/* Modern Professional Billing Software CSS */

:root {
    --primary-color: #4f46e5;
    --primary-dark: #4338ca;
    --secondary-color: #10b981;
    --danger-color: #ef4444;
    --warning-color: #f59e0b;
    --dark: #1f2937;
    --dark-light: #374151;
    --gray: #6b7280;
    --gray-light: #f3f4f6;
    --white: #ffffff;
    --border: #e5e7eb;
    --sidebar-width: 260px;
    --header-height: 70px;
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: var(--gray-light);
    color: var(--dark);
    line-height: 1.6;
}

/* Sidebar */
.sidebar {
    position: fixed;
    left: 0;
    top: 0;
    width: var(--sidebar-width);
    height: 100vh;
    background: var(--dark);
    color: var(--white);
    overflow-y: auto;
    transition: transform 0.3s ease;
    z-index: 1000;
}

.sidebar-header {
    padding: 20px;
    background: var(--dark-light);
    border-bottom: 1px solid rgba(255,255,255,0.1);
}

.sidebar-header h2 {
    font-size: 1.5rem;
    display: flex;
    align-items: center;
    gap: 10px;
    display: block;
    width: 180px;   
    white-space: nowrap;     
    overflow: hidden;        
    text-overflow: ellipsis; 
    position: relative;
    cursor: pointer;
}
.sidebar-header h2:hover::after {
    content: attr(title);
    position: absolute;
    left: 0;
    bottom: -30px;
    background: #333;
    color: #fff;
    padding: 5px 10px;
    font-size: 12px;
    border-radius: 8px;
    white-space: nowrap;
}

.sidebar-nav {
    padding: 20px 0;
}

.nav-section {
    padding: 15px 20px 5px;
    font-size: 0.75rem;
    text-transform: uppercase;
    color: var(--gray);
    font-weight: 600;
    letter-spacing: 1px;
}

.sidebar-nav a {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 20px;
    color: rgba(255,255,255,0.8);
    text-decoration: none;
    transition: all 0.3s ease;
    border-left: 3px solid transparent;
}

.sidebar-nav a:hover {
    background: rgba(255,255,255,0.1);
    color: var(--white);
    border-left-color: var(--primary-color);
}

.sidebar-nav a.active {
    background: rgba(79, 70, 229, 0.2);
    color: var(--white);
    border-left-color: var(--primary-color);
}

.sidebar-nav a i {
    width: 20px;
    text-align: center;
}

/* Main Content */
.main-content {
    margin-left: var(--sidebar-width);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Header */
.top-header {
    height: var(--header-height);
    background: var(--white);
    border-bottom: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 30px;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

.header-left {
    display: flex;
    align-items: center;
    gap: 20px;
}

.menu-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--dark);
}

.page-title {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--dark);
}

.header-right {
    display: flex;
    align-items: center;
    gap: 20px;
}

.user-info {
    display: flex;
    align-items: center;
    gap: 15px;
}

.user-name {
    font-weight: 500;
    color: var(--dark);
}

.user-dropdown {
    position: relative;
}

.user-btn {
    background: none;
    border: none;
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    font-size: 1.2rem;
    color: var(--dark);
    padding: 8px;
    border-radius: 8px;
    transition: background 0.3s;
}

.user-btn:hover {
    background: var(--gray-light);
}

.dropdown-menu {
    position: absolute;
    right: 0;
    top: 100%;
    margin-top: 10px;
    background: var(--white);
    border: 1px solid var(--border);
    border-radius: 8px;
    min-width: 180px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all 0.3s;
}

.user-dropdown:hover .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dropdown-menu a {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px 20px;
    color: var(--dark);
    text-decoration: none;
    transition: background 0.3s;
}

.dropdown-menu a:first-child {
    border-radius: 8px 8px 0 0;
}

.dropdown-menu a:last-child {
    border-radius: 0 0 8px 8px;
}

.dropdown-menu a:hover {
    background: var(--gray-light);
}

/* Content Area */
.content {
    flex: 1;
    padding: 30px;
}

/* Cards */
.card {
    background: var(--white);
    border-radius: 12px;
    padding: 25px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.05);
    margin-bottom: 25px;
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    padding-bottom: 15px;
    border-bottom: 1px solid var(--border);
}

.card-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--dark);
}

/* Dashboard Stats */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 25px;
    margin-bottom: 30px;
}

.stat-card {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: var(--white);
    padding: 25px;
    border-radius: 12px;
    box-shadow: 0 4px 12px rgba(79, 70, 229, 0.2);
    transition: transform 0.3s;
}

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

.stat-card.success {
    background: linear-gradient(135deg, #10b981, #059669);
}

.stat-card.warning {
    background: linear-gradient(135deg, #f59e0b, #d97706);
}

