/* ============================================
   招标信息查询平台 - 现代化主题 v4.0
   设计原则：简洁大气、数据优先、层次清晰
   ============================================ */

/* ---------- CSS变量 ---------- */
:root {
    /* 主色调 - 深蓝科技风 */
    --primary: #1e40af;
    --primary-light: #3b82f6;
    --primary-dark: #1e3a8a;
    --primary-bg: #eff6ff;
    
    /* 辅助色 */
    --success: #059669;
    --success-bg: #ecfdf5;
    --warning: #d97706;
    --warning-bg: #fffbeb;
    --danger: #dc2626;
    --danger-bg: #fef2f2;
    --info: #0891b2;
    --info-bg: #ecfeff;
    --purple: #7c3aed;
    --purple-bg: #f5f3ff;
    
    /* 中性色 */
    --text-primary: #0f172a;
    --text-secondary: #64748b;
    --text-muted: #94a3b8;
    --border: #e2e8f0;
    --border-light: #f1f5f9;
    --bg-page: #f8fafc;
    --bg-card: #ffffff;
    --bg-hover: #f8fafc;
    
    /* 阴影 */
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
    --shadow: 0 1px 3px rgba(0,0,0,0.1), 0 1px 2px rgba(0,0,0,0.06);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -1px rgba(0,0,0,0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -2px rgba(0,0,0,0.05);
    
    /* 圆角 */
    --radius-sm: 6px;
    --radius: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    
    /* 导航 */
    --nav-height: 60px;
    --nav-bg: linear-gradient(135deg, #1e3a8a 0%, #1e40af 50%, #2563eb 100%);
}

/* ---------- 全局重置 ---------- */
* { margin: 0; padding: 0; box-sizing: border-box; }
html { font-size: 14px; }
body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
    background: var(--bg-page);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}
a { color: var(--primary); text-decoration: none; transition: color 0.2s; }
a:hover { color: var(--primary-dark); }

