/* Card-based layout */
.container {
    max-width: 900px;
    width: 100%;
    background-color: var(--white);
    border-radius: 12px;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
    padding: 32px 40px 48px;
    min-height: 1700px;
}

/* Typography */
h1 {
    font-size: 28px;
    font-weight: 600;
    color: var(--text-dark);
    text-align: center;
    margin-bottom: 32px;
    margin-top: 0;
}

h2 {
    font-size: 20px;
    font-weight: 600;
    color: var(--text-dark);
    margin-top: 32px;
    margin-bottom: 24px;
}

h3 {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 10px;
    margin-top: 0;
}

.instructional-text {
    font-size: 14px;
    font-weight: 400;
    color: var(--text-medium);
    margin-bottom: 24px;
    line-height: 1.5;
}

.instructional-text strong {
    font-weight: 500;
    color: var(--primary-blue);
}

/* Input Field Styles */
.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    font-size: 14px;
    font-weight: 500;
    color: var(--text-dark);
    margin-bottom: 8px;
}

.input-field {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--border-gray);
    border-radius: 8px;
    font-family: 'Inter', sans-serif;
    font-size: 16px;
    color: var(--text-dark);
    background-color: var(--white);
    line-height: 1.5;
}

.input-field::placeholder {
    color: var(--text-medium);
    opacity: 0.7;
}

.input-field:focus {
    border-color: var(--accent-blue);
    outline: none;
    box-shadow: 0 0 0 2px rgba(89, 152, 214, 0.2);
}

input[type='text'].input-field {
    height: 48px;
}

textarea.input-field {
    min-height: 96px;
    resize: vertical;
    padding-top: 12px;
    padding-bottom: 12px;
}

/* Dataset Field structure */
.dataset-field-row {
    display: flex;
    gap: 16px;
    align-items: flex-start;
    margin-bottom: 16px;
}

.dataset-label-input {
    flex: 1;
}

.dataset-value-input {
    flex: 3;
    position: relative;
}

.dataset-fields-container {
    margin-bottom: 24px;
}

.validation-message {
    font-size: 12px;
    color: var(--error-red);
    margin-top: 4px;
    min-height: 18px;
}

/* Remove Button */
.remove-dataset-btn {
    width: 28px;
    height: 28px;
    background-color: var(--error-red);
    border: none;
    border-radius: 50%;
    color: var(--white);
    font-size: 14px;
    font-weight: 600;
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    flex-shrink: 0;
    margin-top: 56px;
    transform: translateY(-8px);
}

.remove-dataset-btn:hover {
    background-color: var(--error-red-darker);
    transform: translateY(-9px) scale(1.05);
    box-shadow: 0 2px 8px rgba(214, 73, 55, 0.3);
}

.remove-dataset-btn:focus {
    outline: 2px solid var(--accent-blue);
    outline-offset: 2px;
}

/* Add Dataset Control */
.add-dataset-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 18px;
    background-color: var(--light-blue-bg);
    border: 1px solid var(--border-gray);
    border-radius: 8px;
    color: var(--primary-blue);
    font-size: 16px;
    font-weight: 500;
    cursor: pointer;
    width: fit-content;
    margin-bottom: 32px;
}

.add-dataset-btn:hover {
    background-color: #dfe9f3;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
    transform: translateY(-1px);
}

.add-dataset-btn:focus {
    outline: 2px solid var(--accent-blue);
    outline-offset: 2px;
}

.add-dataset-btn .fa-plus {
    font-size: 18px;
    color: var(--primary-blue);
}

/* Analysis Options */
.analysis-options-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px 24px;
    margin-top: 16px;
    margin-bottom: 32px;
}

.checkbox-group {
    display: flex;
    align-items: center;
}

.checkbox-group input[type='checkbox'] {
    appearance: none;
    -webkit-appearance: none;
    width: 20px;
    height: 20px;
    border: 2px solid var(--border-gray);
    border-radius: 4px;
    margin-right: 12px;
    cursor: pointer;
    position: relative;
    flex-shrink: 0;
    display: grid;
    place-content: center;
}

.checkbox-group input[type='checkbox']:checked {
    background-color: var(--accent-blue);
    border-color: var(--accent-blue);
}

.checkbox-group input[type='checkbox']:checked::before {
    content: '\f00c';
    font-family: 'Font Awesome 6 Free';
    font-weight: 900;
    color: var(--white);
    font-size: 12px;
}

.checkbox-group label {
    font-size: 16px;
    font-weight: 400;
    color: var(--text-dark);
    cursor: pointer;
}

.checkbox-group input[type='checkbox']:focus {
    outline: 2px solid var(--accent-blue);
    outline-offset: 2px;
}

/* Primary Action Button */
.run-analysis-btn {
    width: 100%;
    height: 56px;
    background-color: var(--primary-blue);
    color: var(--white);
    border: none;
    border-radius: 8px;
    font-size: 18px;
    font-weight: 600;
    cursor: pointer;
    text-align: center;
    display: flex;
    justify-content: center;
    align-items: center;
    box-shadow: 0 4px 12px rgba(45, 97, 164, 0.2);
    margin-top: 24px;
}

