/* 
* Fee Management System - Main Stylesheet
* Version: 1.0
* Author: System Developer
*/

:root {
    /* Primary Colors */
    --primary-color: #4e73df;
    --primary-dark: #2e59d9;
    --primary-light: #e3ebf7;
    
    /* Secondary Colors */
    --secondary-color: #1cc88a;
    --secondary-dark: #17a673;
    --secondary-light: #d4edda;
    
    /* Accent Colors */
    --accent-color: #36b9cc;
    --accent-dark: #2c9faf;
    --accent-light: #d1ecf1;
    
    /* Neutral Colors */
    --dark-color: #2e3a59;
    --gray-dark: #5a5c69;
    --gray: #858796;
    --gray-light: #b7b9cc;
    --gray-lighter: #dddfeb;
    --light-color: #f8f9fc;
    --white: #ffffff;
    
    /* Status Colors */
    --success-color: #1cc88a;
    --warning-color: #f6c23e;
    --danger-color: #e74a3b;
    --info-color: #36b9cc;
    
    /* Shadows */
    --shadow-sm: 0 0.125rem 0.25rem rgba(0, 0, 0, 0.075);
    --shadow: 0 0.15rem 1.75rem 0 rgba(58, 59, 69, 0.15);
    --shadow-lg: 0 1rem 3rem rgba(0, 0, 0, 0.175);
    
    /* Borders */
    --border-radius: 0.35rem;
    --border-radius-lg: 0.5rem;
    --border-radius-xl: 1rem;
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 3rem;
    
    /* Typography */
    --font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size: 1rem;
    --font-size-lg: 1.25rem;
    --font-size-xl: 1.5rem;
    --font-size-xxl: 2rem;
}

/* Reset & Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size);
    line-height: 1.6;
    color: var(--dark-color);
    background-color: var(--light-color);
    min-height: 100vh;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.2;
    margin-bottom: var(--spacing);
    color: var(--dark-color);
}

h1 { font-size: var(--font-size-xxl); }
h2 { font-size: var(--font-size-xl); }
h3 { font-size: var(--font-size-lg); }
h4 { font-size: var(--font-size); }
h5 { font-size: var(--font-size-sm); }
h6 { font-size: var(--font-size-xs); }

p {
    margin-bottom: var(--spacing);
}

a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color 0.3s ease;
}

a:hover {
    color: var(--primary-dark);
    text-decoration: underline;
}

/* Layout */
.container {
    width: 100%;
    padding-right: var(--spacing);
    padding-left: var(--spacing);
    margin-right: auto;
    margin-left: auto;
}

@media (min-width: 576px) {
    .container { max-width: 540px; }
}

@media (min-width: 768px) {
    .container { max-width: 720px; }
}

@media (min-width: 992px) {
    .container { max-width: 960px; }
}

@media (min-width: 1200px) {
    .container { max-width: 1140px; }
}

/* Cards */
.card {
    background-color: var(--white);
    border: 1px solid var(--gray-lighter);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-sm);
    margin-bottom: var(--spacing);
    transition: all 0.3s ease;
}

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

.card-header {
    padding: var(--spacing) var(--spacing-lg);
    background-color: var(--light-color);
    border-bottom: 1px solid var(--gray-lighter);
    border-radius: var(--border-radius-lg) var(--border-radius-lg) 0 0;
}

.card-body {
    padding: var(--spacing-lg);
}

.card-footer {
    padding: var(--spacing) var(--spacing-lg);
    background-color: var(--light-color);
    border-top: 1px solid var(--gray-lighter);
    border-radius: 0 0 var(--border-radius-lg) var(--border-radius-lg);
}

/* Buttons */
.btn {
    display: inline-block;
    font-weight: 400;
    text-align: center;
    white-space: nowrap;
    vertical-align: middle;
    user-select: none;
    border: 1px solid transparent;
    padding: 0.375rem 0.75rem;
    font-size: var(--font-size);
    line-height: 1.5;
    border-radius: var(--border-radius);
    transition: all 0.15s ease-in-out;
    cursor: pointer;
}

.btn:hover {
    text-decoration: none;
}

.btn:focus {
    outline: 0;
    box-shadow: 0 0 0 0.2rem rgba(78, 115, 223, 0.25);
}

