/* 全局CSS变量 */
:root {
    --primary-color: #0088ff;
    --primary-hover: #0056b3;
    --secondary-color: #00c6ff;
    --text-color: #495057;
    --light-text: #6c757d;
    --border-color: #ced4da;
    --bg-gradient-start: #f5f7fa;
    --bg-gradient-end: #c3cfe2;
    --card-shadow: 0 15px 30px rgba(0,0,0,0.1);
    --input-shadow: 0 0 0 0.2rem rgba(0,123,255,.25);
    --btn-shadow: 0 5px 15px rgba(0,123,255,0.4);
    --danger-bg: #f8d7da;
    --danger-text: #721c24;
}

/* General Body Styles */
body {
    font-family: 'Arial', sans-serif;
    background: linear-gradient(135deg, var(--bg-gradient-start) 0%, var(--bg-gradient-end) 100%);
    color: var(--text-color);
    padding-top: 70px; /* Adjust if navbar height changes */
    min-height: 100vh;
}

/* Navbar Customization */
.navbar {
    box-shadow: var(--card-shadow);
    background: linear-gradient(45deg, var(--primary-color), var(--secondary-color)) !important;
}

.navbar-brand {
    font-weight: bold;
    text-shadow: 1px 1px 3px rgba(0,0,0,0.2);
}

.navbar-dark .navbar-nav .nav-link {
    color: rgba(255,255,255,0.85);
    transition: all 0.3s ease;
}

.navbar-dark .navbar-nav .nav-link:hover {
    color: #fff;
    transform: translateY(-2px);
}

.navbar-dark .navbar-nav .nav-link.active {
    color: #fff;
    font-weight: bold;
}

/* 登出按钮样式 */
.nav-logout {
    margin-left: auto;
}

.nav-logout .nav-link {
    color: rgba(255,255,255,0.9) !important;
    display: flex;
    align-items: center;
}

.nav-logout .nav-link i {
    margin-right: 5px;
}

.nav-logout .nav-link:hover {
    color: #fff !important;
}

/* Container and Card Styles */
.container {
    max-width: 1200px; /* Max width for larger screens */
    padding: 0 15px;
}

.card {
    border: none;
    box-shadow: var(--card-shadow);
    margin-bottom: 1.5rem;
    border-radius: 12px;
    overflow: hidden;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 20px 40px rgba(0,0,0,0.15);
}

.card-header {
    background: linear-gradient(45deg, var(--primary-color), var(--secondary-color));
    color: white;
    font-weight: bold;
    border-bottom: none;
    padding: 1rem 1.25rem;
}

/* Table Styles */
.table {
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 5px 15px rgba(0,0,0,0.05);
    width: 200;
    margin-bottom: 0;
}

.table th {
    background: linear-gradient(45deg, var(--primary-color), var(--secondary-color));
    color: white;
    border: none;
    padding: 12px 10px;
    white-space: nowrap;
}

.table-hover tbody tr:hover {
    background-color: rgba(0,136,255,0.05);
    transform: scale(1.01);
    transition: all 0.2s;
}

.table td {
    padding: 12px 10px;
    vertical-align: middle;
}

/* 欠款列表特定样式 */
.dashboard-card .table-responsive {
    width: 100%;
    overflow-x: auto;
}

.dashboard-card .card-body.p-0 .table {
    border-radius: 0;
    border-bottom-left-radius: 12px;
    border-bottom-right-radius: 12px;
}

/* 操作按钮列样式 */
.table td:last-child {
    text-align: center;
    white-space: nowrap;
}

/* 操作按钮间距调整 */
.table td .btn {
    margin: 0 2px;
    padding: 6px 10px;
}

/* Button Styles */
.btn {
    border-radius: 8px;
    font-weight: 600;
    letter-spacing: 0.5px;
    padding: 8px 16px;
    transition: all 0.3s;
    border: none;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0,0,0,0.15);
}

.btn-primary {
    background: linear-gradient(45deg, var(--primary-color), var(--secondary-color));
    border: none;
}

.btn-primary:hover {
    background: linear-gradient(45deg, var(--primary-hover), var(--primary-color));
}

.btn-success {
    background: linear-gradient(45deg, #28a745, #5cb85c);
    border: none;
}

.btn-success:hover {
    background: linear-gradient(45deg, #1e7e34, #28a745);
}

.btn-danger {
    background: linear-gradient(45deg, #dc3545, #f55a4e);
    border: none;
}

.btn-danger:hover {
    background: linear-gradient(45deg, #c82333, #dc3545);
}

.btn-warning {
    color: #fff; /* Ensure text is readable on warning */
    background: linear-gradient(45deg, #ffc107, #ffdb58);
    border: none;
}

.btn-warning:hover {
    background: linear-gradient(45deg, #e0a800, #ffc107);
}

.btn-info {
    background: linear-gradient(45deg, #17a2b8, #5bc0de);
    border: none;
}

.btn-info:hover {
    background: linear-gradient(45deg, #117a8b, #17a2b8);
}

.btn-secondary {
    background: linear-gradient(45deg, #6c757d, #868e96);
    border: none;
}

.btn-secondary:hover {
    background: linear-gradient(45deg, #5a6268, #6c757d);
}

