``css
:root {
    --primary: #00e5ff;
    --bg: #121212;
    --card-bg: #1e1e1e;
    --text: #ffffff;
}

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

header {
    text-align: center;
    padding: 20px;
    background: linear-gradient(180deg, #1a1a1a 0%, #121212 100%);
    width: 100%;
    border-bottom: 1px solid #333;
}

main {
    width: 90%;
    max-width: 500px;
    margin-top: 20px;
}

.hidden { display: none; }
.active { display: block; }

.form-group { margin-bottom: 15px; }
label { display: block; margin-bottom: 5px; color: #aaa; }
input, select, textarea {
    width: 100%;
    padding: 12px;
    background: #2a2a2a;
    border: 1px solid #444;
    color: white;
    border-radius: 8px;
    box-sizing: border-box;
}

.price-box {
    background: #252525;
    padding: 15px;
    border-radius: 8px;
    margin: 20px 0;
    border: 1px solid var(--primary);
}

.highlight { color: var(--primary); font-weight: bold; font-size: 1.2em; }

.btn-primary {
    width: 100%;
    padding: 15px;
    background: var(--primary);
    border: none;
    border-radius: 8px;
    color: #000;
    font-weight: bold;
    font-size: 16px;
    cursor: pointer;
    transition: transform 0.2s;
}

.btn-primary:active { transform: scale(0.98); }

.btn-secondary {
    width: 100%;
    padding: 10px;
    background: transparent;
    border: 1px solid #444;
    color: #aaa;
    margin-top: 20px;
    border-radius: 8px;
    cursor: pointer;
}

.status-card {
    background: var(--card-bg);
    padding: 20px;
    border-radius: 12px;
    text-align: center;
}

.progress-bar {
    background: #333;
    height: 10px;
    border-radius: 5px;
    margin: 15px 0;
    overflow: hidden;
}

.fill {
    background: var(--primary);
    height: 100%;
    font-size: 10px;
    color: black;
    display: flex;
    align-items: center;
    justify-content: center;
}

.badge {
    background: #333;
    padding: 4px 8px;
    border-radius: 4px;
    font-size: 0.9em;
}

.file-preview {
    background: #2a2a2a;
    padding: 15px;
    margin: 15px 0;
    border-radius: 8px;
    border: 1px dashed #666;
}
```