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

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

.btn-secondary {
    color: var(--white);
    background-color: var(--gray);
    border-color: var(--gray);
}

.btn-secondary:hover {
    background-color: var(--gray-dark);
    border-color: var(--gray-dark);
}

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

.btn-success:hover {
    background-color: var(--secondary-dark);
    border-color: var(--secondary-dark);
}

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

.btn-danger:hover {
    background-color: #c82333;
    border-color: #bd2130;
}

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

.btn-warning:hover {
    background-color: #e0a800;
    border-color: #d39e00;
}

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

.btn-info:hover {
    background-color: var(--accent-dark);
    border-color: var(--accent-dark);
}

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

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

.btn-lg {
    padding: 0.5rem 1rem;
    font-size: var(--font-size-lg);
    border-radius: var(--border-radius-lg);
}

.btn-sm {
    padding: 0.25rem 0.5rem;
    font-size: var(--font-size-sm);
    border-radius: var(--border-radius);
}

/* Forms */
.form-group {
    margin-bottom: var(--spacing);
}

.form-label {
    display: inline-block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--gray-dark);
}

.form-control {
    display: block;
    width: 100%;
    padding: 0.375rem 0.75rem;
    font-size: var(--font-size);
    line-height: 1.5;
    color: var(--dark-color);
    background-color: var(--white);
    background-clip: padding-box;
    border: 1px solid var(--gray-lighter);
    border-radius: var(--border-radius);
    transition: border-color 0.15s ease-in-out, box-shadow 0.15s ease-in-out;
}

.form-control:focus {
    color: var(--dark-color);
    background-color: var(--white);
    border-color: var(--primary-light);
    outline: 0;
    box-shadow: 0 0 0 0.2rem rgba(78, 115, 223, 0.25);
}

.form-control.is-invalid {
    border-color: var(--danger-color);
    padding-right: calc(1.5em + 0.75rem);
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='none' stroke='%23e74a3b' viewBox='0 0 12 12'%3e%3ccircle cx='6' cy='6' r='4.5'/%3e%3cpath stroke-linejoin='round' d='M5.8 3.6h.4L6 6.5z'/%3e%3ccircle cx='6' cy='8.2' r='.6' fill='%23e74a3b' stroke='none'/%3e%3c/svg%3e");
    background-repeat: no-repeat;
    background-position: right calc(0.375em + 0.1875rem) center;
    background-size: calc(0.75em + 0.375rem) calc(0.75em + 0.375rem);
}

.form-text {
    display: block;
    margin-top: 0.25rem;
    font-size: var(--font-size-sm);
    color: var(--gray);
}

/* Tables */
.table {
    width: 100%;
    margin-bottom: var(--spacing);
    color: var(--dark-color);
    background-color: var(--white);
    border-collapse: collapse;
}

.table th,
.table td {
    padding: 0.75rem;
    vertical-align: top;
    border-top: 1px solid var(--gray-lighter);
}

.table thead th {
    vertical-align: bottom;
    border-bottom: 2px solid var(--gray-lighter);
    background-color: var(--light-color);
    font-weight: 600;
}

.table tbody + tbody {
    border-top: 2px solid var(--gray-lighter);
}

.table-striped tbody tr:nth-of-type(odd) {
    background-color: rgba(0, 0, 0, 0.02);
}

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

/* Alerts */
.alert {
    position: relative;
    padding: 0.75rem 1.25rem;
    margin-bottom: var(--spacing);
    border: 1px solid transparent;
    border-radius: var(--border-radius);
}

.alert-success {
    color: #155724;
    background-color: var(--secondary-light);
    border-color: #c3e6cb;
}

.alert-danger {
    color: #721c24;
    background-color: #f8d7da;
    border-color: #f5c6cb;
}

.alert-warning {
    color: #856404;
    background-color: #fff3cd;
    border-color: #ffeeba;
}

.alert-info {
    color: #0c5460;
    background-color: var(--accent-light);
    border-color: #bee5eb;
}

/* Badges */
.badge {
    display: inline-block;
    padding: 0.25em 0.4em;
    font-size: 75%;
    font-weight: 600;
    line-height: 1;
    text-align: center;
    white-space: nowrap;
    vertical-align: baseline;
    border-radius: var(--border-radius);
}

