/* ===== 全局样式 ===== */
:root {
    --primary: #2563eb;
    --primary-dark: #1e40af;
    --success: #16a34a;
    --warning: #d97706;
    --danger: #dc2626;
    --info: #0891b2;
    --bg-main: #f0f2f5;
    --bg-card: #ffffff;
    --bg-sidebar: #1e293b;
    --bg-sidebar-hover: #334155;
    --text-main: #1e293b;
    --text-muted: #64748b;
    --text-sidebar: #cbd5e1;
    --text-sidebar-active: #ffffff;
    --border-color: #e2e8f0;
    --shadow: 0 1px 3px rgba(0,0,0,0.08);
    --shadow-lg: 0 4px 12px rgba(0,0,0,0.1);
    --radius: 8px;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'Microsoft YaHei', sans-serif;
    background: var(--bg-main);
    color: var(--text-main);
    font-size: 14px;
    line-height: 1.6;
}

/* ===== 布局 ===== */
.app-container { display: flex; min-height: 100vh; }

.sidebar {
    width: 240px;
    background: var(--bg-sidebar);
    color: var(--text-sidebar);
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    overflow-y: auto;
    z-index: 1000;
    transition: transform 0.3s;
}

.sidebar-header {
    padding: 20px;
    text-align: center;
    border-bottom: 1px solid rgba(255,255,255,0.1);
}

.sidebar-header h2 {
    color: #fff;
    font-size: 18px;
    font-weight: 700;
}

.sidebar-header p {
    font-size: 12px;
    color: var(--text-muted);
    margin-top: 4px;
}

.sidebar-nav {
    padding: 12px 0;
}

.sidebar-nav .nav-item {
    display: flex;
    align-items: center;
    padding: 10px 20px;
    color: var(--text-sidebar);
    text-decoration: none;
    transition: all 0.2s;
    border-left: 3px solid transparent;
}

.sidebar-nav .nav-item:hover {
    background: var(--bg-sidebar-hover);
    color: #fff;
}

.sidebar-nav .nav-item.active {
    background: var(--bg-sidebar-hover);
    color: var(--text-sidebar-active);
    border-left-color: var(--primary);
}

.sidebar-nav .nav-item .icon {
    width: 20px;
    margin-right: 10px;
    text-align: center;
    font-size: 16px;
}

.sidebar-nav .nav-section {
    padding: 12px 20px 6px;
    font-size: 11px;
    text-transform: uppercase;
    color: var(--text-muted);
    font-weight: 600;
}

.main-content {
    flex: 1;
    margin-left: 240px;
    padding: 24px;
    min-height: 100vh;
}

.page-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
}

.page-header h1 {
    font-size: 24px;
    font-weight: 700;
}

.page-header .actions {
    display: flex;
    gap: 8px;
}

/* ===== 卡片 ===== */
.card {
    background: var(--bg-card);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    margin-bottom: 20px;
    overflow: hidden;
}

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

.card-header h3 {
    font-size: 16px;
    font-weight: 600;
}

.card-body { padding: 20px; }

/* ===== 统计卡片 ===== */
.stat-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 16px;
    margin-bottom: 24px;
}

.stat-card {
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 20px;
    box-shadow: var(--shadow);
    display: flex;
    align-items: center;
    gap: 16px;
}

.stat-card .stat-icon {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 22px;
    color: #fff;
}

.stat-card .stat-icon.blue { background: var(--primary); }
.stat-card .stat-icon.green { background: var(--success); }
.stat-card .stat-icon.orange { background: var(--warning); }
.stat-card .stat-icon.red { background: var(--danger); }
.stat-card .stat-icon.cyan { background: var(--info); }
.stat-card .stat-icon.purple { background: #7c3aed; }

.stat-card .stat-info h4 {
    font-size: 28px;
    font-weight: 700;
    line-height: 1.2;
}

.stat-card .stat-info p {
    font-size: 13px;
    color: var(--text-muted);
}

/* ===== 按钮 ===== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 16px;
    border: none;
    border-radius: 6px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    text-decoration: none;
    white-space: nowrap;
}

.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); }
.btn-success { background: var(--success); color: #fff; }
.btn-success:hover { background: #15803d; }
.btn-danger { background: var(--danger); color: #fff; }
.btn-danger:hover { background: #b91c1c; }
.btn-warning { background: var(--warning); color: #fff; }
.btn-warning:hover { background: #b45309; }
.btn-secondary { background: #e2e8f0; color: var(--text-main); }
.btn-secondary:hover { background: #cbd5e1; }
.btn-sm { padding: 4px 10px; font-size: 12px; }
.btn-lg { padding: 12px 24px; font-size: 16px; }

