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

:root {
    --primary-color: #4f46e5;
    --primary-hover: #4338ca;
    --bg-color: #f8fafc;
    --card-bg: #ffffff;
    --sidebar-bg: #1e293b;
    --sidebar-text: #94a3b8;
    --sidebar-active: #4f46e5;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --border-color: #e2e8f0;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --danger-color: #ef4444;
    --info-color: #3b82f6;
}

body {
    font-family: "Inter", "Microsoft YaHei", "Segoe UI", Arial, sans-serif;
    padding-top: 60px;
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.6;
}

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

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

.wrapper {
    display: flex;
    flex-direction: column;
    height: 100vh;
}

.navbar {
    background: var(--card-bg);
    border-bottom: 1px solid var(--border-color);
    box-shadow: 0 1px 3px rgba(0,0,0,0.05);
    padding: 0 20px;
    height: 60px;
}

.navbar-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 600;
    font-size: 18px;
    color: var(--text-primary);
    height: 60px;
}

.navbar-brand .logo-icon {
    width: 36px;
    height: 36px;
    background: linear-gradient(135deg, var(--primary-color), #818cf8);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 20px;
}

.navbar-nav > li > a {
    color: var(--text-secondary);
    padding: 20px 15px;
    transition: color 0.2s;
}

.navbar-nav > li > a:hover,
.navbar-nav > li.active > a {
    color: var(--primary-color);
    background: transparent;
}

.navbar-toggle {
    margin-top: 13px;
}

.sidebar {
    position: fixed;
    top: 60px;
    left: 0;
    width: 240px;
    height: calc(100vh - 60px);
    background: var(--sidebar-bg);
    overflow-y: auto;
    z-index: 1000;
    transition: width 0.3s;
}

.sidebar-nav {
    padding: 15px 0;
}

.sidebar-nav li {
    margin: 2px 10px;
}

.sidebar-nav li a {
    color: var(--sidebar-text);
    padding: 12px 16px;
    display: flex;
    align-items: center;
    gap: 12px;
    border-radius: 8px;
    transition: all 0.2s;
    font-size: 14px;
}

.sidebar-nav li a i {
    font-size: 18px;
    width: 24px;
    text-align: center;
}

.sidebar-nav li a:hover {
    background: rgba(255,255,255,0.08);
    color: #fff;
    text-decoration: none;
}

.sidebar-nav li.active a {
    background: var(--sidebar-active);
    color: #fff;
}

.main-content {
    margin-left: 240px;
    padding: 24px;
    min-height: calc(100vh - 60px);
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
    animation: fadeIn 0.3s ease;
}

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

.stat-card {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 20px;
    margin-bottom: 16px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.05);
    border: 1px solid var(--border-color);
    transition: transform 0.2s, box-shadow 0.2s;
}

.stat-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}

.stat-card .stat-icon {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    margin-right: 16px;
}

.stat-card .stat-info {
    display: flex;
    flex-direction: column;
}

.stat-card .stat-number {
    font-size: 28px;
    font-weight: 700;
    line-height: 1.2;
    color: var(--text-primary);
}

.stat-card .stat-label {
    font-size: 13px;
    color: var(--text-secondary);
    margin-top: 4px;
}

.stat-primary .stat-icon { background: rgba(79,70,229,0.1); color: var(--primary-color); }
.stat-success .stat-icon { background: rgba(16,185,129,0.1); color: var(--success-color); }
.stat-warning .stat-icon { background: rgba(245,158,11,0.1); color: var(--warning-color); }
.stat-info .stat-icon { background: rgba(59,130,246,0.1); color: var(--info-color); }
.stat-danger .stat-icon { background: rgba(239,68,68,0.1); color: var(--danger-color); }
.stat-money .stat-icon { background: rgba(16,185,129,0.1); color: var(--success-color); }

.panel {
    background: var(--card-bg);
    border-radius: 12px;
    border: 1px solid var(--border-color);
    box-shadow: 0 1px 3px rgba(0,0,0,0.05);
    margin-bottom: 20px;
}

.panel-heading {
    padding: 16px 20px;
    border-bottom: 1px solid var(--border-color);
    background: transparent;
    border-radius: 12px 12px 0 0;
}

.panel-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 8px;
}

.panel-title i {
    color: var(--primary-color);
}

.panel-body {
    padding: 20px;
}

.table {
    margin-bottom: 0;
    color: var(--text-primary);
}

.table thead th {
    background: var(--bg-color);
    border-bottom: 2px solid var(--border-color);
    font-weight: 600;
    font-size: 13px;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    padding: 12px 16px;
}

.table tbody td {
    padding: 14px 16px;
    vertical-align: middle;
    border-bottom: 1px solid var(--border-color);
}

