*,
*::before,
*::after {
    box-sizing: border-box;
}

html, body {
    margin: 0;
    padding: 0;
    min-height: 100vh;
}

body.billing-portal-page,
body.single-invoice {
    background: #f0f2f5;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    color: #333;
    line-height: 1.6;
}

.billing-portal-wrap {
    display: flex;
    min-height: 100vh;
}

.billing-portal-nav {
    width: 240px;
    background: #1a1f36;
    color: #fff;
    flex-shrink: 0;
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    z-index: 100;
}

.billing-portal-nav-brand {
    padding: 24px 20px;
    border-bottom: 1px solid rgba(255,255,255,0.1);
}

.billing-portal-nav-brand h2 {
    margin: 0;
    font-size: 18px;
    font-weight: 700;
    color: #fff;
}

.billing-portal-nav-brand small {
    color: rgba(255,255,255,0.5);
    font-size: 12px;
}

.billing-portal-nav ul {
    list-style: none;
    padding: 12px 0;
    margin: 0;
}

.billing-portal-nav li a {
    display: flex;
    align-items: center;
    padding: 12px 20px;
    color: rgba(255,255,255,0.7);
    text-decoration: none;
    font-size: 14px;
    transition: all 0.2s;
    border-left: 3px solid transparent;
}

.billing-portal-nav li a:hover {
    background: rgba(255,255,255,0.05);
    color: #fff;
}

.billing-portal-nav li.active a {
    background: rgba(255,255,255,0.1);
    color: #fff;
    border-left-color: #4f6ef7;
}

.billing-portal-nav .nav-icon {
    width: 24px;
    font-size: 14px;
    margin-right: 10px;
    text-align: center;
}

.billing-portal-main {
    flex: 1;
    margin-left: 240px;
    padding: 32px 40px;
    max-width: 1200px;
}

.billing-portal-header {
    margin-bottom: 32px;
}

.billing-portal-header h1 {
    margin: 0 0 4px;
    font-size: 28px;
    font-weight: 700;
    color: #1a1f36;
}

.billing-portal-header p {
    margin: 0;
    color: #6b7280;
    font-size: 14px;
}

.billing-stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin-bottom: 32px;
}

.billing-stat-card {
    background: #fff;
    border: 1px solid #e5e7eb;
    border-radius: 8px;
    padding: 20px;
}

.billing-stat-card .stat-label {
    font-size: 13px;
    color: #6b7280;
    margin: 0 0 6px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.billing-stat-card .stat-value {
    font-size: 28px;
    font-weight: 700;
    color: #1a1f36;
    margin: 0;
}

.billing-stat-card .stat-value.green { color: #10b981; }
.billing-stat-card .stat-value.red { color: #ef4444; }
.billing-stat-card .stat-value.blue { color: #3b82f6; }

.billing-portal-login {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    background: #f0f2f5;
    padding: 20px;
}

.billing-login-card {
    background: #fff;
    border-radius: 12px;
    box-shadow: 0 4px 24px rgba(0,0,0,0.08);
    padding: 40px;
    width: 100%;
    max-width: 420px;
}

.billing-login-card h1 {
    margin: 0 0 4px;
    font-size: 24px;
    color: #1a1f36;
}

.billing-login-card .login-subtitle {
    color: #6b7280;
    margin: 0 0 28px;
    font-size: 14px;
}

.billing-login-card label {
    display: block;
    font-size: 13px;
    font-weight: 600;
    color: #374151;
    margin-bottom: 6px;
}

.billing-login-card input[type="email"],
.billing-login-card input[type="text"] {
    width: 100%;
    padding: 10px 14px;
    border: 1px solid #d1d5db;
    border-radius: 6px;
    font-size: 14px;
    transition: border-color 0.2s;
}

.billing-login-card input:focus {
    outline: none;
    border-color: #4f6ef7;
    box-shadow: 0 0 0 3px rgba(79,110,247,0.1);
}