/* ---------- 导航栏 ---------- */
.navbar {
    background: linear-gradient(135deg, #0f172a 0%, #1e293b 50%, #0f172a 100%);
    height: 60px;
    display: flex;
    align-items: center;
    padding: 0 28px;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 4px 20px rgba(0,0,0,0.3), inset 0 -1px 0 rgba(255,255,255,0.05);
    border-bottom: 1px solid rgba(59,130,246,0.2);
}
.navbar-brand {
    display: flex;
    align-items: center;
    gap: 12px;
    color: #fff;
    font-size: 18px;
    font-weight: 700;
    margin-right: 36px;
    white-space: nowrap;
    cursor: pointer;
    user-select: none;
    letter-spacing: 0.5px;
}
.navbar-brand-logo {
    width: 38px;
    height: 38px;
    background: linear-gradient(135deg, #3b82f6, #8b5cf6, #06b6d4);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    box-shadow: 0 4px 15px rgba(59,130,246,0.4), inset 0 1px 0 rgba(255,255,255,0.2);
}
.navbar-menu {
    display: flex;
    align-items: center;
    gap: 2px;
    flex: 1;
}
.nav-item {
    position: relative;
}
.nav-item > a, .nav-item > .nav-trigger {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 10px 16px;
    color: rgba(255,255,255,0.7);
    font-size: 14px;
    font-weight: 500;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.25s;
    white-space: nowrap;
    position: relative;
}
.nav-item > a:hover, .nav-item > .nav-trigger:hover {
    background: rgba(59,130,246,0.15);
    color: #fff;
}
.nav-item.active > a {
    background: linear-gradient(135deg, rgba(59,130,246,0.3), rgba(139,92,246,0.2));
    color: #fff;
    font-weight: 600;
    box-shadow: 0 2px 10px rgba(59,130,246,0.2);
}
.nav-item .arrow {
    font-size: 9px;
    transition: transform 0.25s;
    color: rgba(255,255,255,0.5);
}
.nav-dropdown {
    position: absolute;
    top: calc(100% + 10px);
    left: 0;
    min-width: 220px;
    background: rgba(15,23,42,0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-radius: 14px;
    box-shadow: 0 20px 50px rgba(0,0,0,0.4), 0 0 0 1px rgba(59,130,246,0.15);
    padding: 10px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px) scale(0.98);
    transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 1001;
}
.nav-dropdown::before {
    content: '';
    position: absolute;
    top: -5px;
    left: 28px;
    width: 14px;
    height: 14px;
    background: rgba(15,23,42,0.95);
    transform: rotate(45deg);
    border-left: 1px solid rgba(59,130,246,0.15);
    border-top: 1px solid rgba(59,130,246,0.15);
}
.nav-dropdown-wide {
    min-width: 580px;
    display: flex;
    gap: 12px;
    padding: 20px;
}
.nav-dropdown a {
    display: block;
    padding: 10px 14px;
    color: rgba(255,255,255,0.75);
    font-size: 13px;
    border-radius: 8px;
    transition: all 0.2s;
}
.nav-dropdown a:hover {
    background: rgba(59,130,246,0.2);
    color: #fff;
    transform: translateX(4px);
}
.dropdown-group {
    flex: 1;
    min-width: 0;
}
.dropdown-group-title {
    font-size: 11px;
    font-weight: 700;
    color: rgba(59,130,246,0.9);
    text-transform: uppercase;
    letter-spacing: 1px;
    padding: 6px 14px 10px;
    border-bottom: 1px solid rgba(59,130,246,0.1);
    margin-bottom: 6px;
}
.dropdown-divider {
    height: 1px;
    background: rgba(255,255,255,0.08);
    margin: 8px 10px;
}
.navbar-right {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-left: auto;
}
.user-info {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 6px 14px 6px 6px;
    border-radius: 24px;
    background: rgba(255,255,255,0.08);
    transition: all 0.25s;
    border: 1px solid rgba(255,255,255,0.1);
}
.user-info:hover {
    background: rgba(255,255,255,0.12);
    border-color: rgba(59,130,246,0.3);
}
.user-avatar {
    width: 30px;
    height: 30px;
    background: linear-gradient(135deg, #3b82f6, #8b5cf6);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 13px;
    font-weight: 600;
    color: #fff;
    box-shadow: 0 2px 8px rgba(59,130,246,0.3);
}
.user-name {
    font-size: 13px;
    font-weight: 500;
    color: rgba(255,255,255,0.9);
}
.nav-actions {
    display: flex;
    gap: 4px;
}
.nav-link {
    width: 38px;
    height: 38px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 10px;
    color: rgba(255,255,255,0.7);
    font-size: 16px;
    transition: all 0.25s;
}
.nav-link:hover {
    background: rgba(255,255,255,0.1);
    color: #fff;
    transform: translateY(-1px);
}
.nav-link-danger:hover {
    background: rgba(239,68,68,0.2);
    color: #f87171;
}
.mobile-menu-btn {
    display: none;
    width: 42px;
    height: 42px;
    align-items: center;
    justify-content: center;
    background: rgba(255,255,255,0.1);
    border: 1px solid rgba(255,255,255,0.15);
    border-radius: 10px;
    color: #fff;
    font-size: 20px;
    cursor: pointer;
    margin-right: 12px;
    transition: all 0.25s;
}
.mobile-menu-btn:hover {
    background: rgba(255,255,255,0.15);
}
/* ---------- 主容器 ---------- */
.main-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 24px;
    min-height: calc(100vh - var(--nav-height) - 60px);
}

/* ---------- 页头 ---------- */
.page-header {
    margin-bottom: 24px;
}
.page-title {
    font-size: 24px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 4px;
}
.page-subtitle {
    font-size: 14px;
    color: var(--text-secondary);
}

/* ---------- 卡片 ---------- */
.card {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-light);
    margin-bottom: 20px;
    overflow: hidden;
    transition: box-shadow 0.2s;
}
.card:hover { box-shadow: var(--shadow); }
.card-header {
    padding: 16px 20px;
    border-bottom: 1px solid var(--border-light);
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: linear-gradient(to right, #fafbfc, #fff);
}
.card-title {
    font-size: 15px;
    font-weight: 600;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 8px;
}
.card-body { padding: 20px; }

