/* ========== متغيرات التصميم ========== */
:root {
    --primary: #10b981;
    --primary-dark: #0da271;
    --primary-light: #d1fae5;
    --secondary: #3b82f6;
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    --info: #3b82f6;
    --light: #f8fafc;
    --dark: #1e293b;
    --gray: #64748b;
    --light-gray: #e2e8f0;
    --border-radius: 16px;
    --box-shadow: 0 10px 25px rgba(0, 0, 0, 0.08);
    --transition: all 0.3s ease;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Cairo', sans-serif;
}

body {
    background: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 100%);
    color: var(--dark);
    line-height: 1.6;
    min-height: 100vh;
}

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

/* ========== صفحة تسجيل الدخول ========== */
.login-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.login-container {
    width: 100%;
    max-width: 500px;
    animation: fadeIn 0.6s ease;
}

.logo {
    text-align: center;
    margin-bottom: 40px;
}

.logo-icon {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    width: 80px;
    height: 80px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 2.5rem;
    margin: 0 auto 20px;
    box-shadow: 0 8px 25px rgba(16, 185, 129, 0.3);
}

.logo h1 {
    color: var(--dark);
    font-size: 2.2rem;
    font-weight: 800;
    margin-bottom: 10px;
}

.logo p {
    color: var(--gray);
    font-size: 1.1rem;
}

.card {
    background-color: white;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    padding: 40px;
    transition: var(--transition);
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.12);
}

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

.login-header h2 {
    color: var(--dark);
    font-size: 1.8rem;
    margin-bottom: 10px;
}

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

.form-group {
    margin-bottom: 25px;
}

.form-group label {
    display: block;
    margin-bottom: 10px;
    color: var(--dark);
    font-weight: 600;
    font-size: 1.05rem;
}

.form-control {
    width: 100%;
    padding: 16px 20px;
    border: 2px solid var(--light-gray);
    border-radius: 10px;
    font-size: 1.05rem;
    transition: var(--transition);
    background-color: white;
}

.form-control:focus {
    border-color: var(--primary);
    outline: none;
    box-shadow: 0 0 0 4px rgba(16, 185, 129, 0.15);
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 16px 32px;
    background-color: var(--primary);
    color: white;
    border: none;
    border-radius: 10px;
    cursor: pointer;
    font-size: 1.05rem;
    font-weight: 600;
    transition: var(--transition);
    text-decoration: none;
    box-shadow: 0 6px 15px rgba(16, 185, 129, 0.3);
    width: 100%;
}

.btn:hover {
    background-color: var(--primary-dark);
    transform: translateY(-3px);
    box-shadow: 0 8px 20px rgba(16, 185, 129, 0.4);
}

.btn-secondary {
    background-color: var(--secondary);
    box-shadow: 0 6px 15px rgba(59, 130, 246, 0.3);
}

.btn-secondary:hover {
    background-color: #2563eb;
    box-shadow: 0 8px 20px rgba(59, 130, 246, 0.4);
}

.btn-light {
    background-color: var(--light-gray);
    color: var(--dark);
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.05);
}

.btn-light:hover {
    background-color: #d1d5db;
}

.btn-danger {
    background-color: var(--danger);
    box-shadow: 0 6px 15px rgba(239, 68, 68, 0.3);
}

.btn-danger:hover {
    background-color: #dc2626;
    box-shadow: 0 8px 20px rgba(239, 68, 68, 0.4);
}

.btn-warning {
    background-color: var(--warning);
    box-shadow: 0 6px 15px rgba(245, 158, 11, 0.3);
}

.btn-warning:hover {
    background-color: #d97706;
    box-shadow: 0 8px 20px rgba(245, 158, 11, 0.4);
}

.btn-info {
    background-color: var(--info);
    box-shadow: 0 6px 15px rgba(59, 130, 246, 0.3);
}

.btn-info:hover {
    background-color: #2563eb;
}

.btn-sm {
    padding: 10px 20px;
    font-size: 0.95rem;
}

.btn-large {
    padding: 20px 40px;
    font-size: 1.2rem;
    width: 100%;
}

.alert {
    padding: 15px 20px;
    border-radius: 10px;
    margin-bottom: 25px;
    display: flex;
    align-items: center;
    gap: 10px;
    animation: slideIn 0.4s ease;
}

