar-overlay {
        display: none;
        position: fixed;
        inset: 0;
        background: rgba(0, 0, 0, 0.5);
        z-index: 999;
    }

    .sidebar-overlay.active {
        display: block;
    }

    .send-container {
        grid-template-columns: 1fr;
    }

    .send-sidebar {
        display: none;
    }

    .send-sidebar.active {
        display: flex;
        position: fixed;
        left: 0;
        top: var(--header-height);
        bottom: 0;
        width: 350px;
        z-index: 900;
    }

    .header-menu-btn {
        display: flex;
    }

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

@media (max-width: 600px) {
    .page-content {
        padding: 16px;
    }

    .stat-card-value {
        font-size: 1.5em;
    }

    .message-content {
        max-width: 85%;
    }
}

/* ==================== 工具类 ==================== */
.hidden {
    display: none !important;
}

.flex {
    display: flex;
}

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

.items-center {
    align-items: center;
}

.justify-center {
    justify-content: center;
}

.justify-between {
    justify-content: space-between;
}

.gap-1 { gap: 4px; }
.gap-2 { gap: 8px; }
.gap-3 { gap: 12px; }
.gap-4 { gap: 16px; }

.mt-1 { margin-top: 4px; }
.mt-2 { margin-top: 8px; }
.mt-3 { margin-top: 12px; }
.mt-4 { margin-top: 16px; }

.mb-1 { margin-bottom: 4px; }
.mb-2 { margin-bottom: 8px; }
.mb-3 { margin-bottom: 12px; }
.mb-4 { margin-bottom: 16px; }

.text-center { text-align: center; }
.text-right { text-align: right; }
.text-sm { font-size: 0.85em; }
.text-muted { color: var(--text-muted); }
.font-bold { font-weight: 700; }