.advertise-container {
    max-width: 690px;
    margin: 0 auto;
    padding: 20px;
    width: 100%;
    box-sizing: border-box;
    
}

.card {
    background: #141b2a;
    border-radius: 12px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.08);
    margin-bottom: 30px;
    overflow: hidden;
    width: 100%;
    box-sizing: border-box;
}

.card-body {
    padding: 30px;
    width: 100%;
    box-sizing: border-box;
}

.form-group {
    margin-bottom: 25px;
    width: 100%;
    box-sizing: border-box;
}

.alert {
    border-radius: 8px;
    padding: 15px 20px;
    margin-bottom: 20px;
    width: 100%;
    box-sizing: border-box;
}

.btn {
    padding: 12px 30px;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    box-sizing: border-box;
}

.btn-default {
    background: #6c757d;
    color: white;
}

.btn-default:hover {
    background: #5a6268;
    transform: translateY(-2px);
}

.btn-primary {
    background: #007bff;
    color: white;
}

.btn-primary:hover {
    background: #0056b3;
    transform: translateY(-2px);
}

.settings-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
    margin-bottom: 25px;
    width: 100%;
    box-sizing: border-box;
}

.settings-card {
    background: #141b2a;
    border-radius: 10px;
    padding: 20px;
    border: 1px solid #e9ecef;
    width: 100%;
    box-sizing: border-box;
}

.settings-label {
    font-weight: 600;
    margin-bottom: 10px;
    color: #ffffff;
    font-size: 14px;
}

.file-upload-container {
    display: flex;
    gap: 10px;
    align-items: center;
    width: 100%;
    box-sizing: border-box;
}

.file-upload-display {
    flex: 1;
    padding: 12px 15px;
    border: 2px solid #e9ecef;
    border-radius: 8px;
    background: #141b2a;
    font-size: 14px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    min-width: 0;
    box-sizing: border-box;
    max-width: calc(100% - 120px);
}

.file-upload-button {
    padding: 12px 20px;
    background: #6c757d;
    color: white;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 600;
    transition: background 0.3s ease;
    box-sizing: border-box;
    white-space: nowrap;
}

.file-upload-button:hover {
    background: #5a6268;
}

.file-upload-input {
    display: none;
}

.sites-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 20px;
    margin-top: 30px;
    width: 100%;
    box-sizing: border-box;
}

.site-card {
    background: #192030;
    border: 2px solid #131a29;
    border-radius: 12px;
    padding: 20px;
    transition: all 0.3s ease;
    position: relative;
    width: 100%;
    box-sizing: border-box;
    min-width: 0;
}

.site-card:hover {
    border-color: #192030;
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(0,0,0,0.1);
}

.site-card.selected {
    border-color: #ffffff;
    background: #d1ecf1;
}

.site-header {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    margin-bottom: 15px;
    width: 100%;
    box-sizing: border-box;
}

.site-checkbox {
    transform: scale(1.3);
    margin-top: 3px;
}

.site-url {
    flex: 1;
    min-width: 0;
}

.site-url a {
    color: #007bff;
    text-decoration: none;
    font-weight: 600;
    word-break: break-all;
    line-height: 1.4;
    display: block;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.site-url a:hover {
    text-decoration: underline;
}

.site-details {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
    margin-bottom: 20px;
    width: 100%;
    box-sizing: border-box;
}

.detail-item {
    display: flex;
    flex-direction: column;
    gap: 4px;
    min-width: 0;
}

.detail-label {
    font-size: 12px;
    color: #666;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.detail-value {
    font-size: 16px;
    font-weight: 600;
    color: #333;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.detail-value.price {
    color: #e44d26;
    font-size: 18px;
}

.site-actions {
    display: flex;
    gap: 10px;
    width: 100%;
    box-sizing: border-box;
}

.btn-buy {
    flex: 1;
    padding: 10px 15px;
    background: #28a745;
    color: white;
    border: none;
    border-radius: 6px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.3s ease;
    box-sizing: border-box;
    min-width: 0;
}