.alert-error {
    background-color: rgba(239, 68, 68, 0.1);
    color: #ef4444;
    border-right: 4px solid #ef4444;
}

.alert-success {
    background-color: rgba(16, 185, 129, 0.1);
    color: var(--primary);
    border-right: 4px solid var(--primary);
}

.alert-warning {
    background-color: rgba(245, 158, 11, 0.1);
    color: var(--warning);
    border-right: 4px solid var(--warning);
}

.hidden {
    display: none !important;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes slideIn {
    from { opacity: 0; transform: translateX(-30px); }
    to { opacity: 1; transform: translateX(0); }
}

/* ========== لوحة المسؤول ========== */
.admin-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 40px;
    flex-wrap: wrap;
    gap: 20px;
    padding: 25px 30px;
    background: white;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
}

.header-info h1 {
    color: var(--dark);
    font-size: 1.8rem;
    margin-bottom: 8px;
}

.header-info p {
    color: var(--gray);
    font-size: 1.05rem;
}

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

.user-avatar {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.5rem;
    font-weight: 700;
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.15);
}

/* ========== التبويبات - تصميم محسن ========== */
.tabs-container {
    background: white;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    margin-bottom: 30px;
    overflow: hidden;
}

.tabs-header {
    display: flex;
    overflow-x: auto;
    background: linear-gradient(to right, var(--primary-light), #e0f2ff);
    border-bottom: 2px solid var(--primary);
    padding: 0;
    scrollbar-width: none;
}

.tabs-header::-webkit-scrollbar {
    display: none;
}

.tab-btn {
    padding: 18px 25px;
    background: none;
    border: none;
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--gray);
    cursor: pointer;
    transition: var(--transition);
    white-space: nowrap;
    display: flex;
    align-items: center;
    gap: 10px;
    border-bottom: 3px solid transparent;
    min-width: 130px;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

.tab-btn:hover {
    color: var(--primary);
    background: rgba(255, 255, 255, 0.7);
}

.tab-btn.active {
    color: white;
    background: linear-gradient(to right, var(--primary), var(--secondary));
    border-bottom-color: white;
    box-shadow: 0 4px 15px rgba(16, 185, 129, 0.3);
}

.tab-btn.active i {
    color: white;
}

.tab-btn::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(to right, rgba(16, 185, 129, 0.1), rgba(59, 130, 246, 0.1));
    opacity: 0;
    transition: var(--transition);
}

.tab-btn:hover::before {
    opacity: 1;
}

.tab-content {
    padding: 0;
    display: none;
}

.tab-content.active {
    display: block;
    animation: fadeIn 0.4s ease;
}

/* ========== الإحصائيات ========== */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 25px;
    margin-bottom: 45px;
}

.stat-card {
    background-color: white;
    padding: 30px;
    border-radius: var(--border-radius);
    text-align: center;
    box-shadow: var(--box-shadow);
    border-top: 6px solid var(--primary);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.stat-card::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 100%;
    height: 6px;
    background: linear-gradient(to left, var(--primary), var(--secondary));
}

.stat-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.12);
}

.stat-card.total-due {
    border-top-color: var(--danger);
}

.stat-card.total-due::before {
    background: linear-gradient(to left, var(--danger), #f97316);
}

.stat-card.total-paid {
    border-top-color: var(--success);
}

.stat-card.total-paid::before {
    background: linear-gradient(to left, var(--success), #22c55e);
}

.stat-card.total-balance {
    border-top-color: var(--warning);
}

.stat-card.total-balance::before {
    background: linear-gradient(to left, var(--warning), #eab308);
}

.stat-card h3 {
    color: var(--gray);
    font-size: 1.15rem;
    margin-bottom: 20px;
    font-weight: 600;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
}

.stat-card .amount {
    font-size: 2.5rem;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 10px;
}

