styles.css

:root {
    --primary-color: #3b82f6;
    --primary-hover: #2563eb;
    --text-dark: #111827;
    --text-light: #6b7280;
    --bg-light: #f9fafb;
    --border-color: #e5e7eb;
    --error-color: #dc2626;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background-color: var(--bg-light);
    color: var(--text-dark);
    line-height: 1.5;
}

.container {
    max-width: 64rem;
    margin: 0 auto;
    padding: 1.5rem;
}

.header {
    text-align: center;
    margin-bottom: 3rem;
}

.header h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.header p {
    color: var(--text-light);
    font-size: 1.125rem;
}

.generator-form {
    background: white;
    border-radius: 0.75rem;
    padding: 2rem;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    margin-bottom: 0.5rem;
}

.input-wrapper {
    position: relative;
}

.input-wrapper i {
    position: absolute;
    left: 0.75rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-light);
}

.input-wrapper input {
    width: 100%;
    padding: 0.625rem 0.75rem 0.625rem 2.5rem;
    border: 1px solid var(--border-color);
    border-radius: 0.375rem;
    font-size: 1rem;
    transition: all 0.2s;
}

.input-wrapper input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.input-wrapper input:invalid {
    border-color: var(--error-color);
}

.input-wrapper input:not(:placeholder-shown):invalid + .error {
    display: block;
}

.error {
    color: var(--error-color);
    font-size: 0.875rem;
    margin-top: 0.5rem;
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

.generate-btn, .download-btn {
    width: 100%;
    background-color: var(--primary-color);
    color: white;
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: 0.375rem;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: background-color 0.2s;
}

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

button:disabled {
    opacity: 0.7;
    cursor: not-allowed;
}

.preview-section {
    margin-top: 2rem;
}

.preview-section.hidden {
    display: none;
}

.preview-section h2 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--text-dark);
}

.preview-container {
    position: relative;
    width: 100%;
    margin: 1.5rem 0;
    border-radius: 0.5rem;
    overflow: hidden;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

#previewFrame {
    width: 100%;
    min-height: 600px;
    border: none;
    background-color: white;
}

.download-section {
    margin-top: 2rem;
}

.instructions {
    margin-top: 1.5rem;
    padding: 1.5rem;
    background-color: #eff6ff;
    border-radius: 0.5rem;
}

.instructions h3 {
    color: #1e3a8a;
    margin-bottom: 1rem;
    font-size: 1.25rem;
}

.instructions ol {
    padding-left: 1.5rem;
    color: #1e40af;
}

.instructions li {
    margin: 0.75rem 0;
}

.instructions code {
    background-color: #dbeafe;
    padding: 0.25rem 0.5rem;
    border-radius: 0.25rem;
    font-family: monospace;
}

@media (max-width: 640px) {
    .container {
        padding: 1rem;
    }

    .header h1 {
        font-size: 2rem;
    }

    .generator-form {
        padding: 1.5rem;
    }
}

/* Loading Spinner */
.loading-spinner {
    display: inline-block;
    width: 1rem;
    height: 1rem;
    margin-right: 0.5rem;
    border: 2px solid #ffffff;
    border-radius: 50%;
    border-top-color: transparent;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}