.billing-login-card .form-group {
    margin-bottom: 20px;
}

.billing-login-card .btn-primary {
    width: 100%;
    padding: 12px;
    background: #4f6ef7;
    color: #fff;
    border: none;
    border-radius: 6px;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.2s;
}

.billing-login-card .btn-primary:hover {
    background: #3b5de7;
}

#billing-login-form {
    margin: 0;
}

#billing-login-form p {
    margin: 0 0 20px;
}

.billing-login-card label {
    display: block;
    font-size: 13px;
    font-weight: 600;
    color: #374151;
    margin-bottom: 6px;
}

#billing-login-form input[type="text"],
#billing-login-form input[type="password"],
#billing-login-form input[type="email"] {
    width: 100%;
    padding: 10px 14px;
    border: 1px solid #d1d5db;
    border-radius: 6px;
    font-size: 14px;
    transition: border-color 0.2s;
    box-sizing: border-box;
}

#billing-login-form input:focus {
    outline: none;
    border-color: #4f6ef7;
    box-shadow: 0 0 0 3px rgba(79,110,247,0.1);
}

#billing-login-form .forgetmenot {
    display: flex;
    align-items: center;
    gap: 8px;
}

#billing-login-form .forgetmenot label {
    margin: 0;
    font-size: 13px;
    font-weight: 400;
}

#billing-login-form .forgetmenot input[type="checkbox"] {
    margin: 0;
}

#billing-login-form .submit {
    margin-bottom: 0;
}

#billing-login-form input[type="submit"] {
    width: 100%;
    padding: 12px;
    background: #4f6ef7;
    color: #fff;
    border: none;
    border-radius: 6px;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.2s;
}

#billing-login-form input[type="submit"]:hover {
    background: #3b5de7;
}

.billing-login-logo {
    text-align: center;
    margin-bottom: 28px;
}

.billing-login-logo h1 {
    margin: 0 0 4px;
    font-size: 24px;
    color: #1a1f36;
}

.billing-login-logo .login-subtitle {
    color: #6b7280;
    margin: 0;
    font-size: 14px;
}

.billing-login-footer {
    text-align: center;
    margin-top: 20px;
    font-size: 13px;
}

.billing-login-footer a {
    color: #4f6ef7;
    text-decoration: none;
}

.billing-login-footer a:hover {
    text-decoration: underline;
}

#login_error {
    background: #fef2f2;
    color: #991b1b;
    border: 1px solid #fecaca;
    padding: 12px 16px;
    border-radius: 6px;
    font-size: 13px;
    margin-bottom: 20px;
}

.message {
    background: #f0fdf4;
    color: #166534;
    border: 1px solid #bbf7d0;
    padding: 12px 16px;
    border-radius: 6px;
    font-size: 13px;
    margin-bottom: 20px;
}

.billing-portal-nav-user {
    padding: 16px 20px;
    border-top: 1px solid rgba(255,255,255,0.1);
    margin-top: auto;
    display: flex;
    align-items: center;
    gap: 10px;
    color: rgba(255,255,255,0.7);
    font-size: 13px;
}

.billing-portal-nav-user .avatar {
    border-radius: 50%;
    width: 28px;
    height: 28px;
}

.billing-portal-nav-user .nav-user-name {
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.billing-alert {
    padding: 12px 16px;
    border-radius: 6px;
    font-size: 13px;
    margin-bottom: 20px;
}

.billing-alert.error {
    background: #fef2f2;
    color: #991b1b;
    border: 1px solid #fecaca;
}

.billing-alert.success {
    background: #f0fdf4;
    color: #166534;
    border: 1px solid #bbf7d0;
}

.billing-portal-card {
    background: #fff;
    border: 1px solid #e5e7eb;
    border-radius: 8px;
    overflow: hidden;
}

.billing-portal-card .card-header {
    padding: 16px 20px;
    border-bottom: 1px solid #e5e7eb;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.billing-portal-card .card-header h3 {
    margin: 0;
    font-size: 16px;
    color: #1a1f36;
}