/* Form Control Styles */
.form-control, .form-select {
    height: 48px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    transition: all 0.3s;
    font-size: 1rem;
    padding-left: 15px;
}

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

.form-control::placeholder {
    color: #adb5bd;
    opacity: 0.8;
}

.form-label {
    font-weight: 600;
    color: var(--text-color);
    margin-bottom: 0.5rem;
}

/* 表单组样式 */
.form-group {
    margin-bottom: 1.5rem;
    position: relative;
}

/* Alert Messages */
.alert {
    margin-top: 1rem;
    border-radius: 8px;
    padding: 1rem;
    border: none;
    box-shadow: 0 5px 15px rgba(0,0,0,0.05);
    animation: fadeIn 0.5s;
}

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

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

/* Footer Styles */
footer {
    padding: 1.5rem 0;
    background: linear-gradient(45deg, var(--primary-color), var(--secondary-color));
    color: white;
    border-top: none;
    font-size: 0.9em;
    margin-top: 3rem;
    box-shadow: 0 -5px 15px rgba(0,0,0,0.1);
}

footer .text-center {
    text-shadow: 1px 1px 3px rgba(0,0,0,0.2);
}

/* Chart Canvas */
#remainingAmountChart, #comparisonChart, #borrowerPieChart {
    max-height: 400px;
    margin-bottom: 2rem;
}

/* Responsive adjustments */
@media (max-width: 991.98px) {
    .navbar-nav {
        text-align: center;
    }
    
    .nav-logout {
        margin-left: 0;
        margin-top: 10px;
    }
    
    .container {
        padding-left: 15px;
        padding-right: 15px;
    }
    
    h1 {
        font-size: 1.75rem;
    }
    
    .card-header {
        padding: 0.75rem 1rem;
    }
    
    .btn {
        padding: 6px 12px;
    }
}

@media (max-width: 767.98px) {
    body {
        padding-top: 60px;
    }
    
    .navbar-brand {
        font-size: 1.2rem;
    }
    
    .card {
        margin-bottom: 1rem;
    }
    
    .table th, .table td {
        padding: 8px 10px;
    }
    
    .form-control, .form-select {
        height: 44px;
    }
}

/* Loan Status Badges */
.badge.bg-success {
    background-color: #28a745 !important;
}
.badge.bg-warning {
    background-color: #ffc107 !important;
    color: #212529 !important; /* Darker text for yellow badge */
}
.badge.bg-danger {
    background-color: #dc3545 !important;
}
.badge.bg-info {
    background-color: #17a2b8 !important;
}
.badge.bg-secondary {
    background-color: #6c757d !important;
}

/* Helper for currency formatting if needed directly in HTML (though PHP is better) */
.currency::before {
    content: "¥";
}

/* Utility classes */
.text-small {
    font-size: 0.85em;
}

.mb-custom {
    margin-bottom: 2rem !important;
}

.action-buttons a {
    margin-right: 5px;
    margin-bottom: 5px; /* For stacking on small screens */
}

.action-buttons a:last-child {
    margin-right: 0;
}

/* View Loan Page Specifics */
.loan-details-card .list-group-item strong {
    min-width: 150px; /* Align labels */
    display: inline-block;
}

.repayment-history-card .table {
    margin-bottom: 0; /* Remove bottom margin if it's the last element in card body */
}

/* 首页图表卡片高度统一 */
#remainingAmountChart,
#comparisonChart,
#borrowerPieChart {
    min-height: 320px;
    max-height: 320px;
}

.card.flex-fill {
    display: flex;
    flex-direction: column;
    height: 100%;
}

.card-body {
    flex: 1 1 auto;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* 首页图表区间距优化 */
.row.mb-4.g-3.align-items-stretch > [class^='col-'] {
    margin-bottom: 0 !important;
}

@media (max-width: 991.98px) {
    /* 平板及以下：2列 */
    .row.mb-4.g-3.align-items-stretch > .col-lg-4 {
        flex: 0 0 50%;
        max-width: 50%;
    }
    .row.mb-4.g-3.align-items-stretch > .col-lg-4.col-md-12 {
        flex: 0 0 100%;
        max-width: 100%;
    }
}
@media (max-width: 767.98px) {
    /* 手机：1列竖排 */
    .row.mb-4.g-3.align-items-stretch > [class^='col-'] {
        flex: 0 0 100%;
        max-width: 100%;
        margin-bottom: 1rem !important;
    }
    .card.flex-fill {
        margin-bottom: 0.5rem;
    }
    .card-body {
        padding: 0.5rem;
    }
}

/* 移动端卡片式列表样式 */
.loan-cards { display: none; }
@media (max-width: 767.98px) {
    .table-responsive { display: none; }
    .loan-cards { display: block; }
    .loan-card .card-body { padding: 1rem; }
    .loan-card strong { font-size: 1.1rem; }
    .loan-card .badge { font-size: 1em; }
    .loan-card .btn { min-width: 60px; font-size: 1em; }
    .loan-card .mt-2 { display: flex; flex-wrap: wrap; gap: 0.5rem 0.5rem; }
    .loan-card div { word-break: break-all; }
}