:root {
    --bg: #0f0f12;
    --card: #1a1a22;
    --accent: #00ff9d;
    --text: #e0e0e0;
    --muted: #888;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg);
    color: var(--text);
    padding: 20px;
}

header { text-align: center; margin-bottom: 30px; }

h1 {
    font-size: 2.4rem;
    background: linear-gradient(90deg, #00ff9d, #00cc7a);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.subtitle { color: var(--muted); font-size: 1.1rem; }

.container {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr 420px;
    gap: 30px;
}

.editor, .preview-panel {
    background: var(--card);
    border-radius: 16px;
    padding: 28px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.4);
}

.upload-section { margin-bottom: 32px; }

.label {
    color: var(--accent);
    font-size: 0.95rem;
    margin-bottom: 8px;
    display: block;
}

.upload-zone {
    border: 2px dashed #444;
    border-radius: 12px;
    padding: 40px 20px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s;
}

.upload-zone:hover {
    border-color: var(--accent);
    background: rgba(0,255,157,0.05);
}

.preview-card {
    width: 100%;
    aspect-ratio: 3.5 / 2;
    background: #111;
    border: 2px solid #333;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 15px 35px rgba(0,0,0,0.6);
    margin: 12px 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: #1a1a22;
}

.card-img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    background: #fff;
    display: block;
}

.hidden {
    display: none !important;
}

button {
    background: var(--accent);
    color: #000;
    border: none;
    padding: 16px;
    font-size: 1.1rem;
    font-weight: 600;
    border-radius: 8px;
    cursor: pointer;
    width: 100%;
    margin-top: 10px;
}

button:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 25px rgba(0,255,157,0.3);
}

.info {
    text-align: center;
    color: var(--muted);
    font-size: 0.9rem;
    margin-top: 25px;
}
.upload-zone {
    transition: all 0.2s ease;
}

.upload-zone.drag-active {
    border-color: var(--accent);
    background: rgba(0, 255, 157, 0.1);
}