/* ---------- KPI卡片 ---------- */
.kpi-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 16px;
    margin-bottom: 20px;
}
.kpi-card {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: 20px;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-light);
    border-left: 4px solid var(--primary);
    transition: all 0.2s;
}
.kpi-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-md); }
.kpi-value {
    font-size: 28px;
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1.2;
    margin-bottom: 4px;
}
.kpi-label {
    font-size: 13px;
    color: var(--text-secondary);
}
.kpi-blue { border-left-color: var(--primary); }
.kpi-green { border-left-color: var(--success); }
.kpi-orange { border-left-color: var(--warning); }
.kpi-red { border-left-color: var(--danger); }
.kpi-purple { border-left-color: var(--purple); }
.kpi-cyan { border-left-color: var(--info); }

/* ---------- 表格 ---------- */
.table-container {
    overflow-x: auto;
}
.data-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 13px;
}
.data-table thead {
    background: #f8fafc;
}
.data-table th {
    padding: 12px 14px;
    text-align: left;
    font-weight: 600;
    color: var(--text-secondary);
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    border-bottom: 2px solid var(--border);
    white-space: nowrap;
}
.data-table td {
    padding: 12px 14px;
    border-bottom: 1px solid var(--border-light);
    color: var(--text-primary);
}
.data-table tbody tr {
    transition: background 0.15s;
}
.data-table tbody tr:hover {
    background: var(--primary-bg);
}
.data-table .loading, .data-table .empty-state {
    text-align: center;
    padding: 40px;
    color: var(--text-muted);
}

/* ---------- 按钮 ---------- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 8px 16px;
    font-size: 13px;
    font-weight: 500;
    border-radius: var(--radius-sm);
    border: 1px solid transparent;
    cursor: pointer;
    transition: all 0.2s;
    white-space: nowrap;
    text-decoration: none;
}
.btn-primary {
    background: var(--primary);
    color: #fff;
}
.btn-primary:hover { background: var(--primary-dark); color: #fff; }
.btn-success { background: var(--success); color: #fff; }
.btn-success:hover { background: #047857; color: #fff; }
.btn-warning { background: var(--warning); color: #fff; }
.btn-danger { background: var(--danger); color: #fff; }
.btn-danger:hover { background: #b91c1c; color: #fff; }
.btn-outline {
    background: #fff;
    color: var(--primary);
    border-color: var(--border);
}
.btn-outline:hover { border-color: var(--primary); background: var(--primary-bg); }
.btn-sm { padding: 4px 10px; font-size: 12px; }
.btn-xs { padding: 2px 8px; font-size: 11px; min-height: 24px; border-radius: 4px; }
.btn-lg { padding: 10px 24px; font-size: 15px; }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }

/* ---------- 表单 ---------- */
.form-group { margin-bottom: 16px; }
.form-label {
    display: block;
    font-size: 13px;
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: 6px;
}
.form-input, .form-select, .form-textarea {
    width: 100%;
    padding: 8px 12px;
    font-size: 13px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    background: #fff;
    color: var(--text-primary);
    transition: all 0.2s;
    font-family: inherit;
}
.form-input:focus, .form-select:focus, .form-textarea:focus {
    outline: none;
    border-color: var(--primary-light);
    box-shadow: 0 0 0 3px rgba(59,130,246,0.1);
}
.form-select {
    cursor: pointer;
    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='%2364748b' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 10px center;
    padding-right: 30px;
}

/* ---------- 徽章 ---------- */
.badge {
    display: inline-block;
    padding: 2px 8px;
    font-size: 11px;
    font-weight: 600;
    border-radius: 10px;
    line-height: 1.5;
}
.badge-primary { background: var(--primary-bg); color: var(--primary); }
.badge-success { background: var(--success-bg); color: var(--success); }
.badge-warning { background: var(--warning-bg); color: var(--warning); }
.badge-danger { background: var(--danger-bg); color: var(--danger); }
.badge-info { background: var(--info-bg); color: var(--info); }

