:root {
    --primary-color: #25D366;
    --primary-hover: #128C7E;
    --secondary-color: #4dabf7;
    --secondary-hover: #3b8fd6;
    --light-gray: #f5f5f5;
    --medium-gray: #e0e0e0;
    --dark-gray: #333;
    --success-bg: #d4edda;
    --success-text: #155724;
    --error-bg: #f8d7da;
    --error-text: #721c24;
    --highlight-color: #fff9c4;
    --completed-color: #e8f5e9;
    --sent-color: #bbdefb;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    max-width: 1000px;
    margin: 0 auto;
    padding: 20px;
    background-color: var(--light-gray);
    color: var(--dark-gray);
    line-height: 1.6;
}

h1 {
    color: var(--primary-color);
    text-align: center;
    margin-bottom: 30px;
    font-size: 2.2rem;
    position: relative;
}

h1::after {
    content: "";
    display: block;
    width: 100px;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    margin: 10px auto 0;
    border-radius: 2px;
}

.container {
    background-color: white;
    padding: 30px;
    border-radius: 12px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    margin-bottom: 30px;
}

.form-group {
    margin-bottom: 25px;
    max-width: 100%;
    width: 100%;
}

label {
    display: block;
    margin-bottom: 10px;
    font-weight: 600;
    color: var(--dark-gray);
}

input, select, textarea {
    width: 100%;
    padding: 12px;
    border: 1px solid var(--medium-gray);
    border-radius: 8px;
    font-size: 16px;
    box-sizing: border-box;
    transition: border-color 0.3s, box-shadow 0.3s;
    max-width: 100%;
}

input:focus, select:focus, textarea:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 211, 102, 0.2);
    outline: none;
}

button {
    color: white;
    border: none;
    padding: 8px 16px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 600;
    transition: all 0.3s;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
}

button:hover {
    transform: translateY(-1px);
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.1);
}

button:disabled {
    background-color: #cccccc;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

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

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

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

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

.file-upload {
    border: 2px dashed var(--medium-gray);
    padding: 30px;
    text-align: center;
    border-radius: 8px;
    margin-bottom: 20px;
    position: relative;
    transition: all 0.3s;
}

.file-upload:hover {
    border-color: var(--primary-color);
    background-color: rgba(37, 211, 102, 0.05);
}

#fileInput {
    position: absolute;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    cursor: pointer;
}

.file-upload-label {
    pointer-events: none;
}

.file-upload-label p:first-child {
    font-size: 18px;
    margin-bottom: 8px;
    color: var(--dark-gray);
}

.status {
    margin-top: 20px;
    padding: 15px;
    border-radius: 8px;
    display: none;
    font-weight: 500;
}

.success {
    background-color: var(--success-bg);
    color: var(--success-text);
    display: block;
    border-left: 4px solid var(--primary-color);
}

.error {
    background-color: var(--error-bg);
    color: var(--error-text);
    display: block;
    border-left: 4px solid #dc3545;
}

.progress-container {
    margin-top: 25px;
    display: none;
}

.progress-header {
    display: flex;
    justify-content: space-between;
    margin-bottom: 8px;
}

.progress-bar {
    height: 12px;
    background-color: var(--medium-gray);
    border-radius: 6px;
    overflow: hidden;
    margin-bottom: 5px;
}

.progress {
    height: 100%;
    background: linear-gradient(90deg, var(--secondary-color), var(--primary-color));
    width: 0%;
    transition: width 0.5s ease-out;
}

.progress-text {
    font-size: 14px;
    color: var(--dark-gray);
}

.column-mapping {
    display: flex;
    gap: 20px;
    margin-top: 15px;
}

.column-select {
    flex: 1;
}

.preview-container {
    margin-top: 30px;
}

.preview-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
}

.preview-table-container {
    overflow-x: auto;
    border: 1px solid var(--medium-gray);
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}

.preview-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 14px;
}

.preview-table th, .preview-table td {
    border: 1px solid var(--medium-gray);
    padding: 12px;
    text-align: left;
    word-wrap: break-word;
    vertical-align: middle;
}

.preview-table th {
    background-color: #f8f9fa;
    position: sticky;
    top: 0;
    font-weight: 600;
}

.preview-table tr:nth-child(even) {
    background-color: #f9f9f9;
}

.preview-table tr:hover {
    background-color: #f1f1f1;
}

.preview-table tr.current {
    background-color: var(--highlight-color) !important;
    font-weight: 500;
}