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

.badge-secondary {
    color: var(--white);
    background-color: var(--gray);
}

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

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

.badge-warning {
    color: var(--dark-color);
    background-color: var(--warning-color);
}

.badge-info {
    color: var(--white);
    background-color: var(--info-color);
}

/* Navigation */
.navbar {
    position: relative;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    padding: 0.5rem 1rem;
    background-color: var(--white);
    box-shadow: var(--shadow);
    z-index: 1030;
}

.navbar-brand {
    display: inline-block;
    padding-top: 0.3125rem;
    padding-bottom: 0.3125rem;
    margin-right: 1rem;
    font-size: var(--font-size-lg);
    line-height: inherit;
    white-space: nowrap;
    color: var(--primary-color);
    font-weight: 700;
}

.navbar-nav {
    display: flex;
    flex-direction: column;
    padding-left: 0;
    margin-bottom: 0;
    list-style: none;
}

.navbar-nav .nav-link {
    padding-right: 0;
    padding-left: 0;
}

.nav-link {
    display: block;
    padding: 0.5rem 1rem;
    color: var(--gray-dark);
}

.nav-link:hover,
.nav-link.active {
    color: var(--primary-color);
    text-decoration: none;
}

/* Sidebar */
.sidebar {
    position: fixed;
    top: 0;
    bottom: 0;
    left: 0;
    z-index: 100;
    padding: 48px 0 0;
    box-shadow: var(--shadow);
    background-color: var(--white);
    width: 250px;
}

.sidebar-sticky {
    position: relative;
    top: 0;
    height: calc(100vh - 48px);
    padding-top: 0.5rem;
    overflow-x: hidden;
    overflow-y: auto;
}

.sidebar .nav-link {
    font-weight: 500;
    color: var(--gray-dark);
    padding: 0.75rem 1rem;
    border-left: 3px solid transparent;
    transition: all 0.3s ease;
}

.sidebar .nav-link:hover {
    color: var(--primary-color);
    background-color: var(--light-color);
    border-left-color: var(--primary-color);
}

.sidebar .nav-link.active {
    color: var(--primary-color);
    background-color: var(--primary-light);
    border-left-color: var(--primary-color);
}

/* Main Content */
.main-content {
    margin-left: 250px;
    padding: 20px;
    min-height: 100vh;
    background-color: var(--light-color);
}

/* Dashboard Stats */
.stat-card {
    background: var(--white);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing);
    margin-bottom: var(--spacing);
    box-shadow: var(--shadow-sm);
    transition: all 0.3s ease;
}

.stat-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow);
}

.stat-card .stat-number {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary-color);
}

.stat-card .stat-label {
    font-size: 0.875rem;
    color: var(--gray);
    text-transform: uppercase;
    letter-spacing: 1px;
}

/* Progress Bars */
.progress {
    display: flex;
    height: 1rem;
    overflow: hidden;
    font-size: 0.75rem;
    background-color: var(--gray-lighter);
    border-radius: var(--border-radius);
    margin-bottom: var(--spacing);
}

.progress-bar {
    display: flex;
    flex-direction: column;
    justify-content: center;
    color: var(--white);
    text-align: center;
    white-space: nowrap;
    background-color: var(--primary-color);
    transition: width 0.6s ease;
}

.progress-bar-striped {
    background-image: linear-gradient(45deg, rgba(255, 255, 255, 0.15) 25%, transparent 25%, transparent 50%, rgba(255, 255, 255, 0.15) 50%, rgba(255, 255, 255, 0.15) 75%, transparent 75%, transparent);
    background-size: 1rem 1rem;
}

/* Utility Classes */
.text-primary { color: var(--primary-color) !important; }
.text-secondary { color: var(--gray) !important; }
.text-success { color: var(--success-color) !important; }
.text-danger { color: var(--danger-color) !important; }
.text-warning { color: var(--warning-color) !important; }
.text-info { color: var(--info-color) !important; }
.text-dark { color: var(--dark-color) !important; }
.text-light { color: var(--light-color) !important; }

.bg-primary { background-color: var(--primary-color) !important; }
.bg-secondary { background-color: var(--gray) !important; }
.bg-success { background-color: var(--success-color) !important; }
.bg-danger { background-color: var(--danger-color) !important; }
.bg-warning { background-color: var(--warning-color) !important; }
.bg-info { background-color: var(--info-color) !important; }
.bg-dark { background-color: var(--dark-color) !important; }
.bg-light { background-color: var(--light-color) !important; }

