:root {
    --bg-color: #1a1a1a;
    --card-bg: #2d2d2d;
    --text-color: #e0e0e0;
    --accent-color: #f7931a; /* Bitcoin Orange */
    --accent-hover: #e8860c;
    --border-color: #444;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    margin: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
}

.container {
    background-color: var(--card-bg);
    padding: 2rem;
    border-radius: 12px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
    width: 100%;
    max-width: 480px;
    text-align: center;
}

header h1 {
    margin-top: 0;
    color: var(--accent-color);
}

header p {
    color: #aeaeae;
    font-size: 0.9rem;
}

.upload-area {
    border: 2px dashed var(--border-color);
    border-radius: 8px;
    padding: 2rem;
    margin: 2rem 0;
    cursor: pointer;
    transition: all 0.2s ease;
}

.upload-area:hover, .upload-area.dragover {
    border-color: var(--accent-color);
    background-color: rgba(247, 147, 26, 0.05);
}

.upload-area .icon {
    font-size: 3rem;
    margin-bottom: 0.5rem;
}

.upload-area p {
    margin: 0.2rem 0;
}

.upload-area .small {
    font-size: 0.8rem;
    color: #888;
}

.options {
    text-align: left;
    margin-bottom: 1.5rem;
    display: flex;
    justify-content: center;
}

.checkbox-container {
    display: flex;
    align-items: center;
    cursor: pointer;
    font-size: 0.9rem;
}

.checkbox-container input {
    margin-right: 0.5rem;
    accent-color: var(--accent-color);
}

.primary-btn {
    background-color: var(--accent-color);
    color: white;
    border: none;
    padding: 0.8rem 1.5rem;
    font-size: 1rem;
    border-radius: 6px;
    cursor: pointer;
    transition: background-color 0.2s;
    width: 100%;
}

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

.status {
    margin: 1rem 0;
    font-size: 0.9rem;
}

.status.error {
    color: #ff5252;
}

.status.success {
    color: #4caf50;
}

.hidden {
    display: none;
}

footer {
    margin-top: 2rem;
    font-size: 0.8rem;
    color: #666;
}