:root {
    --bg-color: #f8fafc;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --accent-color: #3b82f6;
    --accent-hover: #2563eb;
    --border-color: #cbd5e1;
    --card-bg: #ffffff;
    --drop-zone-bg: #f1f5f9;
}

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

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 2rem;
}

.container {
    max-width: 900px;
    width: 100%;
    background-color: var(--card-bg);
    border-radius: 16px;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.05);
    padding: 2.5rem;
}

header {
    text-align: center;
    margin-bottom: 2.5rem;
}

header h1 {
    font-size: 2rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

header p {
    color: var(--text-secondary);
}

.drop-zone {
    border: 2px dashed var(--border-color);
    border-radius: 12px;
    padding: 3rem;
    text-align: center;
    background-color: var(--drop-zone-bg);
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
    margin-bottom: 2rem;
}

.drop-zone:hover, .drop-zone.dragover {
    border-color: var(--accent-color);
    background-color: #eff6ff;
}

.drop-zone-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    transition: opacity 0.3s;
}

.drop-zone.loading .drop-zone-content {
    opacity: 0.2;
    pointer-events: none;
}

.upload-icon {
    color: var(--accent-color);
}

.drop-zone p {
    font-size: 1.1rem;
    color: var(--text-secondary);
}

.hidden {
    display: none !important;
}

/* Loading Indicator */
.loading-indicator {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid rgba(59, 130, 246, 0.2);
    border-top-color: var(--accent-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

/* Results Area */
.results-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    margin-top: 2rem;
    animation: fadeIn 0.5s ease;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.preview-card {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.preview-card h3 {
    font-size: 1.1rem;
    color: var(--text-secondary);
    text-align: center;
}

.image-wrapper {
    width: 100%;
    height: 300px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    overflow: hidden;
    background-color: var(--drop-zone-bg);
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 1rem;
}

.image-wrapper img {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
}

.svg-wrapper svg {
    max-width: 100%;
    max-height: 100%;
}

.download-btn {
    display: inline-block;
    width: 100%;
    padding: 0.8rem;
    background-color: var(--accent-color);
    color: white;
    text-align: center;
    text-decoration: none;
    border-radius: 8px;
    font-weight: 600;
    transition: background-color 0.3s;
    margin-top: auto;
}

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

@media (max-width: 768px) {
    .results-container {
        grid-template-columns: 1fr;
    }
}