/* ---------- 网格布局 ---------- */
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.grid-3 { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 20px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }

/* ---------- 标签页 ---------- */
.tabs {
    display: flex;
    gap: 4px;
    border-bottom: 2px solid var(--border);
    margin-bottom: 20px;
}
.tab {
    padding: 10px 20px;
    font-size: 14px;
    font-weight: 500;
    color: var(--text-secondary);
    cursor: pointer;
    border-bottom: 2px solid transparent;
    margin-bottom: -2px;
    transition: all 0.2s;
}
.tab:hover { color: var(--primary); }
.tab.active {
    color: var(--primary);
    border-bottom-color: var(--primary);
}

/* ---------- 提示消息 ---------- */
.toast {
    position: fixed;
    top: 80px;
    right: 24px;
    padding: 12px 20px;
    border-radius: var(--radius);
    box-shadow: var(--shadow-lg);
    z-index: 9999;
    animation: slideIn 0.3s;
    font-size: 13px;
    font-weight: 500;
}
.toast-success { background: var(--success); color: #fff; }
.toast-error { background: var(--danger); color: #fff; }
.toast-warning { background: var(--warning); color: #fff; }
@keyframes slideIn {
    from { transform: translateX(100%); opacity: 0; }
    to { transform: translateX(0); opacity: 1; }
}

/* ---------- 加载动画 ---------- */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 2px solid var(--border);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ---------- 骨架屏 ---------- */
.skeleton {
    background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
    background-size: 200% 100%;
    animation: skeleton-loading 1.5s ease-in-out infinite;
    border-radius: 4px;
}
@keyframes skeleton-loading {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}
.skeleton-line {
    height: 14px;
    margin-bottom: 10px;
    border-radius: 4px;
}
.skeleton-line.short { width: 60%; }
.skeleton-line.medium { width: 80%; }
.skeleton-line.long { width: 100%; }
.skeleton-list {
    padding: 12px 16px;
}
.skeleton-list .skeleton-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 0;
    border-bottom: 1px solid #f0f0f0;
}
.skeleton-list .skeleton-item:last-child {
    border-bottom: none;
}
.skeleton-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    flex-shrink: 0;
}
.skeleton-text {
    flex: 1;
    height: 14px;
    border-radius: 4px;
}
.skeleton-date {
    width: 70px;
    height: 12px;
    border-radius: 4px;
    flex-shrink: 0;
}
/* KPI卡片骨架 */
.skeleton-kpi {
    height: 80px;
    border-radius: 10px;
}

/* ---------- 空状态 ---------- */
.empty-state {
    text-align: center;
    padding: 48px 20px;
    color: var(--text-muted);
    font-size: 14px;
}

/* ---------- 分页 ---------- */
.pagination {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    margin-top: 20px;
    flex-wrap: wrap;
}
.pagination button, .pagination span {
    min-width: 32px;
    height: 32px;
    padding: 0 10px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 13px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    background: #fff;
    color: var(--text-primary);
    cursor: pointer;
    transition: all 0.15s;
}
.pagination button:hover { border-color: var(--primary); color: var(--primary); }
.pagination .active {
    background: var(--primary);
    color: #fff;
    border-color: var(--primary);
}
.pagination .disabled { opacity: 0.4; cursor: not-allowed; }

/* ---------- 页脚 ---------- */
.footer {
    text-align: center;
    padding: 20px;
    color: var(--text-muted);
    font-size: 12px;
    border-top: 1px solid var(--border-light);
    background: #fff;
}