.btn-buy:hover {
    background: #218838;
}

.selection-panel {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: #fff;
    border-top: 3px solid #007bff;
    padding: 20px;
    box-shadow: 0 -5px 25px rgba(0,0,0,0.15);
    z-index: 1000;
    transform: translateY(100%);
    transition: transform 0.3s ease;
    width: 100%;
    box-sizing: border-box;
}

.selection-panel.active {
    transform: translateY(0);
}

.selection-content {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 20px;
    width: 100%;
    box-sizing: border-box;
}

.selection-info {
    flex: 1;
    min-width: 0;
}

.selection-title {
    font-size: 18px;
    font-weight: 300;
    color: #333;
    margin-bottom: 5px;
}

.selection-details {
    font-size: 14px;
    color: #666;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.selection-actions {
    display: flex;
    gap: 15px;
    flex-shrink: 0;
}

.btn-pay {
    padding: 12px 30px;
    background: #28a745;
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.3s ease;
    box-sizing: border-box;
    white-space: nowrap;
}

.btn-pay:hover {
    background: #218838;
}

.btn-clear {
    padding: 12px 20px;
    background: #6c757d;
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 14px;
    cursor: pointer;
    transition: background 0.3s ease;
    box-sizing: border-box;
    white-space: nowrap;
}

.btn-clear:hover {
    background: #5a6268;
}

.layout-slider {
    margin: 15px 0;
    width: 100%;
    box-sizing: border-box;
}

.checkbox-container {
    display: flex;
    align-items: center;
    gap: 8px;
    width: 100%;
    box-sizing: border-box;
}

.checkbox-container input[type="checkbox"] {
    transform: scale(1.2);
}

@media (max-width: 768px) {
    .advertise-container {
        padding: 15px;
        max-width: 100%;
    }

    .card-body {
        padding: 20px;
    }

    .sites-grid {
        grid-template-columns: 1fr;
        gap: 15px;
        padding: 0;
    }

    .settings-grid {
        grid-template-columns: 1fr;
        gap: 15px;
    }

    .settings-card {
        padding: 15px;
    }

    .selection-content {
        flex-direction: column;
        text-align: center;
        gap: 15px;
        padding: 0 15px;
    }

    .selection-actions {
        width: 100%;
        justify-content: center;
        flex-wrap: wrap;
    }

    .site-details {
        grid-template-columns: 1fr;
        gap: 10px;
    }

    .site-card {
        padding: 15px;
        margin: 0;
    }

    .file-upload-container {
        flex-direction: column;
        gap: 10px;
    }

    .file-upload-display {
        max-width: 100%;
        width: 100%;
    }

    .file-upload-button {
        width: 100%;
    }

    .btn-pay, .btn-clear {
        padding: 12px 20px;
        flex: 1;
        min-width: 120px;
    }
}

@media (max-width: 480px) {
    .advertise-container {
        padding: 10px;
    }

    .card-body {
        padding: 15px;
    }

    .sites-grid {
        gap: 12px;
    }

    .site-card {
        padding: 12px;
    }

    .selection-content {
        padding: 0 10px;
    }

    .selection-actions {
        flex-direction: column;
        gap: 10px;
        width: 100%;
    }

    .btn-pay, .btn-clear {
        width: 100%;
        margin: 0;
    }

    .settings-grid {
        gap: 12px;
    }

    .settings-card {
        padding: 12px;
    }

    .form-control {
        padding: 10px 12px;
        font-size: 14px;
    }

    .btn {
        padding: 10px 20px;
        font-size: 14px;
    }

    .page-title {
        font-size: 24px;
        margin-bottom: 20px;
    }

    .selection-title {
        font-size: 16px;
    }

    .selection-details {
        font-size: 13px;
    }
}

@media (max-width: 360px) {
    .advertise-container {
        padding: 8px;
    }

    .card-body {
        padding: 12px;
    }

    .site-card {
        padding: 10px;
    }

    .detail-value {
        font-size: 14px;
    }

    .detail-value.price {
        font-size: 16px;
    }

    .btn-buy {
        padding: 8px 12px;
        font-size: 13px;
    }
}