.total-due .amount {
    color: var(--danger);
}

.total-paid .amount {
    color: var(--success);
}

.total-balance .amount {
    color: var(--warning);
}

/* ========== الجداول ========== */
.content-card {
    background-color: white;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    padding: 30px;
    margin-bottom: 30px;
}

.content-card h2 {
    color: var(--dark);
    font-size: 1.5rem;
    margin-bottom: 25px;
    padding-bottom: 15px;
    border-bottom: 2px solid var(--light-gray);
    display: flex;
    align-items: center;
    gap: 10px;
}

.table-responsive {
    overflow-x: auto;
    border-radius: var(--border-radius);
    border: 1px solid var(--light-gray);
}

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

.data-table thead {
    background: linear-gradient(to right, var(--primary), var(--secondary));
}

.data-table th {
    padding: 18px 15px;
    color: white;
    font-weight: 600;
    text-align: center;
    border: none;
}

.data-table tbody tr {
    border-bottom: 1px solid var(--light-gray);
    transition: var(--transition);
}

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

.data-table tbody tr:nth-child(even) {
    background-color: #F9FAFB;
}

.data-table tbody tr:nth-child(even):hover {
    background-color: #F3F4F6;
}

.data-table td {
    padding: 15px;
    text-align: center;
    color: var(--dark);
}

/* ========== البادجات ========== */
.badge {
    padding: 6px 12px;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
    display: inline-block;
}

.badge-success {
    background-color: rgba(16, 185, 129, 0.15);
    color: var(--success);
}

.badge-warning {
    background-color: rgba(245, 158, 11, 0.15);
    color: var(--warning);
}

.badge-danger {
    background-color: rgba(239, 68, 68, 0.15);
    color: var(--danger);
}

.badge-info {
    background-color: rgba(59, 130, 246, 0.15);
    color: var(--secondary);
}

/* ========== فواتير العميل ========== */
.invoices-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 25px;
    margin-bottom: 40px;
}

.invoice-card {
    background-color: white;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    padding: 25px;
    transition: var(--transition);
    border: 2px solid transparent;
    position: relative;
    overflow: hidden;
}

.invoice-card::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 100%;
    height: 5px;
    background: linear-gradient(to left, var(--primary), var(--secondary));
}

.invoice-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.12);
}

.invoice-card.paid {
    border-color: var(--success);
    background: linear-gradient(to bottom right, #ffffff, #f0fdf4);
    opacity: 0.95;
}

.invoice-card.paid:hover {
    transform: translateY(-3px);
}

.invoice-card.paid::before {
    background: linear-gradient(to left, var(--success), #22c55e);
}

.invoice-card.partial {
    border-color: var(--warning);
    background: linear-gradient(to bottom right, #ffffff, #fefce8);
}

.invoice-card.partial::before {
    background: linear-gradient(to left, var(--warning), #eab308);
}

.invoice-card.pending {
    border-color: var(--danger);
    background: linear-gradient(to bottom right, #ffffff, #fef2f2);
}

.invoice-card.pending::before {
    background: linear-gradient(to left, var(--danger), #f97316);
}

.invoice-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    padding-bottom: 15px;
    border-bottom: 2px solid var(--light-gray);
}

.invoice-title {
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--dark);
}

.invoice-status {
    padding: 6px 14px;
    border-radius: 20px;
    font-weight: 600;
    font-size: 0.9rem;
}

.status-paid {
    background-color: rgba(16, 185, 129, 0.15);
    color: var(--success);
}

.status-partial {
    background-color: rgba(245, 158, 11, 0.15);
    color: var(--warning);
}

.status-pending {
    background-color: rgba(239, 68, 68, 0.15);
    color: var(--danger);
}

.invoice-details {
    margin-bottom: 25px;
}

.invoice-details p {
    color: var(--gray);
    margin-bottom: 12px;
    font-size: 1.05rem;
}

.invoice-total {
    font-size: 1.8rem;
    font-weight: 800;
    color: var(--dark);
    margin-bottom: 5px;
}

.invoice-paid {
    color: var(--success);
    font-weight: 600;
    font-size: 1.1rem;
}

.invoice-remaining {
    color: var(--danger);
    font-weight: 600;
    font-size: 1.1rem;
}