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

.table-striped tbody tr:nth-of-type(odd) {
    background: #fafbfc;
}

.btn {
    border-radius: 8px;
    padding: 8px 16px;
    font-size: 14px;
    font-weight: 500;
    transition: all 0.2s;
    border: none;
}

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

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

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

.btn-success:hover {
    background: #059669;
}

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

.btn-warning:hover {
    background: #d97706;
}

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

.btn-danger:hover {
    background: #dc2626;
}

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

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

.btn-xs {
    padding: 4px 10px;
    font-size: 12px;
}

.room-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.room-item {
    width: 90px;
    height: 90px;
    border-radius: 10px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.2s;
    border: 2px solid transparent;
}

.room-item:hover {
    transform: scale(1.05);
}

.room-item.selected {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(79,70,229,0.2);
}

.room-item.available {
    background: rgba(16,185,129,0.1);
    color: var(--success-color);
}

.room-item.occupied {
    background: rgba(239,68,68,0.1);
    color: var(--danger-color);
}

.room-item.cleaning {
    background: rgba(245,158,11,0.1);
    color: var(--warning-color);
}

.room-item.maintenance {
    background: rgba(59,130,246,0.1);
    color: var(--info-color);
}

.room-item .room-no {
    font-size: 18px;
    font-weight: 700;
}

.room-item .room-status {
    font-size: 11px;
    margin-top: 2px;
}

.room-select-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.room-select-item {
    width: 80px;
    height: 80px;
    border-radius: 8px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    border: 2px solid var(--border-color);
    background: rgba(16,185,129,0.1);
    color: var(--success-color);
    transition: all 0.2s;
}

.room-select-item:hover {
    border-color: var(--primary-color);
}

.room-select-item.selected {
    border-color: var(--primary-color);
    background: var(--primary-color);
    color: #fff;
}

.room-select-item .room-no {
    font-size: 16px;
    font-weight: 700;
}

.room-select-item .room-price {
    font-size: 11px;
    opacity: 0.8;
}

.current-guest-item {
    padding: 12px 0;
    border-bottom: 1px solid var(--border-color);
}

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

.current-guest-item .guest-name {
    font-weight: 600;
    color: var(--text-primary);
}

.current-guest-item .guest-info {
    font-size: 12px;
    color: var(--text-secondary);
}

.current-guest-item .guest-actions {
    margin-top: 8px;
}

.badge-available { background: var(--success-color); }
.badge-occupied { background: var(--danger-color); }
.badge-cleaning { background: var(--warning-color); }
.badge-maintenance { background: var(--info-color); }

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

.mt-20 { margin-top: 20px; }
.mb20 { margin-bottom: 20px; }

.form-group {
    margin-bottom: 16px;
}

.form-group label {
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: 6px;
    font-size: 14px;
}

.form-control {
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 10px 14px;
    font-size: 14px;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.form-control:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(79,70,229,0.1);
    outline: none;
}

select.form-control {
    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 12px center;
    padding-right: 36px;
}

.modal-content {
    border-radius: 12px;
    border: none;
    box-shadow: 0 20px 60px rgba(0,0,0,0.2);
}

.modal-header {
    padding: 20px 24px;
    border-bottom: 1px solid var(--border-color);
}

.modal-title {
    font-weight: 600;
    font-size: 18px;
}

.modal-body {
    padding: 24px;
}

.modal-footer {
    padding: 16px 24px;
    border-top: 1px solid var(--border-color);
}

.modal-header .close {
    opacity: 0.5;
}

.modal-header .close:hover {
    opacity: 1;
}

#otherFeesList .fee-item {
    display: flex;
    gap: 10px;
    margin-bottom: 10px;
    align-items: center;
}

#otherFeesList .fee-item input {
    flex: 1;
}

select option {
    padding: 8px;
}

.input-group {
    border-radius: 8px;
    overflow: hidden;
}

.input-group-addon {
    background: var(--bg-color);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
}

@media (max-width: 768px) {
    .sidebar {
        width: 100%;
        height: auto;
        position: relative;
        top: 0;
        left: 0;
        border-right: none;
        border-bottom: 2px solid var(--sidebar-bg);
    }

    .main-content {
        margin-left: 0;
        padding: 16px;
    }

    .stat-card {
        padding: 16px;
    }

    .stat-card .stat-icon {
        width: 40px;
        height: 40px;
        font-size: 20px;
    }

    .stat-card .stat-number {
        font-size: 24px;
    }

    .room-item {
        width: 70px;
        height: 70px;
    }

    .panel-body {
        padding: 16px;
    }

    .table-responsive {
        border: none;
    }
}

::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

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

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