.billing-portal-card .card-body {
    padding: 20px;
}

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

.billing-portal-table th {
    text-align: left;
    padding: 12px 16px;
    font-size: 12px;
    font-weight: 600;
    color: #6b7280;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    background: #f9fafb;
    border-bottom: 1px solid #e5e7eb;
}

.billing-portal-table td {
    padding: 14px 16px;
    font-size: 14px;
    border-bottom: 1px solid #f3f4f6;
}

.billing-portal-table tr:hover td {
    background: #f9fafb;
}

.billing-badge {
    display: inline-block;
    padding: 3px 10px;
    border-radius: 12px;
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.3px;
}

.billing-badge-draft { background: #f3f4f6; color: #6b7280; }
.billing-badge-sent { background: #dbeafe; color: #1e40af; }
.billing-badge-paid { background: #d1fae5; color: #065f46; }
.billing-badge-partial { background: #fff3cd; color: #856404; }
.billing-badge-overdue { background: #fee2e2; color: #991b1b; }
.billing-badge-cancelled { background: #f3f4f6; color: #6b7280; }

.billing-btn {
    display: inline-block;
    padding: 8px 16px;
    border-radius: 6px;
    font-size: 13px;
    font-weight: 500;
    text-decoration: none;
    cursor: pointer;
    border: none;
    transition: all 0.2s;
}

.billing-btn-sm {
    padding: 5px 12px;
    font-size: 12px;
}

.billing-btn-primary {
    background: #4f6ef7;
    color: #fff;
}

.billing-btn-primary:hover {
    background: #3b5de7;
}

.billing-btn-secondary {
    background: #f3f4f6;
    color: #374151;
}

.billing-btn-secondary:hover {
    background: #e5e7eb;
}

.billing-btn-outline {
    background: transparent;
    color: #4f6ef7;
    border: 1px solid #4f6ef7;
}

.billing-btn-outline:hover {
    background: #4f6ef7;
    color: #fff;
}

.billing-invoice-detail {
    padding: 0;
}

.billing-invoice-detail .invoice-header {
    border-bottom: 2px solid #e5e7eb;
    padding: 24px;
    display: flex;
    justify-content: space-between;
}

.billing-invoice-detail .invoice-header-left h1 {
    margin: 0;
    font-size: 14px;
    color: #6b7280;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.billing-invoice-detail .invoice-header-right {
    text-align: right;
}

.billing-invoice-detail .invoice-header-right h2 {
    margin: 0 0 4px;
    font-size: 24px;
    color: #1a1f36;
}

.billing-invoice-detail .invoice-body {
    padding: 24px;
}

.billing-invoice-detail .invoice-meta {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
    margin-bottom: 24px;
}

.billing-invoice-detail .invoice-meta h3 {
    font-size: 11px;
    text-transform: uppercase;
    color: #6b7280;
    letter-spacing: 0.5px;
    margin: 0 0 8px;
}

.billing-invoice-detail .invoice-meta p {
    margin: 2px 0;
    font-size: 14px;
    color: #1a1f36;
}

.billing-invoice-detail .invoice-items {
    width: 100%;
    border-collapse: collapse;
    margin: 20px 0;
}

.billing-invoice-detail .invoice-items th {
    background: #f9fafb;
    padding: 10px 12px;
    font-size: 11px;
    text-transform: uppercase;
    color: #6b7280;
    letter-spacing: 0.5px;
    text-align: left;
    border-bottom: 1px solid #e5e7eb;
}

.billing-invoice-detail .invoice-items th.amount {
    text-align: right;
}

.billing-invoice-detail .invoice-items td {
    padding: 10px 12px;
    font-size: 14px;
    border-bottom: 1px solid #f3f4f6;
}

.billing-invoice-detail .invoice-items td.amount {
    text-align: right;
}

.billing-invoice-detail .invoice-totals {
    text-align: right;
    padding: 20px 24px;
    border-top: 1px solid #e5e7eb;
}