/* ---------- 时间线（项目生命周期） ---------- */
.timeline {
    position: relative;
    padding-left: 32px;
}
.timeline::before {
    content: '';
    position: absolute;
    left: 14px;
    top: 8px;
    bottom: 8px;
    width: 2px;
    background: var(--border);
}
.timeline-item {
    position: relative;
    padding-bottom: 20px;
}
.timeline-item:last-child {
    padding-bottom: 0;
}
.timeline-dot {
    position: absolute;
    left: -32px;
    top: 0;
    width: 30px;
    height: 30px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    color: #fff;
    box-shadow: 0 2px 8px rgba(0,0,0,0.15);
    z-index: 1;
}
.timeline-content {
    background: var(--bg-light);
    border-radius: 8px;
    padding: 12px 16px;
    border: 1px solid var(--border-light);
}
.timeline-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 6px;
}
.timeline-stage {
    font-weight: 600;
    font-size: 13px;
}
.timeline-date {
    font-size: 12px;
    color: var(--text-tertiary);
}
.timeline-title {
    font-size: 14px;
    color: var(--text-primary);
    margin-bottom: 6px;
    line-height: 1.5;
}
.timeline-title a:hover {
    color: var(--primary);
}
.timeline-reason {
    font-size: 12px;
    color: var(--danger);
    background: rgba(255,77,79,0.08);
    padding: 6px 10px;
    border-radius: 4px;
    margin-top: 6px;
    border-left: 3px solid var(--danger);
}
.timeline-meta {
    font-size: 12px;
    color: var(--text-secondary);
    margin-top: 4px;
}

/* ---------- 模态框 ---------- */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0,0,0,0.5);
    z-index: 2000;
    overflow-y: auto;
}
.modal-content {
    background: #fff;
    border-radius: 12px;
    margin: 5vh auto;
    max-width: 600px;
    width: 90%;
    box-shadow: 0 20px 60px rgba(0,0,0,0.3);
    animation: modalSlideIn 0.2s ease;
}
@keyframes modalSlideIn {
    from { transform: translateY(-20px); opacity: 0; }
    to { transform: translateY(0); opacity: 1; }
}
.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 20px;
    border-bottom: 1px solid var(--border-light);
}
.modal-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
}
.modal-close {
    background: none;
    border: none;
    font-size: 24px;
    color: var(--text-tertiary);
    cursor: pointer;
    padding: 0;
    width: 30px;
    height: 30px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 4px;
}
.modal-close:hover {
    background: var(--bg-light);
    color: var(--text-primary);
}
.modal-body {
    padding: 20px;
    max-height: 70vh;
    overflow-y: auto;
}

/* ---------- 响应式设计（全面适配手机/平板/桌面） ---------- */

/* 超大屏（1440px以上） */
@media (min-width: 1440px) {
    .main-container { max-width: 1600px; }
    .kpi-grid { grid-template-columns: repeat(6, 1fr); }
}

/* 桌面端（1025px - 1439px） */
@media (max-width: 1439px) and (min-width: 1025px) {
    .kpi-grid { grid-template-columns: repeat(4, 1fr); }
}

/* 平板横屏/折叠屏（769px - 1600px） */
@media (max-width: 1600px) {
    .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
    .kpi-grid { grid-template-columns: repeat(3, 1fr); }
    
    /* 表格容器横向滚动 */
    .table-container { overflow-x: auto; -webkit-overflow-scrolling: touch; }
    .data-table { min-width: 600px; }
}

/* 平板竖屏/大屏手机（481px - 768px） */
@media (max-width: 768px) {
    :root {
        --nav-height: 56px;
    }
    
    body { font-size: 14px; }
    
    .main-container { padding: 12px; padding-top: calc(var(--nav-height) + 12px); }
    .page-header { margin-bottom: 16px; }
    .page-title { font-size: 20px; }
    .page-subtitle { font-size: 13px; }
    
    .kpi-grid { grid-template-columns: repeat(2, 1fr); gap: 10px; }
    .kpi-card { padding: 14px 12px; }
    .kpi-value { font-size: 22px; }
    .kpi-label { font-size: 11px; }
    
    .card { margin-bottom: 12px; }
    .card-header { padding: 12px 14px; }
    .card-title { font-size: 15px; }
    
    /* 按钮优化 */
    .btn { padding: 8px 14px; font-size: 13px; min-height: 36px; }
    .btn-sm { padding: 5px 10px; font-size: 12px; min-height: 30px; }
    .btn-group { flex-wrap: wrap; gap: 6px; }
    
