@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600&display=swap');

:root {
    --accent-color: #3498db;
    --accent-hover: #2980b9;
    --text-color: #2c3e50;
    --text-light: #7f8c8d;
    --background: #ffffff;
    --border-color: #ddd;
    --success-bg: #d4edda;
    --success-text: #155724;
    --error-bg: #f8d7da;
    --error-text: #721c24;
    --required: #e74c3c;
    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    --transition: all 0.3s ease;
}

body {
    font-family: var(--font-sans);
    background: var(--background);
    color: var(--text-color);
    margin: 0;
    padding: 0;
    font-size: 16px;
    line-height: 1.5;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.container {
    max-width: 680px;
    margin: 0 auto;
    padding: 2rem 1rem;
    flex: 1;
}

h1 {
    font-size: 1.75rem;
    font-weight: 600;
    color: var(--text-color);
    text-align: center;
    margin-bottom: 2rem;
    letter-spacing: -0.02em;
}

h2 {
    color: var(--text-color);
    margin-bottom: 30px;
    font-size: 1.25rem;
    font-weight: 600;
    letter-spacing: -0.01em;
}

.upload-section {
    background: var(--background);
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

#uploadForm {
    display: flex;
    gap: 0.75rem;
    justify-content: center;
    align-items: center;
}

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

label {
    display: block;
    margin-bottom: 5px;
    font-weight: 600;
    font-size: 14px;
    color: var(--text-color);
}

input[type="file"] {
    font-family: var(--font-sans);
    color: var(--text-color);
    padding: 10px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    background: var(--background);
    font-size: 16px;
    transition: var(--transition);
    cursor: pointer;
    width: 100%;
}

input[type="file"]:hover {
    border-color: var(--accent-color);
}

#assemblyTextbox {
    width: 100%;
    margin-top: 10px;
    padding: 10px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-family: var(--font-sans);
    font-size: 16px;
    resize: vertical;
    min-height: 200px;
}

#assemblyTextbox:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 2px rgba(52, 152, 219, 0.2);
}

button {
    background-color: var(--accent-color);
    color: white;
    border: none;
    padding: 12px 20px;
    font-size: 16px;
    border-radius: 4px;
    cursor: pointer;
    transition: background-color 0.3s;
    font-weight: 600;
}

button:hover:not(:disabled) {
    background-color: var(--accent-hover);
}

button:disabled {
    background-color: var(--text-light);
    color: #ffffff;
    cursor: not-allowed;
    opacity: 0.6;
}

.button-group {
    display: flex;
    gap: 0.5rem;
    margin: 10px 0;
    flex-wrap: nowrap;
}

.output-section {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.output-box {
    background: var(--background);
    padding: 1rem;
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.output-box h2 {
    margin-top: 0;
    margin-bottom: 0.5rem;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.5rem;
}

pre {
    font-family: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;
    font-size: 0.875rem;
    line-height: 1.5;
    background-color: var(--background);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    padding: 0.75rem;
    margin: 0;
    overflow-x: auto;
    white-space: pre-wrap;
    word-wrap: break-word;
}

pre.error {
    color: var(--error-text);
    background-color: var(--error-bg);
    border-color: var(--error-text);
}

#descriptionOutput {
    font-family: var(--font-sans);
    font-size: 1rem;
    line-height: 1.6;
    background-color: var(--background);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    padding: 0.75rem;
    margin: 0;
    white-space: pre-wrap;
    word-wrap: break-word;
}

#descriptionOutput.error {
    color: var(--error-text);
    background-color: var(--error-bg);
    border-color: var(--error-text);
}

.loading {
    text-align: center;
    padding: 1rem;
    display: none;
    color: var(--text-light);
    font-size: 0.875rem;
}

.loading.error {
    color: var(--error-text);
    background-color: var(--error-bg);
    border: 1px solid var(--error-text);
    border-radius: 4px;
}

.success-message {
    background-color: var(--success-bg);
    color: var(--success-text);
    padding: 15px;
    border-radius: 4px;
    margin-top: 20px;
    display: none;
    font-size: 14px;
    font-weight: 500;
}

.error-message {
    background-color: var(--error-bg);
    color: var(--error-text);
    padding: 15px;
    border-radius: 4px;
    margin-top: 20px;
    display: none;
    font-size: 14px;
    font-weight: 500;
}

.hidden-fade {
    visibility: hidden;
    opacity: 0;
    transition: visibility 0s 2s, opacity 2s linear;
}

.required::after {
    content: " *";
    color: var(--required);
}

@media (max-width: 768px) {
    .container {
        padding: 1rem;
    }

    h1 {
        font-size: 1.5rem;
    }
}