.invoice-date {
    color: var(--gray);
    font-size: 0.95rem;
    margin-top: 10px;
}

.payment-progress {
    margin-top: 15px;
}

.progress-bar {
    height: 10px;
    background-color: var(--light-gray);
    border-radius: 5px;
    overflow: hidden;
    margin-bottom: 10px;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(to right, var(--primary), var(--secondary));
    border-radius: 5px;
    transition: width 0.5s ease;
}

.progress-text {
    display: flex;
    justify-content: space-between;
    font-size: 0.9rem;
    color: var(--gray);
}

/* ========== مودال الدفع ========== */
.modal-overlay {
    position: fixed;
    top: 0;
    right: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.6);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    padding: 20px;
    display: none;
}

.modal-overlay.active {
    display: flex;
}

.modal {
    background-color: white;
    border-radius: 20px;
    width: 100%;
    max-width: 500px;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: 0 25px 70px rgba(0, 0, 0, 0.4);
    animation: modalFadeIn 0.4s ease;
    position: relative;
}

@keyframes modalFadeIn {
    from { opacity: 0; transform: translateY(40px) scale(0.95); }
    to { opacity: 1; transform: translateY(0) scale(1); }
}

.modal-header {
    padding: 25px 30px 15px;
    border-bottom: 1px solid var(--light-gray);
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: sticky;
    top: 0;
    background: white;
    z-index: 10;
}

.modal-header h3 {
    color: var(--dark);
    margin: 0;
    font-size: 1.5rem;
}

.modal-close {
    background: none;
    border: none;
    font-size: 1.8rem;
    color: var(--gray);
    cursor: pointer;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    transition: var(--transition);
}

.modal-close:hover {
    background-color: var(--light-gray);
    color: var(--dark);
}

.modal-body {
    padding: 25px 30px;
}

.modal-footer {
    padding: 20px 30px;
    border-top: 1px solid var(--light-gray);
    display: flex;
    justify-content: flex-end;
    gap: 15px;
    position: sticky;
    bottom: 0;
    background: white;
}

/* ========== حالة فارغة ========== */
.empty-state {
    text-align: center;
    padding: 60px 30px;
    color: var(--gray);
    grid-column: 1 / -1;
}

.empty-state i {
    font-size: 4rem;
    margin-bottom: 25px;
    color: var(--light-gray);
}

.empty-state h3 {
    font-size: 1.8rem;
    margin-bottom: 15px;
    color: var(--dark);
}

/* ========== طرق الدفع المتاحة ========== */
.payment-methods {
    display: flex;
    flex-direction: column;
    gap: 15px;
    margin-bottom: 40px;
}

.payment-method-btn {
    background: white;
    padding: 20px;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    transition: var(--transition);
    border: 2px solid transparent;
    text-align: right;
    cursor: pointer;
    text-decoration: none;
    display: block;
    color: inherit;
    width: 100%;
}

.payment-method-btn:hover {
    border-color: var(--primary);
    transform: translateY(-3px);
}

.payment-method-btn.active {
    border-color: var(--primary);
    background-color: var(--primary-light);
}

.payment-method-btn i {
    font-size: 2rem;
    color: var(--primary);
    margin-left: 15px;
    float: right;
}

.payment-method-btn h3 {
    color: var(--dark);
    margin-bottom: 5px;
    font-size: 1.3rem;
}

.payment-method-btn p {
    color: var(--gray);
    font-size: 0.95rem;
}

/* ========== زر تفاصيل الفاتورة ========== */
.invoice-actions {
    display: flex;
    gap: 10px;
    margin-top: 20px;
}

.invoice-actions .btn {
    flex: 1;
}

/* ========== مودال تفاصيل الفاتورة ========== */
.invoice-details-modal .invoice-items {
    margin-top: 20px;
}

.invoice-item-detail {
    display: flex;
    justify-content: space-between;
    padding: 12px 0;
    border-bottom: 1px solid var(--light-gray);
}

