/* style.css - Complete Billing System Styles */

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

:root {
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --danger-color: #ef4444;
    --info-color: #3b82f6;
    --secondary-color: #6b7280;
    --light-bg: #f9fafb;
    --border-color: #e5e7eb;
    --text-primary: #111827;
    --text-secondary: #6b7280;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    font-size: 16px;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--light-bg);
}

/* Navigation Bar */
.navbar {
    background: white;
    box-shadow: var(--shadow-md);
    position: sticky;
    top: 0;
    z-index: 100;
    border-bottom: 3px solid var(--primary-color);
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-brand h1 {
    font-size: 24px;
    color: var(--primary-color);
    padding: 15px 0;
}

.nav-menu {
    list-style: none;
    display: flex;
    align-items: center;
    gap: 10px;
}

.nav-link {
    text-decoration: none;
    color: var(--text-primary);
    padding: 10px 20px;
    border-radius: 6px;
    transition: all 0.3s;
    font-weight: 500;
}

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

.nav-user {
    display: flex;
    align-items: center;
    gap: 15px;
    margin-left: 20px;
    padding-left: 20px;
    border-left: 2px solid var(--border-color);
}

.nav-user span {
    font-weight: 500;
    color: var(--text-secondary);
}

/* Container */
.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 30px 20px;
}

/* Page Header */
.page-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
}

.page-header h2 {
    font-size: 32px;
    color: var(--text-primary);
}

.page-header p {
    color: var(--text-secondary);
    margin-top: 5px;
}

/* Cards */
.card {
    background: white;
    border-radius: 8px;
    box-shadow: var(--shadow-sm);
    margin-bottom: 25px;
    overflow: hidden;
}

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

.card-header h3 {
    font-size: 20px;
    color: var(--text-primary);
}

.card-body {
    padding: 25px;
}

/* Stats Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.stat-card {
    background: white;
    padding: 25px;
    border-radius: 8px;
    box-shadow: var(--shadow-sm);
    display: flex;
    align-items: center;
    gap: 20px;
    border-left: 4px solid;
    transition: transform 0.3s, box-shadow 0.3s;
}

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

.stat-card.stat-primary { border-left-color: var(--primary-color); }
.stat-card.stat-success { border-left-color: var(--success-color); }
.stat-card.stat-warning { border-left-color: var(--warning-color); }
.stat-card.stat-danger { border-left-color: var(--danger-color); }
.stat-card.stat-info { border-left-color: var(--info-color); }

.stat-icon {
    font-size: 48px;
    opacity: 0.8;
}

.stat-content h3 {
    font-size: 14px;
    color: var(--text-secondary);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.stat-value {
    font-size: 28px;
    font-weight: bold;
    color: var(--text-primary);
    margin-top: 5px;
}

/* Status Summary */
.status-summary {
    display: flex;
    justify-content: center;
    gap: 40px;
    margin-bottom: 30px;
    padding: 20px;
    background: white;
    border-radius: 8px;
    box-shadow: var(--shadow-sm);
}

.status-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
}

.status-badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 60px;
    height: 60px;
    border-radius: 50%;
    font-size: 24px;
    font-weight: bold;
    color: white;
}

.status-badge.status-paid { background-color: var(--success-color); }
.status-badge.status-pending { background-color: var(--warning-color); }
.status-badge.status-partial { background-color: var(--info-color); }

/* Forms */
.form-group {
    margin-bottom: 20px;
}

.form-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: var(--text-primary);
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 16px;
    transition: border-color 0.3s;
}

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

.form-control {
    width: 100%;
    padding: 8px 10px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-size: 14px;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 10px 20px;
    font-size: 16px;
    font-weight: 500;
    text-decoration: none;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.3s;
    text-align: center;
}

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

.btn-primary:hover {
    background-color: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

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

.btn-secondary:hover {
    background-color: #4b5563;
}

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

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

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

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

.btn-logout {
    background-color: var(--danger-color);
    color: white;
    padding: 8px 16px;
    font-size: 14px;
}

.btn-sm {
    padding: 6px 12px;
    font-size: 14px;
}

.btn-block {
    width: 100%;
    display: block;
}

.form-actions {
    display: flex;
    gap: 15px;
    margin-top: 25px;
}

/* Tables */
.table-responsive {
    overflow-x: auto;
}

.table {
    width: 100%;
    border-collapse: collapse;
}

.table thead {
    background-color: #f9fafb;
}

.table th {
    padding: 12px;
    text-align: left;
    font-weight: 600;
    color: var(--text-primary);
    border-bottom: 2px solid var(--border-color);
}

