:root {
    --primary-color: #0066cc;
    --success-color: #28a745;
    --warning-color: #ffc107;
    --error-color: #dc3545;
    --text-color: #333;
    --border-color: #ddd;
    --background-color: #f8f9fa;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    margin: 0;
    padding: 20px;
    background-color: var(--background-color);
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
    background: white;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

h1 {
    text-align: center;
    color: var(--primary-color);
    margin-bottom: 30px;
}

.step {
    margin-bottom: 30px;
    padding: 20px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
}

.step.hidden {
    display: none;
}

.upload-area {
    text-align: center;
    padding: 40px;
    border: 2px dashed var(--border-color);
    border-radius: 4px;
    cursor: pointer;
}

.button-group {
    display: flex;
    gap: 10px;
    justify-content: center;
    margin-top: 20px;
}

button {
    padding: 10px 20px;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    transition: background-color 0.3s;
}

button:hover {
    background-color: #0056b3;
}

.data-preview {
    overflow-x: auto;
    margin-top: 20px;
}

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

th, td {
    padding: 8px;
    border: 1px solid var(--border-color);
    text-align: left;
}

th {
    background-color: var(--background-color);
}

.option-group {
    margin-bottom: 15px;
}

.option-group label {
    display: block;
    margin-bottom: 5px;
}

input[type="number"], select {
    padding: 8px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    width: 200px;
}

.summary {
    background-color: var(--background-color);
    padding: 15px;
    border-radius: 4px;
    margin-bottom: 20px;
}

.progress-bar {
    height: 20px;
    background-color: var(--border-color);
    border-radius: 10px;
    overflow: hidden;
    margin: 20px 0;
}

.progress {
    height: 100%;
    background-color: var(--primary-color);
    width: 0%;
    transition: width 0.3s;
}

.progress-text {
    text-align: center;
    color: var(--text-color);
}

.error {
    color: var(--error-color);
    margin-top: 10px;
}

.upload-area.dragover {
    background-color: var(--background-color);
    border-color: var(--primary-color);
}

.upload-area:hover {
    border-color: var(--primary-color);
}

button:disabled {
    background-color: var(--border-color);
    cursor: not-allowed;
}

.loading {
    opacity: 0.7;
    pointer-events: none;
}

.column-select {
    margin-top: 20px;
    display: flex;
    gap: 10px;
    justify-content: center;
}

.column-select input {
    width: 100px;
}

.summary-text {
    text-align: center;
    color: var(--success-color);
    font-weight: bold;
    margin-bottom: 20px;
}

#progressArea.hidden {
    display: none;
}

.completion-message {
    text-align: center;
    margin: 20px 0;
    padding: 20px;
    background-color: var(--success-color);
    color: white;
    border-radius: 4px;
}

.completion-details {
    font-size: 0.9em;
    margin-top: 10px;
}

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

.secondary-button:hover {
    background-color: #555;
}

#completionSection.hidden {
    display: none;
}

#generateSection.hidden,
#completionSection.hidden,
#progressArea.hidden {
    display: none !important;
}

#generateButton.hidden {
    display: none;
}

.input-method-choice {
    display: flex;
    gap: 20px;
    justify-content: center;
    margin: 40px 0;
}

.method-button {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 20px;
    width: 200px;
    background-color: white;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s;
}

.method-button:hover {
    border-color: var(--primary-color);
    background-color: var(--background-color);
}

.method-icon {
    font-size: 2em;
    margin-bottom: 10px;
}

.method-title {
    font-weight: bold;
    margin-bottom: 5px;
}

.method-desc {
    font-size: 0.9em;
    color: var(--text-color);
    text-align: center;
}

.manual-entry-row {
    margin-bottom: 10px;
}

.manual-entry {
    width: 100%;
    padding: 8px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-size: 1em;
}

.manual-entry:focus {
    border-color: var(--primary-color);
    outline: none;
}

.help-text {
    color: var(--text-color);
    text-align: center;
    margin-bottom: 20px;
}

#startOverContainer {
    text-align: center;
    margin-top: 30px;
    padding-top: 20px;
    border-top: 1px solid var(--border-color);
}

#startOverContainer.hidden {
    display: none;
}

#startOverButton {
    background-color: var(--text-color);
}

#startOverButton:hover {
    background-color: #555;
}