* {
    box-sizing: border-box;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: transparent;
    margin: 0;
    padding: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
}

.fuel-ui {
    display: none;
    background: linear-gradient(135deg, rgba(15, 15, 15, 0.95) 0%, rgba(25, 25, 25, 0.95) 100%);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 20px;
    padding: 30px;
    width: 400px;
    color: #fff;
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    overflow: hidden;
    animation: popIn 0.8s cubic-bezier(0.68, -0.55, 0.265, 1.55) forwards;
}

.fuel-logo {
    position: absolute;
    top: 10px;
    right: 20px;
    width: 60px;
    height: 60px;
    background-image: url('https://i.postimg.cc/hjwFMy1p/test.png'); 
    background-size: contain;
    background-repeat: no-repeat;
    background-position: center;
}


@keyframes popIn {
    0% {
        opacity: 0;
        transform: translate(-50%, -50%) scale(0.3) rotateY(-15deg);
    }
    50% {
        opacity: 0.8;
        transform: translate(-50%, -50%) scale(1.1) rotateY(0deg);
    }
    100% {
        opacity: 1;
        transform: translate(-50%, -50%) scale(1) rotateY(0deg);
    }
}


.fuel-ui::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(195, 255, 0, 0.6), transparent);
}

.fuel-ui h1 {
    color: #c3ff00;
    font-size: 24px;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 12px;
    margin: 0 0 30px 0;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.fuel-ui h1 i {
    font-size: 28px;
    filter: drop-shadow(0 0 10px rgba(195, 255, 0, 0.3));
}

.fuel-level-box {
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.05) 0%, rgba(255, 255, 255, 0.02) 100%);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 16px;
    padding: 20px;
    margin-bottom: 25px;
    position: relative;
    overflow: hidden;
}

.fuel-level-box::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(195, 255, 0, 0.3), transparent);
}

.fuel-label {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
}

.fuel-label p {
    margin: 0;
    font-size: 14px;
    color: #a0a0a0;
    font-weight: 500;
}

#fuel-litres {
    color: #c3ff00;
    font-weight: 700;
    font-size: 16px;
    text-shadow: 0 0 10px rgba(195, 255, 0, 0.3);
}

.fuel-bar {
    background: rgba(255, 255, 255, 0.1);
    border-radius: 8px;
    height: 12px;
    position: relative;
    overflow: hidden;
}

#fuel-bar-fill {
    background: linear-gradient(90deg, #c3ff00, #a8e600);
    height: 100%;
    border-radius: 8px;
    position: relative;
    box-shadow: 0 0 20px rgba(195, 255, 0, 0.4);
    transition: all 0.3s ease;
}

#fuel-bar-fill::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
    animation: shimmer 2s infinite;
}

@keyframes shimmer {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(100%); }
}

.payment-methods, .fuel-amount {
    margin-bottom: 25px;
}

.payment-methods p, .fuel-amount p {
    margin: 0 0 12px 0;
    font-weight: 600;
    font-size: 16px;
    color: #ffffff;
}

.options {
    display: flex;
    gap: 12px;
}

.option {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    padding: 16px;
    border-radius: 12px;
    flex: 1;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    font-weight: 500;
    position: relative;
    overflow: hidden;
}

.option::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(195, 255, 0, 0.1), transparent);
    transition: left 0.5s ease;
}

.option:hover::before {
    left: 100%;
}

.option:hover {
    background: rgba(255, 255, 255, 0.08);
    border-color: rgba(195, 255, 0, 0.3);
    transform: translateY(-2px);
}

.option i {
    color: #c3ff00;
    margin-right: 8px;
    font-size: 18px;
}

.option.active {
    background: linear-gradient(135deg, rgba(195, 255, 0, 0.15), rgba(195, 255, 0, 0.05));
    border-color: rgba(195, 255, 0, 0.4);
    color: #c3ff00;
    box-shadow: 0 0 20px rgba(195, 255, 0, 0.2);
}

.input-group {
    display: flex;
    gap: 12px;
    margin-bottom: 12px;
}

.input-group input {
    flex: 1;
    padding: 16px;
    border-radius: 12px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    outline: none;
    background: rgba(255, 255, 255, 0.05);
    color: #ffffff;
    font-weight: 500;
    font-size: 16px;
    font-family: 'Inter', sans-serif;
    transition: all 0.3s ease;
}

.input-group input:focus {
    border-color: rgba(195, 255, 0, 0.5);
    background: rgba(255, 255, 255, 0.08);
    box-shadow: 0 0 0 3px rgba(195, 255, 0, 0.1);
}

.input-group input::placeholder {
    color: #666;
}

#full-tank {
    background: linear-gradient(135deg, #c3ff00, #a8e600);
    border: none;
    padding: 16px 20px;
    border-radius: 12px;
    cursor: pointer;
    color: #000;
    font-weight: 700;
    font-size: 14px;
    transition: all 0.3s ease;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    box-shadow: 0 4px 15px rgba(195, 255, 0, 0.3);
}

#full-tank:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 25px rgba(195, 255, 0, 0.4);
}

#full-tank:active {
    transform: translateY(0);
}

.fuel-amount small {
    display: block;
    margin-top: 8px;
    color: #888;
    font-size: 12px;
    line-height: 1.4;
    font-weight: 400;
}

#refuel-btn {
    width: 100%;
    padding: 18px;
    border: none;
    background: linear-gradient(135deg, #c3ff00, #a8e600);
    color: #000;
    border-radius: 16px;
    font-size: 18px;
    font-weight: 700;
    cursor: pointer;
    margin-top: 30px;
    transition: all 0.3s ease;
    text-transform: uppercase;
    letter-spacing: 1px;
    box-shadow: 0 8px 30px rgba(195, 255, 0, 0.3);
    position: relative;
    overflow: hidden;
}

#refuel-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
    transition: left 0.5s ease;
}

#refuel-btn:hover::before {
    left: 100%;
}

#refuel-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 12px 40px rgba(195, 255, 0, 0.4);
}

#refuel-btn:active {
    transform: translateY(-1px);
}

@media (max-width: 480px) {
    .fuel-ui {
        width: 350px;
        padding: 25px;
    }
    
    .fuel-ui h1 {
        font-size: 20px;
    }
    
    .options {
        flex-direction: column;
        gap: 8px;
    }
    
    .input-group {
        flex-direction: column;
        gap: 8px;
    }
}