.preview-table tr.completed {
    background-color: var(--completed-color) !important;
    color: #2e7d32;
}

.preview-table tr.sent {
    background-color: var(--sent-color) !important;
}

.preview-table tr.completed td {
    opacity: 0.8;
}

.send-btn {
    min-width: 80px;
}

.send-btn.sent {
    background-color: #9e9e9e;
    cursor: default;
}

.loading {
    display: none;
    text-align: center;
    margin: 20px 0;
}

.spinner {
    border: 4px solid rgba(0, 0, 0, 0.1);
    border-radius: 50%;
    border-top: 4px solid var(--primary-color);
    width: 40px;
    height: 40px;
    animation: spin 1s linear infinite;
    margin: 0 auto 15px;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.country-code-container {
    display: flex;
    gap: 15px;
    margin-top: 15px;
}

.country-code-input {
    flex: 1;
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 15px;
    cursor: pointer;
}

.checkbox-label input {
    width: auto;
    margin: 0;
}

/* Updated Message Input Styles */
.message-input {
    margin-top: 20px;
    width: 100%;
    max-width: 100%;
}

.message-input textarea {
    width: 100%;
    min-height: 100px;
    resize: vertical;
    padding: 12px;
    border: 1px solid var(--medium-gray);
    border-radius: 8px;
    font-size: 16px;
    box-sizing: border-box;
    transition: border-color 0.3s, box-shadow 0.3s;
}

.message-input textarea:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 211, 102, 0.2);
    outline: none;
}

.message-preview {
    background-color: #f8f9fa;
    border-radius: 8px;
    padding: 15px;
    margin-top: 15px;
    border-left: 4px solid var(--primary-color);
    width: 100%;
    box-sizing: border-box;
}

.message-preview h4 {
    margin-top: 0;
    color: var(--primary-color);
}

.message-variables {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 10px;
    width: 100%;
    overflow-x: auto;
}

.variable-tag {
    background-color: var(--primary-color);
    color: white;
    padding: 4px 8px;
    border-radius: 4px;
    font-size: 12px;
    cursor: pointer;
    transition: all 0.2s;
    white-space: nowrap;
}

.variable-tag:hover {
    background-color: var(--primary-hover);
    transform: translateY(-1px);
}

/* Video Tutorial Styles */
.video-tutorial {
    margin: 40px 0;
    text-align: center;
}

.video-tutorial h2 {
    color: var(--primary-color);
    margin-bottom: 20px;
    font-size: 1.8rem;
}

.video-container {
    max-width: 800px;
    margin: 0 auto;
    position: relative;
}

.video-wrapper {
    position: relative;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
    transition: transform 0.3s;
}

.video-wrapper:hover {
    transform: translateY(-5px);
}

.video-thumbnail {
    width: 100%;
    display: block;
    transition: transform 0.3s;
}

.play-button {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 80px;
    height: 80px;
    background-color: rgba(37, 211, 102, 0.8);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.3s;
    box-shadow: 0 5px 15px rgba(0,0,0,0.3);
    border: 3px solid white;
}

.play-button i {
    color: white;
    font-size: 30px;
    margin-left: 5px;
}

.play-button:hover {
    background-color: rgba(37, 211, 102, 0.9);
    transform: translate(-50%, -50%) scale(1.1);
    box-shadow: 0 8px 25px rgba(0,0,0,0.4);
}

/* Ad Container Styles */
.ad-container {
    margin: 20px 0;
    padding: 15px;
    background-color: white;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    text-align: center;
}

/* Responsive adjustments */
@media (max-width: 768px) {
    body {
        padding: 15px;
    }
    
    .container {
        padding: 20px;
    }
    
    .column-mapping {
        flex-direction: column;
        gap: 15px;
    }
    
    .preview-table th, .preview-table td {
        padding: 8px;
        font-size: 13px;
    }
    
    .send-btn {
        min-width: 70px;
        padding: 6px 10px;
        font-size: 13px;
    }
    
    .play-button {
        width: 60px;
        height: 60px;
    }
    
    .play-button i {
        font-size: 24px;
    }
    
    .video-tutorial h2 {
        font-size: 1.5rem;
    }
    
    .video-wrapper {
        box-shadow: 0 5px 15px rgba(0,0,0,0.2);
    }
    
    .message-input textarea {
        min-height: 80px;
    }
}