.stat-card.danger {
    background: linear-gradient(135deg, #ef4444, #dc2626);
}

.stat-card .stat-icon {
    font-size: 2.5rem;
    opacity: 0.8;
    margin-bottom: 10px;
}

.stat-card .stat-value {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 5px;
}

.stat-card .stat-label {
    font-size: 0.9rem;
    opacity: 0.9;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    border: none;
    border-radius: 8px;
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s;
    text-decoration: none;
    justify-content: center;
}

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

.btn-primary:hover {
    background: var(--primary-dark);
    box-shadow: 0 4px 12px rgba(79, 70, 229, 0.3);
}

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

.btn-success:hover {
    background: #059669;
    box-shadow: 0 4px 12px rgba(16, 185, 129, 0.3);
}

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

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

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

.btn-secondary:hover {
    background: var(--dark-light);
}

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

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

.form-control {
    width: 100%;
    padding: 12px 15px;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 0.95rem;
    transition: all 0.3s;
    font-family: inherit;
}

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

select.form-control {
    cursor: pointer;
}

textarea.form-control {
    resize: vertical;
    min-height: 100px;
}

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

/* Tables */
.table-container {
    overflow-x: auto;
    border-radius: 8px;
}

table {
    width: 100%;
    border-collapse: collapse;
    background: var(--white);
}

table thead {
    background: var(--gray-light);
}

table th {
    padding: 15px;
    text-align: left;
    font-weight: 600;
    color: var(--dark);
    border-bottom: 2px solid var(--border);
}

table td {
    padding: 15px;
    border-bottom: 1px solid var(--border);
    color: var(--dark);
}

table tbody tr:hover {
    background: rgba(79, 70, 229, 0.05);
}

/* Badges */
.badge {
    display: inline-block;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 500;
}

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

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

.badge-danger {
    background: #fee2e2;
    color: #991b1b;
}

.badge-primary {
    background: #e0e7ff;
    color: #3730a3;
}

/* Alerts */
.alert {
    padding: 15px 20px;
    border-radius: 8px;
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.alert-success {
    background: #d1fae5;
    color: #065f46;
    border-left: 4px solid #10b981;
}

.alert-danger {
    background: #fee2e2;
    color: #991b1b;
    border-left: 4px solid #ef4444;
}

.alert-warning {
    background: #fef3c7;
    color: #92400e;
    border-left: 4px solid #f59e0b;
}

.alert-info {
    background: #dbeafe;
    color: #1e40af;
    border-left: 4px solid #3b82f6;
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.5);
    z-index: 2000;
    justify-content: center;
    align-items: center;
}

.modal.show {
    display: flex;
}

.modal-content {
    background: var(--white);
    border-radius: 12px;
    max-width: 600px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
}

.modal-header {
    padding: 20px 25px;
    border-bottom: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-title {
    font-size: 1.25rem;
    font-weight: 600;
}

.modal-close {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--gray);
}

.modal-body {
    padding: 25px;
}

.modal-footer {
    padding: 20px 25px;
    border-top: 1px solid var(--border);
    display: flex;
    justify-content: flex-end;
    gap: 10px;
}

/* Footer */
.footer {
    padding: 20px 30px;
    background: var(--white);
    border-top: 1px solid var(--border);
    text-align: center;
    color: var(--gray);
}

/* Login Page */
.login-container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    padding: 20px;
}

.login-card {
    background: var(--white);
    padding: 40px;
    border-radius: 16px;
    box-shadow: 0 8px 24px rgba(0,0,0,0.15);
    max-width: 450px;
    width: 100%;
}

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

.login-header h1 {
    font-size: 2rem;
    color: var(--dark);
    margin-bottom: 10px;
}

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

/* Action Buttons */
.action-btns {
    display: flex;
    gap: 10px;
}

.btn-sm {
    padding: 6px 12px;
    font-size: 0.85rem;
}

.btn-icon {
    width: 32px;
    height: 32px;
    padding: 0;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

/* Responsive */
@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-100%);
    }
    
    .sidebar.show {
        transform: translateX(0);
    }
    
    .main-content {
        margin-left: 0;
    }
    
    .menu-toggle {
        display: block;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .content {
        padding: 20px 15px;
    }
    
    .top-header {
        padding: 0 15px;
    }
    
    .user-name {
        display: none;
    }
}

/* Utility Classes */
.text-center { text-align: center; }
.text-right { text-align: right; }
.mt-20 { margin-top: 20px; }
.mb-20 { margin-bottom: 20px; }
.d-flex { display: flex; }
.justify-between { justify-content: space-between; }
.align-center { align-items: center; }
.gap-10 { gap: 10px; }
.w-100 { width: 100%; }