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

table {
    width: 100%;
    border-collapse: collapse;
    font-size: 13px;
}

table thead {
    background: #f8fafc;
}

table th {
    padding: 12px 16px;
    text-align: left;
    font-weight: 600;
    color: var(--text-muted);
    border-bottom: 2px solid var(--border-color);
    white-space: nowrap;
}

table td {
    padding: 10px 16px;
    border-bottom: 1px solid var(--border-color);
    vertical-align: middle;
}

table tbody tr:hover {
    background: #f8fafc;
}

/* ===== 标签 ===== */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 2px 10px;
    border-radius: 12px;
    font-size: 12px;
    font-weight: 500;
}

.badge-success { background: #dcfce7; color: #166534; }
.badge-danger { background: #fee2e2; color: #991b1b; }
.badge-warning { background: #fef3c7; color: #92400e; }
.badge-info { background: #e0f2fe; color: #075985; }
.badge-secondary { background: #f1f5f9; color: #475569; }
.badge-primary { background: #dbeafe; color: #1e40af; }

/* ===== 表单 ===== */
.form-group {
    margin-bottom: 16px;
}

.form-group label {
    display: block;
    margin-bottom: 6px;
    font-weight: 500;
    font-size: 13px;
}

.form-group label .required { color: var(--danger); }

.form-control {
    width: 100%;
    padding: 8px 12px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 14px;
    transition: border-color 0.2s;
    background: #fff;
}

.form-control:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

textarea.form-control {
    min-height: 80px;
    font-family: 'Courier New', monospace;
    font-size: 12px;
}

select.form-control {
    cursor: pointer;
}

.form-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 16px;
}

/* ===== 模态框 ===== */
.modal-overlay {
    display: none;
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(0,0,0,0.5);
    z-index: 2000;
    justify-content: center;
    align-items: flex-start;
    padding-top: 60px;
}

.modal-overlay.show { display: flex; }

.modal {
    background: #fff;
    border-radius: var(--radius);
    width: 90%;
    max-width: 600px;
    max-height: 80vh;
    overflow-y: auto;
    box-shadow: var(--shadow-lg);
}

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

.modal-header h3 { font-size: 18px; }

.modal-close {
    background: none;
    border: none;
    font-size: 24px;
    cursor: pointer;
    color: var(--text-muted);
    line-height: 1;
}

.modal-body { padding: 20px; }

.modal-footer {
    padding: 16px 20px;
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: flex-end;
    gap: 8px;
}

/* ===== 状态指示器 ===== */
.status-dot {
    display: inline-block;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    margin-right: 6px;
}

.status-dot.online { background: var(--success); box-shadow: 0 0 6px var(--success); }
.status-dot.offline { background: var(--danger); }
.status-dot.idle { background: var(--warning); }

/* ===== 价格颜色 ===== */
.price-low { color: var(--success); font-weight: 600; }
.price-high { color: var(--danger); font-weight: 600; }
.price-normal { color: var(--text-main); }

/* ===== 登录页 ===== */
.login-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #1e293b 0%, #334155 100%);
}

.login-box {
    background: #fff;
    border-radius: 12px;
    padding: 40px;
    width: 380px;
    box-shadow: 0 20px 60px rgba(0,0,0,0.3);
}

.login-box h1 {
    text-align: center;
    margin-bottom: 8px;
    font-size: 22px;
}

.login-box .subtitle {
    text-align: center;
    color: var(--text-muted);
    margin-bottom: 24px;
    font-size: 13px;
}

.login-box .form-group { margin-bottom: 20px; }

.login-box .btn-primary { width: 100%; justify-content: center; padding: 12px; }

/* ===== Toast ===== */
.toast {
    position: fixed;
    top: 20px;
    right: 20px;
    padding: 12px 20px;
    border-radius: 8px;
    color: #fff;
    font-size: 14px;
    z-index: 3000;
    box-shadow: 0 4px 12px rgba(0,0,0,0.2);
    animation: slideIn 0.3s ease;
}

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

.toast.success { background: var(--success); }
.toast.error { background: var(--danger); }
.toast.warning { background: var(--warning); }
.toast.info { background: var(--info); }

/* ===== 其他 ===== */
.text-center { text-align: center; }
.text-right { text-align: right; }
.text-muted { color: var(--text-muted); }
.text-success { color: var(--success); }
.text-danger { color: var(--danger); }
.text-warning { color: var(--warning); }
.mt-2 { margin-top: 8px; }
.mt-3 { margin-top: 12px; }
.mt-4 { margin-top: 16px; }
.mb-2 { margin-bottom: 8px; }
.mb-3 { margin-bottom: 12px; }
.mb-4 { margin-bottom: 16px; }
.flex { display: flex; }
.gap-2 { gap: 8px; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.w-full { width: 100%; }
.hidden { display: none !important; }
.cursor-pointer { cursor: pointer; }
.mono { font-family: 'Courier New', monospace; }
.nowrap { white-space: nowrap; }

/* ===== 响应式 ===== */
@media (max-width: 768px) {
    .sidebar { transform: translateX(-240px); }
    .sidebar.show { transform: translateX(0); }
    .main-content { margin-left: 0; padding: 16px; }
    .stat-grid { grid-template-columns: 1fr; }
}