body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: #f0f2f5;
    margin: 0;
    padding: 20px;
}
.container {
    max-width: 900px;
    margin: 0 auto;
    background: white;
    border-radius: 20px;
    padding: 30px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
}
h1 { color: #0a5e8c; }
.strategy-info {
    background: #e8f4fd;
    padding: 10px 15px;
    border-radius: 8px;
    border-left: 4px solid #0a5e8c;
    font-size: 0.9em;
    color: #1a5276;
    margin: 15px 0;
}
.upload-area {
    border: 2px dashed #aaa;
    border-radius: 15px;
    padding: 20px;
    margin: 20px 0;
    background: #fafafa;
    transition: 0.3s;
}
.upload-area:hover { border-color: #0a5e8c; background: #f0f8ff; }
.file-name, .file-list { margin-top: 10px; font-size: 0.9em; color: #2c3e50; }
button {
    background: #0a5e8c;
    color: white;
    border: none;
    padding: 12px 30px;
    font-size: 1.1em;
    border-radius: 40px;
    cursor: pointer;
    transition: 0.2s;
}
button:disabled { background: #95a5a6; cursor: not-allowed; }
button:hover:not(:disabled) { background: #083d5a; transform: translateY(-1px); }
.status {
    margin-top: 25px;
    padding: 15px;
    border-radius: 10px;
    background: #e9ecef;
}
.status.success { background: #d4edda; color: #155724; }
.status.error { background: #f8d7da; color: #721c24; }
.status.loading { background: #fff3cd; color: #856404; }