.invoice-item-detail:last-child {
    border-bottom: none;
}

.invoice-item-detail .description {
    flex: 2;
}

.invoice-item-detail .quantity,
.invoice-item-detail .price,
.invoice-item-detail .total {
    flex: 1;
    text-align: center;
}

.invoice-total-summary {
    background: var(--light);
    padding: 20px;
    border-radius: 10px;
    margin-top: 20px;
}

.invoice-total-summary .total-row {
    display: flex;
    justify-content: space-between;
    margin-bottom: 10px;
    font-size: 1.1rem;
}

.invoice-total-summary .grand-total {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--dark);
    border-top: 2px solid var(--light-gray);
    padding-top: 15px;
    margin-top: 15px;
}

/* ========== أزرار كاملة العرض ========== */
.full-width-btn {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 20px;
    font-size: 1.1rem;
    font-weight: 600;
}

/* ========== أزرار نوع الدفع ========== */
.payment-type-btn {
    flex: 1;
    padding: 15px;
    font-size: 1.1rem;
    font-weight: 600;
}

.payment-type-btn.active {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.15);
}

/* ========== مودال التأكيد ========== */
.confirm-modal .modal {
    max-width: 400px;
}

.confirm-modal .modal-body {
    text-align: center;
}

.confirm-modal .modal-body i {
    font-size: 3rem;
    color: var(--warning);
    margin-bottom: 20px;
    display: block;
}

.confirm-modal .modal-body h4 {
    color: var(--dark);
    margin-bottom: 15px;
    font-size: 1.3rem;
}

.confirm-modal .modal-body p {
    color: var(--gray);
    margin-bottom: 20px;
}

.confirm-modal .modal-footer {
    justify-content: center;
}

/* ========== مودال الإضافة ========== */
.add-modal .modal {
    max-width: 500px;
}

/* ========== إحصائيات المدفوعات ========== */
.payment-stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.payment-stat-card {
    background-color: white;
    padding: 20px;
    border-radius: var(--border-radius);
    text-align: center;
    box-shadow: var(--box-shadow);
    border-top: 4px solid var(--primary);
    transition: var(--transition);
}

.payment-stat-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.12);
}

.payment-stat-card.vodafone {
    border-top-color: #e60000;
    background: linear-gradient(to bottom right, white, #fff5f5);
}

.payment-stat-card.instapay {
    border-top-color: #0d47a1;
    background: linear-gradient(to bottom right, white, #f0f9ff);
}

.payment-stat-card .payment-stat-amount {
    font-size: 2rem;
    font-weight: 800;
    margin: 10px 0;
    color: var(--dark);
}

.payment-stat-card .payment-stat-label {
    color: var(--gray);
    font-size: 0.9rem;
}

/* ========== أزرار تأكيد الدفع ========== */
.payment-action-buttons {
    display: flex;
    gap: 10px;
}

.payment-action-buttons .btn-sm {
    padding: 8px 16px;
    font-size: 0.85rem;
}

/* ========== تنسيقات الجوال ========== */
@media (max-width: 768px) {
    .admin-header {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .invoices-container {
        grid-template-columns: 1fr;
    }
    
    .tabs-header {
        flex-wrap: wrap;
    }
    
    .tab-btn {
        flex: 1;
        min-width: 120px;
        justify-content: center;
        padding: 15px 10px;
        font-size: 0.95rem;
    }
    
    .payment-stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .full-width-btn {
        padding: 16px;
        font-size: 1rem;
    }
    
    .invoice-actions {
        flex-direction: column;
    }
    
    .invoice-actions .btn {
        width: 100%;
    }
    
    .payment-type-btn {
        padding: 12px;
        font-size: 1rem;
    }
}

@media (max-width: 480px) {
    .card {
        padding: 25px;
    }
    
    .content-card {
        padding: 20px;
    }
    
    .full-width-btn {
        padding: 14px;
        font-size: 0.95rem;
    }
    
    .payment-type-btn {
        padding: 10px;
        font-size: 0.9rem;
    }
    
    .payment-stats-grid {
        grid-template-columns: 1fr;
    }
    
    .tab-btn {
        min-width: 100px;
        padding: 12px 8px;
        font-size: 0.9rem;
    }
}