.run-analysis-btn:hover {
    background-color: #244d82;
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(45, 97, 164, 0.3);
}

.run-analysis-btn:focus {
    outline: 2px solid var(--accent-blue);
    outline-offset: 2px;
}

/* File Import Section */
.file-import-section {
    margin-top: 32px;
    margin-bottom: 24px;
    text-align: center;
}

.file-upload-wrapper {
    display: flex;
    flex-direction: column;
    align-items: center;
    border: 2px dashed var(--border-gray);
    border-radius: 12px;
    padding: 30px;
    margin-bottom: 24px;
    cursor: pointer;
    background-color: var(--white);
}

.file-upload-wrapper:hover {
    border-color: var(--accent-blue);
    background-color: rgba(89, 152, 214, 0.05);
}

.file-upload-wrapper i {
    font-size: 48px;
    color: var(--text-medium);
    margin-bottom: 16px;
}

.file-upload-wrapper p {
    margin: 0;
    font-size: 16px;
    color: var(--text-medium);
}

.file-upload-wrapper strong {
    color: var(--primary-blue);
    font-weight: 500;
    cursor: pointer;
}

.file-upload-button {
    display: inline-block;
    padding: 12px 24px;
    background-color: var(--light-blue-bg);
    border: 1px solid var(--border-light-gray);
    border-radius: 8px;
    color: var(--primary-blue);
    font-size: 16px;
    font-weight: 500;
    cursor: pointer;
    margin-top: 16px;
}

.file-upload-button:hover {
    background-color: #dfe9f3;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
    transform: translateY(-1px);
}

.file-upload-button:focus {
    outline: 2px solid var(--accent-blue);
    outline-offset: 2px;
}

.separator {
    display: flex;
    align-items: center;
    text-align: center;
    color: var(--text-medium);
    font-size: 14px;
    margin: 32px 0;
}

.separator::before,
.separator::after {
    content: '';
    flex: 1;
    border-bottom: 1px solid var(--border-gray);
}

.separator:not(:empty)::before {
    margin-right: 1em;
}

.separator:not(:empty)::after {
    margin-left: 1em;
}

/* Presets dropdown */
.preset-selection {
    margin-bottom: 24px;
}

.preset-selection label {
    font-size: 14px;
    font-weight: 500;
    color: var(--text-dark);
    margin-bottom: 8px;
    display: block;
}

.preset-selection select {
    width: 100%;
    height: 48px;
    padding: 0 16px;
    border: 1px solid var(--border-gray);
    border-radius: 8px;
    background-color: var(--white);
    font-family: 'Inter', sans-serif;
    font-size: 16px;
    color: var(--text-dark);
    cursor: pointer;
    -webkit-appearance: none;
    -moz-appearance: none;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='%235E6B7A'%3E%3Cpath d='M7 10l5 5 5-5z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
    background-size: 20px;
}

.preset-selection select:focus {
    border-color: var(--accent-blue);
    outline: none;
    box-shadow: 0 0 0 2px rgba(89, 152, 214, 0.2);
}

#file-preview {
    display: none;
    background-color: var(--background-gray);
    border: 1px solid var(--border-gray);
    border-radius: 8px;
    padding: 16px;
    margin-bottom: 24px;
    text-align: left;
}

#imported-datasets-list {
    list-style: none;
    padding: 0;
    margin: 0;
    font-size: 14px;
    color: var(--text-medium);
}

#imported-datasets-list li {
    margin-bottom: 4px;
}

#imported-datasets-list li strong {
    color: var(--text-dark);
}

/* Responsive adjustments */
@media (max-width: 768px) {
    body {
    padding: 20px 15px;
    }

    .container {
    padding: 24px 20px;
    min-height: auto;
    }

    h1 {
    font-size: 24px;
    margin-bottom: 24px;
    }

    h2 {
    font-size: 18px;
    margin-top: 24px;
    margin-bottom: 16px;
    }

    .dataset-field-row {
    flex-direction: column;
    gap: 12px;
    position: relative;
    }

    .dataset-label-input {
    width: 100%;
    order: -1;
    }

    .dataset-value-input {
    position: relative;
    width: 100%;
    }

    .remove-dataset-btn {
    position: absolute;
    top: -0.5rem;
    right: 12px;
    margin-top: 0;
    transform: translateY(0);
    }

    .add-dataset-btn {
    width: 100%;
    justify-content: center;
    }

    .analysis-options-grid {
    grid-template-columns: 1fr;
    }

    .file-upload-wrapper i {
    font-size: 36px;
    margin-bottom: 12px;
    }

    .file-upload-wrapper p {
    font-size: 14px;
    }

    .file-upload-button {
    font-size: 14px;
    padding: 10px 20px;
    }
}