* { box-sizing: border-box; }

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    max-width: 900px;
    margin: 0 auto;
    padding: 30px;
    background-color: #222;
    color: #eee;
}

.back-arrow {
    position: absolute;
    top: 20px;
    left: 20px;
    color: #8f8f8f;
    font-size: 24px;
    text-decoration: none;
}
.back-arrow:hover { color: #bababa; }

.container {
    background-color: #333;
    border-radius: 8px;
    padding: 25px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.3);
}

h1 {
    color: #d2b48c;
    margin-top: 0;
    margin-bottom: 5px;
}

.subtitle {
    color: #999;
    margin-top: 0;
    margin-bottom: 20px;
    font-size: 14px;
}

.drop-zones {
    display: flex;
    gap: 15px;
}

.file-drop-area {
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    flex: 1;
    height: 120px;
    padding: 10px;
    border: 2px dotted #674331;
    border-radius: 8px;
    background-color: #444;
    transition: all 0.3s ease;
    cursor: pointer;
}
.file-drop-area.optional {
    border-color: #555;
    background-color: #3a3a3a;
}
.file-drop-area:hover, .file-drop-area.drag-over {
    border-color: #d2b48c;
    background-color: #383838;
}
.file-drop-area.loaded {
    border-color: #6a8a5a;
    background-color: #3a4a3a;
}

.file-drop-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    width: 100%;
    height: 100%;
    pointer-events: none;
}

.file-drop-icon {
    font-size: 28px;
    margin-bottom: 10px;
    color: #d2b48c;
}

.file-msg {
    font-size: 14px;
    color: #bbb;
    text-align: center;
}

.file-drop-area input[type="file"] {
    position: absolute;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    opacity: 0;
    cursor: pointer;
}

.file-info {
    margin-top: 15px;
    padding: 12px;
    background: #2a2a2a;
    border-radius: 6px;
    font-family: monospace;
    font-size: 13px;
    line-height: 1.6;
    color: #ccc;
}

.controls {
    margin-top: 15px;
    display: flex;
    align-items: center;
    gap: 20px;
}

.option-group {
    display: flex;
    align-items: center;
    gap: 10px;
}

.option-group > label {
    font-weight: bold;
    color: #aaa;
    font-size: 14px;
}

.radio-group {
    display: flex;
    gap: 15px;
}

.radio-label {
    display: flex;
    align-items: center;
    gap: 5px;
    cursor: pointer;
    font-size: 14px;
    color: #ccc;
}

.radio-label input[type="radio"] {
    accent-color: #d2b48c;
}

.run-btn {
    background-color: #674331;
    color: white;
    border: none;
    padding: 10px 24px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 15px;
    transition: background-color 0.2s;
    margin-left: auto;
}
.run-btn:hover { background-color: #7a5542; }
.run-btn:disabled {
    background-color: #555;
    cursor: not-allowed;
}

.progress-area {
    margin-top: 15px;
}

.progress-bar {
    width: 100%;
    height: 22px;
    background: #444;
    border-radius: 4px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, #674331, #d2b48c);
    width: 0%;
    transition: width 0.2s;
    border-radius: 4px;
}

.progress-text {
    margin-top: 6px;
    font-size: 13px;
    color: #aaa;
}

.log {
    margin-top: 15px;
    padding: 12px;
    background: #1a1a1a;
    border-radius: 6px;
    font-family: monospace;
    font-size: 12px;
    line-height: 1.5;
    color: #8a8;
    max-height: 300px;
    overflow-y: auto;
    white-space: pre-wrap;
}

.hidden { display: none !important; }

footer {
    position: fixed;
    right: 10px;
    bottom: 10px;
    color: #8f8f8f;
    font-size: 0.8em;
}
footer a { color: #989898; text-decoration: none; }

@media screen and (max-width: 600px) {
    body { padding: 15px; }
    .drop-zones { flex-direction: column; }
    .controls { flex-direction: column; align-items: flex-start; }
    .run-btn { margin-left: 0; width: 100%; }
}