.table td {
    padding: 12px;
    border-bottom: 1px solid var(--border-color);
}

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

.text-center {
    text-align: center;
}

.text-right {
    text-align: right;
}

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

/* Badges */
.badge {
    display: inline-block;
    padding: 4px 12px;
    border-radius: 12px;
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.badge-paid {
    background-color: #d1fae5;
    color: #065f46;
}

.badge-pending {
    background-color: #fef3c7;
    color: #92400e;
}

.badge-partial {
    background-color: #dbeafe;
    color: #1e40af;
}

/* Alerts */
.alert {
    padding: 15px 20px;
    border-radius: 6px;
    margin-bottom: 20px;
    border-left: 4px solid;
}

.alert-success {
    background-color: #d1fae5;
    color: #065f46;
    border-left-color: var(--success-color);
}

.alert-error {
    background-color: #fee2e2;
    color: #991b1b;
    border-left-color: var(--danger-color);
}

/* Login Page */
.login-page {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    background: linear-gradient(135deg, var(--primary-color) 0%, #1e40af 100%);
}

.login-container {
    width: 100%;
    max-width: 450px;
    padding: 20px;
}

.login-box {
    background: white;
    padding: 40px;
    border-radius: 12px;
    box-shadow: var(--shadow-lg);
}

.login-header {
    text-align: center;
    margin-bottom: 30px;
}

.login-header h1 {
    font-size: 32px;
    color: var(--primary-color);
    margin-bottom: 10px;
}

.login-header p {
    color: var(--text-secondary);
}

.login-footer {
    margin-top: 25px;
    text-align: center;
    padding-top: 20px;
    border-top: 1px solid var(--border-color);
}

/* Bill Preview */
.bill-preview {
    background: white;
    padding: 40px;
    margin: 20px auto;
    max-width: 900px;
    box-shadow: var(--shadow-lg);
    border-radius: 8px;
}

.bill-header {
    display: flex;
    justify-content: space-between;
    margin-bottom: 30px;
}

.company-info h1 {
    font-size: 28px;
    color: var(--primary-color);
    margin-bottom: 10px;
}

.company-info p {
    margin: 5px 0;
    color: var(--text-secondary);
}

.invoice-info {
    text-align: right;
}

.invoice-info h2 {
    font-size: 32px;
    color: var(--primary-color);
    margin-bottom: 10px;
}

.bill-divider {
    border: none;
    border-top: 2px solid var(--border-color);
    margin: 20px 0;
}

.customer-section {
    margin-bottom: 30px;
}

.customer-section h3 {
    margin-bottom: 10px;
    color: var(--text-primary);
}

.bill-table {
    width: 100%;
    border-collapse: collapse;
    margin: 20px 0;
}

.bill-table thead {
    background-color: var(--primary-color);
    color: white;
}

.bill-table th,
.bill-table td {
    padding: 12px;
    text-align: left;
    border: 1px solid var(--border-color);
}

.bill-table tfoot td {
    font-weight: 600;
    background-color: #f9fafb;
}

.bill-notes {
    margin: 20px 0;
    padding: 15px;
    background-color: #fffbeb;
    border-left: 4px solid var(--warning-color);
    border-radius: 4px;
}

.bill-footer {
    margin-top: 40px;
    text-align: center;
}

/* Filter Form */
.filter-form .form-row {
    display: flex;
    gap: 15px;
    align-items: flex-end;
}

.filter-form .form-group {
    flex: 1;
    margin-bottom: 0;
}

/* Print Styles */
@media print {
    .no-print {
        display: none !important;
    }
    
    body {
        background: white;
    }
    
    .bill-preview {
        box-shadow: none;
        padding: 20px;
    }
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-container {
        flex-direction: column;
        padding: 10px;
    }
    
    .nav-menu {
        flex-direction: column;
        width: 100%;
        gap: 5px;
    }
    
    .nav-link {
        width: 100%;
        text-align: center;
    }
    
    .nav-user {
        margin-left: 0;
        padding-left: 0;
        border-left: none;
        flex-direction: column;
        width: 100%;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .page-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 15px;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .status-summary {
        flex-direction: column;
        gap: 20px;
    }
    
    .bill-header {
        flex-direction: column;
        gap: 20px;
    }
    
    .invoice-info {
        text-align: left;
    }
    
    .filter-form .form-row {
        flex-direction: column;
    }
    
    .form-actions {
        flex-direction: column;
    }
    
    .form-actions .btn {
        width: 100%;
    }
}