.mt-0 { margin-top: 0 !important; }
.mt-1 { margin-top: var(--spacing-xs) !important; }
.mt-2 { margin-top: var(--spacing-sm) !important; }
.mt-3 { margin-top: var(--spacing) !important; }
.mt-4 { margin-top: var(--spacing-lg) !important; }
.mt-5 { margin-top: var(--spacing-xl) !important; }

.mb-0 { margin-bottom: 0 !important; }
.mb-1 { margin-bottom: var(--spacing-xs) !important; }
.mb-2 { margin-bottom: var(--spacing-sm) !important; }
.mb-3 { margin-bottom: var(--spacing) !important; }
.mb-4 { margin-bottom: var(--spacing-lg) !important; }
.mb-5 { margin-bottom: var(--spacing-xl) !important; }

.pt-0 { padding-top: 0 !important; }
.pt-1 { padding-top: var(--spacing-xs) !important; }
.pt-2 { padding-top: var(--spacing-sm) !important; }
.pt-3 { padding-top: var(--spacing) !important; }
.pt-4 { padding-top: var(--spacing-lg) !important; }
.pt-5 { padding-top: var(--spacing-xl) !important; }

.pb-0 { padding-bottom: 0 !important; }
.pb-1 { padding-bottom: var(--spacing-xs) !important; }
.pb-2 { padding-bottom: var(--spacing-sm) !important; }
.pb-3 { padding-bottom: var(--spacing) !important; }
.pb-4 { padding-bottom: var(--spacing-lg) !important; }
.pb-5 { padding-bottom: var(--spacing-xl) !important; }

.text-center { text-align: center !important; }
.text-right { text-align: right !important; }
.text-left { text-align: left !important; }

.d-none { display: none !important; }
.d-block { display: block !important; }
.d-inline { display: inline !important; }
.d-inline-block { display: inline-block !important; }
.d-flex { display: flex !important; }

.flex-column { flex-direction: column !important; }
.justify-content-center { justify-content: center !important; }
.justify-content-between { justify-content: space-between !important; }
.align-items-center { align-items: center !important; }

.w-100 { width: 100% !important; }
.h-100 { height: 100% !important; }

.rounded { border-radius: var(--border-radius) !important; }
.rounded-circle { border-radius: 50% !important; }

.shadow { box-shadow: var(--shadow) !important; }
.shadow-sm { box-shadow: var(--shadow-sm) !important; }
.shadow-lg { box-shadow: var(--shadow-lg) !important; }

/* Animations */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes slideInDown {
    from {
        transform: translateY(-100%);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

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

.fade-in {
    animation: fadeIn 0.5s ease-in-out;
}

.slide-in-down {
    animation: slideInDown 0.5s ease-in-out;
}

.slide-in-up {
    animation: slideInUp 0.5s ease-in-out;
}

/* Print Styles */
@media print {
    .no-print {
        display: none !important;
    }
    
    .card {
        box-shadow: none;
        border: 1px solid #dee2e6;
    }
    
    body {
        background-color: white !important;
    }
}

/* Responsive Adjustments */
@media (max-width: 768px) {
    .sidebar {
        position: static;
        width: 100%;
        height: auto;
        padding: 0;
    }
    
    .main-content {
        margin-left: 0;
        padding: 15px;
    }
    
    .navbar-nav {
        flex-direction: row;
    }
    
    .stat-card {
        margin-bottom: var(--spacing-sm);
    }
    
    .table-responsive {
        display: block;
        width: 100%;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
    }
}

/* Dark Mode Support */
@media (prefers-color-scheme: dark) {
    :root {
        --dark-color: #f8f9fa;
        --light-color: #343a40;
        --white: #212529;
        --gray-lighter: #495057;
        --gray: #6c757d;
    }
    
    body {
        background-color: #212529;
        color: #f8f9fa;
    }
    
    .card {
        background-color: #343a40;
        border-color: #495057;
    }
    
    .form-control {
        background-color: #495057;
        border-color: #6c757d;
        color: #f8f9fa;
    }
    
    .table {
        color: #f8f9fa;
        background-color: #343a40;
    }
    
    .table th,
    .table td {
        border-color: #495057;
    }
}