body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #1a1a1a;
    color: #e0e0e0;
    min-height: 100vh;
}

.container {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.content {
    flex: 1;
    padding: 20px;
}

.cards-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 30px;
}

.card {
    background: #2a2a2a;
    border-radius: 12px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.2);
    overflow: hidden;
    padding: 24px;
}

.card-header {
    display: flex;
    align-items: center;
    margin-bottom: 20px;
    gap: 12px;
    flex-wrap: wrap;
}

.card-header h1, .card-header h2 {
    margin: 0;
    color: #ffffff;
}

.card-header h1 {
    font-size: 24px;
}

.card-header h2 {
    font-size: 20px;
}

.resolution, .grid-info {
    color: #b0b0b0;
    font-size: 16px;
}

.card-content {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.control-row {
    display: flex;
    align-items: center;
    gap: 16px;
    flex-wrap: wrap;
    justify-content: center;
}

.control-row label {
    min-width: auto;
    font-size: 14px;
}

.upload-label {
    background-color: #404040;
    color: white;
    padding: 12px 24px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 16px;
    transition: background-color 0.3s;
    text-align: center;
}

.upload-label:hover {
    background-color: #505050;
}

.retry-btn {
    background-color: #404040;
    color: white;
    padding: 12px 24px;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 16px;
    transition: background-color 0.3s;
}

.retry-btn:hover:not(:disabled) {
    background-color: #505050;
}

.retry-btn:disabled {
    background-color: #303030;
    cursor: not-allowed;
    color: #808080;
}

#upload {
    display: none;
}

#block-range {
    flex: 1;
    max-width: 300px;
    height: 6px;
    -webkit-appearance: none;
    -moz-appearance: none;
    appearance: none;
    background: #404040;
    border-radius: 3px;
    outline: none;
    margin: 15px 0;
    position: relative;
}

#block-range::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 0;
    right: 18px;
    height: 2px;
    background: #404040;
    transform: translateY(-50%);
    pointer-events: none;
}

#block-range::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 18px;
    height: 100%;
    background-image: radial-gradient(circle, #505050 3px, transparent 3px);
    background-size: 11.11% 6px;
    background-position-x: 0;
    background-position-y: center;
    background-repeat: space no-repeat;
    pointer-events: none;
}

#block-range::-webkit-slider-thumb {
    -webkit-appearance: none;
    -moz-appearance: none;
    appearance: none;
    width: 18px;
    height: 18px;
    background: #808080;
    border-radius: 50%;
    cursor: pointer;
    transition: background 0.3s;
    box-shadow: 0 0 0 2px #2a2a2a;
    position: relative;
    z-index: 1;
}

#block-range::-webkit-slider-thumb:hover {
    background: #909090;
}

#block-range:disabled {
    opacity: 0.5;
}

#block-range:disabled::-webkit-slider-thumb {
    background: #505050;
    cursor: not-allowed;
}

.img-wrapper {
    width: 100%;
    max-height: 600px;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow: hidden;
}

.img-wrapper img {
    max-width: 100%;
    max-height: 600px;
    object-fit: contain;
}

.download-btn {
    background-color: #404040;
    color: white;
    padding: 12px 24px;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 16px;
    transition: background-color 0.3s;
    align-self: center;
}

.download-btn:hover {
    background-color: #505050;
}

.canvas-wrapper {
    position: relative;
    margin: 5px;
}

canvas {
    border: 2px solid #2a2a2a;
    border-radius: 4px;
    image-rendering: pixelated;
}

.canvas-info {
    position: absolute;
    top: 10px;
    left: 10px;
    background-color: rgba(0, 0, 0, 0.7);
    color: white;
    padding: 5px 10px;
    border-radius: 4px;
    font-size: 12px;
}

button {
    padding: 10px 20px;
    margin: 0 10px;
    font-size: 16px;
    cursor: pointer;
    background-color: #404040;
    color: white;
    border: none;
    border-radius: 5px;
    transition: background-color 0.3s;
}

button:hover {
    background-color: #505050;
}

button:disabled {
    background-color: #303030;
    cursor: not-allowed;
}

.sample-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    background-color: #2a2a2a;
    padding: 10px;
    border-radius: 8px;
}

.sample-container p {
    margin: 5px 0;
    font-weight: bold;
    color: #ffffff;
}

.footer {
    background-color: #2a2a2a;
    padding: 20px;
    text-align: center;
    margin-top: auto;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
}

.footer a {
    color: #e0e0e0;
    text-decoration: none;
    transition: color 0.3s;
}

.footer a:hover {
    color: #ffffff;
}

.separator {
    color: #505050;
}

@media (max-width: 768px) {
    .content {
        padding: 10px;
    }

    .card {
        padding: 16px;
    }

    .card-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 8px;
    }

    .control-row {
        flex-direction: column;
        align-items: stretch;
        gap: 12px;
        width: 100%;
        padding: 0 8px;
    }

    #block-range {
        max-width: none;
        width: 100%;
    }

    .footer-content {
        flex-direction: column;
        gap: 8px;
    }

    .separator {
        display: none;
    }
}