    /* 表单优化 */
    .form-control, .form-input { 
        padding: 10px 12px; 
        font-size: 14px;
        min-height: 40px;
    }
    select.form-control { min-height: 40px; }
    
    /* 表格优化 */
    .data-table th, .data-table td { padding: 8px 10px; font-size: 12px; }
    .data-table th { font-size: 11px; }
    
    /* 徽章优化 */
    .badge { font-size: 10px; padding: 2px 6px; }
    
    /* 聊天界面优化 */
    #chatMessages { max-height: 50vh; }
    
    /* 分页优化 */
    .pagination { flex-wrap: wrap; gap: 4px; }
    .pagination button { min-width: 32px; height: 32px; font-size: 12px; }
}

/* 手机端（321px - 480px） */
@media (max-width: 480px) {
    :root {
        --nav-height: 52px;
    }
    
    body { font-size: 13px; }
    
    .main-container { padding: 10px; padding-top: calc(var(--nav-height) + 10px); }
    .page-title { font-size: 18px; }
    .page-subtitle { font-size: 12px; }
    
    .kpi-grid { grid-template-columns: 1fr 1fr; gap: 8px; }
    .kpi-card { padding: 12px 10px; border-radius: 8px; }
    .kpi-value { font-size: 20px; }
    .kpi-label { font-size: 10px; }
    
    .card { border-radius: 8px; margin-bottom: 10px; }
    .card-header { padding: 10px 12px; }
    .card-title { font-size: 14px; }
    
    /* 按钮全宽或自适应 */
    .btn { padding: 10px 12px; font-size: 13px; border-radius: 6px; }
    .btn-primary, .btn-success, .btn-warning, .btn-danger { width: auto; }
    
    /* 表单 */
    .form-control, .form-input { padding: 10px; font-size: 14px; border-radius: 6px; }
    
    /* 表格 - 更小字体 */
    .data-table th, .data-table td { padding: 6px 8px; font-size: 11px; }
    .table-container { margin: 0 -10px; padding: 0 10px; }
    
    .user-info { display: none; }
    .user-info.mobile-show { display: flex; }
    
    /* 弹窗/对话框 */
    .modal-content { width: 95%; margin: 10vh auto; max-height: 80vh; overflow-y: auto; }
    .modal-header { padding: 12px 16px; }
    .modal-body { padding: 16px; }
    .modal-footer { padding: 12px 16px; }
    
    /* 聊天界面 */
    #chatMessages { max-height: 45vh; padding: 10px; }
    #chatInput { font-size: 14px; padding: 10px 12px; }
    
    /* 隐藏非关键元素 */
    .hide-mobile { display: none !important; }
    
    /* 文字截断优化 */
    .text-truncate { max-width: 150px; }
}

/* 小屏手机（320px及以下） */
@media (max-width: 320px) {
    .kpi-grid { grid-template-columns: 1fr; }
    .btn { width: 100%; margin-bottom: 6px; }
    .btn-group { flex-direction: column; }
}

/* 折叠屏展开状态优化（800px-1024px） */
@media (min-width: 800px) and (max-width: 1024px) {
    .kpi-grid { grid-template-columns: repeat(3, 1fr); }
    .grid-2 { grid-template-columns: 1fr; }
    .filter-row { flex-wrap: wrap; }
    .filter-item { flex: 1 1 45%; min-width: 150px; }
}

/* 横屏手机优化 */
@media (max-height: 500px) and (orientation: landscape) {
    .modal-content { margin: 5vh auto; max-height: 90vh; }
    #chatMessages { max-height: 40vh; }
}

/* 触摸设备优化 */
@media (hover: none) and (pointer: coarse) {
    .btn, .data-table a, .clickable {
        min-height: 40px;
        min-width: 40px;
    }
}

/* 高DPI屏幕优化 */
@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
    .card { border-width: 0.5px; }
    .btn { border-width: 0.5px; }
}

/* 安全区域适配（刘海屏等） */
@supports (padding: max(0px)) {
    .main-container {
        padding-left: max(12px, env(safe-area-inset-left));
        padding-right: max(12px, env(safe-area-inset-right));
    }
}