body {
    font-family: 'Segoe UI', sans-serif;
    margin: 0;
    padding: 0;
    background: #f4f6f8;
    color: #333;
}

header {
    display: flex;
    align-items: center;
    justify-content: center;
    background: #007bff;
    color: white;
    padding: 15px;
    text-align: center;
}

.container {
    max-width: 1000px;
    margin: 20px auto;
    padding: 20px;
    background: white;
    border-radius: 12px;
    box-shadow: 0 4px 10px rgba(0,0,0,0.1);
    display: flex;
    flex-wrap: wrap;
    justify-content: space-around;
    align-items: flex-start;
}

.left-panel, .right-panel {
    flex: 1 1 400px;
    margin: 10px;
}

button {
    background: #007bff;
    color: white;
    border: none;
    padding: 10px 20px;
    margin-top: 10px;
    border-radius: 8px;
    cursor: pointer;
    transition: 0.3s;
}

button:hover {
    background: #0056b3;
}

.bin-container {
    position: relative;
    width: 150px;
    height: 200px;
    margin: 30px auto;
}

.bin-body {
    position: absolute;
    bottom: 0;
    width: 100%;
    height: 150px;
    background: #999;
    border-radius: 0 0 12px 12px;
    border: 2px solid #555;
}

.bin-lid {
    position: absolute;
    top: 0;
    width: 100%;
    height: 30px;
    background: #555;
    border-radius: 6px 6px 0 0;
    transform-origin: top center;
    transition: transform 0.5s;
}

.bin-lid.open {
    transform: rotateX(-70deg);
}

.conveyor {
    position: absolute;
    bottom: -20px;
    width: 100%;
    height: 20px;
    background: #444;
    border-radius: 4px;
    overflow: hidden;
}

.waste {
    position: absolute;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    top: -20px;
    left: 65px;
    transition: top 1s, left 1s;
}

.waste-metal { background: orange; }
.waste-plastic { background: #00bfff; }
.waste-paper { background: #28a745; }

.progress-bar {
    width: 100%;
    background: #ddd;
    border-radius: 8px;
    overflow: hidden;
    margin-top: 10px;
}

.progress {
    height: 20px;
    background: #28a745;
    width: 0%;
    text-align: center;
    color: white;
    line-height: 20px;
}
/* ===== Rewards/Gifts Section ===== */
.reward-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    justify-content: center;
    margin-top: 20px;
}

.reward-card {
    background: #f9f9f9;
    padding: 15px;
    border-radius: 12px;
    text-align: center;
    width: 150px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    transition: transform 0.3s, box-shadow 0.3s;
}

.reward-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 12px rgba(0,0,0,0.2);
}

.reward-card img {
    width: 80px;
    height: 80px;
    object-fit: contain;
}

.reward-card p {
    font-weight: bold;
    margin-top: 10px;
    margin-bottom: 10px;
}

.redeem-btn {
    padding: 5px 10px;
    border-radius: 6px;
    cursor: pointer;
    background: #007bff;
    color: white;
    border: none;
    transition: 0.3s;
}

.redeem-btn:hover:enabled {
    background: #0056b3;
}

.redeem-btn:disabled {
    background: #aaa;
    cursor: not-allowed;
}