.billing-invoice-detail .invoice-totals p {
    margin: 4px 0;
    font-size: 14px;
}

.billing-invoice-detail .invoice-totals .grand-total {
    font-size: 20px;
    font-weight: 700;
    color: #1a1f36;
    margin-top: 8px;
    padding-top: 8px;
    border-top: 2px solid #1a1f36;
}

.billing-invoice-detail .invoice-notes {
    padding: 20px 24px;
    border-top: 1px solid #e5e7eb;
}

.billing-invoice-detail .invoice-notes h4 {
    font-size: 11px;
    text-transform: uppercase;
    color: #6b7280;
    letter-spacing: 0.5px;
    margin: 0 0 8px;
}

.billing-invoice-detail .invoice-notes p {
    margin: 0;
    font-size: 14px;
    color: #374151;
}

.billing-invoice-detail .invoice-actions {
    padding: 16px 24px;
    background: #f9fafb;
    display: flex;
    gap: 10px;
    justify-content: flex-end;
}

.billing-profile-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

.billing-profile-field {
    margin-bottom: 0;
}

.billing-profile-field label {
    display: block;
    font-size: 11px;
    text-transform: uppercase;
    color: #6b7280;
    letter-spacing: 0.5px;
    margin-bottom: 4px;
}

.billing-profile-field p {
    margin: 0;
    font-size: 15px;
    color: #1a1f36;
    font-weight: 500;
}

.billing-search-box {
    display: flex;
    gap: 10px;
    align-items: center;
}

.billing-search-box input[type="text"] {
    padding: 8px 14px;
    border: 1px solid #d1d5db;
    border-radius: 6px;
    font-size: 13px;
    width: 220px;
}

.billing-search-box input[type="text"]:focus {
    outline: none;
    border-color: #4f6ef7;
}

.billing-empty-state {
    text-align: center;
    padding: 60px 20px;
    color: #9ca3af;
}

.billing-empty-state p {
    font-size: 15px;
    margin: 0;
}

.billing-filter-select {
    padding: 8px 14px;
    border: 1px solid #d1d5db;
    border-radius: 6px;
    font-size: 13px;
    background: #fff;
}

.billing-filter-select:focus {
    outline: none;
    border-color: #4f6ef7;
}

.billing-portal-error {
    background: #fef2f2;
    border: 1px solid #fecaca;
    color: #991b1b;
    padding: 12px 16px;
    border-radius: 6px;
    font-size: 13px;
    margin-bottom: 20px;
}

.billing-login-modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    transition: opacity 0.3s;
}

.billing-login-modal-loader {
    background: #fff;
    border-radius: 12px;
    padding: 60px;
    box-shadow: 0 4px 24px rgba(0,0,0,0.12);
}

.billing-loader {
    display: block;
    width: 32px;
    height: 32px;
    border: 3px solid #e5e7eb;
    border-top-color: #4f6ef7;
    border-radius: 50%;
    animation: billing-spin 0.8s linear infinite;
    margin: 0 auto;
}

@keyframes billing-spin {
    to { transform: rotate(360deg); }
}

.billing-login-modal-visible {
    background: rgba(0,0,0,0.5);
}

.billing-login-modal-visible .billing-login-card {
    animation: billing-fade-in 0.3s ease-out;
}

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

.billing-login-modal-visible .billing-loader {
    display: none;
}

@media (max-width: 768px) {
    .billing-portal-nav {
        width: 60px;
    }
    .billing-portal-nav .nav-label,
    .billing-portal-nav-brand h2,
    .billing-portal-nav-brand small {
        display: none;
    }
    .billing-portal-main {
        margin-left: 60px;
        padding: 20px;
    }
    .billing-stats-grid {
        grid-template-columns: 1fr 1fr;
    }
    .billing-profile-grid {
        grid-template-columns: 1fr;
    }
    .billing-invoice-detail .invoice-meta {
        grid-template-columns: 1fr;
    }
    .billing-portal-table {
        font-size: 12px;
    }
}